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-rw-r--r--src/dns/plugin_block_dns.c294
1 files changed, 0 insertions, 294 deletions
diff --git a/src/dns/plugin_block_dns.c b/src/dns/plugin_block_dns.c
deleted file mode 100644
index a596beb28..000000000
--- a/src/dns/plugin_block_dns.c
+++ /dev/null
@@ -1,294 +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/**
22 * @file dns/plugin_block_dns.c
23 * @brief block plugin for advertising a DNS exit service
24 * @author Christian Grothoff
25 *
26 * Note that this plugin might more belong with EXIT and PT
27 * as those two are using this type of block. Still, this
28 * might be a natural enough place for people to find the code...
29 */
30#include "platform.h"
31#include "gnunet_block_plugin.h"
32#include "block_dns.h"
33#include "gnunet_signatures.h"
34#include "gnunet_block_group_lib.h"
35
36
37/**
38 * Number of bits we set per entry in the bloomfilter.
39 * Do not change!
40 */
41#define BLOOMFILTER_K 16
42
43
44/**
45 * Create a new block group.
46 *
47 * @param ctx block context in which the block group is created
48 * @param type type of the block for which we are creating the group
49 * @param nonce random value used to seed the group creation
50 * @param raw_data optional serialized prior state of the group, NULL if unavailable/fresh
51 * @param raw_data_size number of bytes in @a raw_data, 0 if unavailable/fresh
52 * @param va variable arguments specific to @a type
53 * @return block group handle, NULL if block groups are not supported
54 * by this @a type of block (this is not an error)
55 */
56static struct GNUNET_BLOCK_Group *
57block_plugin_dns_create_group (void *cls,
58 enum GNUNET_BLOCK_Type type,
59 uint32_t nonce,
60 const void *raw_data,
61 size_t raw_data_size,
62 va_list va)
63{
64 unsigned int bf_size;
65 const char *guard;
66
67 guard = va_arg (va, const char *);
68 if (0 == strcmp (guard,
69 "seen-set-size"))
70 bf_size = GNUNET_BLOCK_GROUP_compute_bloomfilter_size (va_arg (va, unsigned
71 int),
72 BLOOMFILTER_K);
73 else if (0 == strcmp (guard,
74 "filter-size"))
75 bf_size = va_arg (va, unsigned int);
76 else
77 {
78 GNUNET_break (0);
79 bf_size = 8;
80 }
81 GNUNET_break (NULL == va_arg (va, const char *));
82 return GNUNET_BLOCK_GROUP_bf_create (cls,
83 bf_size,
84 BLOOMFILTER_K,
85 type,
86 nonce,
87 raw_data,
88 raw_data_size);
89}
90
91
92/**
93 * Function called to validate a query.
94 *
95 * @param cls closure
96 * @param ctx block context
97 * @param type block type
98 * @param query original query (hash)
99 * @param xquery extrended query data (can be NULL, depending on type)
100 * @param xquery_size number of bytes in @a xquery
101 * @return #GNUNET_OK if the query is fine, #GNUNET_NO if not
102 */
103static enum GNUNET_GenericReturnValue
104block_plugin_dns_check_query (void *cls,
105 enum GNUNET_BLOCK_Type type,
106 const struct GNUNET_HashCode *query,
107 const void *xquery,
108 size_t xquery_size)
109{
110 switch (type)
111 {
112 case GNUNET_BLOCK_TYPE_DNS:
113 if (0 != xquery_size)
114 {
115 GNUNET_break_op (0);
116 return GNUNET_NO;
117 }
118 return GNUNET_OK;
119 default:
120 GNUNET_break (0);
121 return GNUNET_SYSERR;
122 }
123}
124
125
126/**
127 * Function called to validate a block for storage.
