, Aaron Schulz */ // Some regex definition to "play" with IP address and IP address blocks // An IPv4 address is made of 4 bytes from x00 to xFF which is d0 to d255 define( 'RE_IP_BYTE', '(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|0?[0-9]?[0-9])' ); define( 'RE_IP_ADD', RE_IP_BYTE . '\.' . RE_IP_BYTE . '\.' . RE_IP_BYTE . '\.' . RE_IP_BYTE ); // An IPv4 block is an IP address and a prefix (d1 to d32) define( 'RE_IP_PREFIX', '(3[0-2]|[12]?\d)' ); define( 'RE_IP_BLOCK', RE_IP_ADD . '\/' . RE_IP_PREFIX ); // An IPv6 address is made up of 8 words (each x0000 to xFFFF). // However, the "::" abbreviation can be used on consecutive x0000 words. define( 'RE_IPV6_WORD', '([0-9A-Fa-f]{1,4})' ); define( 'RE_IPV6_PREFIX', '(12[0-8]|1[01][0-9]|[1-9]?\d)'); define( 'RE_IPV6_ADD', '(?:' . // starts with "::" (including "::") ':(?::|(?::' . RE_IPV6_WORD . '){1,7})' . '|' . // ends with "::" (except "::") RE_IPV6_WORD . '(?::' . RE_IPV6_WORD . '){0,6}::' . '|' . // contains one "::" in the middle, ending in "::WORD" RE_IPV6_WORD . '(?::' . RE_IPV6_WORD . '){0,5}' . '::' . RE_IPV6_WORD . '|' . // contains one "::" in the middle, not ending in "::WORD" (regex for PCRE 4.0+) RE_IPV6_WORD . '(?::(?P:(?P))?' . RE_IPV6_WORD . '(?!:(?P=abn))){1,5}' . ':' . RE_IPV6_WORD . '(?P=iabn)' . // NOTE: (?!(?P=abn)) fails iff "::" used twice; (?P=iabn) passes iff a "::" was found. '|' . // contains no "::" RE_IPV6_WORD . '(?::' . RE_IPV6_WORD . '){7}' . ')' // NOTE: With PCRE 7.2+, we can combine the two '"::" in the middle' cases into: // RE_IPV6_WORD . '(?::((?(-1)|:))?' . RE_IPV6_WORD . '){1,6}(?(-2)|^)' // This also improves regex concatenation by using relative references. ); // An IPv6 block is an IP address and a prefix (d1 to d128) define( 'RE_IPV6_BLOCK', RE_IPV6_ADD . '\/' . RE_IPV6_PREFIX ); // For IPv6 canonicalization (NOT for strict validation; these are quite lax!) define( 'RE_IPV6_GAP', ':(?:0+:)*(?::(?:0+:)*)?' ); define( 'RE_IPV6_V4_PREFIX', '0*' . RE_IPV6_GAP . '(?:ffff:)?' ); // This might be useful for regexps used elsewhere, matches any IPv6 or IPv6 address or network define( 'IP_ADDRESS_STRING', '(?:' . RE_IP_ADD . '(?:\/' . RE_IP_PREFIX . ')?' . // IPv4 '|' . RE_IPV6_ADD . '(?:\/' . RE_IPV6_PREFIX . ')?' . // IPv6 ')' ); /** * A collection of public static functions to play with IP address * and IP blocks. */ class IP { /** * Determine if a string is as valid IP address or network (CIDR prefix). * SIIT IPv4-translated addresses are rejected. * Note: canonicalize() tries to convert translated addresses to IPv4. * * @param $ip String: possible IP address * @return Boolean */ public static function isIPAddress( $ip ) { return (bool)preg_match( '/^' . IP_ADDRESS_STRING . '$/', $ip ); } /** * Given a string, determine if it as valid IP in IPv6 only. * Note: Unlike isValid(), this looks for networks too. * * @param $ip String: possible IP address * @return Boolean */ public static function isIPv6( $ip ) { return (bool)preg_match( '/^' . RE_IPV6_ADD . '(?:\/' . RE_IPV6_PREFIX . ')?$/', $ip ); } /** * Given a string, determine if it as valid IP in IPv4 only. * Note: Unlike isValid(), this looks for networks too. * * @param $ip String: possible IP address * @return Boolean */ public static function isIPv4( $ip ) { return (bool)preg_match( '/^' . RE_IP_ADD . '(?:\/' . RE_IP_PREFIX . ')?