mdns-repeater: T2742: migrate to get_config_dict()

1 files changed, 89 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..1a6b2c328
--- /dev/null
+++ b/src/conf_mode/service_mdns-repeater.py
@@ -0,0 +1,89 @@
+#!/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 netifaces import ifaddresses, interfaces, AF_INET
+
+from vyos.config import Config
+from vyos.template import render
+from vyos.util import call
+from vyos import ConfigError
+from vyos import airbag
+airbag.enable()
+
+config_file = r'/etc/default/mdns-repeater'
+
+def get_config():
+    conf = Config()
+    base = ['service', 'mdns', 'repeater']
+    mdns = conf.get_config_dict(base, key_mangling=('-', '_'), get_first_key=True)
+    return mdns
+
+def verify(mdns):
+    if not mdns:
+        return None
+
+    if '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 AF_INET not in ifaddresses(interface):
+            raise ConfigError('mDNS repeater requires an IPv4 address to be '
+                                  f'configured on interface "{interface}"')
+
+    return None
+
+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
+
+    render(config_file, 'mdns-repeater/mdns-repeater.tmpl', mdns)
+    return None
+
+def apply(mdns):
+    if not mdns or 'disable' in mdns:
+        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)