CidrCheck.php
37 lines
| 1 | <?php |
| 2 | |
| 3 | namespace LLAR\Lib; |
| 4 | |
| 5 | class CidrCheck { |
| 6 | |
| 7 | public function match($ip, $cidr) { |
| 8 | |
| 9 | if (!filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4)) { |
| 10 | |
| 11 | return false; |
| 12 | } |
| 13 | |
| 14 | $c = explode('/', $cidr); |
| 15 | $subnet = isset($c[0]) ? $c[0] : NULL; |
| 16 | $mask = isset($c[1]) ? $c[1] : NULL; |
| 17 | if ($mask === null) { |
| 18 | $mask = 32; |
| 19 | } |
| 20 | |
| 21 | return $this->IPv4Match($ip, $subnet, $mask); |
| 22 | } |
| 23 | |
| 24 | private function IPv4Match($address, $subnetAddress, $subnetMask) { |
| 25 | |
| 26 | if (!filter_var($subnetAddress, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4) || $subnetMask === NULL || $subnetMask === "" || $subnetMask < 0 || $subnetMask > 32) { |
| 27 | return false; |
| 28 | } |
| 29 | |
| 30 | $address = ip2long($address); |
| 31 | $subnetAddress = ip2long($subnetAddress); |
| 32 | $mask = -1 << (32 - $subnetMask); |
| 33 | $subnetAddress &= $mask; # nb: in case the supplied subnet wasn't correctly aligned |
| 34 | return ($address & $mask) == $subnetAddress; |
| 35 | } |
| 36 | |
| 37 | } |