private void SendPacket(int packetID, IEnumerable <byte> packetData)
{
byte[] the_packet = concatBytes(getVarInt(packetID), packetData.ToArray());
if (compression_treshold > 0) //Compression enabled?
{
if (the_packet.Length >= compression_treshold) //Packet long enough for compressing?
{
byte[] compressed_packet = ZlibUtils.Compress(the_packet);
the_packet = concatBytes(getVarInt(the_packet.Length), compressed_packet);
}
else
{
byte[] uncompressed_length = getVarInt(0); //Not compressed (short packet)
the_packet = concatBytes(uncompressed_length, the_packet);
}
}
try
{
client.Client.Send(concatBytes(getVarInt(the_packet.Length), the_packet));
}
catch
{
handler.OnConnectionLost(0, "PacketSendError.");
}
}
private void readNextPacket(ref int packetID, List <byte> packetData)
{
packetData.Clear();
int size = readNextVarIntRAW(); //Packet size
packetData.AddRange(readDataRAW(size)); //Packet contents
//Handle packet decompression
if (protocolversion >= MC18Version && compression_treshold > 0)
{
int sizeUncompressed = readNextVarInt(packetData);
if (sizeUncompressed != 0) // != 0 means compressed, let's decompress
{
byte[] toDecompress = packetData.ToArray();
byte[] uncompressed = ZlibUtils.Decompress(toDecompress, sizeUncompressed);
packetData.Clear();
packetData.AddRange(uncompressed);
}
}
packetID = readNextVarInt(packetData); //Packet ID
}
private bool handlePacket(int packetID, List <byte> packetData)
{
if (login_phase)
{
switch (packetID) //Packet IDs are different while logging in
{
case 0x03:
if (protocolversion >= MC18Version)
{
compression_treshold = readNextVarInt(packetData);
}
break;
default:
return(false); //Ignored packet
}
}
switch (getPacketIncomingType(packetID))
{
case PacketIncomingType.KeepAlive:
SendPacket(PacketOutgoingType.KeepAlive, packetData);
break;
case PacketIncomingType.JoinGame:
handler.OnGameJoin();
readNextInt(packetData);
readNextByte(packetData);
if (protocolversion >= MC191Version)
{
this.currentDimension = readNextInt(packetData);
}
else
{
this.currentDimension = (sbyte)readNextByte(packetData);
}
readNextByte(packetData);
readNextByte(packetData);
readNextString(packetData);
if (protocolversion >= MC18Version)
{
readNextBool(packetData); // Reduced debug info - 1.8 and above
}
break;
case PacketIncomingType.ChatMessage:
string message = readNextString(packetData);
handler.OnTextReceived(message);
break;
case PacketIncomingType.Respawn:
this.currentDimension = readNextInt(packetData);
readNextByte(packetData);
readNextByte(packetData);
readNextString(packetData);
break;
case PacketIncomingType.PlayerPositionAndLook:
if (protocolversion >= MC19Version)
{
int teleportID = readNextVarInt(packetData);
// Teleport confirm packet
SendPacket(PacketOutgoingType.TeleportConfirm, getVarInt(teleportID));
}
break;
case PacketIncomingType.PluginMessage:
String channel = readNextString(packetData);
if (protocolversion < MC18Version)
{
if (forgeInfo == null)
{
// 1.7 and lower prefix plugin channel packets with the length.
// We can skip it, though.
readNextShort(packetData);
}
else
{
// Forge does something even weirder with the length.
readNextVarShort(packetData);
}
}
// The remaining data in the array is the entire payload of the packet.
//handler.OnPluginChannelMessage(channel, packetData.ToArray());
#region Forge Login
if (forgeInfo != null && fmlHandshakeState != FMLHandshakeClientState.DONE)
{
if (channel == "FML|HS")
{
FMLHandshakeDiscriminator discriminator = (FMLHandshakeDiscriminator)readNextByte(packetData);
if (discriminator == FMLHandshakeDiscriminator.HandshakeReset)
{
fmlHandshakeState = FMLHandshakeClientState.START;
return(true);
}
switch (fmlHandshakeState)
{
case FMLHandshakeClientState.START:
if (discriminator != FMLHandshakeDiscriminator.ServerHello)
{
return(false);
}
// Send the plugin channel registration.
// REGISTER is somewhat special in that it doesn't actually include length information,
// and is also \0-separated.
// Also, yes, "FML" is there twice. Don't ask me why, but that's the way forge does it.
string[] channels = { "FML|HS", "FML", "FML|MP", "FML", "FORGE" };
SendPluginChannelPacket("REGISTER", Encoding.UTF8.GetBytes(string.Join("\0", channels)));
byte fmlProtocolVersion = readNextByte(packetData);
if (fmlProtocolVersion >= 1)
{
this.currentDimension = readNextInt(packetData);
}
// Tell the server we're running the same version.
