From c9eaafd9f808aba8d29be73054e11d37577e539a Mon Sep 17 00:00:00 2001 From: Christian Breunig Date: Sat, 30 Dec 2023 23:25:20 +0100 Subject: T5474: establish common file name pattern for XML conf mode commands We will use _ as CLI level divider. The XML definition filename and also the Python helper should match the CLI node. Example: set interfaces ethernet -> interfaces_ethernet.xml.in set interfaces bond -> interfaces_bond.xml.in set service dhcp-server -> service_dhcp-server-xml.in (cherry picked from commit 4ef110fd2c501b718344c72d495ad7e16d2bd465) --- src/conf_mode/service_mdns_repeater.py | 146 +++++++++++++++++++++++++++++++++ 1 file changed, 146 insertions(+) create mode 100755 src/conf_mode/service_mdns_repeater.py (limited to 'src/conf_mode/service_mdns_repeater.py') diff --git a/src/conf_mode/service_mdns_repeater.py b/src/conf_mode/service_mdns_repeater.py new file mode 100755 index 000000000..6526c23d1 --- /dev/null +++ b/src/conf_mode/service_mdns_repeater.py @@ -0,0 +1,146 @@ +#!/usr/bin/env python3 +# +# Copyright (C) 2017-2022 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 . + +import os + +from json import loads +from sys import exit +from netifaces import ifaddresses, interfaces, AF_INET, AF_INET6 + +from vyos.config import Config +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']: + if interface not in interfaces(): + raise ConfigError(f'Interface "{interface}" does not exist!') + + 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) -- cgit v1.2.3