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.
10 GNUnet is distributed in the hope that it will be useful, but
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,
18 Boston, MA 02111-1307, USA.
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;
60 * Global handle of the scheduler
62 static struct GNUNET_SCHEDULER_Handle *sched;
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;
85 shutdown_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
88 if (dht_handle != NULL)
89 GNUNET_DHT_disconnect (dht_handle);
95 cleanup_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
97 if (get_handle != NULL)
98 GNUNET_DHT_get_stop (get_handle, &shutdown_task, NULL);
100 GNUNET_SCHEDULER_add_now (sched, &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 type type of the result
112 * @param size number of bytes in data
113 * @param data pointer to the result data
116 get_result_iterator (void *cls,
117 struct GNUNET_TIME_Absolute exp,
118 const GNUNET_HashCode * key,
119 uint32_t type, uint32_t size, const void *data)
121 fprintf (stdout, "Result %d, type %d:\n%.*s\n", result_count, type, size,
127 * Signature of the main function of a task.
130 * @param tc context information (why was this task triggered now)
133 message_sent_cont (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
135 if (tc->reason == GNUNET_SCHEDULER_REASON_TIMEOUT)
139 "Failed to send GET request to service, quitting.\n");
141 GNUNET_SCHEDULER_add_now (sched, &shutdown_task, NULL);
146 fprintf (stderr, "GET request sent, awaiting results!\n");
147 GNUNET_SCHEDULER_add_delayed (sched,
148 GNUNET_TIME_absolute_get_remaining
149 (absolute_timeout), &cleanup_task, NULL);
154 * Main function that will be run by the scheduler.
157 * @param s the scheduler to use
158 * @param args remaining command-line arguments
159 * @param cfgfile name of the configuration file used (for saving, can be NULL!)
160 * @param c configuration
164 struct GNUNET_SCHEDULER_Handle *s,
166 const char *cfgfile, const struct GNUNET_CONFIGURATION_Handle *c)
168 struct GNUNET_TIME_Relative timeout;
173 if (query_key == NULL)
176 fprintf (stderr, "Must provide key for DHT GET!\n");
181 dht_handle = GNUNET_DHT_connect (sched, cfg, 1);
183 if (dht_handle == NULL)
186 fprintf (stderr, "Couldn't connect to DHT service!\n");
191 fprintf (stderr, "Connected to DHT service!\n");
193 GNUNET_CRYPTO_hash (query_key, strlen (query_key), &key);
196 GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, timeout_request);
197 absolute_timeout = GNUNET_TIME_relative_to_absolute (timeout);
200 fprintf (stderr, "Issuing GET request for %s!\n", query_key);
201 get_handle = GNUNET_DHT_get_start (dht_handle, timeout, query_type, &key,
202 &get_result_iterator, NULL, &message_sent_cont, NULL);
208 * gnunet-dht-get command line options
210 static struct GNUNET_GETOPT_CommandLineOption options[] = {
212 gettext_noop ("the query key"),
213 1, &GNUNET_GETOPT_set_string, &query_key},
214 {'t', "type", "TYPE",
215 gettext_noop ("the type of data to look for"),
216 1, &GNUNET_GETOPT_set_uint, &query_type},
217 {'T', "timeout", "TIMEOUT",
218 gettext_noop ("how long to execute this query before giving up?"),
219 1, &GNUNET_GETOPT_set_ulong, &timeout_request},
220 {'V', "verbose", NULL,
221 gettext_noop ("be verbose (print progress information)"),
222 0, &GNUNET_GETOPT_set_one, &verbose},
223 GNUNET_GETOPT_OPTION_END
228 * Entry point for gnunet-dht-get
230 * @param argc number of arguments from the command line
231 * @param argv command line arguments
232 * @return 0 ok, 1 on error
235 main (int argc, char *const *argv)
238 GNUNET_PROGRAM_run (argc,
242 ("Issue a GET request to the GNUnet DHT, prints results."),
243 options, &run, NULL)) ? ret : 1;