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58 changes: 58 additions & 0 deletions
58
AnarchyExploitFixesFolia/src/main/java/me/xginko/aef/modules/packets/BigMessages.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,58 @@ | ||
| package me.xginko.aef.modules.packets; | ||
|
|
||
| import com.github.retrooper.packetevents.event.PacketListenerPriority; | ||
| import com.github.retrooper.packetevents.event.PacketReceiveEvent; | ||
| import com.github.retrooper.packetevents.netty.buffer.ByteBufHelper; | ||
| import com.github.retrooper.packetevents.protocol.packettype.PacketType; | ||
| import com.github.retrooper.packetevents.wrapper.PacketWrapper; | ||
|
|
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| import java.nio.charset.StandardCharsets; | ||
|
|
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| public class BigMessages extends PacketModule { | ||
|
|
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| private final int charLimit; | ||
| private final boolean log, kick; | ||
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| public BigMessages() { | ||
| super("patches.message-char-limit", PacketListenerPriority.HIGHEST); | ||
| config.addComment(configPath + ".enable", """ | ||
| Sets a character limit for command and message packets to prevent a lag exploit."""); | ||
| this.charLimit = config.getInt(configPath + ".max-characters", 512); | ||
| this.log = config.getBoolean(configPath + ".log", false); | ||
| this.kick = config.getBoolean(configPath + ".kick-player", false); | ||
| } | ||
|
|
||
| @Override | ||
| public boolean shouldEnable() { | ||
| return config.getBoolean(configPath + ".enable", true); | ||
| } | ||
|
|
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| @Override | ||
| public void onPacketReceive(PacketReceiveEvent event) { | ||
| if (event.isCancelled()) return; | ||
|
|
||
| if ( | ||
| event.getPacketType() == PacketType.Play.Client.CHAT_MESSAGE | ||
| || event.getPacketType() == PacketType.Play.Client.CHAT_COMMAND | ||
| || event.getPacketType() == PacketType.Play.Client.CHAT_COMMAND_UNSIGNED | ||
| ) { | ||
| if (isStringTooBig(new PacketWrapper<>(event))) { | ||
| event.setCancelled(true); | ||
| onCancel(log, kick, event.getUser()); | ||
| } | ||
| } | ||
| } | ||
|
|
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| private boolean isStringTooBig(PacketWrapper<?> packetWrapper) { | ||
| int strBufLen = packetWrapper.readVarInt(); | ||
|
|
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| // Check if the received encoded string buffer length is zero or longer than maximum allowed | ||
| if (strBufLen < 0 || strBufLen > charLimit * 4) { | ||
| return true; | ||
| } | ||
|
|
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| // The received string length is longer than maximum allowed | ||
| return ByteBufHelper.toString(packetWrapper.buffer, ByteBufHelper.readerIndex(packetWrapper.buffer), strBufLen, StandardCharsets.UTF_8) | ||
| .length() > charLimit; | ||
| } | ||
| } |
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58 changes: 58 additions & 0 deletions
58
AnarchyExploitFixesLegacy/src/main/java/me/xginko/aef/modules/packets/BigMessages.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,58 @@ | ||
| package me.xginko.aef.modules.packets; | ||
|
|
||
| import com.github.retrooper.packetevents.event.PacketListenerPriority; | ||
| import com.github.retrooper.packetevents.event.PacketReceiveEvent; | ||
| import com.github.retrooper.packetevents.netty.buffer.ByteBufHelper; | ||
| import com.github.retrooper.packetevents.protocol.packettype.PacketType; | ||
| import com.github.retrooper.packetevents.wrapper.PacketWrapper; | ||
|
|
||
| import java.nio.charset.StandardCharsets; | ||
|
|
||
| public class BigMessages extends PacketModule { | ||
|
|
||
| private final int charLimit; | ||
| private final boolean log, kick; | ||
|
|
||
| public BigMessages() { | ||
| super("patches.message-char-limit", PacketListenerPriority.HIGHEST); | ||
| config.addComment(configPath + ".enable", | ||
| "Sets a character limit for command and message packets to prevent a lag exploit."); | ||
| this.charLimit = config.getInt(configPath + ".max-characters", 512); | ||
| this.log = config.getBoolean(configPath + ".log", false); | ||
| this.kick = config.getBoolean(configPath + ".kick-player", false); | ||
| } | ||
|
|
||
| @Override | ||
| public boolean shouldEnable() { | ||
| return config.getBoolean(configPath + ".enable", true); | ||
| } | ||
|
|
||
| @Override | ||
| public void onPacketReceive(PacketReceiveEvent event) { | ||
| if (event.isCancelled()) return; | ||
|
|
||
| if ( | ||
| event.getPacketType() == PacketType.Play.Client.CHAT_MESSAGE | ||
| || event.getPacketType() == PacketType.Play.Client.CHAT_COMMAND | ||
| || event.getPacketType() == PacketType.Play.Client.CHAT_COMMAND_UNSIGNED | ||
| ) { | ||
| if (isStringTooBig(new PacketWrapper<>(event))) { | ||
| event.setCancelled(true); | ||
| onCancel(log, kick, event.getUser()); | ||
| } | ||
| } | ||
| } | ||
|
|
||
| private boolean isStringTooBig(PacketWrapper<?> packetWrapper) { | ||
| int strBufLen = packetWrapper.readVarInt(); | ||
|
|
||
| // Check if the received encoded string buffer length is zero or longer than maximum allowed | ||
| if (strBufLen < 0 || strBufLen > charLimit * 4) { | ||
| return true; | ||
| } | ||
|
|
||
| // The received string length is longer than maximum allowed | ||
| return ByteBufHelper.toString(packetWrapper.buffer, ByteBufHelper.readerIndex(packetWrapper.buffer), strBufLen, StandardCharsets.UTF_8) | ||
| .length() > charLimit; | ||
| } | ||
| } |
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