internal PacketEncoder(ISAACCipher cipher)
{
_cipher = cipher;
}
private async Task DecodeLogin(IChannelHandlerContext context, IByteBuffer input, List <object> output)
{
if (input.ReadableBytes < 2)
{
return; //Invalid.
}
int loginType = input.ReadByte(); //16 = connecting, 18 = reconnecting.
if (loginType != 16 && loginType != 18)
{
Console.WriteLine($"Invalid login type: {loginType}");
await context.CloseAsync();
return;
}
int blockLength = input.ReadByte() - 40; //40 is the extra offset.
if (blockLength <= 0)
{
await CloseChannel(context, $"Encrypted packet size zero or negative: {blockLength}");
return;
}
byte magicNumber = input.ReadByte();
short clientVersion = input.ReadShort();
byte highOrLowMemory = input.ReadByte();
// Skip the CRC keys.
for (int i = 0; i < 9; i++)
{
input.ReadInt();
}
input.ReadByte(); //RSA is disabled, skip the block length.
int rsaOpCode = input.ReadByte();
if (rsaOpCode != 10)
{
await CloseChannel(context, "Unable to decode RSA block properly!");
return;
}
long clientHalf = input.ReadLong();
long serverHalf = input.ReadLong();
int[] isaacSeed = { (int)(clientHalf >> 32), (int)clientHalf, (int)(serverHalf >> 32), (int)serverHalf };
ISAACCipher inCipher = new ISAACCipher(isaacSeed);
for (int i = 0; i < isaacSeed.Length; i++)
{
isaacSeed[i] += 50;
}
ISAACCipher outCipher = new ISAACCipher(isaacSeed);
int uid = input.ReadInt();
string username = input.GetString();
string password = input.GetString();
bool userExists = await _playerController.UserExists(username);
if (userExists)
{
if (!await _playerController.TryLogin(username, password)) //Invalid credentials.
{
await context.WriteAndFlushAsync(new LoginErrorComposer(LoginMessage.INVALID_CREDS).Buffer).ContinueWith(async(task, channel) =>
{
await((IChannelHandlerContext)channel).CloseAsync();
}, context);
return;
}
}
else
{
await _playerController.TryRegister(username, password);
}
if (_sessionController.TryGetSession(context.Channel.Id, out ISession session))
{
await context.WriteAndFlushAsync(new LoginSuccessComposer().Buffer);
context.Channel.Pipeline
.AddBefore("decoder", "packetEncoder", new PacketEncoder(outCipher))
.AddAfter("packetEncoder", "packetDecoder", new PacketDecoder(inCipher))
.Remove(this);
IPlayer player = await _playerController.GetPlayer(username, password);
session.Player = player;
await session.PostLogin();
}
}