[Pdns-users] DNS names and strings (was: PowerDNS development plans: 4.x DNSSEC, C++ 2011!)

2015-02-23 Thread Michael Ströder 
bert hubert wrote:
 In this post, we’d like to share our current plans for .. PowerDNS 4.x!

Glad to read all your plans.

* We treat DNS names as ASCII strings, which we escape and unescape
  repeatedly.  DNS names are not ascii strings, and we keep finding
  issues related to us treating them like strings.

Unfortunately the term string is used in many different ways.
Could you please elaborate on what that means exactly?
E.g. will this affect the way NON-ASCII DNS names are stored in backend files?

Ciao, Michael.



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Re: [Pdns-users] DNS names and strings (was: PowerDNS development plans: 4.x DNSSEC, C++ 2011!)

2015-02-23 Thread bert hubert 
On Mon, Feb 23, 2015 at 12:44:54PM -0600, Nicholas Williams wrote:
 I'm also very interested in finding out more about the change around ASCII
 names.

I can recommend our ever growing set of test cases:
https://github.com/ahupowerdns/pdns/blob/dnsname/pdns/test-dnsname_cc.cc

DNS, surprisingly, is 8-bit clean. You can put any stream of octets in DNS
(up to a certain length). However, this is not how we print it.

http://www.ietf.org/rfc/rfc4343.txt has some words on this.

  Unfortunately the term string is used in many different ways.
  Could you please elaborate on what that means exactly?
  E.g. will this affect the way NON-ASCII DNS names are stored in backend
  files?

No, it is not intended to make any changes, except for where we got it
wrong.

Wr internally have loads of places where we convert to and from (un)escaped
versions, add dots, remove dots etc. We get it wrong in some places now.

Bert


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