[client] Refactor/iface pkg (#2646)

Refactor the flat code structure

client/iface/device/device_windows.go

@@ -0,0 +1,172 @@
+package device
+
+import (
+	"fmt"
+	"net/netip"
+
+	"github.com/pion/transport/v3"
+	log "github.com/sirupsen/logrus"
+	"golang.org/x/sys/windows"
+	"golang.zx2c4.com/wireguard/device"
+	"golang.zx2c4.com/wireguard/tun"
+	"golang.zx2c4.com/wireguard/windows/tunnel/winipcfg"
+
+	"github.com/netbirdio/netbird/client/iface/bind"
+	"github.com/netbirdio/netbird/client/iface/configurer"
+)
+
+const defaultWindowsGUIDSTring = "{f2f29e61-d91f-4d76-8151-119b20c4bdeb}"
+
+type TunDevice struct {
+	name    string
+	address WGAddress
+	port    int
+	key     string
+	mtu     int
+	iceBind *bind.ICEBind
+
+	device          *device.Device
+	nativeTunDevice *tun.NativeTun
+	filteredDevice  *FilteredDevice
+	udpMux          *bind.UniversalUDPMuxDefault
+	configurer      WGConfigurer
+}
+
+func NewTunDevice(name string, address WGAddress, port int, key string, mtu int, transportNet transport.Net, filterFn bind.FilterFn) *TunDevice {
+	return &TunDevice{
+		name:    name,
+		address: address,
+		port:    port,
+		key:     key,
+		mtu:     mtu,
+		iceBind: bind.NewICEBind(transportNet, filterFn),
+	}
+}
+
+func getGUID() (windows.GUID, error) {
+	guidString := defaultWindowsGUIDSTring
+	if CustomWindowsGUIDString != "" {
+		guidString = CustomWindowsGUIDString
+	}
+	return windows.GUIDFromString(guidString)
+}
+
+func (t *TunDevice) Create() (WGConfigurer, error) {
+	guid, err := getGUID()
+	if err != nil {
+		log.Errorf("failed to get GUID: %s", err)
+		return nil, err
+	}
+	log.Info("create tun interface")
+	tunDevice, err := tun.CreateTUNWithRequestedGUID(t.name, &guid, t.mtu)
+	if err != nil {
+		return nil, fmt.Errorf("error creating tun device: %s", err)
+	}
+	t.nativeTunDevice = tunDevice.(*tun.NativeTun)
+	t.filteredDevice = newDeviceFilter(tunDevice)
+
+	// We need to create a wireguard-go device and listen to configuration requests
+	t.device = device.NewDevice(
+		t.filteredDevice,
+		t.iceBind,
+		device.NewLogger(wgLogLevel(), "[netbird] "),
+	)
+
+	luid := winipcfg.LUID(t.nativeTunDevice.LUID())
+
+	nbiface, err := luid.IPInterface(windows.AF_INET)
+	if err != nil {
+		t.device.Close()
+		return nil, fmt.Errorf("got error when getting ip interface %s", err)
+	}
+
+	nbiface.NLMTU = uint32(t.mtu)
+
+	err = nbiface.Set()
+	if err != nil {
+		t.device.Close()
+		return nil, fmt.Errorf("got error when getting setting the interface mtu: %s", err)
+	}
+	err = t.assignAddr()
+	if err != nil {
+		t.device.Close()
+		return nil, fmt.Errorf("error assigning ip: %s", err)
+	}
+
+	t.configurer = configurer.NewUSPConfigurer(t.device, t.name)
+	err = t.configurer.ConfigureInterface(t.key, t.port)
+	if err != nil {
+		t.device.Close()
+		t.configurer.Close()
+		return nil, fmt.Errorf("error configuring interface: %s", err)
+	}
+	return t.configurer, nil
+}
+
+func (t *TunDevice) Up() (*bind.UniversalUDPMuxDefault, error) {
+	err := t.device.Up()
+	if err != nil {
+		return nil, err
+	}
+
+	udpMux, err := t.iceBind.GetICEMux()
+	if err != nil {
+		return nil, err
+	}
+	t.udpMux = udpMux
+	log.Debugf("device is ready to use: %s", t.name)
+	return udpMux, nil
+}
+
+func (t *TunDevice) UpdateAddr(address WGAddress) error {
+	t.address = address
+	return t.assignAddr()
+}
+
+func (t *TunDevice) Close() error {
+	if t.configurer != nil {
+		t.configurer.Close()
+	}
+
+	if t.device != nil {
+		t.device.Close()
+		t.device = nil
+	}
+
+	if t.udpMux != nil {
+		return t.udpMux.Close()
+
+	}
+	return nil
+}
+func (t *TunDevice) WgAddress() WGAddress {
+	return t.address
+}
+
+func (t *TunDevice) DeviceName() string {
+	return t.name
+}
+
+func (t *TunDevice) FilteredDevice() *FilteredDevice {
+	return t.filteredDevice
+}
+
+func (t *TunDevice) GetInterfaceGUIDString() (string, error) {
+	if t.nativeTunDevice == nil {
+		return "", fmt.Errorf("interface has not been initialized yet")
+	}
+
+	luid := winipcfg.LUID(t.nativeTunDevice.LUID())
+	guid, err := luid.GUID()
+	if err != nil {
+		return "", err
+	}
+	return guid.String(), nil
+}
+
+// assignAddr Adds IP address to the tunnel interface and network route based on the range provided
+func (t *TunDevice) assignAddr() error {
+	luid := winipcfg.LUID(t.nativeTunDevice.LUID())
+	log.Debugf("adding address %s to interface: %s", t.address.IP, t.name)
+	return luid.SetIPAddresses([]netip.Prefix{netip.MustParsePrefix(t.address.String())})
+}