[client] Refactor/iface pkg (#2646)

Refactor the flat code structure

client/iface/device/device_ios.go

@@ -0,0 +1,134 @@
+//go:build ios
+// +build ios
+
+package device
+
+import (
+	"os"
+
+	"github.com/pion/transport/v3"
+	log "github.com/sirupsen/logrus"
+	"golang.org/x/sys/unix"
+	"golang.zx2c4.com/wireguard/device"
+	"golang.zx2c4.com/wireguard/tun"
+
+	"github.com/netbirdio/netbird/client/iface/bind"
+	"github.com/netbirdio/netbird/client/iface/configurer"
+)
+
+type TunDevice struct {
+	name    string
+	address WGAddress
+	port    int
+	key     string
+	iceBind *bind.ICEBind
+	tunFd   int
+
+	device         *device.Device
+	filteredDevice *FilteredDevice
+	udpMux         *bind.UniversalUDPMuxDefault
+	configurer     WGConfigurer
+}
+
+func NewTunDevice(name string, address WGAddress, port int, key string, transportNet transport.Net, tunFd int, filterFn bind.FilterFn) *TunDevice {
+	return &TunDevice{
+		name:    name,
+		address: address,
+		port:    port,
+		key:     key,
+		iceBind: bind.NewICEBind(transportNet, filterFn),
+		tunFd:   tunFd,
+	}
+}
+
+func (t *TunDevice) Create() (WGConfigurer, error) {
+	log.Infof("create tun interface")
+
+	dupTunFd, err := unix.Dup(t.tunFd)
+	if err != nil {
+		log.Errorf("Unable to dup tun fd: %v", err)
+		return nil, err
+	}
+
+	err = unix.SetNonblock(dupTunFd, true)
+	if err != nil {
+		log.Errorf("Unable to set tun fd as non blocking: %v", err)
+		_ = unix.Close(dupTunFd)
+		return nil, err
+	}
+	tunDevice, err := tun.CreateTUNFromFile(os.NewFile(uintptr(dupTunFd), "/dev/tun"), 0)
+	if err != nil {
+		log.Errorf("Unable to create new tun device from fd: %v", err)
+		_ = unix.Close(dupTunFd)
+		return nil, err
+	}
+
+	t.filteredDevice = newDeviceFilter(tunDevice)
+	log.Debug("Attaching to interface")
+	t.device = device.NewDevice(t.filteredDevice, t.iceBind, device.NewLogger(wgLogLevel(), "[wiretrustee] "))
+	// without this property mobile devices can discover remote endpoints if the configured one was wrong.
+	// this helps with support for the older NetBird clients that had a hardcoded direct mode
+	// t.device.DisableSomeRoamingForBrokenMobileSemantics()
+
+	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, 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) Device() *device.Device {
+	return t.device
+}
+
+func (t *TunDevice) DeviceName() string {
+	return t.name
+}
+
+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) UpdateAddr(addr WGAddress) error {
+	// todo implement
+	return nil
+}
+
+func (t *TunDevice) FilteredDevice() *FilteredDevice {
+	return t.filteredDevice
+}