├── .gitignore ├── LICENSE ├── README.md ├── build.gradle ├── gradle └── wrapper │ ├── gradle-wrapper.jar │ └── gradle-wrapper.properties ├── gradlew ├── gradlew.bat ├── scripts └── demo.js ├── settings.gradle └── src └── main └── java └── fr └── themode └── proxy ├── Main.java ├── MinecraftBuffer.java ├── PacketBound.java ├── Server.java ├── State.java ├── connection ├── ConnectionContext.java ├── ProtocolFormat.java └── ProtocolHandler.java ├── packet ├── Packet.java ├── PacketRegistry.java ├── PacketTransformer.java └── play │ └── OutChatMessagePacket.java ├── script ├── Script.java ├── ScriptExecutor.java └── ScriptLocal.java ├── utils ├── CompressionUtils.java ├── FileUtils.java └── ProtocolUtils.java └── worker ├── Worker.java ├── WorkerContext.java └── WorkerThread.java /.gitignore: -------------------------------------------------------------------------------- 1 | # Project exclude paths 2 | /.gradle/ 3 | /build/ 4 | /build/classes/java/main/ -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | Apache License 2 | Version 2.0, January 2004 3 | http://www.apache.org/licenses/ 4 | 5 | TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 6 | 7 | 1. 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We also recommend that a 185 | file or class name and description of purpose be included on the 186 | same "printed page" as the copyright notice for easier 187 | identification within third-party archives. 188 | 189 | Copyright [yyyy] [name of copyright owner] 190 | 191 | Licensed under the Apache License, Version 2.0 (the "License"); 192 | you may not use this file except in compliance with the License. 193 | You may obtain a copy of the License at 194 | 195 | http://www.apache.org/licenses/LICENSE-2.0 196 | 197 | Unless required by applicable law or agreed to in writing, software 198 | distributed under the License is distributed on an "AS IS" BASIS, 199 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 200 | See the License for the specific language governing permissions and 201 | limitations under the License. 202 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # Overview 2 | The goal of this project is to offer an efficient way to transform every in/outgoing packets without butchering the game server performance. 3 | 4 | The project is far from done, and nothing say that it will ever be. It can however be used to force current proxy developers to care a bit more 5 | about pipeline control & buffer allocation/pooling :) 6 | 7 | # Performance 8 | The proxy is able to run with 30MB of heap and around 6MB of direct memory per network thread, other than that the code is almost free of any allocation. 9 | Early tests show x2-8 cpu reduction compared to the current top of the line, to be taken with a grain of salt considering the lack of parity 10 | (no multi-server support & no encryption) 11 | 12 | # Packet transformation 13 | Scripts are done in JS thanks to [GraalJS](https://github.com/oracle/graaljs), example are present [here](https://github.com/TheMode/Proxy/tree/master/scripts). 14 | -------------------------------------------------------------------------------- /build.gradle: -------------------------------------------------------------------------------- 1 | plugins { 2 | id 'java' 3 | id "com.github.johnrengelman.shadow" version "7.0.0" 4 | } 5 | 6 | group 'org.example' 7 | version '1.0-SNAPSHOT' 8 | 9 | repositories { 10 | mavenCentral() 11 | } 12 | 13 | dependencies { 14 | testImplementation 'org.junit.jupiter:junit-jupiter-api:5.7.0' 15 | testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine:5.7.0' 16 | 17 | // Primitive maps 18 | implementation 'org.eclipse.collections:eclipse-collections-api:10.4.0' 19 | implementation 'org.eclipse.collections:eclipse-collections:10.4.0' 20 | 21 | // https://mvnrepository.com/artifact/org.graalvm.js/js 22 | implementation group: 'org.graalvm.js', name: 'js', version: '21.1.0' 23 | } 24 | 25 | test { 26 | useJUnitPlatform() 27 | } -------------------------------------------------------------------------------- /gradle/wrapper/gradle-wrapper.jar: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/TheMode/Paxy/59d9ab27a33fdbb6854ca87f8afa6f5f60d3b0dd/gradle/wrapper/gradle-wrapper.jar -------------------------------------------------------------------------------- /gradle/wrapper/gradle-wrapper.properties: -------------------------------------------------------------------------------- 1 | distributionBase=GRADLE_USER_HOME 2 | distributionPath=wrapper/dists 3 | distributionUrl=https\://services.gradle.org/distributions/gradle-7.0.2-bin.zip 4 | zipStoreBase=GRADLE_USER_HOME 5 | zipStorePath=wrapper/dists 6 | -------------------------------------------------------------------------------- /gradlew: -------------------------------------------------------------------------------- 1 | #!/usr/bin/env sh 2 | 3 | # 4 | # Copyright 2015 the original author or authors. 5 | # 6 | # Licensed under the Apache License, Version 2.0 (the "License"); 7 | # you may not use this file except in compliance with the License. 8 | # You may obtain a copy of the License at 9 | # 10 | # https://www.apache.org/licenses/LICENSE-2.0 11 | # 12 | # Unless required by applicable law or agreed to in writing, software 13 | # distributed under the License is distributed on an "AS IS" BASIS, 14 | # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 15 | # See the License for the specific language governing permissions and 16 | # limitations under the License. 17 | # 18 | 19 | ############################################################################## 20 | ## 21 | ## Gradle start up script for UN*X 22 | ## 23 | ############################################################################## 24 | 25 | # Attempt to set APP_HOME 26 | # Resolve links: $0 may be a link 27 | PRG="$0" 28 | # Need this for relative symlinks. 