private void CaptureThread()
{
if (!Opened)
{
throw new PcapDeviceNotReadyException("Capture called before PcapDevice.Open()");
}
SafeNativeMethods.pcap_handler Callback = new SafeNativeMethods.pcap_handler(PacketHandler);
while (!shouldCaptureThreadStop)
{
int res = SafeNativeMethods.pcap_dispatch(PcapHandle, m_pcapPacketCount, Callback, IntPtr.Zero);
// pcap_dispatch() returns the number of packets read or, a status value if the value
// is negative
if (res <= 0)
{
switch (res) // Check pcap loop status results and notify upstream.
{
case Pcap.LOOP_USER_TERMINATED: // User requsted loop termination with StopCapture()
SendCaptureStoppedEvent(false);
return;
case Pcap.LOOP_COUNT_EXHAUSTED: // m_pcapPacketCount exceeded (successful exit)
{
// NOTE: pcap_dispatch() returns 0 when a timeout occurrs so to prevent timeouts
// from causing premature exiting from the capture loop we only consider
// exhausted events to cause an escape from the loop when they are from
// offline devices, ie. files read from disk
if (this is PcapOfflineDevice)
{
SendCaptureStoppedEvent(false);
return;
}
break;
}
case Pcap.LOOP_EXIT_WITH_ERROR: // An error occoured whilst capturing.
SendCaptureStoppedEvent(true);
return;
default: // This can only be triggered by a bug in libpcap.
throw new PcapException("Unknown pcap_loop exit status.");
}
}
}
SendCaptureStoppedEvent(false);
}
private void CaptureThread()
{
if (!Opened)
throw new PcapDeviceNotReadyException("Capture called before PcapDevice.Open()");
SafeNativeMethods.pcap_handler Callback = new SafeNativeMethods.pcap_handler(PacketHandler);
while(!shouldCaptureThreadStop)
{
int res = SafeNativeMethods.pcap_dispatch(PcapHandle, m_pcapPacketCount, Callback, IntPtr.Zero);
// pcap_dispatch() returns the number of packets read or, a status value if the value
// is negative
if(res <= 0)
{
switch (res) // Check pcap loop status results and notify upstream.
{
case Pcap.LOOP_USER_TERMINATED: // User requsted loop termination with StopCapture()
SendCaptureStoppedEvent(false);
return;
case Pcap.LOOP_COUNT_EXHAUSTED: // m_pcapPacketCount exceeded (successful exit)
{
// NOTE: pcap_dispatch() returns 0 when a timeout occurrs so to prevent timeouts
// from causing premature exiting from the capture loop we only consider
// exhausted events to cause an escape from the loop when they are from
// offline devices, ie. files read from disk
if(this is PcapOfflineDevice)
{
SendCaptureStoppedEvent(false);
return;
}
break;
}
case Pcap.LOOP_EXIT_WITH_ERROR: // An error occoured whilst capturing.
SendCaptureStoppedEvent(true);
return;
default: // This can only be triggered by a bug in libpcap.
throw new PcapException("Unknown pcap_loop exit status.");
}
}
}
SendCaptureStoppedEvent(false);
}
