@Override
public void channelRead(final ChannelHandlerContext ctx, final Object inputObj) throws Exception {
try {
final ByteBuf input = (ByteBuf) inputObj;
if (!input.isReadable()) {
return;
}
final Channel channel = ctx.channel();
receivedData.writeBytes(input);
ProtocolVersion handshakeversion = ProtocolVersion.NOT_SET;
receivedData.readerIndex(0);
int firstbyte = receivedData.readUnsignedByte();
switch (firstbyte) {
case 0xFE:
{ // old ping
try {
if (receivedData.readableBytes() == 0) { // really old protocol probably
scheduleTask(ctx, new Ping11ResponseTask(channel), 1000, TimeUnit.MILLISECONDS);
} else if (receivedData.readUnsignedByte() == 1) {
if (receivedData.readableBytes() == 0) {
// 1.5.2 probably
scheduleTask(
ctx, new Ping152ResponseTask(this, channel), 500, TimeUnit.MILLISECONDS);
} else if ((receivedData.readUnsignedByte() == 0xFA)
&& "MC|PingHost"
.equals(
new String(
Utils.toArray(
receivedData.readBytes(receivedData.readUnsignedShort() * 2)),
StandardCharsets.UTF_16BE))) { // 1.6.*
receivedData.readUnsignedShort();
handshakeversion = ProtocolVersion.fromId(receivedData.readUnsignedByte());
}
}
} catch (IndexOutOfBoundsException ex) {
}
break;
}
case 0x02:
{ // 1.6 or 1.5.2 handshake
try {
handshakeversion = ProtocolVersion.fromId(receivedData.readUnsignedByte());
} catch (IndexOutOfBoundsException ex) {
}
break;
}
default:
{ // 1.7 or 1.8 handshake
receivedData.readerIndex(0);
ByteBuf data = getVarIntPrefixedData(receivedData);
if (data != null) {
handshakeversion = readNPHandshake(data);
}
break;
}
}
// if we detected the protocol than we save it and process data
if (handshakeversion != ProtocolVersion.NOT_SET) {
setProtocol(channel, receivedData, handshakeversion);
}
} catch (Throwable t) {
ctx.channel().close();
} finally {
ReferenceCountUtil.release(inputObj);
}
}
private ProtocolVersion readNPHandshake(ByteBuf data) {
if (readVarInt(data) == 0x00) {
return ProtocolVersion.fromId(readVarInt(data));
}
return ProtocolVersion.UNKNOWN;
}