internal void Encode(NetConnection connection, NetBuffer intoBuffer)
{
if (m_type == NetMessageType.None)
m_type = NetMessageType.User;
intoBuffer.Write((byte)m_type, 3);
switch(m_type)
{
case NetMessageType.UserFragmented:
case NetMessageType.User:
case NetMessageType.Acknowledge:
case NetMessageType.AcknowledgeBitField:
intoBuffer.Write((byte)m_sequenceChannel, 5); // encode channel
intoBuffer.Write(m_sequenceNumber, 12); // encode sequence number
break;
}
int byteLen = (m_buffer == null ? 0 : m_buffer.LengthBytes);
if (m_type == NetMessageType.UserFragmented || m_type == NetMessageType.User || m_type == NetMessageType.Discovery || m_type == NetMessageType.Handshake)
intoBuffer.Write(byteLen, 12); // encode length
// encode payload
if (byteLen > 0)
intoBuffer.Write(m_buffer.Data, 0, byteLen);
return;
}
internal int ExecuteSend(NetBuffer buffer, NetConnection connection, IPEndPoint remoteEP)
{
if (buffer.LengthBytes < 0)
{
Log.Warning("ExecuteSend passed 0 bytes to send");
return 0;
}
#if DEBUG
if (connection != null)
{
if (connection.Configuration.SimulateLagLoss && m_lagLoss != null)
return m_lagLoss.ExecuteSend(this, buffer, connection, remoteEP);
}
#endif
// encrypt
if (connection != null && connection.m_encryption.SymmetricEncryptionKeyBytes != null)
{
// Log.Debug("SEND: Encrypting packet using key: " + Convert.ToBase64String(connection.SymmetricEncryptionKey));
connection.m_encryption.EncryptSymmetric(buffer);
}
try
{
int bytesSent = m_socket.SendTo(buffer.Data, 0, buffer.LengthBytes, SocketFlags.None, remoteEP);
Debug.Assert(bytesSent == buffer.LengthBytes, "Ouch, sent partial UDP message?!");
//Log.Verbose(string.Format(CultureInfo.InvariantCulture, "Sent {0} bytes to {1}", bytesSent, remoteEP));
return bytesSent;
}
catch (SocketException sex)
{
if (sex.SocketErrorCode == SocketError.WouldBlock)
{
// send buffer overflow?
#if DEBUG
Log.Error("SocketException.WouldBlock thrown during sending; send buffer overflow? Increase buffer using NetAppConfiguration.SendBufferSize");
throw new NetException("SocketException.WouldBlock thrown during sending; send buffer overflow? Increase buffer using NetAppConfiguration.SendBufferSize", sex);
#else
// let reliability handle it, but log warning
Log.Warning("Network send buffer overflow");
#endif
}
if (sex.SocketErrorCode == SocketError.ConnectionReset ||
sex.SocketErrorCode == SocketError.ConnectionRefused ||
sex.SocketErrorCode == SocketError.ConnectionAborted)
{
Log.Warning("Remote socket forcefully closed: " + sex.SocketErrorCode);
if (connection != null)
connection.Disconnect("Socket forcefully closed: " + sex.SocketErrorCode);
return 0;
}
Log.Warning("Execute SocketException: " + sex.SocketErrorCode);
return 0;
}
}
public int ExecuteSend(NetBase netBase, NetBuffer buffer, NetConnection connection, IPEndPoint remoteEP)
{
int len = buffer.LengthBytes;
#if DEBUG
if (connection != null)
{
NetConnectionConfiguration config = connection.Configuration;
if (config.LossChance > 0.0f && NetRandom.Default.Chance(config.LossChance))
{
//m_log.Debug("(simulating loss of sent packet)");
return len;
}
if (config.LagDelayChance > 0.0f && NetRandom.Default.Chance(config.LagDelayChance))
{
float delayAmount = config.LagDelayMinimum + (NetRandom.Default.NextFloat() * config.LagDelayVariance);
DelayedPacket pk = new DelayedPacket();
pk.Data = new byte[len];
