something to trace lookup recursion?

[Barry Margolin]

In article <388CD6B9.5A1C4E0B at daimlerchrysler.com>,
Kevin Darcy  <kcd at daimlerchrysler.com> wrote:
>Phil Howard wrote:
>
>> I'm looking for a way to, starting from the top, perform a recursive lookup
>> of a name, going all the way to authoritative records (A, MX, and PTR, in
>> particular), with a trace log of every step along the way.  For most things
>> this would list the root servers, and the ISP DNS servers, and finally the
>> data.  But it would need to handle whatever situation there might be, even
>> CNAME references.  The big thing is I need to extract a list of all the DNS
>> servers that are involved in the given name, and a little bit of information
>> about them (what level and what role).
>>
>> My guess is that I could do this with "dig" by applying a script around it,
>> specifying +norecurse so the servers don't do anything extra for me that I
>> don't know about, and just following through the NS and CNAME records in the
>> appropriate way (for other reasons I only need to follow one NS record when
>> there are usually more than one).
>>
>> Before I delve into the design of such a thing, which would involve parsing
>> the zone data from "dig", I thought it best to ask first so as to avoid
>> re-inventing the wheel.
>>
>> Has anything like this already been done?
>
>Sorry, I haven't done anything like this.

I think the above is a pretty fair description of doc, which can be found
in the contrib directory that comes with BIND.

-- 
Barry Margolin, barmar at bbnplanet.com
GTE Internetworking, Powered by BBN, Burlington, MA
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