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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.c
* @brief search for data in DHT
* @author Christian Grothoff
* @author Nathan Evans
*/
#include "platform.h"
#include "gnunet_dht_service.h"
/**
* The type of the query
*/
static unsigned int query_type;
/**
* Desired replication level
*/
static unsigned int replication = 5;
/**
* The key for the query
*/
static char *query_key;
/**
* User supplied timeout value
*/
static struct GNUNET_TIME_Relative timeout_request = { 60000 };
/**
* Be verbose
*/
static int verbose;
/**
* Use DHT demultixplex_everywhere
*/
static int demultixplex_everywhere;
/**
* Handle to the DHT
*/
static struct GNUNET_DHT_Handle *dht_handle;
/**
* Global handle of the configuration
*/
static const struct GNUNET_CONFIGURATION_Handle *cfg;
/**
* Handle for the get request
*/
static struct GNUNET_DHT_GetHandle *get_handle;
/**
* Count of results found
*/
static unsigned int result_count;
/**
* Global status value
*/
static int ret;
/**
* Task run to clean up on timeout.
*
* @param cls unused
* @param tc unused
*/
static void
cleanup_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
{
if (NULL != get_handle)
{
GNUNET_DHT_get_stop (get_handle);
get_handle = NULL;
}
if (NULL != dht_handle)
{
GNUNET_DHT_disconnect (dht_handle);
dht_handle = NULL;
}
}
/**
* Iterator called on each result obtained for a DHT
* operation that expects a reply
*
* @param cls closure
* @param exp when will this value expire
* @param key key of the result
* @param get_path peers on reply path (or NULL if not recorded)
* @param get_path_length number of entries in get_path
* @param put_path peers on the PUT path (or NULL if not recorded)
* @param put_path_length number of entries in get_path
* @param type type of the result
* @param size number of bytes in data
* @param data pointer to the result data
*/
static void
get_result_iterator (void *cls, struct GNUNET_TIME_Absolute exp,
const struct GNUNET_HashCode * key,
const struct GNUNET_PeerIdentity *get_path,
unsigned int get_path_length,
const struct GNUNET_PeerIdentity *put_path,
unsigned int put_path_length, enum GNUNET_BLOCK_Type type,
size_t size, const void *data)
{
FPRINTF (stdout,
_("Result %d, type %d:\n%.*s\n"),
result_count, type,
(unsigned int) size, (char *) data);
result_count++;
}
/**
* 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 c configuration
*/
static void
run (void *cls, char *const *args, const char *cfgfile,
const struct GNUNET_CONFIGURATION_Handle *c)
{
struct GNUNET_HashCode key;
cfg = c;
if (NULL == query_key)
{
FPRINTF (stderr, "%s", _("Must provide key for DHT GET!\n"));
ret = 1;
return;
}
if (NULL == (dht_handle = GNUNET_DHT_connect (cfg, 1)))
{
FPRINTF (stderr, "%s", _("Failed to connect to DHT service!\n"));
ret = 1;
return;
}
if (query_type == GNUNET_BLOCK_TYPE_ANY) /* Type of data not set */
query_type = GNUNET_BLOCK_TYPE_TEST;
GNUNET_CRYPTO_hash (query_key, strlen (query_key), &key);
if (verbose)
FPRINTF (stderr, "%s `%s' \n", _("Issueing DHT GET with key"), GNUNET_h2s_full (&key));
GNUNET_SCHEDULER_add_delayed (timeout_request,
&cleanup_task, NULL);
get_handle =
GNUNET_DHT_get_start (dht_handle, query_type, &key, replication,
(demultixplex_everywhere) ? GNUNET_DHT_RO_DEMULTIPLEX_EVERYWHERE : GNUNET_DHT_RO_NONE,
NULL, 0, &get_result_iterator, 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},
{'r', "replication", "LEVEL",
gettext_noop ("how many parallel requests (replicas) to create"),
1, &GNUNET_GETOPT_set_uint, &replication},
{'t', "type", "TYPE",
gettext_noop ("the type of data to look for"),
1, &GNUNET_GETOPT_set_uint, &query_type},
{'T', "timeout", "TIMEOUT",
gettext_noop ("how long to execute this query before giving up?"),
1, &GNUNET_GETOPT_set_relative_time, &timeout_request},
{'x', "demultiplex", NULL,
gettext_noop ("use DHT's demultiplex everywhere option"),
0, &GNUNET_GETOPT_set_one, &demultixplex_everywhere},
{'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
*
* @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)
{
if (GNUNET_OK != GNUNET_STRINGS_get_utf8_args (argc, argv, &argc, &argv))
return 2;
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;
}
/* end of gnunet-dht-get.c */
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