119 lines
3.1 KiB
PHP
119 lines
3.1 KiB
PHP
<?php
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/*
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* Collection of public static functions to play with IP address
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* and IP blocks.
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*
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* @Author "Ashar Voultoiz" <hashar@altern.org>
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* @License GPL v2 or later
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*/
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// Some regex definition to "play" with IP address and IP address blocks
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// An IP is made of 4 bytes from x00 to xFF which is d0 to d255
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define( 'RE_IP_BYTE', '(25[0-5]|2[0-4]\d|1?\d{1,2})');
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define( 'RE_IP_ADD' , RE_IP_BYTE . '\.' . RE_IP_BYTE . '\.' . RE_IP_BYTE . '\.' . RE_IP_BYTE );
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// An IP block is an IP address and a prefix (d1 to d32)
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define( 'RE_IP_PREFIX' , '(3[0-2]|[12]?\d)');
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define( 'RE_IP_BLOCK', RE_IP_ADD . '\/' . RE_IP_PREFIX);
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class IP {
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/**
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* Validate an IP address.
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* @return boolean True if it is valid.
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*/
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public static function isValid( $ip ) {
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return preg_match( '/^' . RE_IP_ADD . '$/', $ip, $matches) ;
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}
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/**
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* Validate an IP Block.
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* @return boolean True if it is valid.
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*/
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public static function isValidBlock( $ipblock ) {
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return ( count(self::toArray($ipblock)) == 1 + 5 );
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}
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/**
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* Determine if an IP address really is an IP address, and if it is public,
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* i.e. not RFC 1918 or similar
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* Comes from ProxyTools.php
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*/
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public static function IsPublic( $ip ) {
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$n = IP::ToUnsigned( $ip );
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if ( !$n ) {
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return false;
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}
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// ip2long accepts incomplete addresses, as well as some addresses
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// followed by garbage characters. Check that it's really valid.
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if( $ip != long2ip( $n ) ) {
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return false;
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}
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static $privateRanges = false;
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if ( !$privateRanges ) {
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$privateRanges = array(
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array( '10.0.0.0', '10.255.255.255' ), # RFC 1918 (private)
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array( '172.16.0.0', '172.31.255.255' ), # "
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array( '192.168.0.0', '192.168.255.255' ), # "
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array( '0.0.0.0', '0.255.255.255' ), # this network
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array( '127.0.0.0', '127.255.255.255' ), # loopback
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);
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}
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foreach ( $privateRanges as $r ) {
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$start = IP::toUnsigned( $r[0] );
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$end = IP::toUnsigned( $r[1] );
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if ( $n >= $start && $n <= $end ) {
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return false;
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}
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}
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return true;
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}
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/**
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* Split out an IP block as an array of 4 bytes and a mask,
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* return false if it cant be determined
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*
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* @parameter $ip string A quad dotted IP address
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* @return array
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*/
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public static function toArray( $ipblock ) {
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if(! preg_match( '/^' . RE_IP_ADD . '(?:\/(?:'.RE_IP_PREFIX.'))?' . '$/', $ipblock, $matches ) ) {
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return false;
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} else {
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return $matches;
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}
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}
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/**
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* Return a zero-padded hexadecimal representation of an IP address
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* Comes from ProxyTools.php
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* @param $ip Quad dotted IP address.
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*/
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public static function toHex( $ip ) {
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$n = self::toUnsigned( $ip );
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if ( $n !== false ) {
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$n = sprintf( '%08X', $n );
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}
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return $n;
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}
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/**
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* Given an IP address in dotted-quad notation, returns an unsigned integer.
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* Like ip2long() except that it actually works and has a consistent error return value.
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* Comes from ProxyTools.php
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* @param $ip Quad dotted IP address.
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*/
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public static function toUnsigned( $ip ) {
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$n = ip2long( $ip );
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if ( $n == -1 || $n === false ) { # Return value on error depends on PHP version
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$n = false;
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} elseif ( $n < 0 ) {
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$n += pow( 2, 32 );
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}
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return $n;
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}
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}
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?>
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