/*
This file is part of GNUnet.
- (C) 2007, 2008, 2009 Christian Grothoff (and other contributing authors)
+ (C) 2007, 2008, 2009, 2010 Christian Grothoff (and other contributing authors)
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
/**
* @file topology/gnunet-daemon-topology.c
- * @brief code for bootstrapping via topology servers
+ * @brief code for maintaining the mesh topology
* @author Christian Grothoff
*/
#include <stdlib.h>
#include "platform.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
+#define DEBUG_TOPOLOGY GNUNET_YES
/**
- * For how long do we blacklist a peer after a failed
- * connection attempt?
+ * For how long do we blacklist a peer after a failed connection
+ * attempt?
*/
-#define BLACKLIST_AFTER_ATTEMPT GNUNET_TIME_UNIT_HOURS
+#define GREYLIST_AFTER_ATTEMPT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 15)
/**
- * For how long do we blacklist a friend after a failed
- * connection attempt?
+ * 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)
+#define GREYLIST_AFTER_ATTEMPT_FRIEND GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 2)
/**
- * How frequently are we allowed to ask PEERINFO for more
- * HELLO's to advertise (at most)?
+ * For how long do we blacklist anyone under any cirumstances after a failed connection
+ * attempt?
*/
-#define MIN_HELLO_GATHER_DELAY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 27)
+#define GREYLIST_AFTER_ATTEMPT_MIN GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 15)
+
+/**
+ * For how long do we blacklist anyone under any cirumstances after a failed connection
+ * attempt?
+ */
+#define GREYLIST_AFTER_ATTEMPT_MAX GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_HOURS, 1)
+
+/**
+ * How often do we at most advertise any HELLO to a peer?
+ */
+#define HELLO_ADVERTISEMENT_MIN_FREQUENCY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_HOURS, 4)
/**
* 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.
*/
-#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
{
+ /**
+ * Which peer is this entry about?
+ */
+ struct GNUNET_PeerIdentity pid;
/**
- * This is a linked list.
+ * Our handle for the request to transmit HELLOs to this peer; NULL
+ * if no such request is pending.
*/
- struct PeerList *next;
+ struct GNUNET_CORE_TransmitHandle *hello_req;
/**
- * Is this peer listed here because he is a friend?
+ * Our handle for the request to connect to this peer; NULL if no
+ * such request is pending.
*/
- int is_friend;
+ struct GNUNET_CORE_PeerRequestHandle *connect_req;
/**
- * 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;
+
+ /**
+ * Bloom filter used to mark which peers already got the HELLO
+ * from this peer.
+ */
+ struct GNUNET_CONTAINER_BloomFilter *filter;
/**
* Until what time should we not try to connect again
* to this peer?
*/
- struct GNUNET_TIME_Absolute blacklisted_until;
+ struct GNUNET_TIME_Absolute greylisted_until;
/**
- * 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;
+ GNUNET_SCHEDULER_TaskIdentifier hello_delay_task;
/**
- * Pointer to the HELLO message. Memory allocated as part
- * of the "struct HelloList" --- do not free!
+ * ID of task we use to clear peers from the greylist.
*/
- struct GNUNET_HELLO_Message *msg;
+ GNUNET_SCHEDULER_TaskIdentifier greylist_clean_task;
/**
- * Bloom filter used to mark which peers already got
- * this HELLO.
+ * How often have we tried so far?
*/
- struct GNUNET_CONTAINER_BloomFilter *filter;
+ unsigned int connect_attempts;
/**
- * 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)?
+ * Are we connected to this peer right now?
*/
- struct GNUNET_TIME_Absolute expiration;
-};
+ int is_connected;
+};
-/**
- * Linked list of HELLOs for advertising.
- */
-static struct HelloList *hellos;
/**
- * Our scheduler.
+ * Our peerinfo notification context. We use notification
+ * to instantly learn about new peers as they are discovered.
*/
-static struct GNUNET_SCHEDULER_Handle * sched;
+static struct GNUNET_PEERINFO_NotifyContext *peerinfo_notify;
/**
* Our configuration.
*/
-static struct GNUNET_CONFIGURATION_Handle * cfg;
+static const struct GNUNET_CONFIGURATION_Handle *cfg;
/**
* Handle to the core API.
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 GNUNET_CONTAINER_MultiHashMap *peers;
+
+/**
+ * Handle for reporting statistics.
*/
-static struct PeerList *friends;
+static struct GNUNET_STATISTICS_Handle *stats;
/**
- * Timestamp from the last time we tried to gather HELLOs.
+ * Blacklist (NULL if we have none).
*/
-static struct GNUNET_TIME_Absolute last_hello_gather_time;
+static struct GNUNET_TRANSPORT_Blacklist *blacklist;
+
+/**
+ * Task scheduled to try to add peers.
+ */
+static GNUNET_SCHEDULER_TaskIdentifier add_task;
/**
* Flag to disallow non-friend connections (pure F2F mode).
*/
static int autoconnect;
-/**
- * Are we currently having a request pending with
- * PEERINFO asking for HELLOs for advertising?
- */
-static int hello_gathering_active;
-
-
/**
- * Force a disconnect from the specified peer.
+ * 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 disapproave
+ * @return GNUNET_OK if the connection is allowed
*/
-static void
-force_disconnect (const struct GNUNET_PeerIdentity *peer)
+static int
+blacklist_check (void *cls, const struct GNUNET_PeerIdentity *pid)
{
- GNUNET_CORE_peer_configure (handle,
- peer,
- GNUNET_TIME_UNIT_FOREVER_REL,
- 0,
- 0,
- 0,
- NULL,
- NULL);
-}
-
+ struct Peer *pos;
-/**
- * Function called by core when our attempt to connect
- * succeeded. Does nothing.
