[dsc] Smart second-level-domain mapping

[Jerry Lundström]

Hi Klaus,

On 10/18/21 10:26 AM, Klaus Darilion wrote:
> 
> AFAIK the second-level and third-level domain mapping is purely based on the number of dots. Hence, in our statistics, the most attractive second level domain is "co.uk". Would it be possible to implement a "smart" second-level domain mapping which counts example.com and example.co.uk on the same level? For example using the https://publicsuffix.org/list/public_suffix_list.dat list?

Sure, maybe you could add a lookup table (txt) that make "co.uk" be
treated like a single label for example.

But it would have some performance impact since it would need to look
this up on every packet.

It would be fairly simple to add a config for that file, read it into a
hash and add a lookup in dns_message.c/dns_message_QnameToNld() when
counting dots.

I'm hoping that you (or anyone else) have time to implement this?

Because I don't right now.

Cheers,
Jerry