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Date: Thu, 6 Nov 2014 14:55:06 +0200
Message-ID: <CAPhkiZwxSSSPZYNq0uS7y5-2ifSZadqyh7yt96ba60Y91fLKwQ@mail.gmail.com>
To: =?UTF-8?Q?K=C3=A9vin_Dunglas?= <dunglas@gmail.com>
Cc: Daniel Ribeiro <drgomesp@gmail.com>, PHP Internals <internals@lists.php.net>
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Subject: Re: [PHP-DEV] Better RFC conformance for FILTER_VALIDATE_URL
From: narf@devilix.net (Andrey Andreev)

Hi,

On Thu, Nov 6, 2014 at 8:19 AM, K=C3=A9vin Dunglas <dunglas@gmail.com> wrot=
e:
> Hi Andrey,
>
> Sorry but I think you're wrong. Domain !=3D hostname. Underscore are allo=
wed
> in domains (RFC 2181) but not in hostnames (RFC 1123 and next). To quote
> Wikipedia:
>
> "While a hostname may not contain other characters, such as the underscor=
e
> character (_), other DNS names may contain the underscore. Systems such
> asDomainKeys and service records use the underscore as a means to assure
> that their special character is not confused with hostnames. For
> example,_http._sctp.www.example.com specifies a service pointer for an SC=
TP
> capable webserver host (www) in the domain example.com."
> http://en.wikipedia.org/wiki/Hostname#Restrictions_on_valid_host_names
>
> You can also see this StackOverflow answer
> http://stackoverflow.com/a/2183140/1352334

I agree to an extent, but that is highly contextual.

Who said that 'domain' =3D=3D=3D 'DNS record' (which is a very broad term
anyway)? And IF we assume this, why do you need FILTER_VALIDATE_DOMAIN
for it if it's only going to check length?

Cheers,
Andrey.