void IMasterConnection.SendACT_TERM(ASDU asdu)
{
asdu.Cot = CauseOfTransmission.ACTIVATION_TERMINATION;
asdu.IsNegative = false;
SendASDU(asdu);
}
void IMasterConnection.SendACT_CON(ASDU asdu, bool negative)
{
asdu.Cot = CauseOfTransmission.ACTIVATION_CON;
asdu.IsNegative = negative;
SendASDU(asdu);
}
void IPrimaryLinkLayerCallbacks.UserData(int slaveAddress, byte[] message, int start, int length)
{
DebugLog("User data slave " + slaveAddress);
ASDU asdu;
try
{
asdu = new ASDU(appLayerParameters, message, start, start + length);
}
catch (ASDUParsingException e)
{
DebugLog("ASDU parsing failed: " + e.Message);
return;
}
bool messageHandled = false;
if (fileClient != null)
{
messageHandled = fileClient.HandleFileAsdu(asdu);
}
if (messageHandled == false)
{
if (asduReceivedHandler != null)
{
asduReceivedHandler(asduReceivedHandlerParameter, slaveAddress, asdu);
}
}
}
/// <summary>
/// Callback function for secondary link layer (balanced mode)
/// </summary>
private bool HandleApplicationLayer(int address, byte[] msg, int userDataStart, int userDataLength)
{
ASDU asdu;
try
{
asdu = new ASDU(appLayerParameters, buffer, userDataStart, userDataStart + userDataLength);
}
catch (ASDUParsingException e)
{
DebugLog("ASDU parsing failed: " + e.Message);
return(false);
}
bool messageHandled = false;
if (fileClient != null)
{
messageHandled = fileClient.HandleFileAsdu(asdu);
}
if (messageHandled == false)
{
if (asduReceivedHandler != null)
{
messageHandled = asduReceivedHandler(asduReceivedHandlerParameter, address, asdu);
}
}
return(messageHandled);
}
public override void SendDelayAcquisitionCommand(CauseOfTransmission cot, int ca, CP16Time2a delay)
{
ASDU asdu = new ASDU(appLayerParameters, CauseOfTransmission.ACTIVATION, false, false, (byte)appLayerParameters.OA, ca, false);
asdu.AddInformationObject(new DelayAcquisitionCommand(0, delay));
EnqueueUserData(asdu);
}
public override void SendControlCommand(CauseOfTransmission cot, int ca, InformationObject sc)
{
ASDU controlCommand = new ASDU(appLayerParameters, cot, false, false, (byte)appLayerParameters.OA, ca, false);
controlCommand.AddInformationObject(sc);
EnqueueUserData(controlCommand);
}
public override void SendTestCommand(int ca)
{
ASDU asdu = new ASDU(parameters, CauseOfTransmission.ACTIVATION, false, false, (byte)parameters.OA, ca, false);
asdu.AddInformationObject(new TestCommand());
EnqueueUserData(asdu);
}
public override void SendReadCommand(int ca, int ioa)
{
ASDU asdu = new ASDU(appLayerParameters, CauseOfTransmission.REQUEST, false, false, (byte)appLayerParameters.OA, ca, false);
asdu.AddInformationObject(new ReadCommand(ioa));
EnqueueUserData(asdu);
}
public override void SendCounterInterrogationCommand(CauseOfTransmission cot, int ca, byte qcc)
{
ASDU asdu = new ASDU(appLayerParameters, cot, false, false, (byte)appLayerParameters.OA, ca, false);
asdu.AddInformationObject(new CounterInterrogationCommand(0, qcc));
EnqueueUserData(asdu);
}
public override void SendClockSyncCommand(int ca, CP56Time2a time)
{
ASDU asdu = new ASDU(appLayerParameters, CauseOfTransmission.ACTIVATION, false, false, (byte)appLayerParameters.OA, ca, false);
asdu.AddInformationObject(new ClockSynchronizationCommand(0, time));
EnqueueUserData(asdu);
}
private ASDU NewAsdu(InformationObject io)
{
ASDU asdu = new ASDU(master.GetApplicationLayerParameters(), CauseOfTransmission.FILE_TRANSFER, false, false, 0, ca, false);
asdu.AddInformationObject(io);
return(asdu);
}
public override void SendTestCommandWithCP56Time2a(int ca, ushort tsc, CP56Time2a time)
{
ASDU asdu = new ASDU(appLayerParameters, CauseOfTransmission.ACTIVATION, false, false, (byte)appLayerParameters.OA, ca, false);
asdu.AddInformationObject(new TestCommandWithCP56Time2a(tsc, time));
EnqueueUserData(asdu);
}
public override void SendResetProcessCommand(CauseOfTransmission cot, int ca, byte qrp)
{
ASDU asdu = new ASDU(appLayerParameters, CauseOfTransmission.ACTIVATION, false, false, (byte)appLayerParameters.OA, ca, false);
asdu.AddInformationObject(new ResetProcessCommand(0, qrp));
EnqueueUserData(asdu);
}
public override void SendInterrogationCommand(CauseOfTransmission cot, int ca, byte qoi)
{
ASDU asdu = new ASDU(parameters, cot, false, false, (byte)parameters.OA, ca, false);
asdu.AddInformationObject(new InterrogationCommand(0, qoi));
EnqueueUserData(asdu);
}
private void EnqueueUserData(ASDU asdu)
{
//TODO problem -> buffer frame needs own buffer so that the message can be stored.