- */
-static size_t
-ready_callback (void *cls,
- size_t size, void *buf)
-{
- return 0;
+ pos = GNUNET_CONTAINER_multihashmap_get (peers, &pid->hashPubKey);
+ if ((pos != NULL) && (pos->is_friend == GNUNET_YES))
+ return GNUNET_OK;
+ GNUNET_STATISTICS_update (stats, gettext_noop ("# peers blacklisted"), 1,
+ GNUNET_NO);
+ return GNUNET_SYSERR;
}
/**
- * Try to connect to the specified peer.
- *
- * @param pos NULL if not in friend list yet
+ * Whitelist all peers that we blacklisted; we've passed
+ * the minimum number of friends.
*/
static void
-attempt_connect (const struct GNUNET_PeerIdentity *peer,
- struct PeerList *pos)
+whitelist_peers ()
{
- 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);
- 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);
+ if (blacklist != NULL)
+ {
+ GNUNET_TRANSPORT_blacklist_cancel (blacklist);
+ blacklist = NULL;
+ }
}
/**
- * Is this peer one of our friends?
+ * Function called by core when our request to connect was transmitted.
+ *
+ * @param cls the 'struct Peer' for which we issued the connect request
+ * @param success was the request transmitted
*/
-static int
-is_friend (const struct GNUNET_PeerIdentity * peer)
+static void
+connect_completed_callback (void *cls, int success)
{
- struct PeerList *pos;
+ struct Peer *pos = cls;
- 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;
+ pos->connect_req = NULL;
}
/**
* Check if an additional connection from the given peer is allowed.
+ *
+ * @param peer connection to check
+ * @return GNUNET_OK if the connection is allowed
*/
static int
-is_connection_allowed (const struct GNUNET_PeerIdentity * peer)
+is_connection_allowed (struct Peer *peer)
{
- if (0 == memcmp (&my_identity, peer, sizeof (struct GNUNET_PeerIdentity)))
+ if (0 ==
+ memcmp (&my_identity, &peer->pid, sizeof (struct GNUNET_PeerIdentity)))
return GNUNET_SYSERR; /* disallow connections to self */
- if (is_friend (peer))
+ if (peer->is_friend)
return GNUNET_OK;
if (GNUNET_YES == friends_only)
+ {
+#if DEBUG_TOPOLOGY
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Determined that `%s' is not allowed to connect (not a friend)\n",
+ GNUNET_i2s (&peer->pid));
+#endif
return GNUNET_SYSERR;
+ }
if (friend_count >= minimum_friend_count)
return GNUNET_OK;
+#if DEBUG_TOPOLOGY
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Determined that `%s' is not allowed to connect (not enough connected friends)\n",
+ GNUNET_i2s (&peer->pid));
+#endif
return GNUNET_SYSERR;
}
/**
- * Method called whenever a peer connects.
+ * Free all resources associated with the given peer.
*
- * @param cls closure
- * @param peer peer identity this notification is about
+ * @param cls closure (not used)
+ * @param pid identity of the peer
+ * @param value peer to free
+ * @return GNUNET_YES (always: continue to iterate)
*/
-static void connect_notify (void *cls,
- const struct
- GNUNET_PeerIdentity * peer)
+static int
+free_peer (void *cls, const GNUNET_HashCode * 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 Peer *pos = value;
+
+ GNUNET_break (GNUNET_OK ==
+ GNUNET_CONTAINER_multihashmap_remove (peers, pid, pos));
+ if (pos->hello_req != NULL)
+ GNUNET_CORE_notify_transmit_ready_cancel (pos->hello_req);
+ if (pos->connect_req != NULL)
+ GNUNET_CORE_peer_request_connect_cancel (pos->connect_req);
+ if (pos->hello_delay_task != GNUNET_SCHEDULER_NO_TASK)
+ GNUNET_SCHEDULER_cancel (pos->hello_delay_task);
+ if (pos->greylist_clean_task != GNUNET_SCHEDULER_NO_TASK)
+ GNUNET_SCHEDULER_cancel (pos->greylist_clean_task);
+ GNUNET_free_non_null (pos->hello);
+ if (pos->filter != NULL)
+ GNUNET_CONTAINER_bloomfilter_free (pos->filter);
+ GNUNET_free (pos);
+ return GNUNET_YES;
}
/**
- * Disconnect from all non-friends (we're below quota).
+ * Discard peer entries for greylisted peers
+ * where the greylisting has expired.
+ *
+ * @param cls 'struct Peer' to greylist
+ * @param tc scheduler context
+ */
+static void
+remove_from_greylist (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc);
+
+
+/**
+ * Try to connect to the specified peer.
