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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/>.
from argparse import ArgumentParser
from vyos.template import is_ipv4
parser = ArgumentParser()
group = parser.add_mutually_exclusive_group()
group.add_argument('--route-distinguisher', action='store', help='Validate BGP route distinguisher')
group.add_argument('--route-target', action='store', help='Validate one BGP route-target')
group.add_argument('--route-target-multi', action='store', help='Validate multiple, whitespace separated BGP route-targets')
args = parser.parse_args()
def is_valid(rt):
""" Verify BGP RD/RT - both can be verified using the same logic """
# every RD/RT (route distinguisher/route target) needs to have a colon and
# must consists of two parts
value = rt.split(':')
if len(value) != 2:
return False
# An RD/RT must either be only numbers, or the first part must be an IPv4
# address
if (is_ipv4(value[0]) or value[0].isdigit()) and value[1].isdigit():
return True
return False
if __name__ == '__main__':
if args.route_distinguisher:
if not is_valid(args.route_distinguisher):
exit(1)
elif args.route_target:
if not is_valid(args.route_target):
exit(1)
elif args.route_target_multi:
for rt in args.route_target_multi.split(' '):
if not is_valid(rt):
exit(1)
else:
parser.print_help()
exit(1)
exit(0)
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