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<?php /** * Functions and constants to play with IP addresses and ranges * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * 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 "<hashar at free dot fr>" / namespace Wikimedia; use InvalidArgumentException; /* * A collection of public static functions to play with IP address * and IP ranges. / class IPUtils { /* * An IPv4 address is made of 4 bytes from x00 to xFF which is d0 to d255 / public const RE_IP_BYTE = '(25[0-5]\|2[0-4][0-9]\|1[0-9][0-9]\|0?[0-9]?[0-9])'; private const RE_IP_ADD = self::RE_IP_BYTE . '\.' . self::RE_IP_BYTE . '\.' . self::RE_IP_BYTE . '\.' . self::RE_IP_BYTE; /* * An IPv4 range is an IP address and a prefix (d0 to d32) / private const RE_IP_PREFIX = '(3[0-2]\|[12][0-9]\|[0-9])'; private const RE_IP_RANGE = '(' . self::RE_IP_ADD . '\/' . self::RE_IP_PREFIX . '\|' . self::RE_IP_ADD . ' ?\- ?' . self::RE_IP_ADD . ')'; /* * An IPv6 address is made up of 8 words (each x0000 to xFFFF). * However, the "::" abbreviation can be used on consecutive x0000 words. / private const RE_IPV6_WORD = '([0-9A-Fa-f]{1,4})'; /* * An IPv6 range is an IP address and a prefix (d0 to d128) / private const RE_IPV6_PREFIX = '(12[0-8]\|1[01][0-9]\|[1-9][0-9]\|[0-9])'; private const RE_IPV6_ADD = '(?:' . // starts with "::" (including "::") ':(?::\|(?::' . self::RE_IPV6_WORD . '){1,7})' . '\|' . // ends with "::" (except "::") self::RE_IPV6_WORD . '(?::' . self::RE_IPV6_WORD . '){0,6}::' . '\|' . // contains one "::" in the middle (the ^ makes the test fail if none found) self::RE_IPV6_WORD . '(?::((?(-1)\|:))?' . self::RE_IPV6_WORD . '){1,6}(?(-2)\|^)' . '\|' . // contains no "::" self::RE_IPV6_WORD . '(?::' . self::RE_IPV6_WORD . '){7}' . ')'; /* * An IPv6 range is an IP address and a prefix (d1 to d128) / private const RE_IPV6_RANGE = '(' . self::RE_IPV6_ADD . '\/' . self::RE_IPV6_PREFIX . '\|' . self::RE_IPV6_ADD . ' ?\- ?' . self::RE_IPV6_ADD . ')'; /* * For IPv6 canonicalization (NOT for strict validation; these are quite lax!) / public const RE_IPV6_GAP = ':(?:0+:)(?::(?:0+:))?'; /* @private / private const RE_IPV6_V4_PREFIX = '0' . self::RE_IPV6_GAP . '(?:ffff:)?'; /** * This might be useful for regexps used elsewhere, matches any IPv4 or IPv6 address or network / private const RE_IP_ADDRESS_STRING = '(?:' . // IPv4 self::RE_IP_ADD . '(?:\/' . self::RE_IP_PREFIX . ')?' . '\|' . // IPv6 self::RE_IPV6_ADD . '(?:\/' . self::RE_IPV6_PREFIX . ')?' . ')'; /* * Maximum number of IP addresses that can be retrieved from a given range. / private const MAXIMUM_IPS_FROM_RANGE = 2 * 16; /** * 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 string $ip Possible IP address * @return bool / public static function isIPAddress( $ip ) { return (bool)preg_match( '/^' . self::RE_IP_ADDRESS_STRING . '$/', $ip ); } /* * Given a string, determine if it as valid IP in IPv6 only. * @note Unlike isValid(), this looks for networks too. * * @param string $ip Possible IP address * @return bool / public static function isIPv6( $ip ) { return (bool)preg_match( '/^' . self::RE_IPV6_ADD . '(?:\/' . self::RE_IPV6_PREFIX . ')?$/', $ip ); } /* * Given a string, determine if it as valid IP in IPv4 only. * @note Unlike isValid(), this looks for networks too. * * @param string $ip Possible IP address * @return bool / public static function isIPv4( $ip ) { return (bool)preg_match( '/^' . self::RE_IP_ADD . '(?:\/' . self::RE_IP_PREFIX . ')?