Paper/nms-patches/PacketStatusListener.patch

--- a/net/minecraft/server/PacketStatusListener.java
+++ b/net/minecraft/server/PacketStatusListener.java
@@ -1,5 +1,16 @@
 package net.minecraft.server;
 
+// CraftBukkit start
+import com.mojang.authlib.GameProfile;
+import io.netty.channel.ChannelFutureListener;
+import java.net.InetSocketAddress;
+import java.util.Iterator;
+
+import org.bukkit.craftbukkit.util.CraftIconCache;
+import org.bukkit.entity.Player;
+
+// CraftBukkit end
+
 public class PacketStatusListener implements PacketStatusInListener {
 
     private final MinecraftServer minecraftServer;
@@ -12,11 +23,116 @@
 
     public void a(IChatBaseComponent ichatbasecomponent) {}
 
+    // CraftBukkit start
+    private static final int WAITING = 0;
+    private static final int PING = 1;
+    private static final int DONE = 2;
+    private int state = WAITING;
+    // CraftBukkit end
+
     public void a(PacketStatusInStart packetstatusinstart) {
-        this.networkManager.handle(new PacketStatusOutServerInfo(this.minecraftServer.aG()));
+        // this.networkManager.handle(new PacketStatusOutServerInfo(this.minecraftServer.aG()));
+        // CraftBukkit start - fire ping event
+        if (state != WAITING) {
+            networkManager.close(null);
+            return;
+        }
+        state = PING;
+        final Object[] players = minecraftServer.getPlayerList().players.toArray();
+        class ServerListPingEvent extends org.bukkit.event.server.ServerListPingEvent {
+            CraftIconCache icon = minecraftServer.server.getServerIcon();
+
+            ServerListPingEvent() {
+                super(((InetSocketAddress) networkManager.getSocketAddress()).getAddress(), minecraftServer.getMotd(), minecraftServer.getPlayerList().getMaxPlayers());
+            }
+
+            @Override
+            public void setServerIcon(org.bukkit.util.CachedServerIcon icon) {
+                if (!(icon instanceof CraftIconCache)) {
+                    throw new IllegalArgumentException(icon + " was not created by " + org.bukkit.craftbukkit.CraftServer.class);
+                }
+                this.icon = (CraftIconCache) icon;
+            }
+
+            @Override
+            public Iterator<Player> iterator() throws UnsupportedOperationException {
+                return new Iterator<Player>() {
+                    int i;
+                    int ret = Integer.MIN_VALUE;
+                    EntityPlayer player;
+
+                    @Override
+                    public boolean hasNext() {
+                        if (player != null) {
+                            return true;
+                        }
+                        final Object[] currentPlayers = players;
+                        for (int length = currentPlayers.length, i = this.i; i < length; i++) {
+                            final EntityPlayer player = (EntityPlayer) currentPlayers[i];
+                            if (player != null) {
+                                this.i = i + 1;
+                                this.player = player;
+                                return true;
+                            }
+                        }
+                        return false;
+                    }
+
+                    @Override
+                    public Player next() {
+                        if (!hasNext()) {
+                            throw new java.util.NoSuchElementException();
+                        }
+                        final EntityPlayer player = this.player;
+                        this.player = null;
+                        this.ret = this.i - 1;
+                        return player.getBukkitEntity();
+                    }
+
+                    @Override
+                    public void remove() {
+                        final Object[] currentPlayers = players;
+                        final int i = this.ret;
+                        if (i < 0 || currentPlayers[i] == null) {
+                            throw new IllegalStateException();
+                        }
+                        currentPlayers[i] = null;
+                    }
+                };
+            }
+        }
+
+        ServerListPingEvent event = new ServerListPingEvent();
+        this.minecraftServer.server.getPluginManager().callEvent(event);
+
+        java.util.List<GameProfile> profiles = new java.util.ArrayList<GameProfile>(players.length);
+        for (Object player : players) {
+            if (player != null) {
+                profiles.add(((EntityPlayer) player).getProfile());
+            }
+        }
+
+        ServerPing.ServerPingPlayerSample playerSample = new ServerPing.ServerPingPlayerSample(event.getMaxPlayers(), profiles.size());
+        playerSample.a(profiles.toArray(new GameProfile[profiles.size()]));
+
+        ServerPing ping = new ServerPing();
+        ping.setFavicon(event.icon.value);
+        ping.setMOTD(new ChatComponentText(event.getMotd()));
+        ping.setPlayerSample(playerSample);
+        ping.setServerInfo(new ServerPing.ServerData(minecraftServer.getServerModName() + " " + minecraftServer.getVersion(), 47)); // TODO: Update when protocol changes
+
+        this.networkManager.handle(new PacketStatusOutServerInfo(ping));
+        // CraftBukkit end
     }
 
     public void a(PacketStatusInPing packetstatusinping) {
-        this.networkManager.handle(new PacketStatusOutPong(packetstatusinping.a()));
+        // CraftBukkit start
+        if (state != PING) {
+            networkManager.close(null);
+            return;
+        }
+        state = DONE;
+        this.networkManager.a(new PacketStatusOutPong(packetstatusinping.a()), ChannelFutureListener.CLOSE); // Close on completion
+        // CraftBukkit end
     }
 }