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 * The key for the query
37 static char *query_key;
40 * User supplied timeout value (in seconds)
42 static unsigned long long timeout_request = 5;
45 * When this request should really die
47 struct GNUNET_TIME_Absolute absolute_timeout;
57 static struct GNUNET_DHT_Handle *dht_handle;
61 * Global handle of the configuration
63 static const struct GNUNET_CONFIGURATION_Handle *cfg;
66 * Handle for the get request
68 static struct GNUNET_DHT_GetHandle *get_handle;
71 * Count of results found
73 static unsigned int result_count;
82 shutdown_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
84 if (dht_handle != NULL)
86 GNUNET_DHT_disconnect (dht_handle);
93 cleanup_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
95 if (get_handle != NULL)
97 GNUNET_DHT_get_stop (get_handle);
100 GNUNET_SCHEDULER_add_now (&shutdown_task, NULL);
105 * Iterator called on each result obtained for a DHT
106 * operation that expects a reply
109 * @param exp when will this value expire
110 * @param key key of the result
111 * @param get_path NULL-terminated array of pointers
112 * to the peers on reverse GET path (or NULL if not recorded)
113 * @param put_path NULL-terminated array of pointers
114 * to the peers on the PUT path (or NULL if not recorded)
115 * @param type type of the result
116 * @param size number of bytes in data
117 * @param data pointer to the result data
120 get_result_iterator (void *cls,
121 struct GNUNET_TIME_Absolute exp,
122 const GNUNET_HashCode * key,
123 const struct GNUNET_PeerIdentity * const *get_path,
124 const struct GNUNET_PeerIdentity * const *put_path,
125 enum GNUNET_BLOCK_Type type,
129 fprintf (stdout, "Result %d, type %d:\n%.*s\n",
138 * Main function that will be run by the scheduler.
141 * @param args remaining command-line arguments
142 * @param cfgfile name of the configuration file used (for saving, can be NULL!)
143 * @param c configuration
148 const char *cfgfile, const struct GNUNET_CONFIGURATION_Handle *c)
150 struct GNUNET_TIME_Relative timeout;
154 if (query_key == NULL)
157 fprintf (stderr, "Must provide key for DHT GET!\n");
162 dht_handle = GNUNET_DHT_connect (cfg, 1);
164 if (dht_handle == NULL)
167 fprintf (stderr, "Couldn't connect to DHT service!\n");
172 fprintf (stderr, "Connected to DHT service!\n");
174 GNUNET_CRYPTO_hash (query_key, strlen (query_key), &key);
177 GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, timeout_request);
178 absolute_timeout = GNUNET_TIME_relative_to_absolute (timeout);
181 fprintf (stderr, "Issuing GET request for %s!\n", query_key);
182 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_absolute_get_remaining
183 (absolute_timeout), &cleanup_task, NULL);
184 get_handle = GNUNET_DHT_get_start (dht_handle,
188 DEFAULT_GET_REPLICATION,
192 &get_result_iterator, NULL);
198 * gnunet-dht-get command line options
200 static struct GNUNET_GETOPT_CommandLineOption options[] = {
202 gettext_noop ("the query key"),
203 1, &GNUNET_GETOPT_set_string, &query_key},
204 {'t', "type", "TYPE",
205 gettext_noop ("the type of data to look for"),
206 1, &GNUNET_GETOPT_set_uint, &query_type},
207 {'T', "timeout", "TIMEOUT",
208 gettext_noop ("how long to execute this query before giving up?"),
209 1, &GNUNET_GETOPT_set_ulong, &timeout_request},
210 {'V', "verbose", NULL,
211 gettext_noop ("be verbose (print progress information)"),
212 0, &GNUNET_GETOPT_set_one, &verbose},
213 GNUNET_GETOPT_OPTION_END
218 * Entry point for gnunet-dht-get
220 * @param argc number of arguments from the command line
221 * @param argv command line arguments
222 * @return 0 ok, 1 on error
225 main (int argc, char *const *argv)
228 GNUNET_PROGRAM_run (argc,
232 ("Issue a GET request to the GNUnet DHT, prints results."),
233 options, &run, NULL)) ? ret : 1;
236 /* end of gnunet-dht-get.c */