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