Hướng dẫn dùng cidrmatch trong PHP

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CIDR match

CIDRmatch is a library to match an IP to an IP range in CIDR notation (IPv4 and IPv6).

NOTE: Symfony2 already does everything this library here does with its IpUtils module. Unfortunately I discovered this only after I finished working on this library.

Usage

$cidrMatch = new CIDRmatch();
$cidrMatch->match($ip, $cidr);

Tests

./vendor/bin/phpunit tests/CIDRmatchTest

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	<?php
	namespace CIDRmatch;

	/** CIDR match
	* ================================================================================
	* IDRmatch is a library to match an IP to an IP range in CIDR notation (IPv4 and
	* IPv6).
	* ================================================================================
	* @package CIDRmatch
	* @author Thomas Lutz
	* @copyright Copyright (c) 2015 - present Thomas Lutz
	* @license http://tholu.mit-license.org
	* ================================================================================
	*/

	class CIDRmatch
	{

	public function match($ip, $cidr)
	{
	$c = explode('/', $cidr);
	$subnet = isset($c[0]) ? $c[0] : NULL;
	$mask = isset($c[1]) ? $c[1] : NULL;

	if (filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4)) {
	// it's valid
	$ipVersion = 'v4';
	} else {
	// it's not valid
	if (filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_IPV6)) {
	// it's valid
	$ipVersion = 'v6';
	} else {
	// it's not valid
	return false;
	}
	}

	switch ($ipVersion) {
	case 'v4':
	if ($mask === null) {
	$mask = 32;
	}

	return $this->IPv4Match($ip, $subnet, $mask);
	break;
	case 'v6':
	if ($mask === null) {
	$mask = 128;
	}

	return $this->IPv6Match($ip, $subnet, $mask);
	break;
	}
	}

	// inspired by: http://stackoverflow.com/questions/7951061/matching-ipv6-address-to-a-cidr-subnet
	private function IPv6MaskToByteArray($subnetMask)
	{
	$addr = str_repeat("f", $subnetMask / 4);
	switch ($subnetMask % 4) {
	case 0:
	break;
	case 1:
	$addr .= "8";
	break;
	case 2:
	$addr .= "c";
	break;
	case 3:
	$addr .= "e";
	break;
	}
	$addr = str_pad($addr, 32, '0');
	$addr = pack("H*", $addr);

	return $addr;
	}

	// inspired by: http://stackoverflow.com/questions/7951061/matching-ipv6-address-to-a-cidr-subnet
	private function IPv6Match($address, $subnetAddress, $subnetMask)
	{
	if (!filter_var($subnetAddress, FILTER_VALIDATE_IP, FILTER_FLAG_IPV6) \|\| $subnetMask === NULL \|\| $subnetMask === "" \|\| $subnetMask < 0 \|\| $subnetMask > 128) {
	return false;
	}
	$subnet = inet_pton($subnetAddress);
	$addr = inet_pton($address);

	$binMask = $this->IPv6MaskToByteArray($subnetMask);

	return ($addr & $binMask) == $subnet;
	}

	// inspired by: http://stackoverflow.com/questions/594112/matching-an-ip-to-a-cidr-mask-in-php5
	private function IPv4Match($address, $subnetAddress, $subnetMask)
	{
	if (!filter_var($subnetAddress, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4) \|\| $subnetMask === NULL \|\| $subnetMask === "" \|\| $subnetMask < 0 \|\| $subnetMask > 32) {
	return false;
	}

	$address = ip2long($address);
	$subnetAddress = ip2long($subnetAddress);
	$mask = -1 << (32 - $subnetMask);
	$subnetAddress &= $mask; # nb: in case the supplied subnet wasn't correctly aligned
	return ($address & $mask) == $subnetAddress;
	}

	}