$/', $ip ); } /** * Validate an IP address. Ranges are NOT considered valid. * SIIT IPv4-translated addresses are rejected. * Note: canonicalize() tries to convert translated addresses to IPv4. * * @param $ip String * @return Boolean: True if it is valid. */ public static function isValid( $ip ) { return ( preg_match( '/^' . RE_IP_ADD . '$/', $ip ) || preg_match( '/^' . RE_IPV6_ADD . '$/', $ip ) ); } /** * Validate an IP Block (valid address WITH a valid prefix). * SIIT IPv4-translated addresses are rejected. * Note: canonicalize() tries to convert translated addresses to IPv4. * * @param $ipblock String * @return Boolean: True if it is valid. */ public static function isValidBlock( $ipblock ) { return ( preg_match( '/^' . RE_IPV6_BLOCK . '$/', $ipblock ) || preg_match( '/^' . RE_IP_BLOCK . '$/', $ipblock ) ); } /** * Convert an IP into a nice standard form. * IPv6 addresses in octet notation are expanded to 8 words. * IPv4 addresses are just trimmed. * * @param $ip String: IP address in quad or octet form (CIDR or not). * @return String */ public static function sanitizeIP( $ip ) { $ip = trim( $ip ); if ( $ip === '' ) { return null; } if ( self::isIPv4( $ip ) || !self::isIPv6( $ip ) ) { return $ip; // nothing else to do for IPv4 addresses or invalid ones } // Remove any whitespaces, convert to upper case $ip = strtoupper( $ip ); // Expand zero abbreviations $abbrevPos = strpos( $ip, '::' ); if ( $abbrevPos !== false ) { // We know this is valid IPv6. Find the last index of the // address before any CIDR number (e.g. "a:b:c::/24"). $CIDRStart = strpos( $ip, "/" ); $addressEnd = ( $CIDRStart !== false ) ? $CIDRStart - 1 : strlen( $ip ) - 1; // If the '::' is at the beginning... if ( $abbrevPos == 0 ) { $repeat = '0:'; $extra = ( $ip == '::' ) ? '0' : ''; // for the address '::' $pad = 9; // 7+2 (due to '::') // If the '::' is at the end... } elseif ( $abbrevPos == ( $addressEnd - 1 ) ) { $repeat = ':0'; $extra = ''; $pad = 9; // 7+2 (due to '::') // If the '::' is in the middle... } else { $repeat = ':0'; $extra = ':'; $pad = 8; // 6+2 (due to '::') } $ip = str_replace( '::', str_repeat( $repeat, $pad - substr_count( $ip, ':' ) ) . $extra, $ip ); } // Remove leading zereos from each bloc as needed $ip = preg_replace( '/(^|:)0+(' . RE_IPV6_WORD . ')/', '$1$2', $ip ); return $ip; } /** * Given an unsigned integer, returns an IPv6 address in octet notation * * @param $ip_int String: IP address. * @return String */ public static function toOctet( $ip_int ) { return self::hexToOctet( wfBaseConvert( $ip_int, 10, 16, 32, false ) ); } /** * Convert an IPv4 or IPv6 hexadecimal representation back to readable format * * @param $hex String: number, with "v6-" prefix if it is IPv6 * @return String: quad-dotted (IPv4) or octet notation (IPv6) */ public static function formatHex( $hex ) { if ( substr( $hex, 0, 3 ) == 'v6-' ) { // IPv6 return self::hexToOctet( substr( $hex, 3 ) ); } else { // IPv4 return self::hexToQuad( $hex ); } } /** * Converts a hexadecimal number to an IPv6 address in octet notation * * @param $ip_hex String: pure hex (no v6- prefix) * @return String (of format a:b:c:d:e:f:g:h) */ public static function hexToOctet( $ip_hex ) { // Pad hex to 32 chars (128 bits) $ip_hex = str_pad( strtoupper( $ip_hex ), 32, '0', STR_PAD_LEFT ); // Separate into 8 words $ip_oct = substr( $ip_hex, 0, 4 ); for ( $n = 1; $n < 8; $n++ ) { $ip_oct .= ':' . substr( $ip_hex, 4 * $n, 4 ); } // NO leading zeroes $ip_oct = preg_replace( '/(^|:)0+(' . RE_IPV6_WORD . ')/', '$1$2', $ip_oct ); return $ip_oct; } /** * Converts a hexadecimal number to an IPv4 address in quad-dotted notation * * @param $ip_hex String: pure hex * @return String (of format a.b.c.d) */ public static function hexToQuad( $ip_hex ) { // Pad hex to 8 chars (32 bits) $ip_hex = str_pad( strtoupper( $ip_hex ), 8, '0', STR_PAD_LEFT ); // Separate into four quads $s = ''; for ( $i = 0; $i < 4; $i++ ) { if ( $s !== '' ) { $s .= '.'; } $s .