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On 16/06/09 15:46, W.C.A. Wijngaards wrote:
> Or, well, whatever the operator configured, see the unbound options
> 'version' and 'hide-version'.
Indeed, I thought that went without saying.
> Perhaps you want this piece of python? :
> (cin, cout) = os.popen2("dig @" + dnsserver + " version.bind chaos txt")
> result = cout.readlines()
> cin.close()
> cout.close()
> print result
I specifically wanted to use a library for this because spawning dig is
inefficient, which makes a big difference when you are looking up a few
million records :-) Also, dig has the nasty habit of stalling when it
gets stuck trying to locate the dns name. Although you can specify
+tries=1 and +timeout=1, it still blocks whilst resolving the A/AAAA
address of the target dns name (for example, if the target is
ns1.something.example.com., and the two dns servers for
something.example.com. are unavailable, it will hang for a lot longer
than 2 seconds).
I have looked at several libraries for this, and so far none have met
all my needs (multiple target servers, IPv6, chaos and asynchronous),
and from your reply I can only infer that Unbound will not be suitable
either :-( Back to the drawing board! Thanks for your replies.
Regards,
Chris
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