private void SendASDUInternal(ASDU asdu)
{
lock (socket) {
if (running == false)
{
throw new ConnectionException("not connected", new SocketException(10057));
}
if (useSendMessageQueue)
{
lock (waitingToBeSent) {
waitingToBeSent.Enqueue(asdu);
}
SendNextWaitingASDU();
}
else
{
if (IsSentBufferFull())
{
throw new ConnectionException("Flow control congestion. Try again later.");
}
SendIMessageAndUpdateSentASDUs(asdu);
}
}
}
/// <summary>
/// Enqueues the ASDU to the transmission queue.
/// </summary>
/// If an active connection exists the ASDU will be sent to the active client immediately. Otherwhise
/// the ASDU will be added to the transmission queue for later transmission.
/// <param name="asdu">ASDU to be sent</param>
public void EnqueueASDU(ASDU asdu)
{
if (serverMode == ServerMode.SINGLE_REDUNDANCY_GROUP)
{
asduQueue.EnqueueAsdu(asdu);
foreach (ServerConnection connection in allOpenConnections)
{
if (connection.IsActive)
{
connection.ASDUReadyToSend();
}
}
}
else
{
foreach (ServerConnection connection in allOpenConnections)
{
if (connection.IsActive)
{
connection.GetASDUQueue().EnqueueAsdu(asdu);
connection.ASDUReadyToSend();
}
}
}
}
public void SendACT_CON(ASDU asdu, bool negative)
{
asdu.Cot = CauseOfTransmission.ACTIVATION_CON;
asdu.IsNegative = negative;
SendASDU(asdu);
}
/// <summary>
/// Enqueues the ASDU to the transmission queue.
/// 将ASDU加入队列，并同时发送到当前激活的连接中
/// </summary>
/// If an active connection exists the ASDU will be sent to the active client immediately. Otherwhise
/// the ASDU will be added to the transmission queue for later transmission.
/// <param name="asdu">ASDU to be sent</param>
public void EnqueueASDU(ASDU asdu)
{
if (enqueuedASDUs == null)
{
enqueuedASDUs = new Queue <ASDU>();
}
if (enqueuedASDUs.Count == maxQueueSize)
{
enqueuedASDUs.Dequeue();
}
enqueuedASDUs.Enqueue(asdu);
Console.WriteLine("Queue contains " + enqueuedASDUs.Count + " messages");
foreach (ServerConnection connection in allOpenConnections)
{
//通知当前激活的连接，赶紧读取ASDU
if (connection.IsActive)
{
connection.ASDUReadyToSend();
}
}
}
public void SendACT_TERM(ASDU asdu)
{
asdu.Cot = CauseOfTransmission.ACTIVATION_TERMINATION;
asdu.IsNegative = false;
SendASDU(asdu);
}
/// <summary>
/// Sends a clock synchronization command (C_CS_NA_1 typeID: 103).
/// </summary>
/// <param name="ca">Common address</param>
/// <param name="time">the new time to set</param>
/// <exception cref="ConnectionException">description</exception>
public void SendClockSyncCommand(int ca, CP56Time2a time)
{
ASDU asdu = new ASDU(parameters, CauseOfTransmission.ACTIVATION, false, false, (byte)parameters.OriginatorAddress, ca, false);
asdu.AddInformationObject(new ClockSynchronizationCommand(0, time));
SendASDUInternal(asdu);
}
/// <summary>
/// Sends a read command (C_RD_NA_1 typeID: 102).
/// </summary>
///
/// This will send a read command C_RC_NA_1 (102) to the slave/outstation. The COT is always REQUEST (5).
/// It is used to implement the cyclical polling of data application function.
///
/// <param name="ca">Common address</param>
/// <param name="ioa">Information object address</param>
/// <exception cref="ConnectionException">description</exception>
public void SendReadCommand(int ca, int ioa)
{
ASDU asdu = new ASDU(parameters, CauseOfTransmission.REQUEST, false, false, (byte)parameters.OriginatorAddress, ca, false);
asdu.AddInformationObject(new ReadCommand(ioa));
SendASDUInternal(asdu);
}
/// <summary>
/// Sends the counter interrogation command (C_CI_NA_1 typeID: 101)
/// </summary>
/// <param name="cot">Cause of transmission</param>
/// <param name="ca">Common address</param>
/// <param name="qcc">Qualifier of counter interrogation command</param>
/// <exception cref="ConnectionException">description</exception>
public void SendCounterInterrogationCommand(CauseOfTransmission cot, int ca, byte qcc)
{
ASDU asdu = new ASDU(parameters, cot, false, false, (byte)parameters.OriginatorAddress, ca, false);
asdu.AddInformationObject(new CounterInterrogationCommand(0, qcc));
SendASDUInternal(asdu);
}
/// <summary>
/// Sends a test command (C_TS_NA_1 typeID: 104).
