#!/bin/sh
# Copyright 2018 Intel Corporation
#
# 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.

read_hw_mac() {
	local iface="$1"
	cat /sys/class/net/"$iface"/address
}

set_hw_mac() {
	local iface="$1"
	local mac="$2"
	ip link show dev "$iface" | grep -q "${iface}:.*\<UP\>" 2>/dev/null
	local up=$?
	[[ $up -eq 0 ]] && ip link set dev "$iface" down
	ip link set dev "$iface" address "$mac"
	[[ $up -eq 0 ]] && ip link set dev "$iface" up
}

SOFS_MNT=/var/sofs
read_sofs_mac() {
	local iface="$1"
	cat "${SOFS_MNT}/factory-settings/network/mac/${iface}" 2>/dev/null
}

read_fw_env_mac() {
	local envname="$1"
	fw_printenv "$envname" 2>/dev/null | sed "s/^$envname=//"
}

set_fw_env_mac() {
	local envname="$1"
	local mac="$2"
	fw_setenv "$envname" "$mac"
}

mac_check() {
	local iface="$1"
	local envname="$2"

	# read current HW MAC addr
	local hw_mac=$(read_hw_mac "$iface")

	# read saved sofs MAC addr
	local sofs_mac=$(read_sofs_mac "$iface")

	# if set and not the same as HW addr, set HW addr
	if [ -n "$sofs_mac" ] && [ "$hw_mac" != "$sofs_mac" ]; then
		set_hw_mac "$iface" "$sofs_mac"
		hw_mac="$sofs_mac"
	fi

	# read saved fw_env MAC addr
	local fw_env_mac=$(read_fw_env_mac "$envname")

	# save to fw_env if not the same as HW addr
	if [ -z "$fw_env_mac" ] || [ "$fw_env_mac" != "$hw_mac" ]; then
		set_fw_env_mac "$envname" "$hw_mac"
	fi
}

while read IFACE UBDEV; do
	mac_check "$IFACE" "$UBDEV"
done <<-END_CONF
	eth0 eth1addr
	eth1 ethaddr
END_CONF