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_dht.c
23 * @brief block plugin for DHT internals (right now, find-peer requests only);
24 * other plugins should be used to store "useful" data in the
25 * DHT (see fs block plugin)
26 * @author Christian Grothoff
30 #include "gnunet_hello_lib.h"
31 #include "gnunet_block_plugin.h"
33 #define DEBUG_DHT GNUNET_NO
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 xquery
47 * @param reply_block response to validate
48 * @param reply_block_size number of bytes in reply block
49 * @return characterization of result
51 static enum GNUNET_BLOCK_EvaluationResult
52 block_plugin_dht_evaluate (void *cls, enum GNUNET_BLOCK_Type type,
53 const 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)
61 case GNUNET_BLOCK_TYPE_DHT_HELLO:
63 return GNUNET_BLOCK_EVALUATION_REQUEST_INVALID;
64 if (reply_block_size == 0)
65 return GNUNET_BLOCK_EVALUATION_REQUEST_VALID;
66 GNUNET_break (NULL == *bf);
67 return GNUNET_BLOCK_EVALUATION_OK_LAST;
69 return GNUNET_BLOCK_EVALUATION_TYPE_NOT_SUPPORTED;
75 * Function called to obtain the key for a block.
78 * @param type block type
79 * @param block block to get the key for
80 * @param block_size number of bytes in block
81 * @param key set to the key (query) for the given block
82 * @return GNUNET_OK on success, GNUNET_SYSERR if type not supported
83 * (or if extracting a key from a block of this type does not work)
86 block_plugin_dht_get_key (void *cls, enum GNUNET_BLOCK_Type type,
87 const void *block, size_t block_size,
88 GNUNET_HashCode * key)
90 const struct GNUNET_MessageHeader *msg;
91 const struct GNUNET_HELLO_Message *hello;
92 struct GNUNET_PeerIdentity *pid;
94 if (type != GNUNET_BLOCK_TYPE_DHT_HELLO)
96 if (block_size < sizeof (struct GNUNET_MessageHeader))
98 GNUNET_log_from (GNUNET_ERROR_TYPE_ERROR, "block-dht",
99 _("Block not of type %u\n"), GNUNET_BLOCK_TYPE_DHT_HELLO);
103 if (block_size != ntohs (msg->size))
105 GNUNET_log_from (GNUNET_ERROR_TYPE_ERROR, "block-dht",
106 _("Size mismatch for block\n"),
107 GNUNET_BLOCK_TYPE_DHT_HELLO);
111 pid = (struct GNUNET_PeerIdentity *) key;
112 if (GNUNET_OK != GNUNET_HELLO_get_id (hello, pid))
114 GNUNET_log_from (GNUNET_ERROR_TYPE_ERROR, "block-dht",
115 _("Block of type %u is malformed\n"),
116 GNUNET_BLOCK_TYPE_DHT_HELLO);
124 * Entry point for the plugin.
127 libgnunet_plugin_block_dht_init (void *cls)
129 static enum GNUNET_BLOCK_Type types[] =
131 GNUNET_BLOCK_TYPE_DHT_HELLO,
132 GNUNET_BLOCK_TYPE_ANY /* end of list */
134 struct GNUNET_BLOCK_PluginFunctions *api;
136 api = GNUNET_malloc (sizeof (struct GNUNET_BLOCK_PluginFunctions));
137 api->evaluate = &block_plugin_dht_evaluate;
138 api->get_key = &block_plugin_dht_get_key;
145 * Exit point from the plugin.
148 libgnunet_plugin_block_dht_done (void *cls)
150 struct GNUNET_TRANSPORT_PluginFunctions *api = cls;
156 /* end of plugin_block_dht.c */