29 | while [ -h "$PRG" ] ; do 30 | ls=`ls -ld "$PRG"` 31 | link=`expr "$ls" : '.*-> \(.*\)$'` 32 | if expr "$link" : '/.*' > /dev/null; then 33 | PRG="$link" 34 | else 35 | PRG=`dirname "$PRG"`"/$link" 36 | fi 37 | done 38 | SAVED="`pwd`" 39 | cd "`dirname \"$PRG\"`/" >/dev/null 40 | APP_HOME="`pwd -P`" 41 | cd "$SAVED" >/dev/null 42 | 43 | APP_NAME="Gradle" 44 | APP_BASE_NAME=`basename "$0"` 45 | 46 | # Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script. 47 | DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"' 48 | 49 | # Use the maximum available, or set MAX_FD != -1 to use that value. 50 | MAX_FD="maximum" 51 | 52 | warn () { 53 | echo "$*" 54 | } 55 | 56 | die () { 57 | echo 58 | echo "$*" 59 | echo 60 | exit 1 61 | } 62 | 63 | # OS specific support (must be 'true' or 'false'). 64 | cygwin=false 65 | msys=false 66 | darwin=false 67 | nonstop=false 68 | case "`uname`" in 69 | CYGWIN* ) 70 | cygwin=true 71 | ;; 72 | Darwin* ) 73 | darwin=true 74 | ;; 75 | MINGW* ) 76 | msys=true 77 | ;; 78 | NONSTOP* ) 79 | nonstop=true 80 | ;; 81 | esac 82 | 83 | CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar 84 | 85 | 86 | # Determine the Java command to use to start the JVM. 87 | if [ -n "$JAVA_HOME" ] ; then 88 | if [ -x "$JAVA_HOME/jre/sh/java" ] ; then 89 | # IBM's JDK on AIX uses strange locations for the executables 90 | JAVACMD="$JAVA_HOME/jre/sh/java" 91 | else 92 | JAVACMD="$JAVA_HOME/bin/java" 93 | fi 94 | if [ ! -x "$JAVACMD" ] ; then 95 | die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME 96 | 97 | Please set the JAVA_HOME variable in your environment to match the 98 | location of your Java installation." 99 | fi 100 | else 101 | JAVACMD="java" 102 | which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 103 | 104 | Please set the JAVA_HOME variable in your environment to match the 105 | location of your Java installation." 106 | fi 107 | 108 | # Increase the maximum file descriptors if we can. 109 | if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then 110 | MAX_FD_LIMIT=`ulimit -H -n` 111 | if [ $? -eq 0 ] ; then 112 | if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then 113 | MAX_FD="$MAX_FD_LIMIT" 114 | fi 115 | ulimit -n $MAX_FD 116 | if [ $? -ne 0 ] ; then 117 | warn "Could not set maximum file descriptor limit: $MAX_FD" 118 | fi 119 | else 120 | warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT" 121 | fi 122 | fi 123 | 124 | # For Darwin, add options to specify how the application appears in the dock 125 | if $darwin; then 126 | GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\"" 127 | fi 128 | 129 | # For Cygwin or MSYS, switch paths to Windows format before running java 130 | if [ "$cygwin" = "true" -o "$msys" = "true" ] ; then 131 | APP_HOME=`cygpath --path --mixed "$APP_HOME"` 132 | CLASSPATH=`cygpath --path --mixed "$CLASSPATH"` 133 | 134 | JAVACMD=`cygpath --unix "$JAVACMD"` 135 | 136 | # We build the pattern for arguments to be converted via cygpath 137 | ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null` 138 | SEP="" 139 | for dir in $ROOTDIRSRAW ; do 140 | ROOTDIRS="$ROOTDIRS$SEP$dir" 141 | SEP="|" 142 | done 143 | OURCYGPATTERN="(^($ROOTDIRS))" 144 | # Add a user-defined pattern to the cygpath arguments 145 | if [ "$GRADLE_CYGPATTERN" != "" ] ; then 146 | OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)" 147 | fi 148 | # Now convert the arguments - kludge to limit ourselves to /bin/sh 149 | i=0 150 | for arg in "$@" ; do 151 | CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -` 152 | CHECK2=`echo "$arg"|egrep -c "^-"` ### Determine if an option 153 | 154 | if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then ### Added a condition 155 | eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"` 156 | else 157 | eval `echo args$i`="\"$arg\"" 158 | fi 159 | i=`expr $i + 1` 160 | done 161 | case $i in 162 | 0) set -- ;; 163 | 1) set -- "$args0" ;; 164 | 2) set -- "$args0" "$args1" ;; 165 | 3) set -- "$args0" "$args1" "$args2" ;; 166 | 4) set -- "$args0" "$args1" "$args2" "$args3" ;; 167 | 5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;; 168 | 6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;; 169 | 7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;; 170 | 8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;; 171 | 9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;; 172 | esac 173 | fi 174 | 175 | # Escape application args 176 | save () { 177 | for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done 178 | echo " " 179 | } 180 | APP_ARGS=`save "$@"` 181 | 182 | # Collect all arguments for the java command, following the shell quoting and substitution rules 183 | eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS" 184 | 185 | exec "$JAVACMD" "$@" 186 | -------------------------------------------------------------------------------- /gradlew.bat: -------------------------------------------------------------------------------- 1 | @rem 2 | @rem Copyright 2015 the original author or authors. 3 | @rem 4 | @rem Licensed under the Apache License, Version 2.0 (the "License"); 5 | @rem you may not use this file except in compliance with the License. 6 | @rem You may obtain a copy of the License at 7 | @rem 8 | @rem https://www.apache.org/licenses/LICENSE-2.0 9 | @rem 10 | @rem Unless required by applicable law or agreed to in writing, software 11 | @rem distributed under the License is distributed on an "AS IS" BASIS, 12 | @rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 | @rem See the License for the specific language governing permissions and 14 | @rem limitations under the License. 