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<?php |
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/* |
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The MIT License (MIT) |
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Copyright (c) 2015 Vectorface, Inc. |
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Permission is hereby granted, free of charge, to any person obtaining a copy |
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of this software and associated documentation files (the "Software"), to deal |
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in the Software without restriction, including without limitation the rights |
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
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copies of the Software, and to permit persons to whom the Software is |
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furnished to do so, subject to the following conditions: |
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The above copyright notice and this permission notice shall be included in |
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all copies or substantial portions of the Software. |
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
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THE SOFTWARE. |
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*/ |
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namespace Vectorface\Whip\IpRange; |
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/** |
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* A class representing an IPv6 address range. |
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* @copyright Vectorface, Inc 2015 |
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* @author Daniel Bruce <[email protected]> |
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*/ |
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class Ipv6Range implements IpRange |
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{ |
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/** The size of the IPv6 range mask. */ |
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private string|false $mask; |
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/** The binary substring of the range minus the mask. */ |
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private string $rangeSubstring; |
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/** |
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* Constructor for the class. |
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* |
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* @param string $range The IPv6 range as a string. Supported range styles: |
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* - CIDR notation (2400:cb00::/32) |
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* - a specific IP address (::1) |
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*/ |
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public function __construct(string $range) |
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{ |
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$this->extractNetworkAndMaskFromRange($range); |
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} |
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/** |
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* Returns whether a given IP address falls within this range. |
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* |
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* @param string $ipAddress The given IP address. |
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* @return bool Returns true if the IP address falls within the range |
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* and false otherwise. |
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3 |
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*/ |
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public function containsIp(string $ipAddress) : bool |
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{ |
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// if the mask is false this means we have a full IP address as a |
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// range so compare against the whole string |
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1 |
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if (false === $this->mask) { |
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return $this->rangeSubstring === $this->convertToBinaryString($ipAddress); |
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} |
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// remove the masked part of the address |
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2 |
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$ipAddressSubstring = substr( |
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$this->convertToBinaryString($ipAddress), |
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0, |
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$this->mask |
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2 |
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); |
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return $this->rangeSubstring === $ipAddressSubstring; |
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} |
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/** |
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* Extracts the mask and binary string substring of the range to compare |
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* against incoming IP addresses. |
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* |
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* @param string $range The IPv6 range as a string. |
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*/ |
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private function extractNetworkAndMaskFromRange(string $range) : void |
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{ |
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if (str_contains($range, '/')) { |
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// handle the CIDR notation |
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list($network, $this->mask) = explode('/', $range); |
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3 |
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// store a substring of the binary representation of the range |
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// minus the masked part |
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$this->rangeSubstring = substr( |
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$this->convertToBinaryString($network), |
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0, |
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$this->mask |
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); |
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} else { |
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// handle a single IP address |
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$this->rangeSubstring = $this->convertToBinaryString($range); |
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$this->mask = false; |
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} |
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} |
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/** |
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* Converts an IPv6 address to a binary string. |
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* |
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* @param string $address The IPv6 address in standard notation. |
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* @return string Returns the address as a string of bits. |
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*/ |
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private function convertToBinaryString(string $address) : string |
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{ |
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return implode('', array_map( |
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[__CLASS__, 'hexToBinary'], |
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str_split(bin2hex(inet_pton($address))) |
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)); |
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} |
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/** |
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* Converts a hexadecimal character to a 4-digit binary string. |
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* |
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* @param string $hex The hexadecimal character. |
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* @return string Returns a 4-digit binary string. |
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*/ |
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private static function hexToBinary(string $hex) : string |
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{ |
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return str_pad(base_convert($hex, 16, 2), 4, '0', STR_PAD_LEFT); |
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} |
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} |
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Vectorface /
whip
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