+ *
+ * @param pos peer to connect to
*/
static void
-drop_non_friends ()
+attempt_connect (struct Peer *pos)
{
- struct PeerList *pos;
+ struct GNUNET_TIME_Relative rem;
- 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;
- }
+ if ((connection_count >= target_connection_count) &&
+ (friend_count >= minimum_friend_count))
+ return;
+ if (GNUNET_YES == pos->is_connected)
+ return;
+ if (GNUNET_OK != is_connection_allowed (pos))
+ return;
+ if (GNUNET_TIME_absolute_get_remaining (pos->greylisted_until).rel_value > 0)
+ return;
+ if (GNUNET_YES == pos->is_friend)
+ rem = GREYLIST_AFTER_ATTEMPT_FRIEND;
+ else
+ rem = GREYLIST_AFTER_ATTEMPT;
+ rem = GNUNET_TIME_relative_multiply (rem, connection_count);
+ rem = GNUNET_TIME_relative_divide (rem, target_connection_count);
+ if (pos->connect_attempts > 30)
+ pos->connect_attempts = 30;
+ rem = GNUNET_TIME_relative_multiply (rem, 1 << (++pos->connect_attempts));
+ rem = GNUNET_TIME_relative_max (rem, GREYLIST_AFTER_ATTEMPT_MIN);
+ rem = GNUNET_TIME_relative_min (rem, GREYLIST_AFTER_ATTEMPT_MAX);
+ pos->greylisted_until = GNUNET_TIME_relative_to_absolute (rem);
+ if (pos->greylist_clean_task != GNUNET_SCHEDULER_NO_TASK)
+ GNUNET_SCHEDULER_cancel (pos->greylist_clean_task);
+ pos->greylist_clean_task =
+ GNUNET_SCHEDULER_add_delayed (rem, &remove_from_greylist, pos);
+#if DEBUG_TOPOLOGY
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Asking to connect to `%s'\n",
+ GNUNET_i2s (&pos->pid));
+#endif
+ GNUNET_STATISTICS_update (stats,
+ gettext_noop ("# connect requests issued to core"),
+ 1, GNUNET_NO);
+ pos->connect_req =
+ GNUNET_CORE_peer_request_connect (handle, &pos->pid,
+ &connect_completed_callback, pos);
}
/**
- * Method called whenever a peer disconnects.
+ * Discard peer entries for greylisted peers
+ * where the greylisting has expired.
*
- * @param cls closure
- * @param peer peer identity this notification is about
+ * @param cls 'struct Peer' to greylist
+ * @param tc scheduler context
+ */
+static void
+remove_from_greylist (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+ struct Peer *pos = cls;
+ struct GNUNET_TIME_Relative rem;
+
+ pos->greylist_clean_task = GNUNET_SCHEDULER_NO_TASK;
+ rem = GNUNET_TIME_absolute_get_remaining (pos->greylisted_until);
+ if (rem.rel_value == 0)
+ {
+ attempt_connect (pos);
+ }
+ else
+ {
+ pos->greylist_clean_task =
+ GNUNET_SCHEDULER_add_delayed (rem, &remove_from_greylist, pos);
+ }
+ if ((GNUNET_NO == pos->is_friend) && (GNUNET_NO == pos->is_connected) &&
+ (NULL == pos->hello))
+ {
+ free_peer (NULL, &pos->pid.hashPubKey, pos);
+ return;
+ }
+}
+
+
+/**
+ * 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 void disconnect_notify (void *cls,
- 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;
- struct PeerList *prev;
+ struct Peer *ret;
- 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);
+ ret = GNUNET_malloc (sizeof (struct Peer));
+ ret->pid = *peer;
+ ret->is_friend = is_friend;
+ if (hello != NULL)
+ {
+ ret->hello = GNUNET_malloc (GNUNET_HELLO_size (hello));
+ memcpy (ret->hello, hello, GNUNET_HELLO_size (hello));
+ }
+ GNUNET_break (GNUNET_OK ==
+ GNUNET_CONTAINER_multihashmap_put (peers, &peer->hashPubKey,
+ ret,
+ GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
+ return ret;
}
/**
- * Find more peers that we should connect to and ask the
- * core to establish connections.
+ * Setup bloom filter for the given peer entry.
+ *
+ * @param peer entry to initialize
*/
static void
-find_more_peers (void *cls,
- const struct GNUNET_SCHEDULER_TaskContext *tc);
+setup_filter (struct Peer *peer)
+{
+ /* 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_CONTAINER_bloomfilter_add (peer->filter, &peer->pid.hashPubKey);
+}
+
+
+/**
+ * Function to fill send buffer with HELLO.
+ *
+ * @param cls 'struct Peer' of the target peer
+ * @param size number of bytes available in buf
+ * @param buf where the callee should write the message
+ * @return number of bytes written to buf
+ */
+static size_t
+hello_advertising_ready (void *cls, size_t size, void *buf);
/**
- * Determine when we should try again to find more peers and
- * schedule the task.
+ * Closure for 'find_advertisable_hello'.