/// </summary>
///
/// Not required and supported by IEC 60870-5-104.
///
/// <param name="ca">Common address</param>
/// <exception cref="ConnectionException">description</exception>
public void SendTestCommand(int ca)
{
ASDU asdu = new ASDU(parameters, CauseOfTransmission.ACTIVATION, false, false, (byte)parameters.OriginatorAddress, ca, false);
asdu.AddInformationObject(new TestCommand());
SendASDUInternal(asdu);
}
/// <summary>
/// Sends a reset process command (C_RP_NA_1 typeID: 105).
/// </summary>
/// <param name="cot">Cause of transmission</param>
/// <param name="ca">Common address</param>
/// <param name="qrp">Qualifier of reset process command</param>
/// <exception cref="ConnectionException">description</exception>
public void SendResetProcessCommand(CauseOfTransmission cot, int ca, byte qrp)
{
ASDU asdu = new ASDU(parameters, CauseOfTransmission.ACTIVATION, false, false, (byte)parameters.OriginatorAddress, ca, false);
asdu.AddInformationObject(new ResetProcessCommand(0, qrp));
SendASDUInternal(asdu);
}
/// <summary>
/// Sends a test command with CP56Time2a time (C_TS_TA_1 typeID: 107).
/// </summary>
/// <param name="ca">Common address</param>
/// <param name="tsc">test sequence number</param>
/// <param name="time">test timestamp</param>
/// <exception cref="ConnectionException">description</exception>
public void SendTestCommandWithCP56Time2a(int ca, ushort tsc, CP56Time2a time)
{
ASDU asdu = new ASDU(parameters, CauseOfTransmission.ACTIVATION, false, false, (byte)parameters.OriginatorAddress, ca, false);
asdu.AddInformationObject(new TestCommandWithCP56Time2a(tsc, time));
SendASDUInternal(asdu);
}
/// <summary>
/// Sends the control command.
/// </summary>
///
/// The type ID has to match the type of the InformationObject!
///
/// C_SC_NA_1 -> SingleCommand
/// C_DC_NA_1 -> DoubleCommand
/// C_RC_NA_1 -> StepCommand
/// C_SC_TA_1 -> SingleCommandWithCP56Time2a
/// C_SE_NA_1 -> SetpointCommandNormalized
/// C_SE_NB_1 -> SetpointCommandScaled
/// C_SE_NC_1 -> SetpointCommandShort
/// C_BO_NA_1 -> Bitstring32Command
///
/// <param name="cot">Cause of transmission (use ACTIVATION to start a control sequence)</param>
/// <param name="ca">Common address</param>
/// <param name="sc">Information object of the command</param>
/// <exception cref="ConnectionException">description</exception>
public void SendControlCommand(CauseOfTransmission cot, int ca, InformationObject sc)
{
ASDU controlCommand = new ASDU(parameters, cot, false, false, (byte)parameters.OriginatorAddress, ca, false);
controlCommand.AddInformationObject(sc);
SendASDUInternal(controlCommand);
}
/// <summary>
/// Sends a delay acquisition command (C_CD_NA_1 typeID: 106).
/// </summary>
/// <param name="cot">Cause of transmission</param>
/// <param name="ca">Common address</param>
/// <param name="delay">delay for acquisition</param>
/// <exception cref="ConnectionException">description</exception>
public void SendDelayAcquisitionCommand(CauseOfTransmission cot, int ca, CP16Time2a delay)
{
ASDU asdu = new ASDU(parameters, CauseOfTransmission.ACTIVATION, false, false, (byte)parameters.OriginatorAddress, ca, false);
asdu.AddInformationObject(new DelayAcquisitionCommand(0, delay));
SendASDUInternal(asdu);
}
/// <summary>
/// 发送激活确认报文（镜像报文）
/// </summary>
/// <param name="asdu">原报文</param>
/// <param name="negative"></param>
public void SendACT_CON(ASDU asdu, bool negative)
{
//传送原因改下
asdu.Cot = CauseOfTransmission.ACTIVATION_CON;
//肯定/否定激活改进去
asdu.IsNegative = negative;
SendASDU(asdu);
}
/// <summary>
/// 发送ASDU
/// </summary>
/// <param name="asdu"></param>
public void SendASDU(ASDU asdu)
{
Frame frame = new T104Frame();
asdu.Encode(frame, parameters);
//发送I帧
sendIMessage(frame);
}
/// <summary>
/// 检查服务端的ASDU并发送？？
/// </summary>
private void checkServerQueue()
{
ASDU asdu = server.DequeueASDU();
if (asdu != null)
{
SendASDU(asdu);
}
}
/// <summary>
/// Send a response ASDU over this connection
/// </summary>
/// <exception cref="ConnectionException">Throws an exception if the connection is no longer active (e.g. because it has been closed by the other side).</exception>
/// <param name="asdu">The ASDU to send</param>
public void SendASDU(ASDU asdu)
{
if (isActive)
{
SendASDUInternal(asdu);
}
else
{
throw new ConnectionException("Connection not active");
}
}
/// <summary>
/// 准备发送ASDU，为啥这里要发送一次？难道是镜像报文？还需要再读读。。。
/// </summary>
public void ASDUReadyToSend()
{
if (isActive)
{
ASDU asdu = server.DequeueASDU();
if (asdu != null)
{
SendASDU(asdu);
}
}
}
/// <summary>
/// Enqueues the ASDU to the transmission queue.