128 *
129 * @param cls closure
130 * @param type block type
131 * @param block block data to validate
132 * @param block_size number of bytes in @a block
133 * @return #GNUNET_OK if the block is fine, #GNUNET_NO if not
134 */
135static enum GNUNET_GenericReturnValue
136block_plugin_dns_check_block (void *cls,
137 enum GNUNET_BLOCK_Type type,
138 const void *block,
139 size_t block_size)
140{
141 const struct GNUNET_DNS_Advertisement *ad;
142
143 switch (type)
144 {
145 case GNUNET_BLOCK_TYPE_DNS:
146 if (sizeof(struct GNUNET_DNS_Advertisement) != block_size)
147 {
148 GNUNET_break_op (0);
149 return GNUNET_NO;
150 }
151 ad = block;
152
153 if (ntohl (ad->purpose.size) !=
154 sizeof(struct GNUNET_DNS_Advertisement)
155 - sizeof(struct GNUNET_CRYPTO_EddsaSignature))
156 {
157 GNUNET_break_op (0);
158 return GNUNET_NO;
159 }
160 if (GNUNET_TIME_absolute_is_past (
161 GNUNET_TIME_absolute_ntoh (ad->expiration_time)))
162 {
163 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
164 "DNS advertisement has expired\n");
165 return GNUNET_NO;
166 }
167 if (GNUNET_OK !=
168 GNUNET_CRYPTO_eddsa_verify_ (GNUNET_SIGNATURE_PURPOSE_DNS_RECORD,
169 &ad->purpose,
170 &ad->signature,
171 &ad->peer.public_key))
172 {
173 GNUNET_break_op (0);
174 return GNUNET_NO;
175 }
176 return GNUNET_OK;
177 default:
178 GNUNET_break (0);
179 return GNUNET_SYSERR;
180 }
181}
182
183
184/**
185 * Function called to validate a reply to a request. Note that it is assumed
186 * that the reply has already been matched to the key (and signatures checked)
187 * as it would be done with the GetKeyFunction and the
188 * BlockEvaluationFunction.
189 *
190 * @param cls closure
191 * @param type block type
192 * @param group which block group to use for evaluation
193 * @param query original query (hash)
194 * @param xquery extrended query data (can be NULL, depending on type)
195 * @param xquery_size number of bytes in @a xquery
196 * @param reply_block response to validate
197 * @param reply_block_size number of bytes in @a reply_block
198 * @return characterization of result
199 */
200static enum GNUNET_BLOCK_ReplyEvaluationResult
201block_plugin_dns_check_reply (
202 void *cls,
203 enum GNUNET_BLOCK_Type type,
204 struct GNUNET_BLOCK_Group *group,
205 const struct GNUNET_HashCode *query,
206 const void *xquery,
207 size_t xquery_size,
208 const void *reply_block,
209 size_t reply_block_size)
210{
211 struct GNUNET_HashCode phash;
212
213 switch (type)
214 {
215 case GNUNET_BLOCK_TYPE_DNS:
216 GNUNET_CRYPTO_hash (reply_block,
217 reply_block_size,
218 &phash);
219 if (GNUNET_YES ==
220 GNUNET_BLOCK_GROUP_bf_test_and_set (group,
221 &phash))
222 return GNUNET_BLOCK_REPLY_OK_DUPLICATE;
223 return GNUNET_BLOCK_REPLY_OK_MORE;
224 default:
225 GNUNET_break (0);
226 return GNUNET_BLOCK_REPLY_TYPE_NOT_SUPPORTED;
227 }
228}
229
230
231/**
232 * Function called to obtain the key for a block.
233 *
234 * @param cls closure
235 * @param type block type
236 * @param block block to get the key for
237 * @param block_size number of bytes in @a block
238 * @param key set to the key (query) for the given block
239 * @return #GNUNET_OK on success, #GNUNET_SYSERR if type not supported
240 * (or if extracting a key from a block of this type does not work)
241 */
242static enum GNUNET_GenericReturnValue
243block_plugin_dns_get_key (void *cls,
244 enum GNUNET_BLOCK_Type type,
245 const void *block,
246 size_t block_size,
247 struct GNUNET_HashCode *key)
248{
249 if (GNUNET_BLOCK_TYPE_DNS != type)
250 {
251 GNUNET_break (0);
252 return GNUNET_SYSERR;
253 }
254 return GNUNET_NO;
255}
256
257
258/**
259 * Entry point for the plugin.
260 */
261void *
262libgnunet_plugin_block_dns_init (void *cls)
263{
264 static enum GNUNET_BLOCK_Type types[] = {
265 GNUNET_BLOCK_TYPE_DNS,
266 GNUNET_BLOCK_TYPE_ANY /* end of list */
267 };
268 struct GNUNET_BLOCK_PluginFunctions *api;
269
270 api = GNUNET_new (struct GNUNET_BLOCK_PluginFunctions);
271 api->get_key = &block_plugin_dns_get_key;
272 api->check_query = &block_plugin_dns_check_query;
273 api->check_block = &block_plugin_dns_check_block;
274 api->check_reply = &block_plugin_dns_check_reply;
275 api->create_group = &block_plugin_dns_create_group;
276 api->types = types;
277 return api;
278}
279
280
281/**
282 * Exit point from the plugin.
283 */
284void *
285libgnunet_plugin_block_dns_done (void *cls)
286{
287 struct GNUNET_BLOCK_PluginFunctions *api = cls;
288
289 GNUNET_free (api);
290 return NULL;
291}
292
293
294/* end of plugin_block_dns.c */
generated by cgit v1.2.3 (git 2.39.1) at 2024-04-18 21:10:42 +0000