1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
|
/*
This file is part of GNUnet
Copyright (C) 2017 GNUnet e.V.
GNUnet is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published
by the Free Software Foundation; either version 3, or (at your
option) any later version.
GNUnet is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNUnet; see the file COPYING. If not, write to the
Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
*/
/**
* @file consensus/plugin_block_consensus.c
* @brief consensus block, either nested block or marker
* @author Christian Grothoff
*/
#include "platform.h"
#include "consensus_protocol.h"
#include "gnunet_block_plugin.h"
#include "gnunet_block_group_lib.h"
/**
* Function called to validate a reply or a request. For
* request evaluation, simply pass "NULL" for the reply_block.
*
* @param cls closure
* @param ctx context
* @param type block type
* @param group block group to use
* @param eo control flags
* @param query original query (hash)
* @param xquery extrended query data (can be NULL, depending on type)
* @param xquery_size number of bytes in xquery
* @param reply_block response to validate
* @param reply_block_size number of bytes in reply block
* @return characterization of result
*/
static enum GNUNET_BLOCK_EvaluationResult
block_plugin_consensus_evaluate (void *cls,
struct GNUNET_BLOCK_Context *ctx,
enum GNUNET_BLOCK_Type type,
struct GNUNET_BLOCK_Group *group,
enum GNUNET_BLOCK_EvaluationOptions eo,
const struct GNUNET_HashCode *query,
const void *xquery,
size_t xquery_size,
const void *reply_block,
size_t reply_block_size)
{
if (reply_block_size < sizeof (struct ConsensusElement))
return GNUNET_BLOCK_EVALUATION_RESULT_INVALID;
const struct ConsensusElement *ce = reply_block;
if ( (0 != ce->marker) ||
(0 == ce->payload_type ) )
return GNUNET_BLOCK_EVALUATION_OK_MORE;
return GNUNET_BLOCK_evaluate (ctx,
type,
group,
eo,
query,
xquery,
xquery_size,
&ce[1],
reply_block_size - sizeof (struct ConsensusElement));
}
/**
* Function called to obtain the key for a block.
*
* @param cls closure
* @param type block type
* @param block block to get the key for
* @param block_size number of bytes in block
* @param key set to the key (query) for the given block
* @return #GNUNET_OK on success, #GNUNET_SYSERR if type not supported
* (or if extracting a key from a block of this type does not work)
*/
static int
block_plugin_consensus_get_key (void *cls,
enum GNUNET_BLOCK_Type type,
const void *block,
size_t block_size,
struct GNUNET_HashCode *key)
{
return GNUNET_SYSERR;
}
/**
* Entry point for the plugin.
*/
void *
libgnunet_plugin_block_consensus_init (void *cls)
{
static enum GNUNET_BLOCK_Type types[] =
{
GNUNET_BLOCK_TYPE_CONSENSUS_ELEMENT,
GNUNET_BLOCK_TYPE_ANY /* end of list */
};
struct GNUNET_BLOCK_PluginFunctions *api;
api = GNUNET_new (struct GNUNET_BLOCK_PluginFunctions);
api->evaluate = &block_plugin_consensus_evaluate;
api->get_key = &block_plugin_consensus_get_key;
api->types = types;
return api;
}
/**
* Exit point from the plugin.
*/
void *
libgnunet_plugin_block_consensus_done (void *cls)
{
struct GNUNET_BLOCK_PluginFunctions *api = cls;
GNUNET_free (api);
return NULL;
}
/* end of plugin_block_consensus.c */
|