Array.Copy(buffer.Data, pk.Data, buffer.LengthBytes);
pk.DelayAmount = delayAmount;
pk.DelayedUntil = NetTime.Now + delayAmount;
pk.RemoteEP = remoteEP;
m_delayed.Add(pk);
//m_log.Debug("(queueing packet for " + (int)(pk.DelayAmount * 1000.0f) + " ms)");
return len;
}
}
#endif
try
{
int bytesSent = netBase.m_socket.SendTo(buffer.Data, 0, len, SocketFlags.None, remoteEP);
m_log.Verbose(string.Format(CultureInfo.InvariantCulture, "Sent {0} bytes to {1}", bytesSent, remoteEP));
#if DEBUG
if (connection != null)
{
NetConnectionConfiguration config = connection.Configuration;
if (NetRandom.Default.Chance(config.DuplicatedPacketChance))
{
m_log.Debug("(simulating send packet duplication)");
netBase.m_socket.SendTo(buffer.Data, 0, buffer.LengthBytes, SocketFlags.None, remoteEP);
}
}
#endif
return bytesSent;
}
catch (SocketException sex)
{
if (sex.SocketErrorCode == SocketError.ConnectionReset ||
sex.SocketErrorCode == SocketError.ConnectionRefused ||
sex.SocketErrorCode == SocketError.ConnectionAborted)
{
m_log.Warning("Remote socket forcefully closed: " + sex.SocketErrorCode);
if (connection != null)
connection.Disconnect("Socket forcefully closed: " + sex.SocketErrorCode);
return 0;
}
m_log.Warning("Execute SocketException: " + sex.SocketErrorCode);
return 0;
}
}
/// <summary>
/// Create a net message
/// </summary>
public NetMessage()
{
m_type = NetMessageType.User;
System.Diagnostics.Debug.Assert(NetBase.CurrentContext != null, "No network context; create a NetClient or NetServer first");
m_buffer = new NetBuffer(NetBase.CurrentContext.Configuration.DefaultNetMessageBufferSize);
}
protected void InitBase(NetAppConfiguration config, NetLog log)
{
if (config == null)
throw new ArgumentNullException("config");
if (log == null)
throw new ArgumentNullException("log");
IsLittleEndian = BitConverter.IsLittleEndian;
//if (BitConverter.IsLittleEndian)
BitWriter = new LittleEndianBitWriter();
//else
// BitWriter = new BigEndianBitWriter();
Configuration = config;
Log = log;
Configuration.m_isLocked = true; // prevent changes
// validate config
if (config.ApplicationIdentifier == NetConstants.DefaultApplicationIdentifier)
log.Error("Warning! ApplicationIdentifier not set in configuration!");
if (this is NetServer)
{
if (config.MaximumConnections == -1)
throw new ArgumentException("MaximumConnections must be set in configuration!");
if (config.ServerName == NetConstants.DefaultServerName)
log.Warning("Warning! Server name not set!");
}
// create buffers
m_sendBuffer = new NetBuffer(config.SendBufferSize);
m_receiveBuffer = new NetBuffer(config.ReceiveBufferSize);
// Bind to port
try
{
IPEndPoint iep = new IPEndPoint(IPAddress.Any, config.Port);
EndPoint ep = (EndPoint)iep;
m_socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
m_socket.Blocking = false;
m_socket.Bind(ep);
if (iep.Port != 0)
Log.Info("Bound to port " + iep.Port);
}
catch (SocketException sex)
{
if (sex.SocketErrorCode != SocketError.AddressAlreadyInUse)
throw new NetException("Failed to bind to port " + config.Port + " - Address already in use!", sex);
}
catch (Exception ex)
{
throw new NetException("Failed to bind to port " + config.Port, ex);
}
m_socket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReceiveBuffer, config.ReceiveBufferSize);
m_socket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.SendBuffer, config.SendBufferSize);
