__ __ __ __ _____ _ _ _____ _ _ _
| \/ | \ \ / / | __ \ (_) | | / ____| | | | |
| \ / |_ __\ V / | |__) | __ ___ ____ _| |_ ___ | (___ | |__ ___| | |
| |\/| | '__|> < | ___/ '__| \ \ / / _` | __/ _ \ \___ \| '_ \ / _ \ | |
| | | | |_ / . \ | | | | | |\ V / (_| | || __/ ____) | | | | __/ | |
|_| |_|_(_)_/ \_\ |_| |_| |_| \_/ \__,_|\__\___| |_____/|_| |_|\___V 2.1
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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;
use Badcow\DNS\Parser\Tokens;
use Badcow\DNS\Rdata\AAAA;
use Badcow\DNS\Rdata\CNAME;
use Badcow\DNS\Rdata\DNAME;
use Badcow\DNS\Rdata\MX;
use Badcow\DNS\Rdata\NS;
use Badcow\DNS\Rdata\PTR;
use Badcow\DNS\Rdata\RdataInterface;
use Badcow\DNS\Rdata\SOA;
use Badcow\DNS\Rdata\SRV;
class ZoneBuilder
{
/**
* Mapping of Rdata types to functions that fill them out.
*
* @var callable[]
*/
private static $rdataFillers = [
SOA::TYPE => __CLASS__.'::fillOutSoa',
CNAME::TYPE => __CLASS__.'::fillOutCname',
DNAME::TYPE => __CLASS__.'::fillOutCname',
SRV::TYPE => __CLASS__.'::fillOutSrv',
NS::TYPE => __CLASS__.'::fillOutCname',
PTR::TYPE => __CLASS__.'::fillOutCname',
MX::TYPE => __CLASS__.'::fillOutMx',
AAAA::TYPE => __CLASS__.'::fillOutAaaa',
];
public static function build(Zone $zone): string
{
$master = '$ORIGIN '.$zone->getName().Tokens::LINE_FEED;
if (null !== $zone->getDefaultTtl()) {
$master .= '$TTL '.$zone->getDefaultTtl().Tokens::LINE_FEED;
}
foreach ($zone as $rr) {
if (null !== $rr->getRdata()) {
$master .= preg_replace('/\s+/', ' ', trim(sprintf(
'%s %s %s %s %s',
$rr->getName(),
$rr->getTtl(),
$rr->getClass(),
$rr->getType(),
$rr->getRdata()->toText()
)));
}
if (null !== $rr->getComment()) {
$master .= Tokens::SEMICOLON.Tokens::SPACE.$rr->getComment();
}
$master .= Tokens::LINE_FEED;
}
return $master;
}
/**
* Fills out all of the data of each resource record. The function will add the parent domain to all non-qualified
* sub-domains, replace '@' with the zone name, ensure the class and TTL are on each record.
*/
public static function fillOutZone(Zone $zone): void
{
$class = $zone->getClass();
foreach ($zone as &$rr) {
$rr->setName(self::fullyQualify($rr->getName(), $zone->getName()));
$rr->setTtl($rr->getTtl() ?? $zone->getDefaultTtl());
$rr->setClass($class);
static::fillOutRdata($rr->getRdata(), $zone);
}
}
/**
* Add the parent domain to the sub-domain if the sub-domain if it is not fully qualified.
*/
protected static function fullyQualify(?string $subDomain, string $parent): string
{
if ('@' === $subDomain || null === $subDomain) {
return $parent;
}
if ('.' !== substr($subDomain, -1, 1)) {
return $subDomain.'.'.$parent;
}
return $subDomain;
}
protected static function fillOutRdata(RdataInterface $rdata, Zone $zone): void
{
if (array_key_exists($rdata->getType(), self::$rdataFillers)) {
call_user_func(self::$rdataFillers[$rdata->getType()], $rdata, $zone);
}
}
protected static function fillOutSoa(SOA $rdata, Zone $zone): void
{
$rdata->setMname(self::fullyQualify($rdata->getMname(), $zone->getName()));
$rdata->setRname(self::fullyQualify($rdata->getRname(), $zone->getName()));
}
protected static function fillOutCname(Cname $rdata, Zone $zone): void
{
$rdata->setTarget(self::fullyQualify($rdata->getTarget(), $zone->getName()));
}
protected static function fillOutSrv(SRV $rdata, Zone $zone): void
{
$rdata->setTarget(self::fullyQualify($rdata->getTarget(), $zone->getName()));
}
protected static function fillOutMx(MX $rdata, Zone $zone): void
{
$rdata->setExchange(self::fullyQualify($rdata->getExchange(), $zone->getName()));
}
protected static function fillOutAaaa(AAAA $rdata): void
{
$rdata->setAddress(PTR::expandIpv6($rdata->getAddress() ?? ''));
}
}