When using IDN domain names, it is easy to reach the limit and throw exception Regex::DOMAIN_OR_SUBDOMAIN

[xiaohuilam]

dns/src/Handlers/AbstractDnsHandler.php

Lines 98 to 103 in 92208ec

	if (!preg_match(Regex::DOMAIN_OR_SUBDOMAIN, $hostName)) {
	throw new DnsHandlerException(
	$hostnameErrorInfo . ' format! (characters "A-Za-z0-9.-", max length 63 chars allowed)',
	DnsHandlerException::HOSTNAME_FORMAT_INVALID
	);
	}

[bluelibraries]

Thank you very much for notifying.
Let's increase it to 255.
What do you think?

[bluelibraries]

I'm on it.

[xiaohuilam]

Thank you very much for notifying. Let's increase it to 255. What do you think?

Perhaps okay, but why there's a limitation for hostname length?

[james2001]

Hello

This domain is valide xn--c1aafynu.xn--c1avg.xn--p1acf, but the regex doesn't match
because the xn part is not in the TDL -> ^(([\w\d_-]+){1,63}.)+([\w\d_-]+){2,63}$

Why the lib, don't use https://www.php.net/manual/en/filter.filters.validate.php

[james2001]

@xiaohuilam can you test #3 ?

[xiaohuilam]

@xiaohuilam can you test #3 ?

@james2001 I think this is better.

filter_var($hostName, FILTER_VALIDATE_DOMAIN)

because it will return false if $hostName = '_dnsauth.test.com' in your code:

$hostName = '_dnsauth.test.com';
var_dump(filter_var($hostName, FILTER_VALIDATE_DOMAIN, FILTER_FLAG_HOSTNAME)); // it returns `false`, and unexpected.

_dnsauth is digicert's domain validation hostname prefix, it's allowed to be created as dns host for mostly dns service providers.

and, please mention @bluelibraries for more review because he is the owner of this repository.