Allow tagging UDPPackets with arbitrary metadata

The metadata should propagate to any Messages deserialized
from the packet as well.

hippolyzer/lib/base/network/transport.py

@@ -30,6 +30,7 @@ class UDPPacket:
         self.dst_addr = dst_addr
         self.data = data
         self.direction = direction
+        self.meta = {}
 
     @property
     def outgoing(self):

hippolyzer/lib/proxy/lludp_proxy.py

@@ -58,6 +58,7 @@ class InterceptingLLUDPProxyProtocol(UDPProxyProtocol):
         message = self.deserializer.deserialize(packet.data)
         message.direction = packet.direction
         message.sender = packet.src_addr
+        message.meta.update(packet.meta)
 
         assert message is not None
         # Check for UDP bans on inbound messages