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	#!/usr/bin/env python3
	#
	# Copyright (C) 2020 VyOS maintainers and contributors
	#
	# This program is free software; you can redistribute it and/or modify
	# it under the terms of the GNU General Public License version 2 or later as
	# published by the Free Software Foundation.
	#
	# This program is distributed in the hope that it will be useful,
	# but WITHOUT ANY WARRANTY; without even the implied warranty of
	# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	# GNU General Public License for more details.
	#
	# You should have received a copy of the GNU General Public License
	# along with this program. If not, see <http://www.gnu.org/licenses/>.

	import re
	from sys import exit, argv

	if len(argv) == 2:
	len = len(argv[1])
	# VRF instance name must be 16 characters or less, python range needs to be
	# extended by one
	if not len in range(1, 17):
	exit(1)

	# Treat loopback interface "lo" explicitly. Adding "lo" explicitly to the
	# following regex pattern would deny any VRF name starting with lo - thuse
	# local-vrf would be illegal - and that we do not want.
	if argv[1] == "lo":
	exit(1)

	# VRF instances should not be named after regular interface names like bond0,
	# br10 and so on - this can cause a lot of confusion/trouble
	pattern = "^(?!(bond\|br\|dum\|eth\|lan\|eno\|ens\|enp\|enx\|gnv\|ipoe\|l2tp\|l2tpeth\|" \
	"vtun\|ppp\|pppoe\|peth\|tun\|vti\|vxlan\|wg\|wlan\|wlm)[0-9]+).*$"
	if re.match(pattern, argv[1]):
	exit(0)

	exit(1)