This is hlfl.

hlfl stands for "High Level Firewall Language". It permits writing
firewalling rules using a high level language, and transforms them into
rules for real softwares, like ipfilter, ipchains or cisco rules.

You could make contact with the developers by subscribing to
<[email protected]>. There is also an announce ML at <[email protected]>.
These lists are managed by majordomo (write to <[email protected]> with
"help" in the body of your mail).