/// <summary>
/// Send server discovery request to a remote host, not necessarily on
/// the local network
/// </summary>
public void DiscoverKnownServer(string ipOrHostName, int serverPort)
{
IPAddress ip = NetUtil.Resolve(this.Log, ipOrHostName);
NetMessage msg = NetDiscovery.EncodeRequest(this);
SendSingleMessageAtOnce(msg, null, new IPEndPoint(ip, serverPort));
}
public void DiscoverLocalServers(int serverPort)
{
IPEndPoint broadcast = new IPEndPoint(IPAddress.Broadcast, serverPort);
NetMessage msg = NetDiscovery.EncodeRequest(this);
Log.Info("Broadcasting server discovery ping...");
// special send style; can't use simulated lag due to socket options
try
{
m_socket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.Broadcast, true);
m_sendBuffer.ResetWritePointer();
msg.Encode(null, m_sendBuffer);
int bytesSent = m_socket.SendTo(m_sendBuffer.Data, 0, m_sendBuffer.LengthBytes, SocketFlags.None, broadcast);
Log.Verbose(string.Format(CultureInfo.InvariantCulture, "Sent {0} bytes to {1}", bytesSent, broadcast));
return;
}
catch (SocketException sex)
{
if (sex.SocketErrorCode == SocketError.ConnectionReset ||
sex.SocketErrorCode == SocketError.ConnectionRefused ||
sex.SocketErrorCode == SocketError.ConnectionAborted)
{
Log.Warning("Remote socket forcefully closed: " + sex.SocketErrorCode);
return;
}
Log.Warning("Execute SocketException: " + sex.SocketErrorCode);
return;
}
finally
{
m_socket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.Broadcast, false);
}
}
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);
}
}
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);
}
}