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<?php
/* Icinga Web 2 | (c) 2013 Icinga Development Team | GPLv2+ */
namespace Icinga\Protocol\Nrpe;
class Packet
{
const QUERY = 0x01;
const RESPONSE = 0x02;
protected $version = 0x02;
protected $type;
protected $body;
protected static $randomBytes;
public function __construct($type, $body)
{
$this->type = $type;
$this->body = $body;
$this->regenerateRandomBytes();
}
// TODO: renew "from time to time" to allow long-running daemons
protected function regenerateRandomBytes()
{
self::$randomBytes = '';
for ($i = 0; $i < 4096; $i++) {
self::$randomBytes .= pack('N', mt_rand());
}
}
public static function createQuery($body)
{
$packet = new Packet(self::QUERY, $body);
return $packet;
}
protected function getFillString($length)
{
$max = strlen(self::$randomBytes) - $length;
return substr(self::$randomBytes, rand(0, $max), $length);
}
// TODO: WTF is SR? And 2324?
public function getBinary()
{
$version = pack('n', $this->version);
$type = pack('n', $this->type);
$dummycrc = "\x00\x00\x00\x00";
$result = "\x00\x00";
$result = pack('n', 2324);
$body = $this->body
. "\x00"
. $this->getFillString(1023 - strlen($this->body))
. 'SR';
$crc = pack(
'N',
crc32($version . $type . $dummycrc . $result . $body)
);
$bytes = $version . $type . $crc . $result . $body;
return $bytes;
}
public function __toString()
{
return $this->body;
}
}
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