$/', $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 string $ip * @return bool True if it is valid / public static function isValid( $ip ) { // Test IPv4 before IPv6 as it's more common. return self::isValidIPv4( $ip ) \|\| self::isValidIPv6( $ip ); } /* * Validate an IPv4 address. Ranges are NOT considered valid. * * @param string $ip * @return bool True if it is valid / public static function isValidIPv4( $ip ) { return (bool)preg_match( '/^' . self::RE_IP_ADD . '$/', $ip ); } /* * Validate an IPv6 address. Ranges are NOT considered valid. * SIIT IPv4-translated addresses are rejected. * @note canonicalize() tries to convert translated addresses to IPv4. * * @param string $ip * @return bool True if it is valid / public static function isValidIPv6( $ip ) { return (bool)preg_match( '/^' . self::RE_IPV6_ADD . '$/', $ip ); } /* * Validate an IPv4 range (valid IPv4 address with a valid CIDR prefix or explicit range). * * @param string $ipRange * @return bool True if input is valid / private static function isValidIPv4Range( $ipRange ) { return (bool)preg_match( '/^' . self::RE_IP_RANGE . '$/', $ipRange ); } /* * Validate an IPv6 range (valid IPv6 address with a valid CIDR prefix or explicit range). * * @param string $ipRange * @return bool True if input is valid / private static function isValidIPv6Range( $ipRange ) { return (bool)preg_match( '/^' . self::RE_IPV6_RANGE . '$/', $ipRange ); } /* * Validate an IP range (valid in either IPv4 OR IPv6; given with valid CIDR prefix or in explicit notation). * SIIT IPv4-translated addresses are rejected. * @note canonicalize() tries to convert translated addresses to IPv4. * * @param string $ipRange * @return bool True if it is valid / public static function isValidRange( $ipRange ) { // Test IPv4 before IPv6 as it's more common. return self::isValidIPv4Range( $ipRange ) \|\| self::isValidIPv6Range( $ipRange ); } /* * Convert an IP into a verbose, uppercase, normalized form. * Both IPv4 and IPv6 addresses are trimmed. Additionally, * IPv6 addresses in octet notation are expanded to 8 words; * IPv4 addresses have leading zeros, in each octet, removed. * * @param string $ip IP address in quad or octet form (CIDR or not). * @return string\|null / public static function sanitizeIP( $ip ) { $ip = trim( $ip ); if ( $ip === '' ) { return null; } // If not an IP, just return trimmed value, since sanitizeIP() is called // in a number of contexts where usernames are supplied as input. if ( !self::isIPAddress( $ip ) ) { return $ip; } if ( self::isIPv4( $ip ) ) { // Remove leading 0's from octet representation of IPv4 address return preg_replace( '!(?:^\|(?<=\.))0+(?=[1-9]\|0[./]\|0$)!', '', $ip ); } // 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:'; // for the address '::' $extra = $ip == '::' ? '0' : ''; // 7+2 (due to '::') $pad = 9; // If the '::' is at the end... } elseif ( $abbrevPos == $addressEnd - 1 ) { $repeat = ':0'; $extra = ''; // 7+2 (due to '::') $pad = 9; // If the '::' is in the middle... } else { $repeat = ':0'; $extra = ':'; // 6+2 (due to '::') $pad = 8; } $ip = str_replace( '::', str_repeat( $repeat, $pad - substr_count( $ip, ':' ) ) . $extra, $ip ); } // Remove leading zeros from each bloc as needed return preg_replace( '/(^\|:)0+(' . self::RE_IPV6_WORD . ')/', '$1$2', $ip ); } /* * Prettify an IP for display to end users. * This will make it more compact and lower-case. * * @param string $ip * @return string\|null / public static function prettifyIP( $ip ) { // normalize (removes '::') $ip = self::sanitizeIP( $ip ); if ( $ip === null ) { return null; } if ( self::isIPv6( $ip ) ) { // Split IP into an address and a CIDR if ( strpos( $ip, '/' ) !== false ) { list( $ip, $cidr ) = explode( '/', $ip, 2 ); } else { list( $ip, $cidr ) = [ $ip, '' ]; } // Get the largest slice of words with multiple zeros $offset = 0; $longest = $longestPos = false; while ( preg_match( '!