Minor network packet handling tweaks

core/src/mindustry/core/NetClient.java

@@ -86,7 +86,7 @@ public class NetClient implements ApplicationListener{
                 locale = Locale.getDefault().toString();
             }
 
-            ConnectPacket c = new ConnectPacket();
+            var c = new ConnectPacket();
             c.name = player.name;
             c.locale = locale;
             c.mods = mods.getModStrings();
@@ -188,6 +188,10 @@ public class NetClient implements ApplicationListener{
     //called when a server receives a chat message from a player
     @Remote(called = Loc.server, targets = Loc.client)
     public static void sendChatMessage(Player player, String message){
+
+        //do not receive chat messages from clients that are too young or not registered
+        if(Time.timeSinceMillis(player.con.connectTime) < 500 || !player.con.hasConnected || !player.isAdded()) return;
+
         if(message.length() > maxTextLength){
             throw new ValidateException(player, "Player has sent a message above the text limit.");
         }
@@ -198,7 +202,7 @@ public class NetClient implements ApplicationListener{
         CommandResponse response = netServer.clientCommands.handleMessage(message, player);
         if(response.type == ResponseType.noCommand){ //no command to handle
             message = netServer.admins.filterMessage(player, message);
-            //supress chat message if it's filtered out
+            //suppress chat message if it's filtered out
             if(message == null){
                 return;
             }

core/src/mindustry/core/NetServer.java

@@ -93,10 +93,14 @@ public class NetServer implements ApplicationListener{
         });
 
         net.handleServer(ConnectPacket.class, (con, packet) -> {
+            if(con.kicked) return;
+
             if(con.address.startsWith("steam:")){
                 packet.uuid = con.address.substring("steam:".length());
             }
 
+            con.connectTime = Time.millis();
+
             String uuid = packet.uuid;
             byte[] buuid = Base64Coder.decode(uuid);
             CRC32 crc = new CRC32();
@@ -249,7 +253,8 @@ public class NetServer implements ApplicationListener{
         });
 
         net.handleServer(InvokePacket.class, (con, packet) -> {
-            if(con.player == null) return;
+            if(con.player == null || con.kicked) return;
+
             try{
                 RemoteReadServer.readPacket(packet.reader(), packet.type, con.player);
             }catch(ValidateException e){
@@ -748,6 +753,8 @@ public class NetServer implements ApplicationListener{
 
     @Remote(targets = Loc.client)
     public static void connectConfirm(Player player){
+        if(player.con.kicked) return;
+
         player.add();
 
         if(player.con == null || player.con.hasConnected) return;

core/src/mindustry/net/NetConnection.java

@@ -19,6 +19,8 @@ public abstract class NetConnection{
     public @Nullable Player player;
     public boolean kicked = false;
 
+    /** When this connection was established. */
+    public long connectTime = Time.millis();
     /** ID of last received client snapshot. */
     public int lastReceivedClientSnapshot = -1;
     /** Timestamp of last received snapshot. */