1 files changed, 132 insertions, 0 deletions
diff --git a/EssentialsAntiCheat/src/com/earth2me/essentials/anticheat/checks/moving/MorePacketsCheck.java b/EssentialsAntiCheat/src/com/earth2me/essentials/anticheat/checks/moving/MorePacketsCheck.java
new file mode 100644
index 000000000..d5ae30340
--- /dev/null
+++ b/EssentialsAntiCheat/src/com/earth2me/essentials/anticheat/checks/moving/MorePacketsCheck.java
@@ -0,0 +1,132 @@
+package com.earth2me.essentials.anticheat.checks.moving;
+
+import com.earth2me.essentials.anticheat.NoCheat;
+import com.earth2me.essentials.anticheat.NoCheatPlayer;
+import com.earth2me.essentials.anticheat.actions.ParameterName;
+import com.earth2me.essentials.anticheat.data.PreciseLocation;
+import com.earth2me.essentials.anticheat.data.Statistics.Id;
+import java.util.Locale;
+
+
+/**
+ * The morePacketsCheck (previously called SpeedhackCheck) will try to identify players that send more than the usual
+ * amount of move-packets to the server to be able to move faster than normal, without getting caught by the other
+ * checks (flying/running).
+ *
+ * It monitors the number of packets sent to the server within 1 second and compares it to the "legal" number of packets
+ * for that timeframe (22).
+ *
+ */
+public class MorePacketsCheck extends MovingCheck
+{
+	// 20 would be for perfect internet connections, 22 is good enough
+	private final static int packetsPerTimeframe = 22;
+
+	public MorePacketsCheck(NoCheat plugin)
+	{
+		super(plugin, "moving.morepackets");
+	}
+
+	/**
+	 * 1. Players get assigned a certain amount of "free" packets as a limit initially 2. Every move packet reduces that
+	 * limit by 1 3. If more than 1 second of time passed, the limit gets increased by 22 * time in seconds, up to 50
+	 * and he gets a new "setback" location 4. If the player reaches limit = 0 -> teleport him back to "setback" 5. If
+	 * there was a long pause (maybe lag), limit may be up to 100
+	 *
+	 */
+	public PreciseLocation check(NoCheatPlayer player, MovingData data, MovingConfig cc)
+	{
+
+		PreciseLocation newToLocation = null;
+
+		if (!data.morePacketsSetbackPoint.isSet())
+		{
+			data.morePacketsSetbackPoint.set(data.from);
+		}
+
+		long time = System.currentTimeMillis();
+
+		// Take a packet from the buffer
+		data.morePacketsBuffer--;
+
+		// Player used up buffer, he fails the check
+		if (data.morePacketsBuffer < 0)
+		{
+
+			data.morePacketsVL = -data.morePacketsBuffer;
+			incrementStatistics(player, Id.MOV_MOREPACKETS, 1);
+
+			data.packets = -data.morePacketsBuffer;
+
+			// Execute whatever actions are associated with this check and the
+			// violation level and find out if we should cancel the event
+			final boolean cancel = executeActions(player, cc.morePacketsActions, data.morePacketsVL);
+
+			if (cancel)
+			{
+				newToLocation = data.morePacketsSetbackPoint;
+			}
+		}
+
+		if (data.morePacketsLastTime + 1000 < time)
+		{
+			// More than 1 second elapsed, but how many?
+			double seconds = ((double)(time - data.morePacketsLastTime)) / 1000D;
+
+			// For each second, fill the buffer
+			data.morePacketsBuffer += packetsPerTimeframe * seconds;
+
+			// If there was a long pause (maybe server lag?)
+			// Allow buffer to grow up to 100
+			if (seconds > 2)
+			{
+				if (data.morePacketsBuffer > 100)
+				{
+					data.morePacketsBuffer = 100;
+				}
+				// Else only allow growth up to 50
+			}
+			else
+			{
+				if (data.morePacketsBuffer > 50)
+				{
+					data.morePacketsBuffer = 50;
+				}
+			}
+
+			// Set the new "last" time
+			data.morePacketsLastTime = time;
+
+			// Set the new "setback" location
+			if (newToLocation == null)
+			{
+				data.morePacketsSetbackPoint.set(data.from);
+			}
+		}
+		else if (data.morePacketsLastTime > time)
+		{
+			// Security check, maybe system time changed
+			data.morePacketsLastTime = time;
+		}
+
+		return newToLocation;
+	}
+
+	@Override
+	public String getParameter(ParameterName wildcard, NoCheatPlayer player)
+	{
+
+		if (wildcard == ParameterName.VIOLATIONS)
+		{
+			return String.format(Locale.US, "%d", (int)getData(player).morePacketsVL);
+		}
+		else if (wildcard == ParameterName.PACKETS)
+		{
+			return String.format(Locale.US, "%d", getData(player).packets);
+		}
+		else
+		{
+			return super.getParameter(wildcard, player);
+		}
+	}
+}