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Re: [NSE] DNS update support
From: David Fifield <david () bamsoftware com>
Date: Thu, 13 Jan 2011 20:12:03 -0800

On Tue, Jan 11, 2011 at 08:01:08AM +0100, Patrik Karlsson wrote:

On 10 jan 2011, at 02.58, David Fifield wrote:

On Mon, Jan 10, 2011 at 02:15:45AM +0100, Patrik Karlsson wrote:
Hi all,

I just finished some work on the DNS library adding support for unauthenticated dynamic updates.
I'm including a patch that adds the support and a script dns-update that makes us of it.

The script attempt to add a record specified as an argument and returns a message if it was successful.
Any comments or feedback are always appreciated.

I get this error:

./nmap --datadir . --script=dns-update -d 192.168.0.1 -sU -p53 --script-args 
dns-update.hostname=foo,dns-update.ip=3.3.3.3

./nselib/dns.lua:708: attempt to concatenate a nil value
stack traceback:
       ./nselib/dns.lua:708: in function <./nselib/dns.lua:704>
       (tail call): ?
       ./nselib/dns.lua:775: in function 'encode'
       ./nselib/dns.lua:1254: in function 'update'
       ./scripts/dns-update.nse:53: in function <./scripts/dns-update.nse:46>
       (tail call): ?

With "foo.bar.com" instead of "foo", the script finishes but doesn't
make any output.

Sorry my bad. I fixed the error by making some additional checks.
The script produces no output unless the DNS update is successful.
Do you think the script should produce a message similar to "Dynamic update of record nmap-test.cqure.net failed" on 
failure as well?

No, I think no output is fine.

I'm including an updated script and a new patch file for dns.lua.

Looks good, please commit.

David Fifield
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