nebula/tun_darwin.go

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2019-11-19 10:00:20 -07:00
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
}