close connection instead of relaying the message after kill gets called from tcp_message

Author: thanodnl

mitmproxy/proxy/layers/tcp.py

@@ -107,7 +107,10 @@ def relay_messages(self, event: events.Event) -> layer.CommandGenerator[None]:
                 tcp_message = tcp.TCPMessage(from_client, event.data)
                 self.flow.messages.append(tcp_message)
                 yield TcpMessageHook(self.flow)
-                yield commands.SendData(send_to, tcp_message.content)
+                if self.flow.live:
+                    yield commands.SendData(send_to, tcp_message.content)
+                else:
+                    yield commands.CloseConnection(send_to, half_close=True)
             else:
                 yield commands.SendData(send_to, event.data)