<?php
-/*
- * @Author "Ashar Voultoiz" <hashar@altern.org>
- * @License GPL v2 or later
+/**
+ * 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 Ashar Voultoiz <hashar at free dot fr>, Aaron Schulz
*/
// Some regex definition to "play" with IP address and IP address blocks
-// An IP 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 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);
-// For IPv6 canonicalization (NOT for strict validation; these are quite lax!)
+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_GAP', ':(?:0+:)*(?::(?:0+:)*)?' );
-define( 'RE_IPV6_V4_PREFIX', '0*' . RE_IPV6_GAP . '(?:ffff:)?' );
-// An IPv6 block is an IP address and a prefix (d1 to d128)
define( 'RE_IPV6_PREFIX', '(12[0-8]|1[01][0-9]|[1-9]?\d)');
-// An IPv6 IP is made up of 8 octets. However abbreviations like "::" can be used.
-// This is lax! Number of octets/double colons validation not done.
define( 'RE_IPV6_ADD',
- '(' .
- ':(:' . RE_IPV6_WORD . '){1,7}' . // IPs that start with ":"
- '|' .
- RE_IPV6_WORD . '(:{1,2}' . RE_IPV6_WORD . '|::$){1,7}' . // IPs that don't start with ":"
+ '(?:' . // 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_IP_ADD . '(?:\/' . RE_IP_PREFIX . ')?' . // IPv4
'|' .
- RE_IPV6_ADD . '(\/' . RE_IPV6_PREFIX . '|)' . // IPv6
+ RE_IPV6_ADD . '(?:\/' . RE_IPV6_PREFIX . ')?' . // IPv6
')'
);
*/
class IP {
/**
- * Given a string, determine if it as valid IP
- * Unlike isValid(), this looks for networks too
- * @param $ip IP address.
- * @return string
+ * 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( $ip ) {
- if ( !$ip ) return false;
- if ( is_array( $ip ) ) {
- throw new MWException( "invalid value passed to " . __METHOD__ );
- }
- // IPv6 IPs with two "::" strings are ambiguous and thus invalid
- return preg_match( '/^' . IP_ADDRESS_STRING . '$/', $ip) && ( substr_count($ip, '::') < 2 );
+ 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( $ip ) {
- if ( !$ip ) return false;
- if( is_array( $ip ) ) {
- throw new MWException( "invalid value passed to " . __METHOD__ );
- }
- $doubleColons = substr_count($ip, '::');
- // IPv6 IPs with two "::" strings are ambiguous and thus invalid
- return preg_match( '/^' . RE_IPV6_ADD . '(\/' . RE_IPV6_PREFIX . '|)$/', $ip)
- && ( $doubleColons == 1 || substr_count($ip,':') == 7 );
+ return (bool)preg_match( '/^' . RE_IPV6_ADD . '(?:\/' . RE_IPV6_PREFIX . ')?$/', $ip );
}
+ /**
+ * Given a string, determine if it as valid IP in IPv4 only.
+ * Note: Unlike isValid(), this looks for networks too.
+ *
+ * @param $ip String: possible IP address
+ * @return Boolean
+ */
public static function isIPv4( $ip ) {
- if ( !$ip ) return false;
- return preg_match( '/^' . RE_IP_ADD . '(\/' . RE_IP_PREFIX . '|)$/', $ip);
+ return (bool)preg_match( '/^' . RE_IP_ADD . '(?:\/' . RE_IP_PREFIX . ')?$/', $ip );
}
/**
- * Given an IP address in dotted-quad notation, returns an IPv6 octet.
- * See http://www.answers.com/topic/ipv4-compatible-address
- * IPs with the first 92 bits as zeros are reserved from IPv6
- * @param $ip quad-dotted IP address.
- * @return string
+ * 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 IPv4toIPv6( $ip ) {
- if ( !$ip ) return null;
- // Convert only if needed
- if ( self::isIPv6( $ip ) ) return $ip;
- // IPv4 CIDRs
- if ( strpos( $ip, '/' ) !== false ) {
- $parts = explode( '/', $ip, 2 );
- if ( count( $parts ) != 2 ) {
- return false;
- }
- $network = self::toUnsigned( $parts[0] );
- if ( $network !== false && is_numeric( $parts[1] ) && $parts[1] >= 0 && $parts[1] <= 32 ) {
- $bits = $parts[1] + 96;
- return self::toOctet( $network ) . "/$bits";
- } else {
- return false;
- }
- }
- return self::toOctet( self::toUnsigned( $ip ) );
+ public static function isValid( $ip ) {
+ return ( preg_match( '/^' . RE_IP_ADD . '$/', $ip )
+ || preg_match( '/^' . RE_IPV6_ADD . '$/', $ip ) );
}
/**
- * Given an IPv6 address in octet notation, returns an unsigned integer.
