Date: Fri, 1 Dec 2006 20:03:15 +1100 (EST) From: Ian Smith <smithi@nimnet.asn.au> To: "Dan Mahoney, System Admin" <danm@prime.gushi.org> Cc: freebsd-questions@freebsd.org Subject: (no subject) Message-ID: <Pine.BSF.3.96.1061201192537.16744A-100000@gaia.nimnet.asn.au> In-Reply-To: <20061129203900.7B1E016A4FE@hub.freebsd.org>
next in thread | previous in thread | raw e-mail | index | archive | help
Bit late, catching up on half a dozen questions-digests, but fwiw:
Re: freebsd-questions Digest, Vol 157, Issue 26
> Message: 33
> Date: Wed, 29 Nov 2006 14:55:52 -0500 (EST)
> From: "Dan Mahoney, System Admin" <danm@prime.gushi.org>
> Hey all, the ipfw man page says rules can be deleted individually or in
> groups, but I don't see (other than the sets) an easy way to craft
> deletion of rules in a range (for example, 500-550).
>
> As the system I'm using crafts client rules by client numbers, this is a
> kinda useful feature, is it available somewhere?
Here's one of a number of scripts I wrote to manage client-group based
rules for ipfw1 (before sets), to do just that; 'scuse debugging noise.
#!/bin/sh
# ipfwdelrange.sh 28/1/4 smithi optionally noisy for starters ..
version="1.0 28Jan04"
rulelist='/tmp/ipfwdelrange.rn'
set=''; q=''; v=''
[ "$1" = "-q" ] && q=y && shift # quiet
[ "$1" = "-v" ] && v=y && shift # verbose
[ ! "$q" ] && echo -n "ipfwdelrange.sh: "
[ $# -ne 2 ] && echo "usage: $0 [-q|-v] firstrule lastrule" && exit 1
/sbin/ipfw list | awk '{print $1}' >$rulelist # existing rulenumbers
[ $? -ne 0 ] && echo "'ipfw list' failed!" && exit 1
while read rule; do # find any existing ipfw rules within range
[ $rule -lt $1 ] && continue
[ $rule -gt $2 -o $rule -eq 65535 ] && break
set="$set $rule" # includes duplicates; each must be deleted
done <$rulelist
if [ "$set" ]; then
[ ! "$q" ] && echo "deleting all rules in range ${1}-$2"
[ "$v" ] && echo "$set"
/sbin/ipfw -q delete $set # delete all existing in range
[ $? -ne 0 ] && echo "'ipfw delete' failed!" && exit 1
else
[ ! "$q" ] && echo "no ipfw rules to delete in range ${1}-$2"
fi
[ -f $rulelist ] && rm $rulelist
exit 0
I seem to recall ipfw2 deletes multiple rules with the same number with
one delete statement. If that's the case, and you use any, make it:
[ ! "`echo $set | grep $rule`" ] && set="$set $rule"
or you'll get error messages on repeated deletes of the same rule.
Cheers, Ian
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?Pine.BSF.3.96.1061201192537.16744A-100000>