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/*
This file is part of GNUnet.
(C) 2001, 2002, 2004, 2005, 2006, 2007, 2009 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 dht/gnunet-dht-get-peer.c
* @brief search for peers close to key using the DHT
* @author Christian Grothoff
* @author Nathan Evans
*/
#include "platform.h"
#include "gnunet_dht_service.h"
#include "gnunet_hello_lib.h"
/**
* The key for the query
*/
static char *query_key;
/**
* User supplied timeout value (in seconds)
*/
static unsigned long long timeout_request = 5;
/**
* When this request should really die
*/
struct GNUNET_TIME_Absolute absolute_timeout;
/**
* Be verbose
*/
static int verbose;
/**
* Handle to the DHT
*/
static struct GNUNET_DHT_Handle *dht_handle;
/**
* Global handle of the scheduler
*/
static struct GNUNET_SCHEDULER_Handle *sched;
/**
* Global handle of the configuration
*/
static const struct GNUNET_CONFIGURATION_Handle *cfg;
/**
* Handle for the request
*/
static struct GNUNET_DHT_FindPeerHandle *find_peer_handle;
/**
* Count of results found
*/
static unsigned int result_count;
/**
* Global status value
*/
static int ret;
static void
shutdown_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
{
if (dht_handle != NULL)
GNUNET_DHT_disconnect (dht_handle);
dht_handle = NULL;
}
static void
cleanup_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
{
if (find_peer_handle != NULL)
GNUNET_DHT_find_peer_stop (find_peer_handle, &shutdown_task, NULL);
else
GNUNET_SCHEDULER_add_now (sched, &shutdown_task, NULL);
}
/**
* Iterator called on each result obtained from a find peer
* operation
*
* @param cls closure (NULL)
* @param hello the response message, a HELLO
*/
void find_peer_processor (void *cls,
const struct GNUNET_HELLO_Message *hello)
{
struct GNUNET_PeerIdentity peer;
if (GNUNET_OK == GNUNET_HELLO_get_id(hello, &peer))
{
result_count++;
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"test_find_peer_processor called (peer `%s'), total results %d!\n", GNUNET_i2s(&peer), result_count);
}
}
/**
* Signature of the main function of a task.
*
* @param cls closure
* @param tc context information (why was this task triggered now)
*/
void
message_sent_cont (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
{
if (tc->reason == GNUNET_SCHEDULER_REASON_TIMEOUT)
{
if (verbose)
fprintf (stderr,
"Failed to send FIND PEER request to service, quitting.\n");
ret = 1;
GNUNET_SCHEDULER_add_now (sched, &shutdown_task, NULL);
}
else
{
if (verbose)
fprintf (stderr, "FIND PEER request sent, awaiting results!\n");
GNUNET_SCHEDULER_add_delayed (sched,
GNUNET_TIME_absolute_get_remaining
(absolute_timeout), &cleanup_task, NULL);
}
}
/**
* Main function that will be run by the scheduler.
*
* @param cls closure
* @param s the scheduler to use
* @param args remaining command-line arguments
* @param cfgfile name of the configuration file used (for saving, can be NULL!)
* @param c configuration
*/
static void
run (void *cls,
struct GNUNET_SCHEDULER_Handle *s,
char *const *args,
const char *cfgfile, const struct GNUNET_CONFIGURATION_Handle *c)
{
struct GNUNET_TIME_Relative timeout;
GNUNET_HashCode key;
sched = s;
cfg = c;
if (query_key == NULL)
{
if (verbose)
fprintf (stderr, "Must provide key for DHT GET!\n");
ret = 1;
return;
}
dht_handle = GNUNET_DHT_connect (sched, cfg, 1);
if (dht_handle == NULL)
{
if (verbose)
fprintf (stderr, "Couldn't connect to DHT service!\n");
ret = 1;
return;
}
else if (verbose)
fprintf (stderr, "Connected to DHT service!\n");
GNUNET_CRYPTO_hash (query_key, strlen (query_key), &key);
timeout =
GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, timeout_request);
absolute_timeout = GNUNET_TIME_relative_to_absolute (timeout);
if (verbose)
fprintf (stderr, "Issuing FIND PEER request for %s!\n", query_key);
find_peer_handle = GNUNET_DHT_find_peer_start (dht_handle,
timeout,
0,
&key,
&find_peer_processor,
NULL,
&message_sent_cont,
NULL);
}
/**
* gnunet-dht-get command line options
*/
static struct GNUNET_GETOPT_CommandLineOption options[] = {
{'k', "key", "KEY",
gettext_noop ("the query key"),
1, &GNUNET_GETOPT_set_string, &query_key},
{'T', "timeout", "TIMEOUT",
gettext_noop ("how long to execute this query before giving up?"),
1, &GNUNET_GETOPT_set_ulong, &timeout_request},
{'V', "verbose", NULL,
gettext_noop ("be verbose (print progress information)"),
0, &GNUNET_GETOPT_set_one, &verbose},
GNUNET_GETOPT_OPTION_END
};
/**
* Entry point for gnunet-dht-get-peer
*
* @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)
{
return (GNUNET_OK ==
GNUNET_PROGRAM_run (argc,
argv,
"gnunet-dht-get",
gettext_noop
("Issue a GET request to the GNUnet DHT, prints results."),
options, &run, NULL)) ? ret : 1;
}
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