89 lines
3.5 KiB
PHP
89 lines
3.5 KiB
PHP
<?php
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/**
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* Copyright 2015-2021 Nikita Petko (http://two-time-corp.mfdlabs.local/ui/?petko/)
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*/
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namespace Alphaland\Web {
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class IpHelper
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{
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public static function IsIpv4(string $ip)
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{
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return filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4);
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}
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public static function IsIpv6(string $ip)
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{
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return filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_IPV6);
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}
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public static function IsIp(string $ip)
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{
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return self::IsIpv4($ip) || self::IsIpv6($ip);
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}
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public static function IpIsInRange(string $ip, string $range)
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{
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if (strpos($range, '/') !== false) {
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// $range is in IP/NETMASK format
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list($range, $netmask) = explode('/', $range, 2);
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if (strpos($netmask, '.') !== false) {
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// $netmask is a 255.255.0.0 format
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$netmask = str_replace('*', '0', $netmask);
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$netmask_dec = ip2long($netmask);
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return ((ip2long($ip) & $netmask_dec) == (ip2long($range) & $netmask_dec));
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} else {
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// $netmask is a CIDR size block
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// fix the range argument
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$x = explode('.', $range);
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while (count($x) < 4) $x[] = '0';
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list($a, $b, $c, $d) = $x;
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$range = sprintf("%u.%u.%u.%u", empty($a) ? '0' : $a, empty($b) ? '0' : $b, empty($c) ? '0' : $c, empty($d) ? '0' : $d);
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$range_dec = ip2long($range);
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$ip_dec = ip2long($ip);
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# Strategy 1 - Create the netmask with 'netmask' 1s and then fill it to 32 with 0s
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#$netmask_dec = bindec(str_pad('', $netmask, '1') . str_pad('', 32-$netmask, '0'));
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# Strategy 2 - Use math to create it
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$wildcard_dec = pow(2, (32 - $netmask)) - 1;
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$netmask_dec = ~$wildcard_dec;
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return (($ip_dec & $netmask_dec) == ($range_dec & $netmask_dec));
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}
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} else {
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// range might be 255.255.*.* or 1.2.3.0-1.2.3.255
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if (strpos($range, '*') !== false) { // a.b.*.* format
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// Just convert to A-B format by setting * to 0 for A and 255 for B
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$lower = str_replace('*', '0', $range);
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$upper = str_replace('*', '255', $range);
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$range = "$lower-$upper";
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}
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if (strpos($range, '-') !== false) { // A-B format
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list($lower, $upper) = explode('-', $range, 2);
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$lower_dec = (float)sprintf("%u", ip2long($lower));
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$upper_dec = (float)sprintf("%u", ip2long($upper));
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$ip_dec = (float)sprintf("%u", ip2long($ip));
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return (($ip_dec >= $lower_dec) && ($ip_dec <= $upper_dec));
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}
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return false;
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}
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}
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public static function IsIpInCidrRange(string $ip, string $cidr)
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{
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list($subnet, $bits) = explode('/', $cidr);
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if ($bits === null) {
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$bits = 32;
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}
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$ip = ip2long($ip);
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$subnet = ip2long($subnet);
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$mask = -1 << (32 - $bits);
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$subnet &= $mask; # nb: in case the supplied subnet wasn't correctly aligned
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return ($ip & $mask) == $subnet;
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}
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}
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}
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