- * @param $ip octet ipv6 IP address.
- * @return string
+ * 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 toUnsigned6( $ip ) {
- if ( !$ip ) return null;
- $ip = explode(':', self::sanitizeIP( $ip ) );
- $r_ip = '';
- foreach ($ip as $v) {
- $r_ip .= str_pad( $v, 4, 0, STR_PAD_LEFT );
- }
- $r_ip = wfBaseConvert( $r_ip, 16, 10 );
- return $r_ip;
+ public static function isValidBlock( $ipblock ) {
+ return ( preg_match( '/^' . RE_IPV6_BLOCK . '$/', $ipblock )
+ || preg_match( '/^' . RE_IP_BLOCK . '$/', $ipblock ) );
}
/**
- * Given an IPv6 address in octet notation, returns the expanded octet.
- * IPv4 IPs will be trimmed, thats it...
- * @param $ip octet ipv6 IP address.
- * @return string
+ * 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 ( $ip === '' ) return null;
- // Trim and return IPv4 addresses
- if ( self::isIPv4($ip) ) return $ip;
- // Only IPv6 addresses can be expanded
- if ( !self::isIPv6($ip) ) return $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 = ''; $pad = 9; // 7+2 (due to '::')
- // If the '::' is at the end...
- } else if( $abbrevPos == (strlen($ip)-2) ) {
- $repeat = ':0'; $extra = ''; $pad = 9; // 7+2 (due to '::')
+ 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 '::')
+ $repeat = ':0';
+ $extra = ':';
+ $pad = 8; // 6+2 (due to '::')
}
- $ip = str_replace('::', str_repeat($repeat, $pad-substr_count($ip,':')).$extra, $ip);
+ $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 );
+ $ip = preg_replace( '/(^|:)0+(' . RE_IPV6_WORD . ')/', '$1$2', $ip );
return $ip;
}
/**
* Given an unsigned integer, returns an IPv6 address in octet notation
- * @param $ip integer IP address.
- * @return string
+ *
+ * @param $ip_int String: IP address.
+ * @return String
*/
public static function toOctet( $ip_int ) {
- // Convert to padded uppercase hex
- $ip_hex = wfBaseConvert($ip_int, 10, 16, 32, false);
- // Separate into 8 octets
- $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;
+ 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-' ) {
- return self::hexToOctet( $hex );
- } else {
+ if ( substr( $hex, 0, 3 ) == 'v6-' ) { // IPv6
+ return self::hexToOctet( substr( $hex, 3 ) );
+ } else { // IPv4
return self::hexToQuad( $hex );
}
}
-
+
/**
- * Given a hexadecimal number, returns to an IPv6 address in octet notation
- * @param $ip string hex IP
- * @return string
+ * 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 ) {
- // Convert to padded uppercase hex
- $ip_hex = str_pad( strtoupper($ip_hex), 32, '0');
- // Separate into 8 octets
- $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 );
+ 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 octet notation
- * @param $ip string Hex IP
- * @return string
- */
- public static function hexToQuad( $ip ) {
- // Converts a hexadecimal IP to nnn.nnn.nnn.nnn format
+ * 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, $i * 2, 2 ), 16, 10 );
+ $s .= base_convert( substr( $ip_hex, $i * 2, 2 ), 16, 10 );
}
return $s;
}
- /**
- * Convert a network specification in IPv6 CIDR notation to an integer network and a number of bits
- * @return array(string, int)
- */
- public static function parseCIDR6( $range ) {
- # Expand any IPv6 IP
- $parts = explode( '/', IP::sanitizeIP( $range ), 2 );
- if ( count( $parts ) != 2 ) {
- return array( false, false );
- }
- $network = self::toUnsigned6( $parts[0] );
- if ( $network !== false && is_numeric( $parts[1] ) && $parts[1] >= 0 && $parts[1] <= 128 ) {
- $bits = $parts[1];
- if ( $bits == 0 ) {
- $network = 0;
- } else {
- # Native 32 bit functions WONT work here!!!
