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package Rand::Urandom; |
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33176
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use strict; |
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use warnings; |
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use Config; |
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78
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950
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use POSIX qw(EINTR ENOSYS); |
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9484
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1584
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use Exporter qw(import); |
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866
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7
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8
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our @EXPORT_OK = qw(perl_rand rand_bytes); |
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our $VERSION = '0.01'; |
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## no critic (Subroutines::ProhibitSubroutinePrototypes) |
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sub use_urandom(;$) { |
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7
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100
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7
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0
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779
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my $max = shift || 1; |
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15
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7
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my $buf = rand_bytes(8); |
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7
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53
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my $n = unpack('Q', $buf); |
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7
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100
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return $n if ($max == 2**64); |
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6
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$max *= $n / 2**64; |
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6
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139
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return $max; |
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} |
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sub try_syscall { |
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8
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0
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my $num = shift; |
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50
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293
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if ($Config{'osname'} !~ m/linux/) { |
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0
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0
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return; |
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} |
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my $syscall = $Config{'archname'} =~ m/x86_64/ ? 318 : 355; |
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8
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13
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my $ret; |
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my $buf = ' ' x $num; |
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my $tries = 0; |
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8
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local $! = undef; |
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0
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do { |
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8
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$ret = syscall($syscall, $buf, $num, 0); |
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if ($! == ENOSYS) { |
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return; |
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} |
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0
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0
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0
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if ($ret != $num) { |
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0
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0
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warn "Rand::Urandom: huh, getrandom() returned $ret... trying again"; |
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0
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0
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$ret = -1; |
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0
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0
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$! = EINTR; |
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} |
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0
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0
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if ($tries++ > 100) { |
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0
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0
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warn 'Rand::Urandom: getrandom() looped lots, falling back'; |
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0
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0
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return; |
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} |
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} while ($ret == -1 && $! == EINTR); |
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52
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0
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0
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return $buf; |
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} |
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55
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sub rand_bytes { |
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8
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8
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1
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my $num = shift; |
57
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58
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8
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28
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my $buf = try_syscall($num); |
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8
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50
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21
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if (!$buf) { |
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8
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local $! = undef; |
61
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8
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50
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176
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my $file = -r '/dev/arandom' ? '/dev/arandom' : '/dev/urandom'; |
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8
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50
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400
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open(my $fh, '<:raw', $file) || die "Rand::Urandom: Can't open $file: $!"; |
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64
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8
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7883
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my $got = read($fh, $buf, $num); |
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8
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50
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33
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82
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if ($got == 0 || $got != $num) { |
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0
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0
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die "Rand::Urandom: failed to read from $file: $!"; |
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} |
68
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8
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50
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118
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close($fh) || die "Rand::Urandom: close failed: $!"; |
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} |
70
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8
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35
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return $buf; |
71
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} |
72
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73
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my $orig_rand; |
74
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sub perl_rand { |
75
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1
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1
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1
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1038
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goto &$orig_rand; |
76
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} |
77
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78
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sub BEGIN { |
79
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2
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2
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4
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$orig_rand = \&CORE::rand; |
80
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2
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2
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8
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no warnings 'redefine'; |
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2
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4
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2
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84
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81
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2
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38
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*CORE::GLOBAL::rand = \&use_urandom; |
82
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} |
83
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84
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85
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1; |
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__END__ |