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<?php |
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namespace Jasny; |
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/** |
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* Convert an IPv4 address or CIDR into an IP6 address or CIDR. |
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* |
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* @param string $ip |
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* @return string |
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* @throws \InvalidArgumentException if ip isn't valid |
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*/ |
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function ipv4_to_ipv6($ip) |
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{ |
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if ($ip === '0.0.0.0/0') { |
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1 |
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return '::'; |
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} |
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list($address, $mask) = explode('/', $ip, 2) + [null, null]; |
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if (!filter_var($address, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4) || (isset($mask) && !ctype_digit($mask))) { |
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throw new \InvalidArgumentException("'$ip' is not a valid IPv4 address or cidr"); |
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} |
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$bytes = array_map('dechex', explode('.', $address)); |
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return vsprintf('0:0:0:0:0:ffff:%02s%02s:%02s%02s', $bytes) . (isset($mask) ? '/' . ($mask + 96) : ''); |
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} |
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/** |
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* Check if IP address is in CIDR block |
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* |
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* @param string $ip An IPv4 or IPv6 |
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* @param string $cidr An IPv4 CIDR block or IPv6 CIDR block |
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* @return boolean |
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*/ |
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function ip_in_cidr($ip, $cidr) |
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{ |
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if ($cidr === '0.0.0.0/0' || $cidr === '::/0' || $cidr === '::') { |
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return true; |
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} |
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$ipv = strpos($ip, ':') === false ? 4 : 6; |
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33 |
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$cidrv = strpos($cidr, ':') === false ? 4 : 6; |
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try { |
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if ($ipv < $cidrv) { |
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$ip = ipv4_to_ipv6($ip); |
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$ipv = 6; |
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} elseif ($ipv > $cidrv) { |
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$cidr = ipv4_to_ipv6($cidr); |
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} |
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} catch (\InvalidArgumentException $e) { |
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return false; |
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} |
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$fn = __NAMESPACE__ . "\\ipv{$ipv}_in_cidr"; |
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return $fn($ip, $cidr); |
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} |
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/** |
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* Check if IPv4 address is in CIDR block |
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* |
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* @param string $ip |
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* @param string $cidr |
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* @return boolean |
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*/ |
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function ipv4_in_cidr($ip, $cidr) |
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{ |
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list($subnet, $mask) = explode('/', $cidr, 2) + [null, '32']; |
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if ( |
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!filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4) || |
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!filter_var($subnet, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4) |
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) { |
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return false; |
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} |
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$ipLong = ip2long($ip); |
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$subnetLong = ip2long($subnet); |
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$ipMasked = $ipLong & ~((1 << (32 - $mask)) - 1); |
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$subnetMasked = $subnetLong & ~((1 << (32 - $mask)) - 1); |
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return $ipMasked == $subnetMasked; |
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} |
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/** |
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* Check if IPv6 address is in CIDR block |
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* |
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* @param string $ip |
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* @param string $cidr |
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* @return boolean |
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*/ |
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function ipv6_in_cidr($ip, $cidr) |
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{ |
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if (!filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_IPV6)) { |
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return false; |
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} |
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$inetIp = inet_pton($ip); |
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$binaryIp = inet_to_bits($inetIp); |
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if (strpos($cidr, '/') === false) { |
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3 |
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$net = $cidr; |
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3 |
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$mask = $cidr === '::' ? 0 : substr_count(rtrim($cidr, ':'), ':') * 16; |
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} else { |
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list($net, $mask) = explode('/', $cidr, 2); |
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} |
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if (!filter_var($net, FILTER_VALIDATE_IP, FILTER_FLAG_IPV6)) { |
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return false; |
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} |
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$inetNet = inet_pton($net); |
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$binaryNet = inet_to_bits($inetNet); |
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$ipNetBits = substr($binaryIp, 0, $mask); |
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$netBits = substr($binaryNet, 0, $mask); |
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return $ipNetBits === $netBits; |
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} |
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/** |
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* Converts inet_pton output to string with bits. |
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* |
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* @param string $inet |
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* @return string |
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*/ |
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function inet_to_bits($inet) |
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{ |
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$unpackedArr = unpack('A16', $inet); |
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$unpacked = str_split($unpackedArr[1]); |
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$binaryip = ''; |
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foreach ($unpacked as $char) { |
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$binaryip .= str_pad(decbin(ord($char)), 8, '0', STR_PAD_LEFT); |
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} |
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return str_pad($binaryip, 128, '0', STR_PAD_RIGHT); |
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} |
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jasny /
php-functions