15 | @rem 16 | 17 | @if "%DEBUG%" == "" @echo off 18 | @rem ########################################################################## 19 | @rem 20 | @rem Gradle startup script for Windows 21 | @rem 22 | @rem ########################################################################## 23 | 24 | @rem Set local scope for the variables with windows NT shell 25 | if "%OS%"=="Windows_NT" setlocal 26 | 27 | set DIRNAME=%~dp0 28 | if "%DIRNAME%" == "" set DIRNAME=. 29 | set APP_BASE_NAME=%~n0 30 | set APP_HOME=%DIRNAME% 31 | 32 | @rem Resolve any "." and ".." in APP_HOME to make it shorter. 33 | for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi 34 | 35 | @rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script. 36 | set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m" 37 | 38 | @rem Find java.exe 39 | if defined JAVA_HOME goto findJavaFromJavaHome 40 | 41 | set JAVA_EXE=java.exe 42 | %JAVA_EXE% -version >NUL 2>&1 43 | if "%ERRORLEVEL%" == "0" goto execute 44 | 45 | echo. 46 | echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 47 | echo. 48 | echo Please set the JAVA_HOME variable in your environment to match the 49 | echo location of your Java installation. 50 | 51 | goto fail 52 | 53 | :findJavaFromJavaHome 54 | set JAVA_HOME=%JAVA_HOME:"=% 55 | set JAVA_EXE=%JAVA_HOME%/bin/java.exe 56 | 57 | if exist "%JAVA_EXE%" goto execute 58 | 59 | echo. 60 | echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME% 61 | echo. 62 | echo Please set the JAVA_HOME variable in your environment to match the 63 | echo location of your Java installation. 64 | 65 | goto fail 66 | 67 | :execute 68 | @rem Setup the command line 69 | 70 | set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar 71 | 72 | 73 | @rem Execute Gradle 74 | "%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %* 75 | 76 | :end 77 | @rem End local scope for the variables with windows NT shell 78 | if "%ERRORLEVEL%"=="0" goto mainEnd 79 | 80 | :fail 81 | rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of 82 | rem the _cmd.exe /c_ return code! 83 | if not "" == "%GRADLE_EXIT_CONSOLE%" exit 1 84 | exit /b 1 85 | 86 | :mainEnd 87 | if "%OS%"=="Windows_NT" endlocal 88 | 89 | :omega 90 | -------------------------------------------------------------------------------- /scripts/demo.js: -------------------------------------------------------------------------------- 1 | registerOutgoing("play", "chat-message", (context, packet) => { 2 | context.count = (context.count ?? 0) + 1 3 | console.log("test " + context.count) 4 | packet.message = `{"text":"No message for you."}` 5 | }) -------------------------------------------------------------------------------- /settings.gradle: -------------------------------------------------------------------------------- 1 | rootProject.name = 'Proxy' 2 | 3 | -------------------------------------------------------------------------------- /src/main/java/fr/themode/proxy/Main.java: -------------------------------------------------------------------------------- 1 | package fr.themode.proxy; 2 | 3 | import java.io.IOException; 4 | 5 | public class Main { 6 | public static void main(String[] args) throws IOException { 7 | new Server(); 8 | } 9 | } 10 | -------------------------------------------------------------------------------- /src/main/java/fr/themode/proxy/MinecraftBuffer.java: -------------------------------------------------------------------------------- 1 | package fr.themode.proxy; 2 | 3 | import fr.themode.proxy.utils.ProtocolUtils; 4 | 5 | import java.nio.ByteBuffer; 6 | import java.util.UUID; 7 | 8 | public class MinecraftBuffer { 9 | 10 | private final ByteBuffer buffer; 11 | 12 | private MinecraftBuffer(ByteBuffer buffer) { 13 | this.buffer = buffer; 14 | } 15 | 16 | public static MinecraftBuffer wrap(ByteBuffer buffer) { 17 | return new MinecraftBuffer(buffer); 18 | } 19 | 20 | public byte readByte() { 21 | return buffer.get(); 22 | } 23 | 24 | public void writeByte(byte value) { 25 | this.buffer.put(value); 26 | } 27 | 28 | public int readVarInt() { 29 | return ProtocolUtils.readVarInt(buffer); 30 | } 31 | 32 | public void writeVarInt(int value) { 33 | ProtocolUtils.writeVarInt(buffer, value); 34 | } 35 | 36 | public String readString(int length) { 37 | return ProtocolUtils.readString(buffer, length); 38 | } 39 | 40 | public void writeString(String string) { 41 | ProtocolUtils.writeString(buffer, string); 42 | } 43 | 44 | public UUID readUuid() { 45 | return new UUID(buffer.getLong(), buffer.getLong()); 46 | } 47 | 48 | public void writeUuid(UUID uuid) { 49 | buffer.putLong(uuid.getMostSignificantBits()); 50 | buffer.putLong(uuid.getLeastSignificantBits()); 51 | } 52 | } 53 | -------------------------------------------------------------------------------- /src/main/java/fr/themode/proxy/PacketBound.java: -------------------------------------------------------------------------------- 1 | package fr.themode.proxy; 2 | 3 | public enum PacketBound { 4 | IN, OUT 5 | } 6 | -------------------------------------------------------------------------------- /src/main/java/fr/themode/proxy/Server.java: -------------------------------------------------------------------------------- 1 | package fr.themode.proxy; 2 | 3 | import fr.themode.proxy.worker.Worker; 4 | 5 | import java.io.IOException; 6 | import java.net.InetSocketAddress; 7 | import java.net.SocketAddress; 8 | import java.net.UnixDomainSocketAddress; 9 | import java.nio.channels.SelectionKey; 10 | import java.nio.channels.Selector; 11 | import java.nio.channels.ServerSocketChannel; 12 | import java.nio.channels.SocketChannel; 13 | import java.util.ArrayList; 14 | import java.util.List; 15 | import java.util.Set; 16 | 17 | /** 18 | * Starts the proxy socket & workers. 