src/de/steamwar/bungeecore/listeners/mods/FMLPing.java

@@ -21,14 +21,17 @@ package de.steamwar.bungeecore.listeners.mods;
 import net.md_5.bungee.api.ServerPing;
 
 import java.util.ArrayList;
+import java.util.LinkedHashMap;
 import java.util.List;
+import java.util.Map;
 
 public class FMLPing extends ServerPing {
 
-    private final ForgeData forgeData = new ForgeData();
+    private final ForgeData forgeData;
 
-    public FMLPing(ServerPing existing) {
+    public FMLPing(ServerPing existing, int version) {
         super(existing.getVersion(), existing.getPlayers(), existing.getDescriptionComponent(), existing.getFaviconObject());
+        forgeData = new ForgeData(version);
     }
 
     private static class ForgeData {
@@ -36,14 +39,51 @@ public class FMLPing extends ServerPing {
         private final List<ForgeMod>     mods     = new ArrayList<>();
         private final int fmlNetworkVersion = 2;
 
-        public ForgeData() {
+        public ForgeData(int versionNumber) {
             channels.add(new ForgeChannel("minecraft:unregister"));
             channels.add(new ForgeChannel("minecraft:register"));
             channels.add(new ForgeChannel("fml:handshake"));
-            mods.add(new ForgeMod("minecraft", "1.15.2"));
+            mods.add(new ForgeMod("minecraft", ProtocolVersion.getVersion(versionNumber).toString()));
             mods.add(new ForgeMod("forge", "ANY"));
         }
 
+        public enum ProtocolVersion {
+            MINECRAFT_1_18(757),
+            MINECRAFT_1_17_1(756),
+            MINECRAFT_1_16_5(754),
+            MINECRAFT_1_15_2(578),
+            MINECRAFT_1_14_4(498),
+            MINECRAFT_1_13(393),
+            UNKNOWN(0);
+
+            private int number;
+
+            ProtocolVersion(int versionNumber) {
+                this.number = versionNumber;
+            }
+
+            private static Map<Integer, ProtocolVersion> numbers;
+
+            static {
+                numbers = new LinkedHashMap<>();
+                for(ProtocolVersion version : values()) {
+                    numbers.put(version.number, version);
+                }
+            }
+
+            public static ProtocolVersion getVersion(int versionNumber) {
+                ProtocolVersion protocolVersion = numbers.get(versionNumber);
+                if (protocolVersion != null) {
+                    return protocolVersion;
+                }
+                return UNKNOWN;
+            }
+
+            public String toString() {
+                return name().replace("MINECRAFT_", "").replace("_", ".");
+            }
+        }
+
         private static class ForgeChannel {
             private final String res;
             private final String version = "FML2";

src/de/steamwar/bungeecore/listeners/mods/Forge.java

@@ -55,7 +55,7 @@ public class Forge extends BasicListener {
 
     @EventHandler
     public void onServerPing(ProxyPingEvent event) {
-        event.setResponse(new FMLPing(event.getResponse()));
+        event.setResponse(new FMLPing(event.getResponse(), event.getConnection().getVersion()));
     }
 
     @EventHandler