tun_darwin.go 2.1 KB

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  1. // +build !ios
  2. package nebula
  3. import (
  4. "fmt"
  5. "net"
  6. "os/exec"
  7. "strconv"
  8. "github.com/songgao/water"
  9. )
  10. type Tun struct {
  11. Device string
  12. Cidr *net.IPNet
  13. MTU int
  14. UnsafeRoutes []route
  15. *water.Interface
  16. }
  17. func newTun(deviceName string, cidr *net.IPNet, defaultMTU int, routes []route, unsafeRoutes []route, txQueueLen int) (ifce *Tun, err error) {
  18. if len(routes) > 0 {
  19. return nil, fmt.Errorf("route MTU not supported in Darwin")
  20. }
  21. // NOTE: You cannot set the deviceName under Darwin, so you must check tun.Device after calling .Activate()
  22. return &Tun{
  23. Cidr: cidr,
  24. MTU: defaultMTU,
  25. UnsafeRoutes: unsafeRoutes,
  26. }, nil
  27. }
  28. func newTunFromFd(deviceFd int, cidr *net.IPNet, defaultMTU int, routes []route, unsafeRoutes []route, txQueueLen int) (ifce *Tun, err error) {
  29. return nil, fmt.Errorf("newTunFromFd not supported in Darwin")
  30. }
  31. func (c *Tun) Activate() error {
  32. var err error
  33. c.Interface, err = water.New(water.Config{
  34. DeviceType: water.TUN,
  35. })
  36. if err != nil {
  37. return fmt.Errorf("activate failed: %v", err)
  38. }
  39. c.Device = c.Interface.Name()
  40. // TODO use syscalls instead of exec.Command
  41. if err = exec.Command("/sbin/ifconfig", c.Device, c.Cidr.String(), c.Cidr.IP.String()).Run(); err != nil {
  42. return fmt.Errorf("failed to run 'ifconfig': %s", err)
  43. }
  44. if err = exec.Command("/sbin/route", "-n", "add", "-net", c.Cidr.String(), "-interface", c.Device).Run(); err != nil {
  45. return fmt.Errorf("failed to run 'route add': %s", err)
  46. }
  47. if err = exec.Command("/sbin/ifconfig", c.Device, "mtu", strconv.Itoa(c.MTU)).Run(); err != nil {
  48. return fmt.Errorf("failed to run 'ifconfig': %s", err)
  49. }
  50. // Unsafe path routes
  51. for _, r := range c.UnsafeRoutes {
  52. if err = exec.Command("/sbin/route", "-n", "add", "-net", r.route.String(), "-interface", c.Device).Run(); err != nil {
  53. return fmt.Errorf("failed to run 'route add' for unsafe_route %s: %s", r.route.String(), err)
  54. }
  55. }
  56. return nil
  57. }
  58. func (c *Tun) CidrNet() *net.IPNet {
  59. return c.Cidr
  60. }
  61. func (c *Tun) DeviceName() string {
  62. return c.Device
  63. }
  64. func (c *Tun) WriteRaw(b []byte) error {
  65. _, err := c.Write(b)
  66. return err
  67. }