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#!/usr/bin/perl -w
#
# stunt userv-ipif standin which generates random data
#
# This file is part of secnet.
# See README for full list of copyright holders.
#
# secnet 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 of the License, or
# (at your option) any later version.
#
# secnet 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
# version 3 along with secnet; if not, see
# https://www.gnu.org/licenses/gpl.html.
use strict;
use POSIX;
open R, '/dev/urandom' or die $!;
system 'cat >/dev/null &';
sub randbytes ($) {
my ($count) = @_;
my $s;
my $r = read R, $s, $count;
die $! unless $r==$count;
return $s;
}
sub randbyteval () {
my $b = randbytes 1;
my ($r) = unpack 'C', $b;
return $r;
}
sub randvalue ($$) {
my ($min,$maxplus1) = @_;
my $b = randbyteval;
return floor(($b/256.0) * ($maxplus1-$min)) + $min;
}
for (;;) {
my $lenbits = randvalue 0,14;
my $len= (randbyteval << 8) | randbyteval;
$len &= (1 << $lenbits)-1;
my $data = randbytes $len;
if (randbyteval >= 0x80) {
$data =~ s{[\xc0\xdb]}{
$& eq "\xc0" ? "\xcb\xdc" :
$& eq "\xdb" ? "\xcb\xdd" :
die
}ge;
}
print "\xc0";
print $data;
STDOUT->flush;
}
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