2 This file is part of GNUnet
3 Copyright (C) 2013 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.
22 * @file dns/plugin_block_dns.c
23 * @brief block plugin for advertising a DNS exit service
24 * @author Christian Grothoff
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...
31 #include "gnunet_block_plugin.h"
32 #include "block_dns.h"
33 #include "gnunet_signatures.h"
37 * Function called to validate a reply or a request. For
38 * request evaluation, simply pass "NULL" for the reply_block.
41 * @param type block type
42 * @param query original query (hash)
43 * @param bf pointer to bloom filter associated with query; possibly updated (!)
44 * @param bf_mutator mutation value for bf
45 * @param xquery extended query data (can be NULL, depending on type)
46 * @param xquery_size number of bytes in @a xquery
47 * @param reply_block response to validate
48 * @param reply_block_size number of bytes in @a reply_block
49 * @return characterization of result
51 static enum GNUNET_BLOCK_EvaluationResult
52 block_plugin_dns_evaluate (void *cls, enum GNUNET_BLOCK_Type type,
53 const struct GNUNET_HashCode * query,
54 struct GNUNET_CONTAINER_BloomFilter **bf,
55 int32_t bf_mutator, const void *xquery,
56 size_t xquery_size, const void *reply_block,
57 size_t reply_block_size)
59 const struct GNUNET_DNS_Advertisement *ad;
63 case GNUNET_BLOCK_TYPE_DNS:
65 return GNUNET_BLOCK_EVALUATION_REQUEST_INVALID;
67 if (0 == reply_block_size)
68 return GNUNET_BLOCK_EVALUATION_REQUEST_VALID;
70 if (sizeof (struct GNUNET_DNS_Advertisement) != reply_block_size)
73 return GNUNET_BLOCK_EVALUATION_RESULT_INVALID;
77 if (ntohl (ad->purpose.size) !=
78 sizeof (struct GNUNET_DNS_Advertisement) -
79 sizeof (struct GNUNET_CRYPTO_EddsaSignature))
82 return GNUNET_BLOCK_EVALUATION_RESULT_INVALID;
85 GNUNET_TIME_absolute_get_remaining (GNUNET_TIME_absolute_ntoh
86 (ad->expiration_time)).rel_value_us)
88 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
89 "DNS advertisement has expired\n");
90 return GNUNET_BLOCK_EVALUATION_RESULT_INVALID;
93 GNUNET_CRYPTO_eddsa_verify (GNUNET_SIGNATURE_PURPOSE_DNS_RECORD,
96 &ad->peer.public_key))
99 return GNUNET_BLOCK_EVALUATION_RESULT_INVALID;
101 return GNUNET_BLOCK_EVALUATION_OK_MORE;
103 return GNUNET_BLOCK_EVALUATION_TYPE_NOT_SUPPORTED;
109 * Function called to obtain the key for a block.
112 * @param type block type
113 * @param block block to get the key for
114 * @param block_size number of bytes in @a block
115 * @param key set to the key (query) for the given block
116 * @return #GNUNET_OK on success, #GNUNET_SYSERR if type not supported
117 * (or if extracting a key from a block of this type does not work)
120 block_plugin_dns_get_key (void *cls,
121 enum GNUNET_BLOCK_Type type,
124 struct GNUNET_HashCode *key)
126 /* we cannot extract a key from a block of this type */
127 return GNUNET_SYSERR;
132 * Entry point for the plugin.
135 libgnunet_plugin_block_dns_init (void *cls)
137 static enum GNUNET_BLOCK_Type types[] =
139 GNUNET_BLOCK_TYPE_DNS,
140 GNUNET_BLOCK_TYPE_ANY /* end of list */
142 struct GNUNET_BLOCK_PluginFunctions *api;
144 api = GNUNET_new (struct GNUNET_BLOCK_PluginFunctions);
145 api->evaluate = &block_plugin_dns_evaluate;
146 api->get_key = &block_plugin_dns_get_key;
153 * Exit point from the plugin.
156 libgnunet_plugin_block_dns_done (void *cls)
158 struct GNUNET_BLOCK_PluginFunctions *api = cls;
164 /* end of plugin_block_dns.c */