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#!/usr/bin/perl
use threads;
use threads::shared;
use bytes;
use IO::Socket;
use strict;
my @dom = ("seed","bitcoin","sipa","be");
my $run :shared = 1;
sub go {
my ($idx) = @_;
my $runs = 0;
my $sock = IO::Socket::INET->new(
Proto => 'udp',
PeerPort => 53,
PeerAddr => "vps.sipa.be",
) or die "Could not create socket: $!\n";
while($run) {
my $id = int(rand(65536));
my $qr = 0;
my $opcode = 0;
my $aa = 0;
my $tc = 0;
my $rd = 0;
my $ra = 0;
my $z = 0;
my $rcode = 0;
my $qdcount = 1;
my $ancount = 0;
my $nscount = 0;
my $arcount = 0;
my $header = pack('nnnnnn',$id,1*$qr + 2*$opcode + 32*$aa + 64*$tc + 128*$rd + 256*$ra + 512*$z + 4096*$rcode, $qdcount, $ancount, $nscount, $arcount);
my $qtype = 1; # A record
my $qclass = 1; # IN class
my $query = (join("", map { chr(length($_)) . $_ } (@dom,""))) . pack('nn',$qtype,$qclass);
my $msg = $header . $query;
$sock->send($msg);
my $resp;
$runs++ if ($sock->recv($resp, 512, 0));
# $sock->close();
}
return $runs;
}
my @threads;
for my $i (0..500) {
$threads[$i] = threads->create(\&go, $i);
}
sleep 10;
$run=0;
my $runs = 0;
foreach my $thr (@threads) {
$runs += $thr->join();
}
print "$runs runs\n";