#!/bin/sh
#
# DHCP
#
# The 1:st rule is when the client makes a broadcast to ask for a setup.
# The 2:nd rule is when the client has got the IP number but still doesn't
# know the DHCP server's IP number.
# The 3:rd rule is when the client downloads extra info from the DHCP server.
#
# The BOOTP/DHCP RFCs can describe this in greater detail.
#

source /filter/fw.conf
echo "$0"

ARG=$1
if [ ${1:-none} = "none" ]; then
    ARG="refresh"
    ipchains -F dhcp
else
    if [ $ARG != "refresh" -a $ARG != "purge" -a $ARG != "delete" ]; then
        echo
        echo "Usage:   $0 <refresh|purge|delete>"
        echo "Example: $0 refresh    (default)"
        echo
        exit
    fi
fi
case $ARG in ( refresh ) ACTION="-A"; ipchains -F dhcp;;
             ( purge )   ACTION="-D";;
             ( delete )  ACTION="-D"; ipchains -F dhcp; exit;;
esac

###------- Edit Rules Below -------###

# FORWARD input in
ipchains $ACTION dhcp -p UDP -i $IF_IP2 -s $ALL_ZEROS bootpc -d $ALL_ONES bootps -j ACCEPT
ipchains $ACTION dhcp -p UDP -i $IF_IP2 -s $NET_IP2 bootpc -d $ALL_ONES bootps -j ACCEPT
ipchains $ACTION dhcp -p UDP -i $IF_IP2 -s $NET_IP2 bootpc -d $IP2 bootps -j ACCEPT