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/*
This file is part of GNUnet.
Copyright (C)
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.
*/
/**
* @file rps/gnunet-rps.c
* @brief random peer sampling
* @author Julius Bünger
*/
#include "platform.h"
#include "gnunet_util_lib.h"
#include "gnunet_rps_service.h"
#include <inttypes.h>
static int ret;
/**
* RPS handle
*/
static struct GNUNET_RPS_Handle *rps_handle;
/**
* Request handle
*/
static struct GNUNET_RPS_Request_Handle *req_handle;
/**
* PeerID (Option --seed)
*/
static struct GNUNET_PeerIdentity peer_id;
/**
* @brief Do we want to receive updates of the view? (Option --view)
*/
static int view_update;
/**
* @brief Number of updates we want to receive
*/
static uint64_t num_view_updates;
/**
* Task run when user presses CTRL-C to abort.
* Cancels pending request and disconnects.
*
* @param cls NULL
*/
static void
do_shutdown (void *cls)
{
if (NULL != req_handle)
GNUNET_RPS_request_cancel (req_handle);
GNUNET_RPS_disconnect (rps_handle);
}
/**
* Callback called on receipt of reply.
* Prints replied PeerIDs.
*
* @param cls closure
* @param n number of peers
* @param recv_peers the received peers
*/
static void
reply_handle (void *cls,
uint64_t n,
const struct GNUNET_PeerIdentity *recv_peers)
{
uint64_t i;
req_handle = NULL;
for (i = 0; i < n; i++)
{
FPRINTF (stdout, "%s\n",
GNUNET_i2s_full (&recv_peers[i]));
}
ret = 0;
GNUNET_SCHEDULER_shutdown ();
}
/**
* Callback called on receipt view update.
* Prints view.
*
* @param n number of peers
* @param recv_peers the received peers
*/
static void
view_update_handle (void *cls,
uint64_t n,
const struct GNUNET_PeerIdentity *recv_peers)
{
uint64_t i;
if (0 == n)
{
FPRINTF (stdout, "Empty view\n");
}
req_handle = NULL;
for (i = 0; i < n; i++)
{
FPRINTF (stdout, "%s\n",
GNUNET_i2s_full (&recv_peers[i]));
}
if (1 == num_view_updates)
{
ret = 0;
GNUNET_SCHEDULER_shutdown ();
}
else if (1 < num_view_updates)
{
num_view_updates--;
}
}
/**
* 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 uint64_t num_peers;
static struct GNUNET_PeerIdentity zero_pid;
rps_handle = GNUNET_RPS_connect (cfg);
if ((0 == memcmp (&zero_pid, &peer_id, sizeof (peer_id))) &&
(!view_update))
{ /* Request n PeerIDs */
/* If number was specified use it, else request single peer. */
num_peers = (NULL == args[0]) ? 1 : atoi (args[0]);
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"Requesting %" PRIu64 " PeerIDs\n", num_peers);
req_handle = GNUNET_RPS_request_peers (rps_handle, num_peers, reply_handle, NULL);
GNUNET_SCHEDULER_add_shutdown (&do_shutdown, NULL);
} else if (view_update)
{
/* Get updates of view */
num_view_updates = (NULL == args[0]) ? 0 : atoi (args[0]);
GNUNET_RPS_view_request (rps_handle, num_view_updates, view_update_handle, NULL);
if (0 != num_view_updates)
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"Requesting %" PRIu64 " view updates\n", num_view_updates);
else
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"Requesting contiuous view updates\n");
GNUNET_SCHEDULER_add_shutdown (&do_shutdown, NULL);
}
else
{ /* Seed PeerID */
GNUNET_RPS_seed_ids (rps_handle, 1, &peer_id);
FPRINTF (stdout, "Seeded PeerID %s\n", GNUNET_i2s_full (&peer_id));
ret = 0;
GNUNET_SCHEDULER_add_now (&do_shutdown, NULL);
}
}
/**
* The main function to rps.
*
* @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)
{
const char helpstr[] =
"Get random GNUnet peers. If none is specified a single is requested.";
struct GNUNET_GETOPT_CommandLineOption options[] = {
GNUNET_GETOPT_option_base32_auto ('s',
"seed",
"PEER_ID",
gettext_noop ("Seed a PeerID"),
&peer_id),
GNUNET_GETOPT_option_flag ('V',
"view",
gettext_noop ("Get updates of view (0 for infinite updates)"),
&view_update),
GNUNET_GETOPT_OPTION_END
};
return (GNUNET_OK ==
GNUNET_PROGRAM_run (argc,
argv,
"gnunet-rps [NUMBER_OF_PEERS]",
gettext_noop
(helpstr),
options, &run, NULL)) ? ret : 1;
}
/* end of gnunet-rps.c */
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