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| 1 | +/* |
| 2 | + * Copyright (c) 2014-2026 Wurst-Imperium and contributors. |
| 3 | + * |
| 4 | + * This source code is subject to the terms of the GNU General Public |
| 5 | + * License, version 3. If a copy of the GPL was not distributed with this |
| 6 | + * file, You can obtain one at: https://www.gnu.org/licenses/gpl-3.0.txt |
| 7 | + */ |
| 8 | +package net.wurstclient.hacks; |
| 9 | + |
| 10 | +import java.util.ArrayDeque; |
| 11 | +import net.minecraft.client.multiplayer.ClientPacketListener; |
| 12 | +import net.minecraft.network.protocol.Packet; |
| 13 | +import net.wurstclient.Category; |
| 14 | +import net.wurstclient.SearchTags; |
| 15 | +import net.wurstclient.events.PacketInputListener; |
| 16 | +import net.wurstclient.events.PacketInputListener.PacketInputEvent; |
| 17 | +import net.wurstclient.events.PacketOutputListener; |
| 18 | +import net.wurstclient.events.PacketOutputListener.PacketOutputEvent; |
| 19 | +import net.wurstclient.events.UpdateListener; |
| 20 | +import net.wurstclient.hack.Hack; |
| 21 | +import net.wurstclient.settings.CheckboxSetting; |
| 22 | +import net.wurstclient.settings.SliderSetting; |
| 23 | +import net.wurstclient.settings.SliderSetting.ValueDisplay; |
| 24 | + |
| 25 | +@SearchTags({"LagSwitch", "lag switch"}) |
| 26 | +public final class PacketDelayHack extends Hack |
| 27 | + implements UpdateListener, PacketInputListener, PacketOutputListener |
| 28 | +{ |
| 29 | + private final CheckboxSetting delayS2c = new CheckboxSetting("Delay S2C", |
| 30 | + "Delays incoming server packets.", true); |
| 31 | + private final CheckboxSetting delayC2s = new CheckboxSetting("Delay C2S", |
| 32 | + "Delays outgoing client packets.", true); |
| 33 | + private final CheckboxSetting timeDelay = new CheckboxSetting("Time delay", |
| 34 | + "Release queued packets once the delay has passed.", false); |
| 35 | + private final SliderSetting delay = new SliderSetting("Delay", |
| 36 | + "How long to wait in ticks before releasing queued packets.", 0, 0, 200, |
| 37 | + 1, ValueDisplay.INTEGER); |
| 38 | + |
| 39 | + private final ArrayDeque<PacketAndTime> s2cQueue = new ArrayDeque<>(); |
| 40 | + private final ArrayDeque<PacketAndTime> c2sQueue = new ArrayDeque<>(); |
| 41 | + private boolean flushingC2s; |
| 42 | + |
| 43 | + public PacketDelayHack() |
| 44 | + { |
| 45 | + super("PacketDelay"); |
| 46 | + setCategory(Category.OTHER); |
| 47 | + addSetting(delayS2c); |
| 48 | + addSetting(delayC2s); |
| 49 | + addSetting(timeDelay); |
| 50 | + addSetting(delay); |
| 51 | + } |
| 52 | + |
| 53 | + @Override |
| 54 | + public String getRenderName() |
| 55 | + { |
| 56 | + int total = s2cQueue.size() + c2sQueue.size(); |
| 57 | + return getName() + " [" + total + "]"; |
| 58 | + } |
| 59 | + |
| 60 | + @Override |
| 61 | + protected void onEnable() |
| 62 | + { |
| 63 | + s2cQueue.clear(); |
| 64 | + c2sQueue.clear(); |
| 65 | + |
| 66 | + EVENTS.add(UpdateListener.class, this); |
| 67 | + EVENTS.add(PacketInputListener.class, this); |
| 68 | + EVENTS.add(PacketOutputListener.class, this); |
| 69 | + } |
| 70 | + |
| 71 | + @Override |
| 72 | + protected void onDisable() |
| 73 | + { |
| 74 | + EVENTS.remove(UpdateListener.class, this); |
| 75 | + EVENTS.remove(PacketInputListener.class, this); |
