#!/bin/sh

# Set an interface as managed / unmanaged by Network Manager
# 2013 Laurent Ghigonis <laurent@gouloum.fr>

# /etc/NetworkManager/NetworkManager.conf
# [keyfile]
# unmanaged-devices=mac:00:22:68:1c:59:b1;mac:00:1E:65:30:D1:C4

NMCONF=/etc/NetworkManager/NetworkManager.conf
progname=`basename $0`

usage_exit() {
	echo "usage: $progname <action> <interface>"
	echo
	echo "actions:"
	echo "status   # Default action"
	echo "manage   <interface>"
	echo "unmanage <interface>"
	echo "restart"
	exit 1
}

iface_status() {
	iface=$2
	mac=`ifconfig -a |grep -A5 $iface |grep ether |head -n1 |awk '{print $2}'`
	echo "Corresponding MAC : $mac"
	[[ $mac = "" ]] && echo "empty MAC !" && exit 1
	grep "mac:$mac" $NMCONF >/dev/null
	unmanaged=$?
}

[ X"$1" = X"-h" ] && usage_exit

action=$1
case $action in
m|manage)
	iface_status $@
	[[ $unmanaged -ne 0 ]] && echo "Already managed" && exit 1
	sudo sed -i s/"mac:fe:ff:ff:ff:ff:ff"// $NMCONF
	;;
u|unmanage)
	iface_status $@
	[[ $unmanaged -eq 0 ]] && echo "Already unmanaged" && exit 1
	sudo sed -i s/"\(unmanaged-devices=\)"/"\1mac:$mac;"/ $NMCONF
	;;
r|restart)
	# done below
	;;
*)
	echo $NMCONF
	cat $NMCONF
	exit 1
esac

sudo systemctl restart NetworkManager.service