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,
53 enum GNUNET_BLOCK_Type type,
54 const GNUNET_HashCode * query,
55 struct GNUNET_CONTAINER_BloomFilter **bf,
59 const void *reply_block, size_t reply_block_size)
63 case GNUNET_BLOCK_TYPE_DHT_HELLO:
65 return GNUNET_BLOCK_EVALUATION_REQUEST_INVALID;
66 if (reply_block_size == 0)
67 return GNUNET_BLOCK_EVALUATION_REQUEST_VALID;
68 GNUNET_break (NULL == *bf);
69 return GNUNET_BLOCK_EVALUATION_OK_LAST;
71 return GNUNET_BLOCK_EVALUATION_TYPE_NOT_SUPPORTED;
77 * Function called to obtain the key for a block.
80 * @param type block type
81 * @param block block to get the key for
82 * @param block_size number of bytes in block
83 * @param key set to the key (query) for the given block
84 * @return GNUNET_OK on success, GNUNET_SYSERR if type not supported
85 * (or if extracting a key from a block of this type does not work)
88 block_plugin_dht_get_key (void *cls,
89 enum GNUNET_BLOCK_Type type,
91 size_t block_size, GNUNET_HashCode * key)
93 const struct GNUNET_MessageHeader *msg;
94 const struct GNUNET_HELLO_Message *hello;
95 struct GNUNET_PeerIdentity *pid;
97 if (type != GNUNET_BLOCK_TYPE_DHT_HELLO)
99 if (block_size < sizeof (struct GNUNET_MessageHeader))
101 GNUNET_log_from (GNUNET_ERROR_TYPE_ERROR,
103 _("Block not of type %u\n"), GNUNET_BLOCK_TYPE_DHT_HELLO);
107 if (block_size != ntohs (msg->size))
109 GNUNET_log_from (GNUNET_ERROR_TYPE_ERROR,
111 _("Size mismatch for block\n"),
112 GNUNET_BLOCK_TYPE_DHT_HELLO);
116 pid = (struct GNUNET_PeerIdentity *) key;
117 if (GNUNET_OK != GNUNET_HELLO_get_id (hello, pid))
119 GNUNET_log_from (GNUNET_ERROR_TYPE_ERROR,
121 _("Block of type %u is malformed\n"),
122 GNUNET_BLOCK_TYPE_DHT_HELLO);
130 * Entry point for the plugin.
133 libgnunet_plugin_block_dht_init (void *cls)
135 static enum GNUNET_BLOCK_Type types[] =
137 GNUNET_BLOCK_TYPE_DHT_HELLO,
138 GNUNET_BLOCK_TYPE_ANY /* end of list */
140 struct GNUNET_BLOCK_PluginFunctions *api;
142 api = GNUNET_malloc (sizeof (struct GNUNET_BLOCK_PluginFunctions));
143 api->evaluate = &block_plugin_dht_evaluate;
144 api->get_key = &block_plugin_dht_get_key;
151 * Exit point from the plugin.
154 libgnunet_plugin_block_dht_done (void *cls)
156 struct GNUNET_TRANSPORT_PluginFunctions *api = cls;
162 /* end of plugin_block_dht.c */