public void MainLoop()
{
// Init socket
// var socketFileDescriptorFlags = Check(Fcntl(UdpSocket, F_GETFL, 0));
// Check(Fcntl(socketFileDescriptor, F_SETFL, socketFileDescriptorFlags | O_NONBLOCK));
_logger.LogInformation("Start listening on {bindAddress}:{bindPort}", ListenEndPoint.Address, ListenEndPoint.Port);
// Register to server
Register();
// Create epoll
const int maxEvents = 64;
using var epollFileDescriptor = EpollCreate();
// Add tun to epoll
var tunEpollEvent = new EpollEvent();
tunEpollEvent.events = EpollEvents.EPOLLIN | EpollEvents.EPOLLOUT;
tunEpollEvent.fd = (int)Tun.TunFileDescriptor.DangerousGetHandle().ToInt64();
Check(EpollCtl(epollFileDescriptor, EPOLL_CTL_ADD, Tun.TunFileDescriptor, ref tunEpollEvent));
// Add UDP socket to epoll
var socketEpollEvent = new EpollEvent();
socketEpollEvent.events = EpollEvents.EPOLLIN | EpollEvents.EPOLLOUT;
tunEpollEvent.fd = (int)UdpSocket.SocketFileDescriptor.DangerousGetHandle().ToInt64();
Check(EpollCtl(epollFileDescriptor, EPOLL_CTL_ADD, UdpSocket.SocketFileDescriptor, ref socketEpollEvent));
// main loop
Message message;
IPEndPoint remote;
TunFrame tunFrame;
var epollReceivedEvents = new EpollEvent[maxEvents];
while (true)
{
var epollWaitRet = Check(EpollWait(epollFileDescriptor, epollReceivedEvents, maxEvents, -1));
for (var i = 0; i < epollWaitRet; i++)
{
var fd = epollReceivedEvents[i].fd;
if (epollReceivedEvents[i].events == EpollEvents.EPOLLIN)
{
if (fd == Tun.TunFileDescriptor)
{
var data = Tun.Read(BufferSize);
TunnelSendQueue.Enqueue(new TunFrame(data));
}
else if (fd == UdpSocket.SocketFileDescriptor)
{
var data = UdpSocket.Recv(BufferSize, out remote);
message = DeserializeMessage(data);
ListenDispatch(message, remote);
}
else
{
throw new AliceException("Unexpected file descriptor");
}
}
else if (epollReceivedEvents[i].events == EpollEvents.EPOLLOUT)
{
if (fd == Tun.TunFileDescriptor)
{
if (TunnelReceiveQueue.TryDequeue(out tunFrame))
{
Tun.Write(tunFrame.FrameData);
}
}
else if (fd == UdpSocket.SocketFileDescriptor)
{
if (TunnelSendQueue.TryDequeue(out tunFrame))
{
SendTunnel(tunFrame);
}
}
}
}
}
}