*/
-static void
-schedule_peer_search ()
+struct FindAdvHelloContext
{
- struct GNUNET_TIME_Relative delay;
- /* 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_PREREQUISITE_TASK,
- delay,
- &find_more_peers,
- NULL);
+ /**
+ * 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 pid identity of a peer
+ * @param value 'struct Peer*' for the peer we are considering
+ * @return GNUNET_YES (continue iteration)
+ */
+static int
+find_advertisable_hello (void *cls, const GNUNET_HashCode * pid, void *value)
+{
+ struct FindAdvHelloContext *fah = cls;
+ struct Peer *pos = value;
+ struct GNUNET_TIME_Relative rst_time;
+ 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)
+ {
+ /* 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;
+ if (GNUNET_NO ==
+ GNUNET_CONTAINER_bloomfilter_test (pos->filter,
+ &fah->peer->pid.hashPubKey))
+ fah->result = pos;
+ return GNUNET_YES;
}
+/**
+ * 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
+ * @param tc task context
+ */
+static void
+schedule_next_hello (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+ struct Peer *pl = cls;
+ struct FindAdvHelloContext fah;
+ size_t next_want;
+ struct GNUNET_TIME_Relative delay;
+
+ pl->hello_delay_task = GNUNET_SCHEDULER_NO_TASK;
+ GNUNET_assert (GNUNET_YES == pl->is_connected);
+ if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
+ return; /* we're out of here */
+ if (pl->hello_req != NULL)
+ return; /* did not finish sending the previous one */
+ /* 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_multihashmap_iterate (peers, &find_advertisable_hello, &fah);
+ pl->hello_delay_task =
+ GNUNET_SCHEDULER_add_delayed (fah.next_adv, &schedule_next_hello, pl);
+ if (fah.result == NULL)
+ return;
+ next_want = GNUNET_HELLO_size (fah.result->hello);
+ delay = GNUNET_TIME_absolute_get_remaining (pl->next_hello_allowed);
+ if (delay.rel_value == 0)
+ {
+ /* now! */
+ pl->hello_req =
+ GNUNET_CORE_notify_transmit_ready (handle, GNUNET_YES, 0,
+ GNUNET_CONSTANTS_SERVICE_TIMEOUT,
+ &pl->pid, next_want,
+ &hello_advertising_ready, pl);
+ }
+}
/**
- * Iterator called on each address.
+ * 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 flag that we will set if we see any addresses.
+ * @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
-address_iterator (void *cls,
- const char *tname,
- struct GNUNET_TIME_Absolute expiration,
- const void *addr, size_t addrlen)
+reschedule_hellos (void *cls, const GNUNET_HashCode * pid, void *value)
{
- int *flag = cls;
- *flag = GNUNET_YES;
- return GNUNET_SYSERR;
+ struct Peer *peer = value;
+ struct Peer *skip = cls;
+
+ if (skip == peer)
+ return GNUNET_YES;
+ if (!peer->is_connected)
+ return GNUNET_YES;
+ if (peer->hello_req != NULL)
+ {
+ GNUNET_CORE_notify_transmit_ready_cancel (peer->hello_req);
+ peer->hello_req = NULL;
+ }
+ if (peer->hello_delay_task != GNUNET_SCHEDULER_NO_TASK)
+ {
+ GNUNET_SCHEDULER_cancel (peer->hello_delay_task);
+ peer->hello_delay_task = GNUNET_SCHEDULER_NO_TASK;
+ }
+ peer->hello_delay_task =
+ GNUNET_SCHEDULER_add_now (&schedule_next_hello, peer);
+ return GNUNET_YES;
}
/**
- * We've gotten a HELLO from another peer.
- * Consider it for advertising.
+ * Method called whenever a peer connects.
+ *
+ * @param cls closure
+ * @param peer peer identity this notification is about
+ * @param atsi performance data
*/
static void
-consider_for_advertising (const struct GNUNET_HELLO_Message *hello)
+connect_notify (void *cls, const struct GNUNET_PeerIdentity *peer,
+ const struct GNUNET_TRANSPORT_ATS_Information *atsi)
{
- int have_address;
- struct GNUNET_PeerIdentity pid;
- struct HelloList *pos;
- uint16_t size;
+ struct Peer *pos;
- have_address = GNUNET_NO;
- GNUNET_HELLO_iterate_addresses (hello,
- GNUNET_NO,
- &address_iterator,
- &have_address);
- if (GNUNET_NO == have_address)
- return; /* no point in advertising this one... */
- 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;
+#if DEBUG_TOPOLOGY
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Core told us that we are connecting to `%s'\n",
+ GNUNET_i2s (peer));
+#endif
+ if (0 == memcmp (&my_identity, peer, sizeof (struct GNUNET_PeerIdentity)))
+ return;
+
+ connection_count++;
+ GNUNET_STATISTICS_set (stats, gettext_noop ("# peers connected"),
+ connection_count, GNUNET_NO);
+ pos = GNUNET_CONTAINER_multihashmap_get (peers, &peer->hashPubKey);
+ if (pos == NULL)
+ {
+ pos = make_peer (peer, NULL, GNUNET_NO);
+ GNUNET_break (GNUNET_OK == is_connection_allowed (pos));
+ }
+ else
+ {
+ GNUNET_assert (GNUNET_NO == pos->is_connected);
+ pos->greylisted_until.abs_value = 0; /* remove greylisting */
+ }
+ pos->is_connected = GNUNET_YES;
+ pos->connect_attempts = 0; /* re-set back-off factor */
+ if (pos->is_friend)
+ {
+ if ((friend_count == minimum_friend_count - 1) &&
+ (GNUNET_YES != friends_only))
+ whitelist_peers ();
+ friend_count++;
+ GNUNET_STATISTICS_set (stats, gettext_noop ("# friends connected"),
+ friend_count, GNUNET_NO);
+ }
+ reschedule_hellos (NULL, &peer->hashPubKey, pos);
+}
+
+
+/**
+ * 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 int
+try_add_peers (void *cls, const GNUNET_HashCode * pid, void *value)
+{
+ struct Peer *pos = value;
+
+ attempt_connect (pos);
+ return GNUNET_YES;
}
/**
- * Peerinfo calls this function to let us know about a
- * possible peer that we might want to connect to.
+ * Last task run during shutdown. Disconnects us from
+ * the transport and core.