| 76 | + EVENTS.remove(PacketOutputListener.class, this); |
| 77 | + |
| 78 | + flushQueues(true); |
| 79 | + } |
| 80 | + |
| 81 | + @Override |
| 82 | + public void onUpdate() |
| 83 | + { |
| 84 | + if(timeDelay.isChecked()) |
| 85 | + flushQueues(false); |
| 86 | + } |
| 87 | + |
| 88 | + @Override |
| 89 | + public void onReceivedPacket(PacketInputEvent event) |
| 90 | + { |
| 91 | + if(!delayS2c.isChecked()) |
| 92 | + return; |
| 93 | + |
| 94 | + long time = MC.level != null ? MC.level.getGameTime() : 0; |
| 95 | + s2cQueue.addLast(new PacketAndTime(event.getPacket(), time)); |
| 96 | + event.cancel(); |
| 97 | + } |
| 98 | + |
| 99 | + @Override |
| 100 | + public void onSentPacket(PacketOutputEvent event) |
| 101 | + { |
| 102 | + if(flushingC2s || !delayC2s.isChecked()) |
| 103 | + return; |
| 104 | + |
| 105 | + long time = MC.level != null ? MC.level.getGameTime() : 0; |
| 106 | + c2sQueue.addLast(new PacketAndTime(event.getPacket(), time)); |
| 107 | + event.cancel(); |
| 108 | + } |
| 109 | + |
| 110 | + private void flushQueues(boolean forceAll) |
| 111 | + { |
| 112 | + if(forceAll || delay.getValueI() <= 0) |
| 113 | + forceAll = true; |
| 114 | + |
| 115 | + long now = MC.level != null ? MC.level.getGameTime() : 0; |
| 116 | + |
| 117 | + if(forceAll || shouldReleaseQueue(s2cQueue, now, delay.getValueI())) |
| 118 | + { |
| 119 | + while(!s2cQueue.isEmpty()) |
| 120 | + applyPacket(s2cQueue.removeFirst().packet); |
| 121 | + } |
| 122 | + |
| 123 | + if(forceAll || shouldReleaseQueue(c2sQueue, now, delay.getValueI())) |
| 124 | + { |
| 125 | + sendQueuedPackets(); |
| 126 | + } |
| 127 | + } |
| 128 | + |
| 129 | + private boolean shouldReleaseQueue(ArrayDeque<PacketAndTime> queue, |
| 130 | + long now, int delayTicks) |
| 131 | + { |
| 132 | + if(queue.isEmpty()) |
| 133 | + return false; |
| 134 | + |
| 135 | + return queue.peekFirst().time <= now - delayTicks; |
| 136 | + } |
| 137 | + |
| 138 | + private void sendQueuedPackets() |
| 139 | + { |
| 140 | + if(c2sQueue.isEmpty()) |
| 141 | + return; |
| 142 | + |
| 143 | + ClientPacketListener connection = MC.getConnection(); |
| 144 | + if(connection == null) |
| 145 | + { |
| 146 | + c2sQueue.clear(); |
| 147 | + return; |
| 148 | + } |
| 149 | + |
| 150 | + flushingC2s = true; |
| 151 | + try |
| 152 | + { |
| 153 | + while(!c2sQueue.isEmpty()) |
| 154 | + connection.send(c2sQueue.removeFirst().packet); |
| 155 | + |
| 156 | + }finally |
| 157 | + { |
| 158 | + flushingC2s = false; |
| 159 | + } |
| 160 | + } |
| 161 | + |
| 162 | + private void applyPacket(Packet<?> packet) |
| 163 | + { |
| 164 | + ClientPacketListener connection = MC.getConnection(); |
| 165 | + if(connection == null) |
| 166 | + return; |
| 167 | + |
| 168 | + @SuppressWarnings("unchecked") |
| 169 | + Packet<ClientPacketListener> typedPacket = |
| 170 | + (Packet<ClientPacketListener>)packet; |
| 171 | + typedPacket.handle(connection); |
| 172 | + } |
| 173 | + |
| 174 | + private static class PacketAndTime |
| 175 | + { |
| 176 | + private final Packet<?> packet; |
| 177 | + private final long time; |
| 178 | + |
| 179 | + private PacketAndTime(Packet<?> packet, long time) |
| 180 | + { |
| 181 | + this.packet = packet; |
| 182 | + this.time = time; |
| 183 | + } |
| 184 | + } |
| 185 | +} |
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