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<?php
namespace LLAR\Lib;
class CidrCheck {
public function match($ip, $cidr) {
if (!filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4)) {
return false;
}
$c = explode('/', $cidr);
$subnet = isset($c[0]) ? $c[0] : NULL;
$mask = isset($c[1]) ? $c[1] : NULL;
if ($mask === null) {
$mask = 32;
}
return $this->IPv4Match($ip, $subnet, $mask);
}
private function IPv4Match($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;
}
}