19 | */ 20 | public final class Server { 21 | 22 | public static final int WORKER_COUNT = Integer.getInteger("proxy.workers", 23 | Runtime.getRuntime().availableProcessors() * 2); 24 | public static final int SOCKET_BUFFER_SIZE = Integer.getInteger("proxy.buffer-size", 262143); 25 | public static final int MAX_PACKET_SIZE = 2097151; // 3 bytes var-int 26 | public static final boolean NO_DELAY = true; 27 | 28 | private static final ProxyAddress PROXY_ADDRESS = ProxyAddress.inet("0.0.0.0", 25566); 29 | private static final ProxyAddress TARGET_ADDRESS = ProxyAddress.inet("0.0.0.0", 25565); 30 | 31 | private final List workers = new ArrayList<>(WORKER_COUNT); 32 | private int index; 33 | 34 | public Server() throws IOException { 35 | // Create all workers 36 | for (int i = 0; i < WORKER_COUNT; i++) { 37 | this.workers.add(new Worker()); 38 | } 39 | // Start server 40 | startEndPoint(); 41 | } 42 | 43 | private void startEndPoint() throws IOException { 44 | Selector selector = Selector.open(); 45 | ServerSocketChannel serverSocket = ServerSocketChannel.open(); 46 | serverSocket.bind(PROXY_ADDRESS.socketAddress()); 47 | serverSocket.configureBlocking(false); 48 | serverSocket.register(selector, SelectionKey.OP_ACCEPT); 49 | serverSocket.socket().setReceiveBufferSize(Server.SOCKET_BUFFER_SIZE); 50 | 51 | System.out.println("Server starting, wait for connections"); 52 | while (true) { 53 | // Busy wait for connections 54 | serverTick(selector, serverSocket); 55 | } 56 | } 57 | 58 | private void serverTick(Selector selector, ServerSocketChannel socketChannel) throws IOException { 59 | selector.select(); 60 | Set selectedKeys = selector.selectedKeys(); 61 | for (SelectionKey key : selectedKeys) { 62 | if (key.isAcceptable()) { 63 | // Register socket and forward to thread 64 | Worker thread = findWorker(); 65 | final SocketChannel client = socketChannel.accept(); 66 | final SocketChannel server; 67 | try { 68 | server = SocketChannel.open(TARGET_ADDRESS.socketAddress()); 69 | } catch (Exception e) { 70 | e.printStackTrace(); 71 | continue; 72 | } 73 | thread.receiveConnection(client, server); 74 | System.out.println("New connection"); 75 | } 76 | } 77 | selectedKeys.clear(); 78 | } 79 | 80 | private Worker findWorker() { 81 | this.index = ++index % WORKER_COUNT; 82 | return workers.get(index); 83 | } 84 | 85 | record ProxyAddress(SocketAddress socketAddress) { 86 | public static ProxyAddress inet(String host, int port) { 87 | return new ProxyAddress(new InetSocketAddress(host, port)); 88 | } 89 | 90 | public static ProxyAddress unix(String path) { 91 | return new ProxyAddress(UnixDomainSocketAddress.of(path)); 92 | } 93 | } 94 | } 95 | -------------------------------------------------------------------------------- /src/main/java/fr/themode/proxy/State.java: -------------------------------------------------------------------------------- 1 | package fr.themode.proxy; 2 | 3 | import fr.themode.proxy.packet.PacketRegistry; 4 | 5 | import java.util.Locale; 6 | 7 | /** 8 | * Represents a connection state. 9 | */ 10 | public enum State { 11 | HANDSHAKE(PacketRegistry.HANDSHAKE), 12 | STATUS(PacketRegistry.STATUS), 13 | LOGIN(PacketRegistry.LOGIN), 14 | PLAY(PacketRegistry.PLAY); 15 | 16 | private final PacketRegistry registry; 17 | 18 | State(PacketRegistry registry) { 19 | this.registry = registry; 20 | } 21 | 22 | public PacketRegistry registry() { 23 | return registry; 24 | } 25 | 26 | public static State from(String name) { 27 | return valueOf(name.toUpperCase(Locale.ROOT)); 28 | } 29 | } 30 | -------------------------------------------------------------------------------- /src/main/java/fr/themode/proxy/connection/ConnectionContext.java: -------------------------------------------------------------------------------- 1 | package fr.themode.proxy.connection; 2 | 3 | import fr.themode.proxy.PacketBound; 4 | import fr.themode.proxy.State; 5 | import fr.themode.proxy.packet.PacketTransformer; 6 | import fr.themode.proxy.utils.ProtocolUtils; 7 | import fr.themode.proxy.worker.WorkerContext; 8 | import org.graalvm.polyglot.proxy.ProxyObject; 9 | 10 | import java.io.IOException; 11 | import java.nio.BufferOverflowException; 12 | import java.nio.BufferUnderflowException; 13 | import java.nio.ByteBuffer; 14 | import java.nio.channels.SocketChannel; 15 | 16 | public class ConnectionContext { 17 | 18 | private final ProtocolFormat protocolFormat = ProtocolFormat.VANILLA; 19 | private final PacketTransformer transformer = PacketTransformer.VANILLA; 20 | 21 | private final SocketChannel target; 22 | private final ProtocolHandler handler; 23 | private final PacketBound packetBound; 24 | private final ProxyObject properties; 25 | 26 | private State state = State.HANDSHAKE; 27 | private boolean compression = false; 28 | private int compressionThreshold = 0; 29 | 30 | private ByteBuffer cacheBuffer; 31 | private ConnectionContext targetConnectionContext; 32 | 33 | public ConnectionContext(SocketChannel target, ProtocolHandler handler, PacketBound packetBound, 34 | ProxyObject properties) { 35 | this.target = target; 36 | this.handler = handler; 37 | this.packetBound = packetBound; 38 | this.properties = properties; 39 | } 40 | 41 | public void processPackets(WorkerContext workerContext) { 42 | ByteBuffer readBuffer = workerContext.readBuffer; 43 | final int limit = readBuffer.limit(); 44 | // Read all packets 45 | while (readBuffer.remaining() > 0) { 46 | readBuffer.mark(); // Mark the beginning of the packet 47 | try { 48 | // Read packet 49 | final int packetLength = ProtocolUtils.readVarInt(readBuffer); 50 | final