[Bug 1458] Consider allowing for variable interpolation

[bugzilla-daemon at netfilter.org]

https://bugzilla.netfilter.org/show_bug.cgi?id=1458

Pablo Neira Ayuso <pablo at netfilter.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED

--- Comment #1 from Pablo Neira Ayuso <pablo at netfilter.org> ---
(In reply to kfm from comment #0)
> This is another feature request extracted from bug 1434 (the "usability"
> bug). Currently, variable interpolation isn't supported by the parser. The
> originally given example was as follows.
> 
>   define LOG_PREFIX = "[foo] "
>   table inet filter {
>     chain input {
>       type filter hook input priority 0; policy drop;
>       counter log prefix "$LOG_PREFIX DROP"
>     }
>   }

commit e76bb379401816bbea773e73b524cd747324760a
Author: Pablo Neira Ayuso <pablo at netfilter.org>
Date:   Tue Jul 7 17:42:37 2020 +0200

    src: allow for variables in the log prefix string

    For example:

     define test = "state"
     define foo = "match"

     table x {
            chain y {
                    ct state invalid log prefix "invalid $test $foo:"
            }
     }

> If this is ever implemented, it might also make sense to allow for strings
> to be single-quoted so as to be able to suppress expansion (just like in
> sh). Otherwise, there would need to be some means of escaping the $ symbol.
>
> Another approach could be so support a concatenation operator instead. For
> instance:
> 
>   counter log prefix $LOG_PREFIX + " DROP"

For the record: These last two items are not implemented.

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