+ *
+ * @param cls unused, NULL
+ * @param tc scheduler context
*/
static void
-process_peer (void *cls,
- const struct GNUNET_PeerIdentity *peer,
- const struct GNUNET_HELLO_Message *hello,
- uint32_t trust)
+add_peer_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
{
- struct PeerList *pos;
+ add_task = GNUNET_SCHEDULER_NO_TASK;
- 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;
- }
- if (0 == memcmp (&my_identity,
- peer, sizeof (struct GNUNET_PeerIdentity)))
- return; /* that's me! */
+ GNUNET_CONTAINER_multihashmap_iterate (peers, &try_add_peers, NULL);
+}
- consider_for_advertising (hello);
- pos = friends;
- while (pos != NULL)
- {
- 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;
- }
- if (GNUNET_YES == friends_only)
+/**
+ * Method called whenever a peer disconnects.
+ *
+ * @param cls closure
+ * @param peer peer identity this notification is about
+ */
+static void
+disconnect_notify (void *cls, const struct GNUNET_PeerIdentity *peer)
+{
+ struct Peer *pos;
+
+ if (0 == memcmp (&my_identity, peer, sizeof (struct GNUNET_PeerIdentity)))
+ return;
+#if DEBUG_TOPOLOGY
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Core told us that we disconnected from `%s'\n",
+ GNUNET_i2s (peer));
+#endif
+ pos = GNUNET_CONTAINER_multihashmap_get (peers, &peer->hashPubKey);
+ if (pos == NULL)
+ {
+ GNUNET_break (0);
return;
- if (friend_count < minimum_friend_count)
+ }
+ if (pos->is_connected != GNUNET_YES)
+ {
+ GNUNET_break (0);
return;
- attempt_connect (peer, NULL);
+ }
+ pos->is_connected = GNUNET_NO;
+ connection_count--;
+ if (NULL != pos->hello_req)
+ {
+ GNUNET_CORE_notify_transmit_ready_cancel (pos->hello_req);
+ pos->hello_req = NULL;
+ }
+ if (GNUNET_SCHEDULER_NO_TASK != pos->hello_delay_task)
+ {
+ GNUNET_SCHEDULER_cancel (pos->hello_delay_task);
+ pos->hello_delay_task = GNUNET_SCHEDULER_NO_TASK;
+ }
+ 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)) &&
+ (GNUNET_SCHEDULER_NO_TASK == add_task))
+ add_task = GNUNET_SCHEDULER_add_now (&add_peer_task, NULL);
+ if ((friend_count < minimum_friend_count) && (blacklist == NULL))
+ blacklist = GNUNET_TRANSPORT_blacklist (cfg, &blacklist_check, NULL);
}
/**
- * Try to add more friends to our connection set.
+ * Iterator called on each address.
+ *
+ * @param cls flag that we will set if we see any addresses
+ * @param tname name of the transport
+ * @param expiration when will the given address expire
+ * @param addr the address of the peer
+ * @param addrlen number of bytes in addr
+ * @return GNUNET_SYSERR always, to terminate iteration
*/
-static void
-try_add_friends ()
+static int
+address_iterator (void *cls, const char *tname,
+ struct GNUNET_TIME_Absolute expiration, const void *addr,
+ uint16_t addrlen)
{
- struct PeerList *pos;
+ int *flag = cls;
- 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;
- }
+ *flag = GNUNET_YES;
+ return GNUNET_SYSERR;
}
/**
- * Discard peer entries for blacklisted peers
- * where the blacklisting has expired.
+ * We've gotten a HELLO from another peer. Consider it for
+ * advertising.
+ *
+ * @param hello the HELLO we got
*/
static void
-discard_old_blacklist_entries ()
+consider_for_advertising (const struct GNUNET_HELLO_Message *hello)
{
- struct PeerList *pos;
- struct PeerList *next;
- struct PeerList *prev;
+ int have_address;
+ struct GNUNET_PeerIdentity pid;
+ struct GNUNET_TIME_Absolute dt;
+ struct GNUNET_HELLO_Message *nh;
+ struct Peer *peer;
+ uint16_t size;
- 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;
- }
- }
+ 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);
+ if (GNUNET_NO == have_address)
+ return; /* no point in advertising this one... */
+ peer = GNUNET_CONTAINER_multihashmap_get (peers, &pid.hashPubKey);
+ if (peer == NULL)
+ {
+ peer = make_peer (&pid, hello, GNUNET_NO);
+ }
+ else if (peer->hello != NULL)
+ {
+ dt = GNUNET_HELLO_equals (peer->hello, hello, GNUNET_TIME_absolute_get ());
+ if (dt.abs_value == GNUNET_TIME_UNIT_FOREVER_ABS.abs_value)
+ return; /* nothing new here */
+ }
+#if DEBUG_TOPOLOGY
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Found `%s' from peer `%s' for advertising\n", "HELLO",
+ GNUNET_i2s (&pid));
+#endif
+ if (peer->hello != NULL)
+ {
+ 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);
+ memcpy (peer->hello, hello, size);
+ }
+ if (peer->filter != NULL)
+ GNUNET_CONTAINER_bloomfilter_free (peer->filter);
+ 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_multihashmap_iterate (peers, &reschedule_hellos, peer);
}
/**
- * Find more peers that we should connect to and ask the
- * core to establish connections.
