TorDetect::doFallbackCheck() - Code Metrics - CyberLine/TorDetect - Measure and Improve Code Quality continuously with Scrutinizer

TorDetect::doFallbackCheck() C
last analyzed 2017-03-20 14:46 UTC

↳ Parent: TorDetect

Complexity

Conditions	7
Paths	9

Size

Total Lines	24
Code Lines	16

Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
dl	0
loc	24
rs	6.7272
c	0
b	0
f	0
cc	7
eloc	16
nc	9
nop	1

<?php

namespace TorDetect;

/**
 * Class TorDetect to determine if Remote User is using the TOR Network
 *
 * @author Alexander Over <[email protected]>
 */
class TorDetect
{
    /**
     * @var object
     */
    private static $instance;

    /**
     * @var string
     */
    private $target = null;

    /**
     * @var string
     */
    private $exithost = null;

    /**
     * @var integer
     */
    private $port = 443;

    /**
     * @var array
     */
    private $cache = array();

    /**
     * Constructor
     */
    private function __construct()
    {
        if (isset($_SERVER) && array_key_exists('REMOTE_ADDR', $_SERVER)) {
            $this->setTarget($_SERVER['REMOTE_ADDR']);
        }

        if (isset($_SERVER) && array_key_exists('SERVER_ADDR', $_SERVER)) {
            $this->setExithost($_SERVER["SERVER_ADDR"]);
            $this->setPort($_SERVER["SERVER_PORT"]);
        }
    }

    /**
     * @param $target
     *
     * @return $this
     * @throws \InvalidArgumentException
     */
    public function setTarget($target)
    {
        if (filter_var($target, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4)) {
            $this->target = implode('.', array_reverse(explode('.', $target)));
        } else {
            throw new \InvalidArgumentException(
                sprintf('"%s" is not a valid value for target', $target)
            );
        }

        return $this;
    }

    /**
     * @param $exithost
     * @return $this
     */
    public function setExithost($exithost)
    {
        $this->exithost = $this->prepareExithost($exithost);

        return $this;
    }

    /**
     * @param integer $port
     * @return $this
     */
    public function setPort($port)
    {
        $this->port = intval($port);

        return $this;
    }

    /**
     * @return object|TorDetect
     */
    public static function getInstance()
    {
        if (!(self::$instance instanceof self)) {
            self::$instance = new self;
        }

        return self::$instance;
    }

    /**
     * @return mixed
     */
    public function isTorActive()
    {
        if (null === $this->target) {
            throw new \InvalidArgumentException('No target set. Use setTarget($ip) first.');
        }

        if (!array_key_exists($this->target, $this->cache)) {
            $this->doFreshCheck();
        }

        return $this->cache[$this->target];
    }

    private function doFreshCheck()
    {
        if (null === $this->exithost) {
            throw new \InvalidArgumentException('No exithost set. Use setExithost($host) first.');
        }

        $query = array(
            $this->target,
            $this->port,
            $this->exithost,
            'ip-port.exitlist.torproject.org'
        );

        $dns = $this->dnsGetRecord($query);
        $isActive = $this->checkRecord($dns);

        $this->cache[$this->target] = $isActive;
    }

    /**
     * Wrapper for windows < 5.3 and, theoretically for
     * linux without dns_get_record() function
     *
     * @param array $address
     *
     * @return array
     */
    private function dnsGetRecord(array $address)
    {
        if (!function_exists('dns_get_record') && !function_exists('exec')) {
            throw new \LogicException(
                'no suitable methods for dns fetching found'
            );
        }

        $address = implode('.', $address);
        if (function_exists('dns_get_record')) {
            return dns_get_record($address, DNS_A);
        }

        return $this->doFallbackCheck($address);
    }

    /**
     * @param string $address
     * @return array
     */
    private function doFallbackCheck($address)
    {
        $output = $dns = array();
        $retval = false;
        if (strtoupper(substr(PHP_OS, 0, 3)) == 'WIN') {
            @exec('nslookup -type A ' . $address, $output, $retval);
// For example instead of
@mkdir($dir);

// Better use
if (@mkdir($dir) === false) {
    throw new \RuntimeException('The directory '.$dir.' could not be created.');
}
            if (!$retval && array_key_exists(1, $output)) {
0   == false // true
0   == null  // true
123 == false // false
123 == null  // false

