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523
libraries/f0f/utils/ip/ip.php
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523
libraries/f0f/utils/ip/ip.php
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<?php
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/**
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* @package FrameworkOnFramework
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* @subpackage utils
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* @copyright Copyright (C) 2010-2016 Nicholas K. Dionysopoulos / Akeeba Ltd. All rights reserved.
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* @license GNU General Public License version 2 or later; see LICENSE.txt
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*/
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defined('F0F_INCLUDED') or die;
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/**
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* IP address utilities
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*/
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abstract class F0FUtilsIp
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{
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/** @var string The IP address of the current visitor */
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protected static $ip = null;
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/**
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* Should I allow IP overrides through X-Forwarded-For or Client-Ip HTTP headers?
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*
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* @var bool
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*/
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protected static $allowIpOverrides = true;
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/**
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* Get the current visitor's IP address
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*
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* @return string
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*/
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public static function getIp()
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{
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if (is_null(static::$ip))
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{
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$ip = self::detectAndCleanIP();
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if (!empty($ip) && ($ip != '0.0.0.0') && function_exists('inet_pton') && function_exists('inet_ntop'))
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{
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$myIP = @inet_pton($ip);
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if ($myIP !== false)
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{
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$ip = inet_ntop($myIP);
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}
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}
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static::setIp($ip);
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}
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return static::$ip;
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}
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/**
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* Set the IP address of the current visitor
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*
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* @param string $ip
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*
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* @return void
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*/
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public static function setIp($ip)
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{
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static::$ip = $ip;
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}
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/**
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* Is it an IPv6 IP address?
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*
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* @param string $ip An IPv4 or IPv6 address
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*
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* @return boolean True if it's IPv6
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*/
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public static function isIPv6($ip)
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{
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if (strstr($ip, ':'))
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{
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return true;
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}
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return false;
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}
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/**
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* Checks if an IP is contained in a list of IPs or IP expressions
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*
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* @param string $ip The IPv4/IPv6 address to check
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* @param array|string $ipTable An IP expression (or a comma-separated or array list of IP expressions) to check against
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*
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* @return null|boolean True if it's in the list
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*/
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public static function IPinList($ip, $ipTable = '')
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{
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// No point proceeding with an empty IP list
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if (empty($ipTable))
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{
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return false;
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}
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// If the IP list is not an array, convert it to an array
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if (!is_array($ipTable))
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{
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if (strpos($ipTable, ',') !== false)
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{
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$ipTable = explode(',', $ipTable);
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$ipTable = array_map(function($x) { return trim($x); }, $ipTable);
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}
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else
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{
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$ipTable = trim($ipTable);
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$ipTable = array($ipTable);
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}
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}
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// If no IP address is found, return false
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if ($ip == '0.0.0.0')
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{
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return false;
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}
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// If no IP is given, return false
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if (empty($ip))
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{
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return false;
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}
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// Sanity check
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if (!function_exists('inet_pton'))
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{
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return false;
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}
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// Get the IP's in_adds representation
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$myIP = @inet_pton($ip);
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// If the IP is in an unrecognisable format, quite
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if ($myIP === false)
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{
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return false;
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}
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$ipv6 = self::isIPv6($ip);
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foreach ($ipTable as $ipExpression)
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{
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$ipExpression = trim($ipExpression);
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// Inclusive IP range, i.e. 123.123.123.123-124.125.126.127
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if (strstr($ipExpression, '-'))
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{
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list($from, $to) = explode('-', $ipExpression, 2);
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if ($ipv6 && (!self::isIPv6($from) || !self::isIPv6($to)))
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{
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// Do not apply IPv4 filtering on an IPv6 address
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continue;
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}
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elseif (!$ipv6 && (self::isIPv6($from) || self::isIPv6($to)))
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{
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// Do not apply IPv6 filtering on an IPv4 address
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continue;
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}
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$from = @inet_pton(trim($from));
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$to = @inet_pton(trim($to));
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// Sanity check
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if (($from === false) || ($to === false))
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{
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continue;
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}
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// Swap from/to if they're in the wrong order
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if ($from > $to)
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{
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list($from, $to) = array($to, $from);
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}
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if (($myIP >= $from) && ($myIP <= $to))
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{
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return true;
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}
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}
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// Netmask or CIDR provided
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elseif (strstr($ipExpression, '/'))
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{
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$binaryip = self::inet_to_bits($myIP);
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list($net, $maskbits) = explode('/', $ipExpression, 2);
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if ($ipv6 && !self::isIPv6($net))
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{
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// Do not apply IPv4 filtering on an IPv6 address
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continue;
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}
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elseif (!$ipv6 && self::isIPv6($net))
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{
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// Do not apply IPv6 filtering on an IPv4 address
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continue;
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}
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elseif ($ipv6 && strstr($maskbits, ':'))
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{
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// Perform an IPv6 CIDR check
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if (self::checkIPv6CIDR($myIP, $ipExpression))
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{
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return true;
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}
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// If we didn't match it proceed to the next expression
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continue;
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}
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elseif (!$ipv6 && strstr($maskbits, '.'))
