Netstack (#1403)

Add netstack support for the agent to run it without privileges.

- use interface for tun device
- use common IPC for userspace WireGuard integration
- move udpmux creation and sharedsock to tun layer

iface/tun_darwin.go

@@ -6,32 +6,129 @@ package iface
 import (
 	"os/exec"
 
+	"github.com/pion/transport/v3"
 	log "github.com/sirupsen/logrus"
+	"golang.zx2c4.com/wireguard/device"
+	"golang.zx2c4.com/wireguard/tun"
+
+	"github.com/netbirdio/netbird/iface/bind"
 )
 
-func (c *tunDevice) Create() error {
-	var err error
-	c.netInterface, err = c.createWithUserspace()
+type tunDevice struct {
+	name    string
+	address WGAddress
+	port    int
+	key     string
+	mtu     int
+	iceBind *bind.ICEBind
+
+	device     *device.Device
+	wrapper    *DeviceWrapper
+	udpMux     *bind.UniversalUDPMuxDefault
+	configurer wgConfigurer
+}
+
+func newTunDevice(name string, address WGAddress, port int, key string, mtu int, transportNet transport.Net) wgTunDevice {
+	return &tunDevice{
+		name:    name,
+		address: address,
+		port:    port,
+		key:     key,
+		mtu:     mtu,
+		iceBind: bind.NewICEBind(transportNet),
+	}
+}
+
+func (t *tunDevice) Create() (wgConfigurer, error) {
+	tunDevice, err := tun.CreateTUN(t.name, t.mtu)
 	if err != nil {
-		return err
+		return nil, err
+	}
+	t.wrapper = newDeviceWrapper(tunDevice)
+
+	// We need to create a wireguard-go device and listen to configuration requests
+	t.device = device.NewDevice(
+		t.wrapper,
+		t.iceBind,
+		device.NewLogger(device.LogLevelSilent, "[netbird] "),
+	)
+
+	err = t.assignAddr()
+	if err != nil {
+		t.device.Close()
+		return nil, err
 	}
 
-	return c.assignAddr()
+	t.configurer = newWGUSPConfigurer(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) 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) Wrapper() *DeviceWrapper {
+	return t.wrapper
 }
 
 // assignAddr Adds IP address to the tunnel interface and network route based on the range provided
-func (c *tunDevice) assignAddr() error {
-	cmd := exec.Command("ifconfig", c.name, "inet", c.address.IP.String(), c.address.IP.String())
+func (t *tunDevice) assignAddr() error {
+	cmd := exec.Command("ifconfig", t.name, "inet", t.address.IP.String(), t.address.IP.String())
 	if out, err := cmd.CombinedOutput(); err != nil {
 		log.Infof(`adding address command "%v" failed with output %s and error: `, cmd.String(), out)
 		return err
 	}
 
-	routeCmd := exec.Command("route", "add", "-net", c.address.Network.String(), "-interface", c.name)
+	routeCmd := exec.Command("route", "add", "-net", t.address.Network.String(), "-interface", t.name)
 	if out, err := routeCmd.CombinedOutput(); err != nil {
 		log.Printf(`adding route command "%v" failed with output %s and error: `, routeCmd.String(), out)
 		return err
 	}
-
 	return nil
 }