- # Convert to a padded binary number
- $network = wfBaseConvert( $network, 10, 2, 128 );
- # Truncate the last (128-$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, $bits );
- }
-
- /**
- * Given a string range in a number of formats, return the start and end of
- * the range in hexadecimal. For IPv6.
- *
- * Formats are:
- * 2001:0db8:85a3::7344/96 CIDR
- * 2001:0db8:85a3::7344 - 2001:0db8:85a3::7344 Explicit range
- * 2001:0db8:85a3::7344/96 Single IP
- * @return array(string, int)
- */
- public static function parseRange6( $range ) {
- # Expand any IPv6 IP
- $range = IP::sanitizeIP( $range );
- if ( strpos( $range, '/' ) !== false ) {
- # CIDR
- 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";
- }
- } elseif ( strpos( $range, '-' ) !== false ) {
- # Explicit range
- 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 );
- }
- }
-
- /**
- * Validate an IP address.
- * @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.
- * @return boolean True if it is valid.
- */
- public static function isValidBlock( $ipblock ) {
- return ( count(self::toArray($ipblock)) == 1 + 5 );
- }
-
/**
* 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 ) ) {
+ if ( $ip != long2ip( $n ) ) {
return false;
}
}
/**
- * Split out an IP block as an array of 4 bytes and a mask,
- * return false if it can't be determined
+ * 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 A quad dotted/octet IP address
- * @return array
+ * @param $ip String
+ * @return Boolean
*/
- public static function toArray( $ipblock ) {
- $matches = array();
- if( preg_match( '/^' . RE_IP_ADD . '(?:\/(?:'.RE_IP_PREFIX.'))?' . '$/', $ipblock, $matches ) ) {
- return $matches;
- } else if ( preg_match( '/^' . RE_IPV6_ADD . '(?:\/(?:'.RE_IPV6_PREFIX.'))?' . '$/', $ipblock, $matches ) ) {
- return $matches;
- } else {
- return false;
+ 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.
+ * 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 Quad dotted/octet IP address.
- * @return hexidecimal
+ * @param $ip String: quad dotted/octet IP address.
+ * @return String
*/
public static function toHex( $ip ) {
- $n = self::toUnsigned( $ip );
- if ( $n !== false ) {
- $n = self::isIPv6($ip) ? "v6-" . wfBaseConvert( $n, 10, 16, 32, false ) : wfBaseConvert( $n, 10, 16, 8, false );
+ if ( self::isIPv6( $ip ) ) {
+ $n = 'v6-' . self::IPv6ToRawHex( $ip );
+ } else {
+ $n = self::toUnsigned( $ip );
+ if ( $n !== false ) {
+ $n = wfBaseConvert( $n, 10, 16, 8, false );
+ }
}
return $n;
}
+ /**
+ * Given an IPv6 address in octet notation, returns a pure hex string.
+ *
+ * @param $ip String: octet ipv6 IP address.
+ * @return String: pure hex (uppercase)
+ */
+ private static function IPv6ToRawHex( $ip ) {
+ $ip = self::sanitizeIP( $ip );
+ if ( !$ip ) {
+ return null;
+ }
+ $r_ip = '';
+ foreach ( explode( ':', $ip ) as $v ) {
+ $r_ip .= str_pad( $v, 4, 0, STR_PAD_LEFT );
+ }
+ return $r_ip;
+ }
+
/**
* Given an IP address in dotted-quad/octet notation, returns an unsigned integer.
* Like ip2long() except that it actually works and has a consistent error return value.
* Comes from ProxyTools.php
- * @param $ip Quad dotted IP address.
- * @return integer
+ *
+ * @param $ip String: quad dotted IP address.
