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1.8

    1: #! /bin/sh
    2: # $Id: iptables_init_and_clean.sh,v 1.1.1.2 2013/07/22 00:32:35 misho Exp $
    3: # Improved Miniupnpd iptables init script.
    4: # Checks for state of filter before doing anything..
    5: 
    6: EXTIF=eth0
    7: IPTABLES=/sbin/iptables
    8: EXTIP="`LC_ALL=C /sbin/ifconfig $EXTIF | grep 'inet ' | awk '{print $2}' | sed -e 's/.*://'`"
    9: NDIRTY="`LC_ALL=C /sbin/iptables -t nat -L -n | grep 'MINIUPNPD' | awk '{printf $1}'`"
   10: FDIRTY="`LC_ALL=C /sbin/iptables -t filter -L -n | grep 'MINIUPNPD' | awk '{printf $1}'`"
   11: echo "External IP = $EXTIP"
   12: 
   13: if [[ $NDIRTY = "MINIUPNPDChain" ]]; then
   14:         echo "Nat table dirty; Cleaning..."
   15:         $IPTABLES -t nat -F MINIUPNPD
   16: elif [[ $NDIRTY = "Chain" ]]; then
   17:         echo "Dirty NAT chain but no reference..? Fixsted."
   18:         $IPTABLES -t nat -A PREROUTING -d $EXTIP -i $EXTIF -j MINIUPNPD
   19:         $IPTABLES -t nat -F MINIUPNPD
   20: else
   21:         echo "NAT table clean..initalizing.."
   22:         $IPTABLES -t nat -N MINIUPNPD
   23:         $IPTABLES -t nat -A PREROUTING -d $EXTIP -i $EXTIF -j MINIUPNPD
   24: fi
   25: if [[ $FDIRTY = "MINIUPNPDChain" ]]; then
   26:         echo "Filter table dirty; Cleaning..."
   27:         $IPTABLES -t filter -F MINIUPNPD
   28: elif [[ $FDIRTY = "Chain" ]]; then
   29:         echo "Dirty filter chain but no reference..? Fixsted."
   30:         $IPTABLES -t filter -I FORWARD 4 -i $EXTIF ! -o $EXTIF -j MINIUPNPD
   31:         $IPTABLES -t filter -F MINIUPNPD
   32: else
   33:         echo "Filter table clean..initalizing.."
   34:         $IPTABLES -t filter -N MINIUPNPD
   35:         $IPTABLES -t filter -I FORWARD 4 -i $EXTIF ! -o $EXTIF -j MINIUPNPD
   36: fi
   37: