diff options
| -rw-r--r-- | tun/tun_darwin.go | 45 |
1 files changed, 10 insertions, 35 deletions
diff --git a/tun/tun_darwin.go b/tun/tun_darwin.go index c30e733..54021c5 100644 --- a/tun/tun_darwin.go +++ b/tun/tun_darwin.go @@ -298,11 +298,6 @@ func (tun *NativeTun) Close() error { } func (tun *NativeTun) setMTU(n int) error { - - // open datagram socket - - var fd int - fd, err := unix.Socket( unix.AF_INET, unix.SOCK_DGRAM, @@ -315,29 +310,18 @@ func (tun *NativeTun) setMTU(n int) error { defer unix.Close(fd) - // do ioctl call - - var ifr [32]byte - copy(ifr[:], tun.name) - *(*uint32)(unsafe.Pointer(&ifr[unix.IFNAMSIZ])) = uint32(n) - _, _, errno := unix.Syscall( - unix.SYS_IOCTL, - uintptr(fd), - uintptr(unix.SIOCSIFMTU), - uintptr(unsafe.Pointer(&ifr[0])), - ) - - if errno != 0 { - return fmt.Errorf("failed to set MTU on %s", tun.name) + var ifr unix.IfreqMTU + copy(ifr.Name[:], tun.name) + ifr.MTU = int32(n) + err = unix.IoctlSetIfreqMTU(fd, &ifr) + if err != nil { + return fmt.Errorf("failed to set MTU on %s: %w", tun.name, err) } return nil } func (tun *NativeTun) MTU() (int, error) { - - // open datagram socket - fd, err := unix.Socket( unix.AF_INET, unix.SOCK_DGRAM, @@ -350,19 +334,10 @@ func (tun *NativeTun) MTU() (int, error) { defer unix.Close(fd) - // do ioctl call - - var ifr [64]byte - copy(ifr[:], tun.name) - _, _, errno := unix.Syscall( - unix.SYS_IOCTL, - uintptr(fd), - uintptr(unix.SIOCGIFMTU), - uintptr(unsafe.Pointer(&ifr[0])), - ) - if errno != 0 { - return 0, fmt.Errorf("failed to get MTU on %s", tun.name) + ifr, err := unix.IoctlGetIfreqMTU(fd, tun.name) + if err != nil { + return 0, fmt.Errorf("failed to get MTU on %s: %w", tun.name, err) } - return int(*(*int32)(unsafe.Pointer(&ifr[16]))), nil + return int(ifr.MTU), nil } |