BufferFrame bf = new BufferFrame(buffer, 0);
asdu.Encode(bf, parameters);
linkLayerUnbalanced.SendConfirmed(slaveAddress, bf);
}
private void EnqueueUserData(ASDU asdu)
{
lock (userDataQueue) {
BufferFrame frame = new BufferFrame(new byte[256], 0);
asdu.Encode(frame, parameters);
userDataQueue.Enqueue(frame);
}
}
private void AbortFileTransfer(FileErrorCode errorCode)
{
ASDU deactivateFile = NewAsdu(new FileCallOrSelect(ioa, nof, 0, SelectAndCallQualifier.DEACTIVATE_FILE));
master.SendASDU(deactivateFile);
if (fileReceiver != null)
{
fileReceiver.Finished(errorCode);
}
ResetStateToIdle();
}
public void RequestFile(int ca, int ioa, NameOfFile nof, IFileReceiver fileReceiver)
{
this.ca = ca;
this.ioa = ioa;
this.nof = nof;
this.fileReceiver = fileReceiver;
ASDU selectFile = NewAsdu(new FileCallOrSelect(ioa, nof, 0, SelectAndCallQualifier.SELECT_FILE));
master.SendASDU(selectFile);
state = FileClientState.WAITING_FOR_FILE_READY;
}
public void EnqueueUserDataClass2(ASDU asdu)
{
lock (userDataClass2Queue) {
BufferFrame frame = new BufferFrame(new byte[256], 0);
asdu.Encode(frame, parameters);
userDataClass2Queue.Enqueue(frame);
while (userDataClass2Queue.Count > userDataClass2QueueMaxSize)
{
userDataClass2Queue.Dequeue();
}
}
}
private void EnqueueUserData(ASDU asdu)
{
if (linkLayerUnbalanced != null)
{
//TODO problem -> buffer frame needs own buffer so that the message can be stored.
