#!/bin/bash
#
#!F:delip4routes
#
#!P:/usr/local/sbin
#
#!D:Deletes all IPv4 routes through a specified interface
#
#!C:Copyright 1997-1998 Peter Bieringer <pb@bieringer.de>
#
#!V:Version 1.04 18.07.1998

# Changes to
#  1.01: info display
#  1.02: net-tools-980126 correction (route won't display U)
#  1.03: minor revision
#  1.04: remove net-tools-980126 correction (now obsolete)

# Here a shortcut to "route"
ROUTE="/sbin/route -n -A inet"

## Subroutines

# Display information
info() {
  grep "^#!D" $0 | awk -F: '{ print $2}'
  grep "^#!C" $0 | awk -F: '{ print " " $2}'
  grep "^#!V" $0 | awk -F: '{ print " " $2}'
  echo
}

# Help subroutine
help() {
	echo
	echo " Usage: $0 interface"
	return
}

## Start

info

DEVNAME=$1
if [ "$DEVNAME" = "" ]; then
	echo " No interface name is given - stop!"
	help
	exit 1
fi;

echo " You specified interface '$DEVNAME'"

# Get routes and delete the ones which matches $DEVNAME
$ROUTE | grep $DEVNAME | while read dest gw mask flags metric ref use iface; do

    # Compare interface name 
    if [ "$iface" = "$DEVNAME" ]; then
   
	# Test if route is up?
        if echo $flags | grep U >/dev/null 2>&1; then
	    # route through gateway ?
	    if [ "$gw" = "*" ]; then
    		echo "  del $dest netmask $mask dev $iface"
    		$ROUTE del -net $dest netmask $mask dev $iface
            else
    		echo "  del $dest gw $gw netmask $mask dev $iface"
   		$ROUTE del -net $dest gw $gw netmask $mask dev $iface
	    fi
	fi
    fi
done
echo " Done!"