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#!/usr/bin/env python3
#
# Copyright (C) 2021 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.configdict import dict_merge
from vyos.configverify import verify_route_maps
from vyos.util import call
from vyos.util import dict_search
from vyos.xml import defaults
from vyos.template import render
from vyos.template import render_to_string
from vyos import ConfigError
from vyos import frr
from vyos import airbag
airbag.enable()
config_file = r'/tmp/rip.frr'
frr_daemon = 'ripd'
DEBUG = os.path.exists('/tmp/rip.debug')
if DEBUG:
import logging
lg = logging.getLogger("vyos.frr")
lg.setLevel(logging.DEBUG)
ch = logging.StreamHandler()
lg.addHandler(ch)
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)
# Bail out early if configuration tree does not exist
if not conf.exists(base):
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.
default_values = defaults(base)
# merge in remaining default values
rip = dict_merge(default_values, rip)
# We also need some additional information from the config, prefix-lists
# and route-maps for instance. They will be used in verify()
base = ['policy']
tmp = conf.get_config_dict(base, key_mangling=('-', '_'))
# Merge policy dict into OSPF dict
rip = dict_merge(tmp, rip)
return rip
def verify(rip):
if not rip:
return None
acl_in = dict_search('distribute_list.access_list.in', rip)
if acl_in and acl_in not in (dict_search('policy.access_list', rip) or []):
raise ConfigError(f'Inbound ACL "{acl_in}" does not exist!')
acl_out = dict_search('distribute_list.access_list.out', rip)
if acl_out and acl_out not in (dict_search('policy.access_list', rip) or []):
raise ConfigError(f'Outbound ACL "{acl_out}" does not exist!')
prefix_list_in = dict_search('distribute_list.prefix_list.in', rip)
if prefix_list_in and prefix_list_in not in (dict_search('policy.prefix_list', rip) or []):
raise ConfigError(f'Inbound prefix-list "{prefix_list_in}" does not exist!')
prefix_list_out = dict_search('distribute_list.prefix_list.out', rip)
if prefix_list_out and prefix_list_out not in (dict_search('policy.prefix_list', rip) or []):
raise ConfigError(f'Outbound prefix-list "{prefix_list_out}" does not exist!')
verify_route_maps(rip)
def generate(rip):
if not rip:
rip['new_frr_config'] = ''
return None
# render(config) not needed, its only for debug
render(config_file, 'frr/rip.frr.tmpl', rip)
rip['new_frr_config'] = render_to_string('frr/rip.frr.tmpl', rip)
return None
def apply(rip):
# Save original configuration prior to starting any commit actions
frr_cfg = frr.FRRConfig()
frr_cfg.load_configuration(frr_daemon)
frr_cfg.modify_section(r'interface \S+', '')
frr_cfg.modify_section('router rip', '')
frr_cfg.add_before(r'(ip prefix-list .*|route-map .*|line vty)', rip['new_frr_config'])
# Debugging
if DEBUG:
from pprint import pprint
print('')
print('--------- DEBUGGING ----------')
pprint(dir(frr_cfg))
print('Existing config:\n')
for line in frr_cfg.original_config:
print(line)
print(f'Replacement config:\n')
print(f'{rip["new_frr_config"]}')
print(f'Modified config:\n')
print(f'{frr_cfg}')
frr_cfg.commit_configuration(frr_daemon)
# If FRR config is blank, rerun the blank commit x times due to frr-reload
# behavior/bug not properly clearing out on one commit.
if rip['new_frr_config'] == '':
for a in range(5):
frr_cfg.commit_configuration(frr_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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