/*
This file is part of GNUnet.
- (C) 2011 - 2014 Christian Grothoff (and other contributing authors)
+ Copyright (C) 2011 - 2014 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
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.
*/
/**
#include "gnunet-service-xdht_routing.h"
#include "gnunet-service-xdht.h"
+
/**
- * Maximum number of entries in routing table.
+ * FIXME: Check if its better to store pointer to friend rather than storing
+ * peer identity next_hop or prev_hop.
+ * keep entries in destnation and source peer also. so when we send the trail
+ * teardown message then we don't know the source but if source gets the message
+ * then it shold remove that trail id from its finger table. But how does
+ * source know what is the desination finger ? It will whenevr contact a trail
+ * will do a lookup in routing table and if no trail id present the remove
+ * that trail of the finger and if only one trail then remove the finger.
+ * because of this use case of trail teardown I think trail compression
+ * and trail teardown should not be merged.
+ * 2. store a pointer to friendInfo in place o peer identity.
*/
-#define ROUTING_TABLE_THRESHOLD 64
-
+/**
+ * Maximum number of entries in routing table.
+ */
+#define ROUTING_TABLE_THRESHOLD 80000
/**
- * FIXME: do we need to store destination and source.
- * because in trail teardown we will reach destination but it will not find any
- * entry in routing table. so we should store destination and source.
+ * FIXME: Store friend pointer instead of peer identifier.
* Routing table entry .
*/
struct RoutingTrail
* Global Unique identifier of the trail.
*/
struct GNUNET_HashCode trail_id;
-
+
/**
* The peer to which this request should be passed to.
*/
struct GNUNET_PeerIdentity next_hop;
-
+
/**
- * Peer just before next hop in the trail.
+ * Peer just before next hop in the trail.
*/
struct GNUNET_PeerIdentity prev_hop;
};
static struct GNUNET_CONTAINER_MultiHashMap *routing_table;
/**
- * Update the prev. hop of the trail. Call made by trail teardown where
+ * Update the prev. hop of the trail. Call made by trail compression where
* if you are the first friend now in the trail then you need to update
* your prev. hop.
* @param trail_id
* @return #GNUNET_OK success
- * #GNUNET_SYSERR in case no matching entry found in routing table.
+ * #GNUNET_SYSERR in case no matching entry found in routing table.
*/
int
GDS_ROUTING_update_trail_prev_hop (const struct GNUNET_HashCode trail_id,
struct GNUNET_PeerIdentity prev_hop)
{
struct RoutingTrail *trail;
-
+
trail = GNUNET_CONTAINER_multihashmap_get (routing_table, &trail_id);
-
+
if (NULL == trail)
return GNUNET_SYSERR;
-
+
trail->prev_hop = prev_hop;
return GNUNET_OK;
}
+/**
+ * Update the next hop of the trail. Call made by trail compression where
+ * if you are source of the trail and now you have a new first friend, then
+ * you should update the trail.
+ * @param trail_id
+ * @return #GNUNET_OK success
+ * #GNUNET_SYSERR in case no matching entry found in routing table.
+ */
+int
+GDS_ROUTING_update_trail_next_hop (const struct GNUNET_HashCode trail_id,
+ struct GNUNET_PeerIdentity next_hop)
+{
+ struct RoutingTrail *trail;
+
+ trail = GNUNET_CONTAINER_multihashmap_get (routing_table, &trail_id);
+
+ if (NULL == trail)
+
+ return GNUNET_SYSERR;
+
+ trail->next_hop = next_hop;
+ return GNUNET_OK;
+}
/**
* Get the next hop for trail corresponding to trail_id
- * @param trail_id Trail id to be searched.
+ * @param trail_id Trail id to be searched.
* @return Next_hop if found
- * NULL If next hop not found.
+ * NULL If next hop not found.
*/
struct GNUNET_PeerIdentity *
GDS_ROUTING_get_next_hop (const struct GNUNET_HashCode trail_id,
enum GDS_ROUTING_trail_direction trail_direction)
{
struct RoutingTrail *trail;
-
- trail = GNUNET_CONTAINER_multihashmap_get (routing_table, &trail_id);
+ trail = GNUNET_CONTAINER_multihashmap_get (routing_table, &trail_id);
if (NULL == trail)
+ {
+ /* If a friend got disconnected and we removed all the entry from the
+ routing table, then trail will be deleted and my identity will not know
+ and when it tries to reach to that finger it fails. thats why
+ assertion always fails in*/
return NULL;
-
+ }
switch (trail_direction)
{
case GDS_ROUTING_SRC_TO_DEST:
/**
* Remove trail with trail_id
* @param trail_id Trail id to be removed
- * @return #GNUNET_YES success
+ * @return #GNUNET_YES success
* #GNUNET_NO if entry not found.
