ip-protocol
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ip-protocol
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	#!/usr/bin/env python3
	#
	# Copyright VyOS maintainers and contributors <maintainers@vyos.io>
	#
	# 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 argv,exit

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

	input = argv[1]
	try:
	# IP protocol can be in the range 0 - 255, thus the range must end with 256
	if int(input) in range(0, 256):
	exit(0)
	except ValueError:
	pass

	pattern = "!?\\b(all\|ip\|hopopt\|icmp\|igmp\|ggp\|ipencap\|st\|tcp\|egp\|igp\|pup\|udp\|" \
	"tcp_udp\|hmp\|xns-idp\|rdp\|iso-tp4\|dccp\|xtp\|ddp\|idpr-cmtp\|ipv6\|" \
	"ipv6-route\|ipv6-frag\|idrp\|rsvp\|gre\|esp\|ah\|skip\|ipv6-icmp\|icmpv6\|" \
	"ipv6-nonxt\|ipv6-opts\|rspf\|vmtp\|eigrp\|ospf\|ax.25\|ipip\|etherip\|" \
	"encap\|99\|pim\|ipcomp\|vrrp\|l2tp\|isis\|sctp\|fc\|mobility-header\|" \
	"udplite\|mpls-in-ip\|manet\|hip\|shim6\|wesp\|rohc)\\b"
	if re.match(pattern, input):
	exit(0)

	print(f'Error: {input} is not a valid IP protocol')
	exit(1)