Create AvahiAlias (python3 version of avahi-alias) class file

AvahiAlias

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+#!/usr/bin/env python3
+import dbus
+import time
+import sys
+
+from encodings.idna import ToASCII
+
+
+class AvahiAliases:
+    def __init__(self):
+        self.CLASS_IN = 0x01
+        self.TYPE_CNAME = 0x05
+        self.TTL = 60
+        self.DBUS_NAME = 'org.freedesktop.Avahi'
+        self.DBUS_PATH_SERVER = '/'
+        self.DBUS_INTERFACE_SERVER = self.DBUS_NAME + '.Server'
+        self.DBUS_INTERFACE_ENTRY_GROUP = self.DBUS_NAME + '.EntryGroup'
+        self.IF_UNSPEC = -1
+        self.PROTO_UNSPEC = -1
+
+    def publish_cname(self, cname):
+        bus = dbus.SystemBus()
+        server = dbus.Interface(bus.get_object(self.DBUS_NAME, self.DBUS_PATH_SERVER),
+                                self.DBUS_INTERFACE_SERVER)
+        group = dbus.Interface(bus.get_object(self.DBUS_NAME, server.EntryGroupNew()),
+                               self.DBUS_INTERFACE_ENTRY_GROUP)
+
+        rdata = self.create_rr(server.GetHostNameFqdn())
+        cname = self.encode_dns(cname)
+
+        group.AddRecord(self.IF_UNSPEC, self.PROTO_UNSPEC, dbus.UInt32(0),
+                        cname, self.CLASS_IN, self.TYPE_CNAME, self.TTL, rdata)
+        group.Commit()
+        print("Published " + cname.decode())
+
+    @staticmethod
+    def encode_dns(name):
+        out = []
+        name = name.decode()
+        for part in str(name).split('.'):
+            if len(part) == 0:
+                continue
+            out.append(ToASCII(part))
+        return b'.'.join(out)
+
+    @staticmethod
+    def create_rr(name):
+        out = []
+        for part in name.split('.'):
+            if len(part) == 0:
+                continue
+            out.append(chr(len(part)).encode())
+            out.append(ToASCII(part))
+        out.append(b'\0')
+
+        return b''.join(out)
+
+
+if __name__ == '__main__':
+    avahi_aliases = AvahiAliases()
+    for each in sys.argv[1:]:
+        avahi_aliases.publish_cname(str(each).encode("utf-8", "strict"))
+
+    try:
+        while True:
+            time.sleep(60)
+    except KeyboardInterrupt:
+        print("Exiting")