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/*
This file is part of GNUnet.
(C) 2011 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 3, or (at your
option) any later version.
GNUnet is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
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.
*/
/**
* @file dht/gnunet-service-xdht_routing.c
* @brief GNUnet DHT tracking of requests for routing replies
* @author Supriti Singh
*/
#include "platform.h"
#include "gnunet-service-xdht_neighbours.h"
#include "gnunet-service-xdht_routing.h"
#include "gnunet-service-xdht.h"
/* FIXME
* 1. We need field to understand which routing table is for which peer.
* 2. Better function names and variable names.
* 3. Use destination peer id as key for routing table.
* 4. What does GDS stands for?
*
*/
/**
* Number of requests we track at most (for routing replies).
*/
#define DHT_MAX_RECENT (1024 * 16)
/**
* Routing table entry .
*/
struct RoutingTrail
{
/**
* Source peer .
*/
struct GNUNET_PeerIdentity *source;
/**
* Destination peer.
*/
struct GNUNET_PeerIdentity *destination;
/**
* The peer this request was received from.
*/
struct GNUNET_PeerIdentity *previous_hop;
/**
* The peer to which this request should be passed to.
*/
struct GNUNET_PeerIdentity *next_hop;
};
/**
* Routing table of the peer
*/
static struct GNUNET_CONTAINER_MultiPeerMap *routing_table;
/**
* FIXME: Change the name of variable.
* Ensure that everywhere in this file you are using destination as the key.
* Do we need prev field in routing table?
* Add a new entry to our routing table.
* @param source peer
* @param destintation
* @param next_hop
*/
void
GDS_ROUTING_add (struct GNUNET_PeerIdentity *source,
struct GNUNET_PeerIdentity *dest,
struct GNUNET_PeerIdentity *next_hop)
{
struct RoutingTrail *new_routing_entry;
new_routing_entry = GNUNET_malloc (sizeof (struct RoutingTrail));
new_routing_entry->source = source;
new_routing_entry->next_hop = next_hop;
new_routing_entry->destination = dest;
/* If dest is already present in the routing table, then exit.*/
if (GNUNET_YES ==
GNUNET_CONTAINER_multipeermap_contains (routing_table,
dest))
{
GNUNET_break (0);
return;
}
GNUNET_assert (GNUNET_OK ==
GNUNET_CONTAINER_multipeermap_put (routing_table,
dest, new_routing_entry,
GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
}
/**
* Find the next hop to send packet to .
* @return next hop peer id
*/
struct GNUNET_PeerIdentity *
GDS_ROUTING_search(struct GNUNET_PeerIdentity *source_peer,
struct GNUNET_PeerIdentity *destination_peer)
{
struct RoutingTrail *trail;
trail = (struct RoutingTrail *)(GNUNET_CONTAINER_multipeermap_get(routing_table,destination_peer));
if(trail == NULL)
return NULL;
return trail->next_hop;
}
/**FIXME: Old implementation just to remove error
* Handle a reply (route to origin). Only forwards the reply back to
* other peers waiting for it. Does not do local caching or
* forwarding to local clients. Essentially calls
* GDS_NEIGHBOURS_handle_reply for all peers that sent us a matching
* request recently.
*
* @param type type of the block
* @param expiration_time when does the content expire
* @param key key for the content
* @param put_path_length number of entries in put_path
* @param put_path peers the original PUT traversed (if tracked)
* @param get_path_length number of entries in get_path
* @param get_path peers this reply has traversed so far (if tracked)
* @param data payload of the reply
* @param data_size number of bytes in data
*/
void
GDS_ROUTING_process (enum GNUNET_BLOCK_Type type,
struct GNUNET_TIME_Absolute expiration_time,
const struct GNUNET_HashCode * key, unsigned int put_path_length,
const struct GNUNET_PeerIdentity *put_path,
unsigned int get_path_length,
const struct GNUNET_PeerIdentity *get_path,
const void *data, size_t data_size)
{
}
/**
* Initialize routing subsystem.
*/
void
GDS_ROUTING_init ()
{
routing_table = GNUNET_CONTAINER_multipeermap_create (DHT_MAX_RECENT * 4 / 3, GNUNET_NO);
}
/**
* Shutdown routing subsystem.
*/
void
GDS_ROUTING_done ()
{
GNUNET_assert (0 == GNUNET_CONTAINER_multipeermap_size (routing_table));
GNUNET_CONTAINER_multipeermap_destroy (routing_table);
}
/* end of gnunet-service-xdht_routing.c */
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