#!/bin/sh


# This Source Code Form is subject to the terms of the Mozilla Public License,
# v. 2.0. If a copy of the MPL was not distributed with this file, You can
# obtain one at https://mozilla.org/MPL/2.0/.

# This script provides a simulated network environment for a simulated Zephyr
# firmware.
#
# It is based on providing a simulated layer 2 network interface (TAP) and
# providing required services as Linux processes there. One example is the
# radvd service which send router advertisements which are required for IPv6
# stateless address auto configuration (SLAAC).
#
# Root rights are required to run this script. Use your preferred privilege
# escalation program to call this script like this:
#
#     sudo ./simulate-network.sh


set -euf


FW="$(dirname "$0")"
RADVD_CONF="${FW}/radvd.conf"

INTERFACE='zeth'
LINUX_IP='fdb3:c9f2:efda:1::2'
NETMASK='64'

radvd_pid=''


cleanup() {
	if test "$radvd_pid" != ""
	then
		kill "$radvd_pid"
	fi

	ip link delete "$INTERFACE"
}


trap cleanup EXIT

set -x

ip tuntap add "$INTERFACE" mode tap
ip link set dev "$INTERFACE" up
ip addr add "${LINUX_IP}/${NETMASK}" dev "$INTERFACE"

radvd --nodaemon --config "$RADVD_CONF" > /dev/null 2>&1 &
radvd_pid="$!"

wait