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<?php |
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/** |
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* These helpful functions were lifted from the Symfony library |
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* https://github.com/symfony/http-foundation/blob/master/LICENSE |
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* |
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* Http utility functions. |
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* |
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* @author Fabien Potencier <[email protected]> |
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*/ |
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namespace SilverStripe\Control; |
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/** |
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* Http utility functions. |
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* |
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* @author Fabien Potencier <[email protected]> |
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*/ |
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class IPUtils |
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{ |
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/** |
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* This class should not be instantiated. |
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*/ |
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private function __construct() |
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{ |
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} |
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/** |
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* Checks if an IPv4 or IPv6 address is contained in the list of given IPs or subnets. |
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* |
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* @param string $requestIP IP to check |
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* @param string|array $ips List of IPs or subnets (can be a string if only a single one) |
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* |
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* @return bool Whether the IP is valid |
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* |
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* @package framework |
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* @subpackage core |
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*/ |
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public static function checkIP($requestIP, $ips) |
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{ |
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if (!is_array($ips)) { |
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$ips = array($ips); |
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} |
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$method = substr_count($requestIP, ':') > 1 ? 'checkIP6' : 'checkIP4'; |
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foreach ($ips as $ip) { |
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if (self::$method($requestIP, trim($ip))) { |
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return true; |
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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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* Compares two IPv4 addresses. |
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* In case a subnet is given, it checks if it contains the request IP. |
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* |
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* @param string $requestIP IPv4 address to check |
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* @param string $ip IPv4 address or subnet in CIDR notation |
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* |
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* @return bool Whether the request IP matches the IP, or whether the request IP is within the CIDR subnet |
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*/ |
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public static function checkIP4($requestIP, $ip) |
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{ |
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if (!filter_var($requestIP, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4)) { |
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return false; |
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} |
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if (false !== strpos($ip, '/')) { |
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list($address, $netmask) = explode('/', $ip, 2); |
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if ($netmask === '0') { |
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return filter_var($address, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4); |
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} |
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if ($netmask < 0 || $netmask > 32) { |
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return false; |
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} |
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} else { |
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$address = $ip; |
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$netmask = 32; |
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} |
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$result = substr_compare( |
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sprintf('%032b', ip2long($requestIP)), |
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sprintf('%032b', ip2long($address)), |
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0, |
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$netmask |
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); |
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return 0 === $result; |
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} |
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/** |
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* Compares two IPv6 addresses. |
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* In case a subnet is given, it checks if it contains the request IP. |
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* |
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* @author David Soria Parra <dsp at php dot net> |
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* |
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* @see https://github.com/dsp/v6tools |
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* |
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* @param string $requestIP IPv6 address to check |
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* @param string $ip IPv6 address or subnet in CIDR notation |
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* |
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* @return bool Whether the IP is valid |
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* |
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* @throws \RuntimeException When IPV6 support is not enabled |
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*/ |
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public static function checkIP6($requestIP, $ip) |
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{ |
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if (!((extension_loaded('sockets') && defined('AF_INET6')) || @inet_pton('::1'))) { |
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throw new \RuntimeException( |
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'Unable to check IPv6. Check that PHP was not compiled with option "disable-ipv6".' |
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); |
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} |
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if (false !== strpos($ip, '/')) { |
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list($address, $netmask) = explode('/', $ip, 2); |
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if ($netmask < 1 || $netmask > 128) { |
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return false; |
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} |
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} else { |
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$address = $ip; |
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$netmask = 128; |
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} |
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$bytesAddr = unpack('n*', @inet_pton($address)); |
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$bytesTest = unpack('n*', @inet_pton($requestIP)); |
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if (!$bytesAddr || !$bytesTest) { |
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return false; |
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} |
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for ($i = 1, $ceil = ceil($netmask / 16); $i <= $ceil; ++$i) { |
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$left = $netmask - 16 * ($i - 1); |
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$left = ($left <= 16) ? $left : 16; |
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$mask = ~(0xffff >> $left) & 0xffff; |
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if (($bytesAddr[$i] & $mask) != ($bytesTest[$i] & $mask)) { |
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return false; |
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} |
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} |
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return true; |
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} |
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} |
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silverstripe /
silverstripe-framework
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