#!/bin/bash
#
# Copyright 2023 Collier Technologies LLC
# https://wp.c9h.org/cj/?p=1844
#

# # These variables are for the use of the scripts run by run-parts
# PPP_IFACE="$1"
# PPP_TTY="$2"
# PPP_SPEED="$3"
# PPP_LOCAL="$4"
# PPP_REMOTE="$5"
# PPP_IPPARAM="$6"

set -x

DEFAULT_FILE="/etc/default/centurylink-6rd"
if [[ -f ${DEFAULT_FILE} ]]; then
    source ${DEFAULT_FILE}
    if [[ -f ${HEADER_FILE} ]]; then
	cp ${HEADER_FILE} /etc/radvd.conf
    fi
else
    LAN_IFACE="setThis"
fi

TUNIFACE=6rdif
first_ipv6_network=$(printf "2602:%02x:%02x%02x:%02x00::" $(echo ${PPP_LOCAL} | tr . ' '))

i=1
for IFACE in $( echo ${LAN_IFACE} | tr , ' ' ) ; do
    ipv6_network=$(printf "2602:%02x:%02x%02x:%02x0${i}::" $(echo ${PPP_LOCAL} | tr . ' '))
    ip -6 addr del ${ipv6_network}1/64 dev ${TUNIFACE}
    ip -6 route del "${ipv6_network}/64" dev ${IFACE}
    ip -6 addr flush dev $IFACE to 2602:61::/30
    let "i=i+1"
done

ip addr del ${first_ipv6_network}1/64 dev ${TUNIFACE}
ip -l 5 -6 addr flush scope global dev ${TUNIFACE}

ip -6 route del default dev ${TUNIFACE}
ip link set down dev ${TUNIFACE}
ip link del ${TUNIFACE}

set +x