*/
int
GDS_ROUTING_remove_trail (const struct GNUNET_HashCode remove_trail_id)
{
struct RoutingTrail *remove_entry;
-
+
remove_entry = GNUNET_CONTAINER_multihashmap_get (routing_table, &remove_trail_id);
-
if (NULL == remove_entry)
return GNUNET_NO;
-
+
if (GNUNET_YES == GNUNET_CONTAINER_multihashmap_remove (routing_table,
- &remove_trail_id,
+ &remove_trail_id,
remove_entry))
{
GNUNET_free (remove_entry);
return GNUNET_YES;
- }
+ }
+
return GNUNET_NO;
}
/**
* Iterate over routing table and remove entries with value as part of any trail.
+ *
* @param cls closure
* @param key current public key
* @param value value in the hash map
const struct GNUNET_HashCode *key,
void *value)
{
- struct RoutingTrail *remove_trail = cls;
- struct GNUNET_PeerIdentity *peer = value;
-
- if ((0 == GNUNET_CRYPTO_cmp_peer_identity (&remove_trail->next_hop, peer)) ||
- (0 == GNUNET_CRYPTO_cmp_peer_identity (&remove_trail->prev_hop, peer)))
+ struct RoutingTrail *remove_trail = value;
+ struct GNUNET_PeerIdentity *disconnected_peer = cls;
+ struct GNUNET_HashCode trail_id = *key;
+ struct GNUNET_PeerIdentity my_identity;
+
+ /* If disconnected_peer is next_hop, then send a trail teardown message through
+ * prev_hop in direction from destination to source. */
+ if (0 == GNUNET_CRYPTO_cmp_peer_identity (&remove_trail->next_hop,
+ disconnected_peer))
{
- GNUNET_assert (GNUNET_YES ==
+ my_identity = GDS_NEIGHBOURS_get_my_id ();
+ if (0 != GNUNET_CRYPTO_cmp_peer_identity (&my_identity,
+ &remove_trail->prev_hop))
+ {
+ GDS_NEIGHBOURS_send_trail_teardown (&trail_id,
+ GDS_ROUTING_DEST_TO_SRC,
+ &remove_trail->prev_hop);
+ }
+ }
+
+ /* If disconnected_peer is prev_hop, then send a trail teardown through
+ * next_hop in direction from Source to Destination. */
+ if (0 == GNUNET_CRYPTO_cmp_peer_identity (&remove_trail->prev_hop,
+ disconnected_peer))
+ {
+ my_identity = GDS_NEIGHBOURS_get_my_id ();
+
+ if (0 != GNUNET_CRYPTO_cmp_peer_identity (&my_identity,
+ &remove_trail->next_hop))
+ {
+ GDS_NEIGHBOURS_send_trail_teardown (&trail_id,
+ GDS_ROUTING_SRC_TO_DEST,
+ &remove_trail->next_hop);
+ }
+ }
+
+ GNUNET_assert (GNUNET_YES ==
GNUNET_CONTAINER_multihashmap_remove (routing_table,
- &remove_trail->trail_id,
+ &trail_id,
remove_trail));
- GNUNET_free (remove_trail);
- }
- return GNUNET_YES;
+ GNUNET_free (remove_trail);
+ return GNUNET_YES;
}
-
+#if 0
/**
- * * FIXME: when a friend gets disconnected, then we remove the entry from routing
- * table where this friend is either a next_hop or prev_hop. But we don't communicate
- * that the trail is broken to any one who is part of trail. Should we communicate or
- * not. And if not then the cases where trail setup fails because next_hop = NULL
- * or something like that. VERY URGENT.
- * Remove every trail where peer is either next_hop or prev_hop
- * @param peer Peer to be searched.
+ * TEST FUNCTION
+ * Remove after using.