/// </summary>
/// If an active connection exists the ASDU will be sent to the active client immediately. Otherwhise
/// the ASDU will be added to the transmission queue for later transmission.
/// <param name="asdu">ASDU to be sent</param>
public void EnqueueASDU(ASDU asdu)
{
if (enqueuedASDUs != null)
{
lock (enqueuedASDUs) {
if (oldestQueueEntry == -1)
{
oldestQueueEntry = 0;
latestQueueEntry = 0;
numberOfAsduInQueue = 1;
enqueuedASDUs [0].asdu.ResetFrame();
asdu.Encode(enqueuedASDUs [0].asdu, parameters);
enqueuedASDUs [0].entryTimestamp = SystemUtils.currentTimeMillis();
enqueuedASDUs [0].state = QueueEntryState.WAITING_FOR_TRANSMISSION;
}
else
{
latestQueueEntry = (latestQueueEntry + 1) % maxQueueSize;
if (latestQueueEntry == oldestQueueEntry)
{
oldestQueueEntry = (oldestQueueEntry + 1) % maxQueueSize;
}
else
{
numberOfAsduInQueue++;
}
enqueuedASDUs [latestQueueEntry].asdu.ResetFrame();
asdu.Encode(enqueuedASDUs [latestQueueEntry].asdu, parameters);
enqueuedASDUs [latestQueueEntry].entryTimestamp = SystemUtils.currentTimeMillis();
enqueuedASDUs [latestQueueEntry].state = QueueEntryState.WAITING_FOR_TRANSMISSION;
}
}
DebugLog("Queue contains " + numberOfAsduInQueue + " messages (oldest: " + oldestQueueEntry + " latest: " + latestQueueEntry + ")");
foreach (ServerConnection connection in allOpenConnections)
{
if (connection.IsActive)
{
connection.ASDUReadyToSend();
}
}
}
}
private void SendASDUInternal(ASDU asdu)
{
if (isActive)
{
lock (waitingASDUsHighPrio) {
BufferFrame frame = new BufferFrame(new byte[256], 6);
asdu.Encode(frame, parameters);
waitingASDUsHighPrio.Enqueue(frame);
}
SendWaitingASDUs();
}
}
private int SendIMessage(ASDU asdu)
{
BufferFrame frame = new BufferFrame(new byte[260], 6); /* reserve space for ACPI */
asdu.Encode(frame, parameters);
byte[] buffer = frame.GetBuffer();
int msgSize = frame.GetMsgSize(); /* ACPI + ASDU */
buffer [0] = 0x68;
/* set size field */
buffer [1] = (byte)(msgSize - 2);
buffer [2] = (byte)((sendSequenceNumber % 128) * 2);
buffer [3] = (byte)(sendSequenceNumber / 128);
buffer [4] = (byte)((receiveSequenceNumber % 128) * 2);
buffer [5] = (byte)(receiveSequenceNumber / 128);
if (running)
{
socket.NoDelay = true;
socket.Send(buffer, msgSize, SocketFlags.None);
sendSequenceNumber = (sendSequenceNumber + 1) % 32768;
statistics.SentMsgCounter++;
unconfirmedReceivedIMessages = 0;
if (sentMessageHandler != null)
{
sentMessageHandler(sentMessageHandlerParameter, buffer, msgSize);
}
return(sendSequenceNumber);
}
else
{
if (lastException != null)
{
throw new ConnectionException(lastException.Message, lastException);
}
else
{
throw new ConnectionException("not connected", new SocketException(10057));
}
}
}
public void EnqueueAsdu(ASDU asdu)
{
lock (enqueuedASDUs)
{
if (oldestQueueEntry == -1)
{
oldestQueueEntry = 0;
latestQueueEntry = 0;
numberOfAsduInQueue = 1;
enqueuedASDUs[0].asdu.ResetFrame();
asdu.Encode(enqueuedASDUs[0].asdu, parameters);
enqueuedASDUs[0].entryTimestamp = SystemUtils.currentTimeMillis();
enqueuedASDUs[0].state = QueueEntryState.WAITING_FOR_TRANSMISSION;
}
else
{
latestQueueEntry = (latestQueueEntry + 1) % maxQueueSize;
if (latestQueueEntry == oldestQueueEntry)
{
oldestQueueEntry = (oldestQueueEntry + 1) % maxQueueSize;
}
else
{
numberOfAsduInQueue++;
}
enqueuedASDUs[latestQueueEntry].asdu.ResetFrame();
asdu.Encode(enqueuedASDUs[latestQueueEntry].asdu, parameters);
enqueuedASDUs[latestQueueEntry].entryTimestamp = SystemUtils.currentTimeMillis();
