Public Release

tun_windows.go

@@ -0,0 +1,72 @@
+package nebula
+
+import (
+	"fmt"
+	"net"
+	"os/exec"
+
+	"github.com/songgao/water"
+)
+
+type Tun struct {
+	Device string
+	Cidr   *net.IPNet
+	MTU    int
+
+	*water.Interface
+}
+
+func newTun(deviceName string, cidr *net.IPNet, defaultMTU int, routes []route, txQueueLen int) (ifce *Tun, err error) {
+	if len(routes) > 0 {
+		return nil, fmt.Errorf("Route MTU not supported in Windows")
+	}
+	// NOTE: You cannot set the deviceName under Windows, so you must check tun.Device after calling .Activate()
+	return &Tun{
+		Cidr: cidr,
+		MTU:  defaultMTU,
+	}, nil
+}
+
+func (c *Tun) 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(
+		"netsh", "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(
+		"netsh", "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)
+	}
+
+	return nil
+}
+
+func (c *Tun) WriteRaw(b []byte) error {
+	_, err := c.Write(b)
+	return err
+}