aboutsummaryrefslogtreecommitdiff
path: root/src/cadet/gnunet-service-cadet_dht.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/cadet/gnunet-service-cadet_dht.c')
-rw-r--r--src/cadet/gnunet-service-cadet_dht.c331
1 files changed, 0 insertions, 331 deletions
diff --git a/src/cadet/gnunet-service-cadet_dht.c b/src/cadet/gnunet-service-cadet_dht.c
deleted file mode 100644
index 576753a38..000000000
--- a/src/cadet/gnunet-service-cadet_dht.c
+++ /dev/null
@@ -1,331 +0,0 @@
1/*
2 This file is part of GNUnet.
3 Copyright (C) 2013, 2017 GNUnet e.V.
4
5 GNUnet is free software: you can redistribute it and/or modify it
6 under the terms of the GNU Affero General Public License as published
7 by the Free Software Foundation, either version 3 of the License,
8 or (at your option) any later version.
9
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 Affero General Public License for more details.
14
15 You should have received a copy of the GNU Affero General Public License
16 along with this program. If not, see <http://www.gnu.org/licenses/>.
17
18 SPDX-License-Identifier: AGPL3.0-or-later
19 */
20/**
21 * @file cadet/gnunet-service-cadet_dht.c
22 * @brief Information we track per peer.
23 * @author Bartlomiej Polot
24 * @author Christian Grothoff
25 */
26
27#include "platform.h"
28#include "gnunet_util_lib.h"
29#include "gnunet_dht_service.h"
30#include "gnunet_statistics_service.h"
31#include "gnunet-service-cadet.h"
32#include "gnunet-service-cadet_dht.h"
33#include "gnunet-service-cadet_hello.h"
34#include "gnunet-service-cadet_peer.h"
35#include "gnunet-service-cadet_paths.h"
36
37/**
38 * How long do we wait before first announcing our presence to the DHT.
39 * Used to wait for our HELLO to be available. Note that we also get
40 * notifications when our HELLO is ready, so this is just the maximum
41 * we wait for the first notification.
42 */
43#define STARTUP_DELAY GNUNET_TIME_relative_multiply ( \
44 GNUNET_TIME_UNIT_MILLISECONDS, 500)
45
46/**
47 * How long do we wait after we get an updated HELLO before publishing?
48 * Allows for the HELLO to be updated again quickly, for example in
49 * case multiple addresses changed and we got a partial update.
50 */
51#define CHANGE_DELAY GNUNET_TIME_relative_multiply ( \
52 GNUNET_TIME_UNIT_MILLISECONDS, 100)
53
54
55#define LOG(level, ...) GNUNET_log_from (level, "cadet-dht", __VA_ARGS__)
56
57
58struct GCD_search_handle
59{
60 /**
61 * DHT_GET handle.
62 */
63 struct GNUNET_DHT_GetHandle *dhtget;
64};
65
66
67/**
68 * Handle to use DHT.
69 */
70static struct GNUNET_DHT_Handle *dht_handle;
71
72/**
73 * How often to PUT own ID in the DHT.
74 */
75static struct GNUNET_TIME_Relative id_announce_time;
76
77/**
78 * DHT replication level, see DHT API: #GNUNET_DHT_get_start(), #GNUNET_DHT_put().
79 */
80static unsigned long long dht_replication_level;
81
82/**
83 * Task to periodically announce itself in the network.
84 */
85static struct GNUNET_SCHEDULER_Task *announce_id_task;
86
87/**
88 * Delay for the next ID announce.
89 */
90static struct GNUNET_TIME_Relative announce_delay;
91
92
93/**
94 * Function to process paths received for a new peer addition. The recorded
95 * paths form the initial tunnel, which can be optimized later.
96 * Called on each result obtained for the DHT search.
