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authorChristian Breunig <christian@breunig.cc>2023-12-30 23:25:20 +0100
committerChristian Breunig <christian@breunig.cc>2024-01-01 09:25:32 +0100
commitc9eaafd9f808aba8d29be73054e11d37577e539a (patch)
treeaeccfda0a305cf6aca41630900e75bd32961a911 /src/conf_mode/service_mdns_repeater.py
parent2078253176046ea4d07e69caeb7932ea439b5614 (diff)
downloadvyos-1x-c9eaafd9f808aba8d29be73054e11d37577e539a.tar.gz
vyos-1x-c9eaafd9f808aba8d29be73054e11d37577e539a.zip
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)
Diffstat (limited to 'src/conf_mode/service_mdns_repeater.py')
-rwxr-xr-xsrc/conf_mode/service_mdns_repeater.py146
1 files changed, 146 insertions, 0 deletions
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 <http://www.gnu.org/licenses/>.
+
+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)