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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>", 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<abn>:(?P<iabn>))?' . RE_IPV6_WORD . '(?!:(?P=abn))){1,5}' .
':' . RE_IPV6_WORD . '(?P=iabn)' .
// NOTE: (?!(?P=abn)) fails iff "::" used twice; (?P=iabn) passes iff a "::" was found.
'|' . // contains no "::"
RE_IPV6_WORD . '(?::' . RE_IPV6_WORD . '){7}' .
')'
// NOTE: With PCRE 7.2+, we can combine the two '"::" in the middle' cases into:
// RE_IPV6_WORD . '(?::((?(-1)|:))?' . RE_IPV6_WORD . '){1,6}(?(-2)|^)'
// This also improves regex concatenation by using relative references.
);
// An IPv6 block is an IP address and a prefix (d1 to d128)
define( 'RE_IPV6_BLOCK', RE_IPV6_ADD . '\/' . RE_IPV6_PREFIX );
// For IPv6 canonicalization (NOT for strict validation; these are quite lax!)
define( 'RE_IPV6_GAP', ':(?:0+:)*(?::(?:0+:)*)?' );
define( 'RE_IPV6_V4_PREFIX', '0*' . RE_IPV6_GAP . '(?:ffff:)?' );
// This might be useful for regexps used elsewhere, matches any IPv6 or IPv6 address or network
define( 'IP_ADDRESS_STRING',
'(?:' .
RE_IP_ADD . '(?:\/' . RE_IP_PREFIX . ')?' . // IPv4
'|' .
RE_IPV6_ADD . '(?:\/' . RE_IPV6_PREFIX . ')?' . // IPv6
')'
);
/**
* A collection of public static functions to play with IP address
* and IP blocks.
*/
class IP {
/**
* Determine if a string is as valid IP address or network (CIDR prefix).
* SIIT IPv4-translated addresses are rejected.
* Note: canonicalize() tries to convert translated addresses to IPv4.
*
* @param string $ip 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 string $ip possible IP address
* @return Boolean
*/
public static function isIPv6( $ip ) {
return (bool)preg_match( '/^' . RE_IPV6_ADD . '(?:\/' . RE_IPV6_PREFIX . ')?$/', $ip );
}
/**
* Given a string, determine if it as valid IP in IPv4 only.
* Note: Unlike isValid(), this looks for networks too.
*
* @param string $ip possible IP address
* @return Boolean
*/
public static function isIPv4( $ip ) {
return (bool)preg_match( '/^' . RE_IP_ADD . '(?:\/' . RE_IP_PREFIX . ')?$/', $ip );
}
/**
* Validate an IP address. Ranges are NOT considered valid.
* SIIT IPv4-translated addresses are rejected.
* Note: canonicalize() tries to convert translated addresses to IPv4.
*
* @param $ip String
* @return Boolean: True if it is valid.
*/
public static function isValid( $ip ) {
return ( preg_match( '/^' . RE_IP_ADD . '$/', $ip )
|| preg_match( '/^' . RE_IPV6_ADD . '$/', $ip ) );
}
/**
* Validate an IP Block (valid address WITH a valid prefix).
* SIIT IPv4-translated addresses are rejected.
* Note: canonicalize() tries to convert translated addresses to IPv4.
*
* @param $ipblock String
* @return Boolean: True if it is valid.
*/
public static function isValidBlock( $ipblock ) {
return ( preg_match( '/^' . RE_IPV6_BLOCK . '$/', $ipblock )
|| preg_match( '/^' . RE_IP_BLOCK . '$/', $ipblock ) );
}
/**
* Convert an IP into a verbose, uppercase, normalized form.
* IPv6 addresses in octet notation are expanded to 8 words.
* IPv4 addresses are just trimmed.
*
* @param string $ip 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 zeros from each bloc as needed
$ip = preg_replace( '/(^|:)0+(' . RE_IPV6_WORD . ')/', '$1$2', $ip );
return $ip;
}
/**
* Prettify an IP for display to end users.
* This will make it more compact and lower-case.
