Parser::getCompressedLabelOffset() - Code Metrics - ThrusterIO/dns - Measure and Improve Code Quality continuously with Scrutinizer

Parser::getCompressedLabelOffset() A
last analyzed 2016-01-23 20:50 UTC

↳ Parent: Parser

Complexity

Conditions	1
Paths	1

Size

Total Lines	7
Code Lines	4

Duplication

Lines	7
Ratio	100 %

Metric	Value
dl	7
loc	7
rs	9.4285
cc	1
eloc	4
nc	1
nop	2

<?php

namespace Thruster\Component\Dns;

/**
 * Class Parser
 *
 * @package Thruster\Component\Dns
 * @author  Aurimas Niekis <[email protected]>
 */
class Parser
{
    public function parseChunk($data, Message $message)
    {
        $message->data .= $data;

        if (null === $message->header->get('id')) {
            if (null === $this->parseHeader($message)) {
                return;
            }
        }

        if ($message->header->get('qdCount') != count($message->questions)) {
            if (null === $this->parseQuestion($message)) {
                return;
            }
        }

        if ($message->header->get('anCount') != count($message->answers)) {
            if (null === $this->parseAnswer($message)) {
                return;
            }
        }

        return $message;
    }

    public function parseHeader(Message $message) : Message
    {
        if (strlen($message->data) < 12) {
            return;
        }

        $header = substr($message->data, 0, 12);
        $message->consumed += 12;

        list($id, $fields, $qdCount, $anCount, $nsCount, $arCount) = array_values(unpack('n*', $header));

        $rcode  = $fields & bindec('1111');
        $z      = ($fields >> 4) & bindec('111');
        $ra     = ($fields >> 7) & 1;
        $rd     = ($fields >> 8) & 1;
        $tc     = ($fields >> 9) & 1;
        $aa     = ($fields >> 10) & 1;
        $opcode = ($fields >> 11) & bindec('1111');
        $qr     = ($fields >> 15) & 1;

        $vars = [
            'id'      => $id,
            'qdCount' => $qdCount,
            'anCount' => $anCount,
            'nsCount' => $nsCount,
            'arCount' => $arCount,
            'qr'      => $qr,
            'opcode'  => $opcode,
            'aa'      => $aa,
            'tc'      => $tc,
            'rd'      => $rd,
            'ra'      => $ra,
            'z'       => $z,
            'rcode'   => $rcode,
        ];

        foreach ($vars as $name => $value) {
            $message->header->set($name, $value);
        }

        return $message;
    }

    public function parseQuestion(Message $message)
    {
        if (strlen($message->data) < 2) {
            return;
        }

        $consumed = $message->consumed;

        list($labels, $consumed) = $this->readLabels($message->data, $consumed);

        if (null === $labels) {
            return;
        }

        if (strlen($message->data) - $consumed < 4) {
            return;
        }

        list($type, $class) = array_values(unpack('n*', substr($message->data, $consumed, 4)));
        $consumed += 4;

        $message->consumed = $consumed;

        $message->questions[] = [
            'name'  => implode('.', $labels),
            'type'  => $type,
            'class' => $class,
        ];

        if ($message->header->get('qdCount') != count($message->questions)) {
            return $this->parseQuestion($message);
        }

        return $message;
    }

    public function parseAnswer(Message $message) : Message
    {
        if (strlen($message->data) < 2) {
            return;
        }

        $consumed = $message->consumed;

        list($labels, $consumed) = $this->readLabels($message->data, $consumed);

        if (null === $labels) {
            return;
        }

        if (strlen($message->data) - $consumed < 10) {
            return;
        }

        list($type, $class) = array_values(unpack('n*', substr($message->data, $consumed, 4)));
        $consumed += 4;

        list($ttl) = array_values(unpack('N', substr($message->data, $consumed, 4)));
        $consumed += 4;

        list($rdLength) = array_values(unpack('n', substr($message->data, $consumed, 2)));
        $consumed += 2;

        $rdata = null;

        if (Message::TYPE_A === $type) {
            $ip = substr($message->data, $consumed, $rdLength);
            $consumed += $rdLength;

            $rdata = inet_ntop($ip);
        }

        if (Message::TYPE_CNAME === $type) {
            list($bodyLabels, $consumed) = $this->readLabels($message->data, $consumed);

            $rdata = implode('.', $bodyLabels);
        }

        $message->consumed = $consumed;

        $name   = implode('.', $labels);
        $ttl    = $this->signedLongToUnsignedLong($ttl);
        $record = new Record($name, $type, $class, $ttl, $rdata);

