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-rw-r--r--src/topology/gnunet-daemon-topology.c172
1 files changed, 106 insertions, 66 deletions
diff --git a/src/topology/gnunet-daemon-topology.c b/src/topology/gnunet-daemon-topology.c
index 38a648a..382c9f3 100644
--- a/src/topology/gnunet-daemon-topology.c
+++ b/src/topology/gnunet-daemon-topology.c
@@ -23,8 +23,6 @@
* @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"
@@ -35,39 +33,46 @@
#include "gnunet_util_lib.h"
-#define DEBUG_TOPOLOGY GNUNET_YES
+/**
+ * Minimum required delay between calls to GNUNET_TRANSPORT_try_connect.
+ */
+#define MAX_CONNECT_FREQUENCY_DELAY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS, 250)
/**
* For how long do we blacklist a peer after a failed connection
- * attempt?
+ * attempt? This is the baseline factor which is then multiplied by
+ * two to the power of the number of failed attempts.
*/
-#define GREYLIST_AFTER_ATTEMPT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 15)
+#define GREYLIST_AFTER_ATTEMPT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 1)
/**
* For how long do we blacklist a friend after a failed connection
- * attempt?
+ * attempt? This is the baseline factor which is then multiplied by
+ * two to the power of the number of failed attempts.
*/
-#define GREYLIST_AFTER_ATTEMPT_FRIEND GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 2)
+#define GREYLIST_AFTER_ATTEMPT_FRIEND GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 2)
/**
- * For how long do we blacklist anyone under any cirumstances after a failed connection
- * attempt?
+ * For how long do we blacklist anyone under any cirumstances at least after a failed connection
+ * attempt? This is the absolute minimum, regardless of what the calculation based on
+ * exponential backoff returns.
*/
-#define GREYLIST_AFTER_ATTEMPT_MIN GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 15)
+#define GREYLIST_AFTER_ATTEMPT_MIN GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 5)
/**
- * For how long do we blacklist anyone under any cirumstances after a failed connection
- * attempt?
+ * For how long do we blacklist anyone under any cirumstances at most after a failed connection
+ * attempt? This is the absolute maximum, regardless of what the calculation based on
+ * exponential back-off returns.
*/
#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?
+ * At what frequency do we sent HELLOs to a peer?
*/
-#define HELLO_ADVERTISEMENT_MIN_FREQUENCY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_HOURS, 4)
+#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?
+ * After what time period do we expire the HELLO Bloom filter?
*/
#define HELLO_ADVERTISEMENT_MIN_REPEAT_FREQUENCY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_HOURS, 4)
@@ -122,6 +127,11 @@ struct Peer
GNUNET_SCHEDULER_TaskIdentifier hello_delay_task;
/**
+ * Task for issuing GNUNET_TRANSPORT_try_connect for this peer.
+ */
+ GNUNET_SCHEDULER_TaskIdentifier attempt_connect_task;
+
+ /**
* ID of task we use to clear peers from the greylist.
*/
GNUNET_SCHEDULER_TaskIdentifier greylist_clean_task;
@@ -188,6 +198,11 @@ static struct GNUNET_STATISTICS_Handle *stats;
static struct GNUNET_TRANSPORT_Blacklist *blacklist;
/**
+ * When can we next ask transport to create a connection?
+ */
+static struct GNUNET_TIME_Absolute next_connect_attempt;
+
+/**
* Task scheduled to try to add peers.
*/
static GNUNET_SCHEDULER_TaskIdentifier add_task;
@@ -278,20 +293,16 @@ is_connection_allowed (struct Peer *peer)
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;
}
@@ -309,12 +320,15 @@ free_peer (void *cls, const GNUNET_HashCode * pid, void *value)
{
struct Peer *pos = value;
+ GNUNET_break (GNUNET_NO == pos->is_connected);
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->hello_delay_task != GNUNET_SCHEDULER_NO_TASK)
GNUNET_SCHEDULER_cancel (pos->hello_delay_task);
+ if (pos->attempt_connect_task != GNUNET_SCHEDULER_NO_TASK)
+ GNUNET_SCHEDULER_cancel (pos->attempt_connect_task);
if (pos->greylist_clean_task != GNUNET_SCHEDULER_NO_TASK)
GNUNET_SCHEDULER_cancel (pos->greylist_clean_task);
GNUNET_free_non_null (pos->hello);
@@ -371,10 +385,8 @@ attempt_connect (struct Peer *pos)
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 transport"), 1,
@@ -384,6 +396,51 @@ attempt_connect (struct Peer *pos)
/**
+ * Try to connect to the specified peer.