= base_convert( substr( $ip_hex, $i * 2, 2 ), 16, 10 ); } return $s; } /** * Determine if an IP address really is an IP address, and if it is public, * i.e. not RFC 1918 or similar * Comes from ProxyTools.php * * @param $ip String * @return Boolean */ public static function isPublic( $ip ) { if ( self::isIPv6( $ip ) ) { return self::isPublic6( $ip ); } $n = self::toUnsigned( $ip ); if ( !$n ) { return false; } // ip2long accepts incomplete addresses, as well as some addresses // followed by garbage characters. Check that it's really valid. if ( $ip != long2ip( $n ) ) { return false; } static $privateRanges = false; if ( !$privateRanges ) { $privateRanges = array( array( '10.0.0.0', '10.255.255.255' ), # RFC 1918 (private) array( '172.16.0.0', '172.31.255.255' ), # " array( '192.168.0.0', '192.168.255.255' ), # " array( '0.0.0.0', '0.255.255.255' ), # this network array( '127.0.0.0', '127.255.255.255' ), # loopback ); } foreach ( $privateRanges as $r ) { $start = self::toUnsigned( $r[0] ); $end = self::toUnsigned( $r[1] ); if ( $n >= $start && $n <= $end ) { return false; } } return true; } /** * Determine if an IPv6 address really is an IP address, and if it is public, * i.e. not RFC 4193 or similar * * @param $ip String * @return Boolean */ private static function isPublic6( $ip ) { static $privateRanges = false; if ( !$privateRanges ) { $privateRanges = array( array( 'fc::', 'fdff:ffff:ffff:ffff:ffff:ffff:ffff:ffff' ), # RFC 4193 (local) array( '0:0:0:0:0:0:0:1', '0:0:0:0:0:0:0:1' ), # loopback ); } $n = self::toHex( $ip ); foreach ( $privateRanges as $r ) { $start = self::toHex( $r[0] ); $end = self::toHex( $r[1] ); if ( $n >= $start && $n <= $end ) { return false; } } return true; } /** * Return a zero-padded upper case hexadecimal representation of an IP address. * * Hexadecimal addresses are used because they can easily be extended to * IPv6 support. To separate the ranges, the return value from this * function for an IPv6 address will be prefixed with "v6-", a non- * hexadecimal string which sorts after the IPv4 addresses. * * @param $ip String: quad dotted/octet IP address. * @return String */ public static function toHex( $ip ) { if ( self::isIPv6( $ip ) ) { $n = 'v6-' . self::IPv6ToRawHex( $ip ); } else { $n = self::toUnsigned( $ip ); if ( $n !== false ) { $n = wfBaseConvert( $n, 10, 16, 8, false ); } } return $n; } /** * Given an IPv6 address in octet notation, returns a pure hex string. * * @param $ip String: octet ipv6 IP address. * @return String: pure hex (uppercase) */ private static function IPv6ToRawHex( $ip ) { $ip = self::sanitizeIP( $ip ); if ( !$ip ) { return null; } $r_ip = ''; foreach ( explode( ':', $ip ) as $v ) { $r_ip .= str_pad( $v, 4, 0, STR_PAD_LEFT ); } return $r_ip; } /** * Given an IP address in dotted-quad/octet notation, returns an unsigned integer. * Like ip2long() except that it actually works and has a consistent error return value. * Comes from ProxyTools.php * * @param $ip String: quad dotted IP address. * @return Mixed: string/int/false */ public static function toUnsigned( $ip ) { if ( self::isIPv6( $ip ) ) { $n = self::toUnsigned6( $ip ); } else { $n = ip2long( $ip ); if ( $n < 0 ) { $n += pow( 2, 32 ); } } return $n; } private static function toUnsigned6( $ip ) { return wfBaseConvert( self::IPv6ToRawHex( $ip ), 16, 10 ); } /** * Convert a network specification in CIDR notation * to an integer network and a number of bits * * @param $range String: IP with CIDR prefix * @return array(int or string, int) */ public static function parseCIDR( $range ) { if ( self::isIPv6( $range ) ) { return self::parseCIDR6( $range ); } $parts = explode( '/', $range, 2 ); if ( count( $parts ) != 2 ) { return array( false, false ); } list( $network, $bits ) = $parts; $network = ip2long( $network ); if ( $network !