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| 1 | <?php |
| 2 | |
| 3 | declare(strict_types=1); |
| 4 | |
| 5 | namespace Cosray\Util; |
| 6 | |
| 7 | /** |
| 8 | * Single IP addresses and CIDR ranges like `10.0.0.0/8` or `fd00::/8`, |
| 9 | * IPv4 and IPv6 alike. |
| 10 | * |
| 11 | * @internal |
| 12 | */ |
| 13 | final class IpRange |
| 14 | { |
| 15 | public static function valid(string $range): bool |
| 16 | { |
| 17 | return self::parse($range) !== null; |
| 18 | } |
| 19 | |
| 20 | public static function contains(string $range, string $ip): bool |
| 21 | { |
| 22 | $parsed = self::parse($range); |
| 23 | $address = filter_var($ip, FILTER_VALIDATE_IP) === false ? false : inet_pton($ip); |
| 24 | |
| 25 | if ($parsed === null || $address === false || strlen($address) !== strlen($parsed[0])) { |
| 26 | return false; |
| 27 | } |
| 28 | |
| 29 | [$network, $bits] = $parsed; |
| 30 | $bytes = intdiv($bits, 8); |
| 31 | |
| 32 | if (substr($network, 0, $bytes) !== substr($address, 0, $bytes)) { |
| 33 | return false; |
| 34 | } |
| 35 | |
| 36 | $rest = $bits % 8; |
| 37 | |
| 38 | if ($rest === 0) { |
| 39 | return true; |
| 40 | } |
| 41 | |
| 42 | $mask = (0xFF << (8 - $rest)) & 0xFF; |
| 43 | |
| 44 | return (ord($network[$bytes]) & $mask) === (ord($address[$bytes]) & $mask); |
| 45 | } |
| 46 | |
| 47 | /** @return ?array{string, int} the network in binary and its prefix length */ |
| 48 | private static function parse(string $range): ?array |
| 49 | { |
| 50 | $slash = strpos($range, '/'); |
| 51 | $ip = $slash === false ? $range : substr($range, 0, $slash); |
| 52 | $bits = $slash === false ? null : substr($range, $slash + 1); |
| 53 | $network = filter_var($ip, FILTER_VALIDATE_IP) === false ? false : inet_pton($ip); |
| 54 | |
| 55 | if ($network === false) { |
| 56 | return null; |
| 57 | } |
| 58 | |
| 59 | $max = strlen($network) * 8; |
| 60 | |
| 61 | if ($bits === null) { |
| 62 | return [$network, $max]; |
| 63 | } |
| 64 | |
| 65 | if (preg_match('/^\d{1,3}$/', $bits) !== 1 || (int) $bits > $max) { |
| 66 | return null; |
| 67 | } |
| 68 | |
| 69 | return [$network, (int) $bits]; |
| 70 | } |
| 71 | } |