#!/usr/bin/env python3 # # Copyright (C) 2022 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 sys import exit from sys import argv from vyos.config import Config from vyos.configdict import dict_merge from vyos.configverify import verify_vrf from vyos.template import render_to_string from vyos import ConfigError from vyos import frr from vyos import airbag airbag.enable() def get_config(config=None): if config: conf = config else: conf = Config() vrf = None if len(argv) > 1: vrf = argv[1] base_path = ['protocols', 'eigrp'] # eqivalent of the C foo ? 'a' : 'b' statement base = vrf and ['vrf', 'name', vrf, 'protocols', 'eigrp'] or base_path eigrp = conf.get_config_dict(base, key_mangling=('-', '_'), get_first_key=True, no_tag_node_value_mangle=True) # Assign the name of our VRF context. This MUST be done before the return # statement below, else on deletion we will delete the default instance # instead of the VRF instance. if vrf: eigrp.update({'vrf' : vrf}) if not conf.exists(base): eigrp.update({'deleted' : ''}) if not vrf: # We are running in the default VRF context, thus we can not delete # our main EIGRP instance if there are dependent EIGRP VRF instances. eigrp['dependent_vrfs'] = conf.get_config_dict(['vrf', 'name'], key_mangling=('-', '_'), get_first_key=True, no_tag_node_value_mangle=True) return eigrp # We also need some additional information from the config, prefix-lists # and route-maps for instance. They will be used in verify(). # # XXX: one MUST always call this without the key_mangling() option! See # vyos.configverify.verify_common_route_maps() for more information. tmp = conf.get_config_dict(['policy']) # Merge policy dict into "regular" config dict eigrp = dict_merge(tmp, eigrp) return eigrp def verify(eigrp): if not eigrp or 'deleted' in eigrp: return if 'system_as' not in eigrp: raise ConfigError('EIGRP system-as must be defined!') if 'vrf' in eigrp: verify_vrf(eigrp) def generate(eigrp): if not eigrp or 'deleted' in eigrp: return None eigrp['frr_eigrpd_config'] = render_to_string('frr/eigrpd.frr.j2', eigrp) def apply(eigrp): eigrp_daemon = 'eigrpd' # Save original configuration prior to starting any commit actions frr_cfg = frr.FRRConfig() # Generate empty helper string which can be ammended to FRR commands, it # will be either empty (default VRF) or contain the "vrf <name" statement vrf = '' if 'vrf' in eigrp: vrf = ' vrf ' + eigrp['vrf'] frr_cfg.load_configuration(eigrp_daemon) frr_cfg.modify_section(f'^router eigrp \d+{vrf}', stop_pattern='^exit', remove_stop_mark=True) if 'frr_eigrpd_config' in eigrp: frr_cfg.add_before(frr.default_add_before, eigrp['frr_eigrpd_config']) frr_cfg.commit_configuration(eigrp_daemon) return None if __name__ == '__main__': try: c = get_config() verify(c) generate(c) apply(c) except ConfigError as e: print(e) exit(1)