function dnpt($ext_ip, $ext_prefix, $int_prefix)
{
$debug = false;
// This is not a complete solution!!!!!!!!!!!!!!!!!!!!!!!!!!
$ext_prefix = str_replace(":", "", $ext_prefix);
$int_prefix = str_replace(":", "", $int_prefix);
// hehe
$sauce = hexdec(split(":", $ext_ip)[4]);
$ext_c = icmpChecksum(hex2bin($ext_prefix));
$int_c = icmpChecksum(hex2bin($int_prefix));
if ($debug) {
print_r(unpack('n', $int_c));
}
$diff = unpack('n', $ext_c)[1] - unpack('n', $int_c)[1];
if ($diff < 0) {
$diff = 0xffff + $diff;
}
$diff = $sauce - $diff;
if ($debug) {
print bin2hex($ext_c);
print "\n";
print bin2hex($int_c);
print "\n";
print dechex($diff);
print "\n";
}
$out = split(":", $ext_ip);
$out[4] = dechex($diff);
$out = join($out, ":");
return $out;
}
$data .= "";
}
$bit = unpack('n*', $data);
$sum = array_sum($bit);
while ($sum >> 16) {
$sum = ($sum >> 16) + ($sum & 0xffff);
}
return pack('n*', ~$sum);
}
// Making the package
$type = "";
$code = "";
$checksum = "";
$identifier = "";
$seqNumber = "";
$data = "Scarface";
$package = $type . $code . $checksum . $identifier . $seqNumber . $data;
$checksum = icmpChecksum($package);
// Calculate the checksum
$package = $type . $code . $checksum . $identifier . $seqNumber . $data;
// And off to the sockets
$socket = socket_create(AF_INET, SOCK_RAW, 1);
socket_connect($socket, "www.google.com", null);
// If you're using below PHP 5, see the manual for the microtime_float
// function. Instead of just using the microtime() function.
$startTime = microtime(true);
socket_send($socket, $package, strlen($package), 0);
if (socket_read($socket, 255)) {
echo round(microtime(true) - $startTime, 4) . ' seconds';
}
socket_close($socket);