m_senderRemote = (EndPoint)new IPEndPoint(IPAddress.Any, 0);
#if DEBUG
m_lagLoss = new NetLogLossInducer(log);
#endif
return;
}
internal NetMessage(NetMessageType tp, int initialCapacity)
{
m_type = tp;
m_buffer = new NetBuffer(initialCapacity);
}
/// <summary>
/// Create a message with specified initial capacity in bytes
/// </summary>
public NetMessage(int initialCapacity)
{
m_type = NetMessageType.User;
m_buffer = new NetBuffer(initialCapacity);
}
/// <summary>
/// Decrypt using XTEA algo and verify CRC
/// </summary>
/// <returns>true for success, false for failure</returns>
internal bool DecryptSymmetric(NetBuffer buffer)
{
int bufLen = buffer.LengthBytes;
if (bufLen % 8 != 0)
{
if (NetBase.CurrentContext != null && NetBase.CurrentContext.Log != null)
NetBase.CurrentContext.Log.Info("Bad buffer size in DecryptSymmetricInPlace()");
return false;
}
//NetBase.CurrentContext.Log.Debug.Debug("Decrypting using key: " + Convert.ToBase64String(m_xtea.Key));
// decrypt
for (int i = 0; i < bufLen; i += 8)
m_xtea.DecryptBlock(buffer.Data, i, buffer.Data, i);
int numPadBits = buffer.Data[bufLen - 1];
buffer.Data[bufLen - 1] = 0; // zap for correct crc calculation
int dataBits = (bufLen * 8) - (24 + numPadBits); // include pad and crc
buffer.ResetReadPointer(dataBits);
ushort statedCrc = buffer.ReadUInt16();
// zap crc to be able to compare
buffer.ResetWritePointer(dataBits);
buffer.Write((ushort)0);
ushort dataCrc = Checksum.Adler16(buffer.Data, 0, bufLen);
//NetBase.CurrentContext.Log.Debug("Plain (len " + bufLen + "): " + Convert.ToBase64String(buffer.Data, 0, bufLen) + " Stated CRC: " + statedCrc + " Calc: " + realCrc);
if (statedCrc != dataCrc)
{
if (NetBase.CurrentContext != null && NetBase.CurrentContext.Log != null)
NetBase.CurrentContext.Log.Warning("CRC failure; expected " + dataCrc + " found " + statedCrc + " dropping packet!");
return false;
}
// clean up
buffer.LengthBits = dataBits;
buffer.ResetReadPointer();
return true;
}
public static bool SimpleUnitTest()
{
// encryption test
NetEncryption enc = new NetEncryption();
byte[] key = new byte[16];
NetRandom.Default.NextBytes(key);
enc.SetSymmetricKey(key);
byte[] data = Encoding.ASCII.GetBytes("Michael"); // 7 bytes
byte[] correct = new byte[data.Length];
data.CopyTo(correct, 0);
NetBuffer buf = new NetBuffer(data);
enc.EncryptSymmetric(buf);
bool ok = enc.DecryptSymmetric(buf);
if (!ok)
return false;
// compare
if (buf.LengthBytes != correct.Length)
return false;
for (int i = 0; i < correct.Length; i++)
if (buf.Data[i] != correct[i])
return false;
return true;
}
internal NetMessage(NetBuffer reuseBuffer)
{
m_buffer = reuseBuffer;
}
/// <summary>
/// Append a CRC checksum and encrypt data in place using XTEA
/// </summary>
internal void EncryptSymmetric(NetBuffer buffer)
{
//string plain = Convert.ToBase64String(buffer.Data, 0, buffer.LengthBytes);
int bufferLen = buffer.LengthBytes;
// calculate number of pad bits
int dataBits = buffer.LengthBits;
int bitsNeeded = dataBits + 24; // 24 extra for crc and num-pad-bits
int totalBits = bitsNeeded + (64 - (bitsNeeded % 64));
int padBits = totalBits - bitsNeeded;
// write to ensure zeroes in buffer (crc and num-pad-bits space)
buffer.Write((uint)0, 24);
if (padBits > 0)
buffer.Write((ulong)0, padBits);
int writePadBitsPosition = buffer.LengthBits - 8;
// write crc
