#!/bin/bash


#
#    Copyright (c) 2014-2017 Nest Labs, Inc.
#    All rights reserved.
#
#    Licensed under the Apache License, Version 2.0 (the "License");
#    you may not use this file except in compliance with the License.
#    You may obtain a copy of the License at
#
#        http://www.apache.org/licenses/LICENSE-2.0
#
#    Unless required by applicable law or agreed to in writing, software
#    distributed under the License is distributed on an "AS IS" BASIS,
#    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
#    See the License for the specific language governing permissions and
#    limitations under the License.
#


SCRIPT_NAME=remove-tunnel-intf.sh
SCRIPT_DIR=`dirname $0`
SCRIPT_DIR=`cd ${SCRIPT_DIR}; pwd`
SYS_NAME=`uname -s`
USER_NAME=`id -nu`
GRP_NAME=`id -ng`
DEV_PREFIX="weave-tun"

function usage() 
{
    cat <<END
Usage:

    ${SCRIPT_NAME} <options>
    
    -p <string>
    --prefix <string>
        
        Device name prefix.  Defaults to 'weave-tun'.

    -n
    --no-addresses
    
        Don't assign ip addresses to interfaces.

END
}

# Parse options
#
while [ -n "$1" ]; do
    case $1 in
        -p | --prefix)
            DEV_PREFIX=$2
            shift 2
            ;;
        -h | --help)
            usage
            exit 1
            ;;
        *)
            echo "${SCRIPT_NAME} : Unrecognized option: $1"
            usage
            exit 1
            ;;
    esac
done

# Force prompt for root password before we begin.
sudo true || exit -1

# The following works on Linux only...
#
if [ "${SYS_NAME}" = "Linux" ]; then

    # Setup weave tun interfaces.
    #
        # Fabric Id = 1
        # Subnet Id = 1
        if ${ASSIGN_ADDRESSES}; then
            sudo ifconfig lo del fd00:0:1:1::101/64 > /dev/null

        fi

        #sudo ifconfig ${DEV_PREFIX}-${i} down > /dev/null
        sudo ip link set ${DEV_PREFIX}0 down 
        
        sudo ip tuntap del dev ${DEV_PREFIX}0 mode tun  > /dev/null
 
        #Set ipv6 forwarding to FALSE 
        sudo sysctl -w net.ipv6.conf.all.forwarding=0 > /dev/null
      
fi