Public Release

tun_darwin.go

@@ -0,0 +1,59 @@
+package nebula
+
+import (
+	"fmt"
+	"net"
+	"os/exec"
+	"strconv"
+
+	"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 Darwin")
+	}
+	// NOTE: You cannot set the deviceName under Darwin, 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,
+	})
+	if err != nil {
+		return fmt.Errorf("Activate failed: %v", err)
+	}
+
+	c.Device = c.Interface.Name()
+
+	// TODO use syscalls instead of exec.Command
+	if err = exec.Command("ifconfig", c.Device, c.Cidr.String(), c.Cidr.IP.String()).Run(); err != nil {
+		return fmt.Errorf("failed to run 'ifconfig': %s", err)
+	}
+	if err = exec.Command("route", "-n", "add", "-net", c.Cidr.String(), "-interface", c.Device).Run(); err != nil {
+		return fmt.Errorf("failed to run 'route add': %s", err)
+	}
+	if err = exec.Command("ifconfig", c.Device, "mtu", strconv.Itoa(c.MTU)).Run(); err != nil {
+		return fmt.Errorf("failed to run 'ifconfig': %s", err)
+	}
+
+	return nil
+}
+
+func (c *Tun) WriteRaw(b []byte) error {
+	_, err := c.Write(b)
+	return err
+}