ushort crc = Checksum.Adler16(buffer.Data, 0, buffer.LengthBytes);
buffer.ResetWritePointer(dataBits);
buffer.Write(crc);
// write num-pad-bits in LAST byte
buffer.ResetWritePointer(writePadBitsPosition);
buffer.Write((byte)padBits);
// encrypt in place
int ptr = 0;
bufferLen = buffer.LengthBytes;
while (ptr < bufferLen)
{
m_xtea.EncryptBlock(buffer.Data, ptr, buffer.Data, ptr);
ptr += 8;
}
return;
}
/// <summary>
/// Create a message with specified initial capacity in bytes
/// </summary>
public NetMessage(int initialCapacity)
{
m_type = NetMessageType.User;
m_buffer = new NetBuffer(initialCapacity);
}
internal NetMessage(NetMessageType tp, byte[] payload)
{
m_type = tp;
m_buffer = new NetBuffer(payload);
}
internal NetMessage(NetMessageType tp, int initialCapacity)
{
m_type = tp;
m_buffer = new NetBuffer(initialCapacity);
}
internal static NetMessage Decode(NetBuffer buffer)
{
try
{
NetMessage retval = new NetMessage(true);
NetMessageType type = (NetMessageType)buffer.ReadByte(3);
retval.m_type = type;
switch (type)
{
case NetMessageType.None:
// packet padding (due to encryption); we've reached the end
return null;
case NetMessageType.User:
case NetMessageType.UserFragmented:
case NetMessageType.Acknowledge:
case NetMessageType.AcknowledgeBitField:
retval.m_sequenceChannel = (NetChannel)buffer.ReadByte(5);
retval.m_sequenceNumber = (ushort)buffer.ReadUInt32(12);
break;
}
int msgLen = 0;
switch (type)
{
case NetMessageType.User:
case NetMessageType.UserFragmented:
msgLen = (int)buffer.ReadUInt32(12);
break;
case NetMessageType.Acknowledge:
msgLen = 0;
break;
case NetMessageType.AcknowledgeBitField:
msgLen = 4;
break;
case NetMessageType.Discovery:
msgLen = (int)buffer.ReadUInt32(12);
break;
case NetMessageType.Handshake:
msgLen = (int)buffer.ReadUInt32(12);
break;
case NetMessageType.PingPong:
msgLen = 3;
break;
}
byte[] payload = null;
if (msgLen > 0)
payload = buffer.ReadBytes(msgLen);
retval.m_buffer = new NetBuffer(payload);
return retval;
}
catch
{
NetBase.CurrentContext.Log.Warning("Failed to decode NetMessage from buffer!");
return null;
}
}
internal override void HandlePacket(NetBuffer buffer, int bytesReceived, IPEndPoint senderEndpoint)
{
double now = NetTime.Now;
NetConnection sender = FindConnection(senderEndpoint);
if (sender != null)
{
sender.m_lastHeardFromRemote = now;
if (sender.m_encryption.SymmetricEncryptionKeyBytes != null)
{
bool ok = sender.m_encryption.DecryptSymmetric(buffer);
if (!ok)
{
Log.Warning("Failed to decrypt packet from client " + sender);
return;
}
}
}
try
{
NetMessage response;
int messagesReceived = 0;
int usrMessagesReceived = 0;
int ackMessagesReceived = 0;
while (buffer.ReadBitsLeft > 7)
{
NetMessage msg = NetMessage.Decode(buffer);
if (msg == null)
break; // done
messagesReceived++;
msg.Sender = sender;
switch (msg.m_type)
{
case NetMessageType.Acknowledge:
case NetMessageType.AcknowledgeBitField:
if (sender == null)
{
Log.Warning("Received Ack from not-connected source!");
}
else
{
//Log.Debug("Received ack " + msg.SequenceChannel + "|" + msg.SequenceNumber);
sender.ReceiveAcknowledge(msg);
ackMessagesReceived++;
}
break;
case NetMessageType.Handshake:
NetHandshakeType tp = (NetHandshakeType)msg.ReadByte();
if (tp == NetHandshakeType.ConnectResponse)
{
Log.Warning("Received ConnectResponse?!");
}
else if (tp == NetHandshakeType.Connect)
{
if (sender == null)