+ * @return Mixed: string/int/false
*/
public static function toUnsigned( $ip ) {
- // Use IPv6 functions if needed
if ( self::isIPv6( $ip ) ) {
- return self::toUnsigned6( $ip );
- }
- if ( $ip == '255.255.255.255' ) {
- $n = -1;
+ $n = self::toUnsigned6( $ip );
} else {
$n = ip2long( $ip );
- if ( $n == -1 || $n === false ) { # Return value on error depends on PHP version
- $n = false;
+ if ( $n < 0 ) {
+ $n += pow( 2, 32 );
}
}
- if ( $n < 0 ) {
- $n += pow( 2, 32 );
- }
return $n;
}
- /**
- * Convert a dotted-quad IP to a signed integer
- * Returns false on failure
- */
- public static function toSigned( $ip ) {
- if ( $ip == '255.255.255.255' ) {
- $n = -1;
- } else {
- $n = ip2long( $ip );
- if ( $n == -1 ) {
- $n = false;
- }
- }
- return $n;
+ private static function toUnsigned6( $ip ) {
+ return wfBaseConvert( self::IPv6ToRawHex( $ip ), 16, 10 );
}
/**
- * Convert a network specification in CIDR notation to an integer network and a number of bits
- * @return array(string, int)
+ * 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 );
}
- $network = self::toSigned( $parts[0] );
- if ( $network !== false && is_numeric( $parts[1] ) && $parts[1] >= 0 && $parts[1] <= 32 ) {
- $bits = $parts[1];
+ 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);
+ $network &= ~( ( 1 << ( 32 - $bits ) ) - 1);
}
# Convert to unsigned
if ( $network < 0 ) {
}
/**
- * Given a string range in a number of formats, return the start and end of
- * the range in hexadecimal.
+ * 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
* 2001:0db8:85a3::7344/96 CIDR
* 2001:0db8:85a3::7344 - 2001:0db8:85a3::7344 Explicit range
* 2001:0db8:85a3::7344 Single IP
- * @return array(string, int)
+ * @param $range String: IP range
+ * @return array(string, string)
*/
public static function parseRange( $range ) {
- // Use IPv6 functions if needed
- if ( self::isIPv6( $range ) ) {
- return self::parseRange6( $range );
- }
+ // CIDR notation
if ( strpos( $range, '/' ) !== false ) {
- # CIDR
+ 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 );
+ $end = sprintf( '%08X', $network + pow( 2, ( 32 - $bits ) ) - 1 );
}
+ // Explicit range
} elseif ( strpos( $range, '-' ) !== false ) {
- # Explicit range
list( $start, $end ) = array_map( 'trim', explode( '-', $range, 2 ) );
- if( self::isIPAddress( $start ) && self::isIPAddress( $end ) ) {
- $start = self::toUnsigned( $start ); $end = self::toUnsigned( $end );
+ 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 {
}
}
+ /**
+ * Convert a network specification in IPv6 CIDR notation to an
+ * integer network and a number of bits
+ *
+ * @return array(string, int)
+ */
+ private static function parseCIDR6( $range ) {
+ # Explode into <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
+ * @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 The address to check against the given range.
- * @param $range The range to check the given address against.
- * @return bool Whether or not the given address is in the given range.
+ *
+ * @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 ) {
- // Convert to IPv6 if needed
$hexIP = self::toHex( $addr );
list( $start, $end ) = self::parseRange( $range );
- return (strcmp($hexIP, $start) >= 0 &&
- strcmp($hexIP, $end) <= 0);
+ return ( strcmp( $hexIP, $start ) >= 0 &&
+ strcmp( $hexIP, $end ) <= 0 );
}
/**
* This currently only checks a few IPV4-to-IPv6 related cases. More
* unusual representations may be added later.
*
- * @param $addr something that might be an IP address
- * @return valid dotted quad IPv4 address or null
+ * @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 ) )
+ 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;
+ 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, $m ) )
- return '127.0.0.1';
-
+ if ( preg_match( '/^0*' . RE_IPV6_GAP . '1$/', $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, $m ) )
+ if ( preg_match( '/^' . RE_IPV6_V4_PREFIX . '(' . RE_IP_ADD . ')$/i', $addr, $m ) ) {
return $m[1];
- if ( preg_match( '/^' . RE_IPV6_V4_PREFIX . RE_IPV6_WORD . ':' . RE_IPV6_WORD . '$/i', $addr, $m ) )
+ }
+ if ( preg_match( '/^' . RE_IPV6_V4_PREFIX . RE_IPV6_WORD .
+ ':' . RE_IPV6_WORD . '$/i', $addr, $m ) )
+ {
return long2ip( ( hexdec( $m[1] ) << 16 ) + hexdec( $m[2] ) );
+ }
return null; // give up
}
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