b715f432f4
It's unreasonable to expect newbies to know that "bug 12345" means "Task T14345" except where it doesn't, so let's just standardise on the real numbers. Skipping jsminplus.php as those bug numbers aren't Wikimedia's, nor obviously someone else's. Change-Id: I9a2210e17852ee56f11282b980ac66d8c7a95671
744 lines
22 KiB
PHP
744 lines
22 KiB
PHP
<?php
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/**
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* Functions and constants to play with IP addresses and ranges
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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* http://www.gnu.org/copyleft/gpl.html
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*
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* @file
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* @author Antoine Musso "<hashar at free dot fr>", Aaron Schulz
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*/
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use IPSet\IPSet;
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// Some regex definition to "play" with IP address and IP address blocks
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// An IPv4 address 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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// An IPv6 address is made up of 8 words (each x0000 to xFFFF).
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// However, the "::" abbreviation can be used on consecutive x0000 words.
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define( 'RE_IPV6_WORD', '([0-9A-Fa-f]{1,4})' );
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define( 'RE_IPV6_PREFIX', '(12[0-8]|1[01][0-9]|[1-9]?\d)' );
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define( 'RE_IPV6_ADD',
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'(?:' . // starts with "::" (including "::")
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':(?::|(?::' . RE_IPV6_WORD . '){1,7})' .
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'|' . // ends with "::" (except "::")
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RE_IPV6_WORD . '(?::' . RE_IPV6_WORD . '){0,6}::' .
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'|' . // contains one "::" in the middle (the ^ makes the test fail if none found)
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RE_IPV6_WORD . '(?::((?(-1)|:))?' . RE_IPV6_WORD . '){1,6}(?(-2)|^)' .
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'|' . // contains no "::"
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RE_IPV6_WORD . '(?::' . RE_IPV6_WORD . '){7}' .
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')'
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);
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// An IPv6 block is an IP address and a prefix (d1 to d128)
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define( 'RE_IPV6_BLOCK', RE_IPV6_ADD . '\/' . RE_IPV6_PREFIX );
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// For IPv6 canonicalization (NOT for strict validation; these are quite lax!)
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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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// This might be useful for regexps used elsewhere, matches any IPv4 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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/** @var IPSet */
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private static $proxyIpSet = null;
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/**
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* Determine if a string is as valid IP address or network (CIDR prefix).
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* SIIT IPv4-translated addresses are rejected.
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* @note canonicalize() tries to convert translated addresses to IPv4.
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*
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* @param string $ip Possible IP address
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* @return bool
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*/
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public static function isIPAddress( $ip ) {
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return (bool)preg_match( '/^' . IP_ADDRESS_STRING . '$/', $ip );
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}
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/**
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* Given a string, determine if it as valid IP in IPv6 only.
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* @note Unlike isValid(), this looks for networks too.
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*
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* @param string $ip Possible IP address
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* @return bool
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*/
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public static function isIPv6( $ip ) {
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return (bool)preg_match( '/^' . RE_IPV6_ADD . '(?:\/' . RE_IPV6_PREFIX . ')?$/', $ip );
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}
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/**
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* Given a string, determine if it as valid IP in IPv4 only.
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* @note Unlike isValid(), this looks for networks too.
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*
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* @param string $ip Possible IP address
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* @return bool
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*/
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public static function isIPv4( $ip ) {
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return (bool)preg_match( '/^' . RE_IP_ADD . '(?:\/' . RE_IP_PREFIX . ')?$/', $ip );
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}
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/**
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* Validate an IP address. Ranges are NOT considered valid.
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* SIIT IPv4-translated addresses are rejected.
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* @note canonicalize() tries to convert translated addresses to IPv4.
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*
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* @param string $ip
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* @return bool True if it is valid
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*/
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public static function isValid( $ip ) {
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return ( preg_match( '/^' . RE_IP_ADD . '$/', $ip )
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|| preg_match( '/^' . RE_IPV6_ADD . '$/', $ip ) );
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}
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/**
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* Validate an IP Block (valid address WITH a valid prefix).
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* SIIT IPv4-translated addresses are rejected.
