The server now sends the world seed to players on login.

src/main/java/com/github/lunatrius/ingameinfo/InGameInfoXML.java

@@ -2,6 +2,7 @@
 
 import com.github.lunatrius.core.version.VersionChecker;
 import com.github.lunatrius.ingameinfo.handler.ConfigurationHandler;
+import com.github.lunatrius.ingameinfo.network.PacketHandler;
 import com.github.lunatrius.ingameinfo.proxy.CommonProxy;
 import com.github.lunatrius.ingameinfo.reference.Reference;
 import cpw.mods.fml.common.Mod;
@@ -19,7 +20,7 @@ public class InGameInfoXML {
     @Instance(Reference.MODID)
     public static InGameInfoXML instance;
 
-    @SidedProxy(serverSide = Reference.PROXY_COMMON, clientSide = Reference.PROXY_CLIENT)
+    @SidedProxy(serverSide = Reference.PROXY_SERVER, clientSide = Reference.PROXY_CLIENT)
     public static CommonProxy proxy;
 
     @EventHandler
@@ -34,6 +35,7 @@ public void preInit(FMLPreInitializationEvent event) {
 
     @EventHandler
     public void init(FMLInitializationEvent event) {
+        PacketHandler.init();
         proxy.registerEvents();
         proxy.registerCommands();
     }

src/main/java/com/github/lunatrius/ingameinfo/handler/PlayerHandler.java

@@ -0,0 +1,21 @@
+package com.github.lunatrius.ingameinfo.handler;
+
+import com.github.lunatrius.ingameinfo.network.PacketHandler;
+import com.github.lunatrius.ingameinfo.network.message.MessageSeed;
+import com.github.lunatrius.ingameinfo.reference.Reference;
+import cpw.mods.fml.common.eventhandler.SubscribeEvent;
+import cpw.mods.fml.common.gameevent.PlayerEvent;
+import net.minecraft.entity.player.EntityPlayerMP;
+
+public class PlayerHandler {
+    @SubscribeEvent
+    public void onPlayerLogin(PlayerEvent.PlayerLoggedInEvent event) {
+        if (event.player instanceof EntityPlayerMP) {
+            try {
+                PacketHandler.INSTANCE.sendTo(new MessageSeed(event.player.worldObj.getSeed()), (EntityPlayerMP) event.player);
+            } catch (Exception ex) {
+                Reference.logger.error("Failed to send the seed!", ex);
+            }
+        }
+    }
+}

src/main/java/com/github/lunatrius/ingameinfo/network/PacketHandler.java

@@ -0,0 +1,15 @@
+package com.github.lunatrius.ingameinfo.network;
+
+import com.github.lunatrius.ingameinfo.network.message.MessageSeed;
+import com.github.lunatrius.ingameinfo.reference.Reference;
+import cpw.mods.fml.common.network.NetworkRegistry;
+import cpw.mods.fml.common.network.simpleimpl.SimpleNetworkWrapper;
+import cpw.mods.fml.relauncher.Side;
+
+public class PacketHandler {
+    public static final SimpleNetworkWrapper INSTANCE = NetworkRegistry.INSTANCE.newSimpleChannel(Reference.MODID.toLowerCase());
+
+    public static void init() {
+        INSTANCE.registerMessage(MessageSeed.class, MessageSeed.class, 0, Side.CLIENT);
+    }
+}

src/main/java/com/github/lunatrius/ingameinfo/network/message/MessageSeed.java

@@ -0,0 +1,39 @@
+package com.github.lunatrius.ingameinfo.network.message;
+
+import com.github.lunatrius.ingameinfo.tag.Tag;
+import cpw.mods.fml.common.network.simpleimpl.IMessage;
+import cpw.mods.fml.common.network.simpleimpl.IMessageHandler;
+import cpw.mods.fml.common.network.simpleimpl.MessageContext;
+import cpw.mods.fml.relauncher.Side;
+import io.netty.buffer.ByteBuf;
+
+public class MessageSeed implements IMessage, IMessageHandler<MessageSeed, IMessage> {
+    public long seed;
+
+    public MessageSeed() {
+        this.seed = 0;
+    }
+
+    public MessageSeed(long seed) {
+        this.seed = seed;
+    }
+
+    @Override
+    public void fromBytes(ByteBuf buf) {
+        this.seed = buf.readLong();
+    }
+
+    @Override
+    public void toBytes(ByteBuf buf) {
+        buf.writeLong(this.seed);
+    }
+
+    @Override
+    public IMessage onMessage(MessageSeed message, MessageContext ctx) {
+        if (ctx.side == Side.CLIENT) {
+            Tag.setSeed(message.seed);
+        }
+
+        return null;
+    }
+}

src/main/java/com/github/lunatrius/ingameinfo/proxy/ServerProxy.java

@@ -0,0 +1,11 @@
+package com.github.lunatrius.ingameinfo.proxy;
+
+import com.github.lunatrius.ingameinfo.handler.PlayerHandler;
+import cpw.mods.fml.common.FMLCommonHandler;
+
+public class ServerProxy extends CommonProxy {
+    @Override
+    public void registerEvents() {
+        FMLCommonHandler.instance().bus().register(new PlayerHandler());
+    }
+}

src/main/java/com/github/lunatrius/ingameinfo/reference/Reference.java

@@ -9,7 +9,7 @@ public class Reference {
     public static final String VERSION = "${version}";
     public static final String FORGE = "${forgeversion}";
     public static final String MINECRAFT = "${mcversion}";
-    public static final String PROXY_COMMON = "com.github.lunatrius.ingameinfo.proxy.CommonProxy";
+    public static final String PROXY_SERVER = "com.github.lunatrius.ingameinfo.proxy.ServerProxy";
     public static final String PROXY_CLIENT = "com.github.lunatrius.ingameinfo.proxy.ClientProxy";
     public static final String GUI_FACTORY = "com.github.lunatrius.ingameinfo.client.gui.GuiFactory";