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,
58 size_t reply_block_size)
62 case GNUNET_BLOCK_TYPE_DNS:
64 return GNUNET_BLOCK_EVALUATION_REQUEST_INVALID;
66 if (reply_block_size == 0)
67 return GNUNET_BLOCK_EVALUATION_REQUEST_VALID;
69 if (reply_block_size != sizeof(struct GNUNET_DNS_Record))
70 return GNUNET_BLOCK_EVALUATION_RESULT_INVALID;
72 const struct GNUNET_DNS_Record* rec = reply_block;
74 if (ntohl(rec->purpose.size) != sizeof(struct GNUNET_DNS_Record) - sizeof(struct GNUNET_CRYPTO_RsaSignature))
75 return GNUNET_BLOCK_EVALUATION_RESULT_INVALID;
77 if (GNUNET_TIME_relative_get_zero().rel_value == GNUNET_TIME_absolute_get_remaining(rec->expiration_time).rel_value)
78 return GNUNET_BLOCK_EVALUATION_RESULT_INVALID;
80 if (GNUNET_OK != GNUNET_CRYPTO_rsa_verify (htonl(GNUNET_SIGNATURE_PURPOSE_DNS_RECORD),
84 return GNUNET_BLOCK_EVALUATION_RESULT_INVALID;
86 /* How to decide whether there are no more? */
87 return GNUNET_BLOCK_EVALUATION_OK_MORE;
89 return GNUNET_BLOCK_EVALUATION_TYPE_NOT_SUPPORTED;
95 * Function called to obtain the key for a block.
98 * @param type block type
99 * @param block block to get the key for
100 * @param block_size number of bytes in block
101 * @param key set to the key (query) for the given block
102 * @return GNUNET_OK on success, GNUNET_SYSERR if type not supported
103 * (or if extracting a key from a block of this type does not work)
106 block_plugin_dns_get_key (void *cls,
107 enum GNUNET_BLOCK_Type type,
110 GNUNET_HashCode *key)
112 if (type != GNUNET_BLOCK_TYPE_DNS)
113 return GNUNET_SYSERR;
114 const struct GNUNET_DNS_Record* rec = block;
115 memcpy(key, &rec->service_descriptor, sizeof(GNUNET_HashCode));
120 * Entry point for the plugin.
123 libgnunet_plugin_block_dns_init (void *cls)
125 static enum GNUNET_BLOCK_Type types[] =
127 GNUNET_BLOCK_TYPE_DNS,
128 GNUNET_BLOCK_TYPE_ANY /* end of list */
130 struct GNUNET_BLOCK_PluginFunctions *api;
132 api = GNUNET_malloc (sizeof (struct GNUNET_BLOCK_PluginFunctions));
133 api->evaluate = &block_plugin_dns_evaluate;
134 api->get_key = &block_plugin_dns_get_key;
141 * Exit point from the plugin.
144 libgnunet_plugin_block_dns_done (void *cls)
146 struct GNUNET_TRANSPORT_PluginFunctions *api = cls;
152 /* end of plugin_block_dns.c */