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

client/internal/routemanager/manager_test.go

@@ -8,6 +8,7 @@ import (
 	"testing"
 
 	"github.com/pion/transport/v3/stdnet"
+	"golang.zx2c4.com/wireguard/wgctrl/wgtypes"
 
 	"github.com/stretchr/testify/require"
 
@@ -399,12 +400,12 @@ func TestManagerUpdateRoutes(t *testing.T) {
 
 	for n, testCase := range testCases {
 		t.Run(testCase.name, func(t *testing.T) {
-
+			peerPrivateKey, _ := wgtypes.GeneratePrivateKey()
 			newNet, err := stdnet.NewNet()
 			if err != nil {
 				t.Fatal(err)
 			}
-			wgInterface, err := iface.NewWGIFace(fmt.Sprintf("utun43%d", n), "100.65.65.2/24", iface.DefaultMTU, nil, newNet)
+			wgInterface, err := iface.NewWGIFace(fmt.Sprintf("utun43%d", n), "100.65.65.2/24", 33100, peerPrivateKey.String(), iface.DefaultMTU, newNet, nil)
 			require.NoError(t, err, "should create testing WGIface interface")
 			defer wgInterface.Close()