Packet rate limit

core/src/mindustry/net/Administration.java

@@ -676,7 +676,7 @@ public class Administration{
     }
 
     public enum ActionType{
-        breakBlock, placeBlock, rotate, configure, withdrawItem, depositItem, control, buildSelect, command, removePlanned, commandUnits, commandBuilding
+        breakBlock, placeBlock, rotate, configure, withdrawItem, depositItem, control, buildSelect, command, removePlanned, commandUnits, commandBuilding, respawn
     }
 
 }

core/src/mindustry/net/ArcNetProvider.java

@@ -137,6 +137,13 @@ public class ArcNetProvider implements NetProvider{
                 ArcConnection k = getByArcID(connection.getID());
                 if(!(object instanceof Packet pack) || k == null) return;
 
+                if(!k.packetRate.allow(3000, 270)){
+                    Log.warn("Blacklisting IP '@' as potential DOS attack - packet spam.", k.address);
+                    connection.close(DcReason.closed);
+                    netServer.admins.blacklistDos(k.address);
+                    return;
+                }
+
                 Core.app.post(() -> {
                     try{
                         net.handleServerReceived(k, pack);

core/src/mindustry/net/NetConnection.java

@@ -30,6 +30,8 @@ public abstract class NetConnection{
     public Seq<BuildPlan> rejectedRequests = new Seq<>();
     /** Handles chat spam rate limits. */
     public Ratekeeper chatRate = new Ratekeeper();
+    /** Handles packet spam rate limits. */
+    public Ratekeeper packetRate = new Ratekeeper();
 
     public boolean hasConnected, hasBegunConnecting, hasDisconnected;
     public float viewWidth, viewHeight, viewX, viewY;