+ * 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
-find_more_peers (void *cls,
- const struct GNUNET_SCHEDULER_TaskContext *tc)
+process_peer (void *cls, const struct GNUNET_PeerIdentity *peer,
+ const struct GNUNET_HELLO_Message *hello, const char *err_msg)
{
- discard_old_blacklist_entries ();
- if (target_connection_count <= connection_count)
- {
- schedule_peer_search ();
- return;
- }
- if ( (GNUNET_YES == friends_only) ||
- (friend_count < minimum_friend_count) )
+ struct Peer *pos;
+
+ if (err_msg != NULL)
+ {
+ 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, &process_peer, NULL);
+ return;
+ }
+ GNUNET_assert (peer != NULL);
+ if (0 == memcmp (&my_identity, peer, sizeof (struct GNUNET_PeerIdentity)))
+ return; /* that's me! */
+ if (hello == NULL)
+ {
+ /* free existing HELLO, if any */
+ pos = GNUNET_CONTAINER_multihashmap_get (peers, &peer->hashPubKey);
+ if (NULL != pos)
{
- try_add_friends ();
- schedule_peer_search ();
- return;
+ GNUNET_free_non_null (pos->hello);
+ pos->hello = NULL;
+ if (pos->filter != NULL)
+ {
+ GNUNET_CONTAINER_bloomfilter_free (pos->filter);
+ pos->filter = NULL;
+ }
+ if ((!pos->is_connected) && (!pos->is_friend) &&
+ (0 ==
+ GNUNET_TIME_absolute_get_remaining (pos->
+ greylisted_until).rel_value))
+ free_peer (NULL, &pos->pid.hashPubKey, pos);
}
- GNUNET_PEERINFO_for_all (cfg,
- sched,
- NULL,
- 0, GNUNET_TIME_UNIT_FOREVER_REL,
- &process_peer, NULL);
+ return;
+ }
+ consider_for_advertising (hello);
+ pos = GNUNET_CONTAINER_multihashmap_get (peers, &peer->hashPubKey);
+ if (pos == NULL)
+ pos = make_peer (peer, hello, GNUNET_NO);
+ GNUNET_assert (NULL != pos);
+ if (GNUNET_YES == pos->is_connected)
+ {
+#if DEBUG_TOPOLOGY
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Already connected to peer `%s'\n",
+ GNUNET_i2s (peer));
+#endif
+ return;
+ }
+ if (GNUNET_TIME_absolute_get_remaining (pos->greylisted_until).rel_value > 0)
+ {
+#if DEBUG_TOPOLOGY
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Already tried peer `%s' recently\n",
+ GNUNET_i2s (peer));
+#endif
+ return; /* peer still greylisted */
+ }
+#if DEBUG_TOPOLOGY
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Considering connecting to peer `%s'\n",
+ GNUNET_i2s (peer));
+#endif
+ attempt_connect (pos);
}
* @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)
+core_init (void *cls, struct GNUNET_CORE_Handle *server,
+ const struct GNUNET_PeerIdentity *my_id,
+ const struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded *publicKey)
{
if (server == NULL)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
- _("Failed to connect to core service, can not manage topology!\n"));
- return;
- }
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ _
+ ("Failed to connect to core service, can not manage topology!\n"));
+ GNUNET_SCHEDULER_shutdown ();
+ return;
+ }
handle = server;
my_identity = *my_id;
- if (autoconnect)
- GNUNET_SCHEDULER_add_delayed (sched,
- GNUNET_NO,
- GNUNET_SCHEDULER_PRIORITY_DEFAULT,
- GNUNET_SCHEDULER_NO_PREREQUISITE_TASK,
- GNUNET_TIME_UNIT_SECONDS /* give core time to tell us about existing connections */,
- &find_more_peers,
- NULL);
+#if DEBUG_TOPOLOGY
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "I am peer `%s'\n", GNUNET_i2s (my_id));
+#endif
+ peerinfo_notify = GNUNET_PEERINFO_notify (cfg, &process_peer, NULL);
}
-/**
- * gnunet-daemon-topology command line options.
- */
-static struct GNUNET_GETOPT_CommandLineOption options[] = {
- GNUNET_GETOPT_OPTION_END
-};
-
-
/**
* Read the friends file.
*/
static void
-read_friends_file (struct GNUNET_CONFIGURATION_Handle *cfg)
+read_friends_file (const struct GNUNET_CONFIGURATION_Handle *cfg)
{
char *fn;
char *data;
size_t pos;
- GNUNET_HashCode hc;
+ struct GNUNET_PeerIdentity pid;
struct stat frstat;
struct GNUNET_CRYPTO_HashAsciiEncoded enc;
unsigned int entries_found;
- struct PeerList *fl;
-
- fn = NULL;
- GNUNET_CONFIGURATION_get_value_filename (cfg,
- "TOPOLOGY",
- "FRIENDS",
- &fn);
+ struct Peer *fl;
+
+ if (GNUNET_OK !=
+ GNUNET_CONFIGURATION_get_value_filename (cfg, "TOPOLOGY", "FRIENDS", &fn))
+ {
+ 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);
+ 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 ((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;
- }
+ {
+ 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;
- }
+ if (data == NULL)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ _("Failed to read friends list from `%s': out of memory\n"),
+ fn);
+ GNUNET_free (fn);
+ return;
+ }
+ 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]))
+ while ((pos < frstat.st_size) && isspace ((unsigned char) data[pos]))
pos++;
while ((frstat.st_size >= sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded)) &&
- (pos <= 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
+ ((unsigned char)
+ enc.encoding[sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded) - 1]))
{
- 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_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 ((unsigned char) data[pos])))
+ pos++;
+ continue;
}
- GNUNET_free (data);
- GNUNET_free (fn);
- if ( (minimum_friend_count > entries_found) &&
- (friends_only == GNUNET_NO) )
+ enc.encoding[sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded) - 1] = '\0';
+ if (GNUNET_OK !=
+ GNUNET_CRYPTO_hash_from_string ((char *) &enc, &pid.hashPubKey))
{
GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
- _("Fewer friends specified than required by minimum friend count. Will only connect to friends.\n"));
+ _
+ ("Syntax error in topology specification at offset %llu, skipping bytes `%s'.\n"),
+ (unsigned long long) pos, &enc);
}
- if ( (minimum_friend_count > target_connection_count) &&
- (friends_only == GNUNET_NO) )
+ else
{
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
- _("More friendly connections required than target total number of connections.\n"));
+ if (0 != memcmp (&pid, &my_identity, sizeof (struct GNUNET_PeerIdentity)))
+ {
+ 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));
+ }
+ else
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
+ _("Found myself `%s' in friend list (useless, ignored)\n"),
+ GNUNET_i2s (&pid));
+ }
}
+ pos = pos + sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded);
+ while ((pos < frstat.st_size) && isspace ((unsigned char) data[pos]))
+ pos++;
+ }
+ GNUNET_free (data);
+ GNUNET_free (fn);
+ 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"));
+ }
+ 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"));
+ }
}
* received.
