public void WriteFrame(PcapFrame frame, bool flush)
{
TimeSpan delta = frame.Timestamp.Subtract(this.referenceTime);
//The smallest unit of time is the tick, which is equal to 100 nanoseconds. A tick can be negative or positive.
long totalMicroseconds = delta.Ticks / 10;
uint seconds = (uint)(totalMicroseconds / 1000000);
uint microseconds = (uint)(totalMicroseconds % 1000000);
fileStream.Write(ToByteArray(seconds), 0, 4);
fileStream.Write(ToByteArray(microseconds), 0, 4);
//number of octets of packet saved in file
fileStream.Write(ToByteArray((uint)frame.Data.Length), 0, 4);
//actual length of packet
fileStream.Write(ToByteArray((uint)frame.Data.Length), 0, 4);
//data
fileStream.Write(frame.Data, 0, frame.Data.Length);
if (flush)
{
fileStream.Flush();
}
framesWritten++;
}
public void WriteFrame(PcapFrame frame)
{
WriteFrame(frame, false);
}
public PcapStreamReader(System.IO.Stream pcapStream, int packetQueueSize, StreamReadCompletedCallback streamReadCompletedCallback, bool startBackgroundWorkers, long streamMaxLength, int readTimeoutMilliseconds)
{
this.pcapStream = pcapStream;
this.streamLength = streamMaxLength;
this.readBytesEstimate = 0;
this.readTimeoutMilliseconds = readTimeoutMilliseconds;
this.packetQueueMaxSize = packetQueueSize;
this.streamReadCompletedCallback = streamReadCompletedCallback;
//TODO: Figure out if it is a libpcap or pcapNG stream...
this.pcapParser = PcapParserFactory.CreatePcapParser(this);// new PcapParser(pcapStream, this.AbortReadingPcapStream);
/*
* byte[] buffer4=new byte[4];//32 bits is suitable
* byte[] buffer2=new byte[2];//16 bits is sometimes needed
* uint wiresharkMagicNumber=0xa1b2c3d4;
*
* //Section Header Block (mandatory)
*
* this.pcapStream.Read(buffer4, 0, 4);
*
* if(wiresharkMagicNumber==this.ToUInt32(buffer4, false))
* this.littleEndian=false;
* else if(wiresharkMagicNumber==this.ToUInt32(buffer4, true))
* this.littleEndian=true;
* else
* throw new System.IO.InvalidDataException("The stream is not a PCAP file. Magic number is "+this.ToUInt32(buffer4, false).ToString("X2")+" or "+this.ToUInt32(buffer4, true).ToString("X2")+" but should be "+wiresharkMagicNumber.ToString("X2")+".");
*
*
* this.pcapStream.Read(buffer2, 0, 2);
* this.majorVersionNumber=ToUInt16(buffer2, this.littleEndian);
*
* this.pcapStream.Read(buffer2, 0, 2);
* this.minorVersionNumber=ToUInt16(buffer2, this.littleEndian);
*
* this.pcapStream.Read(buffer4, 0, 4);
* this.timezoneOffsetSeconds=(int)ToUInt32(buffer4, this.littleEndian);
*
* this.pcapStream.Read(buffer4, 0, 4);
*
* this.pcapStream.Read(buffer4, 0, 4);
* this.maximumPacketSize=ToUInt32(buffer4, this.littleEndian);
*
* this.pcapStream.Read(buffer4, 0, 4); //offset = 20 = 0x14
* this.dataLinkType=(DataLinkType)ToUInt32(buffer4, this.littleEndian);
*/
//this.pcapHeaderSize = this.pcapStream.Position;
//this.backgroundStreamReader = new System.Threading.Tasks.Task()
//this.backgroundStreamReader=new System.ComponentModel.BackgroundWorker();
//this.backgroundStreamReader.WorkerSupportsCancellation = true;
this.packetQueue = new Queue <PcapFrame>(this.packetQueueMaxSize);
this.packetQueueHasRoomEvent = new System.Threading.AutoResetEvent(true);
this.enqueuedByteCount = 0;
this.dequeuedByteCount = 0;
this.backgroundStreamReaderCanceller = new System.Threading.CancellationTokenSource();
System.Threading.CancellationToken cancellationToken = backgroundStreamReaderCanceller.Token;
this.readAction = new Action(() => {
DateTime firstFrameTimestamp = DateTime.MinValue;
DateTime lastFrameTimestamp = DateTime.MinValue;
int framesCount = 0;
try {
//int sleepMilliSecs = 20;
while (!cancellationToken.IsCancellationRequested && !this.EndOfStream())
{
if (this.packetQueue.Count < this.packetQueueMaxSize)
{
PcapFrame packet = this.pcapParser.ReadPcapPacketBlocking();
if (firstFrameTimestamp == DateTime.MinValue)
{
firstFrameTimestamp = packet.Timestamp;
}
lastFrameTimestamp = packet.Timestamp;
framesCount++;
lock (this.packetQueue) {
this.packetQueue.Enqueue(packet);
}
this.enqueuedByteCount += packet.Data.Length;
//sleepMilliSecs = 20;
}
else
{
//this.packetQueueHasRoomEvent.WaitOne();
bool signalReceived = this.packetQueueHasRoomEvent.WaitOne(1000);
#if DEBUG
if (!signalReceived)
{
System.Diagnostics.Debugger.Break();
}
#endif
/*System.Threading.Thread.Sleep(sleepMilliSecs);
* if (sleepMilliSecs < 1000)
* sleepMilliSecs+=10;*/
}
}
}
catch (System.IO.EndOfStreamException) {
//Do nothing, just stop reading
this.pcapStream = null;
}
catch (System.IO.IOException) {
//probably a socket timout
if (!(this.pcapStream is System.IO.FileStream) && this.pcapStream != null)
{
if (this.pcapStream.CanWrite)
{
this.pcapStream.Flush();
}
this.pcapStream.Dispose();
}
//this.pcapStream = null;
}
catch (OperationCanceledException) {
if (!(this.pcapStream is System.IO.FileStream) && this.pcapStream != null)
{
if (this.pcapStream.CanWrite)
{
this.pcapStream.Flush();
}
this.pcapStream.Dispose();
}
}
#if !DEBUG
catch (Exception ex) {
this.pcapStream = null;
//this.backgroundStreamReaderCanceller.Cancel();
//e.Cancel = true;
//e.Result = ex.Message;
this.AbortFileRead();
}
#endif
//do a callback with this.filename as well as first and last timestamp
if (this.streamReadCompletedCallback != null && firstFrameTimestamp != DateTime.MinValue && lastFrameTimestamp != DateTime.MinValue)
{
this.streamReadCompletedCallback(framesCount, firstFrameTimestamp, lastFrameTimestamp);
}
});
if (startBackgroundWorkers)
{
this.StartBackgroundWorkers();
}
}
