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service_mdns_repeater.py
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service_mdns_repeater.py
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#!/usr/bin/env python3
#
# Copyright (C) 2017-2024 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 json import loads
from sys import exit
from netifaces import ifaddresses, AF_INET, AF_INET6
from vyos.config import Config
from vyos.configverify import verify_interface_exists
from vyos.ifconfig.vrrp import VRRP
from vyos.template import render
from vyos.utils.process import call
from vyos import ConfigError
from vyos import airbag
airbag.enable()
config_file = '/run/avahi-daemon/avahi-daemon.conf'
systemd_override = r'/run/systemd/system/avahi-daemon.service.d/override.conf'
vrrp_running_file = '/run/mdns_vrrp_active'
def get_config(config=None):
if config:
conf = config
else:
conf = Config()
base = ['service', 'mdns', 'repeater']
if not conf.exists(base):
return None
mdns = conf.get_config_dict(base, key_mangling=('-', '_'),
no_tag_node_value_mangle=True,
get_first_key=True,
with_recursive_defaults=True)
if mdns:
mdns['vrrp_exists'] = conf.exists('high-availability vrrp')
mdns['config_file'] = config_file
return mdns
def verify(mdns):
if not mdns or 'disable' in mdns:
return None
# We need at least two interfaces to repeat mDNS advertisments
if 'interface' not in mdns or len(mdns['interface']) < 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['interface']:
verify_interface_exists(mdns, interface)
if mdns['ip_version'] in ['ipv4', 'both'] and AF_INET not in ifaddresses(interface):
raise ConfigError('mDNS repeater requires an IPv4 address to be '
f'configured on interface "{interface}"')
if mdns['ip_version'] in ['ipv6', 'both'] and AF_INET6 not in ifaddresses(interface):
raise ConfigError('mDNS repeater requires an IPv6 address to be '
f'configured on interface "{interface}"')
return None
# Get VRRP states from interfaces, returns only interfaces where state is MASTER
def get_vrrp_master(interfaces):
json_data = loads(VRRP.collect('json'))
for group in json_data:
if 'data' in group:
if 'ifp_ifname' in group['data']:
iface = group['data']['ifp_ifname']
state = group['data']['state'] # 2 = Master
if iface in interfaces and state != 2:
interfaces.remove(iface)
return interfaces
def generate(mdns):
if not mdns:
return None
if 'disable' in mdns:
print('Warning: mDNS repeater will be deactivated because it is disabled')
return None
if mdns['vrrp_exists'] and 'vrrp_disable' in mdns:
mdns['interface'] = get_vrrp_master(mdns['interface'])
if len(mdns['interface']) < 2:
return None
render(config_file, 'mdns-repeater/avahi-daemon.conf.j2', mdns)
render(systemd_override, 'mdns-repeater/override.conf.j2', mdns)
return None
def apply(mdns):
systemd_service = 'avahi-daemon.service'
# Reload systemd manager configuration
call('systemctl daemon-reload')
if not mdns or 'disable' in mdns:
call(f'systemctl stop {systemd_service}')
if os.path.exists(config_file):
os.unlink(config_file)
if os.path.exists(vrrp_running_file):
os.unlink(vrrp_running_file)
else:
if 'vrrp_disable' not in mdns and os.path.exists(vrrp_running_file):
os.unlink(vrrp_running_file)
if mdns['vrrp_exists'] and 'vrrp_disable' in mdns:
if not os.path.exists(vrrp_running_file):
os.mknod(vrrp_running_file) # vrrp script looks for this file to update mdns repeater
if len(mdns['interface']) < 2:
call(f'systemctl stop {systemd_service}')
return None
call(f'systemctl restart {systemd_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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