private void AynsReceive(IAsyncResult result)
{
int BytesTransferred = -1;
try
{
BytesTransferred = Handle.EndReceive(result);
SysLogger.Log("Received " + BytesTransferred, SysLogType.Network);
if (BytesTransferred <= 0)
{
Disconnect();
return;
}
}
catch(Exception ex)
{
SysLogger.Log(ex.Message, SysLogType.Error);
Disconnect();
return;
}
try
{
//let's check the certificate
if (Client.Server != null && Client.Server.serverProperties != null)
{
if (Client.ConnectionTime > Client.Server.serverProperties.ClientTimeConnected)
{
//we need to wait till the time is right
Disconnect();
return;
}
}
this.LastPacketRecvSW = Stopwatch.StartNew();
ReadableDataLen += BytesTransferred;
DataIn += (ulong)BytesTransferred;
bool Process = true;
while (Process)
{
if (ReceiveState == ReceiveType.Header)
{
Process = ReadableDataLen >= HEADER_SIZE;
if (ReadableDataLen >= HEADER_SIZE)
{
lock (HeaderEncryption)
{
headerConfuser.Deobfuscate(ref Buffer, ReadOffset);
HeaderEncryption.Decrypt(Buffer, ReadOffset, HEADER_SIZE);
}
using(PayloadReader pr = new PayloadReader(Buffer))
{
pr.Position = ReadOffset;
PayloadLen = pr.ReadThreeByteInteger();
CurPacketId = pr.ReadByte();
ConnectionId = pr.ReadUShort();
HeaderId = pr.ReadUShort();
HeaderChecksum = pr.ReadByte();
FeatureId = pr.ReadInteger();
}
byte ReChecksum = 0; //re-calculate the checksum
ReChecksum += (byte)PayloadLen;
ReChecksum += CurPacketId;
ReChecksum += (byte)ConnectionId;
ReChecksum += (byte)HeaderId;
ReChecksum += (byte)FeatureId;
if (ReChecksum != HeaderChecksum ||
PayloadLen >= MAX_PACKET_SIZE ||
PayloadLen < 0)
{
Disconnect();
return;
}
if(PayloadLen > Buffer.Length)
{
ResizeBuffer(PayloadLen);
}
TotalReceived = HEADER_SIZE;
ReadableDataLen -= HEADER_SIZE;
ReadOffset += HEADER_SIZE;
ReceiveState = ReceiveType.Payload;
}
}
else if (ReceiveState == ReceiveType.Payload)
{
Process = ReadableDataLen >= PayloadLen;
if (ReadableDataLen >= PayloadLen)
{
byte[] DecryptedBuffer = null;
int DecryptedBuffLen = 0;
messageHandler.DecryptMessage(this, Buffer, ReadOffset, PayloadLen, ref DecryptedBuffer, ref DecryptedBuffLen);
if (DecryptedBuffer == null)
{
//failed to decrypt data
Disconnect();
return;
}
TotalReceived += PayloadLen;
using (PayloadReader pr = new PayloadReader(DecryptedBuffer))
{
OperationalSocket OpSocket = null;
if (ConnectionId > 0)
{
lock(OperationalSockets)
{
if (!OperationalSockets.TryGetValue(ConnectionId, out OpSocket))
{
//strange...
Disconnect();
return;
}
}
}
Type type = Headers.GetHeaderType(HeaderId);
if (type != null)
{
Header header = Header.DeSerialize(type, pr);
if(header == null)
{
Disconnect();
return;
}
uint MessageId = pr.ReadUInteger();
IMessage message = OpSocket != null ? OpSocket.MessageHandler.DeSerialize(pr, MessageId) : messageHandler.DeSerialize(pr, MessageId);
if (message != null)
{
message.RawSize = TotalReceived;
message.Header = header;
if (!HandShakeCompleted)
{
if (message.GetType() == typeof(MsgHandshake))
{
//process the handshake messages straight away
message.ProcessPayload(Client, null);
}
}
else
{
ProcessMessage(new SystemPacket(header, message, ConnectionId, OpSocket));
}
}
}
else
{
Disconnect();
return;
}
}
TotalReceived = 0;
PacketsIn++;
ReadOffset += PayloadLen;
ReadableDataLen -= PayloadLen;
ReceiveState = ReceiveType.Header;
}
}
}
int len = ReceiveState == ReceiveType.Header ? HEADER_SIZE : PayloadLen;
if (ReadOffset + len >= this.Buffer.Length)
{
//no more room for this data size, at the end of the buffer ?