97 *
98 * @param cls closure
99 * @param exp when will this value expire
100 * @param key key of the result
101 * @param trunc_peer peer preceeding with invalid signature, or NULL
102 * @param get_path path of the get request
103 * @param get_path_length length of @a get_path
104 * @param put_path path of the put request
105 * @param put_path_length length of the @a put_path
106 * @param type type of the result
107 * @param size number of bytes in data
108 * @param data pointer to the result data
109 */
110static void
111dht_get_id_handler (void *cls, struct GNUNET_TIME_Absolute exp,
112 const struct GNUNET_HashCode *key,
113 const struct GNUNET_PeerIdentity *trunc_peer,
114 const struct GNUNET_DHT_PathElement *get_path,
115 unsigned int get_path_length,
116 const struct GNUNET_DHT_PathElement *put_path,
117 unsigned int put_path_length,
118 enum GNUNET_BLOCK_Type type,
119 size_t size,
120 const void *data)
121{
122 const struct GNUNET_HELLO_Message *hello = data;
123
124 (void) trunc_peer;
125 GCPP_try_path_from_dht (get_path,
126 get_path_length,
127 put_path,
128 put_path_length);
129 if ((size >= sizeof(struct GNUNET_HELLO_Message)) &&
130 (ntohs (hello->header.size) == size) &&
131 (size == GNUNET_HELLO_size (hello)))
132 {
133 struct CadetPeer *peer;
134
135 peer = GCP_get (&put_path[0].pred,
136 GNUNET_YES);
137 LOG (GNUNET_ERROR_TYPE_DEBUG,
138 "Got HELLO for %s\n",
139 GCP_2s (peer));
140 GCP_set_hello (peer,
141 hello);
142 }
143}
144
145
146/**
147 * Periodically announce self id in the DHT
148 *
149 * @param cls closure
150 */
151static void
152announce_id (void *cls)
153{
154 struct GNUNET_HashCode phash;
155 const struct GNUNET_HELLO_Message *hello;
156 size_t size;
157 struct GNUNET_TIME_Absolute expiration;
158 struct GNUNET_TIME_Relative next_put;
159
160 hello = GCH_get_mine ();
161 size = (NULL != hello) ? GNUNET_HELLO_size (hello) : 0;
162 if (0 == size)
163 {
164 expiration = GNUNET_TIME_absolute_add (GNUNET_TIME_absolute_get (),
165 announce_delay);
166 announce_delay = GNUNET_TIME_STD_BACKOFF (announce_delay);
167 }
168 else
169 {
170 expiration = GNUNET_HELLO_get_last_expiration (hello);
171 announce_delay = GNUNET_TIME_UNIT_SECONDS;
172 }
173
174 /* Call again in id_announce_time, unless HELLO expires first,
175 * but wait at least 1s. */
176 next_put
177 = GNUNET_TIME_absolute_get_remaining (expiration);
178 next_put
179 = GNUNET_TIME_relative_min (next_put,
180 id_announce_time);
181 next_put
182 = GNUNET_TIME_relative_max (next_put,
183 GNUNET_TIME_UNIT_SECONDS);
184 announce_id_task
185 = GNUNET_SCHEDULER_add_delayed (next_put,
186 &announce_id,
187 cls);
188 GNUNET_STATISTICS_update (stats,
189 "# DHT announce",
190 1,
191 GNUNET_NO);
192 memset (&phash,
193 0,
194 sizeof(phash));
195 GNUNET_memcpy (&phash,
196 &my_full_id,
197 sizeof(my_full_id));
198 LOG (GNUNET_ERROR_TYPE_DEBUG,
199 "Announcing my HELLO (%lu bytes) in the DHT\n",
200 (unsigned long) size);
201 GNUNET_DHT_put (dht_handle, /* DHT handle */
202 &phash, /* Key to use */