// It is often better to use strict comparison
0 === false // false
0 === null  // false
                $output[0] = $output[1];
            }
        } else {
            @exec('host ' . $address, $output, $retval);
// For example instead of
@mkdir($dir);

// Better use
if (@mkdir($dir) === false) {
    throw new \RuntimeException('The directory '.$dir.' could not be created.');
}
        }

        if (!$retval && array_key_exists(0, $output)) {
0   == false // true
0   == null  // true
123 == false // false
123 == null  // false

// It is often better to use strict comparison
0 === false // false
0 === null  // false
            $explode = explode(' ', $output[0]);
            $result = $explode[count($explode) - 1];
            if (filter_var($result, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4)) {
                $dns[0]['ip'] = $result;
            }
            unset($explode, $result);
        }

        return $dns;
    }

    /**
     * @param $dns
     * @return bool
     */
    private function checkRecord($dns)
    {
        if (array_key_exists(0, $dns) && array_key_exists('ip', $dns[0])) {
            return ($dns[0]['ip'] === '127.0.0.2');
        }

        return false;
    }

    /**
     * @param string $exithost
     * @return string
     */
    private function prepareExithost($exithost)
    {
        return implode('.', array_reverse(explode('.', $exithost)));
    }
}


1			<?php
2
3			namespace TorDetect;
4
5			/**
6			* Class TorDetect to determine if Remote User is using the TOR Network
7			*
8			* @author Alexander Over <[email protected]>
9			*/
10			class TorDetect
11			{
12			/**
13			* @var object
14			*/
15			private static $instance;
16
17			/**
18			* @var string
19			*/
20			private $target = null;
21
22			/**
23			* @var string
24			*/
25			private $exithost = null;
26
27			/**
28			* @var integer
29			*/
30			private $port = 443;
31
32			/**
33			* @var array
34			*/
35			private $cache = array();
36
37			/**
38			* Constructor
39			*/
40			private function __construct()
41			{
42			if (isset($_SERVER) && array_key_exists('REMOTE_ADDR', $_SERVER)) {
43			$this->setTarget($_SERVER['REMOTE_ADDR']);
44			}
45
46			if (isset($_SERVER) && array_key_exists('SERVER_ADDR', $_SERVER)) {
47			$this->setExithost($_SERVER["SERVER_ADDR"]);
48			$this->setPort($_SERVER["SERVER_PORT"]);
49			}
50			}
51
52			/**
53			* @param $target
54			*
55			* @return $this
56			* @throws \InvalidArgumentException
57			*/
58			public function setTarget($target)
59			{
60			if (filter_var($target, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4)) {
61			$this->target = implode('.', array_reverse(explode('.', $target)));
62			} else {
63			throw new \InvalidArgumentException(
64			sprintf('"%s" is not a valid value for target', $target)
65			);
66			}
67
68			return $this;
69			}
70
71			/**
72			* @param $exithost
73			* @return $this
74			*/
75			public function setExithost($exithost)
76			{
77			$this->exithost = $this->prepareExithost($exithost);
78
79			return $this;
80			}
81
82			/**
83			* @param integer $port
84			* @return $this
85			*/
86			public function setPort($port)
87			{
88			$this->port = intval($port);
89
90			return $this;
91			}
92
93			/**
94			* @return object\|TorDetect
95			*/
96			public static function getInstance()
97			{
98			if (!(self::$instance instanceof self)) {
99			self::$instance = new self;
100			}
101
102			return self::$instance;
103			}
104
105			/**
106			* @return mixed
107			*/
108			public function isTorActive()
109			{
110			if (null === $this->target) {
111			throw new \InvalidArgumentException('No target set. Use setTarget($ip) first.');
112			}
113
114			if (!array_key_exists($this->target, $this->cache)) {
115			$this->doFreshCheck();
116			}
117
118			return $this->cache[$this->target];
119			}
120
121			private function doFreshCheck()
122			{
123			if (null === $this->exithost) {
124			throw new \InvalidArgumentException('No exithost set. Use setExithost($host) first.');
125			}
126
127			$query = array(
128			$this->target,
129			$this->port,
130			$this->exithost,
131			'ip-port.exitlist.torproject.org'
132			);
133
134			$dns = $this->dnsGetRecord($query);
135			$isActive = $this->checkRecord($dns);
136
137			$this->cache[$this->target] = $isActive;
138			}
139
140			/**
141			* Wrapper for windows < 5.3 and, theoretically for
142			* linux without dns_get_record() function
143			*
