563 lines
17 KiB
PHP
563 lines
17 KiB
PHP
<?php
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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][0-9]|1[0-9][0-9]|0?[0-9]?[0-9])');
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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 IPv4 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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// For IPv6 canonicalization (NOT for strict validation; these are quite lax!)
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define( 'RE_IPV6_WORD', '([0-9A-Fa-f]{1,4})' );
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define( 'RE_IPV6_GAP', ':(?:0+:)*(?::(?:0+:)*)?' );
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define( 'RE_IPV6_V4_PREFIX', '0*' . RE_IPV6_GAP . '(?:ffff:)?' );
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// An IPv6 block is an IP address and a prefix (d1 to d128)
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define( 'RE_IPV6_PREFIX', '(12[0-8]|1[01][0-9]|[1-9]?\d)');
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// An IPv6 IP is made up of 8 octets. However abbreviations like "::" can be used.
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// This is lax! Number of octets/double colons validation not done.
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define( 'RE_IPV6_ADD',
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'(' .
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':(:' . RE_IPV6_WORD . '){1,7}' . // IPs that start with ":"
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'|' .
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RE_IPV6_WORD . '(:{1,2}' . RE_IPV6_WORD . '|::$){1,7}' . // IPs that don't start with ":"
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')'
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);
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define( 'RE_IPV6_BLOCK', RE_IPV6_ADD . '\/' . RE_IPV6_PREFIX );
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// This might be useful for regexps used elsewhere, matches any IPv6 or IPv6 address or network
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define( 'IP_ADDRESS_STRING',
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'(?:' .
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RE_IP_ADD . '(\/' . RE_IP_PREFIX . '|)' . // IPv4
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'|' .
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RE_IPV6_ADD . '(\/' . RE_IPV6_PREFIX . '|)' . // IPv6
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')'
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);
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/**
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* A 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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class IP {
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/**
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* Given a string, determine if it as valid IP
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* Unlike isValid(), this looks for networks too
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* @param $ip IP address.
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* @return string
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*/
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public static function isIPAddress( $ip ) {
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if ( !$ip ) return false;
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if ( is_array( $ip ) ) {
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throw new MWException( "invalid value passed to " . __METHOD__ );
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}
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// IPv6 IPs with two "::" strings are ambiguous and thus invalid
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return preg_match( '/^' . IP_ADDRESS_STRING . '$/', $ip) && ( substr_count($ip, '::') < 2 );
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}
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public static function isIPv6( $ip ) {
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if ( !$ip ) return false;
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if( is_array( $ip ) ) {
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throw new MWException( "invalid value passed to " . __METHOD__ );
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}
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$doubleColons = substr_count($ip, '::');
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// IPv6 IPs with two "::" strings are ambiguous and thus invalid
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return preg_match( '/^' . RE_IPV6_ADD . '(\/' . RE_IPV6_PREFIX . '|)$/', $ip)
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&& ( $doubleColons == 1 || substr_count($ip,':') == 7 );
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}
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public static function isIPv4( $ip ) {
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if ( !$ip ) return false;
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return preg_match( '/^' . RE_IP_ADD . '(\/' . RE_IP_PREFIX . '|)$/', $ip);
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}
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/**
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* Given an IP address in dotted-quad notation, returns an IPv6 octet.
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* See http://www.answers.com/topic/ipv4-compatible-address
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* IPs with the first 92 bits as zeros are reserved from IPv6
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* @param $ip quad-dotted IP address.
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* @return string
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*/
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public static function IPv4toIPv6( $ip ) {
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if ( !$ip ) return null;
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// Convert only if needed
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if ( self::isIPv6( $ip ) ) return $ip;
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// IPv4 CIDRs
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if ( strpos( $ip, '/' ) !== false ) {
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$parts = explode( '/', $ip, 2 );
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if ( count( $parts ) != 2 ) {
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return false;
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}
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$network = self::toUnsigned( $parts[0] );
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if ( $network !== false && is_numeric( $parts[1] ) && $parts[1] >= 0 && $parts[1] <= 32 ) {
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$bits = $parts[1] + 96;
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return self::toOctet( $network ) . "/$bits";
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} else {
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return false;
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}
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}
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return self::toOctet( self::toUnsigned( $ip ) );
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}
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/**
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* Given an IPv6 address in octet notation, returns an unsigned integer.
