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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)
vrf = argv[1]
length = len(vrf)
# must not exceed Linux Kernel IFNAMSIZ definition
if length not in range(1, 16):
exit(1)
# allow only alpha numerical characters, - and _
pattern = r'^[A-Za-z0-9_-]+$'
if not re.match(pattern, vrf):
exit(1)
# Treat loopback interface "lo" explicitly. Adding "lo" explicitly to the
# following regex pattern would deny any VRF name starting with lo - thuse
# local-vrf would be illegal - and that we do not want.
if vrf == "lo":
exit(1)
# VRF name must not conflict with local interface type prefix
pattern = r'^(?!(bond|br|dum|eth|lan|eno|ens|enp|enx|gnv|ipoe|l2tp|l2tpeth|\
vtun|ppp|pppoe|peth|tun|vti|vxlan|wg|wlan|wwan|\d)\d*(\.\d+)?(v.+)?).*$'
if not re.match(pattern, vrf):
exit(1)
exit(0)
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