enqueuedASDUs[latestQueueEntry].state = QueueEntryState.WAITING_FOR_TRANSMISSION;
}
}
DebugLog("Queue contains " + numberOfAsduInQueue + " messages (oldest: " + oldestQueueEntry + " latest: " + latestQueueEntry + ")");
}
private bool SendNextWaitingASDU()
{
bool sentAsdu = false;
if (running == false)
{
throw new ConnectionException("connection lost");
}
try {
lock (waitingToBeSent) {
while (waitingToBeSent.Count > 0)
{
if (IsSentBufferFull() == true)
{
break;
}
ASDU asdu = waitingToBeSent.Dequeue();
if (asdu != null)
{
SendIMessageAndUpdateSentASDUs(asdu);
sentAsdu = true;
}
else
{
break;
}
}
}
} catch (Exception) {
running = false;
throw new ConnectionException("connection lost");
}
return(sentAsdu);
}
private void SendIMessageAndUpdateSentASDUs(ASDU asdu)
{
lock (sentASDUs) {
int currentIndex = 0;
if (oldestSentASDU == -1)
{
oldestSentASDU = 0;
newestSentASDU = 0;
}
else
{
currentIndex = (newestSentASDU + 1) % maxSentASDUs;
}
sentASDUs [currentIndex].seqNo = SendIMessage(asdu);
sentASDUs [currentIndex].sentTime = SystemUtils.currentTimeMillis();
newestSentASDU = currentIndex;
PrintSendBuffer();
}
}
private bool checkMessage(Socket socket, byte[] buffer, int msgSize)
{
long currentTime = SystemUtils.currentTimeMillis();
if ((buffer [2] & 1) == 0) /* I format frame */
{
if (firstIMessageReceived == false)
{
firstIMessageReceived = true;
lastConfirmationTime = currentTime; /* start timeout T2 */
}
if (msgSize < 7)
{
DebugLog("I msg too small!");
return(false);
}
int frameSendSequenceNumber = ((buffer [3] * 0x100) + (buffer [2] & 0xfe)) / 2;
int frameRecvSequenceNumber = ((buffer [5] * 0x100) + (buffer [4] & 0xfe)) / 2;
DebugLog("Received I frame: N(S) = " + frameSendSequenceNumber + " N(R) = " + frameRecvSequenceNumber);
/* check the receive sequence number N(R) - connection will be closed on an unexpected value */
if (frameSendSequenceNumber != receiveSequenceNumber)
{
DebugLog("Sequence error: Close connection!");
return(false);
}
if (CheckSequenceNumber(frameRecvSequenceNumber) == false)
{
return(false);
}
receiveSequenceNumber = (receiveSequenceNumber + 1) % 32768;
unconfirmedReceivedIMessages++;
try {
ASDU asdu = new ASDU(parameters, buffer, 6, msgSize);
if (asduReceivedHandler != null)
{
asduReceivedHandler(asduReceivedHandlerParameter, asdu);
}
}
catch (ASDUParsingException e) {
DebugLog("ASDU parsing failed: " + e.Message);
return(false);
}
}
else if ((buffer [2] & 0x03) == 0x01) /* S format frame */
{
int seqNo = (buffer[4] + buffer[5] * 0x100) / 2;
DebugLog("Recv S(" + seqNo + ") (own sendcounter = " + sendSequenceNumber + ")");
if (CheckSequenceNumber(seqNo) == false)
{
return(false);
}
}
else if ((buffer [2] & 0x03) == 0x03) /* U format frame */
{
uMessageTimeout = 0;
if (buffer [2] == 0x43) // Check for TESTFR_ACT message
{
statistics.RcvdTestFrActCounter++;
DebugLog("RCVD TESTFR_ACT");
DebugLog("SEND TESTFR_CON");
socket.Send(TESTFR_CON_MSG);
statistics.SentMsgCounter++;
}
else if (buffer [2] == 0x83) /* TESTFR_CON */
{
DebugLog("RCVD TESTFR_CON");
statistics.RcvdTestFrConCounter++;
outStandingTestFRConMessages = 0;
}
else if (buffer [2] == 0x07) /* STARTDT ACT */
{
DebugLog("RCVD STARTDT_ACT");
socket.Send(STARTDT_CON_MSG);
statistics.SentMsgCounter++;
}
else if (buffer [2] == 0x0b) /* STARTDT_CON */
{
DebugLog("RCVD STARTDT_CON");
if (connectionHandler != null)
{
connectionHandler(connectionHandlerParameter, ConnectionEvent.STARTDT_CON_RECEIVED);
}
}
else if (buffer [2] == 0x23) /* STOPDT_CON */
{
DebugLog("RCVD STOPDT_CON");
if (connectionHandler != null)
{
