Check if IP address is valid
This commit is contained in:
Claudio Sanches
parent
e005fe0207
commit
08db8cebec
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@ -66,6 +66,33 @@ class WC_Geolocation {
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return $new_value;
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}
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/**
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* Check if is a valid IP address.
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*
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* @since 3.0.6
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* @param string $ip_address IP address.
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* @return string|bool The valid IP address, otherwise false.
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*/
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private function is_ip_address( $ip_address ) {
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// WP 4.7+ only.
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if ( function_exists( 'rest_is_ip_address' ) ) {
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return rest_is_ip_address( $ip_address );
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}
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// Support for WordPress 4.4 to 4.6.
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if ( ! class_exists( 'Requests_IPv6', false ) ) {
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include_once( dirname( __FILE__ ) . '/vendor/class-requests-ipv6.php' );
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}
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$ipv4_pattern = '/^(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$/';
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if ( ! preg_match( $ipv4_pattern, $ip ) && ! Requests_IPv6::check_ipv6( $ip ) ) {
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return false;
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}
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return $ip;
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}
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/**
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* Get current user IP Address.
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* @return string
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@ -76,7 +103,7 @@ class WC_Geolocation {
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} elseif ( isset( $_SERVER['HTTP_X_FORWARDED_FOR'] ) ) {
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// Proxy servers can send through this header like this: X-Forwarded-For: client1, proxy1, proxy2
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// Make sure we always only send through the first IP in the list which should always be the client IP.
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return trim( current( explode( ',', $_SERVER['HTTP_X_FORWARDED_FOR'] ) ) );
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return (string) self::is_ip_address( trim( current( explode( ',', $_SERVER['HTTP_X_FORWARDED_FOR'] ) ) ) );
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} elseif ( isset( $_SERVER['REMOTE_ADDR'] ) ) {
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return $_SERVER['REMOTE_ADDR'];
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}
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@ -90,8 +117,12 @@ class WC_Geolocation {
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* @return string
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*/
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public static function get_external_ip_address() {
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$transient_name = 'external_ip_address_' . self::get_ip_address();
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$external_ip_address = get_transient( $transient_name );
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$external_ip_address = '0.0.0.0';
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if ( '' !== self::get_ip_address() ) {
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$transient_name = 'external_ip_address_' . self::get_ip_address();
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$external_ip_address = get_transient( $transient_name );
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}
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if ( false === $external_ip_address ) {
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$external_ip_address = '0.0.0.0';
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@ -0,0 +1,184 @@
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<?php
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/**
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* Class to validate and to work with IPv6 addresses
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*
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* @package Requests
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* @subpackage Utilities
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*/
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/**
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* Class to validate and to work with IPv6 addresses
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*
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* This was originally based on the PEAR class of the same name, but has been
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* entirely rewritten.
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*
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* @package Requests
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* @subpackage Utilities
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*/
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class Requests_IPv6 {
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/**
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* Uncompresses an IPv6 address
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*
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* RFC 4291 allows you to compress consecutive zero pieces in an address to
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* '::'. This method expects a valid IPv6 address and expands the '::' to
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* the required number of zero pieces.
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*
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* Example: FF01::101 -> FF01:0:0:0:0:0:0:101
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* ::1 -> 0:0:0:0:0:0:0:1
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*
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* @author Alexander Merz <alexander.merz@web.de>
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* @author elfrink at introweb dot nl
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* @author Josh Peck <jmp at joshpeck dot org>
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* @copyright 2003-2005 The PHP Group
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* @license http://www.opensource.org/licenses/bsd-license.php
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* @param string $ip An IPv6 address
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* @return string The uncompressed IPv6 address
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*/
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public static function uncompress( $ip ) {
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if ( substr_count( $ip, '::' ) !== 1 ) {
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return $ip;
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}
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list($ip1, $ip2) = explode( '::', $ip );
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$c1 = ( '' == $ip1 ) ? -1 : substr_count( $ip1, ':' );
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$c2 = ( '' == $ip2 ) ? -1 : substr_count( $ip2, ':' );
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if ( strpos( $ip2, '.' ) !== false ) {
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$c2++;
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}
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// ::
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if ( -1 === $c1 && -1 === $c2 ) {
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$ip = '0:0:0:0:0:0:0:0';
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} // ::xxx
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elseif ( -1 === $c1 ) {
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$fill = str_repeat( '0:', 7 - $c2 );
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$ip = str_replace( '::', $fill, $ip );
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} // xxx::
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elseif ( -1 === $c2 ) {
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$fill = str_repeat( ':0', 7 - $c1 );
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$ip = str_replace( '::', $fill, $ip );
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} // xxx::xxx
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else {
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$fill = ':' . str_repeat( '0:', 6 - $c2 - $c1 );
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$ip = str_replace( '::', $fill, $ip );
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}
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return $ip;
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}
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/**
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* Compresses an IPv6 address
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*
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* RFC 4291 allows you to compress consecutive zero pieces in an address to
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* '::'. This method expects a valid IPv6 address and compresses consecutive
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* zero pieces to '::'.
