Added hyperkit options for enterprise VPN support

The purpose of these changes is to enhance Hyperkit support from the
minikube command line for better integration with enterprise networks
behind a VPN.

uuid: Provide VM UUID to restore MAC address (only supported with
      Hyperkit driver).
vpnkitSock: Location of the VPNKit socket used for networking. If empty,
            disables Hyperkit VPNKitSock, if 'auto' uses Docker for Mac
            VPNKit connection, otherwise uses the specified VSock."
vsockPorts: List of guest VSock ports that should be exposed as sockets
            on the host (Only supported on with hyperkit now).

Note:
tests pass but file:
`vendor/github.com/google/certificate-transparency/go/x509/root_darwin.go`
has to be edited to correct an issue - not committed since this is in
the vendor directory.

cmd/minikube/cmd/start.go

@@ -70,6 +70,8 @@ const (
 	disableDriverMounts   = "disable-driver-mounts"
 	cacheImages           = "cache-images"
 	uuid                  = "uuid"
+	vpnkitSock            = "hyperkit-vpnkit-sock"
+	vsockPorts            = "hyperkit-vsock-ports"
 )
 
 var (
@@ -135,6 +137,8 @@ func runStart(cmd *cobra.Command, args []string) {
 		CPUs:                viper.GetInt(cpus),
 		DiskSize:            diskSizeMB,
 		VMDriver:            viper.GetString(vmDriver),
+		HyperkitVpnKitSock:  viper.GetString(vpnkitSock),
+		HyperkitVSockPorts:  viper.GetStringSlice(vsockPorts),
 		XhyveDiskDriver:     viper.GetString(xhyveDiskDriver),
 		NFSShare:            viper.GetStringSlice(NFSShare),
 		NFSSharesRoot:       viper.GetString(NFSSharesRoot),
@@ -321,8 +325,7 @@ func runStart(cmd *cobra.Command, args []string) {
 		if viper.GetBool(cfg.WantNoneDriverWarning) {
 			fmt.Println(`===================
 WARNING: IT IS RECOMMENDED NOT TO RUN THE NONE DRIVER ON PERSONAL WORKSTATIONS
-	The 'none' driver will run an insecure kubernetes apiserver as root that may leave the host vulnerable to CSRF attacks
-`)
+	The 'none' driver will run an insecure kubernetes apiserver as root that may leave the host vulnerable to CSRF attacks` + "\n")
 		}
 
 		if os.Getenv("CHANGE_MINIKUBE_NONE_USER") == "" {
@@ -399,6 +402,9 @@ func init() {
 		`A set of key=value pairs that describe configuration that may be passed to different components.
 		The key should be '.' separated, and the first part before the dot is the component to apply the configuration to.
 		Valid components are: kubelet, apiserver, controller-manager, etcd, proxy, scheduler.`)
+	startCmd.Flags().String(uuid, "", "Provide VM UUID to restore MAC address (only supported with Hyperkit driver).")
+	startCmd.Flags().String(vpnkitSock, "", "Location of the VPNKit socket used for networking. If empty, disables Hyperkit VPNKitSock, if 'auto' uses Docker for Mac VPNKit connection, otherwise uses the specified VSock.")
+	startCmd.Flags().StringSlice(vsockPorts, []string{}, "List of guest VSock ports that should be exposed as sockets on the host (Only supported on with hyperkit now).")
 	viper.BindPFlags(startCmd.Flags())
 	RootCmd.AddCommand(startCmd)
 }

pkg/drivers/hyperkit/driver.go

@@ -25,6 +25,7 @@ import (
 	"os/user"
 	"path"
 	"path/filepath"
+	"strconv"
 	"strings"
 	"syscall"
 	"time"
@@ -59,6 +60,8 @@ type Driver struct {
 	NFSShares      []string
 	NFSSharesRoot  string
 	UUID           string
+	VpnKitSock     string
+	VSockPorts     []string
 }
 
 func NewDriver(hostName, storePath string) *Driver {
@@ -92,7 +95,7 @@ func (d *Driver) Create() error {
 
 	isoPath := d.ResolveStorePath(isoFilename)
 	if err := d.extractKernel(isoPath); err != nil {
-		return err
+		return errors.Wrap(err, "extracting kernel")
 	}
 
 	return d.Start()
@@ -164,9 +167,9 @@ func (d *Driver) Restart() error {
 
 // Start a host
 func (d *Driver) Start() error {
-	h, err := hyperkit.New("", "", filepath.Join(d.StorePath, "machines", d.MachineName))
+	h, err := hyperkit.New("", d.VpnKitSock, filepath.Join(d.StorePath, "machines", d.MachineName))
 	if err != nil {
-		return err
+		return errors.Wrap(err, "new-ing Hyperkit")
 	}
 
 	// TODO: handle the rest of our settings.
@@ -179,10 +182,17 @@ func (d *Driver) Start() error {
 	h.Memory = d.Memory
 	h.UUID = d.UUID
 