int packetEnd = readBuffer.position() + packetLength; 51 | if (packetEnd > readBuffer.limit()) { 52 | // Integrity fail 53 | throw new BufferUnderflowException(); 54 | } 55 | 56 | readBuffer.limit(packetEnd); // Ensure that the reader doesn't exceed packet bound 57 | 58 | // Read protocol 59 | var content = workerContext.contentBuffer.clear(); 60 | if (protocolFormat.read(this, readBuffer, content, workerContext)) { 61 | // Payload is available in the read buffer without any copy/transformation 62 | content = readBuffer; 63 | } else { 64 | // Make the content buffer readable 65 | // Data has been copied over (probably involving decompression) 66 | content.flip(); 67 | } 68 | 69 | // TODO protocol conversion 70 | 71 | // Apply packet transformation 72 | final var transformBuffer = workerContext.transformPayload.clear(); 73 | boolean transformed = false; 74 | { 75 | final int transformCache = content.position(); 76 | try { 77 | transformed = transformer.transform(this, 78 | content, transformBuffer, 79 | workerContext.scriptLocal); 80 | } catch (Exception e) { 81 | e.printStackTrace(); 82 | } finally { 83 | content.position(transformCache); 84 | content = transformed ? transformBuffer.flip() : content; 85 | } 86 | } 87 | 88 | // Write to cache/socket 89 | if (!writeContent(readBuffer, content, transformed, workerContext)) { 90 | break; 91 | } 92 | 93 | // Process packet 94 | final int packetId = ProtocolUtils.readVarInt(content); 95 | try { 96 | this.handler.process(this, packetId, content); 97 | } catch (Exception e) { 98 | // Error while reading the packet 99 | e.printStackTrace(); 100 | break; 101 | } 102 | 103 | // Return to original state (before writing) 104 | readBuffer.limit(limit).position(packetEnd); 105 | } catch (BufferUnderflowException e) { 106 | readBuffer.reset(); 107 | this.cacheBuffer = ByteBuffer.allocateDirect(readBuffer.remaining()); 108 | this.cacheBuffer.put(readBuffer).flip(); 109 | break; 110 | } 111 | } 112 | 113 | // Write remaining 114 | try { 115 | write(workerContext.writeBuffer.flip()); 116 | } catch (IOException e) { 117 | // Client disconnected 118 | } 119 | } 120 | 121 | public SocketChannel getTarget() { 122 | return target; 123 | } 124 | 125 | public ConnectionContext getTargetContext() { 126 | return targetConnectionContext; 127 | } 128 | 129 | public PacketBound getPacketBound() { 130 | return packetBound; 131 | } 132 | 133 | public void consumeCache(ByteBuffer buffer) { 134 | if (cacheBuffer == null) { 135 | return; 136 | } 137 | buffer.put(cacheBuffer); 138 | this.cacheBuffer = null; 139 | } 140 | 141 | public ProxyObject getProperties() { 142 | return properties; 143 | } 144 | 145 | public State getState() { 146 | return state; 147 | } 148 | 149 | public void setState(State state) { 150 | this.state = state; 151 | } 152 | 153 | public boolean isCompression() { 154 | return compression; 155 | } 156 | 157 | public int getCompressionThreshold() { 158 | return compressionThreshold; 159 | } 160 | 161 | public void setCompression(int threshold) { 162 | this.compression = threshold > 0; 163 | this.compressionThreshold = threshold; 164 | } 165 | 166 | public void setTargetConnectionContext(ConnectionContext targetConnectionContext) { 167 | this.targetConnectionContext = targetConnectionContext; 168 | } 169 | 170 | private boolean writeContent(ByteBuffer readBuffer, ByteBuffer content, 171 | boolean transformed, WorkerContext workerContext) { 172 | final int contentPositionCache = content.position(); 173 | // Write to cache/socket 174 | ByteBuffer writeCache; 175 | if (transformed) { 176 | writeCache = workerContext.transform.clear(); 177 | this.protocolFormat.write(this, content, writeCache, workerContext); 178 | writeCache.flip(); 179 | } else { 180 | // Packet hasn't been modified, write slice 181 | writeCache = readBuffer.reset(); // to the beginning of the packet 182 | } 183 | final boolean result = incrementalWrite(writeCache, workerContext); 184 | content.position(contentPositionCache); 185 | return result; 186 | } 187 | 188 | private boolean incrementalWrite(ByteBuffer buffer, WorkerContext workerContext) { 189 | try { 190 | var writeBuffer = workerContext.writeBuffer; 191 | try { 192 | writeBuffer.put(buffer); 193 | } catch (BufferOverflowException e) { 194 | // Buffer is full, write in 2 steps 195 | write(writeBuffer.flip()); 196 | write(buffer); 197 | } 198 | return true; 199 | } catch (IOException e) { 200 | // Connection probably closed 201 | return false; 202 | } 203 | } 204 | 205 | private void write(ByteBuffer buffer) throws IOException { 206 | while (buffer.remaining() > 0) { 207 | target.write(buffer); 208 | } 209 | } 210 | } 211 | -------------------------------------------------------------------------------- /src/main/java/fr/themode/proxy/connection/ProtocolFormat.java: -------------------------------------------------------------------------------- 1 | package fr.themode.proxy.connection; 2 | 3 | import fr.themode.proxy.utils.CompressionUtils; 4 | import fr.themode.proxy.utils.ProtocolUtils; 5 | import fr.themode.proxy.worker.WorkerContext; 6 | 7 | import java.nio.ByteBuffer; 8 | import java.util.zip.DataFormatException; 9 | 10 | /** 11 | * Parses protocol data being forwarded to the transformer. 