1 files changed, 107 insertions, 0 deletions
diff --git a/src/conf_mode/bcast_relay.py b/src/conf_mode/bcast_relay.py
new file mode 100755
index 000000000..a3e141a00
--- /dev/null
+++ b/src/conf_mode/bcast_relay.py
@@ -0,0 +1,107 @@
+#!/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 glob import glob
+from netifaces import interfaces
+from sys import exit
+
+from vyos.config import Config
+from vyos.util import call
+from vyos.template import render
+from vyos import ConfigError
+from vyos import airbag
+airbag.enable()
+
+config_file_base = r'/etc/default/udp-broadcast-relay'
+
+def get_config():
+    conf = Config()
+    base = ['service', 'broadcast-relay']
+
+    relay = conf.get_config_dict(base, key_mangling=('-', '_'), get_first_key=True)
+    return relay
+
+def verify(relay):
+    if not relay or 'disabled' in relay:
+        return None
+
+    for instance, config in relay.get('id', {}).items():
+        # we don't have to check this instance when it's disabled
+        if 'disabled' in config:
+            continue
+
+        # we certainly require a UDP port to listen to
+        if 'port' not in config:
+            raise ConfigError(f'Port number mandatory for udp broadcast relay "{instance}"')
+
+        # if only oone interface is given it's a string -> move to list
+        if isinstance(config.get('interface', []), str):
+            config['interface'] = [ config['interface'] ]
+        # Relaying data without two interface is kinda senseless ...
+        if len(config.get('interface', [])) < 2:
+            raise ConfigError('At least two interfaces are required for udp broadcast relay "{instance}"')
+
+        for interface in config.get('interface', []):
+            if interface not in interfaces():
+                raise ConfigError('Interface "{interface}" does not exist!')
+
+    return None
+
+def generate(relay):
+    if not relay or 'disabled' in relay:
+        return None
+
+    for config in glob(config_file_base + '*'):
+        os.remove(config)
+
+    for instance, config in relay.get('id').items():
+        # we don't have to check this instance when it's disabled
+        if 'disabled' in config:
+            continue
+
+        config['instance'] = instance
+        render(config_file_base + instance, 'bcast-relay/udp-broadcast-relay.tmpl', config)
+
+    return None
+
+def apply(relay):
+    # first stop all running services
+    call('systemctl stop udp-broadcast-relay@*.service')
+
+    if not relay or 'disable' in relay:
+        return None
+
+    # start only required service instances
+    for instance, config in relay.get('id').items():
+        # we don't have to check this instance when it's disabled
+        if 'disabled' in config:
+            continue
+
+        call(f'systemctl start udp-broadcast-relay@{instance}.service')
+
+    return None
+
+if __name__ == '__main__':
+    try:
+        c = get_config()
+        verify(c)
+        generate(c)
+        apply(c)
+    except ConfigError as e:
+        print(e)
+        exit(1)