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ProxyInboundHandler.java
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ProxyInboundHandler.java
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package lilypad.server.proxy.net;
import java.io.IOException;
import java.net.InetSocketAddress;
import java.util.Arrays;
import java.util.HashMap;
import java.util.Map;
import javax.crypto.Cipher;
import lilypad.server.common.IPlayerCallback;
import lilypad.server.common.util.GsonUtils;
import lilypad.server.proxy.ProxyConfig;
import lilypad.packet.common.Packet;
import lilypad.server.proxy.packet.MinecraftPacketConstants;
import lilypad.server.proxy.packet.StatefulPacketCodecProviderPair;
import lilypad.server.proxy.packet.impl.HandshakePacket;
import lilypad.server.proxy.packet.impl.LoginEncryptRequestPacket;
import lilypad.server.proxy.packet.impl.LoginEncryptResponsePacket;
import lilypad.server.proxy.packet.impl.LoginStartPacket;
import lilypad.server.proxy.packet.impl.StatusPingPacket;
import lilypad.server.proxy.packet.impl.StatusRequestPacket;
import lilypad.server.proxy.packet.impl.StatusResponsePacket;
import lilypad.server.proxy.packet.state.LoginStateCodecProvider;
import lilypad.server.proxy.packet.state.StatusStateCodecProvider;
import io.netty.channel.ChannelHandler.Sharable;
import io.netty.channel.Channel;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;
import io.netty.handler.codec.DecoderException;
import io.netty.handler.timeout.ReadTimeoutException;
import io.netty.util.AttributeKey;
@Sharable
public class ProxyInboundHandler extends SimpleChannelInboundHandler<Packet> {
private static final AttributeKey<ProxySession> proxySessionKey = new AttributeKey<ProxySession>("proxySession");
private ProxyConfig config;
private ProxySessionMapper sessionMapper;
public ProxyInboundHandler(ProxyConfig config, ProxySessionMapper sessionMapper) {
this.config = config;
this.sessionMapper = sessionMapper;
}
@Override
public void channelActive(ChannelHandlerContext context) throws Exception {
context.attr(proxySessionKey).set(new ProxySession(this.config, this.sessionMapper, context.channel()));
}
@Override
public void channelInactive(ChannelHandlerContext context) throws Exception {
ProxySession proxySession = context.attr(proxySessionKey).get();
if(proxySession == null) {
return;
}
context.attr(proxySessionKey).set(null);
proxySession.inboundDisconnected();
}
@Override
protected void channelRead0(ChannelHandlerContext context, Packet packet) throws Exception {
final ProxySession proxySession = context.attr(proxySessionKey).get();
if(proxySession == null) {
context.close();
return;
}
switch(proxySession.getState()) {
case DISCONNECTED:
if(packet.getOpcode() == HandshakePacket.opcode) {
HandshakePacket handshakePacket = (HandshakePacket) packet;
if(handshakePacket.getProtocolVersion() != MinecraftPacketConstants.protocolVersion) {
context.close();
return;
}
proxySession.setServerAddress(handshakePacket.getServerAddress());
switch(handshakePacket.getRequestedState()) {
case 1:
proxySession.setState(ProxyState.STATUS);
context.channel().attr(StatefulPacketCodecProviderPair.attributeKey).get().setState(StatusStateCodecProvider.instance);
break;
case 2:
proxySession.setState(ProxyState.LOGIN);
context.channel().attr(StatefulPacketCodecProviderPair.attributeKey).get().setState(LoginStateCodecProvider.instance);
break;
default:
context.close();
return;
}
} else {
context.close();
}
break;
case LOGIN:
if(packet.getOpcode() == LoginStartPacket.opcode) {
LoginStartPacket loginStartPacket = (LoginStartPacket) packet;
proxySession.setUsername(loginStartPacket.getName());
if(this.config.proxy_isPlayerAuthenticate()) {
proxySession.getInboundChannel().writeAndFlush(new LoginEncryptRequestPacket(proxySession.genServerKey(), this.config.proxy_getKeyPair().getPublic(), proxySession.genVerifyToken()));
proxySession.setState(ProxyState.LOGIN_ENCRYPT);
} else {
proxySession.inboundAuthenticate(true);
}
} else {
context.close();
}
break;
case LOGIN_ENCRYPT:
if(packet.getOpcode() == LoginEncryptResponsePacket.opcode) {
LoginEncryptResponsePacket loginEncryptResponsePacket = (LoginEncryptResponsePacket) packet;
Cipher cipher = Cipher.getInstance("RSA");
cipher.init(Cipher.DECRYPT_MODE, this.config.proxy_getKeyPair().getPrivate());
byte[] verifyToken = cipher.doFinal(loginEncryptResponsePacket.getVerifyToken());
if(!Arrays.equals(verifyToken, proxySession.getVerifyToken())) {
context.close();
return;
}
proxySession.setSharedSecret(cipher.doFinal(loginEncryptResponsePacket.getSharedSecret()));
proxySession.setState(ProxyState.VERIFY);
proxySession.getInboundChannel().pipeline().addFirst(new AesCodec(proxySession.getSharedSecret()));
proxySession.inboundAuthenticate();
} else {
context.close();
}
break;
case STATUS:
if(packet.getOpcode() == StatusRequestPacket.opcode) {
IPlayerCallback playerCallback = this.config.proxy_getPlayerCallback();
int playerCount;
int playerMaximum;
if(playerCallback != null) {
playerCount = playerCallback.getPlayerCount();
playerMaximum = playerCallback.getPlayerMaximum();
} else {
playerCount = this.sessionMapper.getAuthenticatedSize();
playerMaximum = this.config.proxy_getPlayerMaximum();
}
Map<String, Object> version = new HashMap<String, Object>();
version.put("name", MinecraftPacketConstants.minecraftVersion);
version.put("protocol", MinecraftPacketConstants.protocolVersion);
Map<String, Object> players = new HashMap<String, Object>();
players.put("max", playerMaximum);
players.put("online", playerCount);
Map<String, Object> description = new HashMap<String, Object>();
description.put("text", MinecraftPacketConstants.colorize(this.config.proxy_getPlayerMotd()));
Map<String, Object> response = new HashMap<String, Object>();
response.put("version", version);
response.put("players", players);
response.put("description", description);
String favicon = this.config.proxy_getPlayerFavicon();
if(favicon != null && favicon.length() != 0) {
response.put("favicon", favicon);
}
proxySession.getInboundChannel().writeAndFlush(new StatusResponsePacket(GsonUtils.gson().toJson(response)));
proxySession.setState(ProxyState.STATUS_PING);
} else {
context.close();
}
break;
case STATUS_PING:
if(packet.getOpcode() == StatusPingPacket.opcode) {
proxySession.getInboundChannel().writeAndFlush(packet);
context.close();
} else {
context.close();
}
break;
case CONNECTED:
proxySession.inboundReceived(packet);;
break;
default:
break;
}
}
@Override
public void exceptionCaught(ChannelHandlerContext context, Throwable cause) throws Exception {
Channel channel = context.channel();
if(cause instanceof IOException && cause.getMessage().equals("Connection reset by peer")) {
// ignore
} else if(cause instanceof ReadTimeoutException) {
// ignore
} else if(cause instanceof DecoderException) {
// ignore
} else {
cause.printStackTrace();
}
if(channel.isOpen()) {
channel.close();
}
}
public String getAddress(Channel channel) {
return ((InetSocketAddress) channel.remoteAddress()).getAddress().getHostAddress();
}
}