NAME

       filtergen - packet filter compiler

SYNOPSIS

       filtergen  [  -h  |  --help  ]  [  -V  |  --version  ]  [  -c  | --compile ] [ -t target |
       --target=target ] [ -o outfile | --output=outfile ] infile

       filtergen [ -h | --help ] [  -V  |  --version  ]  [  -c  |  --compile  ]  [  -t  target  |
       --target=target ] [ -o outfile | --output=outfile ] [ -F policy | --flush=policy ]

DESCRIPTION

       filtergen  compiles  a  high-level filtering description language into a variety of target
       formats.

USAGE

       filtergen reads the ruleset from the infile specified on the  command  line  (or  standard
       input  if  infile  is  "-")  and outputs to standard output (or outfile) via an optionally
       specified backend.

       Both short and GNU-style long option options are accepted:

       -c, --compile
              Only try to "compile" the input, and do not  generate  any  output.   This  may  be
              useful  to  check that an input file has no syntax errors in it before one attempts
              to use the result on a live server.

       -t target-filter, --target=target-filter
              If specified, target-filter will be used to select an output filter type, otherwise
              the  default  of iptables will be used.  Supported backends are iptables, ipchains,
              ipfilter and cisco (for Cisco IOS access-lists).

       -F policy, --flush=policy
              Flush mode.  Generate a set of rules for clearing all rules from the packet filter.
              Useful for firewall scripts that need to `shutdown' the firewall.  You can supply a
              policy argument in place of the usual filename,  to  specify  whether  the  flushed
              filter  should  default  to  accept,  reject,  or  drop.   It  defaults  to accept,
              equivalent to having no filter loaded at all.  It is not necessary  to  specify  an
              infile when using flush mode.

       -o outfile, --output=outfile
              Write output to outfile instead of standard output.

       -h, --help
              Show command help.

       -V, --version
              Show program version.

BUGS

       Not all backends implement all features.

       The packet filter is not optimised.

SEE ALSO

       fgadm(8), filter_syntax(5), filter_backends(7)

AUTHOR

       filtergen    was    originally    written    by   Matthew   Kirkwood.    Jamie   Wilkinson
       <jaq@spacepants.org> then rewrote a lot of the internals, added some features, and took on
       maintenance of the project.

                                         January 7, 2004                             FILTERGEN(8)