Re: config files

On 6/23/17 10:08 PM, Skip Carter wrote:
> I have a practical question about the lua config files:  What is the
> philosophy about what belongs in snort_defaults.lua vs snort_config.lua
> vs snort.lua ? They are 3 different files for some reason.
snort.lua is your main configuration file.  The default snort.lua is 
intentionally lean so that you can very easily see what is going on.

snort_defaults.lua is included in snort.lua to provide all the external 
defaults.  In particular, all lists are provided there. The gtp 
defaults, for example, span nearly 500 lines in snort_defaults.lua, and 
can be used with just one line in snort.lua like this:

     gtp_inspect = default_gtp

That is much easier to work with.  Note that simple types like integers 
and bools have internal defaults.  They can used like this:

     sip = { }

snort_config.lua is actually a library file that defines scripts used to 
load the configuration from Lua into C++.  That is a "set and forget" 
loaded with this line:

     require('snort_config')

You need that line in your top-level config files such as snort.lua.  
Beyond that, you can use any file arrangement you like, from putting 
everything into one file to putting everything into separate files.  
There is no right or wrong way as long as it does what you want.   The 
packaged snort.lua and snort_defaults.lua are one example that should 
make it easy for most folks to get started. In most cases, you should 
only need to tweak snort.lua.
>
> The command line is getting awfully busy, cant I put a lot of that in
> one of the lua scripts ?
Maybe.  Some things are only command line options though.  You can check 
the available configuration options with

     snort --help-config

to see what can go in a Lua file.  However, it is not uncommon to have 
complex Snort commands which are managed with bash scripts or whatever.
>
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