203 dht_replication_level, /* Replication level */
204 GNUNET_DHT_RO_RECORD_ROUTE
205 | GNUNET_DHT_RO_DEMULTIPLEX_EVERYWHERE, /* DHT options */
206 GNUNET_BLOCK_TYPE_LEGACY_HELLO, /* Block type */
207 size, /* Size of the data */
208 (const char *) hello, /* Data itself */
209 expiration, /* Data expiration */
210 NULL, /* Continuation */
211 NULL); /* Continuation closure */
212}
213
214
215void
216GCD_hello_update ()
217{
218 if (NULL == announce_id_task)
219 return; /* too early */
220 GNUNET_SCHEDULER_cancel (announce_id_task);
221 announce_id_task
222 = GNUNET_SCHEDULER_add_delayed (CHANGE_DELAY,
223 &announce_id,
224 NULL);
225}
226
227
228void
229GCD_init (const struct GNUNET_CONFIGURATION_Handle *c)
230{
231 if (GNUNET_OK !=
232 GNUNET_CONFIGURATION_get_value_number (c,
233 "CADET",
234 "DHT_REPLICATION_LEVEL",
235 &dht_replication_level))
236 {
237 GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_WARNING,
238 "CADET",
239 "DHT_REPLICATION_LEVEL",
240 "USING DEFAULT");
241 dht_replication_level = 3;
242 }
243
244 if (GNUNET_OK !=
245 GNUNET_CONFIGURATION_get_value_time (c,
246 "CADET",
247 "ID_ANNOUNCE_TIME",
248 &id_announce_time))
249 {
250 GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_ERROR,
251 "CADET",
252 "ID_ANNOUNCE_TIME",
253 "MISSING");
254 GNUNET_SCHEDULER_shutdown ();
255 return;
256 }
257
258 dht_handle = GNUNET_DHT_connect (c,
259 64);
260 GNUNET_break (NULL != dht_handle);
261 announce_delay = GNUNET_TIME_UNIT_SECONDS;
262 announce_id_task = GNUNET_SCHEDULER_add_delayed (STARTUP_DELAY,
263 &announce_id,
264 NULL);
265}
266
267
268void
269GCD_shutdown (void)
270{
271 if (NULL != dht_handle)
272 {
273 GNUNET_DHT_disconnect (dht_handle);
274 dht_handle = NULL;
275 }
276 if (NULL != announce_id_task)
277 {
278 GNUNET_SCHEDULER_cancel (announce_id_task);
279 announce_id_task = NULL;
280 }
281}
282
283
284struct GCD_search_handle *
285GCD_search (const struct GNUNET_PeerIdentity *peer_id)
286{
287 struct GNUNET_HashCode phash;
288 struct GCD_search_handle *h;
289
290 GNUNET_STATISTICS_update (stats,
291 "# DHT search",
292 1,
293 GNUNET_NO);
294 memset (&phash,
295 0,
296 sizeof(phash));
297 GNUNET_memcpy (&phash,
298 peer_id,
299 sizeof(*peer_id));
300
301 h = GNUNET_new (struct GCD_search_handle);
302 h->dhtget = GNUNET_DHT_get_start (dht_handle, /* handle */
303 GNUNET_BLOCK_TYPE_LEGACY_HELLO, /* type */
304 &phash, /* key to search */
305 dht_replication_level, /* replication level */
306 GNUNET_DHT_RO_RECORD_ROUTE
307 | GNUNET_DHT_RO_DEMULTIPLEX_EVERYWHERE,
308 NULL, /* xquery */
309 0, /* xquery bits */
310 &dht_get_id_handler,
311 h);
312 LOG (GNUNET_ERROR_TYPE_DEBUG,
313 "Starting DHT GET for peer %s (%p)\n",
314 GNUNET_i2s (peer_id),
315 h);
316 return h;
317}
318
319
320void
321GCD_search_stop (struct GCD_search_handle *h)
322{
323 LOG (GNUNET_ERROR_TYPE_DEBUG,
324 "Stopping DHT GET %p\n",
325 h);
326 GNUNET_DHT_get_stop (h->dhtget);
327 GNUNET_free (h);
328}
329
330
331/* end of gnunet-service-cadet_dht.c */
generated by cgit v1.2.3 (git 2.39.1) at 2024-05-25 22:38:05 +0000