IDNA 2008 Question Re: "Confusable" Characters in Domain Names
Andrew Sullivan
ajs at shinkuro.com
Fri Nov 5 22:17:11 CET 2010
On Thu, Nov 04, 2010 at 08:40:47PM +0000, Shawn Steele wrote:
> I’d like to throw in my 2 cents. Clearly a browser has no clue if
> the DNS layer is operating under IDNA2003 or IDNA2008 rules
I have no idea what this would me. The DNS layer is not operating
under _either_ IDNA2003 or IDNA2008 rules. It's operating like it
always did: it matches labels, one label at a time, and it matches
them exactly, bit for bit. Moreover, under IDNA of any flavour, it
does that under the constraint of the old-fashioned hostname rules
(which means, roughly, letters, digits, hyphen or LDH).
> IMO it’s not the client’s responsibility to say whether DNS rules
> are being followed, but rather the DNS layer’s responsibility to
> correctly resolve names and provide the appropriate errors when the
> name isn’t valid.
The rules _are not_ DNS rules, and if that isn't perfectly clear from
reading IDNA2008, I have no idea how to make it more so.
A
--
Andrew Sullivan
ajs at shinkuro.com
Shinkuro, Inc.
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