2 This file is part of GNUnet
3 (C) 2010 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 block/plugin_block_dns.c
23 * @brief block plugin for storing .gnunet-bindings
24 * @author Philipp Tölke
28 #include "gnunet_block_plugin.h"
29 #include "block_dns.h"
30 #include "gnunet_signatures.h"
32 #define DEBUG_DHT GNUNET_NO
35 * Function called to validate a reply or a request. For
36 * request evaluation, simply pass "NULL" for the reply_block.
39 * @param type block type
40 * @param query original query (hash)
41 * @param bf pointer to bloom filter associated with query; possibly updated (!)
42 * @param bf_mutator mutation value for bf
43 * @param xquery extended query data (can be NULL, depending on type)
44 * @param xquery_size number of bytes in xquery
45 * @param reply_block response to validate
46 * @param reply_block_size number of bytes in reply block
47 * @return characterization of result
49 static enum GNUNET_BLOCK_EvaluationResult
50 block_plugin_dns_evaluate (void *cls,
51 enum GNUNET_BLOCK_Type type,
52 const GNUNET_HashCode * query,
53 struct GNUNET_CONTAINER_BloomFilter **bf,
57 const void *reply_block, size_t reply_block_size)
61 case GNUNET_BLOCK_TYPE_DNS:
63 return GNUNET_BLOCK_EVALUATION_REQUEST_INVALID;
65 if (reply_block_size == 0)
66 return GNUNET_BLOCK_EVALUATION_REQUEST_VALID;
68 if (reply_block_size != sizeof (struct GNUNET_DNS_Record))
70 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
71 "DNS-Block is invalid: reply_block_size=%d != %d\n",
72 reply_block_size, sizeof (struct GNUNET_DNS_Record));
73 return GNUNET_BLOCK_EVALUATION_RESULT_INVALID;
76 const struct GNUNET_DNS_Record *rec = reply_block;
78 if (ntohl (rec->purpose.size) !=
79 sizeof (struct GNUNET_DNS_Record) -
80 sizeof (struct GNUNET_CRYPTO_RsaSignature))
82 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
83 "DNS-Block is invalid: rec->purpose.size=%d != %d\n",
84 ntohl (rec->purpose.size),
85 sizeof (struct GNUNET_DNS_Record) -
86 sizeof (struct GNUNET_CRYPTO_RsaSignature));
87 return GNUNET_BLOCK_EVALUATION_RESULT_INVALID;
90 if (GNUNET_TIME_relative_get_zero ().rel_value ==
91 GNUNET_TIME_absolute_get_remaining (rec->expiration_time).rel_value)
93 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "DNS-Block is invalid: Timeout\n");
94 return GNUNET_BLOCK_EVALUATION_RESULT_INVALID;
98 GNUNET_CRYPTO_rsa_verify (htonl (GNUNET_SIGNATURE_PURPOSE_DNS_RECORD),
99 &rec->purpose, &rec->signature, &rec->peer))
101 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
102 "DNS-Block is invalid: invalid signature\n");
103 return GNUNET_BLOCK_EVALUATION_RESULT_INVALID;
106 /* How to decide whether there are no more? */
107 return GNUNET_BLOCK_EVALUATION_OK_MORE;
109 return GNUNET_BLOCK_EVALUATION_TYPE_NOT_SUPPORTED;
115 * Function called to obtain the key for a block.
118 * @param type block type
119 * @param block block to get the key for
120 * @param block_size number of bytes in block
121 * @param key set to the key (query) for the given block
122 * @return GNUNET_OK on success, GNUNET_SYSERR if type not supported
123 * (or if extracting a key from a block of this type does not work)
126 block_plugin_dns_get_key (void *cls,
127 enum GNUNET_BLOCK_Type type,
129 size_t block_size, GNUNET_HashCode * key)
131 if (type != GNUNET_BLOCK_TYPE_DNS)
132 return GNUNET_SYSERR;
133 const struct GNUNET_DNS_Record *rec = block;
135 memcpy (key, &rec->service_descriptor, sizeof (GNUNET_HashCode));
140 * Entry point for the plugin.
143 libgnunet_plugin_block_dns_init (void *cls)
145 static enum GNUNET_BLOCK_Type types[] =
147 GNUNET_BLOCK_TYPE_DNS,
148 GNUNET_BLOCK_TYPE_ANY /* end of list */
150 struct GNUNET_BLOCK_PluginFunctions *api;
152 api = GNUNET_malloc (sizeof (struct GNUNET_BLOCK_PluginFunctions));
153 api->evaluate = &block_plugin_dns_evaluate;
154 api->get_key = &block_plugin_dns_get_key;
161 * Exit point from the plugin.
164 libgnunet_plugin_block_dns_done (void *cls)
166 struct GNUNET_TRANSPORT_PluginFunctions *api = cls;
172 /* end of plugin_block_dns.c */