(?:^\|:)0(?::0)+(?:$\|:)!', $ip, $m, PREG_OFFSET_CAPTURE, $offset ) ) { // full match list( $match, $pos ) = $m[0]; if ( strlen( (string)$match ) > strlen( (string)$longest ) ) { $longest = $match; $longestPos = $pos; } // advance $offset = $pos + strlen( $match ); } if ( $longest !== false ) { // Replace this portion of the string with the '::' abbreviation $ip = substr_replace( $ip, '::', $longestPos, strlen( $longest ) ); } // Add any CIDR back on if ( $cidr !== '' ) { $ip = "{$ip}/{$cidr}"; } // Convert to lower case to make it more readable $ip = strtolower( $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 string $both The string with the host (or IPv4/IPv6 address) and port * @return array\|false Array normally, false on certain failures / public static function splitHostAndPort( $both ) { if ( substr( $both, 0, 1 ) === '[' ) { if ( preg_match( '/^\[(' . self::RE_IPV6_ADD . ')\](?::(?P<port>\d+))?$/', $both, $m ) ) { if ( isset( $m['port'] ) ) { return [ $m[1], intval( $m['port'] ) ]; } else { return [ $m[1], false ]; } } else { // Square bracket found but no IPv6 return false; } } $numColons = substr_count( $both, ':' ); if ( $numColons >= 2 ) { // Is it a bare IPv6 address? if ( preg_match( '/^' . self::RE_IPV6_ADD . '$/', $both ) ) { return [ $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 [ $bits[0], intval( $bits[1] ) ]; } else { // Not a valid port return false; } } // Plain hostname return [ $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 string $host * @param int $port * @param bool\|int $defaultPort * @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"; } } /* * Convert an IPv4 or IPv6 hexadecimal representation back to readable format * * @param string $hex 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 string $ip_hex 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 return preg_replace( '/(^\|:)0+(' . self::RE_IPV6_WORD . ')/', '$1$2', $ip_oct ); } /** * Converts a hexadecimal number to an IPv4 address in quad-dotted notation * * @param string $ip_hex 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 * * @param string $ip * @return bool / public static function isPublic( $ip ) { static $privateSet = null; if ( !$privateSet ) { $privateSet = new IPSet( [ // RFC 1918 (private) '10.0.0.0/8', // RFC 1918 (private) '172.16.0.0/12', // RFC 1918 (private) '192.168.0.0/16', // this network '0.0.0.0/8', // loopback '127.0.0.0/8', // RFC 4193 (local) 'fc00::/7', // loopback '0:0:0:0:0:0:0:1', // link-local '169.254.0.0/16', // link-local 'fe80::/10', ] ); } return !$privateSet->match( $ip ); } /* * 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 string $ip Quad dotted/octet IP address. * @return string\|bool False on failure / public static function toHex( $ip ) { if ( self::isIPv6( $ip ) ) { $n = 'v6-' . self::IPv6ToRawHex( $ip ); } elseif ( self::isIPv4( $ip ) ) { // T62035/T97897: An IP with leading 0's fails in ip2long sometimes (e.g. .08), // also double/triple 0 needs to be changed to just a single 0 for ip2long. $ip = self::sanitizeIP( $ip ); $n = ip2long( $ip ); if ( $n < 0 ) { // We don't run code coverage on a 32-bit OS or Windows, so this will never be exercised // @codeCoverageIgnoreStart $n += 2 32; // On 32-bit platforms (and on Windows), 2^32 does not fit into an int, // so $n becomes a float. We convert it to string instead. if ( is_float( $n ) ) { $n = (string)$n; } // @codeCoverageIgnoreEnd } if ( $n !== false ) { // Floating points can handle the conversion; faster than \Wikimedia\base_convert() $n = strtoupper( str_pad( base_convert( $n, 10, 16 ), 8, '0', STR_PAD_LEFT ) ); } } else { $n = false; } return $n; } / * Given an IPv6 address in octet notation, returns a pure hex string. * * @param string $ip Octet ipv6 IP address. * @return string\|bool Pure hex (uppercase); false on failure / private static function IPv6ToRawHex( $ip ) { $ip = self::sanitizeIP( $ip ); if ( !