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/*
This file is part of GNUnet.
(C) 2013 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.
*/
#include "platform.h"
#include "gnunet_util_lib.h"
#include "gnunet_dht_service.h"
#include "gnunet-service-mesh_dht.h"
#include "gnunet-service-mesh_peer.h"
#define MESH_DEBUG_DHT GNUNET_NO
#if MESH_DEBUG_DHT
#define DEBUG_DHT(...) GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, __VA_ARGS__)
#else
#define DEBUG_DHT(...)
#endif
/******************************************************************************/
/******************************** STRUCTS **********************************/
/******************************************************************************/
/******************************************************************************/
/******************************* GLOBALS ***********************************/
/******************************************************************************/
/**
* Handle to use DHT.
*/
static struct GNUNET_DHT_Handle *dht_handle;
/**
* How often to PUT own ID in the DHT.
*/
static struct GNUNET_TIME_Relative id_announce_time;
/**
* DHT replication level, see DHT API: GNUNET_DHT_get_start, GNUNET_DHT_put.
*/
static unsigned long long dht_replication_level;
/**
* Task to periodically announce itself in the network.
*/
static GNUNET_SCHEDULER_TaskIdentifier announce_id_task;
/**
* Own ID (full value).
*/
static struct GNUNET_PeerIdentity *id;
/**
* Own private key.
*/
static struct GNUNET_CRYPTO_EccPrivateKey *private_key;
/******************************************************************************/
/******************************** STATIC ***********************************/
/******************************************************************************/
/**
* Periodically announce self id in the DHT
*
* @param cls closure
* @param tc task context
*/
static void
announce_id (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
{
struct PBlock block;
struct GNUNET_HashCode phash;
if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
{
announce_id_task = GNUNET_SCHEDULER_NO_TASK;
return;
}
/* TODO
* - Set data expiration in function of X
* - Adapt X to churn
*/
DEBUG_DHT ("DHT_put for ID %s started.\n", GNUNET_i2s (&my_full_id));
block.id = my_full_id;
GNUNET_CRYPTO_hash (&my_full_id, sizeof (struct GNUNET_PeerIdentity), &phash);
GNUNET_DHT_put (dht_handle, /* DHT handle */
&phash, /* Key to use */
dht_replication_level, /* Replication level */
GNUNET_DHT_RO_RECORD_ROUTE | GNUNET_DHT_RO_DEMULTIPLEX_EVERYWHERE, /* DHT options */
GNUNET_BLOCK_TYPE_MESH_PEER, /* Block type */
sizeof (block), /* Size of the data */
(const char *) &block, /* Data itself */
GNUNET_TIME_UNIT_FOREVER_ABS, /* Data expiration */
GNUNET_TIME_UNIT_FOREVER_REL, /* Retry time */
NULL, /* Continuation */
NULL); /* Continuation closure */
announce_id_task =
GNUNET_SCHEDULER_add_delayed (id_announce_time, &announce_id, cls);
}
/******************************************************************************/
/******************************** API ***********************************/
/******************************************************************************/
/**
* Initialize the DHT subsystem.
*
* @param c Configuration.
*/
void
GMD_init (const struct GNUNET_CONFIGURATION_Handle *c)
{
if (GNUNET_OK !=
GNUNET_CONFIGURATION_get_value_number (c, "MESH", "DHT_REPLICATION_LEVEL",
&dht_replication_level))
{
GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_WARNING,
"MESH", "DHT_REPLICATION_LEVEL", "USING DEFAULT");
dht_replication_level = 3;
}
if (GNUNET_OK !=
GNUNET_CONFIGURATION_get_value_time (c, "MESH", "ID_ANNOUNCE_TIME",
&id_announce_time))
{
GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_ERROR,
"MESH", "ID_ANNOUNCE_TIME", "MISSING");
GNUNET_SCHEDULER_shutdown ();
return;
}
dht_handle = GNUNET_DHT_connect (c, 64);
if (NULL == dht_handle)
{
GNUNET_break (0);
}
announce_id_task = GNUNET_SCHEDULER_add_now (&announce_id, cls);
}
/**
* Shut down the DHT subsystem.
*/
void
GMD_shutdown(void )
{
if (dht_handle != NULL)
{
GNUNET_DHT_disconnect (dht_handle);
dht_handle = NULL;
}
if (GNUNET_SCHEDULER_NO_TASK != announce_id_task)
{
GNUNET_SCHEDULER_cancel (announce_id_task);
announce_id_task = GNUNET_SCHEDULER_NO_TASK;
}
}
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