Date: Sun, 12 Jan 2003 17:05:59 +0100 From: "Simon L. Nielsen" <simon@nitro.dk> To: "Scott M. Nolde" <scott@smnolde.com> Cc: freebsd-ipfw@freebsd.org Subject: Re: Feature Request Message-ID: <20030112160558.GE348@nitro.dk> In-Reply-To: <20030108145020.GA15778@smnolde.com> References: <20030108145020.GA15778@smnolde.com>
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On 2003.01.08 09:50:20 +0000, Scott M. Nolde wrote:
> Has there been consideration to make a "relative skip" function similar to
> skipto, where the number of rules are skipped relative to the rule itself?
I found this could be useful so I have implemented this in my own firewall
script to get the functionality like this :
fwcmd_add deny ip from 10.0.0.0/8 to any
fwcmd_add skipto ${rule_skip_1} ip from 192.168.1.0/24 to any
fwcmd_add deny ip from 192.168.0.0/16 to any
fwcmd_add count ip from any to any
When run this gives :
add 500 deny ip from 10.0.0.0/8 to any
add 510 skipto 530 ip from 192.168.1.0/24 to any
add 520 deny ip from 192.168.0.0/16 to any
add 530 count ip from any to any
It is not perfect but it works...
The implemetation is not complete yet but you can get the idea :
is_num() {
expr "$*" + 1 >/dev/null 2>&1
return $?
}
rule_first=500
rule_inc=10 # How much to inc pr rule
rule_next=${rule_first} # The next rule to use
# Add a firewall rule
fwcmd_add() {
# Check if we have a rule number
if is_num "$1"; then
rule_next=$1
shift
fi
${fwcmd} add ${rule_next} $@
rule_next=$((${rule_next} + ${rule_inc}))
# Note the are a bit odd since they are used by the next rule
# Warning: These will FAIL if an absoule rule nr is used in one of
# the rules before the one being skipped to
rule_skip_1=$((${rule_next} + ${rule_inc} * 2))
rule_skip_2=$((${rule_next} + ${rule_inc} * 3))
rule_skip_3=$((${rule_next} + ${rule_inc} * 4))
}
--
Simon L. Nielsen
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