$ip ) { return false; } $r_ip = ''; foreach ( explode( ':', $ip ) as $v ) { $r_ip .= str_pad( $v, 4, '0', STR_PAD_LEFT ); } return $r_ip; } /* * Convert a network specification in CIDR notation * to an integer network and a number of bits * * @param string $range IP with CIDR prefix * @return array [int\|string, int] / public static function parseCIDR( $range ) { if ( self::isIPv6( $range ) ) { return self::parseCIDR6( $range ); } $parts = explode( '/', $range, 2 ); if ( count( $parts ) != 2 ) { return [ 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 { $network &= ~( ( 1 << ( 32 - (int)$bits ) ) - 1 ); } // Convert to unsigned if ( $network < 0 ) { $network += 2 * 32; } } else { $network = false; $bits = false; } return [ $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 string $range IP range * @return array{string,string}\|array{false,false} If the start or end of the range * is invalid, then array `[false, false]` is returned / 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 + 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::toHex( $start ); $end = self::toHex( $end ); if ( $start > $end ) { $start = $end = false; } } else { $start = $end = false; } } else { // Single IP $start = $end = self::toHex( $range ); } if ( $start === false \|\| $end === false ) { return [ false, false ]; } else { return [ $start, $end ]; } } /** * Convert a network specification in IPv6 CIDR notation to an * integer network and a number of bits * * @param string $range * * @return array{string,int}\|array{false,false} / private static function parseCIDR6( $range ) { // Explode into <expanded IP,range> $parts = explode( '/', self::sanitizeIP( $range ), 2 ); if ( count( $parts ) != 2 ) { return [ 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 = \Wikimedia\base_convert( $network, 16, 2, 128 ); // Truncate the last (128-$bits) bits and replace them with zeros $network = str_pad( substr( $network, 0, (int)$bits ), 128, '0', STR_PAD_RIGHT ); // Convert back to an integer $network = \Wikimedia\base_convert( $network, 2, 10 ); } } else { $network = false; $bits = false; } return [ $network, (int)$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 string $range * * @return array [string, string]\|array [false, false] If the start or end of the range * is invalid, then array [false, false] is returned / private static function parseRange6( $range ) { // Expand any IPv6 IP $range = self::sanitizeIP( $range ); $start = false; $end = false; // CIDR notation... if ( strpos( $range, '/' ) !== false ) { list( $network, $bits ) = self::parseCIDR6( $range ); if ( $network !== false ) { $start = \Wikimedia\base_convert( $network, 10, 16, 32, false ); // Turn network to binary (again) $end = \Wikimedia\base_convert( $network, 10, 2, 128 ); // Truncate the last (128-$bits) bits and replace them with ones $end = str_pad( substr( $end, 0, $bits ), 128, '1', STR_PAD_RIGHT ); // Convert to hex $end = \Wikimedia\base_convert( $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::toHex( $start ); $end = self::toHex( $end ); if ( $start > $end ) { $start = $end = false; } } if ( $start === false \|\| $end === false ) { return [ false, false ]; } else { return [ $start, $end ]; } } /* * Determine if a given IPv4/IPv6 address is in a given CIDR network * * @param string $addr The address to check against the given range. * @param string $range The range to check the given address against. * @return bool Whether or not the given address is in the given range. * * @note This