Re: [NSE] Script Arguments with Environment Variables

[Patrick Donnelly <batrick () batbytes com>]

On Thu, Jun 3, 2010 at 8:57 AM, Patrick Donnelly <batrick () batbytes com> wrote:
> Hi nmap-dev,
>
> From a conversation in #nmap (on Freenode), a user decided to manually
> change the user agent in the NSE http library so he wouldn't have to
> add a script argument for every nmap invocation. I was thinking it
> would be useful to have an environment variable (maybe
> NMAP_SCRIPTARGS) that the user could set in their startup scripts so
> changing the libraries/scripts is no longer necessary. What do you all
> think?

Here's a simple diff that implements this:

<patch>
batrick@batbytes:~/nmap/svn/nmap$ svn diff
Index: nse_main.lua
===================================================================
--- nse_main.lua        (revision 17916)
+++ nse_main.lua        (working copy)
@@ -69,6 +69,8 @@

 local max = math.max;

+local getenv = os.getenv;
+
 local byte = string.byte;
 local find = string.find;
 local format = string.format;
@@ -759,7 +761,8 @@
       end
     end
   end
-  nmap.registry.args = parse_table("{"..args.."}", 1);
+  nmap.registry.args = setmetatable(parse_table("{"..args.."}", 1),
+      {__index = parse_table("{"..getenv("NMAP_SCRIPTARGS").."}", 1)});
 end

 -- Load all user chosen scripts
</patch>

Arguments given on the command line are given precedence over the
arguments given in the NMAP_SCRIPTARGS environment variable.

-- 
- Patrick Donnelly
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