2 This file is part of GNUnet.
3 (C) 2011 Christian Grothoff (and other contributing authors)
5 GNUnet is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 3, or (at your
8 option) any later version.
10 GNUnet is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA.
22 * @file dht/gnunet-service-xdht_routing.c
23 * @brief GNUnet DHT tracking of requests for routing replies
24 * @author Supriti Singh
27 #include "gnunet-service-xdht_neighbours.h"
28 #include "gnunet-service-xdht_routing.h"
29 #include "gnunet-service-xdht.h"
33 * Number of requests we track at most (for routing replies).
35 #define DHT_MAX_RECENT (1024 * 16)
39 * FIXME: Do we need a field prev_hop
40 * Routing table entry .
47 struct GNUNET_PeerIdentity source;
52 struct GNUNET_PeerIdentity destination;
55 * The peer to which this request should be passed to.
57 struct GNUNET_PeerIdentity next_hop;
63 * Routing table of the peer
65 static struct GNUNET_CONTAINER_MultiPeerMap *routing_table;
69 * FIXME: Change the name of variable.
70 * Ensure that everywhere in this file you are using destination as the key.
71 * Do we need prev field in routing table?
72 * Add a new entry to our routing table.
78 GDS_ROUTING_add (struct GNUNET_PeerIdentity *source,
79 struct GNUNET_PeerIdentity *dest,
80 struct GNUNET_PeerIdentity *next_hop)
82 struct RoutingTrail *new_routing_entry;
84 /* If dest is already present in the routing table, then exit.*/
86 GNUNET_CONTAINER_multipeermap_contains (routing_table, dest))
92 new_routing_entry = GNUNET_malloc (sizeof (struct RoutingTrail));
93 memcpy (&(new_routing_entry->source) , source, sizeof (struct GNUNET_PeerIdentity));
94 memcpy (&(new_routing_entry->next_hop), next_hop, sizeof (struct GNUNET_PeerIdentity));
95 memcpy (&(new_routing_entry->destination), dest, sizeof (struct GNUNET_PeerIdentity));
97 GNUNET_assert (GNUNET_OK ==
98 GNUNET_CONTAINER_multipeermap_put (routing_table,
99 dest, new_routing_entry,
100 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
104 /**FIXME: Test if its correct or not.
105 * Find the next hop to send packet to .
106 * @return next hop peer id
108 struct GNUNET_PeerIdentity *
109 GDS_ROUTING_search(struct GNUNET_PeerIdentity *source_peer,
110 struct GNUNET_PeerIdentity *destination_peer)
112 struct RoutingTrail *trail;
113 trail = (struct RoutingTrail *)(GNUNET_CONTAINER_multipeermap_get(routing_table,destination_peer));
118 return &(trail->next_hop);
122 /**FIXME: Old implementation just to remove error
123 * Handle a reply (route to origin). Only forwards the reply back to
124 * other peers waiting for it. Does not do local caching or
125 * forwarding to local clients. Essentially calls
126 * GDS_NEIGHBOURS_handle_reply for all peers that sent us a matching
129 * @param type type of the block
130 * @param expiration_time when does the content expire
131 * @param key key for the content
132 * @param put_path_length number of entries in put_path
133 * @param put_path peers the original PUT traversed (if tracked)
134 * @param get_path_length number of entries in get_path
135 * @param get_path peers this reply has traversed so far (if tracked)
136 * @param data payload of the reply
137 * @param data_size number of bytes in data
140 GDS_ROUTING_process (enum GNUNET_BLOCK_Type type,
141 struct GNUNET_TIME_Absolute expiration_time,
142 const struct GNUNET_HashCode * key, unsigned int put_path_length,
143 const struct GNUNET_PeerIdentity *put_path,
144 unsigned int get_path_length,
145 const struct GNUNET_PeerIdentity *get_path,
146 const void *data, size_t data_size)
153 * Initialize routing subsystem.
158 routing_table = GNUNET_CONTAINER_multipeermap_create (DHT_MAX_RECENT * 4 / 3, GNUNET_NO);
163 * Shutdown routing subsystem.
168 GNUNET_assert (0 == GNUNET_CONTAINER_multipeermap_size (routing_table));
169 GNUNET_CONTAINER_multipeermap_destroy (routing_table);
172 /* end of gnunet-service-xdht_routing.c */