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*
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* Example: FF01:0:0:0:0:0:0:101 -> FF01::101
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* 0:0:0:0:0:0:0:1 -> ::1
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*
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* @see uncompress()
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* @param string $ip An IPv6 address
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* @return string The compressed IPv6 address
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*/
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public static function compress( $ip ) {
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// Prepare the IP to be compressed
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$ip = self::uncompress( $ip );
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$ip_parts = self::split_v6_v4( $ip );
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// Replace all leading zeros
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$ip_parts[0] = preg_replace( '/(^|:)0+([0-9])/', '\1\2', $ip_parts[0] );
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// Find bunches of zeros
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if ( preg_match_all( '/(?:^|:)(?:0(?::|$))+/', $ip_parts[0], $matches, PREG_OFFSET_CAPTURE ) ) {
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$max = 0;
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$pos = null;
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foreach ( $matches[0] as $match ) {
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if ( strlen( $match[0] ) > $max ) {
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$max = strlen( $match[0] );
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$pos = $match[1];
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}
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}
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$ip_parts[0] = substr_replace( $ip_parts[0], '::', $pos, $max );
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}
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if ( '' !== $ip_parts[1] ) {
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return implode( ':', $ip_parts );
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} else {
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return $ip_parts[0];
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}
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}
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/**
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* Splits an IPv6 address into the IPv6 and IPv4 representation parts
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*
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* RFC 4291 allows you to represent the last two parts of an IPv6 address
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* using the standard IPv4 representation
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*
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* Example: 0:0:0:0:0:0:13.1.68.3
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* 0:0:0:0:0:FFFF:129.144.52.38
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*
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* @param string $ip An IPv6 address
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* @return string[] [0] contains the IPv6 represented part, and [1] the IPv4 represented part
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*/
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protected static function split_v6_v4( $ip ) {
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if ( strpos( $ip, '.' ) !== false ) {
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$pos = strrpos( $ip, ':' );
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$ipv6_part = substr( $ip, 0, $pos );
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$ipv4_part = substr( $ip, $pos + 1 );
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return array( $ipv6_part, $ipv4_part );
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} else {
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return array( $ip, '' );
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}
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}
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/**
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* Checks an IPv6 address
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*
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* Checks if the given IP is a valid IPv6 address
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*
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* @param string $ip An IPv6 address
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* @return bool true if $ip is a valid IPv6 address
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*/
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public static function check_ipv6( $ip ) {
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$ip = self::uncompress( $ip );
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list($ipv6, $ipv4) = self::split_v6_v4( $ip );
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$ipv6 = explode( ':', $ipv6 );
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$ipv4 = explode( '.', $ipv4 );
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if ( count( $ipv6 ) === 8 && count( $ipv4 ) === 1 || count( $ipv6 ) === 6 && count( $ipv4 ) === 4 ) {
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foreach ( $ipv6 as $ipv6_part ) {
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// The section can't be empty
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if ( '' === $ipv6_part ) {
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return false;
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}
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// Nor can it be over four characters
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if ( strlen( $ipv6_part ) > 4 ) {
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return false;
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}
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// Remove leading zeros (this is safe because of the above)
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$ipv6_part = ltrim( $ipv6_part, '0' );
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if ( '' === $ipv6_part ) {
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$ipv6_part = '0';
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}
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// Check the value is valid
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$value = hexdec( $ipv6_part );
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if ( dechex( $value ) !== strtolower( $ipv6_part ) || $value < 0 || $value > 0xFFFF ) {
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return false;
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}
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}
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if ( count( $ipv4 ) === 4 ) {
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foreach ( $ipv4 as $ipv4_part ) {
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$value = (int) $ipv4_part;
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if ( (string) $value !== $ipv4_part || $value < 0 || $value > 0xFF ) {
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return false;
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}
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}
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}
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return true;
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} else {
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return false;
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}
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}
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}
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