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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/>.
# T3741: no-ipv4-unicast is now enabled by default
from sys import argv
from sys import exit
from vyos.configtree import ConfigTree
from vyos.template import is_ipv4
if (len(argv) < 1):
print("Must specify file name!")
exit(1)
file_name = argv[1]
with open(file_name, 'r') as f:
config_file = f.read()
base = ['protocols', 'bgp']
config = ConfigTree(config_file)
if not config.exists(base):
# Nothing to do
exit(0)
# This is now a default option - simply delete it.
# As it was configured explicitly - we can also bail out early as we need to
# do nothing!
if config.exists(base + ['parameters', 'default', 'no-ipv4-unicast']):
config.delete(base + ['parameters', 'default', 'no-ipv4-unicast'])
# Check if the "default" node is now empty, if so - remove it
if len(config.list_nodes(base + ['parameters', 'default'])) == 0:
config.delete(base + ['parameters', 'default'])
# Check if the "default" node is now empty, if so - remove it
if len(config.list_nodes(base + ['parameters'])) == 0:
config.delete(base + ['parameters'])
# As we now install a new default option into BGP we need to migrate all
# existing BGP neighbors and restore the old behavior
if config.exists(base + ['neighbor']):
for neighbor in config.list_nodes(base + ['neighbor']):
peer_group = base + ['neighbor', neighbor, 'peer-group']
if config.exists(peer_group):
peer_group_name = config.return_value(peer_group)
# peer group enables old behavior for neighbor - bail out
if config.exists(base + ['peer-group', peer_group_name, 'address-family', 'ipv4-unicast']):
continue
afi_ipv4 = base + ['neighbor', neighbor, 'address-family', 'ipv4-unicast']
if not config.exists(afi_ipv4):
config.set(afi_ipv4)
try:
with open(file_name, 'w') as f:
f.write(config.to_string())
except OSError as e:
print(f'Failed to save the modified config: {e}')
exit(1)

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