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#!/usr/bin/env python3
#
# Copyright (C) 2021-2023 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/>.
import os
from sys import exit
from vyos.config import Config
from vyos.config import config_dict_merge
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', 'babel']
babel = 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:
babel['interface_removed'] = list(interfaces_removed)
# Bail out early if configuration tree does not exist
if not conf.exists(base):
babel.update({'deleted' : ''})
return babel
# We have gathered the dict representation of the CLI, but there are default
# values which we need to update into the dictionary retrieved.
default_values = conf.get_config_defaults(base, key_mangling=('-', '_'),
get_first_key=True,
recursive=True)
# merge in default values
babel = config_dict_merge(default_values, babel)
# 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
babel = dict_merge(tmp, babel)
return babel
def verify(babel):
if not babel:
return None
# verify distribute_list
if "distribute_list" in babel:
acl_keys = {
"ipv4": [
"distribute_list.ipv4.access_list.in",
"distribute_list.ipv4.access_list.out",
],
"ipv6": [
"distribute_list.ipv6.access_list.in",
"distribute_list.ipv6.access_list.out",
]
}
prefix_list_keys = {
"ipv4": [
"distribute_list.ipv4.prefix_list.in",
"distribute_list.ipv4.prefix_list.out",
],
"ipv6":[
"distribute_list.ipv6.prefix_list.in",
"distribute_list.ipv6.prefix_list.out",
]
}
for address_family in ["ipv4", "ipv6"]:
for iface_key in babel["distribute_list"].get(address_family, {}).get("interface", {}).keys():
acl_keys[address_family].extend([
f"distribute_list.{address_family}.interface.{iface_key}.access_list.in",
f"distribute_list.{address_family}.interface.{iface_key}.access_list.out"
])
prefix_list_keys[address_family].extend([
f"distribute_list.{address_family}.interface.{iface_key}.prefix_list.in",
f"distribute_list.{address_family}.interface.{iface_key}.prefix_list.out"
])
for address_family, keys in acl_keys.items():
for key in keys:
acl = dict_search(key, babel)
if acl:
verify_access_list(acl, babel, version='6' if address_family == 'ipv6' else '')
for address_family, keys in prefix_list_keys.items():
for key in keys:
prefix_list = dict_search(key, babel)
if prefix_list:
verify_prefix_list(prefix_list, babel, version='6' if address_family == 'ipv6' else '')
def generate(babel):
if not babel or 'deleted' in babel:
return None
babel['new_frr_config'] = render_to_string('frr/babeld.frr.j2', babel)
return None
def apply(babel):
babel_daemon = 'babeld'
# Save original configuration prior to starting any commit actions
frr_cfg = frr.FRRConfig()
frr_cfg.load_configuration(babel_daemon)
frr_cfg.modify_section('^router babel', stop_pattern='^exit', remove_stop_mark=True)
for key in ['interface', 'interface_removed']:
if key not in babel:
continue
for interface in babel[key]:
frr_cfg.modify_section(f'^interface {interface}', stop_pattern='^exit', remove_stop_mark=True)
if 'new_frr_config' in babel:
frr_cfg.add_before(frr.default_add_before, babel['new_frr_config'])
frr_cfg.commit_configuration(babel_daemon)
return None
if __name__ == '__main__':
try:
c = get_config()
verify(c)
generate(c)
apply(c)
except ConfigError as e:
print(e)
exit(1)
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