connectionHandler(connectionHandlerParameter, ConnectionEvent.STOPDT_CON_RECEIVED);
}
}
}
else
{
DebugLog("Unknown message type");
return(false);
}
ResetT3Timeout();
return(true);
}
/// <summary>
/// Sends an arbitrary ASDU to the connected slave
/// </summary>
/// <param name="asdu">The ASDU to send</param>
public void SendASDU(ASDU asdu)
{
SendASDUInternal(asdu);
}
private void HandleASDU(ASDU asdu)
{
DebugLog("Handle received ASDU");
bool messageHandled = false;
switch (asdu.TypeId)
{
case TypeID.C_IC_NA_1: /* 100 - interrogation command */
DebugLog("Rcvd interrogation command C_IC_NA_1");
if ((asdu.Cot == CauseOfTransmission.ACTIVATION) || (asdu.Cot == CauseOfTransmission.DEACTIVATION))
{
if (server.interrogationHandler != null)
{
InterrogationCommand irc = (InterrogationCommand)asdu.GetElement(0);
if (server.interrogationHandler(server.InterrogationHandlerParameter, this, asdu, irc.QOI))
{
messageHandled = true;
}
}
}
else
{
asdu.Cot = CauseOfTransmission.UNKNOWN_CAUSE_OF_TRANSMISSION;
this.SendASDUInternal(asdu);
}
break;
case TypeID.C_CI_NA_1: /* 101 - counter interrogation command */
DebugLog("Rcvd counter interrogation command C_CI_NA_1");
if ((asdu.Cot == CauseOfTransmission.ACTIVATION) || (asdu.Cot == CauseOfTransmission.DEACTIVATION))
{
if (server.counterInterrogationHandler != null)
{
CounterInterrogationCommand cic = (CounterInterrogationCommand)asdu.GetElement(0);
if (server.counterInterrogationHandler(server.counterInterrogationHandlerParameter, this, asdu, cic.QCC))
{
messageHandled = true;
}
}
}
else
{
asdu.Cot = CauseOfTransmission.UNKNOWN_CAUSE_OF_TRANSMISSION;
this.SendASDUInternal(asdu);
}
break;
case TypeID.C_RD_NA_1: /* 102 - read command */
DebugLog("Rcvd read command C_RD_NA_1");
if (asdu.Cot == CauseOfTransmission.REQUEST)
{
DebugLog("Read request for object: " + asdu.Ca);
if (server.readHandler != null)
{
ReadCommand rc = (ReadCommand)asdu.GetElement(0);
if (server.readHandler(server.readHandlerParameter, this, asdu, rc.ObjectAddress))
{
messageHandled = true;
}
}
}
else
{
asdu.Cot = CauseOfTransmission.UNKNOWN_CAUSE_OF_TRANSMISSION;
this.SendASDUInternal(asdu);
}
break;
case TypeID.C_CS_NA_1: /* 103 - Clock synchronization command */
DebugLog("Rcvd clock sync command C_CS_NA_1");
if (asdu.Cot == CauseOfTransmission.ACTIVATION)
{
if (server.clockSynchronizationHandler != null)
{
ClockSynchronizationCommand csc = (ClockSynchronizationCommand)asdu.GetElement(0);
if (server.clockSynchronizationHandler(server.clockSynchronizationHandlerParameter,
this, asdu, csc.NewTime))
{
messageHandled = true;
}
}
}
else
{
asdu.Cot = CauseOfTransmission.UNKNOWN_CAUSE_OF_TRANSMISSION;
this.SendASDUInternal(asdu);
}
break;
case TypeID.C_TS_NA_1: /* 104 - test command */
DebugLog("Rcvd test command C_TS_NA_1");
if (asdu.Cot != CauseOfTransmission.ACTIVATION)
{
asdu.Cot = CauseOfTransmission.UNKNOWN_CAUSE_OF_TRANSMISSION;
}
else
{
asdu.Cot = CauseOfTransmission.ACTIVATION_CON;
}
this.SendASDUInternal(asdu);
messageHandled = true;
break;
case TypeID.C_RP_NA_1: /* 105 - Reset process command */
DebugLog("Rcvd reset process command C_RP_NA_1");
if (asdu.Cot == CauseOfTransmission.ACTIVATION)
{
if (server.resetProcessHandler != null)
{
ResetProcessCommand rpc = (ResetProcessCommand)asdu.GetElement(0);
if (server.resetProcessHandler(server.resetProcessHandlerParameter,
this, asdu, rpc.QRP))
{
messageHandled = true;
}
}
}
else
{
asdu.Cot = CauseOfTransmission.UNKNOWN_CAUSE_OF_TRANSMISSION;
this.SendASDUInternal(asdu);
}
break;
