<?php
/*
- * Collection of public static functions to play with IP address
- * and IP blocks.
- *
* @Author "Ashar Voultoiz" <hashar@altern.org>
* @License GPL v2 or later
*/
// 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]\d|1?\d{1,2})');
+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 IP block is an IP address and a prefix (d1 to d32)
-define( 'RE_IP_PREFIX' , '(3[0-2]|[12]?\d)');
+// 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_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 ":"
+ ')'
+);
+define( 'RE_IPV6_BLOCK', RE_IPV6_ADD . '\/' . RE_IPV6_PREFIX );
+// 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 {
+ /**
+ * Given a string, determine if it as valid IP
+ * Unlike isValid(), this looks for networks too
+ * @param $ip IP address.
+ * @return string
+ */
+ 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 );
+ }
+
+ 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 );
+ }
+
+ public static function isIPv4( $ip ) {
+ if ( !$ip ) return false;
+ return 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
+ */
+ 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 ) );
+ }
+
+ /**
+ * Given an IPv6 address in octet notation, returns an unsigned integer.
+ * @param $ip octet ipv6 IP address.
+ * @return string
+ */
+ 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;
+ }
+
+ /**
+ * 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
+ */
+ 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;
+ // Remove any whitespaces, convert to upper case
+ $ip = strtoupper( $ip );
+ // Expand zero abbreviations
+ $abbrevPos = strpos( $ip, '::' );
+ if ( $abbrevPos !== false ) {
+ // 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 the '::' is at the end...
+ } else {
+ $repeat = ':0'; $extra = ':'; $pad = 8; // 6+2 (due to '::')
+ }
+ $ip = str_replace('::', str_repeat($repeat, $pad-substr_count($ip,':')).$extra, $ip);
+ }
+ // Remove leading zereos from each bloc as needed
+ $ip = preg_replace( '/(^|:)0+' . RE_IPV6_WORD . '/', '$1$2', $ip );
+ return $ip;
+ }
+
+ /**
+ * Given an unsigned integer, returns an IPv6 address in octet notation
+ * @param $ip_int integer 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;
+ }
+
+ /**
+ * Convert an IPv4 or IPv6 hexadecimal representation back to readable format
+ */
+ public static function formatHex( $hex ) {
+ if ( substr( $hex, 0, 3 ) == 'v6-' ) {
+ return self::hexToOctet( $hex );
+ } else {
+ return self::hexToQuad( $hex );
+ }
+ }
+
+ /**
+ * Given a hexadecimal number, returns to an IPv6 address in octet notation
+ * @param $ip_hex string hex IP
+ * @return string
+ */
+ 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 );
+ 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
+ $s = '';
+ for ( $i = 0; $i < 4; $i++ ) {
+ if ( $s !== '' ) {
+ $s .= '.';
+ }
+ $s .= base_convert( substr( $ip, $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, $matches) ;
+ return ( preg_match( '/^' . RE_IP_ADD . '$/', $ip) || preg_match( '/^' . RE_IPV6_ADD . '$/', $ip) );
}
/**
* i.e. not RFC 1918 or similar
* Comes from ProxyTools.php
*/
- public static function IsPublic( $ip ) {
- $n = IP::ToUnsigned( $ip );
+ public static function isPublic( $ip ) {
+ $n = self::toUnsigned( $ip );
if ( !$n ) {
return false;
}
}
foreach ( $privateRanges as $r ) {
- $start = IP::toUnsigned( $r[0] );
- $end = IP::toUnsigned( $r[1] );
+ $start = self::toUnsigned( $r[0] );
+ $end = self::toUnsigned( $r[1] );
if ( $n >= $start && $n <= $end ) {
return false;
}
/**
* Split out an IP block as an array of 4 bytes and a mask,
- * return false if it cant be determined
+ * return false if it can't be determined
*
- * @parameter $ip string A quad dotted IP address
+ * @param $ipblock string A quad dotted/octet IP address
* @return array
*/
public static function toArray( $ipblock ) {
- if(! preg_match( '/^' . RE_IP_ADD . '(?:\/(?:'.RE_IP_PREFIX.'))?' . '$/', $ipblock, $matches ) ) {
- return false;
- } else {
+ $matches = array();
+ if( preg_match( '/^' . RE_IP_ADD . '(?:\/(?:'.RE_IP_PREFIX.'))?' . '$/', $ipblock, $matches ) ) {
return $matches;
+ } else if ( preg_match( '/^' . RE_IPV6_ADD . '(?:\/(?:'.RE_IPV6_PREFIX.'))?' . '$/', $ipblock, $matches ) ) {
+ return $matches;
+ } else {
+ return false;
}
}
/**
- * Return a zero-padded hexadecimal representation of an IP address
- * Comes from ProxyTools.php
- * @param $ip Quad dotted IP address.
