[Ferm] adding to a list

[Marc Haber]

I am talking to myself:
> something like
> 
> @def $l_backexec_clients=($l_backexec_clients $host);
> 
> is becoming a rather common idiom in my ferm rules, when I add a
> host's IP address to a list of hosts that is processed in a later rule.
> 
> How would I write a function that would allow me to write
> 
> @add_to_backexec_clients($host);
> 
> or
> 
> @add_to_list($l_backexec_clients,$host);

 1   @def $l=();
 2   @def $l=($l 192.0.2.1);
 3   @def $l=($l 192.0.2.10.);
 4   
 5   @def &add_l($ip) = {
 6     @def $l=($l $ip);
 7   }
 8     
 9   @add_l(192.0.2.20);
10     
11   @def &add_to_list($list,$ip) = {
12     @def $list=($list $ip);
13   }
14   
15   &add_to_list($l,192.0.2.30);
16   
17   chain OUTPUT daddr $l ACCEPT;

The first variant starting at line 5 simply doesn't work. I guess that
the @def on line 6 defines a new $l that is only valid inside the
function.

The second variant, starting at line 11, gives a syntax error once
line 15 is present.

Is it possible to do what I want to do?

Greetings
Marc

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