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
|
/*
* random.c
* Random functions.
*
* Copyright (c) 2001 Marko Kreen
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $Id: random.c,v 1.5 2001/11/05 17:46:23 momjian Exp $
*/
#include <postgres.h>
#include "px.h"
#ifdef RAND_DEV
#include <errno.h>
#include <fcntl.h>
#include <unistd.h>
static int
safe_read(int fd, void *buf, size_t count)
{
int done = 0;
char *p = buf;
int res;
while (count)
{
res = read(fd, p, count);
if (res <= 0)
{
if (errno == EINTR)
continue;
return -1;
}
p += res;
done += res;
count -= res;
}
return done;
}
int
px_get_random_bytes(uint8 *dst, unsigned count)
{
int fd;
int res;
fd = open(RAND_DEV, O_RDONLY);
if (fd == -1)
return -1;
res = safe_read(fd, dst, count);
close(fd);
return res;
}
#endif /* RAND_DEV */
#ifdef RAND_SILLY
int
px_get_random_bytes(uint8 *dst, unsigned count)
{
int i;
for (i = 0; i < count; i++)
*dst++ = random();
return i;
}
#endif /* RAND_SILLY */
#ifdef RAND_OPENSSL
#include <openssl/evp.h>
#include <openssl/blowfish.h>
#include <openssl/rand.h>
#include <openssl/err.h>
static int openssl_random_init = 0;
int
px_get_random_bytes(uint8 *dst, unsigned count)
{
int res;
if (!openssl_random_init)
{
if (RAND_get_rand_method() == NULL)
RAND_set_rand_method(RAND_SSLeay());
openssl_random_init = 1;
}
/*
* OpenSSL random should re-feeded occasionally. From /dev/urandom
* preferrably.
*/
res = RAND_bytes(dst, count);
if (res > 0)
return count;
return -1;
}
#endif /* RAND_OPENSSL */
|
