2 This file is part of GNUnet.
3 (C) 2001, 2002, 2004, 2005, 2006, 2007, 2009 Christian Grothoff (and other contributing authors)
5 GNUnet is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 3, or (at your
8 option) any later version.
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11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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21 * @file dht/gnunet-dht-get.c
22 * @brief search for data in DHT
23 * @author Christian Grothoff
24 * @author Nathan Evans
27 #include "gnunet_dht_service.h"
30 * The type of the query
32 static unsigned int query_type;
35 * Desired replication level
37 static unsigned int replication = 5;
40 * The key for the query
42 static char *query_key;
45 * User supplied timeout value (in seconds)
47 static unsigned long long timeout_request = 5;
50 * When this request should really die
52 struct GNUNET_TIME_Absolute absolute_timeout;
62 static struct GNUNET_DHT_Handle *dht_handle;
65 * Global handle of the configuration
67 static const struct GNUNET_CONFIGURATION_Handle *cfg;
70 * Handle for the get request
72 static struct GNUNET_DHT_GetHandle *get_handle;
75 * Count of results found
77 static unsigned int result_count;
86 shutdown_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
88 if (dht_handle != NULL)
90 GNUNET_DHT_disconnect (dht_handle);
97 cleanup_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
99 if (get_handle != NULL)
101 GNUNET_DHT_get_stop (get_handle);
104 GNUNET_SCHEDULER_add_now (&shutdown_task, NULL);
109 * Iterator called on each result obtained for a DHT
110 * operation that expects a reply
113 * @param exp when will this value expire
114 * @param key key of the result
115 * @param get_path peers on reply path (or NULL if not recorded)
116 * @param get_path_length number of entries in get_path
117 * @param put_path peers on the PUT path (or NULL if not recorded)
118 * @param put_path_length number of entries in get_path
119 * @param type type of the result
120 * @param size number of bytes in data
121 * @param data pointer to the result data
124 get_result_iterator (void *cls, struct GNUNET_TIME_Absolute exp,
125 const GNUNET_HashCode * key,
126 const struct GNUNET_PeerIdentity *get_path,
127 unsigned int get_path_length,
128 const struct GNUNET_PeerIdentity *put_path,
129 unsigned int put_path_length, enum GNUNET_BLOCK_Type type,
130 size_t size, const void *data)
132 FPRINTF (stdout, "Result %d, type %d:\n%.*s\n", result_count, type,
133 (unsigned int) size, (char *) data);
139 * Main function that will be run by the scheduler.
142 * @param args remaining command-line arguments
143 * @param cfgfile name of the configuration file used (for saving, can be NULL!)
144 * @param c configuration
147 run (void *cls, char *const *args, const char *cfgfile,
148 const struct GNUNET_CONFIGURATION_Handle *c)
150 struct GNUNET_TIME_Relative timeout;
155 if (query_key == NULL)
158 FPRINTF (stderr, "%s", "Must provide key for DHT GET!\n");
163 dht_handle = GNUNET_DHT_connect (cfg, 1);
165 if (dht_handle == NULL)
168 FPRINTF (stderr, "%s", "Couldn't connect to DHT service!\n");
173 FPRINTF (stderr, "%s", "Connected to DHT service!\n");
175 if (query_type == GNUNET_BLOCK_TYPE_ANY) /* Type of data not set */
176 query_type = GNUNET_BLOCK_TYPE_TEST;
178 GNUNET_CRYPTO_hash (query_key, strlen (query_key), &key);
181 GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, timeout_request);
182 absolute_timeout = GNUNET_TIME_relative_to_absolute (timeout);
185 FPRINTF (stderr, "Issuing GET request for %s!\n", query_key);
186 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_absolute_get_remaining
187 (absolute_timeout), &cleanup_task, NULL);
189 GNUNET_DHT_get_start (dht_handle, timeout, query_type, &key, replication,
190 GNUNET_DHT_RO_NONE, NULL, 0, &get_result_iterator,
197 * gnunet-dht-get command line options
199 static struct GNUNET_GETOPT_CommandLineOption options[] = {
201 gettext_noop ("the query key"),
202 1, &GNUNET_GETOPT_set_string, &query_key},
203 {'r', "replication", "LEVEL",
204 gettext_noop ("how many parallel requests (replicas) to create"),
205 1, &GNUNET_GETOPT_set_uint, &replication},
206 {'t', "type", "TYPE",
207 gettext_noop ("the type of data to look for"),
208 1, &GNUNET_GETOPT_set_uint, &query_type},
209 {'T', "timeout", "TIMEOUT",
210 gettext_noop ("how long to execute this query before giving up?"),
211 1, &GNUNET_GETOPT_set_ulong, &timeout_request},
212 {'V', "verbose", NULL,
213 gettext_noop ("be verbose (print progress information)"),
214 0, &GNUNET_GETOPT_set_one, &verbose},
215 GNUNET_GETOPT_OPTION_END
220 * Entry point for gnunet-dht-get
222 * @param argc number of arguments from the command line
223 * @param argv command line arguments
224 * @return 0 ok, 1 on error
227 main (int argc, char *const *argv)
230 GNUNET_PROGRAM_run (argc, argv, "gnunet-dht-get",
232 ("Issue a GET request to the GNUnet DHT, prints results."),
233 options, &run, NULL)) ? ret : 1;
236 /* end of gnunet-dht-get.c */