/// <summary>
///
/// </summary>
/// <param name="captureFilename">
/// A <see cref="System.String"/>
/// </param>
public CaptureFileReaderDevice(string captureFilename)
{
m_pcapFile = captureFilename;
// holds errors
StringBuilder errbuf = new StringBuilder(Pcap.PCAP_ERRBUF_SIZE); //will hold errors
// opens offline pcap file
IntPtr adapterHandle = LibPcapSafeNativeMethods.pcap_open_offline(captureFilename, errbuf);
// handle error
if (adapterHandle == IntPtr.Zero)
{
string err = "Unable to open offline adapter: " + errbuf.ToString();
throw new PcapException(err);
}
// set the device handle
PcapHandle = adapterHandle;
}
/// <summary>
/// Open the device
/// </summary>
public override void Open(DeviceConfiguration configuration)
{
// holds errors
StringBuilder errbuf = new StringBuilder(Pcap.PCAP_ERRBUF_SIZE); //will hold errors
PcapHandle adapterHandle;
// Check if we need to open with a defined precision
var has_offline_with_tstamp_precision_support = Pcap.LibpcapVersion >= new Version(1, 5, 1);
var resolution = configuration.TimestampResolution ?? TimestampResolution.Microsecond;
if (has_offline_with_tstamp_precision_support)
{
adapterHandle = LibPcapSafeNativeMethods.pcap_open_offline_with_tstamp_precision(m_pcapFile, (uint)resolution, errbuf);
}
else
{
// notify the user that they asked for a non-standard resolution but their libpcap
// version lacks the necessary function
if (resolution != TimestampResolution.Microsecond)
{
configuration.RaiseConfigurationFailed(
nameof(configuration.TimestampResolution),
(int)PcapError.PlatformNotSupported,
"pcap version is < 1.5.1, needs pcap_open_offline_with_tstamp_precision()"
);
}
adapterHandle = LibPcapSafeNativeMethods.pcap_open_offline(m_pcapFile, errbuf);
}
// handle error
if (adapterHandle.IsInvalid)
{
string err = "Unable to open offline adapter: " + errbuf.ToString();
throw new PcapException(err);
}
// set the device handle
Handle = adapterHandle;
base.Open(configuration);
}