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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
import sys
if __name__ == '__main__':
if len(sys.argv) != 2:
sys.exit(1)
vrf = sys.argv[1]
length = len(vrf)
if length not in range(1, 17):
sys.exit('VRF instance name must be 16 characters or less')
# 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(f'"{vrf}" is invalid as VRF name as it is an interface name')
pattern = "^(?!(bond|br|dum|eth|lan|eno|ens|enp|enx|gnv|ipoe|l2tp|l2tpeth|" \
"vtun|ppp|pppoe|peth|tun|vti|vxlan|wg|wlan|wlm)\d+(\.\d+(v.+)?)?$).*$"
if not re.match(pattern, vrf):
sys.exit(f'"{vrf}" is invalid as VRF name as it is an interface name')
sys.exit(0)
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