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<?php
declare(strict_types=1);
/*
* This file is part of Badcow DNS Library.
*
* (c) Samuel Williams <sam@badcow.co>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Badcow\DNS\Edns\Option;
/**
* @see https://www.rfc-editor.org/rfc/rfc7871.html#section-6
*/
class CLIENT_SUBNET implements OptionInterface
{
use OptionTrait;
public const NAME = 'CLIENT_SUBNET';
public const CODE = 8;
public const FAMILY_IPV4 = 1;
public const FAMILY_IPV6 = 2;
/**
* @var int|null
*/
protected $family;
/**
* @var int|null
*/
protected $sourceNetmask;
/**
* @var int|null
*/
protected $scopeNetmask;
/**
* @var string|null
*/
protected $address;
public function getFamily(): ?int
{
return $this->family;
}
public function setFamily(int $family): void
{
if ($family < 0 || $family > 0xFFFF) {
throw new \DomainException(sprintf('Family must be an unsigned 16-bit integer. "%d" given.', $family));
}
$this->family = $family;
}
public function setSourceNetmask(int $sourceNetmask): void
{
if ($sourceNetmask < 0 || $sourceNetmask > 0xFF) {
throw new \DomainException(sprintf('Source Netmask must be an unsigned 8-bit integer. "%d" given.', $sourceNetmask));
}
$this->sourceNetmask = $sourceNetmask;
}
public function getSourceNetmask(): ?int
{
return $this->sourceNetmask;
}
public function setScopeNetmask(int $scopeNetmask): void
{
if ($scopeNetmask < 0 || $scopeNetmask > 0xFF) {
throw new \DomainException(sprintf('Scope Netmask must be an unsigned 8-bit integer. "%d" given.', $scopeNetmask));
}
$this->scopeNetmask = $scopeNetmask;
}
public function getScopeNetmask(): ?int
{
return $this->scopeNetmask;
}
public function setAddress(?string $address): void
{
$this->address = $address;
}
public function getAddress(): ?string
{
return $this->address;
}
public function toWire(): string
{
if (!isset($this->family) || !isset($this->sourceNetmask) || !isset($this->address)) {
throw new \InvalidArgumentException('Family, SourceNetmask, and Address must all be set.');
}
return pack('ncc', $this->family, $this->sourceNetmask, $this->scopeNetmask ?? 0).inet_pton($this->address);
}
public function fromWire(string $optionValue, int &$offset = 0, ?int $optionLength = null): void
{
$integers = unpack('nfamily/csourceNetmask/cscopeNetmask', $optionValue, $offset);
if (false === $integers) {
throw new DecodeException(self::NAME, $optionValue);
}
$offset += 4;
if (!in_array($integers['family'], [self::FAMILY_IPV4, self::FAMILY_IPV6])) {
throw new DecodeException(self::NAME, $optionValue);
}
if (self::FAMILY_IPV4 === $integers['family'] and ($integers['sourceNetmask'] > 32 or $integers['scopeNetmask'] > 32)) {
throw new DecodeException(self::NAME, $optionValue);
}
$addressLength = self::FAMILY_IPV4 === $integers['family'] ? 4 : 16;
$address = @inet_ntop(substr($optionValue, $offset, $addressLength));
if (false === $address) {
throw new DecodeException(self::NAME, $optionValue);
}
$offset += $addressLength;
$this->family = $integers['family'];
$this->sourceNetmask = $integers['sourceNetmask'];
$this->scopeNetmask = $integers['scopeNetmask'];
$this->address = $address;
}
}