case TypeID.C_CD_NA_1: /* 106 - Delay acquisition command */
DebugLog("Rcvd delay acquisition command C_CD_NA_1");
if ((asdu.Cot == CauseOfTransmission.ACTIVATION) || (asdu.Cot == CauseOfTransmission.SPONTANEOUS))
{
if (server.delayAcquisitionHandler != null)
{
DelayAcquisitionCommand dac = (DelayAcquisitionCommand)asdu.GetElement(0);
if (server.delayAcquisitionHandler(server.delayAcquisitionHandlerParameter,
this, asdu, dac.Delay))
{
messageHandled = true;
}
}
}
else
{
asdu.Cot = CauseOfTransmission.UNKNOWN_CAUSE_OF_TRANSMISSION;
this.SendASDUInternal(asdu);
}
break;
}
if ((messageHandled == false) && (server.asduHandler != null))
{
if (server.asduHandler(server.asduHandlerParameter, this, asdu))
{
messageHandled = true;
}
}
if (messageHandled == false)
{
asdu.Cot = CauseOfTransmission.UNKNOWN_TYPE_ID;
this.SendASDUInternal(asdu);
}
}
/// <summary>
/// 处理消息
/// </summary>
/// <param name="socket"></param>
/// <param name="buffer"></param>
/// <param name="msgSize"></param>
/// <returns></returns>
private bool HandleMessage(Socket socket, byte[] buffer, int msgSize)
{
if ((buffer[2] & 1) == 0)
{
if (debugOutput)
{
Console.WriteLine("Received I frame");
}
if (msgSize < 7)
{
if (debugOutput)
{
Console.WriteLine("I msg too small!");
}
return(false);
}
IncreaseReceivedMessageCounters();
if (isActive)
{
bool messageHandled = false;
ASDU asdu = new ASDU(parameters, buffer, msgSize);
//根据类型来分别处理
switch (asdu.TypeId)
{
case TypeID.C_IC_NA_1: /* 100 - interrogation command 总召*/
if (debugOutput)
{
Console.WriteLine("Rcvd interrogation command C_IC_NA_1");
}
if ((asdu.Cot == CauseOfTransmission.ACTIVATION) || (asdu.Cot == CauseOfTransmission.DEACTIVATION))
{
if (server.interrogationHandler != null)
{
InterrogationCommand irc = (InterrogationCommand)asdu.GetElement(0);
if (server.interrogationHandler(server.InterrogationHandlerParameter, this, asdu, irc.QOI))
{
messageHandled = true;
}
}
}
else
{
asdu.Cot = CauseOfTransmission.UNKNOWN_CAUSE_OF_TRANSMISSION;
this.SendASDU(asdu);
}
break;
case TypeID.C_CI_NA_1: /* 101 - counter interrogation command 累计量总召*/
if (debugOutput)
{
Console.WriteLine("Rcvd counter interrogation command C_CI_NA_1");
}
if ((asdu.Cot == CauseOfTransmission.ACTIVATION) || (asdu.Cot == CauseOfTransmission.DEACTIVATION))
{
if (server.counterInterrogationHandler != null)
{
CounterInterrogationCommand cic = (CounterInterrogationCommand)asdu.GetElement(0);
if (server.counterInterrogationHandler(server.counterInterrogationHandlerParameter, this, asdu, cic.QCC))
{
messageHandled = true;
}
}
}
else
{
asdu.Cot = CauseOfTransmission.UNKNOWN_CAUSE_OF_TRANSMISSION;
this.SendASDU(asdu);
}
break;
case TypeID.C_RD_NA_1: /* 102 - read command 读命令*/
if (debugOutput)
{
Console.WriteLine("Rcvd read command C_RD_NA_1");
}
if (asdu.Cot == CauseOfTransmission.REQUEST)
{
if (debugOutput)
{
Console.WriteLine("Read request for object: " + asdu.Ca);
}
if (server.readHandler != null)
{
ReadCommand rc = (ReadCommand)asdu.GetElement(0);
if (server.readHandler(server.readHandlerParameter, this, asdu, rc.ObjectAddress))
{
messageHandled = true;
}
}
}
else
{
asdu.Cot = CauseOfTransmission.UNKNOWN_CAUSE_OF_TRANSMISSION;
this.SendASDU(asdu);
}
break;
case TypeID.C_CS_NA_1: /* 103 - Clock synchronization command 时钟同步 */
if (debugOutput)
{
Console.WriteLine("Rcvd clock sync command C_CS_NA_1");
}
if (asdu.Cot == CauseOfTransmission.ACTIVATION)
{
if (server.clockSynchronizationHandler != null)
{
ClockSynchronizationCommand csc = (ClockSynchronizationCommand)asdu.GetElement(0);
