[client] Refactor/iface pkg (#2646)

Refactor the flat code structure

client/iface/device/device_android.go

@@ -0,0 +1,140 @@
+//go:build android
+
+package device
+
+import (
+	"strings"
+
+	"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"
+)
+
+// WGTunDevice ignore the WGTunDevice interface on Android because the creation of the tun device is different on this platform
+type WGTunDevice struct {
+	address    WGAddress
+	port       int
+	key        string
+	mtu        int
+	iceBind    *bind.ICEBind
+	tunAdapter TunAdapter
+
+	name           string
+	device         *device.Device
+	filteredDevice *FilteredDevice
+	udpMux         *bind.UniversalUDPMuxDefault
+	configurer     WGConfigurer
+}
+
+func NewTunDevice(address WGAddress, port int, key string, mtu int, transportNet transport.Net, tunAdapter TunAdapter, filterFn bind.FilterFn) *WGTunDevice {
+	return &WGTunDevice{
+		address:    address,
+		port:       port,
+		key:        key,
+		mtu:        mtu,
+		iceBind:    bind.NewICEBind(transportNet, filterFn),
+		tunAdapter: tunAdapter,
+	}
+}
+
+func (t *WGTunDevice) Create(routes []string, dns string, searchDomains []string) (WGConfigurer, error) {
+	log.Info("create tun interface")
+
+	routesString := routesToString(routes)
+	searchDomainsToString := searchDomainsToString(searchDomains)
+
+	fd, err := t.tunAdapter.ConfigureInterface(t.address.String(), t.mtu, dns, searchDomainsToString, routesString)
+	if err != nil {
+		log.Errorf("failed to create Android interface: %s", err)
+		return nil, err
+	}
+
+	tunDevice, name, err := tun.CreateUnmonitoredTUNFromFD(fd)
+	if err != nil {
+		_ = unix.Close(fd)
+		log.Errorf("failed to create Android interface: %s", err)
+		return nil, err
+	}
+	t.name = name
+	t.filteredDevice = newDeviceFilter(tunDevice)
+
+	log.Debugf("attaching to interface %v", name)
+	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 *WGTunDevice) 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 *WGTunDevice) UpdateAddr(addr WGAddress) error {
+	// todo implement
+	return nil
+}
+
+func (t *WGTunDevice) 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 *WGTunDevice) Device() *device.Device {
+	return t.device
+}
+
+func (t *WGTunDevice) DeviceName() string {
+	return t.name
+}
+
+func (t *WGTunDevice) WgAddress() WGAddress {
+	return t.address
+}
+
+func (t *WGTunDevice) FilteredDevice() *FilteredDevice {
+	return t.filteredDevice
+}
+
+func routesToString(routes []string) string {
+	return strings.Join(routes, ";")
+}
+
+func searchDomainsToString(searchDomains []string) string {
+	return strings.Join(searchDomains, ";")
+}