BufferFrame frame = new BufferFrame(buffer, 0);
asdu.Encode(frame, appLayerParameters);
linkLayerUnbalanced.SendConfirmed(slaveAddress, frame);
}
else
{
lock (userDataQueue) {
BufferFrame frame = new BufferFrame(new byte[256], 0);
asdu.Encode(frame, appLayerParameters);
userDataQueue.Enqueue(frame);
}
}
}
public override void SendASDU(ASDU asdu)
{
EnqueueUserData(asdu);
}
private bool HandleApplicationLayer(byte[] msg, int userDataStart, int userDataLength)
{
ASDU asdu;
try {
asdu = new ASDU(parameters, buffer, userDataStart, userDataStart + userDataLength);
}
catch (ASDUParsingException e) {
DebugLog("ASDU parsing failed: " + e.Message);
return(false);
}
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 (this.interrogationHandler != null)
{
InterrogationCommand irc = (InterrogationCommand)asdu.GetElement(0);
if (this.interrogationHandler(this.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 */
DebugLog("Rcvd counter interrogation command C_CI_NA_1");
if ((asdu.Cot == CauseOfTransmission.ACTIVATION) || (asdu.Cot == CauseOfTransmission.DEACTIVATION))
{
if (this.counterInterrogationHandler != null)
{
CounterInterrogationCommand cic = (CounterInterrogationCommand)asdu.GetElement(0);
if (this.counterInterrogationHandler(this.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 */
DebugLog("Rcvd read command C_RD_NA_1");
if (asdu.Cot == CauseOfTransmission.REQUEST)
{
DebugLog("Read request for object: " + asdu.Ca);
if (this.readHandler != null)
{
ReadCommand rc = (ReadCommand)asdu.GetElement(0);
if (this.readHandler(this.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 */
DebugLog("Rcvd clock sync command C_CS_NA_1");
if (asdu.Cot == CauseOfTransmission.ACTIVATION)
{
if (this.clockSynchronizationHandler != null)
{
ClockSynchronizationCommand csc = (ClockSynchronizationCommand)asdu.GetElement(0);
if (this.clockSynchronizationHandler(this.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 */
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.SendASDU(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 (this.resetProcessHandler != null)
{
ResetProcessCommand rpc = (ResetProcessCommand)asdu.GetElement(0);
if (this.resetProcessHandler(this.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 */
DebugLog("Rcvd delay acquisition command C_CD_NA_1");
if ((asdu.Cot == CauseOfTransmission.ACTIVATION) || (asdu.Cot == CauseOfTransmission.SPONTANEOUS))
{
if (this.delayAcquisitionHandler != null)
{
DelayAcquisitionCommand dac = (DelayAcquisitionCommand)asdu.GetElement(0);
if (this.delayAcquisitionHandler(this.delayAcquisitionHandlerParameter,
this, asdu, dac.Delay))
{
messageHandled = true;
}
}
}
else
{
asdu.Cot = CauseOfTransmission.UNKNOWN_CAUSE_OF_TRANSMISSION;
this.SendASDU(asdu);
}
break;
}
if (messageHandled == false)
{
messageHandled = fileServer.HandleFileAsdu(asdu);
}
if ((messageHandled == false) && (this.asduHandler != null))
{
if (this.asduHandler(this.asduHandlerParameter, this, asdu))
{
messageHandled = true;
}
}
if (messageHandled == false)
{
asdu.Cot = CauseOfTransmission.UNKNOWN_TYPE_ID;
this.SendASDU(asdu);
}
return(true);
}
/********************************************
* IASDUSender
********************************************/
void IMasterConnection.SendASDU(ASDU asdu)
{
SendASDU(asdu);
}
/// <summary> /// Sends an arbitrary ASDU to the connected slave /// </summary> /// <param name="asdu">The ASDU to send</param> public abstract void SendASDU(ASDU asdu);
public void HandleFileTransmission()
{
if (transferState != FileServerState.UNSELECTED_IDLE)