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* @note canonicalize() tries to convert translated addresses to IPv4.
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*
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* @param string $ipblock
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* @return bool True if it is valid
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*/
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public static function isValidBlock( $ipblock ) {
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return ( preg_match( '/^' . RE_IPV6_BLOCK . '$/', $ipblock )
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|| preg_match( '/^' . RE_IP_BLOCK . '$/', $ipblock ) );
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}
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/**
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* Convert an IP into a verbose, uppercase, normalized form.
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* Both IPv4 and IPv6 addresses are trimmed. Additionally,
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* IPv6 addresses in octet notation are expanded to 8 words;
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* IPv4 addresses have leading zeros, in each octet, removed.
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*
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* @param string $ip IP address in quad or octet form (CIDR or not).
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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 === '' ) {
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return null;
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}
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/* If not an IP, just return trimmed value, since sanitizeIP() is called
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* in a number of contexts where usernames are supplied as input.
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*/
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if ( !self::isIPAddress( $ip ) ) {
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return $ip;
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}
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if ( self::isIPv4( $ip ) ) {
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// Remove leading 0's from octet representation of IPv4 address
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$ip = preg_replace( '/(?:^|(?<=\.))0+(?=[1-9]|0\.|0$)/', '', $ip );
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return $ip;
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}
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// Remove any whitespaces, convert to upper case
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$ip = strtoupper( $ip );
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// Expand zero abbreviations
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$abbrevPos = strpos( $ip, '::' );
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if ( $abbrevPos !== false ) {
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// We know this is valid IPv6. Find the last index of the
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// address before any CIDR number (e.g. "a:b:c::/24").
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$CIDRStart = strpos( $ip, "/" );
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$addressEnd = ( $CIDRStart !== false )
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? $CIDRStart - 1
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: strlen( $ip ) - 1;
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// If the '::' is at the beginning...
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if ( $abbrevPos == 0 ) {
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$repeat = '0:';
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$extra = ( $ip == '::' ) ? '0' : ''; // for the address '::'
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$pad = 9; // 7+2 (due to '::')
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// If the '::' is at the end...
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} elseif ( $abbrevPos == ( $addressEnd - 1 ) ) {
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$repeat = ':0';
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$extra = '';
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$pad = 9; // 7+2 (due to '::')
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// If the '::' is in the middle...
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} else {
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$repeat = ':0';
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$extra = ':';
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$pad = 8; // 6+2 (due to '::')
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}
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$ip = str_replace( '::',
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str_repeat( $repeat, $pad - substr_count( $ip, ':' ) ) . $extra,
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$ip
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);
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}
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// Remove leading zeros 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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* Prettify an IP for display to end users.
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* This will make it more compact and lower-case.
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*
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* @param string $ip
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* @return string
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*/
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public static function prettifyIP( $ip ) {
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$ip = self::sanitizeIP( $ip ); // normalize (removes '::')
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if ( self::isIPv6( $ip ) ) {
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// Split IP into an address and a CIDR
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if ( strpos( $ip, '/' ) !== false ) {
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list( $ip, $cidr ) = explode( '/', $ip, 2 );
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} else {
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list( $ip, $cidr ) = [ $ip, '' ];
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}
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// Get the largest slice of words with multiple zeros
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$offset = 0;
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$longest = $longestPos = false;
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while ( preg_match(
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'!(?:^|:)0(?::0)+(?:$|:)!', $ip, $m, PREG_OFFSET_CAPTURE, $offset
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) ) {
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list( $match, $pos ) = $m[0]; // full match
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if ( strlen( $match ) > strlen( $longest ) ) {
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$longest = $match;
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$longestPos = $pos;
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}
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$offset = ( $pos + strlen( $match ) ); // advance
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}
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if ( $longest !== false ) {
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// Replace this portion of the string with the '::' abbreviation
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$ip = substr_replace( $ip, '::', $longestPos, strlen( $longest ) );
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}
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// Add any CIDR back on
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if ( $cidr !== '' ) {
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$ip = "{$ip}/{$cidr}";
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}
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// Convert to lower case to make it more readable
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$ip = strtolower( $ip );
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}
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return $ip;
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}
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/**
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* Given a host/port string, like one might find in the host part of a URL
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* per RFC 2732, split the hostname part and the port part and return an
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* array with an element for each. If there is no port part, the array will
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* have false in place of the port. If the string was invalid in some way,
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* false is returned.