+	if vsockPorts, err := d.extractVSockPorts(); err != nil {
+		return err
+	} else if len(vsockPorts) >= 1 {
+		h.VSock = true
+		h.VSockPorts = vsockPorts
+	}
+
 	log.Infof("Using UUID %s", h.UUID)
 	mac, err := GetMACAddressFromUUID(h.UUID)
 	if err != nil {
-		return err
+		return errors.Wrap(err, "getting MAC address from UUID")
 	}
 
 	// Need to strip 0's
@@ -197,7 +207,7 @@ func (d *Driver) Start() error {
 	}
 	log.Infof("Starting with cmdline: %s", d.Cmdline)
 	if err := h.Start(d.Cmdline); err != nil {
-		return err
+		return errors.Wrapf(err, "starting with cmd line: %s", d.Cmdline)
 	}
 
 	getIP := func() error {
@@ -250,6 +260,32 @@ func (d *Driver) extractKernel(isoPath string) error {
 	return nil
 }
 
+// InvalidPortNumberError implements the Error interface.
+// It is used when a VSockPorts port number cannot be recognised as an integer.
+type InvalidPortNumberError string
+
+// Error returns an Error for InvalidPortNumberError
+func (port InvalidPortNumberError) Error() string {
+	return fmt.Sprintf("vsock port '%s' is not an integer", string(port))
+}
+
+func (d *Driver) extractVSockPorts() ([]int, error) {
+	vsockPorts := make([]int, 0, len(d.VSockPorts))
+
+	for _, port := range d.VSockPorts {
+		p, err := strconv.Atoi(port)
+		if err != nil {
+			// return nil, errors.Wrapf(err, "vsock port '%s' is not an integer", port)
+			var err InvalidPortNumberError
+			err = InvalidPortNumberError(port)
+			return nil, err
+		}
+		vsockPorts = append(vsockPorts, p)
+	}
+
+	return vsockPorts, nil
+}
+
 func (d *Driver) setupNFSShare() error {
 	user, err := user.Current()
 	if err != nil {

pkg/drivers/hyperkit/driver_test.go

@@ -0,0 +1,86 @@
+// +build darwin
+
+/*
+Copyright 2018 The Kubernetes Authors All rights reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package hyperkit
+
+import (
+	"testing"
+)
+
+func Test_portExtraction(t *testing.T) {
+	tests := []struct {
+		name    string
+		ports   []string
+		want    []int
+		wantErr error
+	}{
+		{
+			"valid_empty",
+			[]string{},
+			[]int{},
+			nil,
+		},
+		{
+			"valid_list",
+			[]string{"10", "20", "30"},
+			[]int{10, 20, 30},
+			nil,
+		},
+		{
+			"invalid",
+			[]string{"8080", "not_an_integer"},
+			nil,
+			InvalidPortNumberError("not_an_integer"),
+		},
+	}
+
+	for _, tt := range tests {
+		d := NewDriver("", "")
+		d.VSockPorts = tt.ports
+		got, gotErr := d.extractVSockPorts()
+		if !testEq(got, tt.want) {
+			t.Errorf("extractVSockPorts() got: %v, want: %v", got, tt.want)
+		}
+		if gotErr != tt.wantErr {
+			t.Errorf("extractVSockPorts() gotErr: %s, wantErr: %s", gotErr.Error(), tt.wantErr.Error())
+		}
+	}
+}
+
+func testEq(a, b []int) bool {
+
+	if a == nil && b == nil {
+		return true
+	}
+
+	if a == nil || b == nil {
+		return false
+	}
+
+	if len(a) != len(b) {
+		return false
+	}
+
+	for i := range a {
+		if a[i] != b[i] {
+			return false
+		}
+	}
+
+	return true
+}

pkg/minikube/config/types.go

@@ -35,6 +35,8 @@ type MachineConfig struct {
 	CPUs                int
 	DiskSize            int
 	VMDriver            string
+	HyperkitVpnKitSock  string   // Only used by the Hyperkit driver
+	HyperkitVSockPorts  []string // Only used by the Hyperkit driver
 	XhyveDiskDriver     string   // Only used by the xhyve driver
 	DockerEnv           []string // Each entry is formatted as KEY=VALUE.
 	InsecureRegistry    []string

pkg/minikube/drivers/hyperkit/driver.go

@@ -36,6 +36,11 @@ func init() {
 }
 
 func createHyperkitHost(config cfg.MachineConfig) interface{} {
+	uuID := config.UUID
+	if uuID == "" {
+		uuID = uuid.NewUUID().String()
+	}
+
 	return &hyperkit.Driver{
 		BaseDriver: &drivers.BaseDriver{
 			MachineName: cfg.GetMachineName(),
@@ -48,7 +53,9 @@ func createHyperkitHost(config cfg.MachineConfig) interface{} {
 		CPU:            config.CPUs,
 		NFSShares:      config.NFSShare,
 		NFSSharesRoot:  config.NFSSharesRoot,
-		UUID:           uuid.NewUUID().String(),
+		UUID:           uuID,
+		VpnKitSock:     config.HyperkitVpnKitSock,
+		VSockPorts:     config.HyperkitVSockPorts,
 		Cmdline:        "loglevel=3 user=docker console=ttyS0 console=tty0 noembed nomodeset norestore waitusb=10 systemd.legacy_systemd_cgroup_controller=yes base host=" + cfg.GetMachineName(),
 	}
 }