{
if (transferState == FileServerState.TRANSMIT_SECTION)
{
if (selectedFile != null)
{
IFileProvider file = selectedFile.provider;
ASDU fileAsdu = new ASDU(alParameters, CauseOfTransmission.FILE_TRANSFER, false, false, 0, file.GetCA(), false);
if (currentSectionOffset == currentSectionSize)
{
// send last segment
fileAsdu.AddInformationObject(
new FileLastSegmentOrSection(file.GetIOA(), file.GetNameOfFile(),
currentSectionNumber,
LastSectionOrSegmentQualifier.SECTION_TRANSFER_WITHOUT_DEACT,
sectionChecksum));
fileChecksum += sectionChecksum;
sectionChecksum = 0;
logger("Send LAST SEGMENT");
connection.SendASDU(fileAsdu);
transferState = FileServerState.WAITING_FOR_SECTION_ACK;
}
else
{
int currentSegmentSize = currentSectionSize - currentSectionOffset;
if (currentSegmentSize > maxSegmentSize)
{
currentSegmentSize = maxSegmentSize;
}
byte[] segmentData = new byte[currentSegmentSize];
file.GetSegmentData(currentSectionNumber,
currentSectionOffset,
currentSegmentSize,
segmentData);
fileAsdu.AddInformationObject(
new FileSegment(file.GetIOA(), file.GetNameOfFile(), currentSectionNumber,
segmentData));
byte checksum = 0;
foreach (byte octet in segmentData)
{
checksum += octet;
}
connection.SendASDU(fileAsdu);
sectionChecksum += checksum;
logger("Send SEGMENT (CHS=" + sectionChecksum + ")");
currentSectionOffset += currentSegmentSize;
}
}
}
}
}
internal void SendASDU(ASDU asdu)
{
EnqueueUserDataClass1(asdu);
}
public bool HandleFileAsdu(ASDU asdu)
{
bool asduHandled = true;
switch (asdu.TypeId)
{
case TypeID.F_SC_NA_1: /* File/Section/Directory Call/Select */
DebugLog("Received SELECT/CALL");
if (state == FileClientState.WAITING_FOR_FILE_READY)
{
if (asdu.Cot == CauseOfTransmission.UNKNOWN_TYPE_ID)
{
if (fileReceiver != null)
{
fileReceiver.Finished(FileErrorCode.UNKNOWN_SERVICE);
}
}
else if (asdu.Cot == CauseOfTransmission.UNKNOWN_COMMON_ADDRESS_OF_ASDU)
{
if (fileReceiver != null)
{
fileReceiver.Finished(FileErrorCode.UNKNOWN_CA);
}
}
else if (asdu.Cot == CauseOfTransmission.UNKNOWN_INFORMATION_OBJECT_ADDRESS)
{
if (fileReceiver != null)
{
fileReceiver.Finished(FileErrorCode.UNKNOWN_IOA);
}
}
else
{
if (fileReceiver != null)
{
fileReceiver.Finished(FileErrorCode.PROTOCOL_ERROR);
}
}
}
else
{
if (fileReceiver != null)
{
fileReceiver.Finished(FileErrorCode.PROTOCOL_ERROR);
}
}
ResetStateToIdle();
break;
case TypeID.F_FR_NA_1: /* File ready */
DebugLog("Received FILE READY");
if (state == FileClientState.WAITING_FOR_FILE_READY)
{
//TODO check ca, ioa, nof
FileReady fileReady = (FileReady)asdu.GetElement(0);
if (fileReady.Positive)
{
ASDU callFile = NewAsdu(new FileCallOrSelect(ioa, nof, 0, SelectAndCallQualifier.REQUEST_FILE));
master.SendASDU(callFile);
DebugLog("Send CALL FILE");
state = FileClientState.WAITING_FOR_SECTION_READY;
}
else
{
if (fileReceiver != null)
{
fileReceiver.Finished(FileErrorCode.FILE_NOT_READY);
}
ResetStateToIdle();
}
}
else if (state == FileClientState.IDLE)
{
//TODO call user callback to
//TODO send positive or negative ACK
state = FileClientState.WAITING_FOR_SECTION_READY;
}
else
{
AbortFileTransfer(FileErrorCode.PROTOCOL_ERROR);
}
break;
case TypeID.F_SR_NA_1: /* Section ready */
DebugLog("Received SECTION READY");
if (state == FileClientState.WAITING_FOR_SECTION_READY)
{
SectionReady sc = (SectionReady)asdu.GetElement(0);
if (sc.NotReady == false)
{
ASDU callSection = NewAsdu(new FileCallOrSelect(ioa, nof, 0, SelectAndCallQualifier.REQUEST_SECTION));
master.SendASDU(callSection);
DebugLog("Send CALL SECTION");
