Add very basic Java MC server impl
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/*
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* MIT License
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*
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* Copyright (c) 2024 Braydon (Rainnny).
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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package cc.fascinated.common.packet;
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import lombok.NonNull;
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import java.io.DataInputStream;
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import java.io.DataOutputStream;
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import java.io.IOException;
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/**
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* Represents a packet in the
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* Minecraft Java protocol.
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*
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* @author Braydon
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* @see <a href="https://wiki.vg/Protocol">Protocol Docs</a>
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*/
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public abstract class MinecraftJavaPacket {
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/**
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* Process this packet.
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*
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* @param inputStream the input stream to read from
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* @param outputStream the output stream to write to
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* @throws IOException if an I/O error occurs
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*/
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public abstract void process(@NonNull DataInputStream inputStream, @NonNull DataOutputStream outputStream) throws IOException;
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/**
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* Write a variable integer to the output stream.
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*
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* @param outputStream the output stream to write to
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* @param paramInt the integer to write
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* @throws IOException if an I/O error occurs
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*/
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protected final void writeVarInt(DataOutputStream outputStream, int paramInt) throws IOException {
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while (true) {
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if ((paramInt & 0xFFFFFF80) == 0) {
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outputStream.writeByte(paramInt);
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return;
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}
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outputStream.writeByte(paramInt & 0x7F | 0x80);
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paramInt >>>= 7;
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}
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}
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/**
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* Read a variable integer from the input stream.
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*
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* @param inputStream the input stream to read from
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* @return the integer that was read
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* @throws IOException if an I/O error occurs
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*/
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protected final int readVarInt(@NonNull DataInputStream inputStream) throws IOException {
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int i = 0;
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int j = 0;
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while (true) {
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int k = inputStream.readByte();
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i |= (k & 0x7F) << j++ * 7;
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if (j > 5) {
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throw new RuntimeException("VarInt too big");
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}
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if ((k & 0x80) != 128) {
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break;
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}
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}
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return i;
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}
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}
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package cc.fascinated.common.packet.impl.java;
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import cc.fascinated.common.packet.MinecraftJavaPacket;
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import lombok.AllArgsConstructor;
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import lombok.NonNull;
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import lombok.ToString;
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import java.io.ByteArrayOutputStream;
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import java.io.DataInputStream;
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import java.io.DataOutputStream;
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import java.io.IOException;
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/**
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* This packet is sent by the client to the server to set
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* the hostname, port, and protocol version of the client.
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*
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* @author Braydon
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* @see <a href="https://wiki.vg/Protocol#Handshake">Protocol Docs</a>
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*/
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@AllArgsConstructor @ToString
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public final class JavaPacketHandshakingInSetProtocol extends MinecraftJavaPacket {
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private static final byte ID = 0x00; // The ID of the packet
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private static final int STATUS_HANDSHAKE = 1; // The status handshake ID
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/**
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* The hostname of the server.
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*/
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@NonNull private final String hostname;
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/**
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* The port of the server.
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*/
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private final int port;
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/**
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* The protocol version of the server.
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*/
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private final int protocolVersion;
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/**
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* Process this packet.
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*
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* @param inputStream the input stream to read from
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* @param outputStream the output stream to write to
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* @throws IOException if an I/O error occurs
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*/
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@Override
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public void process(@NonNull DataInputStream inputStream, @NonNull DataOutputStream outputStream) throws IOException {
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try (ByteArrayOutputStream handshakeBytes = new ByteArrayOutputStream();
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DataOutputStream handshake = new DataOutputStream(handshakeBytes)
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) {
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handshake.writeByte(ID); // Write the ID of the packet
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writeVarInt(handshake, protocolVersion); // Write the protocol version
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writeVarInt(handshake, hostname.length()); // Write the length of the hostname
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handshake.writeBytes(hostname); // Write the hostname
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handshake.writeShort(port); // Write the port
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writeVarInt(handshake, STATUS_HANDSHAKE); // Write the status handshake ID
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// Write the handshake bytes to the output stream
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writeVarInt(outputStream, handshakeBytes.size());
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outputStream.write(handshakeBytes.toByteArray());
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}
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}
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}
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@ -0,0 +1,62 @@
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package cc.fascinated.common.packet.impl.java;
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import cc.fascinated.common.packet.MinecraftJavaPacket;
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import lombok.Getter;
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import lombok.NonNull;
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import java.io.DataInputStream;
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import java.io.DataOutputStream;
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import java.io.IOException;
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/**
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* This packet is sent by the client to the server to request the
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* status of the server. The server will respond with a json object
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* containing the server's status.
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*
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* @author Braydon
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* @see <a href="https://wiki.vg/Protocol#Status_Request">Protocol Docs</a>
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*/
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@Getter
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public final class JavaPacketStatusInStart extends MinecraftJavaPacket {
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private static final byte ID = 0x00; // The ID of the packet
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/**
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* The response json from the server, null if none.
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*/
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private String response;
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/**
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* Process this packet.
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*
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* @param inputStream the input stream to read from
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* @param outputStream the output stream to write to
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* @throws IOException if an I/O error occurs
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*/
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@Override
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public void process(@NonNull DataInputStream inputStream, @NonNull DataOutputStream outputStream) throws IOException {
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// Send the status request
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outputStream.writeByte(0x01); // Size of packet
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outputStream.writeByte(ID);
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// Read the status response
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readVarInt(inputStream); // Size of the response
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int id = readVarInt(inputStream);
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if (id == -1) { // The stream was prematurely ended
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throw new IOException("Server prematurely ended stream.");
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} else if (id != ID) { // Invalid packet ID
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throw new IOException("Server returned invalid packet ID.");
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}
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int length = readVarInt(inputStream); // Length of the response
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if (length == -1) { // The stream was prematurely ended
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throw new IOException("Server prematurely ended stream.");
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} else if (length == 0) {
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throw new IOException("Server returned unexpected value.");
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}
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// Get the json response
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byte[] data = new byte[length];
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inputStream.readFully(data);
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response = new String(data);
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}
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}
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