void AddMessageLength(OutputMessage message)
{
int pos = message.Tell();
message.Seek(0);
message.AddU16((ushort)message.GetBufferLength());
message.IncreaseHeaderLength(sizeof(ushort));
message.Seek(pos + sizeof(ushort));
}
void AddSequenceNumber(OutputMessage message)
{
int pos = message.Tell();
message.Seek(0);
message.AddU32(m_SequenceNumber++);
message.IncreaseHeaderLength(sizeof(uint));
message.Seek(pos + sizeof(uint));
}
void AddChecksum(OutputMessage message)
{
if (ChecksumEnabled)
{
uint checksum = Adler32(message.GetBuffer().ToArray(), (uint)message.GetBufferLength());
int pos = message.Tell();
message.Seek(0);
message.AddU32(checksum);
message.IncreaseHeaderLength(sizeof(uint));
message.Seek(pos + sizeof(uint));
}
}
protected void SendLogin()
{
OutputMessage message = new OutputMessage();
message.AddU8(ClientLoginOpCodes.EnterAccount);
message.AddU16(Utility.OperatingSystem.GetCurrentOs());
var gameManager = OpenTibiaUnity.GameManager;
message.AddU16((ushort)gameManager.ProtocolVersion);
if (gameManager.GetFeature(GameFeatures.GameClientVersion))
{
message.AddU32((uint)gameManager.ClientVersion);
}
if (gameManager.GetFeature(GameFeatures.GameContentRevision))
{
message.AddU16(Constants.ContentRevision);
message.AddU16(0);
}
else
{
message.AddU32(Constants.DatSignature);
}
message.AddU32(Constants.SprSignature);
message.AddU32(Constants.PicSignature);
if (gameManager.GetFeature(GameFeatures.GamePreviewState))
{
message.AddU8(0x00);
}
int offset = message.Tell();
var random = new System.Random();
if (gameManager.GetFeature(GameFeatures.GameLoginPacketEncryption))
{
message.AddU8(0); // first byte must be zero
GenerateXteaKey(random);
AddXteaKey(message);
}
if (gameManager.GetFeature(GameFeatures.GameAccountNames))
{
message.AddString(AccountName);
}
else
{
message.AddU32(uint.Parse(AccountName));
}
message.AddString(Password);
int paddingBytes = Crypto.RSA.GetRsaSize() - (message.Tell() - offset);
for (int i = 0; i < paddingBytes; i++)
{
message.AddU8((byte)random.Next(0xFF));
}
if (gameManager.GetFeature(GameFeatures.GameLoginPacketEncryption))
{
Crypto.RSA.EncryptMessage(message);
}
if (gameManager.GetFeature(GameFeatures.GameOGLInformation))
{
message.AddU8(1);
message.AddU8(1);
if (gameManager.ClientVersion >= 1072)
{
message.AddString(string.Format("{0} {1}", OpenTibiaUnity.GraphicsVendor, OpenTibiaUnity.GraphicsDevice));
}
else
{
message.AddString(OpenTibiaUnity.GraphicsDevice);
}
message.AddString(OpenTibiaUnity.GraphicsVersion);
}
if (gameManager.GetFeature(GameFeatures.GameAuthenticator))
{
offset = message.Tell();
message.AddU8(0);
message.AddString(string.Empty); // no auth-token
message.AddU8(0); // stay logged-in for a while
paddingBytes = Crypto.RSA.GetRsaSize() - (message.Tell() - offset);
for (int i = 0; i < paddingBytes; i++)
{
message.AddU8((byte)random.Next(0xFF));
}
Crypto.RSA.EncryptMessage(message);
}
if (gameManager.GetFeature(GameFeatures.GameProtocolChecksum))
{
ChecksumEnabled = true;
}
WriteToOutput(message);
if (gameManager.GetFeature(GameFeatures.GameLoginPacketEncryption))
{
XteaEnabled = true;
}
}
// TODO: use a pool instead
// and confirm the encryption of the packet ONLY on a successful sent
// This is working, but using a pool is more of a robust
public void SendLoginPacket(uint challengeTimestamp, byte challengeRandom)
{
OutputMessage message = new OutputMessage();
message.AddU8(ClientServerOpCodes.PendingGame);
message.AddU16(Utility.OperatingSystem.GetCurrentOs());
var gameManager = OpenTibiaUnity.GameManager;
message.AddU16((ushort)gameManager.ProtocolVersion);
if (gameManager.GetFeature(GameFeatures.GameClientVersion))
{
message.AddU32((uint)gameManager.ClientVersion);
}
if (gameManager.GetFeature(GameFeatures.GameContentRevision))
{
message.AddU16(Constants.ContentRevision);
}
if (gameManager.GetFeature(GameFeatures.GamePreviewState))
{
message.AddU8(0);
}
int offset = message.Tell();
message.AddU8(0); // first byte must be zero;
var random = new System.Random();
if (gameManager.GetFeature(GameFeatures.GameLoginPacketEncryption))
{
GenerateXteaKey(random);
AddXteaKey(message);
message.AddU8(0x00); // gm
}
if (gameManager.GetFeature(GameFeatures.GameSessionKey))
{
message.AddString(SessionKey);
message.AddString(CharacterName);
}
else
{
if (gameManager.GetFeature(GameFeatures.GameAccountNames))
{
message.AddString(AccountName);
}
else
{
message.AddU32(uint.Parse(AccountName));
}
message.AddString(CharacterName);
message.AddString(Password);
if (gameManager.GetFeature(GameFeatures.GameAuthenticator))
{
message.AddString(AuthenticatorToken);
}
}
if (gameManager.GetFeature(GameFeatures.GameChallengeOnLogin))
{
message.AddU32(challengeTimestamp);
message.AddU8(challengeRandom);
}
int paddingBytes = Crypto.RSA.GetRsaSize() - (message.Tell() - offset);
for (int i = 0; i < paddingBytes; i++)
{
message.AddU8((byte)random.Next(0xFF));
}
if (gameManager.GetFeature(GameFeatures.GameLoginPacketEncryption))
{
Crypto.RSA.EncryptMessage(message);
}
if (gameManager.GetFeature(GameFeatures.GameProtocolChecksum))
{
ChecksumEnabled = true;
}
WriteToOutput(message);
if (gameManager.GetFeature(GameFeatures.GameLoginPacketEncryption))
{
XteaEnabled = true;
}
}
