X-Git-Url: http://git.heureux-cyclage.org/?a=blobdiff_plain;f=includes%2FIP.php;h=e3f612142228ac5115dbffab6b1a6f560cc08805;hb=e4ea0fa287e3d4324dca6108f6a852390920dbdd;hp=371945c9004013f6abda47e5e88539454d32c0aa;hpb=0ade783ae2bc1c2e4101367a5f2afe09eca6d447;p=lhc%2Fweb%2Fwiklou.git diff --git a/includes/IP.php b/includes/IP.php index 371945c900..e3f6121422 100644 --- a/includes/IP.php +++ b/includes/IP.php @@ -1,52 +1,348 @@ - * @License GPL v2 or later + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. + * http://www.gnu.org/copyleft/gpl.html + * + * @file + * @author Antoine Musso , 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 { - // Some regex definition to "play" with IP address and IP address blocks + /** + * 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 ); + } - // An IP is made of 4 bytes from x00 to xFF which is d0 to d255 - const RE_BYTE = '(25[0-5]|2[0-4]\d|1?\d{1,2})'; - const RE_ADD = self::RE_BYTE . '\.' . self::RE_BYTE . '\.' . self::RE_BYTE . '\.' . self::RE_BYTE; - // An IP block is an IP address and a prefix (d1 to d32) - const RE_PREFIX = '(3[0-2]|[12]?\d)'; - const RE_BLOCK = self::RE_ADD . '\/' . self::RE_PREFIX; + /** + * 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. - * @return boolean True if it is valid. + * 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( $ip ) { - return preg_match( '/^' . self::RE_ADD . '$/', $ip, $matches) ; + return ( preg_match( '/^' . RE_IP_ADD . '$/', $ip ) + || preg_match( '/^' . RE_IPV6_ADD . '$/', $ip ) ); } /** - * Validate an IP Block. - * @return boolean True if it is valid. + * 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( $ipblock ) { - return ( count(self::toArray($ipblock)) == 1 + 5 ); + 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 a host/port string, like one might find in the host part of a URL + * per RFC 2732, split the hostname part and the port part and return an + * array with an element for each. If there is no port part, the array will + * have false in place of the port. If the string was invalid in some way, + * false is returned. + * + * This was easy with IPv4 and was generally done in an ad-hoc way, but + * with IPv6 it's somewhat more complicated due to the need to parse the + * square brackets and colons. + * + * A bare IPv6 address is accepted despite the lack of square brackets. + * + * @param $both The string with the host and port + * @return array + */ + public static function splitHostAndPort( $both ) { + if ( substr( $both, 0, 1 ) === '[' ) { + if ( preg_match( '/^\[(' . RE_IPV6_ADD . ')\](?::(?P\d+))?$/', $both, $m ) ) { + if ( isset( $m['port'] ) ) { + return array( $m[1], intval( $m['port'] ) ); + } else { + return array( $m[1], false ); + } + } else { + // Square bracket found but no IPv6 + return false; + } + } + $numColons = substr_count( $both, ':' ); + if ( $numColons >= 2 ) { + // Is it a bare IPv6 address? + if ( preg_match( '/^' . RE_IPV6_ADD . '$/', $both ) ) { + return array( $both, false ); + } else { + // Not valid IPv6, but too many colons for anything else + return false; + } + } + if ( $numColons >= 1 ) { + // Host:port? + $bits = explode( ':', $both ); + if ( preg_match( '/^\d+/', $bits[1] ) ) { + return array( $bits[0], intval( $bits[1] ) ); + } else { + // Not a valid port + return false; + } + } + // Plain hostname + return array( $both, false ); + } + + /** + * Given a host name and a port, combine them into host/port string like + * you might find in a URL. If the host contains a colon, wrap it in square + * brackets like in RFC 2732. If the port matches the default port, omit + * the port specification + * + * @param $host string + * @param $port int + * @param $defaultPort bool|int + * @return string + */ + public static function combineHostAndPort( $host, $port, $defaultPort = false ) { + if ( strpos( $host, ':' ) !== false ) { + $host = "[$host]"; + } + if ( $defaultPort !== false && $port == $defaultPort ) { + return $host; + } else { + return "$host:$port"; + } + } + + /** + * 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 */ - function isPublic( $ip ) { - $n = IP::toUnsigned( $ip ); + 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 ) ) { + if ( $ip != long2ip( $n ) ) { return false; } @@ -62,8 +358,8 @@ class IP { } foreach ( $privateRanges as $r ) { - $start = IP::toUnsigned( $r[0] ); - $end = IP::toUnsigned( $r[1] ); + $start = self::toUnsigned( $r[0] ); + $end = self::toUnsigned( $r[1] ); if ( $n >= $start && $n <= $end ) { return false; } @@ -72,47 +368,350 @@ class IP { } /** - * Split out an IP block as an array of 4 bytes and a mask, - * return false if it cant be determined + * Determine if an IPv6 address really is an IP address, and if it is public, + * i.e. not RFC 4193 or similar * - * @parameter $ip string A quad dotted IP address - * @return array + * @param $ip String + * @return Boolean */ - public static function toArray( $ipblock ) { - if(! preg_match( '/^' . self::RE_ADD . '(?:\/(?:'.self::RE_PREFIX.'))?' . '$/', $ipblock, $matches ) ) { - return false; - } else { - return $matches; + private static function isPublic6( $ip ) { + static $privateRanges = false; + if ( !$privateRanges ) { + $privateRanges = array( + array( 'fc00::', '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 hexadecimal representation of an IP address - * Comes from ProxyTools.php - * @param $ip Quad dotted IP address. + * 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 ) { - $n = self::toUnsigned( $ip ); - if ( $n !== false ) { - $n = sprintf( '%08X', $n ); + 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 IP address in dotted-quad notation, returns an unsigned integer. + * 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 Quad dotted IP address. + * + * @param $ip String: quad dotted IP address. + * @return Mixed: string/int/false */ public static function toUnsigned( $ip ) { - $n = ip2long( $ip ); - if ( $n == -1 || $n === false ) { # Return value on error depends on PHP version - $n = false; - } elseif ( $n < 0 ) { - $n += pow( 2, 32 ); + if ( self::isIPv6( $ip ) ) { + $n = self::toUnsigned6( $ip ); + } else { + $n = ip2long( $ip ); + if ( $n < 0 ) { + $n += pow( 2, 32 ); + } } return $n; } + + /** + * @param $ip + * @return String + */ + 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 + * + * @param $range + * + * @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 + * + * @param $range + * + * @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 + } + + /** + * Gets rid of uneeded numbers in quad-dotted/octet IP strings + * For example, 127.111.113.151/24 -> 127.111.113.0/24 + * @param $range String: IP address to normalize + * @return string + */ + public static function sanitizeRange( $range ) { + list( /*...*/, $bits ) = self::parseCIDR( $range ); + list( $start, /*...*/ ) = self::parseRange( $range ); + $start = self::formatHex( $start ); + if ( $bits === false ) { + return $start; // wasn't actually a range + } + return "$start/$bits"; + } } -?>