+ *
+ * @param cls peer to connect to
+ * @param tc scheduler context
+ */
+static void
+do_attempt_connect (void *cls,
+ const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+ struct Peer *pos = cls;
+ struct GNUNET_TIME_Relative delay;
+
+ pos->attempt_connect_task = GNUNET_SCHEDULER_NO_TASK;
+ if (GNUNET_YES == pos->is_connected)
+ return;
+ delay = GNUNET_TIME_absolute_get_remaining (next_connect_attempt);
+ if (delay.rel_value > 0)
+ {
+ pos->attempt_connect_task = GNUNET_SCHEDULER_add_delayed (delay,
+ &do_attempt_connect,
+ pos);
+ return;
+ }
+ next_connect_attempt = GNUNET_TIME_relative_to_absolute (MAX_CONNECT_FREQUENCY_DELAY);
+ attempt_connect (pos);
+}
+
+
+/**
+ * Schedule a task to try to connect to the specified peer.
+ *
+ * @param pos peer to connect to
+ */
+static void
+schedule_attempt_connect (struct Peer *pos)
+{
+ if (GNUNET_SCHEDULER_NO_TASK != pos->attempt_connect_task)
+ return;
+ pos->attempt_connect_task = GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_absolute_get_remaining (next_connect_attempt),
+ &do_attempt_connect,
+ pos);
+}
+
+
+/**
* Discard peer entries for greylisted peers
* where the greylisting has expired.
*
@@ -400,7 +457,7 @@ remove_from_greylist (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
rem = GNUNET_TIME_absolute_get_remaining (pos->greylisted_until);
if (rem.rel_value == 0)
{
- attempt_connect (pos);
+ schedule_attempt_connect (pos);
}
else
{
@@ -642,11 +699,9 @@ connect_notify (void *cls, const struct GNUNET_PeerIdentity *peer,
{
struct Peer *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;
@@ -654,7 +709,7 @@ connect_notify (void *cls, const struct GNUNET_PeerIdentity *peer,
GNUNET_STATISTICS_set (stats, gettext_noop ("# peers connected"),
connection_count, GNUNET_NO);
pos = GNUNET_CONTAINER_multihashmap_get (peers, &peer->hashPubKey);
- if (pos == NULL)
+ if (NULL == pos)
{
pos = make_peer (peer, NULL, GNUNET_NO);
GNUNET_break (GNUNET_OK == is_connection_allowed (pos));
@@ -692,7 +747,7 @@ try_add_peers (void *cls, const GNUNET_HashCode * pid, void *value)
{
struct Peer *pos = value;
- attempt_connect (pos);
+ schedule_attempt_connect (pos);
return GNUNET_YES;
}
@@ -712,6 +767,7 @@ add_peer_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
GNUNET_CONTAINER_multihashmap_iterate (peers, &try_add_peers, NULL);
}
+
/**
* Method called whenever a peer disconnects.
*
@@ -725,13 +781,11 @@ disconnect_notify (void *cls, const struct GNUNET_PeerIdentity *peer)
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)
+ if (NULL == pos)
{
GNUNET_break (0);
return;
@@ -818,7 +872,7 @@ consider_for_advertising (const struct GNUNET_HELLO_Message *hello)
if (GNUNET_NO == have_address)
return; /* no point in advertising this one... */
peer = GNUNET_CONTAINER_multihashmap_get (peers, &pid.hashPubKey);
- if (peer == NULL)
+ if (NULL == peer)
{
peer = make_peer (&pid, hello, GNUNET_NO);
}
@@ -828,11 +882,9 @@ consider_for_advertising (const struct GNUNET_HELLO_Message *hello)
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);
@@ -894,7 +946,7 @@ process_peer (void *cls, const struct GNUNET_PeerIdentity *peer,
GNUNET_CONTAINER_bloomfilter_free (pos->filter);
pos->filter = NULL;
}
- if ((!pos->is_connected) && (!pos->is_friend) &&
+ if ((GNUNET_NO == pos->is_connected) && (GNUNET_NO == pos->is_friend) &&
(0 ==
GNUNET_TIME_absolute_get_remaining (pos->
greylisted_until).rel_value))
@@ -909,25 +961,19 @@ process_peer (void *cls, const struct GNUNET_PeerIdentity *peer,
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);
+ schedule_attempt_connect (pos);
}
@@ -953,9 +999,7 @@ core_init (void *cls, struct GNUNET_CORE_Handle *server,
}
handle = server;
my_identity = *my_id;
-#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);
}
@@ -970,7 +1014,7 @@ read_friends_file (const struct GNUNET_CONFIGURATION_Handle *cfg)
char *data;
size_t pos;
struct GNUNET_PeerIdentity pid;
- struct stat frstat;
+ uint64_t fsize;
struct GNUNET_CRYPTO_HashAsciiEncoded enc;
unsigned int entries_found;
struct Peer *fl;
