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Added status protocol support for Eaglercraft

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This commit is contained in:
RaphiMC 2023-04-08 02:41:29 +02:00
parent c0e04ee5f6
commit 5ff22c7aab
1 changed files with 99 additions and 17 deletions
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116
src/main/java/net/raphimc/viaproxy/proxy/client2proxy/eaglercraft/EaglercraftHandler.java
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@ -18,6 +18,13 @@
package net.raphimc.viaproxy.proxy.client2proxy.eaglercraft;
import com.google.common.net.HostAndPort;
import com.viaversion.viaversion.libs.gson.JsonArray;
import com.viaversion.viaversion.libs.gson.JsonObject;
import com.viaversion.viaversion.libs.gson.JsonParser;
import com.viaversion.viaversion.protocols.base.ClientboundStatusPackets;
import com.viaversion.viaversion.protocols.base.ServerboundHandshakePackets;
import com.viaversion.viaversion.protocols.base.ServerboundLoginPackets;
import com.viaversion.viaversion.protocols.base.ServerboundStatusPackets;
import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.MessageToMessageCodec;
@ -25,6 +32,7 @@ import io.netty.handler.codec.http.websocketx.BinaryWebSocketFrame;
import io.netty.handler.codec.http.websocketx.TextWebSocketFrame;
import io.netty.handler.codec.http.websocketx.WebSocketFrame;
import io.netty.handler.codec.http.websocketx.WebSocketServerProtocolHandler;
import net.lenni0451.mcstructs.text.serializer.TextComponentSerializer;
import net.raphimc.netminecraft.constants.ConnectionState;
import net.raphimc.netminecraft.constants.MCPackets;
import net.raphimc.netminecraft.constants.MCPipeline;
@ -36,8 +44,13 @@ import net.raphimc.viaproxy.ViaProxy;
import net.raphimc.viaproxy.proxy.client2proxy.Client2ProxyChannelInitializer;
import net.raphimc.viaproxy.util.logging.Logger;
import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.util.ArrayList;
import java.util.Base64;
import java.util.List;
import java.util.UUID;
@ -69,12 +82,69 @@ public class EaglercraftHandler extends MessageToMessageCodec<WebSocketFrame, By
}
@Override
protected void encode(ChannelHandlerContext ctx, ByteBuf in, List<Object> out) {
if (this.state != State.LOGIN_COMPLETE) {
protected void encode(ChannelHandlerContext ctx, ByteBuf in, List<Object> out) throws IOException {
if (this.state == State.STATUS) {
final int packetId = PacketTypes.readVarInt(in);
if (packetId != ClientboundStatusPackets.STATUS_RESPONSE.getId()) {
throw new IllegalStateException("Unexpected packet id " + packetId);
}
final JsonObject root = JsonParser.parseString(PacketTypes.readString(in, Short.MAX_VALUE)).getAsJsonObject();
final JsonObject response = new JsonObject();
response.addProperty("name", "ViaProxy");
response.addProperty("brand", "ViaProxy");
if (root.has("version")) {
response.add("vers", root.getAsJsonObject("version").get("name"));
} else {
response.addProperty("vers", "Unknown");
}
response.addProperty("cracked", true);
response.addProperty("secure", false);
response.addProperty("time", System.currentTimeMillis());
response.addProperty("uuid", UUID.randomUUID().toString());
response.addProperty("type", "motd");
final JsonObject data = new JsonObject();
data.addProperty("cache", false);
final JsonArray motd = new JsonArray();
if (root.has("description")) {
final String[] motdLines = TextComponentSerializer.V1_8.deserialize(root.get("description").toString()).asLegacyFormatString().split("\n");
for (String motdLine : motdLines) {
motd.add(motdLine);
}
}
data.add("motd", motd);
data.addProperty("icon", root.has("favicon"));
if (root.has("players")) {
final JsonObject javaPlayers = root.getAsJsonObject("players");
data.add("online", javaPlayers.get("online"));
data.add("max", javaPlayers.get("max"));
final JsonArray players = new JsonArray();
if (javaPlayers.has("sample")) {
javaPlayers.getAsJsonArray("sample").forEach(player -> players.add(TextComponentSerializer.V1_8.deserialize(player.getAsJsonObject().get("name").getAsString()).asLegacyFormatString()));
}
data.add("players", players);
