104 lines
No EOL
2.8 KiB
PHP
104 lines
No EOL
2.8 KiB
PHP
<?php
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namespace App\Services;
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use Exception;
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class Subnet
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{
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/**
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* Calculate subnet
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*
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* @param string $subnet
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* @return array
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* @throws \Exception
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*/
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public static function calculate(string $subnet): array
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{
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[$ip, $cidr] = explode('/', $subnet);
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if (filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4)) {
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return self::calculateIPv4($ip, intval($cidr));
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} elseif (filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_IPV6)) {
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return self::calculateIPv6($ip, intval($cidr));
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} else {
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throw new Exception("Invalid IP address.");
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}
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}
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/**
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* Calculate IPv4
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*
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* @param string $ip
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* @param int $cidr
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* @return array
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* @throws \Exception
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*/
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private static function calculateIPv4(string $ip, int $cidr): array
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{
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if ($cidr < 0 || $cidr > 32) {
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throw new Exception("CIDR must be between 0 and 32.");
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}
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$hosts = (1 << (32 - $cidr)) - 2; // Excludes network and broadcast
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$ipLong = ip2long($ip);
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$mask = -1 << (32 - $cidr);
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$network = $ipLong & $mask;
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$firstIP = $network + 1;
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$lastIP = $network + $hosts;
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return [
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'network' => long2ip($network),
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'first' => long2ip($firstIP),
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'last' => long2ip($lastIP),
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'hosts' => $hosts,
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];
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}
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/**
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* Calculate IPv6
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*
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* @param string $ip
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* @param int $cidr
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* @return array
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* @throws \Exception
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*/
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private static function calculateIPv6(string $ip, int $cidr): array
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{
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if ($cidr < 0 || $cidr > 128) {
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throw new Exception("CIDR must be between 0 and 128.");
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}
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// Convert IP to binary representation
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$binaryIP = inet_pton($ip);
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if ($binaryIP === false) {
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throw new Exception("Failed to parse IPv6 address.");
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}
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// Calculate network address
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$network = substr($binaryIP, 0, intval($cidr / 8));
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$remainder = $cidr % 8;
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if ($remainder > 0) {
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$lastByte = ord($binaryIP[$cidr / 8]) & (0xFF << (8 - $remainder));
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$network .= chr($lastByte);
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}
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// Pad the rest with zeros
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$network = str_pad($network, 16, "\0");
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// Calculate first and last addresses
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$networkAddress = inet_ntop($network);
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$totalHosts = $cidr == 128 ? 1 : bcpow(2, 128 - $cidr);
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$firstHost = ($cidr == 128) ? $networkAddress : inet_ntop($network);
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$lastHost = inet_ntop(pack("H*", str_repeat("F", 32)));
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return [
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'network' => $networkAddress,
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'first' => $firstHost,
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'last' => $lastHost,
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'hosts' => $totalHosts,
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];
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}
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} |