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dhcp_relay.py
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dhcp_relay.py
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#!/usr/bin/env python3
#
# Copyright (C) 2018-2020 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.template import render
from vyos.util import call
from vyos.util import dict_search
from vyos.xml import defaults
from vyos import ConfigError
from vyos import airbag
airbag.enable()
config_file = r'/run/dhcp-relay/dhcrelay.conf'
def get_config(config=None):
if config:
conf = config
else:
conf = Config()
base = ['service', 'dhcp-relay']
if not conf.exists(base):
return None
relay = conf.get_config_dict(base, key_mangling=('-', '_'), get_first_key=True)
# 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)
relay = dict_merge(default_values, relay)
return relay
def verify(relay):
# bail out early - looks like removal from running config
if not relay:
return None
if 'lo' in (dict_search('interface', relay) or []):
raise ConfigError('DHCP relay does not support the loopback interface.')
if 'server' not in relay :
raise ConfigError('No DHCP relay server(s) configured.\n' \
'At least one DHCP relay server required.')
return None
def generate(relay):
# bail out early - looks like removal from running config
if not relay:
return None
render(config_file, 'dhcp-relay/dhcrelay.conf.tmpl', relay)
return None
def apply(relay):
# bail out early - looks like removal from running config
if not relay:
call('systemctl stop isc-dhcp-relay.service')
if os.path.exists(config_file):
os.unlink(config_file)
return None
call('systemctl restart isc-dhcp-relay.service')
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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