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Diffstat (limited to 'src/dns/plugin_block_dns.c')
-rw-r--r--src/dns/plugin_block_dns.c291
1 files changed, 0 insertions, 291 deletions
diff --git a/src/dns/plugin_block_dns.c b/src/dns/plugin_block_dns.c
deleted file mode 100644
index 0531a8a5f..000000000
--- a/src/dns/plugin_block_dns.c
+++ /dev/null
@@ -1,291 +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 raw_data optional serialized prior state of the group, NULL if unavailable/fresh
50 * @param raw_data_size number of bytes in @a raw_data, 0 if unavailable/fresh
51 * @param va variable arguments specific to @a type
52 * @return block group handle, NULL if block groups are not supported
53 * by this @a type of block (this is not an error)
54 */
55static struct GNUNET_BLOCK_Group *
56block_plugin_dns_create_group (void *cls,
57 enum GNUNET_BLOCK_Type type,
58 const void *raw_data,
59 size_t raw_data_size,
60 va_list va)
61{
62 unsigned int bf_size;
63 const char *guard;
64
65 guard = va_arg (va, const char *);
66 if (0 == strcmp (guard,
67 "seen-set-size"))
68 bf_size = GNUNET_BLOCK_GROUP_compute_bloomfilter_size (va_arg (va, unsigned
69 int),
70 BLOOMFILTER_K);
71 else if (0 == strcmp (guard,
72 "filter-size"))
73 bf_size = va_arg (va, unsigned int);
74 else
75 {
76 GNUNET_break (0);
77 bf_size = 8;
78 }
79 GNUNET_break (NULL == va_arg (va, const char *));
80 return GNUNET_BLOCK_GROUP_bf_create (cls,
81 bf_size,
82 BLOOMFILTER_K,
83 type,
84 raw_data,
85 raw_data_size);
86}
87
88
89/**
90 * Function called to validate a query.
91 *
92 * @param cls closure
93 * @param ctx block context
94 * @param type block type
95 * @param query original query (hash)
96 * @param xquery extrended query data (can be NULL, depending on type)
97 * @param xquery_size number of bytes in @a xquery
98 * @return #GNUNET_OK if the query is fine, #GNUNET_NO if not
99 */
100static enum GNUNET_GenericReturnValue
101block_plugin_dns_check_query (void *cls,
102 enum GNUNET_BLOCK_Type type,
103 const struct GNUNET_HashCode *query,
104 const void *xquery,
105 size_t xquery_size)
106{
107 switch (type)
108 {
109 case GNUNET_BLOCK_TYPE_DNS:
110 if (0 != xquery_size)
111 {
112 GNUNET_break_op (0);
113 return GNUNET_NO;
114 }
115 return GNUNET_OK;
116 default:
117 GNUNET_break (0);
118 return GNUNET_SYSERR;
119 }
120}
121
122
123/**
124 * Function called to validate a block for storage.
125 *
126 * @param cls closure
127 * @param type block type
128 * @param block block data to validate
129 * @param block_size number of bytes in @a block
130 * @return #GNUNET_OK if the block is fine, #GNUNET_NO if not
131 */
132static enum GNUNET_GenericReturnValue
133block_plugin_dns_check_block (void *cls,
134 enum GNUNET_BLOCK_Type type,
135 const void *block,
136 size_t block_size)
137{
138 const struct GNUNET_DNS_Advertisement *ad;
139
140 switch (type)
141 {
142 case GNUNET_BLOCK_TYPE_DNS:
143 if (sizeof(struct GNUNET_DNS_Advertisement) != block_size)
144 {
145 GNUNET_break_op (0);
146 return GNUNET_NO;
147 }
148 ad = block;
149
150 if (ntohl (ad->purpose.size) !=
151 sizeof(struct GNUNET_DNS_Advertisement)
152 - sizeof(struct GNUNET_CRYPTO_EddsaSignature))
153 {
154 GNUNET_break_op (0);
155 return GNUNET_NO;
156 }
157 if (GNUNET_TIME_absolute_is_past (
158 GNUNET_TIME_absolute_ntoh (ad->expiration_time)))
159 {
160 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
161 "DNS advertisement has expired\n");
162 return GNUNET_NO;
163 }
164 if (GNUNET_OK !=
165 GNUNET_CRYPTO_eddsa_verify_ (GNUNET_SIGNATURE_PURPOSE_DNS_RECORD,
166 &ad->purpose,
167 &ad->signature,
168 &ad->peer.public_key))
169 {
170 GNUNET_break_op (0);
171 return GNUNET_NO;
172 }
173 return GNUNET_OK;
174 default:
175 GNUNET_break (0);
176 return GNUNET_SYSERR;
177 }
178}
179
180
181/**
182 * Function called to validate a reply to a request. Note that it is assumed
183 * that the reply has already been matched to the key (and signatures checked)
184 * as it would be done with the GetKeyFunction and the
185 * BlockEvaluationFunction.
