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/*
This file is part of GNUnet.
Copyright (C) 2011 GNUnet e.V.
GNUnet is free software: you can redistribute it and/or modify it
under the terms of the GNU Affero General Public License as published
by the Free Software Foundation, either version 3 of the License,
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
Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* @file dht/gnunet-service-dht_hello.c
* @brief GNUnet DHT integration with peerinfo
* @author Christian Grothoff
*
* TODO:
* - consider adding mechanism to remove expired HELLOs
*/
#include "platform.h"
#include "gnunet-service-dht.h"
#include "gnunet-service-dht_hello.h"
#include "gnunet_peerinfo_service.h"
/**
* Handle for peerinfo notifications.
*/
static struct GNUNET_PEERINFO_NotifyContext *pnc;
/**
* Hash map of peers to HELLOs.
*/
static struct GNUNET_CONTAINER_MultiPeerMap *peer_to_hello;
/**
* Obtain a peer's HELLO if available
*
* @param peer peer to look for a HELLO from
* @return HELLO for the given peer
*/
const struct GNUNET_HELLO_Message *
GDS_HELLO_get (const struct GNUNET_PeerIdentity *peer)
{
if (NULL == peer_to_hello)
return NULL;
return GNUNET_CONTAINER_multipeermap_get (peer_to_hello, peer);
}
/**
* Function called for each HELLO known to PEERINFO.
*
* @param cls closure
* @param peer id of the peer, NULL for last call
* @param hello hello message for the peer (can be NULL)
* @param err_msg error message (not used)
*
* FIXME this is called once per address. Merge instead of replacing?
*/
static void
process_hello (void *cls,
const struct GNUNET_PeerIdentity *peer,
const struct GNUNET_HELLO_Message *hello,
const char *err_msg)
{
struct GNUNET_TIME_Absolute ex;
struct GNUNET_HELLO_Message *hm;
if (NULL == hello)
return;
ex = GNUNET_HELLO_get_last_expiration (hello);
if (0 == GNUNET_TIME_absolute_get_remaining (ex).rel_value_us)
return;
GNUNET_STATISTICS_update (GDS_stats,
gettext_noop ("# HELLOs obtained from peerinfo"), 1,
GNUNET_NO);
hm = GNUNET_CONTAINER_multipeermap_get (peer_to_hello, peer);
GNUNET_free_non_null (hm);
hm = GNUNET_malloc (GNUNET_HELLO_size (hello));
GNUNET_memcpy (hm, hello, GNUNET_HELLO_size (hello));
GNUNET_assert (GNUNET_SYSERR !=
GNUNET_CONTAINER_multipeermap_put (peer_to_hello,
peer, hm,
GNUNET_CONTAINER_MULTIHASHMAPOPTION_REPLACE));
}
/**
* Initialize HELLO subsystem.
*/
void
GDS_HELLO_init ()
{
pnc = GNUNET_PEERINFO_notify (GDS_cfg,
GNUNET_NO,
&process_hello,
NULL);
peer_to_hello = GNUNET_CONTAINER_multipeermap_create (256,
GNUNET_NO);
}
/**
* Free memory occopied by the HELLO.
*/
static int
free_hello (void *cls,
const struct GNUNET_PeerIdentity *key,
void *hello)
{
GNUNET_free (hello);
return GNUNET_OK;
}
/**
* Shutdown HELLO subsystem.
*/
void
GDS_HELLO_done ()
{
if (NULL != pnc)
{
GNUNET_PEERINFO_notify_cancel (pnc);
pnc = NULL;
}
if (NULL != peer_to_hello)
{
GNUNET_CONTAINER_multipeermap_iterate (peer_to_hello,
&free_hello,
NULL);
GNUNET_CONTAINER_multipeermap_destroy (peer_to_hello);
}
}
/* end of gnunet-service-dht_hello.c */
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