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{
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// Convert IPv4 netmask to CIDR
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$long = ip2long($maskbits);
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$base = ip2long('255.255.255.255');
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$maskbits = 32 - log(($long ^ $base) + 1, 2);
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}
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// Convert network IP to in_addr representation
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$net = @inet_pton($net);
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// Sanity check
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if ($net === false)
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{
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continue;
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}
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// Get the network's binary representation
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$binarynet = self::inet_to_bits($net);
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$expectedNumberOfBits = $ipv6 ? 128 : 24;
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$binarynet = str_pad($binarynet, $expectedNumberOfBits, '0', STR_PAD_RIGHT);
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// Check the corresponding bits of the IP and the network
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$ip_net_bits = substr($binaryip, 0, $maskbits);
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$net_bits = substr($binarynet, 0, $maskbits);
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if ($ip_net_bits == $net_bits)
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{
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return true;
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}
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}
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else
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{
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// IPv6: Only single IPs are supported
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if ($ipv6)
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{
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$ipExpression = trim($ipExpression);
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if (!self::isIPv6($ipExpression))
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{
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continue;
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}
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$ipCheck = @inet_pton($ipExpression);
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if ($ipCheck === false)
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{
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continue;
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}
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if ($ipCheck == $myIP)
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{
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return true;
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}
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}
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else
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{
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// Standard IPv4 address, i.e. 123.123.123.123 or partial IP address, i.e. 123.[123.][123.][123]
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$dots = 0;
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if (substr($ipExpression, -1) == '.')
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{
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// Partial IP address. Convert to CIDR and re-match
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foreach (count_chars($ipExpression, 1) as $i => $val)
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{
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if ($i == 46)
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{
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$dots = $val;
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}
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}
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switch ($dots)
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{
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case 1:
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$netmask = '255.0.0.0';
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$ipExpression .= '0.0.0';
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break;
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case 2:
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$netmask = '255.255.0.0';
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$ipExpression .= '0.0';
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break;
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case 3:
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$netmask = '255.255.255.0';
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$ipExpression .= '0';
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break;
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default:
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$dots = 0;
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}
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if ($dots)
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{
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$binaryip = self::inet_to_bits($myIP);
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// Convert netmask to CIDR
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$long = ip2long($netmask);
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$base = ip2long('255.255.255.255');
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$maskbits = 32 - log(($long ^ $base) + 1, 2);
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$net = @inet_pton($ipExpression);
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// Sanity check
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if ($net === false)
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{
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continue;
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}
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// Get the network's binary representation
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$binarynet = self::inet_to_bits($net);
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$expectedNumberOfBits = $ipv6 ? 128 : 24;
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$binarynet = str_pad($binarynet, $expectedNumberOfBits, '0', STR_PAD_RIGHT);
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// Check the corresponding bits of the IP and the network
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$ip_net_bits = substr($binaryip, 0, $maskbits);
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$net_bits = substr($binarynet, 0, $maskbits);
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if ($ip_net_bits == $net_bits)
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{
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return true;
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}
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}
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}
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if (!$dots)
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{
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$ip = @inet_pton(trim($ipExpression));
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if ($ip == $myIP)
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{
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return true;
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}
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}
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}
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}
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}
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return false;
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}
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/**
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* Works around the REMOTE_ADDR not containing the user's IP
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*/
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public static function workaroundIPIssues()
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{
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$ip = self::getIp();
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if ($_SERVER['REMOTE_ADDR'] == $ip)
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{
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return;
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}
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if (array_key_exists('REMOTE_ADDR', $_SERVER))
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{
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$_SERVER['FOF_REMOTE_ADDR'] = $_SERVER['REMOTE_ADDR'];
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}
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elseif (function_exists('getenv'))
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{
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if (getenv('REMOTE_ADDR'))
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{
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$_SERVER['FOF_REMOTE_ADDR'] = getenv('REMOTE_ADDR');
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}
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}
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$_SERVER['REMOTE_ADDR'] = $ip;
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}
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/**
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* Should I allow the remote client's IP to be overridden by an X-Forwarded-For or Client-Ip HTTP header?
