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Support dumping records as part of outgoing binary DNS message #124

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Merged
WyriHaximus merged 1 commit into from
Jan 30, 2019
Merged

Support dumping records as part of outgoing binary DNS message #124

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113 changes: 107 additions & 6 deletions src/Protocol/BinaryDumper.php
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Original file line number Diff line number Diff line change
Expand Up @@ -2,21 +2,33 @@

namespace React\Dns\Protocol;

use React\Dns\Model\Message;
use React\Dns\Model\HeaderBag;
use React\Dns\Model\Message;
use React\Dns\Model\Record;

class BinaryDumper
{
/**
* @param Message $message
* @return string
*/
public function toBinary(Message $message)
{
$data = '';

$data .= $this->headerToBinary($message->header);
$data .= $this->questionToBinary($message->questions);
$data .= $this->recordsToBinary($message->answers);
$data .= $this->recordsToBinary($message->authority);
$data .= $this->recordsToBinary($message->additional);

return $data;
}

/**
* @param HeaderBag $header
* @return string
*/
private function headerToBinary(HeaderBag $header)
{
$data = '';
Expand All @@ -43,20 +55,109 @@ private function headerToBinary(HeaderBag $header)
return $data;
}

/**
* @param array $questions
* @return string
*/
private function questionToBinary(array $questions)
{
$data = '';

foreach ($questions as $question) {
$labels = explode('.', $question['name']);
foreach ($labels as $label) {
$data .= chr(strlen($label)).$label;
$data .= $this->domainNameToBinary($question['name']);
$data .= pack('n*', $question['type'], $question['class']);
}

return $data;
}

/**
* @param Record[] $records
* @return string
*/
private function recordsToBinary(array $records)
{
$data = '';

foreach ($records as $record) {
/* @var $record Record */
switch ($record->type) {
case Message::TYPE_A:
case Message::TYPE_AAAA:
$binary = \inet_pton($record->data);
break;
case Message::TYPE_CNAME:
case Message::TYPE_NS:
case Message::TYPE_PTR:
$binary = $this->domainNameToBinary($record->data);
break;
case Message::TYPE_TXT:
$binary = $this->textsToBinary($record->data);
break;
case Message::TYPE_MX:
$binary = \pack(
'n',
$record->data['priority']
);
$binary .= $this->domainNameToBinary($record->data['target']);
break;
case Message::TYPE_SRV:
$binary = \pack(
'n*',
$record->data['priority'],
$record->data['weight'],
$record->data['port']
);
$binary .= $this->domainNameToBinary($record->data['target']);
break;
case Message::TYPE_SOA:
$binary = $this->domainNameToBinary($record->data['mname']);
$binary .= $this->domainNameToBinary($record->data['rname']);
$binary .= \pack(
'N*',
$record->data['serial'],
$record->data['refresh'],
$record->data['retry'],
$record->data['expire'],
$record->data['minimum']
);
break;
default:
// RDATA is already stored as binary value for unknown record types
$binary = $record->data;
}
$data .= "\x00";

$data .= pack('n*', $question['type'], $question['class']);
$data .= $this->domainNameToBinary($record->name);
$data .= \pack('nnNn', $record->type, $record->class, $record->ttl, \strlen($binary));
$data .= $binary;
}

return $data;
}

/**
* @param string[] $texts
* @return string
*/
private function textsToBinary(array $texts)
{
$data = '';
foreach ($texts as $text) {
$data .= \chr(\strlen($text)) . $text;
}
return $data;
}

/**
* @param string $host
* @return string
*/
private function domainNameToBinary($host)
{
if ($host === '') {
return "\0";
}

return $this->textsToBinary(\explode('.', $host . '.'));
}
}
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