if (server.clockSynchronizationHandler(server.clockSynchronizationHandlerParameter,
this, asdu, csc.NewTime))
{
messageHandled = true;
}
}
}
else
{
asdu.Cot = CauseOfTransmission.UNKNOWN_CAUSE_OF_TRANSMISSION;
this.SendASDU(asdu);
}
break;
case TypeID.C_TS_NA_1: /* 104 - test command */
if (debugOutput)
{
Console.WriteLine("Rcvd test command C_TS_NA_1");
}
//直接处理
if (asdu.Cot != CauseOfTransmission.ACTIVATION)
{
asdu.Cot = CauseOfTransmission.UNKNOWN_CAUSE_OF_TRANSMISSION;
}
else
{
asdu.Cot = CauseOfTransmission.ACTIVATION_CON;
}
this.SendASDU(asdu);
messageHandled = true;
break;
case TypeID.C_RP_NA_1: /* 105 - Reset process command 复位命令*/
if (debugOutput)
{
Console.WriteLine("Rcvd reset process command C_RP_NA_1");
}
if (asdu.Cot == CauseOfTransmission.ACTIVATION)
{
if (server.resetProcessHandler != null)
{
ResetProcessCommand rpc = (ResetProcessCommand)asdu.GetElement(0);
if (server.resetProcessHandler(server.resetProcessHandlerParameter,
this, asdu, rpc.QRP))
{
messageHandled = true;
}
}
}
else
{
asdu.Cot = CauseOfTransmission.UNKNOWN_CAUSE_OF_TRANSMISSION;
this.SendASDU(asdu);
}
break;
case TypeID.C_CD_NA_1: /* 106 - Delay acquisition command 延时获得*/
if (debugOutput)
{
Console.WriteLine("Rcvd delay acquisition command C_CD_NA_1");
}
if ((asdu.Cot == CauseOfTransmission.ACTIVATION) || (asdu.Cot == CauseOfTransmission.SPONTANEOUS))
{
if (server.delayAcquisitionHandler != null)
{
DelayAcquisitionCommand dac = (DelayAcquisitionCommand)asdu.GetElement(0);
if (server.delayAcquisitionHandler(server.delayAcquisitionHandlerParameter,
this, asdu, dac.Delay))
{
messageHandled = true;
}
}
}
else
{
asdu.Cot = CauseOfTransmission.UNKNOWN_CAUSE_OF_TRANSMISSION;
this.SendASDU(asdu);
}
break;
}
//都没处理，就直接当通用ASDU处理掉了
if ((messageHandled == false) && (server.asduHandler != null))
{
if (server.asduHandler(server.asduHandlerParameter, this, asdu))
{
messageHandled = true;
}
}
//依旧没处理，那就返回未知
if (messageHandled == false)
{
asdu.Cot = CauseOfTransmission.UNKNOWN_TYPE_ID;
this.SendASDU(asdu);
}
}
else
{
// connection not activated --> skip message
if (debugOutput)
{
Console.WriteLine("Message not activated. Skip I message");
}
}
return(true);
}
// Check for TESTFR_ACT message
else if ((buffer[2] & 0x43) == 0x43)
{
if (debugOutput)
{
Console.WriteLine("Send TESTFR_CON");
}
socket.Send(TESTFR_CON_MSG);
}
// Check for STARTDT_ACT message
else if ((buffer[2] & 0x07) == 0x07)
{
if (debugOutput)
{
Console.WriteLine("Send STARTDT_CON");
}
this.isActive = true;
socket.Send(STARTDT_CON_MSG);
}
// Check for STOPDT_ACT message
else if ((buffer[2] & 0x13) == 0x13)
{
if (debugOutput)
{
Console.WriteLine("Send STOPDT_CON");
}
this.isActive = false;
socket.Send(STOPDT_CON_MSG);
}
// S-message S帧（用于确认对方的接收序号）
else if (buffer[2] == 0x01)
{
int messageCount = (buffer[4] + buffer[5] * 0x100) / 2;
Console.WriteLine("Recv S(" + messageCount + ") (own sendcounter = " + sendCount + ")");
}
else
{
Console.WriteLine("Unknown message");
return(true);
}
return(true);
}
private bool HandleMessage(byte[] buffer, int msgSize)
{
long currentTime = SystemUtils.currentTimeMillis();
if ((buffer [2] & 1) == 0)
{
if (msgSize < 7)
{
DebugLog("I msg too small!");
return(false);
}
if (firstIMessageReceived == false)
{
firstIMessageReceived = true;
lastConfirmationTime = currentTime; /* start timeout T2 */
}
int frameSendSequenceNumber = ((buffer [3] * 0x100) + (buffer [2] & 0xfe)) / 2;
int frameRecvSequenceNumber = ((buffer [5] * 0x100) + (buffer [4] & 0xfe)) / 2;
DebugLog("Received I frame: N(S) = " + frameSendSequenceNumber + " N(R) = " + frameRecvSequenceNumber);
