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Editing: siteguard-base.php

<?php

function siteguard_error_log( $message ) {
	$logfile = SITEGUARD_PATH . 'error.log';
	$f = @fopen( $logfile, 'a+' );
	if ( false != $f ) {
		fwrite( $f, date_i18n( 'Y/m/d H:i:s:' ) . $message . "\n" );
		fclose( $f );
	}
}

function siteguard_error_dump( $title, $obj ) {
	ob_start();
	var_dump( $obj );
	$msg = ob_get_contents( );
	ob_end_clean( );
	siteguard_error_log( "$title: $msg" );
}

function siteguard_check_multisite( ) {
	if ( ! is_multisite() ) {
		return true;
	}
	$message  = esc_html__( 'It does not support the multisite function of WordPress.', 'siteguard' );
	$error = new WP_Error( 'siteguard', $message );
	return $error;
}

class SiteGuard_Base {
	public static $ip_mode_items = array( '0', '1', '2', '3' );
	function __construct() {
	}
	function is_switch_value( $value ) {
		if ( '0' === $value || '1' === $value ) {
			return true;
		}
		return false;
	}
        function cvt_camma2ret( $value ) {
                $result = str_replace( ' ', '', $value );
                return    str_replace( ',', "\r\n", $result );
        }
        function cvt_ret2camma( $exclude ) {
                $result = str_replace( ' ', '', $exclude );
                $result = str_replace( ',', '', $result );
                $result = preg_replace( '/(\r\n){2,}/', "\r\n", $result );
                $result = preg_replace( '/\r\n$/', '', $result );
                $result = str_replace( "\r\n", ',', $result );
                $result = str_replace( "\r",   ',', $result );
                return    str_replace( "\n",   ',', $result );
        }
	function check_module( $name, $default = false ) {
		return true;
		# It does not work WP-CLI
		#if ( isset( $_SERVER['SERVER_SOFTWARE'] ) ) {
		#	return ( strpos( $_SERVER['SERVER_SOFTWARE'], 'Apache' ) !== false || strpos( $_SERVER['SERVER_SOFTWARE'], 'LiteSpeed' ) !== false);
		#} else {
		#	return $default;
		#}

# It does not work in FastCGI well.
		#$module = 'mod_' . $name;
		#return apache_mod_loaded( $module, $default );
		#if ( function_exists('phpinfo') ) {
		#	ob_start( );
		#	phpinfo(8);
		#	$phpinfo = ob_get_clean( );
		#	if ( false !== strpos( $phpinfo, $module ) ) {
		#		return true;
		#	}
		#}
		#return $default;
	}
	function is_private_ip( $ip ) {
		$private_ips = array(
			'10.0.0.0,10.255.255.255',
			'172.16.0.0,172.31.255.255',
			'192.168.0.0,192.168.255.255'
		);

$long_ip = ip2long( $ip );
		if ( -1 !== $long_ip && false !== $long_ip ) {
			$long_ip = sprintf( '%u', $long_ip );
			foreach( $private_ips as $private_ip ) {
				list( $start, $end ) = explode( ',', $private_ip );
				$long_start = ip2long( $start );
				$long_start = sprintf( '%u', $long_start );
				$long_end   = ip2long( $end );
				$long_end   = sprintf( '%u', $long_end );
				if ( $long_ip >= $long_start && $long_ip <= $long_end ) {
					return true;
				}
			}
		}
		return false;
	}
	function get_server_ip( ) {
		if ( isset( $_SERVER['SERVER_ADDR'] ) )	 {
			$ip = $_SERVER['SERVER_ADDR'];
			if ( false === $this->is_private_ip( $ip ) ) {
				if ( preg_match( '/[0-9.:]+/', $ip ) ) {
					return $ip;
				}
			}
		}

$url = 'http://inet-ip.info/ip';
		$options = array(
			'http' => array(
				'method'  => 'GET',
				'timeout' => 2,
			)
		);
		$ip = file_get_contents( $url, false, stream_context_create( $options ) );
		if ( false !== $ip ) {
			if ( preg_match( '/[0-9.:]+/', $ip ) ) {
				return $ip;
			}
		}

$host = parse_url( home_url( ), PHP_URL_HOST );
		if ( false !== $host && null !== $host ) {
			putenv( 'RES_OPTIONS=retrans:1 retry:1 timeout:2 attempts:1' );
			$ip = gethostbyname( $host );
			if ( $ip !== $host ) {
				if ( '127.0.0.1' !== $ip && '::1' !== $ip ) {
					if ( preg_match( '/[0-9.:]+/', $ip ) ) {
						return $ip;
					}
				}
			}
		}
		return false;
	}
	function get_ip( ) {
		global $siteguard_config;
		$ip_mode = $siteguard_config->get( 'ip_mode' );
		if ( ! in_array( $ip_mode, SiteGuard_Base::$ip_mode_items ) ) {
			$ip_mode = '0';
			$siteguard_config->set( 'ip_mode', $ip_mode );
			$siteguard_config->update( );
		}
		$ip_mode_num = intval( $ip_mode );
		$remote_addr = '127.0.0.1';
		if ( isset( $_SERVER['REMOTE_ADDR'] ) ) {
			$remote_addr = $_SERVER['REMOTE_ADDR'];
		}
		if ( '0' === $ip_mode ) {
			return $remote_addr;
		} 
		if ( ! isset( $_SERVER['HTTP_X_FORWARDED_FOR'] ) ) {
			return $remote_addr;
		}
		$xff = $_SERVER['HTTP_X_FORWARDED_FOR'];
		if ( empty( $xff ) ) {
			return $remote_addr;
		}
		$ips = explode( ',', $xff );
		$count = count( $ips );
		$idx = $count - $ip_mode_num;
		if ( $idx < 0 ) {
			return $remote_addr;
		}
		$ip = $ips[ $idx ];
		if ( ! filter_var($ip, FILTER_VALIDATE_IP ) ) {
			return $remote_addr;
		}
		return $ip;
	}
}

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