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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/>.
#
#
# Between 1.2.3 and 1.2.4, FRR added per-neighbor enforce-first-as option.
# Unfortunately they also removed the global enforce-first-as option,
# which broke all old configs that used to have it.
#
# To emulate the effect of the original option, we insert it in every neighbor
# if the config used to have the original global option
import sys
from vyos.configtree import ConfigTree
if (len(sys.argv) < 1):
print("Must specify file name!")
sys.exit(1)
file_name = sys.argv[1]
with open(file_name, 'r') as f:
config_file = f.read()
config = ConfigTree(config_file)
if not config.exists(['protocols', 'bgp']):
# Nothing to do
sys.exit(0)
else:
# Check if BGP is actually configured and obtain the ASN
asn_list = config.list_nodes(['protocols', 'bgp'])
if asn_list:
# There's always just one BGP node, if any
asn = asn_list[0]
else:
# There's actually no BGP, just its empty shell
sys.exit(0)
# Check if BGP enforce-first-as option is set
enforce_first_as_path = ['protocols', 'bgp', asn, 'parameters', 'enforce-first-as']
if config.exists(enforce_first_as_path):
# Delete the obsolete option
config.delete(enforce_first_as_path)
# Now insert it in every peer
peers = config.list_nodes(['protocols', 'bgp', asn, 'neighbor'])
for p in peers:
config.set(['protocols', 'bgp', asn, 'neighbor', p, 'enforce-first-as'])
else:
# Do nothing
sys.exit(0)
# Save a new configuration file
try:
with open(file_name, 'w') as f:
f.write(config.to_string())
except OSError as e:
print("Failed to save the modified config: {}".format(e))
sys.exit(1)
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