//copy the buffer to the beginning
Array.Copy(this.Buffer, ReadOffset, this.Buffer, 0, ReadableDataLen);
WriteOffset = ReadableDataLen;
ReadOffset = 0;
}
else
{
//payload fits in the buffer from the current offset
//use BytesTransferred to write at the end of the payload
//so that the data is not split
WriteOffset += BytesTransferred;
}
if (Buffer.Length - WriteOffset > 0)
{
Handle.BeginReceive(this.Buffer, WriteOffset, Buffer.Length - WriteOffset, SocketFlags.None, AynsReceive, null);
}
else
{
//Shoudln't be even possible... very strange
Disconnect();
}
}
catch(Exception ex)
{
//unexpected error, client might have disconnected itself, or else report this error
SysLogger.Log(ex.Message, SysLogType.Error);
Disconnect();
return;
}
}
private void AynsReceive(IAsyncResult result)
{
int BytesTransferred = -1;
try
{
BytesTransferred = Handle.EndReceive(result);
SysLogger.Log("Received " + BytesTransferred, SysLogType.Network);
if (BytesTransferred <= 0)
{
Disconnect();
return;
}
}
catch (Exception ex)
{
SysLogger.Log(ex.Message, SysLogType.Error);
Disconnect();
return;
}
try
{
//let's check the certificate
if (Client.Server != null && Client.Server.serverProperties != null)
{
if (Client.ConnectionTime > Client.Server.serverProperties.ClientTimeConnected)
{
//we need to wait till the time is right
Disconnect();
return;
}
}
this.LastPacketRecvSW = Stopwatch.StartNew();
ReadableDataLen += BytesTransferred;
DataIn += (ulong)BytesTransferred;
bool Process = true;
while (Process)
{
if (ReceiveState == ReceiveType.Header)
{
Process = ReadableDataLen >= HEADER_SIZE;
if (ReadableDataLen >= HEADER_SIZE)
{
lock (HeaderEncryption)
{
headerConfuser.Deobfuscate(ref Buffer, ReadOffset);
HeaderEncryption.Decrypt(Buffer, ReadOffset, HEADER_SIZE);
}
using (PayloadReader pr = new PayloadReader(Buffer))
{
pr.Position = ReadOffset;
PayloadLen = pr.ReadThreeByteInteger();
CurPacketId = pr.ReadByte();
ConnectionId = pr.ReadUShort();
HeaderId = pr.ReadUShort();
HeaderChecksum = pr.ReadByte();
FeatureId = pr.ReadInteger();
}
byte ReChecksum = 0; //re-calculate the checksum
ReChecksum += (byte)PayloadLen;
ReChecksum += CurPacketId;
ReChecksum += (byte)ConnectionId;
ReChecksum += (byte)HeaderId;
ReChecksum += (byte)FeatureId;
if (ReChecksum != HeaderChecksum ||
PayloadLen >= MAX_PACKET_SIZE ||
PayloadLen < 0)
{
Disconnect();
return;
}
if (PayloadLen > Buffer.Length)
{
ResizeBuffer(PayloadLen);
}
TotalReceived = HEADER_SIZE;
ReadableDataLen -= HEADER_SIZE;
ReadOffset += HEADER_SIZE;
ReceiveState = ReceiveType.Payload;
}
}
else if (ReceiveState == ReceiveType.Payload)
{
Process = ReadableDataLen >= PayloadLen;
if (ReadableDataLen >= PayloadLen)
{
byte[] DecryptedBuffer = null;
int DecryptedBuffLen = 0;
messageHandler.DecryptMessage(this, Buffer, ReadOffset, PayloadLen, ref DecryptedBuffer, ref DecryptedBuffLen);
if (DecryptedBuffer == null)
{
//failed to decrypt data
Disconnect();
return;
}
TotalReceived += PayloadLen;
using (PayloadReader pr = new PayloadReader(DecryptedBuffer))
{
OperationalSocket OpSocket = null;
if (ConnectionId > 0)
{
lock (OperationalSockets)
{
if (!OperationalSockets.TryGetValue(ConnectionId, out OpSocket))
{
//strange...
Disconnect();
return;
}
}
}
Type type = Headers.GetHeaderType(HeaderId);
if (type != null)
{
Header header = Header.DeSerialize(type, pr);
if (header == null)
{
Disconnect();
return;
}
uint MessageId = pr.ReadUInteger();
IMessage message = OpSocket != null?OpSocket.MessageHandler.DeSerialize(pr, MessageId) : messageHandler.DeSerialize(pr, MessageId);
if (message != null)
{
message.RawSize = TotalReceived;
message.Header = header;
if (!HandShakeCompleted)
{
if (message.GetType() == typeof(MsgHandshake))
{
//process the handshake messages straight away
message.ProcessPayload(Client, null);
}
}
else
{
ProcessMessage(new SystemPacket(header, message, ConnectionId, OpSocket));
}
}
}
else
{
Disconnect();
return;
}
}
TotalReceived = 0;
PacketsIn++;
ReadOffset += PayloadLen;
ReadableDataLen -= PayloadLen;
ReceiveState = ReceiveType.Header;
}
}
}
int len = ReceiveState == ReceiveType.Header ? HEADER_SIZE : PayloadLen;
if (ReadOffset + len >= this.Buffer.Length)
{
//no more room for this data size, at the end of the buffer ?
//copy the buffer to the beginning
Array.Copy(this.Buffer, ReadOffset, this.Buffer, 0, ReadableDataLen);
WriteOffset = ReadableDataLen;
ReadOffset = 0;
}
else
{
//payload fits in the buffer from the current offset
//use BytesTransferred to write at the end of the payload
//so that the data is not split
WriteOffset += BytesTransferred;
}
if (Buffer.Length - WriteOffset > 0)
{
Handle.BeginReceive(this.Buffer, WriteOffset, Buffer.Length - WriteOffset, SocketFlags.None, AynsReceive, null);
}
else
{
//Shoudln't be even possible... very strange
Disconnect();
}
}
catch (Exception ex)
{
//unexpected error, client might have disconnected itself, or else report this error
SysLogger.Log(ex.Message, SysLogType.Error);
Disconnect();
return;
}
}