{
NetHandshake.HandleConnect(msg, this, senderEndpoint);
}
else
{
// resend response
NetHandshake.SendConnectResponse(this, sender, senderEndpoint);
Log.Verbose("Redundant Connect received; resending response");
}
}
else if (tp == NetHandshakeType.ConnectionEstablished)
{
if (sender == null)
{
Log.Warning("Received ConnectionEstablished, but no sender connection?!");
}
else
{
float rt = (float)(now - sender.m_firstSentHandshake);
sender.m_ping.Initialize(rt);
ushort remoteValue = msg.ReadUInt16();
sender.RemoteClockOffset = NetTime.CalculateOffset(now, remoteValue, rt);
Log.Verbose("Reinitializing remote clock offset to " + sender.RemoteClockOffset + " ms (roundtrip " + NetUtil.SecToMil(rt) + " ms)");
if (sender.Status == NetConnectionStatus.Connected)
{
Log.Verbose("Redundant ConnectionEstablished received");
}
else
{
Log.Debug("Connection established");
sender.SetStatus(NetConnectionStatus.Connected, "Connected by established");
}
}
}
else
{
// disconnected
if (sender == null)
{
Log.Warning("Disconnected received from unconnected source: " + senderEndpoint);
return;
}
string reason = msg.ReadString();
sender.Disconnected(reason);
}
break;
case NetMessageType.Discovery:
Log.Debug("Answering discovery response from " + senderEndpoint);
response = NetDiscovery.EncodeResponse(this);
SendSingleMessageAtOnce(response, null, senderEndpoint);
break;
case NetMessageType.PingPong:
if (sender == null)
return;
bool isPong = msg.ReadBoolean();
bool isOptimizeInfo = msg.ReadBoolean();
if (isOptimizeInfo)
{
// DON'T handle optimizeinfo... only clients should adapt to server ping info
} else if (isPong)
{
if (sender.Status == NetConnectionStatus.Connected)
sender.m_ping.HandlePong(now, msg);
}
else
{
NetPing.ReplyPong(msg, sender); // send pong
}
break;
case NetMessageType.User:
case NetMessageType.UserFragmented:
usrMessagesReceived++;
if (sender == null)
{
Log.Warning("User message received from unconnected source: " + senderEndpoint);
return; // don't handle user messages from unconnected sources
}
if (sender.Status == NetConnectionStatus.Connecting)
sender.SetStatus(NetConnectionStatus.Connected, "Connected by user message");
sender.ReceiveMessage(now, msg);
break;
default:
Log.Warning("Bad message type: " + msg);
break;
}
}
if (sender != null)
{
NetStatistics stats = sender.Statistics;
stats.PacketsReceived++;
stats.MessagesReceived += messagesReceived;
stats.UserMessagesReceived += usrMessagesReceived;
stats.AckMessagesReceived += ackMessagesReceived;
stats.BytesReceived += bytesReceived;
}
}
catch (Exception ex)
{
Log.Error("Failed to parse packet correctly; read/write mismatch? " + ex);
}
}
/// <summary>
/// Create a net message
/// </summary>
public NetMessage()
{
m_type = NetMessageType.User;
System.Diagnostics.Debug.Assert(NetBase.CurrentContext != null, "No network context; create a NetClient or NetServer first");
m_buffer = new NetBuffer(NetBase.CurrentContext.Configuration.DefaultNetMessageBufferSize);
}
internal override void HandlePacket(NetBuffer buffer, int bytesReceived, IPEndPoint sender)
{
double now = NetTime.Now;
try
{
NetMessage msg;
if (m_serverConnection == null || m_serverConnection.Status == NetConnectionStatus.Disconnected)
{
//
// unconnected packet
//
msg = NetMessage.Decode(buffer);
if (msg == null)
{
Log.Warning("Malformed NetMessage?");
return; // malformed?