*
* @param cls closure
- * @param peer the other peer involved (sender or receiver, NULL
+ * @param other the other peer involved (sender or receiver, NULL
* for loopback messages where we are both sender and receiver)
* @param message the actual HELLO message
+ * @param atsi performance data
* @return GNUNET_OK to keep the connection open,
* GNUNET_SYSERR to close it (signal serious error)
*/
static int
-handle_encrypted_hello (void *cls,
- const struct GNUNET_PeerIdentity * other,
- const struct GNUNET_MessageHeader *
- message)
+handle_encrypted_hello (void *cls, const struct GNUNET_PeerIdentity *other,
+ const struct GNUNET_MessageHeader *message,
+ const struct GNUNET_TRANSPORT_ATS_Information *atsi)
{
- if (transport != NULL)
- GNUNET_TRANSPORT_offer_hello (transport,
- message);
- return GNUNET_OK;
-}
-
+ struct Peer *peer;
+ struct GNUNET_PeerIdentity pid;
-/**
- * Peerinfo calls this function to let us know about a
- * possible peer that we might want to connect to.
- */
-static void
-gather_hello_callback (void *cls,
- const struct GNUNET_PeerIdentity *peer,
- const struct GNUNET_HELLO_Message *hello,
- uint32_t trust)
-{
+#if DEBUG_TOPOLOGY
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Received encrypted `%s' from peer `%s'",
+ "HELLO", GNUNET_i2s (other));
+#endif
+ if (GNUNET_OK !=
+ GNUNET_HELLO_get_id ((const struct GNUNET_HELLO_Message *) message, &pid))
+ {
+ GNUNET_break_op (0);
+ return GNUNET_SYSERR;
+ }
+ GNUNET_STATISTICS_update (stats, gettext_noop ("# HELLO messages received"),
+ 1, GNUNET_NO);
+ peer = GNUNET_CONTAINER_multihashmap_get (peers, &pid.hashPubKey);
if (peer == NULL)
- {
- hello_gathering_active = GNUNET_NO;
- return;
- }
- if (hello != NULL)
- consider_for_advertising (hello);
+ {
+ if ((GNUNET_YES == friends_only) || (friend_count < minimum_friend_count))
+ return GNUNET_OK;
+ }
+ else
+ {
+ if ((GNUNET_YES != peer->is_friend) && (GNUNET_YES == friends_only))
+ return GNUNET_OK;
+ if ((GNUNET_YES != peer->is_friend) &&
+ (friend_count < minimum_friend_count))
+ return GNUNET_OK;
+ }
+ if (transport != NULL)
+ GNUNET_TRANSPORT_offer_hello (transport, message, NULL, NULL);
+ return GNUNET_OK;
}
/**
* Function to fill send buffer with HELLO.
*
- * @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 'struct Peer' of the target peer
+ * @param size number of bytes available in buf
+ * @param buf where the callee should write the message
+ * @return number of bytes written to buf
*/
-static unsigned int
-hello_advertising (void *cls,
- const struct GNUNET_PeerIdentity *
- receiver,
- void *position, unsigned int padding)
+static size_t
+hello_advertising_ready (void *cls, size_t size, void *buf)
{
- struct PeerList *pl;
- struct HelloList *pos;
- struct HelloList *prev;
- struct HelloList *next;
- uint16_t size;
+ struct Peer *pl = cls;
+ struct FindAdvHelloContext fah;
+ size_t want;
- 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;
- }
+ pl->hello_req = NULL;
+ GNUNET_assert (GNUNET_YES == pl->is_connected);
/* 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;
+ fah.peer = pl;
+ fah.result = NULL;
+ fah.max_size = size;
+ fah.next_adv = GNUNET_TIME_UNIT_FOREVER_REL;
+ GNUNET_CONTAINER_multihashmap_iterate (peers, &find_advertisable_hello, &fah);
+ want = 0;
+ if (fah.result != NULL)
+ {
+ want = GNUNET_HELLO_size (fah.result->hello);
+ GNUNET_assert (want <= size);
+ memcpy (buf, fah.result->hello, want);
+ GNUNET_CONTAINER_bloomfilter_add (fah.result->filter, &pl->pid.hashPubKey);
+#if DEBUG_TOPOLOGY
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Sending `%s' with %u bytes", "HELLO",
+ (unsigned int) want);
+#endif
+ GNUNET_STATISTICS_update (stats,
+ gettext_noop ("# HELLO messages gossipped"), 1,
+ GNUNET_NO);
+ }
+
+ if (pl->hello_delay_task != GNUNET_SCHEDULER_NO_TASK)
+ GNUNET_SCHEDULER_cancel (pl->hello_delay_task);
+ pl->next_hello_allowed =
+ GNUNET_TIME_relative_to_absolute (HELLO_ADVERTISEMENT_MIN_FREQUENCY);
+ pl->hello_delay_task = GNUNET_SCHEDULER_add_now (&schedule_next_hello, pl);
+ return want;
}
/**
* Last task run during shutdown. Disconnects us from
* the transport and core.
