Implement credential-safe programs smoke gate (#97)

crates/libremetaverse/src/agent_movement.rs

@@ -1256,11 +1256,13 @@ impl AgentMovementRuntime {
         packet.agent_data.agent_id = agent_id;
         packet.agent_data.session_id = session_id;
         packet.agent_data.circuit_code = self.network.native_circuit_code();
+        // The reference packet constructor marks this final region transition
+        // reliable; OpenSim may never publish the scene if this datagram is lost.
         send_encoded(
             &simulator,
             PacketType::CompleteAgentMovement,
             packet.to_bytes_with_method()?,
-            None,
+            Some(true),
         )
     }
 
@@ -2914,7 +2916,7 @@ mod tests {
             let socket =
                 UdpSocket::bind(SocketAddr::new(IpAddr::V4(Ipv4Addr::LOCALHOST), 0)).unwrap();
             socket
-                .set_read_timeout(Some(Duration::from_millis(100)))
+                .set_read_timeout(Some(Duration::from_secs(3)))
                 .unwrap();
             let endpoint = socket.local_addr().unwrap();
             let (packet_sender, packets) = mpsc::channel();
@@ -2934,6 +2936,9 @@ mod tests {
                 let mut bytes = handshake.to_bytes_with_method().unwrap();
                 bytes[0] &= !(crate::Helpers::MSG_RELIABLE | crate::Helpers::MSG_ZEROCODED);
                 socket.send_to(&bytes, client_endpoint).unwrap();
+                socket
+                    .set_read_timeout(Some(Duration::from_millis(100)))
+                    .unwrap();
 
                 loop {
                     match shutdown_receiver.try_recv() {
@@ -3074,7 +3079,19 @@ mod tests {
             .native_connect(grid.endpoint, 0x1000, true, None, 256, 256)
             .unwrap()
             .unwrap();
-        let _ = grid.receive(PacketType::CompleteAgentMovement);
+        let initial_complete = grid.receive(PacketType::CompleteAgentMovement);
+        assert_ne!(
+            initial_complete[0] & crate::Helpers::MSG_RELIABLE,
+            0,
+            "the simulator transition must survive UDP startup loss"
+        );
+        manager.complete_agent_movement(simulator.clone()).unwrap();
+        let repeated_complete = grid.receive(PacketType::CompleteAgentMovement);
+        assert_ne!(
+            repeated_complete[0] & crate::Helpers::MSG_RELIABLE,
+            0,
+            "explicit simulator transitions must be reliable"
+        );
 
         let mut complete = AgentMovementCompletePacket::new_with_constructor().unwrap();
         complete.data.position = Vector3 {