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	#!/usr/bin/env python3
	#
	# Copyright (C) 2021 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
	import sys

	from vyos.template import is_ipv4

	pattern = '(.):(.):(.*)'

	if __name__ == '__main__':
	if len(sys.argv) != 2:
	sys.exit(1)

	value = sys.argv[1].split(':')
	if not len(value) == 3:
	sys.exit(1)

	if not (re.match(pattern, sys.argv[1]) and
	(is_ipv4(value[0]) or value[0].isdigit()) and (value[1].isdigit() or value[1] == '*')):
	sys.exit(1)

	sys.exit(0)