*
* @param $ip string
* @return string
*/
public static function prettifyIP( $ip ) {
$ip = self::sanitizeIP( $ip ); // normalize (removes '::')
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 ) = array( $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
) ) {
list( $match, $pos ) = $m[0]; // full match
if ( strlen( $match ) > strlen( $longest ) ) {
$longest = $match;
$longestPos = $pos;
}
$offset += ( $pos + strlen( $match ) ); // advance
}
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 and port
* @return array
*/
public static function splitHostAndPort( $both ) {
if ( substr( $both, 0, 1 ) === '[' ) {
if ( preg_match( '/^\[(' . RE_IPV6_ADD . ')\](?::(?P<port>\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 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 $ip_hex String: pure hex (no v6- prefix)
* @return String (of format a:b:c:d:e:f:g:h)
*/
public static function hexToOctet( $ip_hex ) {
// Pad hex to 32 chars (128 bits)
$ip_hex = str_pad( strtoupper( $ip_hex ), 32, '0', STR_PAD_LEFT );
// Separate into 8 words
$ip_oct = substr( $ip_hex, 0, 4 );
for ( $n = 1; $n < 8; $n++ ) {
$ip_oct .= ':' . substr( $ip_hex, 4 * $n, 4 );
}
// NO leading zeroes
$ip_oct = preg_replace( '/(^|:)0+(' . RE_IPV6_WORD . ')/', '$1$2', $ip_oct );
return $ip_oct;
}
/**
* Converts a hexadecimal number to an IPv4 address in quad-dotted notation
*
* @param $ip_hex String: pure hex
* @return String (of format a.b.c.d)
*/
public static function hexToQuad( $ip_hex ) {
// Pad hex to 8 chars (32 bits)
$ip_hex = str_pad( strtoupper( $ip_hex ), 8, '0', STR_PAD_LEFT );
// Separate into four quads
$s = '';
for ( $i = 0; $i < 4; $i++ ) {
if ( $s !== '' ) {
$s .= '.';
}
$s .= base_convert( substr( $ip_hex, $i * 2, 2 ), 16, 10 );
}
return $s;
}
/**
* Determine if an IP address really is an IP address, and if it is public,
* i.e. not RFC 1918 or similar
* Comes from ProxyTools.php
*
* @param $ip String
* @return Boolean
*/
public static function isPublic( $ip ) {
if ( self::isIPv6( $ip ) ) {
return self::isPublic6( $ip );
}
$n = self::toUnsigned( $ip );
if ( !$n ) {
return false;
}
// ip2long accepts incomplete addresses, as well as some addresses
// followed by garbage characters. Check that it's really valid.
if ( $ip != long2ip( $n ) ) {
return false;
}
static $privateRanges = false;
if ( !$privateRanges ) {
$privateRanges = array(
array( '10.0.0.0', '10.255.255.255' ), # RFC 1918 (private)
array( '172.16.0.0', '172.31.255.255' ), # "
array( '192.168.0.0', '192.168.255.255' ), # "
array( '0.0.0.0', '0.255.255.255' ), # this network
array( '127.0.0.0', '127.255.255.255' ), # loopback
);
}
foreach ( $privateRanges as $r ) {
$start = self::toUnsigned( $r[0] );
$end = self::toUnsigned( $r[1] );
if ( $n >= $start && $n <= $end ) {
return false;
}
}
return true;
}
/**
* Determine if an IPv6 address really is an IP address, and if it is public,
* i.e. not RFC 4193 or similar
*
* @param $ip String
* @return Boolean
*/
private static function isPublic6( $ip ) {
static $privateRanges = false;
if ( !$privateRanges ) {
$privateRanges = array(
array( '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 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
*/
public static function toHex( $ip ) {
if ( self::isIPv6( $ip ) ) {
$n = 'v6-' . self::IPv6ToRawHex( $ip );
} else {
$n = self::toUnsigned( $ip );
if ( $n !== false ) {
$n = wfBaseConvert( $n, 10, 16, 8, false );
}
}
return $n;
}
/**
* Given an IPv6 address in octet notation, returns a pure hex string.
*
* @param string $ip 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 string $ip quad dotted IP address.
* @return Mixed: string/int/false
*/
public static function toUnsigned( $ip ) {
if ( self::isIPv6( $ip ) ) {
$n = self::toUnsigned6( $ip );
} else {
$n = ip2long( $ip );
if ( $n < 0 ) {
$n += pow( 2, 32 );
}
}
return $n;
}
/**
* @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 string $range 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 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::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 <expanded IP,range>
$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 string $addr the address to check against the given range.
* @param string $range 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 string $addr something that might be an IP address
* @return String: valid dotted quad IPv4 address or null
*/
public static function canonicalize( $addr ) {
// remove zone info (bug 35738)
$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
$m = array();
if ( preg_match( '/^0*' . RE_IPV6_GAP . '1$/', $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 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";
}
}