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
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
|
/*
This file is part of GNUnet.
Copyright (C)
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 rps/gnunet-service-rps_sampler_elem.h
* @brief sampler element implementation
* @author Julius Bünger
*/
#ifndef RPS_SAMPLER_ELEM_H
#define RPS_SAMPLER_ELEM_H
#include <inttypes.h>
/***********************************************************************
* WARNING: This section needs to be reviewed regarding the use of
* functions providing (pseudo)randomness!
***********************************************************************/
/**
* Used to indicate whether a sampler element is empty.
*/
enum RPS_SamplerEmpty
{
NOT_EMPTY = 0x0,
EMPTY = 0x1
};
/**
* A sampler element sampling one PeerID at a time.
*/
struct RPS_SamplerElement
{
/**
* Min-wise linear permutation used by this sampler.
*
* This is an key later used by a hmac.
*/
struct GNUNET_CRYPTO_AuthKey auth_key;
/**
* The PeerID this sampler currently samples.
*/
struct GNUNET_PeerIdentity peer_id;
/**
* The according hash value of this PeerID.
*/
struct GNUNET_HashCode peer_id_hash;
/**
* Time of last request.
*/
struct GNUNET_TIME_Absolute last_client_request;
/**
* Flag that indicates that we are not holding a valid PeerID right now.
*/
enum RPS_SamplerEmpty is_empty;
/**
* 'Birth'
*/
struct GNUNET_TIME_Absolute birth;
/**
* How many times a PeerID was put in this sampler.
*/
uint32_t num_peers;
/**
* How many times this sampler changed the peer_id.
*/
uint32_t num_change;
/**
* The file name this sampler element should log to
*/
char *file_name;
};
/**
* Reinitialise a previously initialised sampler element.
*
* @param sampler pointer to the memory that keeps the value.
*/
void
RPS_sampler_elem_reinit (struct RPS_SamplerElement *sampler_el);
/**
* Create a sampler element and initialise it.
*
* In this implementation this means choosing an auth_key for later use in
* a hmac at random.
*
* @return a newly created RPS_SamplerElement which currently holds no id.
*/
struct RPS_SamplerElement *
RPS_sampler_elem_create (void);
/**
* Destroy a sampler element.
*
* @param sampler_elem the element to destroy
*/
void
RPS_sampler_elem_destroy (struct RPS_SamplerElement *sampler_elem);
/**
* Input an PeerID into the given sampler element.
*
* @param sampler the sampler the @a s_elem belongs to.
* Needed to know the
*/
void
RPS_sampler_elem_next (struct RPS_SamplerElement *s_elem,
const struct GNUNET_PeerIdentity *new_ID);
/**
* Initialise the min-wise independent function of the given sampler element.
*
* @param s_elem the sampler element
* @param auth_key the key to use
*/
void
RPS_sampler_elem_set (struct RPS_SamplerElement *s_elem,
struct GNUNET_CRYPTO_AuthKey auth_key);
#endif /* RPS_SAMPLER_ELEM_H */
/* end of gnunet-service-rps.c */
|