/* check the receive sequence number N(R) - connection will be closed on an unexpected value */
if (frameSendSequenceNumber != receiveCount)
{
DebugLog("Sequence error: Close connection!");
return(false);
}
if (CheckSequenceNumber(frameRecvSequenceNumber) == false)
{
DebugLog("Sequence number check failed");
return(false);
}
receiveCount = (receiveCount + 1) % 32768;
unconfirmedReceivedIMessages++;
if (isActive)
{
try {
ASDU asdu = new ASDU(parameters, buffer, 6, msgSize);
// push to handler thread for processing
DebugLog("Enqueue received I-message for processing");
receivedASDUs.Enqueue(asdu);
}
catch (ASDUParsingException e) {
DebugLog("ASDU parsing failed: " + e.Message);
return(false);
}
}
else
{
// connection not activated --> skip message
DebugLog("Connection not activated. Skip I message");
}
}
// Check for TESTFR_ACT message
else if ((buffer [2] & 0x43) == 0x43)
{
DebugLog("Send TESTFR_CON");
socketStream.Write(TESTFR_CON_MSG, 0, TESTFR_CON_MSG.Length);
}
// Check for STARTDT_ACT message
else if ((buffer [2] & 0x07) == 0x07)
{
DebugLog("Send STARTDT_CON");
this.isActive = true;
this.server.Activated(this);
socketStream.Write(STARTDT_CON_MSG, 0, TESTFR_CON_MSG.Length);
}
// Check for STOPDT_ACT message
else if ((buffer [2] & 0x13) == 0x13)
{
DebugLog("Send STOPDT_CON");
this.isActive = false;
socketStream.Write(STOPDT_CON_MSG, 0, TESTFR_CON_MSG.Length);
}
// Check for TESTFR_CON message
else if ((buffer [2] & 0x83) == 0x83)
{
DebugLog("Recv TESTFR_CON");
outStandingTestFRConMessages = 0;
}
// S-message
else if (buffer [2] == 0x01)
{
int seqNo = (buffer[4] + buffer[5] * 0x100) / 2;
DebugLog("Recv S(" + seqNo + ") (own sendcounter = " + sendCount + ")");
if (CheckSequenceNumber(seqNo) == false)
{
return(false);
}
}
else
{
DebugLog("Unknown message");
}
ResetT3Timeout();
return(true);
}
/// <summary>
/// 信息检查，按说每收到一条信息都要来这里检查。。。
/// </summary>
/// <param name="socket"></param>
/// <param name="buffer"></param>
/// <param name="msgSize"></param>
/// <returns></returns>
private bool checkMessage(Socket socket, byte[] buffer, int msgSize)
{
//这里检测I帧和U帧，不知道为什么不检测S帧，难道是S帧已经处理过了？
//update：似乎他这里只需要发送S帧，不主动监测S帧。。。
if ((buffer[2] & 1) == 0)
{ /* I format frame */
if (debugOutput)
{
Console.WriteLine("Received I frame");
}
if (msgSize < 7)
{
if (debugOutput)
{
Console.WriteLine("I msg too small!");
}
return(false);
}
receiveCount++;
unconfirmedMessages++;
long currentTime = SystemUtils.currentTimeMillis();
if ((unconfirmedMessages > parameters.W) || checkConfirmTimeout(currentTime))
{
//未确认消息超过W，或者t2超时，则发送S帧
lastConfirmationTime = currentTime;
unconfirmedMessages = 0;
sendSMessage();
}
//新建一个ASDU，准备解析
ASDU asdu = new ASDU(parameters, buffer, msgSize);
//解析ASDU
if (asduReceivedHandler != null)
{
asduReceivedHandler(asduReceivedHandlerParameter, asdu);
}
}
else if ((buffer[2] & 0x03) == 0x03)
{ /* U format frame */
if (buffer[2] == 0x43)
{ // Check for TESTFR_ACT message
//收到了测试命令，回复测试确认
socket.Send(TESTFR_CON_MSG);
}
else if (buffer[2] == 0x07)
{ /* STARTDT ACT */
//收到了开启命令，回复开启命令确认
socket.Send(STARTDT_CON_MSG);
}
else if (buffer[2] == 0x0b)
{ /* STARTDT_CON */
//收到了开启确认，处理[已连接]事件
if (connectionHandler != null)
{
connectionHandler(connectionHandlerParameter, ConnectionEvent.STARTDT_CON_RECEIVED);
}
}
else if (buffer[2] == 0x23)
{ /* STOPDT_CON */
//收到了停止确认，处理[已断开]事件
if (connectionHandler != null)
{
connectionHandler(connectionHandlerParameter, ConnectionEvent.STOPDT_CON_RECEIVED);
}
}
}
return(true);
}