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* @param $ip octet ipv6 IP address.
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* @return string
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*/
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public static function toUnsigned6( $ip ) {
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if ( !$ip ) return null;
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$ip = explode(':', self::sanitizeIP( $ip ) );
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$r_ip = '';
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foreach ($ip as $v) {
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$r_ip .= str_pad( $v, 4, 0, STR_PAD_LEFT );
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}
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$r_ip = wfBaseConvert( $r_ip, 16, 10 );
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return $r_ip;
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}
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/**
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* Given an IPv6 address in octet notation, returns the expanded octet.
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* IPv4 IPs will be trimmed, thats it...
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* @param $ip octet ipv6 IP address.
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* @return string
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*/
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public static function sanitizeIP( $ip ) {
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$ip = trim( $ip );
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if ( $ip === '' ) return null;
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// Trim and return IPv4 addresses
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if ( self::isIPv4($ip) ) return $ip;
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// Only IPv6 addresses can be expanded
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if ( !self::isIPv6($ip) ) return $ip;
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// Remove any whitespaces, convert to upper case
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$ip = strtoupper( $ip );
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// Expand zero abbreviations
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$abbrevPos = strpos( $ip, '::' );
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if ( $abbrevPos !== false ) {
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// If the '::' is at the beginning...
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if( $abbrevPos == 0 ) {
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$repeat = '0:'; $extra = ''; $pad = 9; // 7+2 (due to '::')
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// If the '::' is at the end...
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} else if( $abbrevPos == (strlen($ip)-2) ) {
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$repeat = ':0'; $extra = ''; $pad = 9; // 7+2 (due to '::')
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// If the '::' is at the end...
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} else {
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$repeat = ':0'; $extra = ':'; $pad = 8; // 6+2 (due to '::')
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}
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$ip = str_replace('::', str_repeat($repeat, $pad-substr_count($ip,':')).$extra, $ip);
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}
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// Remove leading zereos from each bloc as needed
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$ip = preg_replace( '/(^|:)0+' . RE_IPV6_WORD . '/', '$1$2', $ip );
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return $ip;
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}
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/**
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* Given an unsigned integer, returns an IPv6 address in octet notation
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* @param $ip integer IP address.
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* @return string
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*/
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public static function toOctet( $ip_int ) {
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// Convert to padded uppercase hex
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$ip_hex = wfBaseConvert($ip_int, 10, 16, 32, false);
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// Separate into 8 octets
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$ip_oct = substr( $ip_hex, 0, 4 );
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for ($n=1; $n < 8; $n++) {
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$ip_oct .= ':' . substr($ip_hex, 4*$n, 4);
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}
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// NO leading zeroes
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$ip_oct = preg_replace( '/(^|:)0+' . RE_IPV6_WORD . '/', '$1$2', $ip_oct );
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return $ip_oct;
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}
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/**
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* Convert an IPv4 or IPv6 hexadecimal representation back to readable format
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*/
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public static function formatHex( $hex ) {
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if ( substr( $hex, 0, 3 ) == 'v6-' ) {
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return self::hexToOctet( $hex );
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} else {
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return self::hexToQuad( $hex );
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}
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}
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/**
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* Given a hexadecimal number, returns to an IPv6 address in octet notation
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* @param $ip string hex IP
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* @return string
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*/
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public static function hextoOctet( $ip_hex ) {
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// Convert to padded uppercase hex
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$ip_hex = str_pad( strtoupper($ip_hex), 32, '0');
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// Separate into 8 octets
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$ip_oct = substr( $ip_hex, 0, 4 );
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for ($n=1; $n < 8; $n++) {
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$ip_oct .= ':' . substr($ip_hex, 4*$n, 4);
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}
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// NO leading zeroes
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$ip_oct = preg_replace( '/(^|:)0+' . RE_IPV6_WORD . '/', '$1$2', $ip_oct );
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return $ip_oct;
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}
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/**
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* Converts a hexadecimal number to an IPv4 address in octet notation
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* @param $ip string Hex IP
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* @return string
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*/
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public static function hexToQuad( $ip ) {
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// Converts a hexadecimal IP to nnn.nnn.nnn.nnn format
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$s = '';
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for ( $i = 0; $i < 4; $i++ ) {
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if ( $s !== '' ) {
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$s .= '.';
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}
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$s .= base_convert( substr( $ip, $i * 2, 2 ), 16, 10 );
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}
