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<?php
/**
* @link http://www.yiiframework.com/
* @copyright Copyright (c) 2008 Yii Software LLC
* @license http://www.yiiframework.com/license/
*/
namespace yii\helpers;
use yii\base\NotSupportedException;
/**
* Class BaseIpHelper provides concrete implementation for [[IpHelper]]
*
* Do not use BaseIpHelper, use [[IpHelper]] instead.
*
* @author Dmytro Naumenko <d.naumenko.a@gmail.com>
* @since 2.0.14
*/
class BaseIpHelper
{
const IPV4 = 4;
const IPV6 = 6;
/**
* The length of IPv6 address in bits
*/
const IPV6_ADDRESS_LENGTH = 128;
/**
* The length of IPv4 address in bits
*/
const IPV4_ADDRESS_LENGTH = 32;
/**
* Gets the IP version. Does not perform IP address validation.
*
* @param string $ip the valid IPv4 or IPv6 address.
* @return int [[IPV4]] or [[IPV6]]
*/
public static function getIpVersion($ip)
{
return strpos($ip, ':') === false ? self::IPV4 : self::IPV6;
}
/**
* Checks whether IP address or subnet $subnet is contained by $subnet.
*
* For example, the following code checks whether subnet `192.168.1.0/24` is in subnet `192.168.0.0/22`:
*
* ```php
* IpHelper::inRange('192.168.1.0/24', '192.168.0.0/22'); // true
* ```
*
* In case you need to check whether a single IP address `192.168.1.21` is in the subnet `192.168.1.0/24`,
* you can use any of theses examples:
*
* ```php
* IpHelper::inRange('192.168.1.21', '192.168.1.0/24'); // true
* IpHelper::inRange('192.168.1.21/32', '192.168.1.0/24'); // true
* ```
*
* @param string $subnet the valid IPv4 or IPv6 address or CIDR range, e.g.: `10.0.0.0/8` or `2001:af::/64`
* @param string $range the valid IPv4 or IPv6 CIDR range, e.g. `10.0.0.0/8` or `2001:af::/64`
* @return bool whether $subnet is contained by $range
*
* @throws NotSupportedException
* @see https://en.wikipedia.org/wiki/Classless_Inter-Domain_Routing
*/
public static function inRange($subnet, $range)
{
list($ip, $mask) = array_pad(explode('/', $subnet), 2, null);
list($net, $netMask) = array_pad(explode('/', $range), 2, null);
$ipVersion = static::getIpVersion($ip);
$netVersion = static::getIpVersion($net);
if ($ipVersion !== $netVersion) {
return false;
}
$maxMask = $ipVersion === self::IPV4 ? self::IPV4_ADDRESS_LENGTH : self::IPV6_ADDRESS_LENGTH;
$mask = isset($mask) ? $mask : $maxMask;
$netMask = isset($netMask) ? $netMask : $maxMask;
$binIp = static::ip2bin($ip);
$binNet = static::ip2bin($net);
return substr($binIp, 0, $netMask) === substr($binNet, 0, $netMask) && $mask >= $netMask;
}
/**
* Expands an IPv6 address to it's full notation.
*
* For example `2001:db8::1` will be expanded to `2001:0db8:0000:0000:0000:0000:0000:0001`
*
* @param string $ip the original valid IPv6 address
* @return string the expanded IPv6 address
*/
public static function expandIPv6($ip)
{
$hex = unpack('H*hex', inet_pton($ip));
return substr(preg_replace('/([a-f0-9]{4})/i', '$1:', $hex['hex']), 0, -1);
}
/**
* Converts IP address to bits representation.
*
* @param string $ip the valid IPv4 or IPv6 address
* @return string bits as a string
* @throws NotSupportedException
*/
public static function ip2bin($ip)
{
$ipBinary = null;
if (static::getIpVersion($ip) === self::IPV4) {
$ipBinary = pack('N', ip2long($ip));
} elseif (@inet_pton('::1') === false) {
throw new NotSupportedException('IPv6 is not supported by inet_pton()!');
} else {
$ipBinary = inet_pton($ip);
}
$result = '';
for ($i = 0, $iMax = strlen($ipBinary); $i < $iMax; $i += 4) {
$result .= str_pad(decbin(unpack('N', substr($ipBinary, $i, 4))[1]), 32, '0', STR_PAD_LEFT);
}
return $result;
}
}