/// <summary>
/// Packet data is only valid until the next call
/// </summary>
/// <param name="e"></param>
/// <returns>Status of the operation</returns>
public GetPacketStatus GetNextPacket(out PacketCapture e)
{
ThrowIfNotOpen();
while (true)
{
bool ret;
WinDivertAddress addr;
uint readLen;
unsafe
{
fixed(byte *p = buffer)
{
ret = WinDivertNative.WinDivertRecv(Handle, new IntPtr(p), (uint)buffer.Length, out readLen, out addr);
}
}
if (!ret)
{
var err = Marshal.GetLastWin32Error();
if (err == ERROR_INSUFFICIENT_BUFFER)
{
// Increase buffer size
buffer = new byte[buffer.Length * 2];
continue;
}
if (err == ERROR_NO_DATA)
{
e = default;
return((GetPacketStatus)(-err));
}
ThrowWin32Error("Recv failed", err);
}
var timestamp = new PosixTimeval(BootTime + TimeSpan.FromTicks(addr.Timestamp));
var data = new ReadOnlySpan <byte>(buffer, 0, (int)readLen);
var header = new WinDivertHeader(timestamp)
{
InterfaceIndex = addr.IfIdx,
SubInterfaceIndex = addr.SubIfIdx,
Flags = addr.Flags
};
e = new PacketCapture(this, header, data);
return(GetPacketStatus.PacketRead);
}
}
public RawCapture GetNextPacket()
{
ThrowIfNotOpen();
Span <byte> buffer = stackalloc byte[4096];
while (true)
{
bool ret;
WinDivertAddress addr;
uint readLen;
unsafe
{
fixed(byte *p = buffer)
{
ret = WinDivertNative.WinDivertRecv(Handle, new IntPtr(p), (uint)buffer.Length, out readLen, out addr);
}
}
if (!ret)
{
var err = Marshal.GetLastWin32Error();
if (err == ERROR_INSUFFICIENT_BUFFER)
{
// Increase buffer size
buffer = stackalloc byte[buffer.Length * 2];
continue;
}
if (err == ERROR_NO_DATA)
{
return(null);
}
ThrowWin32Error("Recv failed", err);
}
var timestamp = new PosixTimeval(BootTime + TimeSpan.FromTicks(addr.Timestamp));
var data = buffer.Slice(0, (int)readLen).ToArray();
var raw = new WinDivertCapture(timestamp, data)
{
InterfaceIndex = addr.IfIdx,
SubInterfaceIndex = addr.SubIfIdx,
Flags = addr.Flags,
};
return(raw);
}
}