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#!/bin/sh
#
# manage iptables rules for the given port
#
[ $# -lt 1 ] && exit
action=$1
port=${2:-9929}
testip() {
local chain=$1
iptables -L $chain | grep -wq ^DROP.*$port
}
logcmd() {
logger -p local7.info "$*"
eval $*
}
case "$action" in
start)
logcmd iptables -D INPUT -p udp --dport $port -j DROP
logcmd iptables -D OUTPUT -p udp --dport $port -j DROP
logcmd iptables -D INPUT -p udp --sport $port -j DROP
logcmd iptables -D OUTPUT -p udp --sport $port -j DROP
;;
stop)
testip INPUT && {
echo "packets from/to $port already being dropped!"
exit
}
logcmd iptables -A INPUT -p udp --dport $port -j DROP
logcmd iptables -A OUTPUT -p udp --dport $port -j DROP
logcmd iptables -A INPUT -p udp --sport $port -j DROP
logcmd iptables -A OUTPUT -p udp --sport $port -j DROP
;;
esac
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