#!/bin/sh
#
# Copyright 2019-2023, Digi International Inc.
#
# 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 http://mozilla.org/MPL/2.0/.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
#
# Description: disconnect/reconnect the interface that generated the
#              'device-connectivity-change' event
#

log() {
	if type "systemd-cat" >/dev/null 2>/dev/null; then
		systemd-cat -p "${1}" -t ifdownup printf "%s" "${2}"
	else
		logger -p "${1}" -t ifdownup "${2}"
	fi
}

# $1 = file, $2 = section, $3 = parameter
get_cfg_param() {
	sed -nr "/^\[${2}\]/ { :l /^${3}[ ]*=/ { s/[^=]*=[ ]*//; p; q;}; n; b l;}" "${1}" | tr '[:upper:]' '[:lower:]'
}

ifdownup=$(get_cfg_param /etc/NetworkManager/NetworkManager.conf digi-recovery ifdownup)
[ -z "${ifdownup}" ] && ifdownup="false"

if [ "${ifdownup}" = "true" ] || [ "${ifdownup}" = "yes" ]; then
	log info "device-connectivity-change detected on interface ${DEVICE_IP_IFACE}"
	nmcli device disconnect "${DEVICE_IP_IFACE}"
	nmcli connection up "${CONNECTION_ID}"
fi