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*
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* This was easy with IPv4 and was generally done in an ad-hoc way, but
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* with IPv6 it's somewhat more complicated due to the need to parse the
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* square brackets and colons.
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*
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* A bare IPv6 address is accepted despite the lack of square brackets.
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*
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* @param string $both The string with the host and port
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* @return array|false Array normally, false on certain failures
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*/
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public static function splitHostAndPort( $both ) {
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if ( substr( $both, 0, 1 ) === '[' ) {
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if ( preg_match( '/^\[(' . RE_IPV6_ADD . ')\](?::(?P<port>\d+))?$/', $both, $m ) ) {
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if ( isset( $m['port'] ) ) {
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return [ $m[1], intval( $m['port'] ) ];
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} else {
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return [ $m[1], false ];
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}
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} else {
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// Square bracket found but no IPv6
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return false;
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}
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}
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$numColons = substr_count( $both, ':' );
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if ( $numColons >= 2 ) {
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// Is it a bare IPv6 address?
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if ( preg_match( '/^' . RE_IPV6_ADD . '$/', $both ) ) {
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return [ $both, false ];
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} else {
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// Not valid IPv6, but too many colons for anything else
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return false;
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}
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}
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if ( $numColons >= 1 ) {
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// Host:port?
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$bits = explode( ':', $both );
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if ( preg_match( '/^\d+/', $bits[1] ) ) {
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return [ $bits[0], intval( $bits[1] ) ];
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} else {
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// Not a valid port
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return false;
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}
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}
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// Plain hostname
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return [ $both, false ];
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}
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/**
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* Given a host name and a port, combine them into host/port string like
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* you might find in a URL. If the host contains a colon, wrap it in square
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* brackets like in RFC 2732. If the port matches the default port, omit
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* the port specification
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*
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* @param string $host
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* @param int $port
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* @param bool|int $defaultPort
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* @return string
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*/
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public static function combineHostAndPort( $host, $port, $defaultPort = false ) {
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if ( strpos( $host, ':' ) !== false ) {
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$host = "[$host]";
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}
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if ( $defaultPort !== false && $port == $defaultPort ) {
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return $host;
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} else {
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return "$host:$port";
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}
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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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* @param string $hex Number, with "v6-" prefix if it is IPv6
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* @return string Quad-dotted (IPv4) or octet notation (IPv6)
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*/
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public static function formatHex( $hex ) {
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if ( substr( $hex, 0, 3 ) == 'v6-' ) { // IPv6
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return self::hexToOctet( substr( $hex, 3 ) );
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} else { // IPv4
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return self::hexToQuad( $hex );
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}
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}
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/**
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* Converts a hexadecimal number to an IPv6 address in octet notation
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*
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* @param string $ip_hex Pure hex (no v6- prefix)
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* @return string (of format a:b:c:d:e:f:g:h)
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*/
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public static function hexToOctet( $ip_hex ) {
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// Pad hex to 32 chars (128 bits)
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$ip_hex = str_pad( strtoupper( $ip_hex ), 32, '0', STR_PAD_LEFT );
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// Separate into 8 words
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$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 quad-dotted notation
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*
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* @param string $ip_hex Pure hex
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* @return string (of format a.b.c.d)
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*/
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public static function hexToQuad( $ip_hex ) {
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// Pad hex to 8 chars (32 bits)
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$ip_hex = str_pad( strtoupper( $ip_hex ), 8, '0', STR_PAD_LEFT );
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// Separate into four quads
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$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_hex, $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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* 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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*
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* @param string $ip
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* @return bool
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*/
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public static function isPublic( $ip ) {
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static $privateSet = null;
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if ( !$privateSet ) {
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$privateSet = new IPSet( [
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'10.0.0.0/8', # RFC 1918 (private)
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'172.16.0.0/12', # RFC 1918 (private)
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'192.168.0.0/16', # RFC 1918 (private)
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'0.0.0.0/8', # this network
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'127.0.0.0/8', # loopback
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'fc00::/7', # RFC 4193 (local)
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'0:0:0:0:0:0:0:1', # loopback
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'169.254.0.0/16', # link-local
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'fe80::/10', # link-local
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] );
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}
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return !$privateSet->match( $ip );
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}
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/**
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* Return a zero-padded upper case 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 string $ip Quad dotted/octet IP address.