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return $s;
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}
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/**
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* Convert a network specification in IPv6 CIDR notation to an integer network and a number of bits
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* @return array(string, int)
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*/
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public static function parseCIDR6( $range ) {
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# Expand any IPv6 IP
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$parts = explode( '/', IP::sanitizeIP( $range ), 2 );
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if ( count( $parts ) != 2 ) {
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return array( false, false );
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}
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$network = self::toUnsigned6( $parts[0] );
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if ( $network !== false && is_numeric( $parts[1] ) && $parts[1] >= 0 && $parts[1] <= 128 ) {
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$bits = $parts[1];
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if ( $bits == 0 ) {
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$network = 0;
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} else {
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# Native 32 bit functions WONT work here!!!
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# Convert to a padded binary number
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$network = wfBaseConvert( $network, 10, 2, 128 );
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# Truncate the last (128-$bits) bits and replace them with zeros
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$network = str_pad( substr( $network, 0, $bits ), 128, 0, STR_PAD_RIGHT );
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# Convert back to an integer
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$network = wfBaseConvert( $network, 2, 10 );
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}
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} else {
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$network = false;
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$bits = false;
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}
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return array( $network, $bits );
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}
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/**
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* Given a string range in a number of formats, return the start and end of
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* the range in hexadecimal. For IPv6.
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*
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* Formats are:
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* 2001:0db8:85a3::7344/96 CIDR
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* 2001:0db8:85a3::7344 - 2001:0db8:85a3::7344 Explicit range
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* 2001:0db8:85a3::7344/96 Single IP
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* @return array(string, int)
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*/
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public static function parseRange6( $range ) {
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# Expand any IPv6 IP
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$range = IP::sanitizeIP( $range );
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if ( strpos( $range, '/' ) !== false ) {
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# CIDR
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list( $network, $bits ) = self::parseCIDR6( $range );
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if ( $network === false ) {
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$start = $end = false;
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} else {
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$start = wfBaseConvert( $network, 10, 16, 32, false );
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# Turn network to binary (again)
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$end = wfBaseConvert( $network, 10, 2, 128 );
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# Truncate the last (128-$bits) bits and replace them with ones
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$end = str_pad( substr( $end, 0, $bits ), 128, 1, STR_PAD_RIGHT );
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# Convert to hex
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$end = wfBaseConvert( $end, 2, 16, 32, false );
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# see toHex() comment
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$start = "v6-$start"; $end = "v6-$end";
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}
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} elseif ( strpos( $range, '-' ) !== false ) {
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# Explicit range
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list( $start, $end ) = array_map( 'trim', explode( '-', $range, 2 ) );
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$start = self::toUnsigned6( $start ); $end = self::toUnsigned6( $end );
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if ( $start > $end ) {
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$start = $end = false;
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} else {
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$start = wfBaseConvert( $start, 10, 16, 32, false );
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$end = wfBaseConvert( $end, 10, 16, 32, false );
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}
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# see toHex() comment
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$start = "v6-$start"; $end = "v6-$end";
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} else {
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# Single IP
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$start = $end = self::toHex( $range );
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}
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if ( $start === false || $end === false ) {
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return array( false, false );
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} else {
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return array( $start, $end );
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}
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}
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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( $ip ) {
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return ( preg_match( '/^' . RE_IP_ADD . '$/', $ip) || preg_match( '/^' . RE_IPV6_ADD . '$/', $ip) );
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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 = self::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 = self::toUnsigned( $r[0] );
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$end = self::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 can't be determined
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*
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* @param $ip string A quad dotted/octet IP address
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* @return array
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*/
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public static function toArray( $ipblock ) {
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$matches = array();
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if( preg_match( '/^' . RE_IP_ADD . '(?:\/(?:'.RE_IP_PREFIX.'))?' . '$/', $ipblock, $matches ) ) {
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return $matches;
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} else if ( preg_match( '/^' . RE_IPV6_ADD . '(?:\/(?:'.RE_IPV6_PREFIX.'))?' . '$/', $ipblock, $matches ) ) {
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return $matches;
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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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* Return a zero-padded hexadecimal representation of an IP address.
