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
|
/* rndlinux.c - raw random number for OSes with /dev/random
* Copyright (C) 1998, 2001, 2002, 2003 Free Software Foundation, Inc.
*
* This file is part of Libgcrypt.
*
* Libgcrypt is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* Libgcrypt 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include <errno.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/stat.h>
#ifdef HAVE_GETTIMEOFDAY
#include <sys/times.h>
#endif
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#if 0
#ifdef HAVE_LINUX_RANDOM_H
#include <sys/ioctl.h>
#include <asm/types.h>
#include <linux/random.h>
#endif
#endif
#include "types.h"
#include "g10lib.h"
#include "rand-internal.h"
static int open_device( const char *name, int minor );
int rndlinux_gather_random( void (*add)(const void*, size_t, int), int requester,
size_t length, int level );
#if 0
#ifdef HAVE_DEV_RANDOM_IOCTL
static ulong
get_entropy_count( int fd )
{
ulong count;
if( ioctl( fd, RNDGETENTCNT, &count ) == -1 )
log_fatal("ioctl(RNDGETENTCNT) failed: %s\n", strerror(errno) );
return count;
}
#endif
#endif
/****************
* Used to open the /dev/random devices (Linux, xBSD, Solaris (if it exists), ...)
*/
static int
open_device( const char *name, int minor )
{
int fd;
struct stat sb;
fd = open( name, O_RDONLY );
if( fd == -1 )
log_fatal("can't open %s: %s\n", name, strerror(errno) );
if( fstat( fd, &sb ) )
log_fatal("stat() off %s failed: %s\n", name, strerror(errno) );
/* Don't check device type for better portability */
/* if( (!S_ISCHR(sb.st_mode)) && (!S_ISFIFO(sb.st_mode)) )
log_fatal("invalid random device!\n" ); */
return fd;
}
int
rndlinux_gather_random( void (*add)(const void*, size_t, int), int requester,
size_t length, int level )
{
static int fd_urandom = -1;
static int fd_random = -1;
int fd;
int n;
int warn=0;
byte buffer[768];
if( level >= 2 ) {
if( fd_random == -1 )
fd_random = open_device( NAME_OF_DEV_RANDOM, 8 );
fd = fd_random;
}
else {
if( fd_urandom == -1 )
fd_urandom = open_device( NAME_OF_DEV_URANDOM, 9 );
fd = fd_urandom;
}
#if 0
#ifdef HAVE_DEV_RANDOM_IOCTL
log_info("entropy count of %d is %lu\n", fd, get_entropy_count(fd) );
#endif
#endif
while( length ) {
fd_set rfds;
struct timeval tv;
int rc;
FD_ZERO(&rfds);
FD_SET(fd, &rfds);
tv.tv_sec = 3;
tv.tv_usec = 0;
if( !(rc=select(fd+1, &rfds, NULL, NULL, &tv)) ) {
if( !warn )
{
_gcry_random_progress ("need_entropy", 'X', 0, (int)length);
warn = 1;
}
continue;
}
else if( rc == -1 ) {
log_error ("select() error: %s\n", strerror(errno));
continue;
}
do {
int nbytes = length < sizeof(buffer)? length : sizeof(buffer);
n = read(fd, buffer, nbytes );
if( n >= 0 && n > nbytes ) {
log_error("bogus read from random device (n=%d)\n", n );
n = nbytes;
}
} while( n == -1 && errno == EINTR );
if( n == -1 )
log_fatal("read error on random device: %s\n", strerror(errno));
(*add)( buffer, n, requester );
length -= n;
}
memset(buffer, 0, sizeof(buffer) );
return 0; /* success */
}
|
