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/*
This file is part of GNUnet.
Copyright (C) 2014, 2017 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 cadet/gnunet-service-cadet_hello.c
* @brief spread knowledge about how to contact other peers from PEERINFO
* @author Bartlomiej Polot
* @author Christian Grothoff
*
* TODO:
* - is most of this necessary/helpful?
* - should we not simply restrict this to OUR hello?
*/
#include "platform.h"
#include "gnunet_util_lib.h"
#include "gnunet_statistics_service.h"
#include "gnunet_peerinfo_service.h"
#include "cadet_protocol.h"
#include "gnunet-service-cadet.h"
#include "gnunet-service-cadet_dht.h"
#include "gnunet-service-cadet_hello.h"
#include "gnunet-service-cadet_peer.h"
#define LOG(level, ...) GNUNET_log_from(level,"cadet-hll",__VA_ARGS__)
/**
* Hello message of local peer.
*/
static struct GNUNET_HELLO_Message *mine;
/**
* Handle to peerinfo service.
*/
static struct GNUNET_PEERINFO_Handle *peerinfo;
/**
* Iterator context.
*/
static struct GNUNET_PEERINFO_NotifyContext *nc;
/**
* Process each hello message received from peerinfo.
*
* @param cls Closure (unused).
* @param peer Identity of the peer.
* @param hello Hello of the peer.
* @param err_msg Error message.
*/
static void
got_hello (void *cls,
const struct GNUNET_PeerIdentity *id,
const struct GNUNET_HELLO_Message *hello,
const char *err_msg)
{
struct CadetPeer *peer;
if ( (NULL == id) ||
(NULL == hello) )
return;
if (0 == memcmp (id,
&my_full_id,
sizeof (struct GNUNET_PeerIdentity)))
{
GNUNET_free_non_null (mine);
mine = (struct GNUNET_HELLO_Message *) GNUNET_copy_message (&hello->header);
GCD_hello_update ();
return;
}
LOG (GNUNET_ERROR_TYPE_DEBUG,
"Hello for %s (%d bytes), expires on %s\n",
GNUNET_i2s (id),
GNUNET_HELLO_size (hello),
GNUNET_STRINGS_absolute_time_to_string (GNUNET_HELLO_get_last_expiration (hello)));
peer = GCP_get (id,
GNUNET_YES);
GCP_set_hello (peer,
hello);
}
/**
* Initialize the hello subsystem.
*
* @param c Configuration.
*/
void
GCH_init (const struct GNUNET_CONFIGURATION_Handle *c)
{
GNUNET_assert (NULL == nc);
peerinfo = GNUNET_PEERINFO_connect (c);
nc = GNUNET_PEERINFO_notify (c,
GNUNET_NO,
&got_hello,
NULL);
}
/**
* Shut down the hello subsystem.
*/
void
GCH_shutdown ()
{
if (NULL != nc)
{
GNUNET_PEERINFO_notify_cancel (nc);
nc = NULL;
}
if (NULL != peerinfo)
{
GNUNET_PEERINFO_disconnect (peerinfo);
peerinfo = NULL;
}
if (NULL != mine)
{
GNUNET_free (mine);
mine = NULL;
}
}
/**
* Get own hello message.
*
* @return Own hello message.
*/
const struct GNUNET_HELLO_Message *
GCH_get_mine (void)
{
return mine;
}
/* end of gnunet-service-cadet-new_hello.c */
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