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*
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* @param bool $newState True to allow the override
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*
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* @return void
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*/
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public static function setAllowIpOverrides($newState)
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{
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self::$allowIpOverrides = $newState ? true : false;
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}
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/**
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* Gets the visitor's IP address. Automatically handles reverse proxies
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* reporting the IPs of intermediate devices, like load balancers. Examples:
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* https://www.akeebabackup.com/support/admin-tools/13743-double-ip-adresses-in-security-exception-log-warnings.html
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* http://stackoverflow.com/questions/2422395/why-is-request-envremote-addr-returning-two-ips
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* The solution used is assuming that the last IP address is the external one.
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*
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* @return string
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*/
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protected static function detectAndCleanIP()
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{
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$ip = self::detectIP();
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if ((strstr($ip, ',') !== false) || (strstr($ip, ' ') !== false))
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{
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$ip = str_replace(' ', ',', $ip);
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$ip = str_replace(',,', ',', $ip);
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$ips = explode(',', $ip);
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$ip = '';
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while (empty($ip) && !empty($ips))
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{
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$ip = array_pop($ips);
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$ip = trim($ip);
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}
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}
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else
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{
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$ip = trim($ip);
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}
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return $ip;
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}
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/**
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* Gets the visitor's IP address
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*
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* @return string
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*/
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protected static function detectIP()
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{
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// Normally the $_SERVER superglobal is set
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if (isset($_SERVER))
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{
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// Do we have an x-forwarded-for HTTP header (e.g. NginX)?
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if (self::$allowIpOverrides && array_key_exists('HTTP_X_FORWARDED_FOR', $_SERVER))
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{
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return $_SERVER['HTTP_X_FORWARDED_FOR'];
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}
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// Do we have a client-ip header (e.g. non-transparent proxy)?
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if (self::$allowIpOverrides && array_key_exists('HTTP_CLIENT_IP', $_SERVER))
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{
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return $_SERVER['HTTP_CLIENT_IP'];
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}
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// Normal, non-proxied server or server behind a transparent proxy
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return $_SERVER['REMOTE_ADDR'];
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}
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// This part is executed on PHP running as CGI, or on SAPIs which do
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// not set the $_SERVER superglobal
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// If getenv() is disabled, you're screwed
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if (!function_exists('getenv'))
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{
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return '';
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}
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// Do we have an x-forwarded-for HTTP header?
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if (self::$allowIpOverrides && getenv('HTTP_X_FORWARDED_FOR'))
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{
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return getenv('HTTP_X_FORWARDED_FOR');
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}
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// Do we have a client-ip header?
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if (self::$allowIpOverrides && getenv('HTTP_CLIENT_IP'))
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{
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return getenv('HTTP_CLIENT_IP');
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}
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// Normal, non-proxied server or server behind a transparent proxy
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if (getenv('REMOTE_ADDR'))
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{
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return getenv('REMOTE_ADDR');
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}
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// Catch-all case for broken servers, apparently
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return '';
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}
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/**
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* Converts inet_pton output to bits string
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*
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* @param string $inet The in_addr representation of an IPv4 or IPv6 address
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*
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* @return string
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*/
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protected static function inet_to_bits($inet)
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{
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if (strlen($inet) == 4)
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{
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$unpacked = unpack('A4', $inet);
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}
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else
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{
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$unpacked = unpack('A16', $inet);
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}
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$unpacked = str_split($unpacked[1]);
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$binaryip = '';
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foreach ($unpacked as $char)
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{
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$binaryip .= str_pad(decbin(ord($char)), 8, '0', STR_PAD_LEFT);
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}
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return $binaryip;
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}
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/**
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* Checks if an IPv6 address $ip is part of the IPv6 CIDR block $cidrnet
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*
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* @param string $ip The IPv6 address to check, e.g. 21DA:00D3:0000:2F3B:02AC:00FF:FE28:9C5A
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* @param string $cidrnet The IPv6 CIDR block, e.g. 21DA:00D3:0000:2F3B::/64
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*
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* @return bool
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*/
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protected static function checkIPv6CIDR($ip, $cidrnet)
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{
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$ip = inet_pton($ip);
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$binaryip=self::inet_to_bits($ip);
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list($net,$maskbits)=explode('/',$cidrnet);
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$net=inet_pton($net);
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$binarynet=self::inet_to_bits($net);
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$ip_net_bits=substr($binaryip,0,$maskbits);
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$net_bits =substr($binarynet,0,$maskbits);
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return $ip_net_bits === $net_bits;
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}
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}
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