+ *
+ * @param cls unused, NULL
+ * @param tc scheduler context
*/
static void
cleaning_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
{
- struct PeerList *pl;
-
+ if (NULL != peerinfo_notify)
+ {
+ GNUNET_PEERINFO_notify_cancel (peerinfo_notify);
+ peerinfo_notify = NULL;
+ }
+ if (GNUNET_SCHEDULER_NO_TASK != add_task)
+ {
+ GNUNET_SCHEDULER_cancel (add_task);
+ add_task = GNUNET_SCHEDULER_NO_TASK;
+ }
GNUNET_TRANSPORT_disconnect (transport);
transport = NULL;
- GNUNET_CORE_disconnect (handle);
- handle = NULL;
- while (NULL != (pl = friends))
- {
- friends = pl->next;
- GNUNET_free (pl);
- }
+ GNUNET_CONTAINER_multihashmap_iterate (peers, &free_peer, NULL);
+ GNUNET_CONTAINER_multihashmap_destroy (peers);
+ if (handle != NULL)
+ {
+ GNUNET_CORE_disconnect (handle);
+ handle = NULL;
+ }
+ whitelist_peers ();
+ if (stats != NULL)
+ {
+ 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,
- struct GNUNET_CONFIGURATION_Handle * c)
+run (void *cls, char *const *args, const char *cfgfile,
+ const struct GNUNET_CONFIGURATION_Handle *c)
{
- struct GNUNET_CORE_MessageHandler handlers[] =
- {
- { &handle_encrypted_hello, GNUNET_MESSAGE_TYPE_HELLO, 0},
- { NULL, 0, 0 }
- };
+ static struct GNUNET_CORE_MessageHandler handlers[] = {
+ {&handle_encrypted_hello, GNUNET_MESSAGE_TYPE_HELLO, 0},
+ {NULL, 0, 0}
+ };
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");
- opt = 0;
- GNUNET_CONFIGURATION_get_value_number (cfg,
- "TOPOLOGY",
- "MINIMUM-FRIENDS",
- &opt);
+ stats = GNUNET_STATISTICS_create ("topology", cfg);
+ autoconnect =
+ GNUNET_CONFIGURATION_get_value_yesno (cfg, "TOPOLOGY", "AUTOCONNECT");
+ friends_only =
+ GNUNET_CONFIGURATION_get_value_yesno (cfg, "TOPOLOGY", "FRIENDS-ONLY");
+ if (GNUNET_OK !=
+ GNUNET_CONFIGURATION_get_value_number (cfg, "TOPOLOGY", "MINIMUM-FRIENDS",
+ &opt))
+ opt = 0;
minimum_friend_count = (unsigned int) opt;
- opt = 16;
- GNUNET_CONFIGURATION_get_value_number (cfg,
- "TOPOLOGY",
- "TARGET-CONNECTION-COUNT",
- &opt);
+ if (GNUNET_OK !=
+ GNUNET_CONFIGURATION_get_value_number (cfg, "TOPOLOGY",
+ "TARGET-CONNECTION-COUNT", &opt))
+ opt = 16;
target_connection_count = (unsigned int) opt;
+ peers = GNUNET_CONTAINER_multihashmap_create (target_connection_count * 2);
- if ( (friends_only == GNUNET_YES) ||
- (minimum_friend_count > 0) )
+ 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_PREREQUISITE_TASK,
- GNUNET_TIME_UNIT_FOREVER_REL,
- &cleaning_task, NULL);
+#if DEBUG_TOPOLOGY
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Topology would like %u connections with at least %u friends (%s)\n",
+ target_connection_count, minimum_friend_count,
+ autoconnect ? "autoconnect enabled" : "autoconnect disabled");
+#endif
+ if ((friend_count < minimum_friend_count) && (blacklist == NULL))
+ blacklist = GNUNET_TRANSPORT_blacklist (cfg, &blacklist_check, NULL);
+ transport = GNUNET_TRANSPORT_connect (cfg, NULL, NULL, NULL, NULL, NULL);
+ handle =
+ GNUNET_CORE_connect (cfg, 1, NULL, &core_init, &connect_notify,
+ &disconnect_notify, NULL, NULL, GNUNET_NO, NULL,
+ GNUNET_NO, handlers);
+ GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL, &cleaning_task,
+ NULL);
+ if (NULL == transport)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ _("Failed to connect to `%s' service.\n"), "transport");
+ GNUNET_SCHEDULER_shutdown ();
+ return;
+ }
+ 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;
+ ret =
+ (GNUNET_OK ==
+ GNUNET_PROGRAM_run (argc, argv, "gnunet-daemon-topology",
+ _
+ ("GNUnet topology control (maintaining P2P mesh and F2F constraints)"),
+ options, &run, NULL)) ? 0 : 1;
return ret;
}
projects / oweals / gnunet.git / blobdiff