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Diffstat (limited to 'src/dns/plugin_block_dns.c')
-rw-r--r--src/dns/plugin_block_dns.c236
1 files changed, 0 insertions, 236 deletions
diff --git a/src/dns/plugin_block_dns.c b/src/dns/plugin_block_dns.c
deleted file mode 100644
index e0beccb52..000000000
--- a/src/dns/plugin_block_dns.c
+++ /dev/null
@@ -1,236 +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 reply or a request. For
94 * request evaluation, simply pass "NULL" for the reply_block.
95 *
96 * @param cls closure
97 * @param ctx block context
98 * @param type block type
99 * @param bg group to evaluate against
100 * @param eo control flags
101 * @param query original query (hash)
102 * @param xquery extended query data (can be NULL, depending on type)
103 * @param xquery_size number of bytes in @a xquery
104 * @param reply_block response to validate
105 * @param reply_block_size number of bytes in @a reply_block
106 * @return characterization of result
107 */
108static enum GNUNET_BLOCK_EvaluationResult
109block_plugin_dns_evaluate (void *cls,
110 struct GNUNET_BLOCK_Context *ctx,
111 enum GNUNET_BLOCK_Type type,
112 struct GNUNET_BLOCK_Group *bg,
113 enum GNUNET_BLOCK_EvaluationOptions eo,
114 const struct GNUNET_HashCode *query,
115 const void *xquery,
116 size_t xquery_size,
117 const void *reply_block,
118 size_t reply_block_size)
119{
120 const struct GNUNET_DNS_Advertisement *ad;
121 struct GNUNET_HashCode phash;
122
123 switch (type)
124 {
125 case GNUNET_BLOCK_TYPE_DNS:
126 if (0 != xquery_size)
127 return GNUNET_BLOCK_EVALUATION_REQUEST_INVALID;
128
129 if (NULL == reply_block)
130 return GNUNET_BLOCK_EVALUATION_REQUEST_VALID;
131
132 if (sizeof(struct GNUNET_DNS_Advertisement) != reply_block_size)
133 {
134 GNUNET_break_op (0);
135 return GNUNET_BLOCK_EVALUATION_RESULT_INVALID;
136 }
137 ad = reply_block;
138
139 if (ntohl (ad->purpose.size) !=
140 sizeof(struct GNUNET_DNS_Advertisement)
141 - sizeof(struct GNUNET_CRYPTO_EddsaSignature))
142 {
143 GNUNET_break_op (0);
144 return GNUNET_BLOCK_EVALUATION_RESULT_INVALID;
145 }
146 if (0 ==
147 GNUNET_TIME_absolute_get_remaining (GNUNET_TIME_absolute_ntoh
148 (ad->expiration_time)).
149 rel_value_us)
150 {
151 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
152 "DNS advertisement has expired\n");
153 return GNUNET_BLOCK_EVALUATION_RESULT_INVALID;
154 }
155 if (GNUNET_OK !=
156 GNUNET_CRYPTO_eddsa_verify_ (GNUNET_SIGNATURE_PURPOSE_DNS_RECORD,
157 &ad->purpose,
158 &ad->signature,
159 &ad->peer.public_key))
160 {
161 GNUNET_break_op (0);
162 return GNUNET_BLOCK_EVALUATION_RESULT_INVALID;
163 }
164 GNUNET_CRYPTO_hash (reply_block,
165 reply_block_size,
166 &phash);
167 if (GNUNET_YES ==
168 GNUNET_BLOCK_GROUP_bf_test_and_set (bg,
169 &phash))
170 return GNUNET_BLOCK_EVALUATION_OK_DUPLICATE;
171 return GNUNET_BLOCK_EVALUATION_OK_MORE;
172
173 default:
174 return GNUNET_BLOCK_EVALUATION_TYPE_NOT_SUPPORTED;
175 }
176}
177
178
179/**
180 * Function called to obtain the key for a block.
181 *
182 * @param cls closure
183 * @param type block type
184 * @param block block to get the key for
185 * @param block_size number of bytes in @a block
186 * @param key set to the key (query) for the given block
187 * @return #GNUNET_OK on success, #GNUNET_SYSERR if type not supported
188 * (or if extracting a key from a block of this type does not work)
189 */
190static int
191block_plugin_dns_get_key (void *cls,
192 enum GNUNET_BLOCK_Type type,
193 const void *block,
194 size_t block_size,
195 struct GNUNET_HashCode *key)
196{
197 /* we cannot extract a key from a block of this type */
198 return GNUNET_SYSERR;
199}
200
201
202/**
203 * Entry point for the plugin.
204 */
205void *
206libgnunet_plugin_block_dns_init (void *cls)
207{
208 static enum GNUNET_BLOCK_Type types[] = {
209 GNUNET_BLOCK_TYPE_DNS,
210 GNUNET_BLOCK_TYPE_ANY /* end of list */
211 };
212 struct GNUNET_BLOCK_PluginFunctions *api;
213
214 api = GNUNET_new (struct GNUNET_BLOCK_PluginFunctions);
215 api->evaluate = &block_plugin_dns_evaluate;
216 api->get_key = &block_plugin_dns_get_key;
217 api->create_group = &block_plugin_dns_create_group;
218 api->types = types;
219 return api;
220}
221
222
223/**
224 * Exit point from the plugin.
225 */
226void *
227libgnunet_plugin_block_dns_done (void *cls)
228{
229 struct GNUNET_BLOCK_PluginFunctions *api = cls;
230
231 GNUNET_free (api);
232 return NULL;
233}
234
235
236/* end of plugin_block_dns.c */
generated by cgit v1.2.3 (git 2.39.1) at 2024-04-18 16:14:20 +0000