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*
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* Hexadecimal addresses are used because they can easily be extended to
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* IPv6 support. To separate the ranges, the return value from this
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* function for an IPv6 address will be prefixed with "v6-", a non-
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* hexadecimal string which sorts after the IPv4 addresses.
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*
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* @param $ip Quad dotted/octet IP address.
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* @return hexidecimal
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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 = self::isIPv6($ip) ? "v6-" . wfBaseConvert( $n, 10, 16, 32, false ) : wfBaseConvert( $n, 10, 16, 8, false );
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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/octet 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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* @return integer
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*/
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public static function toUnsigned( $ip ) {
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// Use IPv6 functions if needed
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if ( self::isIPv6( $ip ) ) {
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return self::toUnsigned6( $ip );
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}
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if ( $ip == '255.255.255.255' ) {
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$n = -1;
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} else {
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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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}
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}
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if ( $n < 0 ) {
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$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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* Convert a dotted-quad IP to a signed integer
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* Returns false on failure
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*/
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public static function toSigned( $ip ) {
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if ( $ip == '255.255.255.255' ) {
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$n = -1;
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} else {
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$n = ip2long( $ip );
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if ( $n == -1 ) {
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$n = false;
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}
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}
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return $n;
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}
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/**
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* Convert a network specification in CIDR notation to an integer network and a number of bits
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* @return array(string, int)
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*/
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public static function parseCIDR( $range ) {
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$parts = explode( '/', $range, 2 );
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if ( count( $parts ) != 2 ) {
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return array( false, false );
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}
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$network = self::toSigned( $parts[0] );
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if ( $network !== false && is_numeric( $parts[1] ) && $parts[1] >= 0 && $parts[1] <= 32 ) {
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$bits = $parts[1];
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if ( $bits == 0 ) {
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$network = 0;
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} else {
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$network &= ~((1 << (32 - $bits)) - 1);
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}
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# Convert to unsigned
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if ( $network < 0 ) {
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$network += pow( 2, 32 );
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}
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} else {
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$network = false;
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$bits = false;
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}
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return array( $network, $bits );
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}
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/**
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* Given a string range in a number of formats, return the start and end of
|
|
* the range in hexadecimal.