        $message->answers[] = $record;

        if ($message->header->get('anCount') != count($message->answers)) {
            return $this->parseAnswer($message);
        }

        return $message;
    }

    private function readLabels($data, $consumed)
    {
        $labels = [];

        while (true) {
            if ($this->isEndOfLabels($data, $consumed)) {
                $consumed += 1;
                break;
            }

            if ($this->isCompressedLabel($data, $consumed)) {
                list($newLabels, $consumed) = $this->getCompressedLabel($data, $consumed);
                $labels = array_merge($labels, $newLabels);
                break;
            }

            $length = ord(substr($data, $consumed, 1));
            $consumed += 1;

            if (strlen($data) - $consumed < $length) {
                return [null, null];
            }

            $labels[] = substr($data, $consumed, $length);
            $consumed += $length;
        }

        return [$labels, $consumed];
    }

    public function isEndOfLabels($data, $consumed) : bool
    {
        $length = ord(substr($data, $consumed, 1));

        return 0 === $length;
    }

    public function getCompressedLabel($data, $consumed) : array
    {
        list($nameOffset, $consumed) = $this->getCompressedLabelOffset($data, $consumed);
        list($labels) = $this->readLabels($data, $nameOffset);

        return [$labels, $consumed];
    }

    public function isCompressedLabel($data, $consumed) : bool

    {
        $mask = 0xc000; // 1100000000000000
        list($peek) = array_values(unpack('n', substr($data, $consumed, 2)));

        return (bool)($peek & $mask);
    }

    public function getCompressedLabelOffset($data, $consumed) : array

    {
        $mask = 0x3fff; // 0011111111111111
        list($peek) = array_values(unpack('n', substr($data, $consumed, 2)));

        return [$peek & $mask, $consumed + 2];
    }

    public function signedLongToUnsignedLong($i) : int
    {
        return $i & 0x80000000 ? $i - 0xffffffff : $i;
    }
}


