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protocols_eigrp.py
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protocols_eigrp.py
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#!/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.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)
import pprint
pprint.pprint(eigrp)
return eigrp
def verify(eigrp):
pass
def generate(eigrp):
if not eigrp or 'deleted' in eigrp:
return None
eigrp['protocol'] = 'eigrp' # required for frr/vrf.route-map.frr.j2
eigrp['frr_zebra_config'] = render_to_string('frr/vrf.route-map.frr.j2', eigrp)
eigrp['frr_eigrpd_config'] = render_to_string('frr/eigrpd.frr.j2', eigrp)
def apply(eigrp):
eigrp_daemon = 'eigrpd'
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(r'(\s+)?ip protocol eigrp route-map [-a-zA-Z0-9.]+', stop_pattern='(\s|!)')
if 'frr_zebra_config' in eigrp:
frr_cfg.add_before(frr.default_add_before, eigrp['frr_zebra_config'])
frr_cfg.commit_configuration(zebra_daemon)
# 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)

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