#!/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) < 2: 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)