Re: [netmod] 6991bis: host

[Juergen Schoenwaelder <[e-mail]>]

Lada,

the definition of inet:domain-name already has text that Internet host
names have a stricter syntax. Perhaps we should simply state
explicitely in the definition of host that the stricter rules apply?

I understand that you want to capture more in the definition itself.
Perhaps this makes sense and is backwards compatible (for
implementations that followed the advice in the descriptin of
inet:domain-name).

/js

On Fri, Mar 29, 2019 at 03:29:05PM +0100, Ladislav Lhotka wrote:
> Hi,
> 
> the inet:host type should not use the inet:domain-name as its member because the
> latter type doesn't satisfy the requirements of RFC 952 and 1123 on host names.
> For example, the type now permits a single dot (".") as the value or the
> underscore character.
> 
> I propose to change the "host" type as follows:
> 
> OLD
> 
>     typedef host {
>       type union {
>         type inet:ip-address;
>         type inet:domain-name;
>       }
>       ...
>     }
> 
> NEW
> 
>     typedef host {
>       type union {
>         type inet:ip-address;
>         type inet:host-name;
>       }
>       ...
>     }
> 
> A reasonable definition of "host-name" is IMO a domain name whose labels are NR-
> LDH (non-registered letter-digit-hyphen label) [RFC 5890]:
> 
>     typedef host-name {
>       type string {
>         pattern
>           '((([a-zA-Z0-9]([a-zA-Z0-9\-]){0,61})?[a-zA-Z0-9]\.)*'
>         + '([a-zA-Z0-9]([a-zA-Z0-9\-]){0,61})?[a-zA-Z0-9]\.?)';
>         pattern '(.*\.)?..\-\-.*' {
>           modifier invert-match;
>         }
>         length "2..253";
>         ...
>       }
>     }
> 
> Lada
> 
> -- 
> Ladislav Lhotka
> Head, CZ.NIC Labs
> PGP Key ID: 0xB8F92B08A9F76C67
> 
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-- 
Juergen Schoenwaelder           Jacobs University Bremen gGmbH
Phone: [phone]         Campus Ring 1 | 28759 Bremen | Germany
Fax:   [phone]         <https://www.jacobs-university.de/>