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author | Christian Grothoff <christian@grothoff.org> | 2012-01-02 04:40:19 +0000 |
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committer | Christian Grothoff <christian@grothoff.org> | 2012-01-02 04:40:19 +0000 |
commit | a0ba564746ecdff082ac3982d4d911f91deb8ab7 (patch) | |
tree | 140b348566ed4db87fee526f784bafa9249edf75 /src/dns/plugin_block_dns.c | |
parent | 86a020dbabef7e047706f462840bfe66b036093c (diff) | |
download | gnunet-a0ba564746ecdff082ac3982d4d911f91deb8ab7.tar.gz gnunet-a0ba564746ecdff082ac3982d4d911f91deb8ab7.zip |
-moving dns plugin to dns directory
Diffstat (limited to 'src/dns/plugin_block_dns.c')
-rw-r--r-- | src/dns/plugin_block_dns.c | 170 |
1 files changed, 170 insertions, 0 deletions
diff --git a/src/dns/plugin_block_dns.c b/src/dns/plugin_block_dns.c new file mode 100644 index 000000000..34b054c8d --- /dev/null +++ b/src/dns/plugin_block_dns.c | |||
@@ -0,0 +1,170 @@ | |||
1 | /* | ||
2 | This file is part of GNUnet | ||
3 | (C) 2010 Christian Grothoff (and other contributing authors) | ||
4 | |||
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. | ||
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 | General Public License for more details. | ||
14 | |||
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. | ||
19 | */ | ||
20 | |||
21 | /** | ||
22 | * @file vpn/plugin_block_dns.c | ||
23 | * @brief block plugin for storing .gnunet-bindings | ||
24 | * @author Philipp Tölke | ||
25 | */ | ||
26 | |||
27 | #include "platform.h" | ||
28 | #include "gnunet_block_plugin.h" | ||
29 | #include "block_dns.h" | ||
30 | #include "gnunet_signatures.h" | ||
31 | |||
32 | #define DEBUG_DHT GNUNET_EXTRA_LOGGING | ||
33 | |||
34 | /** | ||
35 | * Function called to validate a reply or a request. For | ||
36 | * request evaluation, simply pass "NULL" for the reply_block. | ||
37 | * | ||
38 | * @param cls closure | ||
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 | ||
48 | */ | ||
49 | static enum GNUNET_BLOCK_EvaluationResult | ||
50 | block_plugin_dns_evaluate (void *cls, enum GNUNET_BLOCK_Type type, | ||
51 | const 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) | ||
56 | { | ||
57 | switch (type) | ||
58 | { | ||
59 | case GNUNET_BLOCK_TYPE_DNS: | ||
60 | if (xquery_size != 0) | ||
61 | return GNUNET_BLOCK_EVALUATION_REQUEST_INVALID; | ||
62 | |||
63 | if (reply_block_size == 0) | ||
64 | return GNUNET_BLOCK_EVALUATION_REQUEST_VALID; | ||
65 | |||
66 | if (reply_block_size != sizeof (struct GNUNET_DNS_Record)) | ||
67 | { | ||
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; | ||
72 | } | ||
73 | |||
74 | const struct GNUNET_DNS_Record *rec = reply_block; | ||
75 | |||
76 | if (ntohl (rec->purpose.size) != | ||
77 | sizeof (struct GNUNET_DNS_Record) - | ||
78 | sizeof (struct GNUNET_CRYPTO_RsaSignature)) | ||
79 | { | ||
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_RsaSignature)); | ||
85 | return GNUNET_BLOCK_EVALUATION_RESULT_INVALID; | ||
86 | } | ||
87 | |||
88 | if (GNUNET_TIME_relative_get_zero ().rel_value == | ||
89 | GNUNET_TIME_absolute_get_remaining (GNUNET_TIME_absolute_ntoh | ||
90 | (rec->expiration_time)).rel_value) | ||
91 | { | ||
92 | GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "DNS-Block is invalid: Timeout\n"); | ||
93 | return GNUNET_BLOCK_EVALUATION_RESULT_INVALID; | ||
94 | } | ||
95 | |||
96 | if (GNUNET_OK != | ||
97 | GNUNET_CRYPTO_rsa_verify (htonl (GNUNET_SIGNATURE_PURPOSE_DNS_RECORD), | ||
98 | &rec->purpose, &rec->signature, &rec->peer)) | ||
99 | { | ||
100 | GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, | ||
101 | "DNS-Block is invalid: invalid signature\n"); | ||
102 | return GNUNET_BLOCK_EVALUATION_RESULT_INVALID; | ||
103 | } | ||
104 | |||
105 | /* How to decide whether there are no more? */ | ||
106 | return GNUNET_BLOCK_EVALUATION_OK_MORE; | ||
107 | default: | ||
108 | return GNUNET_BLOCK_EVALUATION_TYPE_NOT_SUPPORTED; | ||
109 | } | ||
110 | } | ||
111 | |||
112 | |||
113 | /** | ||
114 | * Function called to obtain the key for a block. | ||
115 | * | ||
116 | * @param cls closure | ||
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) | ||
123 | */ | ||
124 | static int | ||
125 | block_plugin_dns_get_key (void *cls, enum GNUNET_BLOCK_Type type, | ||
126 | const void *block, size_t block_size, | ||
127 | GNUNET_HashCode * key) | ||
128 | { | ||
129 | if (type != GNUNET_BLOCK_TYPE_DNS) | ||
130 | return GNUNET_SYSERR; | ||
131 | const struct GNUNET_DNS_Record *rec = block; | ||
132 | |||
133 | memcpy (key, &rec->service_descriptor, sizeof (GNUNET_HashCode)); | ||
134 | return GNUNET_OK; | ||
135 | } | ||
136 | |||
137 | /** | ||
138 | * Entry point for the plugin. | ||
139 | */ | ||
140 | void * | ||
141 | libgnunet_plugin_block_dns_init (void *cls) | ||
142 | { | ||
143 | static enum GNUNET_BLOCK_Type types[] = | ||
144 | { | ||
145 | GNUNET_BLOCK_TYPE_DNS, | ||
146 | GNUNET_BLOCK_TYPE_ANY /* end of list */ | ||
147 | }; | ||
148 | struct GNUNET_BLOCK_PluginFunctions *api; | ||
149 | |||
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; | ||
153 | api->types = types; | ||
154 | return api; | ||
155 | } | ||
156 | |||
157 | |||
158 | /** | ||
159 | * Exit point from the plugin. | ||
160 | */ | ||
161 | void * | ||
162 | libgnunet_plugin_block_dns_done (void *cls) | ||
163 | { | ||
164 | struct GNUNET_TRANSPORT_PluginFunctions *api = cls; | ||
165 | |||
166 | GNUNET_free (api); | ||
167 | return NULL; | ||
168 | } | ||
169 | |||
170 | /* end of plugin_block_dns.c */ | ||