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Concise IP check

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This commit is contained in:
Aaron Piotrowski 2023-01-11 18:00:59 -06:00
parent 7344cceb95
commit ce71845dd1
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GPG Key ID: 5B456E6AABA44A63
1 changed files with 13 additions and 27 deletions
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40
src/Rfc1035StubDnsResolver.php
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@ -108,38 +108,24 @@ final class Rfc1035StubDnsResolver implements DnsResolver
return $this->blockingFallbackResolver->resolve($name, $typeRestriction, $cancellation);
}
switch ($typeRestriction) {
case DnsRecord::A:
if (\filter_var($name, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4)) {
return [new DnsRecord($name, DnsRecord::A, null)];
}
// Check if provided $name is an IP address.
$isIp = \array_filter([
DnsRecord::A => \filter_var($name, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4),
DnsRecord::AAAA => \filter_var($name, FILTER_VALIDATE_IP, FILTER_FLAG_IPV6),
]);
if (\filter_var($name, FILTER_VALIDATE_IP, FILTER_FLAG_IPV6)) {
throw new DnsException("Got an IPv6 address, but type is restricted to IPv4");
}
break;
case DnsRecord::AAAA:
if (\filter_var($name, FILTER_VALIDATE_IP, FILTER_FLAG_IPV6)) {
return [new DnsRecord($name, DnsRecord::AAAA, null)];
}
// If the name is an IP address, return that IP (or throw if it does match the type restriction).
if ($isIp) {
$type = \array_key_first($isIp);
if (!\in_array($type, $recordTypes, true)) {
throw new DnsException("Got an IP address that is not valid for the restricted record type");
}
if (\filter_var($name, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4)) {
throw new DnsException("Got an IPv4 address, but type is restricted to IPv6");
}
break;
default:
if (\filter_var($name, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4)) {
return [new DnsRecord($name, DnsRecord::A, null)];
}
if (\filter_var($name, FILTER_VALIDATE_IP, FILTER_FLAG_IPV6)) {
return [new DnsRecord($name, DnsRecord::AAAA, null)];
}
break;
return [new DnsRecord($name, $type, null)];
}
$dots = \substr_count($name, ".");
$trailingDot = $name[-1] === ".";
$trailingDot = $name !== '' && $name[-1] === ".";
$name = normalizeName($name);
if ($records = $this->queryHosts($name, $typeRestriction)) {