}
Log.Verbose("Received unconnected message: " + msg);
// discovery response?
if (msg.m_type == NetMessageType.Discovery)
{
NetServerInfo info = NetDiscovery.DecodeResponse(msg, sender);
if (ServerDiscovered != null)
ServerDiscovered(this, new NetServerDiscoveredEventArgs(info));
return;
}
if (m_serverConnection != null && sender.Equals(m_serverConnection.RemoteEndpoint))
{
// we have m_serverConnection, but status is disconnected
Log.Warning("Received " + buffer.LengthBytes + " from server; but we're disconnected!");
return;
}
Log.Warning("Received " + buffer.LengthBytes + " bytes from non-server source: " + sender + "(server is " + m_serverConnection.RemoteEndpoint + ")");
return;
}
// decrypt in place
if (m_serverConnection.m_encryption.SymmetricEncryptionKeyBytes != null)
{
byte[] savedBuffer = null;
if (m_serverConnection.Status == NetConnectionStatus.Connecting)
{
// special case; save buffer in case we get unencrypted response
savedBuffer = new byte[buffer.LengthBytes];
Array.Copy(buffer.Data, 0, savedBuffer, 0, buffer.LengthBytes);
}
bool ok = m_serverConnection.m_encryption.DecryptSymmetric(buffer);
if (!ok)
{
// failed to decrypt; drop this packet UNLESS we're in a connecting state,
// in which case the server may want to tell us something
if (m_serverConnection.Status == NetConnectionStatus.Connecting)
{
// ok let this one thru unencrypted
Array.Copy(savedBuffer, buffer.Data, savedBuffer.Length);
}
else
{
Log.Warning("Failed to decrypt packet from server!");
return;
}
}
}
m_serverConnection.m_lastHeardFromRemote = now;
int messagesReceived = 0;
int usrMessagesReceived = 0;
int ackMessagesReceived = 0;
while (buffer.ReadBitsLeft > 7)
{
msg = NetMessage.Decode(buffer);
if (msg == null)
break; // done
messagesReceived++;
msg.Sender = m_serverConnection;
switch (msg.m_type)
{
case NetMessageType.Handshake:
NetHandshakeType tp = (NetHandshakeType)msg.ReadByte();
if (tp == NetHandshakeType.Connect || tp == NetHandshakeType.ConnectionEstablished)
{
Log.Warning("Client received " + tp + "?!");
}
else if (tp == NetHandshakeType.ConnectResponse)
{
if (m_serverConnection.Status != NetConnectionStatus.Connecting)
{
Log.Verbose("Received redundant ConnectResponse!");
break;
}
// Log.Debug("ConnectResponse received");
m_serverConnection.SetStatus(NetConnectionStatus.Connected, "Connected");
Log.Info("Connected to " + m_serverConnection.RemoteEndpoint);
// initialize ping to now - m_firstSentConnect
float initRoundtrip = (float)(now - m_serverConnection.m_firstSentHandshake);
m_serverConnection.m_ping.Initialize(initRoundtrip);
ushort remoteValue = msg.ReadUInt16();
m_serverConnection.RemoteClockOffset = NetTime.CalculateOffset(now, remoteValue, initRoundtrip);
Log.Verbose("Initializing remote clock offset to " + m_serverConnection.RemoteClockOffset + " ms (roundtrip " + NetUtil.SecToMil(initRoundtrip) + " ms)");
NetMessage established = new NetMessage(NetMessageType.Handshake, 3);
established.Write((byte)NetHandshakeType.ConnectionEstablished);
established.WriteSendStamp();
SendSingleMessageAtOnce(established, m_serverConnection, m_serverConnection.RemoteEndpoint);