can return unexpected results for invalid arguments! * Make sure you pass a valid IP address and IP 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; } /* * Determines if an IP address is a list of CIDR a.b.c.d/n ranges. * * @param string $ip the IP to check * @param array $ranges the IP ranges, each element a range * * @return bool true if the specified adress belongs to the specified range; otherwise, false. / public static function isInRanges( $ip, $ranges ) { foreach ( $ranges as $range ) { if ( self::isInRange( $ip, $range ) ) { return true; } } return false; } /* * 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 string $addr Something that might be an IP address * @return string\|null Valid IP address or null / public static function canonicalize( $addr ) { // remove zone info (T37738) $addr = preg_replace( '/\%./', '', $addr ); // If it's already a valid IPv4 address, nothing to do if ( self::isValidIPv4( $addr ) ) { return $addr; } // https://en.wikipedia.org/wiki/IPv6#IPv4-mapped_IPv6_addresses // Turn mapped addresses from: // ::ce:ffff:1.2.3.4 to 1.2.3.4 (IPv4-mapped IPv6 addresses) // ::1.2.3.4 to 1.2.3.4 (IPv4-compatible IPv6 address) // IPv4-compatible IPv6 addresses are now deprecated https://tools.ietf.org/html/rfc4291#section-2.5.5.1 if ( preg_match( '/^' . self::RE_IPV6_V4_PREFIX . '(' . self::RE_IP_ADD . ')$/i', $addr, $m ) ) { return $m[1]; } // Converts :ffff:1F to 255.255.0.31 // Is this actually used/needed? if ( preg_match( '/^' . self::RE_IPV6_V4_PREFIX . self::RE_IPV6_WORD . ':' . self::RE_IPV6_WORD . '$/i', $addr, $m ) ) { return long2ip( ( hexdec( $m[1] ) << 16 ) + hexdec( $m[2] ) ); } // It's a valid IPv6 address that we haven't canonicalized, so return it if ( self::isValidIPv6( $addr ) ) { return $addr; } // Not a valid IP address return null; } /** * Gets rid of unneeded numbers in quad-dotted/octet IP strings * For example, 127.111.113.151/24 -> 127.111.113.0/24 * @param string $range 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 ) { // wasn't actually a range return $start; } return "$start/$bits"; } /* * Returns the subnet of a given IP * * @param string $ip * @return string\|false / public static function getSubnet( $ip ) { $matches = []; $subnet = false; if ( self::isIPv6( $ip ) ) { $parts = self::parseRange( "$ip/64" ); $subnet = $parts[0]; } elseif ( preg_match( '/^' . self::RE_IP_ADD . '$/', $ip, $matches ) ) { // IPv4 $subnet = "{$matches[1]}.{$matches[2]}.{$matches[3]}"; } return $subnet; } /* * Return all the addresses in a given range * * This currently does not support IPv6 ranges and is limited to /16 block (65535 addresses). * * @param string $range IP ranges to get the IPs within * @return string[] Array of addresses in the range * @throws InvalidArgumentException If input uses IPv6 * @throws InvalidArgumentException If input range is too large */ public static function getIPsInRange( $range ): array { // No IPv6 for now. if ( self::isValidIPv6( $range ) \|\| self::isValidIPv6Range( $range ) ) { throw new InvalidArgumentException( 'Cannot retrieve addresses for IPv6 range: ' . $range ); } list( $start, $end ) = self::parseRange( $range ); if ( $start === false \|\| $start === $end ) { throw new InvalidArgumentException( 'Invalid range given: ' . $range ); } if ( hexdec( $end ) - hexdec( $start ) > self::MAXIMUM_IPS_FROM_RANGE ) { throw new InvalidArgumentException( "Range {$range} is too large, it contains more than " . self::MAXIMUM_IPS_FROM_RANGE . ' addresses' ); } $start = ip2long( self::formatHex( $start ) ); $end = ip2long( self::formatHex( $end ) ); return array_map( 'long2ip', range( $start, $end ) ); } }

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