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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 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 sys
import os
import jinja2
import netifaces
from vyos.config import Config
from vyos import ConfigError
config_file = r'/etc/default/mdns-repeater'
config_tmpl = """
### Autogenerated by mdns_repeater.py ###
DAEMON_ARGS="{{ interfaces | join(' ') }}"
"""
default_config_data = {
'disabled': False,
'interfaces': []
}
def get_config():
mdns = default_config_data
conf = Config()
if not conf.exists('service mdns repeater'):
return None
else:
conf.set_level('service mdns repeater')
# 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 netifaces.AF_INET in netifaces.ifaddresses(interface).keys():
if len(netifaces.ifaddresses(interface)[netifaces.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
tmpl = jinja2.Template(config_tmpl)
config_text = tmpl.render(mdns)
with open(config_file, 'w') as f:
f.write(config_text)
return None
def apply(mdns):
if (mdns is None) or mdns['disabled']:
os.system('sudo systemctl stop mdns-repeater')
if os.path.exists(config_file):
os.unlink(config_file)
else:
os.system('sudo systemctl restart mdns-repeater')
return None
if __name__ == '__main__':
try:
c = get_config()
verify(c)
generate(c)
apply(c)
except ConfigError as e:
print(e)
sys.exit(1)

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