}
else
{ // Disconnected
string reason = msg.ReadString();
m_serverConnection.SetStatus(NetConnectionStatus.Disconnected, reason);
}
break;
case NetMessageType.Acknowledge:
//Log.Debug("Received ack " + msg.SequenceChannel + "|" + msg.SequenceNumber);
m_serverConnection.ReceiveAcknowledge(msg);
ackMessagesReceived++;
break;
case NetMessageType.PingPong:
bool isPong = msg.ReadBoolean();
bool isOptimizeInfo = msg.ReadBoolean();
if (isOptimizeInfo)
{
m_serverConnection.m_ping.HandleOptimizeInfo(now, msg);
} else if (isPong)
{
if (m_serverConnection.Status == NetConnectionStatus.Connected)
m_serverConnection.m_ping.HandlePong(now, msg);
}
else
{
NetPing.ReplyPong(msg, m_serverConnection);
}
break;
case NetMessageType.User:
case NetMessageType.UserFragmented:
//Log.Debug("User message received; " + msg.m_buffer.LengthBytes + " bytes");
m_serverConnection.ReceiveMessage(now, msg);
usrMessagesReceived++;
break;
case NetMessageType.Discovery:
NetServerInfo info = NetDiscovery.DecodeResponse(msg, sender);
if (ServerDiscovered != null)
ServerDiscovered(this, new NetServerDiscoveredEventArgs(info));
break;
default:
Log.Warning("Client received " + msg.m_type + "?!");
break;
}
}
// add statistics
NetStatistics stats = m_serverConnection.Statistics;
stats.PacketsReceived++;
stats.MessagesReceived += messagesReceived;
stats.UserMessagesReceived += usrMessagesReceived;
stats.AckMessagesReceived += ackMessagesReceived;
stats.BytesReceived += bytesReceived;
}
catch (Exception ex)
{
Log.Error("Failed to parse packet correctly; read/write mismatch? " + ex);
}
}
internal NetMessage(NetMessageType tp, byte[] payload)
{
m_type = tp;
m_buffer = new NetBuffer(payload);
}
internal abstract void HandlePacket(NetBuffer buffer, int bytesReceived, IPEndPoint sender);
internal NetMessage(NetBuffer reuseBuffer)
{
m_buffer = reuseBuffer;
}
internal static NetMessage Decode(NetBuffer buffer)
{
try
{
NetMessage retval = new NetMessage(true);
NetMessageType type = (NetMessageType)buffer.ReadByte(3);
retval.m_type = type;
switch (type)
{
case NetMessageType.None:
// packet padding (due to encryption); we've reached the end
return(null);
case NetMessageType.User:
case NetMessageType.UserFragmented:
case NetMessageType.Acknowledge:
case NetMessageType.AcknowledgeBitField:
retval.m_sequenceChannel = (NetChannel)buffer.ReadByte(5);
retval.m_sequenceNumber = (ushort)buffer.ReadUInt32(12);
break;
}
int msgLen = 0;
switch (type)
{
case NetMessageType.User:
case NetMessageType.UserFragmented:
msgLen = (int)buffer.ReadUInt32(12);
break;
case NetMessageType.Acknowledge:
msgLen = 0;
break;
case NetMessageType.AcknowledgeBitField:
msgLen = 4;
break;
case NetMessageType.Discovery:
msgLen = (int)buffer.ReadUInt32(12);
break;
case NetMessageType.Handshake:
msgLen = (int)buffer.ReadUInt32(12);
break;
case NetMessageType.PingPong:
msgLen = 3;
break;
}
byte[] payload = null;
if (msgLen > 0)
{
payload = buffer.ReadBytes(msgLen);
}
retval.m_buffer = new NetBuffer(payload);
return(retval);
}
catch
{
NetBase.CurrentContext.Log.Warning("Failed to decode NetMessage from buffer!");
return(null);
}
}