144			* @param array $address
145			*
146			* @return array
147			*/
148			private function dnsGetRecord(array $address)
149			{
150			if (!function_exists('dns_get_record') && !function_exists('exec')) {
151			throw new \LogicException(
152			'no suitable methods for dns fetching found'
153			);
154			}
155
156			$address = implode('.', $address);
157			if (function_exists('dns_get_record')) {
158			return dns_get_record($address, DNS_A);
159			}
160
161			return $this->doFallbackCheck($address);
162			}
163
164			/**
165			* @param string $address
166			* @return array
167			*/
168			private function doFallbackCheck($address)
169			{
170			$output = $dns = array();
171			$retval = false;
172			if (strtoupper(substr(PHP_OS, 0, 3)) == 'WIN') {
173			@exec('nslookup -type A ' . $address, $output, $retval);
			0 ignored issues – show Security Best Practice introduced 2016-05-24 11:23 UTC by Report Bug Copy Issue Report It seems like you do not handle an error condition here. This can introduce security issues, and is generally not recommended. If you suppress an error, we recommend checking for the error condition explicitly: // For example instead of @mkdir($dir); // Better use if (@mkdir($dir) === false) { throw new \RuntimeException('The directory '.$dir.' could not be created.'); } Loading history...
174			if (!$retval && array_key_exists(1, $output)) {
			0 ignored issues – show Bug Best Practice introduced 2016-05-24 11:23 UTC by Report Bug Copy Issue Report The expression `$retval` of type `integer\|null` is loosely compared to `false`; this is ambiguous if the integer can be zero. You might want to explicitly use `=== null` instead. In PHP, under loose comparison (like `==`, or `!=`, or `switch` conditions), values of different types might be equal. For `integer` values, zero is a special case, in particular the following results might be unexpected: 0 == false // true 0 == null // true 123 == false // false 123 == null // false // It is often better to use strict comparison 0 === false // false 0 === null // false Loading history...
175			$output[0] = $output[1];
176			}
177			} else {
178			@exec('host ' . $address, $output, $retval);
			0 ignored issues – show Security Best Practice introduced 2016-05-24 11:23 UTC by Report Bug Copy Issue Report It seems like you do not handle an error condition here. This can introduce security issues, and is generally not recommended. If you suppress an error, we recommend checking for the error condition explicitly: // For example instead of @mkdir($dir); // Better use if (@mkdir($dir) === false) { throw new \RuntimeException('The directory '.$dir.' could not be created.'); } Loading history...
179			}
180
181			if (!$retval && array_key_exists(0, $output)) {
			0 ignored issues – show Bug Best Practice introduced 2016-05-24 11:23 UTC by Report Bug Copy Issue Report The expression `$retval` of type `integer\|null` is loosely compared to `false`; this is ambiguous if the integer can be zero. You might want to explicitly use `=== null` instead. In PHP, under loose comparison (like `==`, or `!=`, or `switch` conditions), values of different types might be equal. For `integer` values, zero is a special case, in particular the following results might be unexpected: 0 == false // true 0 == null // true 123 == false // false 123 == null // false // It is often better to use strict comparison 0 === false // false 0 === null // false Loading history...
182			$explode = explode(' ', $output[0]);
183			$result = $explode[count($explode) - 1];
184			if (filter_var($result, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4)) {
185			$dns[0]['ip'] = $result;
186			}
187			unset($explode, $result);
188			}
189
190			return $dns;
191			}
192
193			/**
194			* @param $dns
195			* @return bool
196			*/
197			private function checkRecord($dns)
198			{
199			if (array_key_exists(0, $dns) && array_key_exists('ip', $dns[0])) {
200			return ($dns[0]['ip'] === '127.0.0.2');
201			}
202
203			return false;
204			}
205
206			/**
207			* @param string $exithost
208			* @return string
209			*/
210			private function prepareExithost($exithost)
211			{
212			return implode('.', array_reverse(explode('.', $exithost)));
213			}
214			}
215

CyberLine / TorDetect

TorDetect::doFallbackCheck() C last analyzed 2017-03-20 14:46 UTC

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TorDetect::doFallbackCheck() C
last analyzed 2017-03-20 14:46 UTC