12 | */ 13 | public interface ProtocolFormat { 14 | 15 | /** 16 | * Packet format as described at https://wiki.vg/Protocol#Packet_format 17 | */ 18 | ProtocolFormat VANILLA = new ProtocolFormat() { 19 | @Override 20 | public boolean read(ConnectionContext context, ByteBuffer buffer, ByteBuffer payloadOut, WorkerContext workerContext) { 21 | if (!context.isCompression()) { 22 | // Compression disabled, payload is following 23 | return true; 24 | } 25 | final int dataLength = ProtocolUtils.readVarInt(buffer); 26 | if (dataLength == 0) { 27 | // Data is too small to be compressed, payload is following 28 | return true; 29 | } 30 | // Decompress to content buffer 31 | try { 32 | CompressionUtils.decompress(workerContext.inflater, buffer, payloadOut); 33 | } catch (DataFormatException e) { 34 | e.printStackTrace(); 35 | } 36 | return false; 37 | } 38 | 39 | @Override 40 | public void write(ConnectionContext context, ByteBuffer payload, ByteBuffer out, WorkerContext workerContext) { 41 | if (!context.isCompression()) { 42 | // Length + payload 43 | ProtocolUtils.writeVarInt(out, payload.remaining()); 44 | out.put(payload); 45 | return; 46 | } 47 | // Compressed format 48 | final int decompressedSize = payload.remaining(); 49 | final int lengthIndex = ProtocolUtils.writeEmptyVarIntHeader(out); 50 | final int contentStart = out.position(); 51 | if (decompressedSize >= context.getCompressionThreshold()) { 52 | ProtocolUtils.writeVarInt(out, decompressedSize); 53 | CompressionUtils.compress(workerContext.deflater, payload, out); 54 | } else { 55 | ProtocolUtils.writeVarInt(out, 0); 56 | out.put(payload); 57 | } 58 | final int finalSize = out.position() - contentStart; 59 | ProtocolUtils.writeVarIntHeader(out, lengthIndex, finalSize); 60 | } 61 | }; 62 | 63 | boolean read(ConnectionContext context, ByteBuffer buffer, ByteBuffer payloadOut, WorkerContext workerContext); 64 | 65 | void write(ConnectionContext context, ByteBuffer payload, ByteBuffer out, WorkerContext workerContext); 66 | } 67 | -------------------------------------------------------------------------------- /src/main/java/fr/themode/proxy/connection/ProtocolHandler.java: -------------------------------------------------------------------------------- 1 | package fr.themode.proxy.connection; 2 | 3 | import fr.themode.proxy.State; 4 | import fr.themode.proxy.utils.ProtocolUtils; 5 | 6 | import java.nio.ByteBuffer; 7 | 8 | /** 9 | * Handles basic packets (e.g. game state) to ensure proper parsing. 10 | */ 11 | public interface ProtocolHandler { 12 | ProtocolHandler CLIENT = (context, packetId, payload) -> { 13 | final var state = context.getState(); 14 | if (state == State.HANDSHAKE && packetId == 0) { 15 | // Change to Status/Login state 16 | final int protocol = ProtocolUtils.readVarInt(payload); 17 | final String address = ProtocolUtils.readString(payload, 255); 18 | final short port = payload.getShort(); 19 | final int stateId = ProtocolUtils.readVarInt(payload); 20 | final State nextState = switch (stateId) { 21 | case 1 -> State.STATUS; 22 | case 2 -> State.LOGIN; 23 | default -> throw new IllegalStateException("Unexpected value: " + stateId); 24 | }; 25 | context.setState(nextState); 26 | context.getTargetContext().setState(nextState); 27 | } else if (state == State.LOGIN && packetId == 0) { 28 | // Change to Play state 29 | context.setState(State.PLAY); 30 | } 31 | }; 32 | ProtocolHandler SERVER = (context, packetId, payload) -> { 33 | final var state = context.getState(); 34 | if (state == State.LOGIN) { 35 | // Change to Play State 36 | if (packetId == 2) { 37 | context.setState(State.PLAY); 38 | } else if (packetId == 3) { 39 | // Compression 40 | final int threshold = ProtocolUtils.readVarInt(payload); 41 | context.setCompression(threshold); 42 | context.getTargetContext().setCompression(threshold); 43 | } 44 | context.setState(State.PLAY); 45 | } 46 | }; 47 | 48 | void process(ConnectionContext context, int packetId, ByteBuffer payload); 49 | } 50 | -------------------------------------------------------------------------------- /src/main/java/fr/themode/proxy/packet/Packet.java: -------------------------------------------------------------------------------- 1 | package fr.themode.proxy.packet; 2 | 3 | import fr.themode.proxy.MinecraftBuffer; 4 | 5 | import java.util.HashMap; 6 | import java.util.Map; 7 | import java.util.function.BiConsumer; 8 | import java.util.function.Function; 9 | 10 | public abstract class Packet { 11 | 12 | protected boolean initialized, modified; 13 | 14 | public abstract void read(MinecraftBuffer in); 15 | 16 | public abstract void write(MinecraftBuffer out); 17 | 18 | public abstract Map getFields(); 19 | 20 | public void ensureInitialization(MinecraftBuffer in) { 21 | if (!initialized) { 22 | read(in); 23 | this.initialized = true; 24 | } 25 | } 26 | 27 | public boolean isModified() { 28 | return modified; 29 | } 30 | 31 | public static final class FieldMap

{ 32 | private final Map fields = new HashMap<>(); 33 | 34 | @SafeVarargs 35 | public FieldMap(Class

packetType, FieldEntry... entries) { 36 | for (var entry : entries) { 37 | this.fields.put(entry.name, entry.createField()); 38 | } 39 | } 40 | 41 | public Map getFields() { 42 | return fields; 43 | } 44 | } 45 | 46 | public static record FieldEntry

(String name, Class type, 47 | Function getter, BiConsumer setter) { 48 | public Field createField() { 49 | return new Field(name, (Class) type, 50 | o -> getter.apply((P) o), 51 | (packet, value) -> { 52 | ((P) packet).modified = true; 53 | setter.accept((P) packet, (T) value); 54 | }); 55 | } 56 | } 57 | 58 | public record Field(String name, Class type, 59 | Function getter, 60 | BiConsumer setter) { 61 | } 62 | } 63 | -------------------------------------------------------------------------------- /src/main/java/fr/themode/proxy/packet/PacketRegistry.java: -------------------------------------------------------------------------------- 1 | package fr.themode.proxy.packet; 2 | 3 | import fr.themode.proxy.PacketBound; 4 | import fr.themode.proxy.packet.play.OutChatMessagePacket; 5 | import org.eclipse.collections.impl.map.mutable.primitive.IntObjectHashMap; 