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#!/usr/bin/env python3
#
# Copyright (C) 2018 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/>.
#
#
# Normalizes IPv6 addresses so that they can be passed to iproute2,
# since iproute2 will not take an address with leading zeroes for an argument
import re
import sys
import ipaddress
if __name__ == '__main__':
if len(sys.argv) < 2:
print("Argument required")
sys.exit(1)
address_string, prefix_length = re.match(r'(.+)/(.+)', sys.argv[1]).groups()
try:
address = ipaddress.IPv6Address(address_string)
normalized_address = address.compressed
except ipaddress.AddressValueError:
# It's likely an IPv4 address, do nothing
normalized_address = address_string
print("{0}/{1}".format(normalized_address, prefix_length))
sys.exit(0)
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