diff options
Diffstat (limited to 'src/conf_mode/protocols_rip.py')
| -rw-r--r-- | src/conf_mode/protocols_rip.py | 139 |
1 files changed, 139 insertions, 0 deletions
diff --git a/src/conf_mode/protocols_rip.py b/src/conf_mode/protocols_rip.py new file mode 100644 index 0000000..9afac54 --- /dev/null +++ b/src/conf_mode/protocols_rip.py @@ -0,0 +1,139 @@ +#!/usr/bin/env python3 +# +# Copyright (C) 2021-2024 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 vyos.config import Config +from vyos.configdict import dict_merge +from vyos.configdict import node_changed +from vyos.configverify import verify_common_route_maps +from vyos.configverify import verify_access_list +from vyos.configverify import verify_prefix_list +from vyos.utils.dict import dict_search +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() + base = ['protocols', 'rip'] + rip = conf.get_config_dict(base, key_mangling=('-', '_'), get_first_key=True) + + # FRR has VRF support for different routing daemons. As interfaces belong + # to VRFs - or the global VRF, we need to check for changed interfaces so + # that they will be properly rendered for the FRR config. Also this eases + # removal of interfaces from the running configuration. + interfaces_removed = node_changed(conf, base + ['interface']) + if interfaces_removed: + rip['interface_removed'] = list(interfaces_removed) + + # Bail out early if configuration tree does not exist + if not conf.exists(base): + rip.update({'deleted' : ''}) + return rip + + # We have gathered the dict representation of the CLI, but there are default + # options which we need to update into the dictionary retrived. + rip = conf.merge_defaults(rip, recursive=True) + + # 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 + rip = dict_merge(tmp, rip) + + return rip + +def verify(rip): + if not rip: + return None + + verify_common_route_maps(rip) + + acl_in = dict_search('distribute_list.access_list.in', rip) + if acl_in: verify_access_list(acl_in, rip) + + acl_out = dict_search('distribute_list.access_list.out', rip) + if acl_out: verify_access_list(acl_out, rip) + + prefix_list_in = dict_search('distribute_list.prefix-list.in', rip) + if prefix_list_in: verify_prefix_list(prefix_list_in, rip) + + prefix_list_out = dict_search('distribute_list.prefix_list.out', rip) + if prefix_list_out: verify_prefix_list(prefix_list_out, rip) + + if 'interface' in rip: + for interface, interface_options in rip['interface'].items(): + if 'authentication' in interface_options: + if {'md5', 'plaintext_password'} <= set(interface_options['authentication']): + raise ConfigError('Can not use both md5 and plaintext-password at the same time!') + if 'split_horizon' in interface_options: + if {'disable', 'poison_reverse'} <= set(interface_options['split_horizon']): + raise ConfigError(f'You can not have "split-horizon poison-reverse" enabled ' \ + f'with "split-horizon disable" for "{interface}"!') + +def generate(rip): + if not rip or 'deleted' in rip: + return None + + rip['new_frr_config'] = render_to_string('frr/ripd.frr.j2', rip) + return None + +def apply(rip): + rip_daemon = 'ripd' + zebra_daemon = 'zebra' + + # Save original configuration prior to starting any commit actions + frr_cfg = frr.FRRConfig() + + # The route-map used for the FIB (zebra) is part of the zebra daemon + frr_cfg.load_configuration(zebra_daemon) + frr_cfg.modify_section('^ip protocol rip route-map [-a-zA-Z0-9.]+', stop_pattern='(\s|!)') + frr_cfg.commit_configuration(zebra_daemon) + + frr_cfg.load_configuration(rip_daemon) + frr_cfg.modify_section('^key chain \S+', stop_pattern='^exit', remove_stop_mark=True) + frr_cfg.modify_section('^router rip', stop_pattern='^exit', remove_stop_mark=True) + + for key in ['interface', 'interface_removed']: + if key not in rip: + continue + for interface in rip[key]: + frr_cfg.modify_section(f'^interface {interface}', stop_pattern='^exit', remove_stop_mark=True) + + if 'new_frr_config' in rip: + frr_cfg.add_before(frr.default_add_before, rip['new_frr_config']) + frr_cfg.commit_configuration(rip_daemon) + + return None + +if __name__ == '__main__': + try: + c = get_config() + verify(c) + generate(c) + apply(c) + except ConfigError as e: + print(e) + exit(1) |