6 | import org.eclipse.collections.impl.map.mutable.primitive.ObjectIntHashMap; 7 | 8 | import java.util.function.Supplier; 9 | 10 | public final class PacketRegistry { 11 | public static final PacketRegistry HANDSHAKE = handshake(); 12 | public static final PacketRegistry STATUS = status(); 13 | public static final PacketRegistry LOGIN = login(); 14 | public static final PacketRegistry PLAY = play(); 15 | 16 | private final ObjectIntHashMap incomingByName = new ObjectIntHashMap<>(); 17 | private final IntObjectHashMap incomingById = new IntObjectHashMap<>(); 18 | private final IntObjectHashMap> incomingSupplierMap = new IntObjectHashMap<>(); 19 | 20 | private final ObjectIntHashMap outgoingByName = new ObjectIntHashMap<>(); 21 | private final IntObjectHashMap outgoingById = new IntObjectHashMap<>(); 22 | private final IntObjectHashMap> outgoingSupplierMap = new IntObjectHashMap<>(); 23 | 24 | public String getPacketName(PacketBound bound, int id) { 25 | return switch (bound) { 26 | case IN -> incomingById.get(id); 27 | case OUT -> outgoingById.get(id); 28 | }; 29 | } 30 | 31 | public int getPacketId(PacketBound bound, String name) { 32 | return switch (bound) { 33 | case IN -> incomingByName.get(name); 34 | case OUT -> outgoingByName.get(name); 35 | }; 36 | } 37 | 38 | public Packet getPacket(PacketBound bound, int id) { 39 | Supplier supplier = switch (bound) { 40 | case IN -> incomingSupplierMap.get(id); 41 | case OUT -> outgoingSupplierMap.get(id); 42 | }; 43 | return supplier != null ? supplier.get() : null; 44 | } 45 | 46 | protected void registerIncoming(String name, int id, Supplier supplier) { 47 | this.incomingByName.put(name, id); 48 | this.incomingById.put(id, name); 49 | this.incomingSupplierMap.put(id, supplier); 50 | } 51 | 52 | protected void registerOutgoing(String name, int id, Supplier supplier) { 53 | this.outgoingByName.put(name, id); 54 | this.outgoingById.put(id, name); 55 | this.outgoingSupplierMap.put(id, supplier); 56 | } 57 | 58 | private static PacketRegistry handshake() { 59 | var registry = new PacketRegistry(); 60 | registry.registerIncoming("handshake", 0x00, null); 61 | return registry; 62 | } 63 | 64 | private static PacketRegistry status() { 65 | var registry = new PacketRegistry(); 66 | registry.registerIncoming("request", 0x00, null); 67 | registry.registerIncoming("ping", 0x01, null); 68 | 69 | registry.registerOutgoing("response", 0x00, null); 70 | registry.registerOutgoing("pong", 0x01, null); 71 | return registry; 72 | } 73 | 74 | private static PacketRegistry login() { 75 | var registry = new PacketRegistry(); 76 | 77 | registry.registerIncoming("login-start", 0x00, null); 78 | registry.registerIncoming("encryption-response", 0x01, null); 79 | registry.registerIncoming("login-plugin-response", 0x02, null); 80 | 81 | registry.registerOutgoing("disconnect", 0x00, null); 82 | registry.registerOutgoing("encryption-request", 0x01, null); 83 | registry.registerOutgoing("login-success", 0x02, null); 84 | return registry; 85 | } 86 | 87 | private static PacketRegistry play() { 88 | var registry = new PacketRegistry(); 89 | registry.registerOutgoing("chat-message", 0x0F, OutChatMessagePacket::new); 90 | return registry; 91 | } 92 | } 93 | -------------------------------------------------------------------------------- /src/main/java/fr/themode/proxy/packet/PacketTransformer.java: -------------------------------------------------------------------------------- 1 | package fr.themode.proxy.packet; 2 | 3 | import fr.themode.proxy.connection.ConnectionContext; 4 | import fr.themode.proxy.script.ScriptLocal; 5 | import fr.themode.proxy.utils.ProtocolUtils; 6 | 7 | import java.nio.ByteBuffer; 8 | 9 | public interface PacketTransformer { 10 | PacketTransformer VANILLA = (context, in, out, scriptLocal) -> { 11 | final int packetId = ProtocolUtils.readVarInt(in); 12 | return scriptLocal.run(context, packetId, in, out); 13 | }; 14 | 15 | boolean transform(ConnectionContext context, ByteBuffer in, ByteBuffer out, ScriptLocal scriptLocal); 16 | } 17 | -------------------------------------------------------------------------------- /src/main/java/fr/themode/proxy/packet/play/OutChatMessagePacket.java: -------------------------------------------------------------------------------- 1 | package fr.themode.proxy.packet.play; 2 | 3 | import fr.themode.proxy.MinecraftBuffer; 4 | import fr.themode.proxy.packet.Packet; 5 | 6 | import java.util.Map; 7 | import java.util.UUID; 8 | 9 | public class OutChatMessagePacket extends Packet { 10 | private static final FieldMap FIELD_MAP = new FieldMap<>(OutChatMessagePacket.class, 11 | new FieldEntry<>("message", String.class, (packet) -> packet.message, (packet, value) -> packet.message = value), 12 | new FieldEntry<>("position", byte.class, (packet) -> packet.position, (packet, value) -> packet.position = value), 13 | new FieldEntry<>("sender", UUID.class, (packet) -> packet.sender, (packet, value) -> packet.sender = value)); 14 | 15 | private String message; 16 | private byte position; 17 | private UUID sender; 18 | 19 | @Override 20 | public void read(MinecraftBuffer in) { 21 | this.message = in.readString(262144); 22 | this.position = in.readByte(); 23 | this.sender = in.readUuid(); 24 | } 25 | 26 | @Override 27 | public void write(MinecraftBuffer out) { 28 | out.writeString(message); 29 | out.writeByte(position); 30 | out.writeUuid(sender); 31 | } 32 | 33 | @Override 34 | public Map getFields() { 35 | return FIELD_MAP.getFields(); 36 | } 37 | } 38 | -------------------------------------------------------------------------------- /src/main/java/fr/themode/proxy/script/Script.java: -------------------------------------------------------------------------------- 