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 include/gnunet_block_plugin.h
23 * @brief API for block plugins. Each block plugin must conform to
24 * the API specified by this header.
25 * @author Christian Grothoff
27 #ifndef PLUGIN_BLOCK_H
28 #define PLUGIN_BLOCK_H
30 #include "gnunet_util_lib.h"
31 #include "gnunet_container_lib.h"
32 #include "gnunet_block_lib.h"
36 * Function called to validate a reply or a request. For
37 * request evaluation, simply pass "NULL" for the reply_block.
38 * Note that it is assumed that the reply has already been
39 * matched to the key (and signatures checked) as it would
40 * be done with the "get_key" function.
43 * @param type block type
44 * @param query original query (hash)
45 * @param bf pointer to bloom filter associated with query; possibly updated (!)
46 * @param bf_mutator mutation value for bf
47 * @param xquery extrended query data (can be NULL, depending on type)
48 * @param xquery_size number of bytes in xquery
49 * @param reply_block response to validate
50 * @param reply_block_size number of bytes in reply block
51 * @return characterization of result
53 typedef enum GNUNET_BLOCK_EvaluationResult
54 (*GNUNET_BLOCK_EvaluationFunction) (void *cls,
55 enum GNUNET_BLOCK_Type type,
56 const GNUNET_HashCode * query,
57 struct GNUNET_CONTAINER_BloomFilter **
58 bf, int32_t bf_mutator,
59 const void *xquery, size_t xquery_size,
60 const void *reply_block,
61 size_t reply_block_size);
65 * Function called to obtain the key for a block.
68 * @param type block type
69 * @param block block to get the key for
70 * @param block_size number of bytes in block
71 * @param key set to the key (query) for the given block
72 * @return GNUNET_YES on success,
73 * GNUNET_NO if the block is malformed
74 * GNUNET_SYSERR if type not supported
75 * (or if extracting a key from a block of this type does not work)
78 (*GNUNET_BLOCK_GetKeyFunction) (void *cls,
79 enum GNUNET_BLOCK_Type type,
81 size_t block_size, GNUNET_HashCode * key);
86 * Each plugin is required to return a pointer to a struct of this
87 * type as the return value from its entry point.
89 struct GNUNET_BLOCK_PluginFunctions
93 * Closure for all of the callbacks.
98 * 0-terminated array of block types supported by this plugin.
100 const enum GNUNET_BLOCK_Type *types;
103 * Main function of a block plugin. Allows us to check if a
104 * block matches a query.
106 GNUNET_BLOCK_EvaluationFunction evaluate;
109 * Obtain the key for a given block (if possible).
111 GNUNET_BLOCK_GetKeyFunction get_key;