scw-setup-he-ipv6

#!/bin/bash

exec 1> >(logger -s -t $(basename $0)) 2>&1

tun_name="he-ipv6"
tun_ipv4=""
src_intf="eth0"
src_ipv6=""

function usage() {
  echo "usage: $(basename $0) -t <tun_ipv4> -6 <src_ipv6> [-i <src_intf>] [-4 <src_ipv4>] [-n <tun_name>]"
  echo ""
  echo "  -t <tun_ipv4>    Tunnel server IPv4 Address"
  echo "  -6 <src_ipv6>    Tunnel client IPv6 Address"
  echo "  -i <src_intf>    Tunnel client source interface"
  echo "  -4 <src_ipv4>    Tunnel client IPv4 Address"
  echo "  -n <tun_name>    Tunnel interface name"
  echo ""
  echo "Setup tunnel at https://tunnelbroker.net first."
  exit 1
}

while getopts ":t:4:6:n:" opt; do
  case $opt in
    n)
      tun_name="$OPTARG"
      ;;
    t)
      tun_ipv4="$OPTARG"
      ;;
    i)
      src_intf="$OPTARG"
      ;;
    4)
      src_ipv4="$OPTARG"
      ;;
    6)
      src_ipv6="$OPTARG"
      ;;
    ?)
      usage
      ;;
    :)
      echo "Option -$OPTARG requires an argument." >&2
      usage
      ;;
  esac
done

if [ "${src_ipv6}x" == "x" ] || [ "${tun_ipv4}x" == "x" ] ; then
  usage
fi

if [ "${src_ipv4}x" == "x" ] ; then
  src_ipv4="$(ip -f inet -o addr show ${src_intf} |cut -d\  -f 7 | cut -d/ -f 1)"
fi

echo "Tunnel interface name: ${tun_name}"
echo "Tunnel server IPv4 Address: ${tun_ipv4}"
echo "Tunnel client source interface: ${src_intf} (${src_ipv4})"
echo "Tunnel client IPv6 Address: ${src_ipv6}"
echo ""
/sbin/modprobe ipv6
/sbin/ip tunnel add ${tun_name} mode sit remote ${tun_ipv4} local ${src_ipv4} ttl 255
/sbin/ip link set ${tun_name} up
/sbin/ip addr add ${src_ipv6} dev ${tun_name}
/sbin/ip route add ::/0 dev ${tun_name}
/sbin/ip -f inet6 addr

exit 0