Aktualisierung auf Version 1.8.1

1 files changed, 211 insertions, 0 deletions

diff --git a/includes/IP.php b/includes/IP.php
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+++ b/includes/IP.php
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+<?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_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)');
+define( 'RE_IP_BLOCK', RE_IP_ADD . '\/' . RE_IP_PREFIX);
+
+class IP {
+
+	/**
+	 * Validate an IP address.
+	 * @return boolean True if it is valid.
+	 */
+	public static function isValid( $ip ) {
+		return preg_match( '/^' . RE_IP_ADD . '$/', $ip, $matches) ;
+	}
+
+	/**
+	 * 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
+	 */
+	public static function isPublic( $ip ) {
+		$n = IP::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 = IP::toUnsigned( $r[0] );
+			$end = IP::toUnsigned( $r[1] );
+			if ( $n >= $start && $n <= $end ) {
+				return false;
+			}
+		}
+		return true;
+	}
+
+	/**
+	 * Split out an IP block as an array of 4 bytes and a mask,
+	 * return false if it cant be determined
+	 *
+	 * @parameter $ip string A quad dotted IP address
+	 * @return array
+	 */
+	public static function toArray( $ipblock ) {
+		if(! preg_match( '/^' . RE_IP_ADD . '(?:\/(?:'.RE_IP_PREFIX.'))?' . '$/', $ipblock, $matches ) ) {
+			return false;
+		} else {
+			return $matches;
+		}
+	}
+
+	/**
+	 * 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 IP address.
+	 */
+	public static function toHex( $ip ) {
+		$n = self::toUnsigned( $ip );
+		if ( $n !== false ) {
+			$n = sprintf( '%08X', $n );
+		}
+		return $n;
+	}
+
+	/**
+	 * Given an IP address in dotted-quad 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.
+	 */
+	public static function toUnsigned( $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
+	 */
+	public static function parseCIDR( $range ) {
+		$parts = explode( '/', $range, 2 );
+		if ( count( $parts ) != 2 ) {
+			return array( false, false );
+		}
+		$network = IP::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
+	 */
+	public static function parseRange( $range ) {
+		if ( strpos( $range, '/' ) !== false ) {
+			# CIDR
+			list( $network, $bits ) = IP::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 ( $start > $end ) {
+				$start = $end = false;
+			} else {
+				$start = IP::toHex( $start );
+				$end = IP::toHex( $end );
+			}
+		} else {
+			# Single IP
+			$start = $end = IP::toHex( $range );
+		}
+		if ( $start === false || $end === false ) {
+			return array( false, false );
+		} else {				
+			return array( $start, $end );
+		}
+	}
+}
+?>