Move all of tun into overlay (#577)

overlay/tun_water_windows.go

@@ -0,0 +1,107 @@
+package overlay
+
+import (
+	"fmt"
+	"io"
+	"net"
+	"os/exec"
+	"strconv"
+
+	"github.com/songgao/water"
+)
+
+type WindowsWaterTun struct {
+	Device       string
+	Cidr         *net.IPNet
+	MTU          int
+	UnsafeRoutes []Route
+
+	*water.Interface
+}
+
+func newWindowsWaterTun(deviceName string, cidr *net.IPNet, defaultMTU int, unsafeRoutes []Route, txQueueLen int) (ifce *WindowsWaterTun, err error) {
+	// NOTE: You cannot set the deviceName under Windows, so you must check tun.Device after calling .Activate()
+	return &WindowsWaterTun{
+		Cidr:         cidr,
+		MTU:          defaultMTU,
+		UnsafeRoutes: unsafeRoutes,
+	}, nil
+}
+
+func (c *WindowsWaterTun) Activate() error {
+	var err error
+	c.Interface, err = water.New(water.Config{
+		DeviceType: water.TUN,
+		PlatformSpecificParams: water.PlatformSpecificParams{
+			ComponentID: "tap0901",
+			Network:     c.Cidr.String(),
+		},
+	})
+	if err != nil {
+		return fmt.Errorf("Activate failed: %v", err)
+	}
+
+	c.Device = c.Interface.Name()
+
+	// TODO use syscalls instead of exec.Command
+	err = exec.Command(
+		`C:\Windows\System32\netsh.exe`, "interface", "ipv4", "set", "address",
+		fmt.Sprintf("name=%s", c.Device),
+		"source=static",
+		fmt.Sprintf("addr=%s", c.Cidr.IP),
+		fmt.Sprintf("mask=%s", net.IP(c.Cidr.Mask)),
+		"gateway=none",
+	).Run()
+	if err != nil {
+		return fmt.Errorf("failed to run 'netsh' to set address: %s", err)
+	}
+	err = exec.Command(
+		`C:\Windows\System32\netsh.exe`, "interface", "ipv4", "set", "interface",
+		c.Device,
+		fmt.Sprintf("mtu=%d", c.MTU),
+	).Run()
+	if err != nil {
+		return fmt.Errorf("failed to run 'netsh' to set MTU: %s", err)
+	}
+
+	iface, err := net.InterfaceByName(c.Device)
+	if err != nil {
+		return fmt.Errorf("failed to find interface named %s: %v", c.Device, err)
+	}
+
+	for _, r := range c.UnsafeRoutes {
+		err = exec.Command(
+			"C:\\Windows\\System32\\route.exe", "add", r.Cidr.String(), r.Via.String(), "IF", strconv.Itoa(iface.Index), "METRIC", strconv.Itoa(r.Metric),
+		).Run()
+		if err != nil {
+			return fmt.Errorf("failed to add the unsafe_route %s: %v", r.Cidr.String(), err)
+		}
+	}
+
+	return nil
+}
+
+func (c *WindowsWaterTun) CidrNet() *net.IPNet {
+	return c.Cidr
+}
+
+func (c *WindowsWaterTun) DeviceName() string {
+	return c.Device
+}
+
+func (c *WindowsWaterTun) WriteRaw(b []byte) error {
+	_, err := c.Write(b)
+	return err
+}
+
+func (c *WindowsWaterTun) Close() error {
+	if c.Interface == nil {
+		return nil
+	}
+
+	return c.Interface.Close()
+}
+
+func (t *WindowsWaterTun) NewMultiQueueReader() (io.ReadWriteCloser, error) {
+	return nil, fmt.Errorf("TODO: multiqueue not implemented for windows")
+}