defender-security / src / component / security-tweaks / servers / class-server.php

class-server.php in Defender Security – Malware Scanner, Login Security & Firewall 6.2.2, at src/component/security-tweaks/servers/class-server.php

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1	<?php
2	/**
3	* Responsible for determining the server software
4	* and type based on the environment or a self-ping mechanism.
5	*
6	* @package WP_Defender\Component\Security_Tweaks\Servers
7	*/
8
9	namespace WP_Defender\Component\Security_Tweaks\Servers;
10
11	/**
12	* The Server class provides methods to determine the type of server on which WordPress is running.
13	* It supports detection of server software through environment variables or by making a self-ping request.
14	*/
15	class Server {
16
17	public const CACHE_CURRENT_SERVER = 'defender_current_server';
18
19	/**
20	* Create a new instance of the Server_Factory class.
21	*
22	* @param mixed $server The server type.
23	*
24	* @return Server_Factory Returns an instance of Server_Factory.
25	*/
26	public static function create( $server ) {
27	return new Server_Factory( $server );
28	}
29
30	/**
31	* Determine the server software by making a self-ping request to the home URL.
32	*
33	* @param string $default_server_name The default server name to return if detection fails. Defaults to 'apache'.
34	*
35	* @return string Returns the server software type or the default server name if detection fails.
36	*/
37	public static function get_software_by_self_ping( $default_server_name = 'apache' ) {
38	$request = wp_remote_head(
39	home_url(),
40	array(
41	'user-agent' => defender_get_user_agent( 'Defender Self Ping' ),
42	// Most hosts don't really have valid ssl or ssl still pending.
43	'sslverify' => apply_filters( 'defender_ssl_verify', true ),
44	)
45	);
46	$server = wp_remote_retrieve_header( $request, 'server' );
47	$server = explode( '/', $server );
48
49	if ( isset( $server[0] ) ) {
50	$server = strtolower( $server[0] );
51	} else {
52	$server = $default_server_name;
53	}
54
55	return $server;
56	}
57
58	/**
59	* Get the server software from the SERVER_SOFTWARE server variable or by self-ping if not available.
60	*
61	* @return string Returns the server software type.
62	*/
63	public static function get_software() {
64	$software = defender_get_data_from_request( 'SERVER_SOFTWARE', 's' );
65	if ( ! is_string( $software ) \|\| '' === $software ) {
66	return self::get_software_by_self_ping();
67	}
68
69	$software = explode( ' ', $software );
70	$software = explode( '/', reset( $software ) );
71	if ( isset( $software[0] ) ) {
72	return strtolower( $software[0] );
73	}
74	return self::get_software_by_self_ping();
75	}
76
77	/**
78	* Determine the server.
79	*
80	* @return string
81	*/
82	public static function get_current_server() {
83	$url = home_url();
84	$server_type = get_site_transient( self::CACHE_CURRENT_SERVER );
85
86	if ( ! is_array( $server_type ) ) {
87	$server_type = array();
88	}
89
90	if ( isset( $server_type[ $url ] ) && is_string( $server_type[ $url ] ) && '' !== $server_type[ $url ] ) {
91	return strtolower( $server_type[ $url ] );
92	}
93
94	// Url should end with php.
95	global $is_apache, $is_nginx, $is_IIS, $is_iis7;
96
97	if ( $is_nginx ) {
98	$server = 'nginx';
99	} elseif ( $is_apache ) {
100	// Case the url is detecting php file.
101	if ( 'php' === pathinfo( $url, PATHINFO_EXTENSION ) ) {
102	$server = 'apache';
103	} else {
104	$server = self::get_software();
105	}
106	} elseif ( $is_iis7 \|\| $is_IIS ) {
107	$server = 'iis-7';
108	} else {
109	$server = self::get_software();
110	}
111
112	$server_type[ $url ] = $server;
113	set_site_transient( self::CACHE_CURRENT_SERVER, $server_type, 3600 );
114
115	return $server;
116	}
117
118	/**
119	* Check whether ping test failed or not.
120	*
121	* @param string $url The URL to ping.
122	*
123	* @return bool
124	*/
125	public static function ping_test_failed( $url ) {
126	$response = wp_remote_post( $url, array( 'user-agent' => 'WP Defender Self Ping Test' ) );
127
128	if ( is_wp_error( $response ) ) {
129	return true;
130	}
131
132	return 200 !== wp_remote_retrieve_response_code( $response );
133	}
134	}
135