1		<?php
2
3		namespace Thruster\Component\Dns;
4
5		/**
6		* Class Parser
7		*
8		* @package Thruster\Component\Dns
9		* @author Aurimas Niekis <[email protected]>
10		*/
11		class Parser
12		{
13		public function parseChunk($data, Message $message)
14		{
15		$message->data .= $data;
16
17		if (null === $message->header->get('id')) {
18		if (null === $this->parseHeader($message)) {
19		return;
20		}
21		}
22
23		if ($message->header->get('qdCount') != count($message->questions)) {
24		if (null === $this->parseQuestion($message)) {
25		return;
26		}
27		}
28
29		if ($message->header->get('anCount') != count($message->answers)) {
30		if (null === $this->parseAnswer($message)) {
31		return;
32		}
33		}
34
35		return $message;
36		}
37
38		public function parseHeader(Message $message) : Message
39		{
40		if (strlen($message->data) < 12) {
41		return;
42		}
43
44		$header = substr($message->data, 0, 12);
45		$message->consumed += 12;
46
47		list($id, $fields, $qdCount, $anCount, $nsCount, $arCount) = array_values(unpack('n*', $header));
48
49		$rcode = $fields & bindec('1111');
50		$z = ($fields >> 4) & bindec('111');
51		$ra = ($fields >> 7) & 1;
52		$rd = ($fields >> 8) & 1;
53		$tc = ($fields >> 9) & 1;
54		$aa = ($fields >> 10) & 1;
55		$opcode = ($fields >> 11) & bindec('1111');
56		$qr = ($fields >> 15) & 1;
57
58		$vars = [
59		'id' => $id,
60		'qdCount' => $qdCount,
61		'anCount' => $anCount,
62		'nsCount' => $nsCount,
63		'arCount' => $arCount,
64		'qr' => $qr,
65		'opcode' => $opcode,
66		'aa' => $aa,
67		'tc' => $tc,
68		'rd' => $rd,
69		'ra' => $ra,
70		'z' => $z,
71		'rcode' => $rcode,
72		];
73
74		foreach ($vars as $name => $value) {
75		$message->header->set($name, $value);
76		}
77
78		return $message;
79		}
80
81		public function parseQuestion(Message $message)
82		{
83		if (strlen($message->data) < 2) {
84		return;
85		}
86
87		$consumed = $message->consumed;
88
89		list($labels, $consumed) = $this->readLabels($message->data, $consumed);
90
91		if (null === $labels) {
92		return;
93		}
94
95		if (strlen($message->data) - $consumed < 4) {
96		return;
97		}
98
99		list($type, $class) = array_values(unpack('n*', substr($message->data, $consumed, 4)));
100		$consumed += 4;
101
102		$message->consumed = $consumed;
103
104		$message->questions[] = [
105		'name' => implode('.', $labels),
106		'type' => $type,
107		'class' => $class,
108		];
109
110		if ($message->header->get('qdCount') != count($message->questions)) {
111		return $this->parseQuestion($message);
112		}
113
114		return $message;
115		}
116
117		public function parseAnswer(Message $message) : Message
118		{
119		if (strlen($message->data) < 2) {
120		return;
121		}
122
123		$consumed = $message->consumed;
124
125		list($labels, $consumed) = $this->readLabels($message->data, $consumed);
126
127		if (null === $labels) {
128		return;
129		}
130
131		if (strlen($message->data) - $consumed < 10) {
132		return;
133		}
134
135		list($type, $class) = array_values(unpack('n*', substr($message->data, $consumed, 4)));
136		$consumed += 4;
137
138		list($ttl) = array_values(unpack('N', substr($message->data, $consumed, 4)));
139		$consumed += 4;
140
141		list($rdLength) = array_values(unpack('n', substr($message->data, $consumed, 2)));
142		$consumed += 2;
143
144		$rdata = null;
145
146		if (Message::TYPE_A === $type) {
147		$ip = substr($message->data, $consumed, $rdLength);
148		$consumed += $rdLength;
149
150		$rdata = inet_ntop($ip);
151		}
152
153		if (Message::TYPE_CNAME === $type) {
154		list($bodyLabels, $consumed) = $this->readLabels($message->data, $consumed);
155
156		$rdata = implode('.', $bodyLabels);
157		}
158
159		$message->consumed = $consumed;
160
161		$name = implode('.', $labels);
162		$ttl = $this->signedLongToUnsignedLong($ttl);
163		$record = new Record($name, $type, $class, $ttl, $rdata);
164
165		$message->answers[] = $record;
166
167		if ($message->header->get('anCount') != count($message->answers)) {
168		return $this->parseAnswer($message);
169		}
170
171		return $message;
172		}
173
174		private function readLabels($data, $consumed)
175		{
176		$labels = [];
177
178		while (true) {
179		if ($this->isEndOfLabels($data, $consumed)) {
180		$consumed += 1;
181		break;
182		}
183
184		if ($this->isCompressedLabel($data, $consumed)) {
185		list($newLabels, $consumed) = $this->getCompressedLabel($data, $consumed);
186		$labels = array_merge($labels, $newLabels);
187		break;
188		}
189
190		$length = ord(substr($data, $consumed, 1));
191		$consumed += 1;
192
193		if (strlen($data) - $consumed < $length) {
194		return [null, null];
195		}
196
197		$labels[] = substr($data, $consumed, $length);
198		$consumed += $length;
199		}
200
201		return [$labels, $consumed];
202		}
203
204		public function isEndOfLabels($data, $consumed) : bool
205		{
206		$length = ord(substr($data, $consumed, 1));
207
208		return 0 === $length;
209		}
210
211		public function getCompressedLabel($data, $consumed) : array
212		{
213		list($nameOffset, $consumed) = $this->getCompressedLabelOffset($data, $consumed);
214		list($labels) = $this->readLabels($data, $nameOffset);
215
216		return [$labels, $consumed];
217		}
218
219	View Code Duplication	public function isCompressedLabel($data, $consumed) : bool
		0 ignored issues – show Duplication introduced 2016-01-23 20:50 UTC by Report Bug Copy Issue Report This method seems to be duplicated in your project. Duplicated code is one of the most pungent code smells. If you need to duplicate the same code in three or more different places, we strongly encourage you to look into extracting the code into a single class or operation. You can also find more detailed suggestions in the “Code” section of your repository. Loading history...
220		{
221		$mask = 0xc000; // 1100000000000000
222		list($peek) = array_values(unpack('n', substr($data, $consumed, 2)));
223
224		return (bool)($peek & $mask);
225		}
226
227	View Code Duplication	public function getCompressedLabelOffset($data, $consumed) : array
		0 ignored issues – show Duplication introduced 2016-01-23 20:50 UTC by Report Bug Copy Issue Report This method seems to be duplicated in your project. Duplicated code is one of the most pungent code smells. If you need to duplicate the same code in three or more different places, we strongly encourage you to look into extracting the code into a single class or operation. You can also find more detailed suggestions in the “Code” section of your repository. Loading history...
228		{
229		$mask = 0x3fff; // 0011111111111111
230		list($peek) = array_values(unpack('n', substr($data, $consumed, 2)));
231
232		return [$peek & $mask, $consumed + 2];
233		}
234
235		public function signedLongToUnsignedLong($i) : int
236		{
237		return $i & 0x80000000 ? $i - 0xffffffff : $i;
238		}
239		}
240

ThrusterIO / dns

Parser::getCompressedLabelOffset() A last analyzed 2016-01-23 20:50 UTC

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Parser::getCompressedLabelOffset() A
last analyzed 2016-01-23 20:50 UTC