segmentOffset = 0;
state = FileClientState.RECEIVING_SECTION;
}
else
{
AbortFileTransfer(FileErrorCode.SECTION_NOT_READY);
}
}
else if (state == FileClientState.IDLE)
{
}
else
{
if (fileReceiver != null)
{
fileReceiver.Finished(FileErrorCode.PROTOCOL_ERROR);
}
ResetStateToIdle();
}
break;
case TypeID.F_SG_NA_1: /* Segment */
DebugLog("Received SEGMENT");
if (state == FileClientState.RECEIVING_SECTION)
{
FileSegment segment = (FileSegment)asdu.GetElement(0);
if (fileReceiver != null)
{
fileReceiver.SegmentReceived(segment.NameOfSection, segmentOffset, segment.LengthOfSegment, segment.SegmentData);
}
segmentOffset += segment.LengthOfSegment;
}
else if (state == FileClientState.IDLE)
{
}
else
{
AbortFileTransfer(FileErrorCode.PROTOCOL_ERROR);
}
break;
case TypeID.F_LS_NA_1: /* Last segment or section */
DebugLog("Received LAST SEGMENT/SECTION");
if (state != FileClientState.IDLE)
{
FileLastSegmentOrSection lastSection = (FileLastSegmentOrSection)asdu.GetElement(0);
if (lastSection.LSQ == LastSectionOrSegmentQualifier.SECTION_TRANSFER_WITHOUT_DEACT)
{
if (state == FileClientState.RECEIVING_SECTION)
{
ASDU segmentAck = NewAsdu(new FileACK(ioa, nof, lastSection.NameOfSection, AcknowledgeQualifier.POS_ACK_SECTION, FileError.DEFAULT));
master.SendASDU(segmentAck);
DebugLog("Send SEGMENT ACK");
state = FileClientState.WAITING_FOR_SECTION_READY;
}
else
{
AbortFileTransfer(FileErrorCode.PROTOCOL_ERROR);
}
}
else if (lastSection.LSQ == LastSectionOrSegmentQualifier.FILE_TRANSFER_WITH_DEACT)
{
/* slave aborted transfer */
if (fileReceiver != null)
{
fileReceiver.Finished(FileErrorCode.ABORTED_BY_REMOTE);
}
ResetStateToIdle();
}
else if (lastSection.LSQ == LastSectionOrSegmentQualifier.FILE_TRANSFER_WITHOUT_DEACT)
{
if (state == FileClientState.WAITING_FOR_SECTION_READY)
{
ASDU fileAck = NewAsdu(new FileACK(ioa, nof, lastSection.NameOfSection, AcknowledgeQualifier.POS_ACK_FILE, FileError.DEFAULT));
master.SendASDU(fileAck);
DebugLog("Send FILE ACK");
if (fileReceiver != null)
{
fileReceiver.Finished(FileErrorCode.SUCCESS);
}
ResetStateToIdle();
}
else
{
DebugLog("Illegal state: " + state.ToString());
AbortFileTransfer(FileErrorCode.PROTOCOL_ERROR);
}
}
}
break;
default:
asduHandled = false;
break;
}
return(asduHandled);
}
internal void SendDirectoy(IMasterConnection masterConnection, bool spontaneous)
{
CauseOfTransmission cot;
if (spontaneous)
{
cot = CauseOfTransmission.SPONTANEOUS;
}
else
{
cot = CauseOfTransmission.REQUEST;
}
lock (availableFiles) {
int size = availableFiles.Count;
int i = 0;
int currentCa = -1;
int currentIOA = -1;
ASDU directoryAsdu = null;
foreach (CS101n104File file in availableFiles)
{
bool newAsdu = false;
if (file.provider.GetCA() != currentCa)
{
currentCa = file.provider.GetCA();
newAsdu = true;
}
if (currentIOA != (file.provider.GetIOA() - 1))
{
newAsdu = true;
}
if (newAsdu)
{
if (directoryAsdu != null)
{
masterConnection.SendASDU(directoryAsdu);
directoryAsdu = null;
}
}
currentIOA = file.provider.GetIOA();
i++;
if (directoryAsdu == null)
{
directoryAsdu = new ASDU(masterConnection.GetApplicationLayerParameters(), cot, false, false, 0, currentCa, true);
}
bool lastFile = (i == size);
byte sof = 0;
if (lastFile)
{
sof = 0x20;
}
InformationObject io = new FileDirectory(currentIOA, file.provider.GetNameOfFile(), file.provider.GetFileSize(), sof, new CP56Time2a(file.provider.GetFileDate()));
if (!directoryAsdu.AddInformationObject(io) == false)
{
masterConnection.SendASDU(directoryAsdu);
directoryAsdu = new ASDU(masterConnection.GetApplicationLayerParameters(), cot, false, false, 0, currentCa, true);
