NSE Script: delete host from output

[Anton Konvalyuk <w.o.l.f.paradox () mail ru>]

 Hello everyone.

Here is the problem. I have a big number of DNS-servers and want to know which of them has recursion. For this I'm 
using dns-recursion. Then I parse report with 'state="open"' or 'open ' (.xml and .nmap correspondingly). But it gives 
DNS-servers with no recursion too.  To walk around it I added "then" action:

 -- parse response for dns flags
    if (bit.band(string.byte(result,3), 0x80) == 0x80
        and bit.band(string.byte(result,4), 0x85) == 0x80)
    then
        return "Recursion appears to be enabled"
    else
        nmap.set_port_state(host, port, "close")
    end

But it looks weird.  So, could anyone tell if there is a method to simply delete host from output?


-- 
Best regars,
Anton Konvalyuk
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