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/*
This file is part of GNUnet.
(C) 2011, 2012 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 core/gnunet-core.c
* @brief Print information about other known _connected_ peers.
* @author Nathan Evans
*/
#include "platform.h"
#include "gnunet_crypto_lib.h"
#include "gnunet_configuration_lib.h"
#include "gnunet_getopt_lib.h"
#include "gnunet_peerinfo_service.h"
#include "gnunet_transport_service.h"
#include "gnunet_core_service.h"
#include "gnunet_program_lib.h"
/**
* Option -m.
*/
static int monitor_connections;
/**
* Current number of connections in monitor mode
*/
static int monitor_connections_counter;
static struct GNUNET_CORE_Handle *ch;
static struct GNUNET_PeerIdentity my_id;
/**
* Task run in monitor mode when the user presses CTRL-C to abort.
* Stops monitoring activity.
*
* @param cls the 'struct GNUNET_TRANSPORT_PeerIterateContext *'
* @param tc scheduler context
*/
static void
shutdown_task (void *cls,
const struct GNUNET_SCHEDULER_TaskContext *tc)
{
if (NULL != ch)
{
GNUNET_CORE_disconnect (ch);
ch = NULL;
}
}
/**
* Callback for retrieving a list of connected peers.
*
* @param cls closure (unused)
* @param peer peer identity this notification is about
*/
static void
connected_peer_callback (void *cls,
const struct GNUNET_PeerIdentity *peer)
{
if (NULL == peer)
return;
printf (_("Peer `%s'\n"),
GNUNET_i2s_full (peer));
}
static void
monitor_notify_startup (void *cls,
const struct GNUNET_PeerIdentity *my_identity)
{
my_id = (*my_identity);
}
/**
* Function called to notify core users that another
* peer connected to us.
*
* @param cls closure
* @param peer the peer that connected
*/
static void
monitor_notify_connect (void *cls, const struct GNUNET_PeerIdentity *peer)
{
struct GNUNET_TIME_Absolute now = GNUNET_TIME_absolute_get();
const char *now_str;
if (0 != memcmp (&my_id, peer, sizeof (my_id)))
{
monitor_connections_counter ++;
now_str = GNUNET_STRINGS_absolute_time_to_string (now);
FPRINTF (stdout, _("%24s: %-17s %4s (%u connections in total)\n"),
now_str,
_("Connected to"),
GNUNET_i2s (peer),
monitor_connections_counter);
}
}
/**
* Function called to notify core users that another
* peer disconnected from us.
*
* @param cls closure
* @param peer the peer that disconnected
*/
static void
monitor_notify_disconnect (void *cls, const struct GNUNET_PeerIdentity *peer)
{
struct GNUNET_TIME_Absolute now = GNUNET_TIME_absolute_get();
const char *now_str;
if (0 != memcmp (&my_id, peer, sizeof (my_id)))
{
now_str = GNUNET_STRINGS_absolute_time_to_string (now);
GNUNET_assert (monitor_connections_counter > 0);
monitor_connections_counter--;
FPRINTF (stdout, _("%24s: %-17s %4s (%u connections in total)\n"),
now_str,
_("Disconnected from"),
GNUNET_i2s (peer),
monitor_connections_counter);
}
}
/**
* Main function that will be run by the scheduler.
*
* @param cls closure
* @param args remaining command-line arguments
* @param cfgfile name of the configuration file used (for saving, can be NULL!)
* @param cfg configuration
*/
static void
run (void *cls, char *const *args, const char *cfgfile,
const struct GNUNET_CONFIGURATION_Handle *cfg)
{
static const struct GNUNET_CORE_MessageHandler handlers[] = {
{NULL, 0, 0}
};
if (args[0] != NULL)
{
FPRINTF (stderr, _("Invalid command line argument `%s'\n"), args[0]);
return;
}
if (GNUNET_NO == monitor_connections)
GNUNET_CORE_iterate_peers (cfg, &connected_peer_callback, NULL);
else
{
memset(&my_id, '\0', sizeof (my_id));
ch = GNUNET_CORE_connect (cfg, NULL,
monitor_notify_startup,
monitor_notify_connect,
monitor_notify_disconnect,
NULL, GNUNET_NO,
NULL, GNUNET_NO,
handlers);
if (NULL == ch)
GNUNET_SCHEDULER_add_now (shutdown_task, NULL);
else
GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL, shutdown_task, NULL);
}
}
/**
* The main function to obtain peer information.
*
* @param argc number of arguments from the command line
* @param argv command line arguments
* @return 0 ok, 1 on error
*/
int
main (int argc, char *const *argv)
{
int res;
static const struct GNUNET_GETOPT_CommandLineOption options[] = {
{'m', "monitor", NULL,
gettext_noop ("provide information about all current connections (continuously)"),
0, &GNUNET_GETOPT_set_one, &monitor_connections},
GNUNET_GETOPT_OPTION_END
};
if (GNUNET_OK != GNUNET_STRINGS_get_utf8_args (argc, argv, &argc, &argv))
return 2;
res = GNUNET_PROGRAM_run (argc, argv, "gnunet-core",
gettext_noop
("Print information about connected peers."),
options, &run, NULL);
GNUNET_free ((void *) argv);
if (GNUNET_OK == res)
return 0;
else
return 1;
}
/* end of gnunet-core.c */
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