Feature Request for nselib/dns

[Eugene Alexeev <eugene.alexeev () gmail com>]

I'd like to suggest that either a debug message or some other notification
be added for connections that are refused.  For example this could be added
to the end of decodeFlags function as:

if flags.RC2 and flags.RC4 then stdnse.print_debug("The DNS request was
refused") end

I'm working on a DNS cache snooping NSE script and ran into a DNS server
that refuses to answer RD=0  queries.  As you can imagine for cache snooping
it would be very nice to know whether the server simply had no answers or
refused to answer your query.

Eugene
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