== false && is_numeric( $bits ) && $bits >= 0 && $bits <= 32 ) { if ( $bits == 0 ) { $network = 0; } else { $network &= ~( ( 1 << ( 32 - $bits ) ) - 1); } # Convert to unsigned if ( $network < 0 ) { $network += pow( 2, 32 ); } } else { $network = false; $bits = false; } return array( $network, $bits ); } /** * 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 * @param $range String: IP range * @return array(string, string) */ public static function parseRange( $range ) { // CIDR notation if ( strpos( $range, '/' ) !== false ) { if ( self::isIPv6( $range ) ) { return self::parseRange6( $range ); } 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 ); } // Explicit range } elseif ( strpos( $range, '-' ) !== false ) { list( $start, $end ) = array_map( 'trim', explode( '-', $range, 2 ) ); if ( self::isIPv6( $start ) && self::isIPv6( $end ) ) { return self::parseRange6( $range ); } if ( self::isIPv4( $start ) && self::isIPv4( $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 ); } } /** * Convert a network specification in IPv6 CIDR notation to an * integer network and a number of bits * * @return array(string, int) */ private static function parseCIDR6( $range ) { # Explode into $parts = explode( '/', IP::sanitizeIP( $range ), 2 ); if ( count( $parts ) != 2 ) { return array( false, false ); } list( $network, $bits ) = $parts; $network = self::IPv6ToRawHex( $network ); if ( $network !== false && is_numeric( $bits ) && $bits >= 0 && $bits <= 128 ) { if ( $bits == 0 ) { $network = "0"; } else { # Native 32 bit functions WONT work here!!! # Convert to a padded binary number $network = wfBaseConvert( $network, 16, 2, 128 ); # Truncate the last (128-$bits) bits and replace them with zeros $network = str_pad( substr( $network, 0, $bits ), 128, 0, STR_PAD_RIGHT ); # Convert back to an integer $network = wfBaseConvert( $network, 2, 10 ); } } else { $network = false; $bits = false; } return array( $network, (int)$bits ); } /** * Given a string range in a number of formats, return the * start and end of the range in hexadecimal. For IPv6. * * Formats are: * 2001:0db8:85a3::7344/96 CIDR * 2001:0db8:85a3::7344 - 2001:0db8:85a3::7344 Explicit range * 2001:0db8:85a3::7344/96 Single IP * @return array(string, string) */ private static function parseRange6( $range ) { # Expand any IPv6 IP $range = IP::sanitizeIP( $range ); // CIDR notation... if ( strpos( $range, '/' ) !== false ) { list( $network, $bits ) = self::parseCIDR6( $range ); if ( $network === false ) { $start = $end = false; } else { $start = wfBaseConvert( $network, 10, 16, 32, false ); # Turn network to binary (again) $end = wfBaseConvert( $network, 10, 2, 128 ); # Truncate the last (128-$bits) bits and replace them with ones $end = str_pad( substr( $end, 0, $bits ), 128, 1, STR_PAD_RIGHT ); # Convert to hex $end = wfBaseConvert( $end, 2, 16, 32, false ); # see toHex() comment $start = "v6-$start"; $end = "v6-$end"; } // Explicit range notation... } elseif ( strpos( $range, '-' ) !== false ) { list( $start, $end ) = array_map( 'trim', explode( '-', $range, 2 ) ); $start = self::toUnsigned6( $start ); $end = self::toUnsigned6( $end ); if ( $start > $end ) { $start = $end = false; } else { $start = wfBaseConvert( $start, 10, 16, 32, false ); $end = wfBaseConvert( $end, 10, 16, 32, false ); } # see toHex() comment $start = "v6-$start"; $end = "v6-$end"; } 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 String: the address to check against the given range. * @param $range String: the range to check the given address against. * @return Boolean: whether or not the given address is in the given range. */ public static function isInRange( $addr, $range ) { $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 String: something that might be an IP address * @return String: 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 } }