directoryAsdu.AddInformationObject(io);
}
}
if (directoryAsdu != null)
{
masterConnection.SendASDU(directoryAsdu);
}
}
}
public bool HandleFileAsdu(ASDU asdu)
{
bool handled = true;
switch (asdu.TypeId)
{
case TypeID.F_AF_NA_1: /* 124 - ACK file, ACK section */
logger("Received file/section ACK F_AF_NA_1");
if (asdu.Cot == CauseOfTransmission.FILE_TRANSFER)
{
if (transferState != FileServerState.UNSELECTED_IDLE)
{
IFileProvider file = selectedFile.provider;
FileACK ack = (FileACK)asdu.GetElement(0);
if (ack.AckQualifier == AcknowledgeQualifier.POS_ACK_FILE)
{
logger("Received positive file ACK");
if (transferState == FileServerState.WAITING_FOR_FILE_ACK)
{
selectedFile.provider.TransferComplete(true);
availableFiles.RemoveFile(selectedFile.provider);
selectedFile = null;
transferState = FileServerState.UNSELECTED_IDLE;
}
else
{
logger("Unexpected file transfer state --> abort file transfer");
transferState = FileServerState.SEND_ABORT;
}
}
else if (ack.AckQualifier == AcknowledgeQualifier.NEG_ACK_FILE)
{
logger("Received negative file ACK - stop transfer");
if (transferState == FileServerState.WAITING_FOR_FILE_ACK)
{
selectedFile.provider.TransferComplete(false);
selectedFile.selectedBy = null;
selectedFile = null;
transferState = FileServerState.UNSELECTED_IDLE;
}
else
{
logger("Unexpected file transfer state --> abort file transfer");
transferState = FileServerState.SEND_ABORT;
}
}
else if (ack.AckQualifier == AcknowledgeQualifier.NEG_ACK_SECTION)
{
logger("Received negative file section ACK - repeat section");
if (transferState == FileServerState.WAITING_FOR_SECTION_ACK)
{
currentSectionOffset = 0;
sectionChecksum = 0;
ASDU sectionReady = new ASDU(alParameters, CauseOfTransmission.FILE_TRANSFER, false, false, 0, file.GetCA(), false);
sectionReady.AddInformationObject(
new SectionReady(selectedFile.provider.GetIOA(), selectedFile.provider.GetNameOfFile(), currentSectionNumber, currentSectionSize, false));
connection.SendASDU(sectionReady);
transferState = FileServerState.TRANSMIT_SECTION;
}
else
{
logger("Unexpected file transfer state --> abort file transfer");
transferState = FileServerState.SEND_ABORT;
}
}
else if (ack.AckQualifier == AcknowledgeQualifier.POS_ACK_SECTION)
{
if (transferState == FileServerState.WAITING_FOR_SECTION_ACK)
{
currentSectionNumber++;
int nextSectionSize =
selectedFile.provider.GetSectionSize(currentSectionNumber);
ASDU responseAsdu = new ASDU(alParameters, CauseOfTransmission.FILE_TRANSFER, false, false, 0, file.GetCA(), false);
if (nextSectionSize == -1)
{
logger("Reveived positive file section ACK - send last section indication");
responseAsdu.AddInformationObject(
new FileLastSegmentOrSection(file.GetIOA(), file.GetNameOfFile(),
(byte)currentSectionNumber,
LastSectionOrSegmentQualifier.FILE_TRANSFER_WITHOUT_DEACT,
fileChecksum));
transferState = FileServerState.WAITING_FOR_FILE_ACK;
}
else
{
logger("Reveived positive file section ACK - send next section ready indication");
currentSectionSize = nextSectionSize;
responseAsdu.AddInformationObject(
new SectionReady(selectedFile.provider.GetIOA(), selectedFile.provider.GetNameOfFile(), currentSectionNumber, currentSectionSize, false));
transferState = FileServerState.WAITING_FOR_SECTION_CALL;
}
connection.SendASDU(responseAsdu);
sectionChecksum = 0;
}
else
{
logger("Unexpected file transfer state --> abort file transfer");
transferState = FileServerState.SEND_ABORT;
}
}
}
else
{
// No file transmission in progress --> what to do?