@@ -987,7 +1031,8 @@ read_friends_file (const struct GNUNET_CONFIGURATION_Handle *cfg)
GNUNET_DISK_fn_write (fn, NULL, 0,
GNUNET_DISK_PERM_USER_READ |
GNUNET_DISK_PERM_USER_WRITE);
- if (0 != STAT (fn, &frstat))
+ if (GNUNET_OK != GNUNET_DISK_file_size (fn,
+ &fsize, GNUNET_NO, GNUNET_YES))
{
if ((friends_only) || (minimum_friend_count > 0))
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
@@ -995,14 +1040,14 @@ read_friends_file (const struct GNUNET_CONFIGURATION_Handle *cfg)
GNUNET_free (fn);
return;
}
- if (frstat.st_size == 0)
+ if (fsize == 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);
+ data = GNUNET_malloc_large (fsize);
if (data == NULL)
{
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
@@ -1011,7 +1056,7 @@ read_friends_file (const struct GNUNET_CONFIGURATION_Handle *cfg)
GNUNET_free (fn);
return;
}
- if (frstat.st_size != GNUNET_DISK_fn_read (fn, data, frstat.st_size))
+ if (fsize != GNUNET_DISK_fn_read (fn, data, fsize))
{
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
_("Failed to read friends list from `%s'\n"), fn);
@@ -1021,11 +1066,11 @@ read_friends_file (const struct GNUNET_CONFIGURATION_Handle *cfg)
}
entries_found = 0;
pos = 0;
- while ((pos < frstat.st_size) && isspace ((unsigned char) data[pos]))
+ while ((pos < fsize) && isspace ((unsigned char) data[pos]))
pos++;
- while ((frstat.st_size >= sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded)) &&
+ while ((fsize >= sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded)) &&
(pos <=
- frstat.st_size - sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded)))
+ fsize - sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded)))
{
memcpy (&enc, &data[pos], sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded));
if (!isspace
@@ -1037,7 +1082,7 @@ read_friends_file (const struct GNUNET_CONFIGURATION_Handle *cfg)
("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])))
+ while ((pos < fsize) && (!isspace ((unsigned char) data[pos])))
pos++;
continue;
}
@@ -1068,7 +1113,7 @@ read_friends_file (const struct GNUNET_CONFIGURATION_Handle *cfg)
}
}
pos = pos + sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded);
- while ((pos < frstat.st_size) && isspace ((unsigned char) data[pos]))
+ while ((pos < fsize) && isspace ((unsigned char) data[pos]))
pos++;
}
GNUNET_free (data);
@@ -1113,10 +1158,8 @@ handle_encrypted_hello (void *cls, const struct GNUNET_PeerIdentity *other,
struct Peer *peer;
struct GNUNET_PeerIdentity pid;
-#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))
{
@@ -1126,7 +1169,7 @@ handle_encrypted_hello (void *cls, const struct GNUNET_PeerIdentity *other,
GNUNET_STATISTICS_update (stats, gettext_noop ("# HELLO messages received"),
1, GNUNET_NO);
peer = GNUNET_CONTAINER_multihashmap_get (peers, &pid.hashPubKey);
- if (peer == NULL)
+ if (NULL == peer)
{
if ((GNUNET_YES == friends_only) || (friend_count < minimum_friend_count))
return GNUNET_OK;
@@ -1175,10 +1218,8 @@ hello_advertising_ready (void *cls, size_t size, void *buf)
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);
@@ -1208,21 +1249,22 @@ cleaning_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
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_CONTAINER_multihashmap_iterate (peers, &free_peer, NULL);
- GNUNET_CONTAINER_multihashmap_destroy (peers);
if (handle != NULL)
{
GNUNET_CORE_disconnect (handle);
handle = NULL;
}
whitelist_peers ();
+ if (GNUNET_SCHEDULER_NO_TASK != add_task)
+ {
+ GNUNET_SCHEDULER_cancel (add_task);
+ add_task = GNUNET_SCHEDULER_NO_TASK;
+ }
+ GNUNET_CONTAINER_multihashmap_iterate (peers, &free_peer, NULL);
+ GNUNET_CONTAINER_multihashmap_destroy (peers);
+ peers = NULL;
if (stats != NULL)
{
GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
@@ -1269,12 +1311,10 @@ run (void *cls, char *const *args, const char *cfgfile,
if ((friends_only == GNUNET_YES) || (minimum_friend_count > 0))
read_friends_file (cfg);
-#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);
generated by cgit v1.2.3-18-g5258 (git 2.32.0) at 2024-11-21 15:35:39 +0000