1 | package fr.themode.proxy.script; 2 | 3 | import org.graalvm.polyglot.Context; 4 | import org.graalvm.polyglot.HostAccess; 5 | import org.graalvm.polyglot.Source; 6 | import org.graalvm.polyglot.Value; 7 | import org.graalvm.polyglot.proxy.ProxyExecutable; 8 | 9 | public class Script { 10 | 11 | private final ScriptExecutor executor = new ScriptExecutor(); 12 | private final String fileString; 13 | 14 | private boolean loaded; 15 | private volatile Context context; 16 | 17 | public Script(String fileString) { 18 | this.fileString = fileString; 19 | } 20 | 21 | public void load() { 22 | if (loaded) 23 | return; 24 | this.loaded = true; 25 | 26 | final Source source = Source.create("js", fileString); 27 | assert source != null; 28 | this.context = createContext(executor); 29 | this.context.eval(source); 30 | } 31 | 32 | public void unload() { 33 | if (!loaded) 34 | return; 35 | this.loaded = false; 36 | this.context.close(); 37 | } 38 | 39 | public ScriptExecutor getExecutor() { 40 | return executor; 41 | } 42 | 43 | private static Context createContext(ScriptExecutor executor) { 44 | Context context = Context.newBuilder("js") 45 | .allowHostAccess(HostAccess.ALL) 46 | .build(); 47 | Value bindings = context.getBindings("js"); 48 | bindings.putMember("registerOutgoing", (ProxyExecutable) arguments -> { 49 | executor.registerOutgoing(arguments[0].asString(), arguments[1].asString(), 50 | (connectionContext, polyglotPacket) -> arguments[2].execute(connectionContext, polyglotPacket)); 51 | return null; 52 | }); 53 | bindings.putMember("registerIncoming", (ProxyExecutable) arguments -> { 54 | executor.registerIncoming(arguments[0].asString(), arguments[1].asString(), 55 | (connectionContext, polyglotPacket) -> arguments[2].execute(connectionContext, polyglotPacket)); 56 | return null; 57 | }); 58 | return context; 59 | } 60 | } 61 | 62 | -------------------------------------------------------------------------------- /src/main/java/fr/themode/proxy/script/ScriptExecutor.java: -------------------------------------------------------------------------------- 1 | package fr.themode.proxy.script; 2 | 3 | import fr.themode.proxy.MinecraftBuffer; 4 | import fr.themode.proxy.PacketBound; 5 | import fr.themode.proxy.State; 6 | import fr.themode.proxy.connection.ConnectionContext; 7 | import fr.themode.proxy.packet.Packet; 8 | import org.eclipse.collections.impl.map.mutable.primitive.IntObjectHashMap; 9 | import org.graalvm.polyglot.Value; 10 | import org.graalvm.polyglot.proxy.ProxyObject; 11 | 12 | import java.util.ArrayList; 13 | import java.util.List; 14 | import java.util.Map; 15 | import java.util.function.BiConsumer; 16 | 17 | public class ScriptExecutor { 18 | private final IntObjectHashMap> outgoingListeners = new IntObjectHashMap<>(); 19 | private final IntObjectHashMap> incomingListeners = new IntObjectHashMap<>(); 20 | 21 | public void registerOutgoing(String stateString, String packetName, PacketListener listener) { 22 | final State state = State.from(stateString); 23 | final int id = state.registry().getPacketId(PacketBound.OUT, packetName); 24 | this.outgoingListeners.getIfAbsentPut(id, ArrayList::new) 25 | .add(listener); 26 | } 27 | 28 | public void registerIncoming(String stateString, String packetName, PacketListener listener) { 29 | final State state = State.from(stateString); 30 | final int id = state.registry().getPacketId(PacketBound.IN, packetName); 31 | this.incomingListeners.getIfAbsentPut(id, ArrayList::new) 32 | .add(listener); 33 | } 34 | 35 | protected void run(ConnectionContext context, PacketBound bound, int id, Packet packet, MinecraftBuffer in) { 36 | final var listeners = switch (bound) { 37 | case IN -> incomingListeners.get(id); 38 | case OUT -> outgoingListeners.get(id); 39 | }; 40 | if (listeners == null || listeners.isEmpty()) { 41 | // Nothing to run 42 | return; 43 | } 44 | packet.ensureInitialization(in); 45 | final var properties = context.getProperties(); 46 | final var polyglotPacket = new PolyglotPacket(packet); 47 | listeners.forEach(listener -> listener.accept(properties, polyglotPacket)); 48 | } 49 | 50 | public interface PacketListener extends BiConsumer { 51 | } 52 | 53 | static class PolyglotPacket implements ProxyObject { 54 | private final Packet packet; 55 | private final Map fields; 56 | 57 | PolyglotPacket(Packet packet) { 58 | this.packet = packet; 59 | this.fields = packet.getFields(); 60 | } 61 | 62 | @Override 63 | public Object getMember(String key) { 64 | return fields.get(key).getter().apply(packet); 65 | } 66 | 67 | @Override 68 | public Object getMemberKeys() { 69 | return fields.keySet().toArray(String[]::new); 70 | } 71 | 72 | @Override 73 | public boolean hasMember(String key) { 74 | return fields.containsKey(key); 75 | } 76 | 77 | @Override 78 | public void putMember(String key, Value value) { 79 | final var field = fields.get(key); 80 | final var casted = value.as(field.type()); 81 | field.setter().accept(packet, casted); 82 | } 83 | } 84 | } 85 | -------------------------------------------------------------------------------- /src/main/java/fr/themode/proxy/script/ScriptLocal.java: -------------------------------------------------------------------------------- 1 | package fr.themode.proxy.script; 2 | 3 | import fr.themode.proxy.MinecraftBuffer; 4 | import fr.themode.proxy.connection.ConnectionContext; 5 | import fr.themode.proxy.packet.Packet; 6 | import fr.themode.proxy.utils.FileUtils; 7 | import fr.themode.proxy.utils.ProtocolUtils; 8 | 9 | import java.io.File; 10 | import java.nio.ByteBuffer; 11 | import java.util.ArrayList; 12 | import java.util.List; 13 | 14 | public class ScriptLocal { 15 | 16 | private final List