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. Check that PHP was not compiled with option "disable-ipv6".');
}
// Check to see if we were given a IP4 $requestIp or $ip by mistake
if (!filter_var($requestIp, \FILTER_VALIDATE_IP, \FILTER_FLAG_IPV6)) {
return self::$checkedIps[$cacheKey] = false;
}
if (str_contains($ip, '/')) {
[$address, $netmask] = explode('/', $ip, 2);
if (!filter_var($address, \FILTER_VALIDATE_IP, \FILTER_FLAG_IPV6)) {
return self::$checkedIps[$cacheKey] = false;
}
if ('0' === $netmask) {
return (bool) unpack('n*', @inet_pton($address));
}
if ($netmask < 1 || $netmask > 128) {
return self::$checkedIps[$cacheKey] = false;
}
} else {
if (!filter_var($ip, \FILTER_VALIDATE_IP, \FILTER_FLAG_IPV6)) {
return self::$checkedIps[$cacheKey] = false;
}
$address = $ip;
$netmask = 128;
}
$bytesAddr = unpack('n*', @inet_pton($address));
$bytesTest = unpack('n*', @inet_pton($requestIp));
if (!$bytesAddr || !$bytesTest) {
return self::$checkedIps[$cacheKey] = false;
}
for ($i = 1, $ceil = ceil($netmask / 16); $i <= $ceil; ++$i) {
$left = $netmask - 16 * ($i - 1);
$left = ($left <= 16) ? $left : 16;
$mask = ~(0xFFFF >> $left) & 0xFFFF;
if (($bytesAddr[$i] & $mask) != ($bytesTest[$i] & $mask)) {
return self::$checkedIps[$cacheKey] = false;
}
}
return self::$checkedIps[$cacheKey] = true;
}
/**
* Anonymizes an IP/IPv6.
*
* Removes the last byte for v4 and the last 8 bytes for v6 IPs
*/
public static function anonymize(string $ip): string
{
$wrappedIPv6 = false;
if ('[' === substr($ip, 0, 1) && ']' === substr($ip, -1, 1)) {
$wrappedIPv6 = true;
$ip = substr($ip, 1, -1);
}
$packedAddress = inet_pton($ip);
if (4 === \strlen($packedAddress)) {
$mask = '255.255.255.0';
} elseif ($ip === inet_ntop($packedAddress & inet_pton('::ffff:ffff:ffff'))) {
$mask = '::ffff:ffff:ff00';
} elseif ($ip === inet_ntop($packedAddress & inet_pton('::ffff:ffff'))) {
$mask = '::ffff:ff00';
} else {
$mask = 'ffff:ffff:ffff:ffff:0000:0000:0000:0000';
}
$ip = inet_ntop($packedAddress & inet_pton($mask));
if ($wrappedIPv6) {
$ip = '['.$ip.']';
}
return $ip;
}
}
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