}
response.add("data", data);
out.add(new TextWebSocketFrame(response.toString()));
if (root.has("favicon")) {
final BufferedImage icon = ImageIO.read(new ByteArrayInputStream(Base64.getDecoder().decode(root.get("favicon").getAsString().substring(22).replace("\n", "").getBytes(StandardCharsets.UTF_8))));
final int[] pixels = icon.getRGB(0, 0, 64, 64, null, 0, 64);
final byte[] iconPixels = new byte[64 * 64 * 4];
for (int i = 0; i < 64 * 64; ++i) {
iconPixels[i * 4] = (byte) ((pixels[i] >> 16) & 0xFF);
iconPixels[i * 4 + 1] = (byte) ((pixels[i] >> 8) & 0xFF);
iconPixels[i * 4 + 2] = (byte) (pixels[i] & 0xFF);
iconPixels[i * 4 + 3] = (byte) ((pixels[i] >> 24) & 0xFF);
}
out.add(new BinaryWebSocketFrame(ctx.alloc().buffer().writeBytes(iconPixels)));
}
} else if (this.state == State.LOGIN_COMPLETE) {
out.add(new BinaryWebSocketFrame(in.retain()));
} else {
throw new IllegalStateException("Cannot send packets before login is completed");
}
out.add(new BinaryWebSocketFrame(in.retain()));
}
@Override
@ -207,11 +277,9 @@ public class EaglercraftHandler extends MessageToMessageCodec<WebSocketFrame, By
}
this.state = State.LOGIN_COMPLETE;
final int handshakeId = MCPackets.C2S_HANDSHAKE.getId(this.version.getVersion());
final int loginHelloId = MCPackets.C2S_LOGIN_HELLO.getId(this.version.getVersion());
this.pluginMessageId = MCPackets.C2S_PLUGIN_MESSAGE.getId(this.version.getVersion());
if (handshakeId == -1 || loginHelloId == -1 || this.pluginMessageId == -1) {
if (this.pluginMessageId == -1) {
Logger.LOGGER.error("Unsupported protocol version: " + this.version.getVersion());
ctx.close();
return;
@ -221,16 +289,10 @@ public class EaglercraftHandler extends MessageToMessageCodec<WebSocketFrame, By
ctx.pipeline().remove(Client2ProxyChannelInitializer.LEGACY_PASSTHROUGH_HANDLER_NAME);
}
final ByteBuf handshake = ctx.alloc().buffer();
PacketTypes.writeVarInt(handshake, handshakeId); // packet id
PacketTypes.writeVarInt(handshake, this.version.getVersion()); // protocol version
PacketTypes.writeString(handshake, this.host.getHost()); // address
handshake.writeShort(this.host.getPort()); // port
PacketTypes.writeVarInt(handshake, ConnectionState.LOGIN.getId()); // next state
out.add(handshake);
out.add(this.writeHandshake(ctx.alloc().buffer(), ConnectionState.LOGIN));
final ByteBuf loginHello = ctx.alloc().buffer();
PacketTypes.writeVarInt(loginHello, loginHelloId); // packet id
PacketTypes.writeVarInt(loginHello, ServerboundLoginPackets.HELLO.getId()); // packet id
PacketTypes.writeString(loginHello, this.username); // username
out.add(loginHello);
@ -267,11 +329,21 @@ public class EaglercraftHandler extends MessageToMessageCodec<WebSocketFrame, By
}
} else if (in instanceof TextWebSocketFrame) {
final String text = ((TextWebSocketFrame) in).text();
ctx.close();
if (this.state != State.PRE_HANDSHAKE) {
throw new IllegalStateException("Unexpected text frame in state " + this.state);
}
if (!text.equalsIgnoreCase("accept: motd")) {
ctx.close();
return;
}
this.state = State.STATUS;
this.version = VersionEnum.r1_8;
out.add(this.writeHandshake(ctx.alloc().buffer(), ConnectionState.STATUS));
final ByteBuf statusRequest = ctx.alloc().buffer();
PacketTypes.writeVarInt(statusRequest, ServerboundStatusPackets.STATUS_REQUEST.getId()); // packet id
out.add(statusRequest);
} else {
throw new UnsupportedOperationException("Unsupported frame type: " + in.getClass().getName());
}
@ -292,7 +364,17 @@ public class EaglercraftHandler extends MessageToMessageCodec<WebSocketFrame, By
super.userEventTriggered(ctx, evt);
}
private ByteBuf writeHandshake(final ByteBuf byteBuf, final ConnectionState state) {
PacketTypes.writeVarInt(byteBuf, ServerboundHandshakePackets.CLIENT_INTENTION.getId()); // packet id
PacketTypes.writeVarInt(byteBuf, this.version.getVersion()); // protocol version
PacketTypes.writeString(byteBuf, this.host.getHost()); // address
byteBuf.writeShort(this.host.getPort()); // port
PacketTypes.writeVarInt(byteBuf, state.getId()); // next state
return byteBuf;
}
public enum State {
STATUS,
PRE_HANDSHAKE,
HANDSHAKE,
HANDSHAKE_COMPLETE,