SendForgeHandshakePacket(FMLHandshakeDiscriminator.ClientHello, new byte[] { fmlProtocolVersion });
// Then tell the server that we're running the same mods.
byte[][] mods = new byte[forgeInfo.Mods.Count][];
for (int i = 0; i < forgeInfo.Mods.Count; i++)
{
ForgeInfo.ForgeMod mod = forgeInfo.Mods[i];
mods[i] = concatBytes(getString(mod.ModID), getString(mod.Version));
}
SendForgeHandshakePacket(FMLHandshakeDiscriminator.ModList,
concatBytes(getVarInt(forgeInfo.Mods.Count), concatBytes(mods)));
fmlHandshakeState = FMLHandshakeClientState.WAITINGSERVERDATA;
return(true);
case FMLHandshakeClientState.WAITINGSERVERDATA:
if (discriminator != FMLHandshakeDiscriminator.ModList)
{
return(false);
}
Thread.Sleep(2000);
// Tell the server that yes, we are OK with the mods it has
// even though we don't actually care what mods it has.
SendForgeHandshakePacket(FMLHandshakeDiscriminator.HandshakeAck,
new byte[] { (byte)FMLHandshakeClientState.WAITINGSERVERDATA });
fmlHandshakeState = FMLHandshakeClientState.WAITINGSERVERCOMPLETE;
return(false);
case FMLHandshakeClientState.WAITINGSERVERCOMPLETE:
// The server now will tell us a bunch of registry information.
// We need to read it all, though, until it says that there is no more.
if (discriminator != FMLHandshakeDiscriminator.RegistryData)
{
return(false);
}
if (protocolversion < MC18Version)
{
// 1.7.10 and below have one registry
// with blocks and items.
int registrySize = readNextVarInt(packetData);
fmlHandshakeState = FMLHandshakeClientState.PENDINGCOMPLETE;
}
else
{
// 1.8+ has more than one registry.
bool hasNextRegistry = readNextBool(packetData);
string registryName = readNextString(packetData);
int registrySize = readNextVarInt(packetData);
if (!hasNextRegistry)
{
fmlHandshakeState = FMLHandshakeClientState.PENDINGCOMPLETE;
}
}
return(false);
case FMLHandshakeClientState.PENDINGCOMPLETE:
// The server will ask us to accept the registries.
// Just say yes.
if (discriminator != FMLHandshakeDiscriminator.HandshakeAck)
{
return(false);
}
SendForgeHandshakePacket(FMLHandshakeDiscriminator.HandshakeAck,
new byte[] { (byte)FMLHandshakeClientState.PENDINGCOMPLETE });
fmlHandshakeState = FMLHandshakeClientState.COMPLETE;
return(true);
case FMLHandshakeClientState.COMPLETE:
// One final "OK". On the actual forge source, a packet is sent from
// the client to the client saying that the connection was complete, but
// we don't need to do that.
SendForgeHandshakePacket(FMLHandshakeDiscriminator.HandshakeAck,
new byte[] { (byte)FMLHandshakeClientState.COMPLETE });
fmlHandshakeState = FMLHandshakeClientState.DONE;
return(true);
}
}
}
#endregion
#region AntiCheat
if (channel == "AntiCheat3.4.3")
{
Console.WriteLine("检测到AntiCheat.");
string code = ZlibUtils.GZIPdecompress(packetData.ToArray());
}
#endregion
return(false);
case PacketIncomingType.KickPacket:
handler.OnConnectionLost(2, readNextString(packetData));
return(false);
case PacketIncomingType.NetworkCompressionTreshold:
if (protocolversion >= MC18Version && protocolversion < MC19Version)
{
compression_treshold = readNextVarInt(packetData);
}
break;
case PacketIncomingType.ResourcePackSend:
string url = readNextString(packetData);
string hash = readNextString(packetData);
//Send back "accepted" and "successfully loaded" responses for plugins making use of resource pack mandatory
byte[] responseHeader = new byte[0];
if (protocolversion < MC110Version) //MC 1.10 does not include resource pack hash in responses
{
responseHeader = concatBytes(getVarInt(hash.Length), Encoding.UTF8.GetBytes(hash));
}
SendPacket(PacketOutgoingType.ResourcePackStatus, concatBytes(responseHeader, getVarInt(3))); //Accepted pack
SendPacket(PacketOutgoingType.ResourcePackStatus, concatBytes(responseHeader, getVarInt(0))); //Successfully loaded
break;
default:
return(false); //Ignored packet
}
return(true); //Packet processed
}