Add 'vyos-update-mdns-repeater.py' functionality

1 files changed, 97 insertions, 0 deletions

diff --git a/src/conf-mode/vyos-config-mdns-repeater.py b/src/conf-mode/vyos-config-mdns-repeater.py
new file mode 100755
index 000000000..3f9eb1b2b
--- /dev/null
+++ b/src/conf-mode/vyos-config-mdns-repeater.py
@@ -0,0 +1,97 @@
+#!/usr/bin/env python3
+#
+# Copyright (C) 2017 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 sys
+import os
+import netifaces
+import time
+import subprocess
+
+from vyos.config import Config
+from vyos.util import ConfigError
+
+config_file = r'/etc/default/mdns-repeater'
+
+def get_config():
+    interface_list = []
+
+    conf = Config()
+    conf.set_level('service mdns repeater')
+    if not conf.exists(''):
+        return interface_list
+
+    if conf.exists('interfaces'):
+        intfs_names = conf.return_values('interfaces')
+        intfs_names=intfs_names.replace("'", "")
+        intfs_names=intfs_names.split()
+
+        for name in intfs_names:
+            interface_list.append(name)
+
+    return interface_list
+
+def verify(mdns):
+    # '0' interfaces are possible, think of service deletion. Only '1' is not supported!
+    if len(mdns) == 1:
+        raise ConfigError('At least 2 interfaces must be specified but %d given!' % len(mdns))
+
+    # For mdns-repeater to work it is essential that the interfaces
+    # have an IP address assigned
+    for intf in mdns:
+        try:
+            netifaces.ifaddresses(intf)[netifaces.AF_INET]
+        except KeyError as e:
+            raise ConfigError('No IP address configured for interface "%s"!' % intf)
+
+    return None
+
+def generate(mdns):
+    config_header = '### Autogenerated by vyos-update-mdns-repeater.py on {tm} ###\n'.format(tm=time.strftime("%a, %d %b %Y %H:%M:%S", time.localtime()))
+    if len(mdns) > 0:
+        config_args = 'DAEMON_ARGS="' + ' '.join(str(e) for e in mdns) + '"\n'
+    else:
+        config_args = 'DAEMON_ARGS=""\n'
+
+    # write new configuration file
+    f = open(config_file, 'w')
+    f.write(config_header)
+    f.write(config_args)
+    f.close()
+
+    return None
+
+def apply(mdns):
+    systemd_cmd = ["sudo", "service", "mdns-repeater"]
+
+    if len(mdns) == 0:
+        systemd_cmd.append("stop")
+    else:
+        systemd_cmd.append("restart")
+
+    subprocess.call(systemd_cmd)
+    return None
+
+if __name__ == '__main__':
+    try:
+        c = get_config()
+        verify(c)
+        generate(c)
+        apply(c)
+    except ConfigError as e:
+        print(e)
+        sys.exit(1)