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Re: NSE console script help
From: Martin Holst Swende <martin () swende se>
Date: Tue, 18 Jan 2011 20:27:10 +0100

On 01/18/2011 09:50 AM, Fyodor wrote:
On Mon, Jan 17, 2011 at 08:49:34PM +0100, Martin Holst Swende wrote:
Reposting this which I posted earlier ([1], [2]), perhaps with a bad
subject-line, since there was no response.
Thanks for reposting.  I agree with others that this could be a
worthwhile feature.  I think using --script-args to implement this
works great as a proof-of-concept, but I agree with David that it
probably isn't perfect as a final implementation.  
Yep, agree.

Maybe there could
be a new option like --script-help which takes a script specifier
(i.e. a script name or category or expression--the same arguments as
--script itself takes).  Then it could print help information for all
the matching scripts.  Ideally, I think Nmap should do no actual
scanning when executed this way (e.g. "nmap --script-help default").
I don't really agree there. What you are describing is kind of a
'man-page' system for
scripts and script categories - which, as I see it, is *one* feature of
this new
help-system which should definitely be there - but there is another
feature which is
even more neat, and that is the fact that it by default gives relevant
information only.

Also, I didn't know it myself until I tested it yesterday when David
asked, but it actually already works as
a man-page without doing scans. This works (although I haven't looked up
why):
nmap --script=intrusive --script-args help

If I use: "nmap foobar.com  --script=all --script-args=help", lets say
nmap discovers the
for me totally unknown service "gazonk". Perhaps there is a very
uncommon script which is
a bit intrusive, and not default, written specifically for the gazonk
service.
The chances of me finding that script are small, normally, but since the
command above will
print only[1] the help about that particular script, I will have a
higher chance of finding the right
script for the task.

[1] Actually, it will print help about the broadcast-scripts also, which
don't requrie a certain port or service

To make it even more useful, as I see it, would be if I was able to
say:"nmap foobar.com --script=!default --script-args=help", i.e,
"tell me about the scripts that I have the option to run here, but which
for some reason are not default". Perhaps this can
already be done?

I do like the idea to move it into a separate argument. Something like
nmap --script-help=intrusive (currently: nmap --script=intrusive
--script-args help) <= No scan, print info about "intrusive"-category
nmap foobar.com --script-help=all (currently: nmap foobar.com 
--script=all --script-args=help) <= Scan, print info about
scripts-to-execute in "all"-category


I also agree that it might be nice for Zenmap to use this standard
script-help mechanism.  Maybe it could print the information in XML or
something to the -oX stream.
Definitely. I would prefer to add something to stdnse.format_output
which makes stdnse print it as XML instead. By doing it that way, I
think a lot of other scripts could easily be ported aswell.

It would probably be good to separate the "--script-args force" part
into a separate patch, since that is a completely different feature.
Agree.
I tried to read your new nse_main.lua from the Seclists archive at
http://seclists.org/nmap-dev/2010/q4/att-567/nse_main_lua.bin.  But I
was a bit annoyed that Firefox only lets me download the Lua file
rather than offering the choice of viewing it as text in the browser
window.  It turns out that there has been a firefox "bug" (enhancement
request) for this feature for more than 10 years, but it hasn't been
implemented yet.  The good news is that I found a plugin which let's
you choose to view unhandled MIME types as text or HTML or an image or
basically whatever you want.  It seems to be working well for me so
far:

https://addons.mozilla.org/en-US/firefox/addon/open-in-browser/

Regarding the Script help output, I suppose it might be best to
comma-separate the categories and list them on one line so instead of
three lines you have:

Categories: default, safe
Sure
Also, regarding these two lines:

  NSE: ------------- Script help -------------
    http-methods.nse

I'll bet you could combine them.  Maybe something like:

  NSE: ------ Script Help: http-methods.nse ------

Yep.
Cheers,
Fyodor

Cheers!
/Martin
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