*/
void
+GDS_ROUTING_test_print (void)
+{
+ struct GNUNET_CONTAINER_MultiHashMapIterator *iter;
+ struct RoutingTrail *trail;
+ struct GNUNET_PeerIdentity print_peer;
+ struct GNUNET_HashCode key_ret;
+ int i;
+
+ struct GNUNET_PeerIdentity my_identity = GDS_NEIGHBOURS_get_my_id();
+ print_peer = my_identity;
+ FPRINTF (stderr,_("\nSUPU ***PRINTING ROUTING TABLE ***** of =%s"),GNUNET_i2s(&print_peer));
+ iter =GNUNET_CONTAINER_multihashmap_iterator_create (routing_table);
+ for (i = 0; i < GNUNET_CONTAINER_multihashmap_size(routing_table); i++)
+ {
+ if(GNUNET_YES == GNUNET_CONTAINER_multihashmap_iterator_next (iter,
+ &key_ret,
+ (const void **)&trail))
+ {
+ FPRINTF (stderr,_("\nSUPU %s, %s, %d, trail->trail_id = %s"),
+ __FILE__, __func__,__LINE__, GNUNET_h2s(&trail->trail_id));
+ memcpy (&print_peer, &trail->next_hop, sizeof (struct GNUNET_PeerIdentity));
+ FPRINTF (stderr,_("\nSUPU %s, %s, %d, trail->next_hop = %s"),
+ __FILE__, __func__,__LINE__, GNUNET_i2s(&print_peer));
+ memcpy (&print_peer, &trail->prev_hop, sizeof (struct GNUNET_PeerIdentity));
+ FPRINTF (stderr,_("\nSUPU %s, %s, %d, trail->prev_hop = %s"),
+ __FILE__, __func__,__LINE__, GNUNET_i2s(&print_peer));
+ }
+ }
+}
+#endif
+
+/**
+ * Remove every trail where peer is either next_hop or prev_hop. Also send a
+ * trail teardown message in direction of hop which is not disconnected.
+ * @param peer Peer identity. Trail containing this peer should be removed.
+ */
+int
GDS_ROUTING_remove_trail_by_peer (const struct GNUNET_PeerIdentity *peer)
{
- GNUNET_CONTAINER_multihashmap_iterate (routing_table, &remove_matching_trails,
- (void *)peer);
+ int ret;
+
+
+ /* No entries in my routing table. */
+ if (0 == GNUNET_CONTAINER_multihashmap_size(routing_table))
+ return GNUNET_YES;
+
+ ret = GNUNET_CONTAINER_multihashmap_iterate (routing_table,
+ &remove_matching_trails,
+ (void *)peer);
+ return ret;
}
* but with different prev_hop/next_hop
*/
int
-GDS_ROUTING_add (struct GNUNET_HashCode new_trail_id,
- struct GNUNET_PeerIdentity *prev_hop,
- const struct GNUNET_PeerIdentity *next_hop)
+GDS_ROUTING_add (struct GNUNET_HashCode new_trail_id,
+ struct GNUNET_PeerIdentity prev_hop,
+ struct GNUNET_PeerIdentity next_hop)
{
struct RoutingTrail *new_entry;
-
- new_entry = GNUNET_malloc (sizeof (struct RoutingTrail));
+
+ new_entry = GNUNET_new (struct RoutingTrail);
new_entry->trail_id = new_trail_id;
- new_entry->next_hop = *next_hop;
- new_entry->prev_hop = *prev_hop;
- return GNUNET_CONTAINER_multihashmap_put (routing_table,
+ new_entry->next_hop = next_hop;
+ new_entry->prev_hop = prev_hop;
+
+
+ return GNUNET_CONTAINER_multihashmap_put (routing_table,
&new_trail_id, new_entry,
GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
+
}
/**
- * Check if the size of routing table has crossed threshold.
+ * Check if the size of routing table has crossed ROUTING_TABLE_THRESHOLD.
+ * It means that I don't have any more space in my routing table and I can not
+ * be part of any more trails till there is free space in my routing table.
* @return #GNUNET_YES, if threshold crossed else #GNUNET_NO.
*/
int
GDS_ROUTING_threshold_reached (void)
{
- return (GNUNET_CONTAINER_multihashmap_size(routing_table) >
- ROUTING_TABLE_THRESHOLD) ? GNUNET_YES:GNUNET_NO;
+ return (GNUNET_CONTAINER_multihashmap_size(routing_table) >
+ ROUTING_TABLE_THRESHOLD) ? GNUNET_YES:GNUNET_NO;
}
*/
void
GDS_ROUTING_init (void)
-{
+{
routing_table = GNUNET_CONTAINER_multihashmap_create (ROUTING_TABLE_THRESHOLD * 4 / 3,
GNUNET_NO);
}
GNUNET_CONTAINER_multihashmap_destroy (routing_table);
}
-/* end of gnunet-service-xdht_routing.c */
\ No newline at end of file
+/* end of gnunet-service-xdht_routing.c */
projects / oweals / gnunet.git / blobdiff