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Correctly resolve protocol version of player (#1473)

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Pasqual Koschmieder 2022-01-02 19:32:46 +01:00 committed by GitHub
parent e77f8ced4c
commit 74833f8680
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1 changed files with 11 additions and 2 deletions
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13
src/main/java/com/comphenix/protocol/injector/netty/ChannelInjector.java
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@ -30,6 +30,7 @@ import com.comphenix.protocol.reflect.FuzzyReflection;
import com.comphenix.protocol.reflect.VolatileField;
import com.comphenix.protocol.reflect.accessors.Accessors;
import com.comphenix.protocol.reflect.accessors.FieldAccessor;
import com.comphenix.protocol.reflect.fuzzy.FuzzyFieldContract;
import com.comphenix.protocol.utility.ByteBuddyFactory;
import com.comphenix.protocol.utility.ByteBuddyGenerated;
import com.comphenix.protocol.utility.MinecraftFields;
@ -56,6 +57,7 @@ import org.bukkit.entity.Player;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.net.Socket;
import java.net.SocketAddress;
import java.util.*;
@ -84,6 +86,7 @@ public class ChannelInjector extends ByteToMessageDecoder implements Injector {
// Versioning
private static Class<?> PACKET_SET_PROTOCOL = null;
private static FieldAccessor PROTOCOL_VERSION_ACCESSOR = null;
private static AtomicInteger keyId = new AtomicInteger();
private static AttributeKey<Integer> PROTOCOL_KEY;
@ -662,15 +665,21 @@ public class ChannelInjector extends ByteToMessageDecoder implements Injector {
if (PACKET_SET_PROTOCOL == null) {
try {
PACKET_SET_PROTOCOL = PacketType.Handshake.Client.SET_PROTOCOL.getPacketClass();
// resolve the protocol version field here - if we're unable to find it we don't need to worry about it
Field protocolVersionField = FuzzyReflection.fromClass(PACKET_SET_PROTOCOL, true).getField(FuzzyFieldContract.newBuilder()
.banModifier(Modifier.STATIC)
.typeExact(int.class)
.build());
PROTOCOL_VERSION_ACCESSOR = Accessors.getFieldAccessor(protocolVersionField);
} catch (Throwable ex) {
PACKET_SET_PROTOCOL = getClass(); // If we can't find it don't worry about it
}
}
if (PACKET_SET_PROTOCOL.equals(packetClass)) {
FuzzyReflection fuzzy = FuzzyReflection.fromObject(packet);
try {
int protocol = (int) fuzzy.invokeMethod(packet, "getProtocol", int.class);
int protocol = (int) PROTOCOL_VERSION_ACCESSOR.get(packet);
originalChannel.attr(PROTOCOL_KEY).set(protocol);
} catch (Throwable ex) {
// Oh well