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Re: [RFC] Username/Password NSE library
From: Kris Katterjohn <katterjohn () gmail com>
Date: Wed, 25 Jun 2008 11:23:30 -0500

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Patrick Donnelly wrote:
On Wed, Jun 25, 2008 at 12:25 AM, Kris Katterjohn <katterjohn () gmail com> wrote:
My initial reactions:

* I mentioned the functionality of returning a table of usernames and
passwords, and the option of returning a table of only a certain size,

Like I said, you can modify usernames and passwords to return smaller
tables based on a parameter (e.g. unpwdb.usernames("short")).
Alternatively, you can modify the design to operate on an array (and
use ipairs()). The user could then break on the number he wants e.g.:

for i, user in unpwdb.usernames() do
  if i > 20 then break; end
  -- do stuff
end


I understand this, I was merely pointing out that the closure was the method
of choice.  I mentioned it initially[1], and nobody seemed to think that
returning a table was better[2][3].

But, like I said, if returning a table is now the desired functionality, then
your changes seem fine.

* The third return value from the functions, which tells the caller whether
we're using a user-defined list or not, is always nil in yours.

This is simply necessary for Lua's generic for loop and the next
function. I suggest alternate functions that return information about
it being a user-defined list and what not.


If returning the table is decided upon, then this makes sense (unless there is
a simpler way).

Aside from these, your changes seem to work fine after I modified my test
script to handle them.

Good to hear it.


I have run into one problem which I didn't test last night: giving the library
a non-existent filename.  Rather than returning false and giving the caller an
error message like mine did, or returning the error message like I assume
yours is supposed to do[4], I get this rather nasty looking error message:

SCRIPT ENGINE: error while initializing script rules:
./nselib/unpwdb.lua:29: bad argument #1 to 'lines' (none: No such file or
directory)
stack traceback:
        [C]: in function 'lines'
        ./nselib/unpwdb.lua:29: in main chunk
        [C]: in function 'require'
        ./scripts/unpwdbtest.nse:7: in main chunk
        [C]: ?
        [C]: ?


Cheers,


Thanks,
Kris Katterjohn

[1] http://seclists.org/nmap-dev/2008/q2/0740.html
[2] http://seclists.org/nmap-dev/2008/q2/0754.html
[3] http://seclists.org/nmap-dev/2008/q2/0757.html
[4] http://www.lua.org/manual/5.1/manual.html#pdf-error

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