clrghouz/app/Classes/Protocol/DNS/RR.php

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<?php
namespace App\Classes\Protocol\DNS;
use Illuminate\Support\Arr;
use Illuminate\Support\Collection;
use App\Classes\Protocol\DNS;
final class RR
{
private const LOGKEY = 'PDR';
public Collection $labels;
public int $type;
public int $class;
private string $buf;
public function __construct(string $buf)
{
$this->buf = $buf;
$this->labels = collect();
$i = 0;
$domain = strstr($buf,"\x00",TRUE);
$i += strlen($domain)+1;
$this->type = Arr::get(unpack('n',substr($buf,$i,2)),1);
$this->class = Arr::get(unpack('n',substr($buf,$i+2,2)),1);
$i += 4;
switch ($this->type) {
case DNS::DNS_TYPE_CNAME:
case DNS::DNS_TYPE_NS:
case DNS::DNS_TYPE_DS:
case DNS::DNS_TYPE_SOA:
$i = 0;
while (($len=ord(substr($domain,$i++,1))) !== 0x00) {
$this->labels->push(substr($buf,$i,$len));
$i += $len;
}
break;
case DNS::DNS_TYPE_OPT:
// Domain is 0x00
$this->ttl = Arr::get(unpack('N',substr($buf,$i,4)),1);
$this->rddata_len = Arr::get(unpack('n',substr($buf,$i+4,2)),1);
$this->rddata = substr($buf,$i+6,$this->rddata_len);
break;
default:
dd(['unknown type:'.$this->type,'buf'=>$this->buf]);
}
}
public function __get(string $key): mixed
{
switch ($key) {
case 'length':
return strlen($this->buf);
default:
throw new \Exception(sprintf('%s:Unknown key [%s]',self::LOGKEY,$key));
}
}
public function __tostring(): string
{
return $this->buf;
}
}