186 *
187 * @param cls closure
188 * @param type block type
189 * @param group which block group to use for evaluation
190 * @param query original query (hash)
191 * @param xquery extrended query data (can be NULL, depending on type)
192 * @param xquery_size number of bytes in @a xquery
193 * @param reply_block response to validate
194 * @param reply_block_size number of bytes in @a reply_block
195 * @return characterization of result
196 */
197static enum GNUNET_BLOCK_ReplyEvaluationResult
198block_plugin_dns_check_reply (
199 void *cls,
200 enum GNUNET_BLOCK_Type type,
201 struct GNUNET_BLOCK_Group *group,
202 const struct GNUNET_HashCode *query,
203 const void *xquery,
204 size_t xquery_size,
205 const void *reply_block,
206 size_t reply_block_size)
207{
208 struct GNUNET_HashCode phash;
209
210 switch (type)
211 {
212 case GNUNET_BLOCK_TYPE_DNS:
213 GNUNET_CRYPTO_hash (reply_block,
214 reply_block_size,
215 &phash);
216 if (GNUNET_YES ==
217 GNUNET_BLOCK_GROUP_bf_test_and_set (group,
218 &phash))
219 return GNUNET_BLOCK_REPLY_OK_DUPLICATE;
220 return GNUNET_BLOCK_REPLY_OK_MORE;
221 default:
222 GNUNET_break (0);
223 return GNUNET_BLOCK_REPLY_TYPE_NOT_SUPPORTED;
224 }
225}
226
227
228/**
229 * Function called to obtain the key for a block.
230 *
231 * @param cls closure
232 * @param type block type
233 * @param block block to get the key for
234 * @param block_size number of bytes in @a block
235 * @param key set to the key (query) for the given block
236 * @return #GNUNET_OK on success, #GNUNET_SYSERR if type not supported
237 * (or if extracting a key from a block of this type does not work)
238 */
239static enum GNUNET_GenericReturnValue
240block_plugin_dns_get_key (void *cls,
241 enum GNUNET_BLOCK_Type type,
242 const void *block,
243 size_t block_size,
244 struct GNUNET_HashCode *key)
245{
246 if (GNUNET_BLOCK_TYPE_DNS != type)
247 {
248 GNUNET_break (0);
249 return GNUNET_SYSERR;
250 }
251 return GNUNET_NO;
252}
253
254
255/**
256 * Entry point for the plugin.
257 */
258void *
259libgnunet_plugin_block_dns_init (void *cls)
260{
261 static enum GNUNET_BLOCK_Type types[] = {
262 GNUNET_BLOCK_TYPE_DNS,
263 GNUNET_BLOCK_TYPE_ANY /* end of list */
264 };
265 struct GNUNET_BLOCK_PluginFunctions *api;
266
267 api = GNUNET_new (struct GNUNET_BLOCK_PluginFunctions);
268 api->get_key = &block_plugin_dns_get_key;
269 api->check_query = &block_plugin_dns_check_query;
270 api->check_block = &block_plugin_dns_check_block;
271 api->check_reply = &block_plugin_dns_check_reply;
272 api->create_group = &block_plugin_dns_create_group;
273 api->types = types;
274 return api;
275}
276
277
278/**
279 * Exit point from the plugin.
280 */
281void *
282libgnunet_plugin_block_dns_done (void *cls)
283{
284 struct GNUNET_BLOCK_PluginFunctions *api = cls;
285
286 GNUNET_free (api);
287 return NULL;
288}
289
290
291/* end of plugin_block_dns.c */
generated by cgit v1.2.3 (git 2.39.1) at 2024-05-11 03:07:25 +0000