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-rw-r--r--tun/tun_darwin.go45
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
}