|
|
*
|
|
* Formats are:
|
|
* 1.2.3.4/24 CIDR
|
|
* 1.2.3.4 - 1.2.3.5 Explicit range
|
|
* 1.2.3.4 Single IP
|
|
*
|
|
* 2001:0db8:85a3::7344/96 CIDR
|
|
* 2001:0db8:85a3::7344 - 2001:0db8:85a3::7344 Explicit range
|
|
* 2001:0db8:85a3::7344 Single IP
|
|
* @return array(string, int)
|
|
*/
|
|
public static function parseRange( $range ) {
|
|
// Use IPv6 functions if needed
|
|
if ( self::isIPv6( $range ) ) {
|
|
return self::parseRange6( $range );
|
|
}
|
|
if ( strpos( $range, '/' ) !== false ) {
|
|
# CIDR
|
|
list( $network, $bits ) = self::parseCIDR( $range );
|
|
if ( $network === false ) {
|
|
$start = $end = false;
|
|
} else {
|
|
$start = sprintf( '%08X', $network );
|
|
$end = sprintf( '%08X', $network + pow( 2, (32 - $bits) ) - 1 );
|
|
}
|
|
} elseif ( strpos( $range, '-' ) !== false ) {
|
|
# Explicit range
|
|
list( $start, $end ) = array_map( 'trim', explode( '-', $range, 2 ) );
|
|
if( self::isIPAddress( $start ) && self::isIPAddress( $end ) ) {
|
|
$start = self::toUnsigned( $start ); $end = self::toUnsigned( $end );
|
|
if ( $start > $end ) {
|
|
$start = $end = false;
|
|
} else {
|
|
$start = sprintf( '%08X', $start );
|
|
$end = sprintf( '%08X', $end );
|
|
}
|
|
} else {
|
|
$start = $end = false;
|
|
}
|
|
} else {
|
|
# Single IP
|
|
$start = $end = self::toHex( $range );
|
|
}
|
|
if ( $start === false || $end === false ) {
|
|
return array( false, false );
|
|
} else {
|
|
return array( $start, $end );
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Determine if a given IPv4/IPv6 address is in a given CIDR network
|
|
* @param $addr The address to check against the given range.
|
|
* @param $range The range to check the given address against.
|
|
* @return bool Whether or not the given address is in the given range.
|
|
*/
|
|
public static function isInRange( $addr, $range ) {
|
|
// Convert to IPv6 if needed
|
|
$hexIP = self::toHex( $addr );
|
|
list( $start, $end ) = self::parseRange( $range );
|
|
return (strcmp($hexIP, $start) >= 0 &&
|
|
strcmp($hexIP, $end) <= 0);
|
|
}
|
|
|
|
/**
|
|
* Convert some unusual representations of IPv4 addresses to their
|
|
* canonical dotted quad representation.
|
|
*
|
|
* This currently only checks a few IPV4-to-IPv6 related cases. More
|
|
* unusual representations may be added later.
|
|
*
|
|
* @param $addr something that might be an IP address
|
|
* @return valid dotted quad IPv4 address or null
|
|
*/
|
|
public static function canonicalize( $addr ) {
|
|
if ( self::isValid( $addr ) )
|
|
return $addr;
|
|
|
|
// Turn mapped addresses from ::ce:ffff:1.2.3.4 to 1.2.3.4
|
|
if ( strpos($addr,':') !==false && strpos($addr,'.') !==false ) {
|
|
$addr = substr( $addr, strrpos($addr,':')+1 );
|
|
if( self::isIPv4($addr) ) return $addr;
|
|
}
|
|
|
|
// IPv6 loopback address
|
|
$m = array();
|
|
if ( preg_match( '/^0*' . RE_IPV6_GAP . '1$/', $addr, $m ) )
|
|
return '127.0.0.1';
|
|
|
|
// IPv4-mapped and IPv4-compatible IPv6 addresses
|
|
if ( preg_match( '/^' . RE_IPV6_V4_PREFIX . '(' . RE_IP_ADD . ')$/i', $addr, $m ) )
|
|
return $m[1];
|
|
if ( preg_match( '/^' . RE_IPV6_V4_PREFIX . RE_IPV6_WORD . ':' . RE_IPV6_WORD . '$/i', $addr, $m ) )
|
|
return long2ip( ( hexdec( $m[1] ) << 16 ) + hexdec( $m[2] ) );
|
|
|
|
return null; // give up
|
|
}
|
|
}
|