public Stream Open()
{
var descriptor = Syscall.open("/dev/net/tun", OpenFlags.O_RDWR);
if (descriptor < 0)
{
logger.Error($"/dev/net/tun open error: ret: {descriptor}; LastError: {Marshal.GetLastWin32Error()}");
return(null);
}
currentInterfaceInfo = new IfReq
{
Flags = tapIff | noPiIff
};
var ioctlRetCode = IoCtl(descriptor, 0x400454CA, ref currentInterfaceInfo);
if (ioctlRetCode < 0)
{
logger.Error($"ioctl error: ret: {ioctlRetCode}; LastError: {Marshal.GetLastWin32Error()}");
return(null);
}
currentPhysicalAddress = NetworkInterface.GetAllNetworkInterfaces().First(x => x.Description == currentInterfaceInfo.Name).GetPhysicalAddress();
logger.Info($"Opened TAP device: FD #{descriptor}; Name '{currentInterfaceInfo.Name}'; HW address: {currentPhysicalAddress}");
RenewDhcp(currentInterfaceInfo.Name);
currentStream = new RawUnixStream(descriptor);
return(currentStream);
}
private static extern int IoCtl(int descriptor, uint request, ref IfReq ifreq);