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* @return string|bool False on failure
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*/
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public static function toHex( $ip ) {
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if ( self::isIPv6( $ip ) ) {
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$n = 'v6-' . self::IPv6ToRawHex( $ip );
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} elseif ( self::isIPv4( $ip ) ) {
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// T62035/T97897: An IP with leading 0's fails in ip2long sometimes (e.g. *.08),
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// also double/triple 0 needs to be changed to just a single 0 for ip2long.
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$ip = self::sanitizeIP( $ip );
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$n = ip2long( $ip );
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if ( $n < 0 ) {
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$n += pow( 2, 32 );
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# On 32-bit platforms (and on Windows), 2^32 does not fit into an int,
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# so $n becomes a float. We convert it to string instead.
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if ( is_float( $n ) ) {
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$n = (string)$n;
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}
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}
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if ( $n !== false ) {
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# Floating points can handle the conversion; faster than Wikimedia\base_convert()
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$n = strtoupper( str_pad( base_convert( $n, 10, 16 ), 8, '0', STR_PAD_LEFT ) );
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}
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} else {
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$n = 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 IPv6 address in octet notation, returns a pure hex string.
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*
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* @param string $ip Octet ipv6 IP address.
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* @return string|bool Pure hex (uppercase); false on failure
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*/
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private static function IPv6ToRawHex( $ip ) {
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$ip = self::sanitizeIP( $ip );
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if ( !$ip ) {
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return false;
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}
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$r_ip = '';
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foreach ( explode( ':', $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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return $r_ip;
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}
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/**
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* Convert a network specification in CIDR notation
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* to an integer network and a number of bits
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*
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* @param string $range IP with CIDR prefix
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* @return array(int or string, int)
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*/
|
|
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 - $bits ) ) - 1 );
|
|
}
|
|
# Convert to unsigned
|
|
if ( $network < 0 ) {
|
|
$network += pow( 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)
|
|
*/
|
|
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::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)
|
|
*/
|
|
private static function parseCIDR6( $range ) {
|
|
# Explode into <expanded IP,range>
|
|
$parts = explode( '/', IP::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, $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)
|
|
*/
|
|
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 = 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;
|
|
}
|
|
} else {
|
|
# Single IP
|
|
$start = $end = self::toHex( $range );
|
|
}
|
|
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.
|
|
*
|
|
* @since 1.25
|
|
*
|
|
* @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 dotted quad IPv4 address or null
|
|
*/
|
|
public static function canonicalize( $addr ) {
|
|
// remove zone info (T37738)
|
|
$addr = preg_replace( '/\%.*/', '', $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
|
|
$m = [];
|
|
if ( preg_match( '/^0*' . RE_IPV6_GAP . '1$/', $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 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 ) {
|
|
return $start; // wasn't actually a range
|
|
}
|
|
|
|
return "$start/$bits";
|
|
}
|
|
|
|
/**
|
|
* Returns the subnet of a given IP
|
|
*
|
|
* @param string $ip
|
|
* @return string|false
|
|
*/
|
|
public static function getSubnet( $ip ) {
|
|
$matches = [];
|
|
$subnet = false;
|
|
if ( IP::isIPv6( $ip ) ) {
|
|
$parts = IP::parseRange( "$ip/64" );
|
|
$subnet = $parts[0];
|
|
} elseif ( preg_match( '/^(\d+\.\d+\.\d+)\.\d+$/', $ip, $matches ) ) {
|
|
// IPv4
|
|
$subnet = $matches[1];
|
|
}
|
|
return $subnet;
|
|
}
|
|
}
|