+ * Return a zero-padded 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
*/
public static function toHex( $ip ) {
$n = self::toUnsigned( $ip );
if ( $n !== false ) {
- $n = sprintf( '%08X', $n );
+ $n = self::isIPv6($ip) ? "v6-" . wfBaseConvert( $n, 10, 16, 32, false ) : wfBaseConvert( $n, 10, 16, 8, false );
}
return $n;
}
/**
- * Given an IP address in dotted-quad notation, returns an unsigned integer.
+ * 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
*/
public static function toUnsigned( $ip ) {
- $n = ip2long( $ip );
- if ( $n == -1 || $n === false ) { # Return value on error depends on PHP version
- $n = false;
- } elseif ( $n < 0 ) {
+ // Use IPv6 functions if needed
+ if ( self::isIPv6( $ip ) ) {
+ return self::toUnsigned6( $ip );
+ }
+ if ( $ip == '255.255.255.255' ) {
+ $n = -1;
+ } 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 );
}
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;
+ }
+
+ /**
+ * Convert a network specification in CIDR notation to an integer network and a number of bits
+ * @return array(string, int)
+ */
+ public static function parseCIDR( $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];
+ 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
+ * @return array(string, int)
+ */
+ public static function parseRange( $range ) {
+ // Use IPv6 functions if needed
+ if ( self::isIPv6( $range ) ) {
+ return self::parseRange6( $range );
+ }
+ if ( strpos( $range, '/' ) !== false ) {
+ # CIDR
+ 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 );
+ }
+ } 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 ( $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 );
+ }
+ }
+
+ /**
+ * 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.
+ */
+ 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);
+ }
+
+ /**
+ * Convert some unusual representations of IPv4 addresses to their
+ * canonical dotted quad representation.
+ *
+ * This currently only checks a few IPV4-to-IPv6 related cases. More
+ * unusual representations may be added later.
+ *
+ * @param $addr something that might be an IP address
+ * @return valid dotted quad IPv4 address or null
+ */
+ public static function canonicalize( $addr ) {
+ if ( self::isValid( $addr ) )
+ return $addr;
+
+ // Turn mapped addresses from ::ce:ffff:1.2.3.4 to 1.2.3.4
+ if ( strpos($addr,':') !==false && strpos($addr,'.') !==false ) {
+ $addr = substr( $addr, strrpos($addr,':')+1 );
+ if( self::isIPv4($addr) ) return $addr;
+ }
+
+ // IPv6 loopback address
+ $m = array();
+ if ( preg_match( '/^0*' . RE_IPV6_GAP . '1$/', $addr, $m ) )
+ return '127.0.0.1';
+
+ // IPv4-mapped and IPv4-compatible IPv6 addresses
+ if ( preg_match( '/^' . RE_IPV6_V4_PREFIX . '(' . RE_IP_ADD . ')$/i', $addr, $m ) )
+ return $m[1];
+ if ( preg_match( '/^' . RE_IPV6_V4_PREFIX . RE_IPV6_WORD . ':' . RE_IPV6_WORD . '$/i', $addr, $m ) )
+ return long2ip( ( hexdec( $m[1] ) << 16 ) + hexdec( $m[2] ) );
+
+ return null; // give up
+ }
}
-?>
dépôts / lhc / web / wiklou.git / blobdiff