logger("Unexpected File ACK message -> ignore");
}
}
else
{
asdu.Cot = CauseOfTransmission.UNKNOWN_CAUSE_OF_TRANSMISSION;
connection.SendASDU(asdu);
}
break;
case TypeID.F_SC_NA_1: /* 122 - Call/Select directoy/file/section */
logger("Received call/select F_SC_NA_1");
if (asdu.Cot == CauseOfTransmission.FILE_TRANSFER)
{
FileCallOrSelect sc = (FileCallOrSelect)asdu.GetElement(0);
if (sc.SCQ == SelectAndCallQualifier.SELECT_FILE)
{
if (transferState == FileServerState.UNSELECTED_IDLE)
{
logger("Received SELECT FILE");
CS101n104File file = availableFiles.GetFile(asdu.Ca, sc.ObjectAddress, sc.NOF);
if (file == null)
{
asdu.Cot = CauseOfTransmission.UNKNOWN_INFORMATION_OBJECT_ADDRESS;
connection.SendASDU(asdu);
}
else
{
ASDU fileReady = new ASDU(alParameters, CauseOfTransmission.FILE_TRANSFER, false, false, 0, asdu.Ca, false);
// check if already selected
if (file.selectedBy == null)
{
file.selectedBy = this;
fileReady.AddInformationObject(new FileReady(sc.ObjectAddress, sc.NOF, file.provider.GetFileSize(), true));
}
else
{
fileReady.AddInformationObject(new FileReady(sc.ObjectAddress, sc.NOF, 0, false));
}
connection.SendASDU(fileReady);
selectedFile = file;
transferState = FileServerState.WAITING_FOR_FILE_CALL;
}
}
else
{
logger("Unexpected SELECT FILE message");
}
}
else if (sc.SCQ == SelectAndCallQualifier.DEACTIVATE_FILE)
{
logger("Received DEACTIVATE FILE");
if (transferState != FileServerState.UNSELECTED_IDLE)
{
if (selectedFile != null)
{
selectedFile.selectedBy = null;
selectedFile = null;
}
transferState = FileServerState.UNSELECTED_IDLE;
}
else
{
logger("Unexpected DEACTIVATE FILE message");
}
}
else if (sc.SCQ == SelectAndCallQualifier.REQUEST_FILE)
{
logger("Received CALL FILE");
if (transferState == FileServerState.WAITING_FOR_FILE_CALL)
{
if (selectedFile.provider.GetIOA() != sc.ObjectAddress)
{
logger("Unkown IOA");
asdu.Cot = CauseOfTransmission.UNKNOWN_INFORMATION_OBJECT_ADDRESS;
connection.SendASDU(asdu);
}
else
{
ASDU sectionReady = new ASDU(alParameters, CauseOfTransmission.FILE_TRANSFER, false, false, 0, asdu.Ca, false);
sectionReady.AddInformationObject(new SectionReady(sc.ObjectAddress, selectedFile.provider.GetNameOfFile(), 0, 0, false));
connection.SendASDU(sectionReady);
logger("Send SECTION READY");
currentSectionNumber = 0;
currentSectionOffset = 0;
currentSectionSize = selectedFile.provider.GetSectionSize(0);
transferState = FileServerState.WAITING_FOR_SECTION_CALL;
}
}
else
{
logger("Unexpected FILE CALL message");
}
}
else if (sc.SCQ == SelectAndCallQualifier.REQUEST_SECTION)
{
logger("Received CALL SECTION");
if (transferState == FileServerState.WAITING_FOR_SECTION_CALL)
{
if (selectedFile.provider.GetIOA() != sc.ObjectAddress)
{
logger("Unkown IOA");
asdu.Cot = CauseOfTransmission.UNKNOWN_INFORMATION_OBJECT_ADDRESS;
connection.SendASDU(asdu);
}
else
{
transferState = FileServerState.TRANSMIT_SECTION;
}
}
else
{
logger("Unexpected SECTION CALL message");
}
}
}
else if (asdu.Cot == CauseOfTransmission.REQUEST)
{
logger("Call directory received");
availableFiles.SendDirectoy(connection, false);
}
else
{
asdu.Cot = CauseOfTransmission.UNKNOWN_CAUSE_OF_TRANSMISSION;
connection.SendASDU(asdu);
}
break;
default:
handled = false;
break;
}
return(handled);
}