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mdns_repeater.py
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mdns_repeater.py
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#!/usr/bin/env python3
#
# Copyright (C) 2017-2020 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 copy import deepcopy
from netifaces import ifaddresses, AF_INET
from vyos.config import Config
from vyos import ConfigError
from vyos.util import call
from vyos.template import render
from vyos import airbag
airbag.enable()
config_file = r'/etc/default/mdns-repeater'
default_config_data = {
'disabled': False,
'interfaces': []
}
def get_config():
mdns = deepcopy(default_config_data)
conf = Config()
base = ['service', 'mdns', 'repeater']
if not conf.exists(base):
return None
else:
conf.set_level(base)
# Service can be disabled by user
if conf.exists(['disable']):
mdns['disabled'] = True
return mdns
# Interface to repeat mDNS advertisements
if conf.exists(['interface']):
mdns['interfaces'] = conf.return_values(['interface'])
return mdns
def verify(mdns):
if mdns is None:
return None
if mdns['disabled']:
return None
# We need at least two interfaces to repeat mDNS advertisments
if len(mdns['interfaces']) < 2:
raise ConfigError('mDNS repeater requires at least 2 configured interfaces!')
# For mdns-repeater to work it is essential that the interfaces has
# an IPv4 address assigned
for interface in mdns['interfaces']:
if AF_INET in ifaddresses(interface).keys():
if len(ifaddresses(interface)[AF_INET]) < 1:
raise ConfigError('mDNS repeater requires an IPv6 address configured on interface %s!'.format(interface))
return None
def generate(mdns):
if mdns is None:
return None
if mdns['disabled']:
print('Warning: mDNS repeater will be deactivated because it is disabled')
return None
render(config_file, 'mdns-repeater/mdns-repeater.tmpl', mdns)
return None
def apply(mdns):
if (mdns is None) or mdns['disabled']:
call('systemctl stop mdns-repeater.service')
if os.path.exists(config_file):
os.unlink(config_file)
else:
call('systemctl restart mdns-repeater.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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