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 dns/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_EXTRA_LOGGING
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, enum GNUNET_BLOCK_Type type,
51 const struct GNUNET_HashCode * query,
52 struct GNUNET_CONTAINER_BloomFilter **bf,
53 int32_t bf_mutator, const void *xquery,
54 size_t xquery_size, const void *reply_block,
55 size_t reply_block_size)
59 case GNUNET_BLOCK_TYPE_DNS:
61 return GNUNET_BLOCK_EVALUATION_REQUEST_INVALID;
63 if (reply_block_size == 0)
64 return GNUNET_BLOCK_EVALUATION_REQUEST_VALID;
66 if (reply_block_size != sizeof (struct GNUNET_DNS_Record))
68 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
69 "DNS-Block is invalid: reply_block_size=%d != %d\n",
70 reply_block_size, sizeof (struct GNUNET_DNS_Record));
71 return GNUNET_BLOCK_EVALUATION_RESULT_INVALID;
74 const struct GNUNET_DNS_Record *rec = reply_block;
76 if (ntohl (rec->purpose.size) !=
77 sizeof (struct GNUNET_DNS_Record) -
78 sizeof (struct GNUNET_CRYPTO_EccSignature))
80 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
81 "DNS-Block is invalid: rec->purpose.size=%d != %d\n",
82 ntohl (rec->purpose.size),
83 sizeof (struct GNUNET_DNS_Record) -
84 sizeof (struct GNUNET_CRYPTO_EccSignature));
85 return GNUNET_BLOCK_EVALUATION_RESULT_INVALID;
89 GNUNET_TIME_absolute_get_remaining (GNUNET_TIME_absolute_ntoh
90 (rec->expiration_time)).rel_value)
92 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "DNS-Block is invalid: Timeout\n");
93 return GNUNET_BLOCK_EVALUATION_RESULT_INVALID;
97 GNUNET_CRYPTO_ecc_verify (htonl (GNUNET_SIGNATURE_PURPOSE_DNS_RECORD),
98 &rec->purpose, &rec->signature, &rec->peer))
100 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
101 "DNS-Block is invalid: invalid signature\n");
102 return GNUNET_BLOCK_EVALUATION_RESULT_INVALID;
105 /* How to decide whether there are no more? */
106 return GNUNET_BLOCK_EVALUATION_OK_MORE;
108 return GNUNET_BLOCK_EVALUATION_TYPE_NOT_SUPPORTED;
114 * Function called to obtain the key for a block.
117 * @param type block type
118 * @param block block to get the key for
119 * @param block_size number of bytes in block
120 * @param key set to the key (query) for the given block
121 * @return GNUNET_OK on success, GNUNET_SYSERR if type not supported
122 * (or if extracting a key from a block of this type does not work)
125 block_plugin_dns_get_key (void *cls, enum GNUNET_BLOCK_Type type,
126 const void *block, size_t block_size,
127 struct GNUNET_HashCode * key)
129 if (type != GNUNET_BLOCK_TYPE_DNS)
130 return GNUNET_SYSERR;
131 const struct GNUNET_DNS_Record *rec = block;
133 memcpy (key, &rec->service_descriptor, sizeof (struct GNUNET_HashCode));
138 * Entry point for the plugin.
141 libgnunet_plugin_block_dns_init (void *cls)
143 static enum GNUNET_BLOCK_Type types[] =
145 GNUNET_BLOCK_TYPE_DNS,
146 GNUNET_BLOCK_TYPE_ANY /* end of list */
148 struct GNUNET_BLOCK_PluginFunctions *api;
150 api = GNUNET_malloc (sizeof (struct GNUNET_BLOCK_PluginFunctions));
151 api->evaluate = &block_plugin_dns_evaluate;
152 api->get_key = &block_plugin_dns_get_key;
159 * Exit point from the plugin.
162 libgnunet_plugin_block_dns_done (void *cls)
164 struct GNUNET_TRANSPORT_PluginFunctions *api = cls;
170 /* end of plugin_block_dns.c */