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Re: [dnsoverhttp] Survey of DNS over HTTP

Ted Hardie <ted.ietf@gmail.com> Fri, 16 September 2016 16:29 UTC

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From: Ted Hardie <ted.ietf@gmail.com>
Date: Fri, 16 Sep 2016 09:29:17 -0700
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To: Martin Thomson <martin.thomson@gmail.com>
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Cc: Shane Kerr <shane@time-travellers.org>, dnsoverhttp@ietf.org
Subject: Re: [dnsoverhttp] Survey of DNS over HTTP
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Howdy,

On Fri, Sep 16, 2016 at 9:17 AM, Martin Thomson <martin.thomson@gmail.com>
wrote:

> On 16 September 2016 at 03:09, Shane Kerr <shane@time-travellers.org>
> wrote:
> >> GET  dns:[//authority/]domain[?CLASS=class;TYPE=type]
> >>
> >> (See RFC 4501 for the full set of permitted syntax for DNS URIs)
> >>
> >> and return either application/dns or text/dns records for the result
> (See
> >> RFC 4027 for the specification of the MIME types).
> >
> > I'm not sure that I understand the syntax. Can you give some examples?
>
> Ted is suggesting that you could construct a URI that entirely
> encapsulated a DNS request.  I'm not certain that that is possible,
> but it would be one way of constructing a protocol.
>
> For instance, a MX request might be formulated by sending a GET to
> dns:IN:MX:time-traveler.org
>
>
In the syntax of RFC 4501, this would dns:time-traveler.org?CLASS=IN;TYPE=MX


> (Personally, I'm inclined to drop IN from the protocol, but that's just
> me.)
>

It's a default in RFC 4501, so it doesn't need to be included:

dns:time-traveler.org?TYPE=MX

is equivalent.

There are some obscure bits of the DNS protocol you can't express in the
DNS URI scheme and return application/dns or text/dns, but it covers the
common ground pretty simply.

Ted

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