tun

Documentation

Index

• Constants
• Variables
• type Device
  • func CreateTUN(ifname string, mtu int) (Device, error)
  • func CreateTUNWithRequestedGUID(ifname string, requestedGUID *windows.GUID, mtu int) (Device, error)
• type Event
• type NativeTun
  • func (tun *NativeTun) BatchSize() int
  • func (tun *NativeTun) Close() error
  • func (tun *NativeTun) Events() <-chan Event
  • func (tun *NativeTun) File() *os.File
  • func (tun *NativeTun) ForceMTU(mtu int)
  • func (tun *NativeTun) LUID() uint64
  • func (tun *NativeTun) MTU() (int, error)
  • func (tun *NativeTun) Name() (string, error)
  • func (tun *NativeTun) Read(bufs [][]byte, sizes []int, offset int) (int, error)
  • func (tun *NativeTun) RunningVersion() (version uint32, err error)
  • func (tun *NativeTun) Write(bufs [][]byte, offset int) (int, error)

Constants

const (
	EventUp = 1 << iota
	EventDown
	EventMTUUpdate
)

Variables

var (
	WintunTunnelType          = "WireGuard"
	WintunStaticRequestedGUID *windows.GUID
)

var (
	// ErrTooManySegments is returned by Device.Read() when segmentation
	// overflows the length of supplied buffers. This error should not cause
	// reads to cease.
	ErrTooManySegments = errors.New("too many segments")
)

Types

type Device

type Device interface {
	// File returns the file descriptor of the device.
	File() *os.File

	// Read one or more packets from the Device (without any additional headers).
	// On a successful read it returns the number of packets read, and sets
	// packet lengths within the sizes slice. len(sizes) must be >= len(bufs).
	// A nonzero offset can be used to instruct the Device on where to begin
	// reading into each element of the bufs slice.
	Read(bufs [][]byte, sizes []int, offset int) (n int, err error)

	// Write one or more packets to the device (without any additional headers).
	// On a successful write it returns the number of packets written. A nonzero
	// offset can be used to instruct the Device on where to begin writing from
	// each packet contained within the bufs slice.
	Write(bufs [][]byte, offset int) (int, error)

	// MTU returns the MTU of the Device.
	MTU() (int, error)

	// Name returns the current name of the Device.
	Name() (string, error)

	// Events returns a channel of type Event, which is fed Device events.
	Events() <-chan Event

	// Close stops the Device and closes the Event channel.
	Close() error

	// BatchSize returns the preferred/max number of packets that can be read or
	// written in a single read/write call. BatchSize must not change over the
	// lifetime of a Device.
	BatchSize() int
}

func CreateTUN

func CreateTUN(ifname string, mtu int) (Device, error)

CreateTUN creates a Wintun interface with the given name. Should a Wintun interface with the same name exist, it is reused.

func CreateTUNWithRequestedGUID

func CreateTUNWithRequestedGUID(ifname string, requestedGUID *windows.GUID, mtu int) (Device, error)

CreateTUNWithRequestedGUID creates a Wintun interface with the given name and a requested GUID. Should a Wintun interface with the same name exist, it is reused.

type Event

type Event int

type NativeTun

type NativeTun struct {
	// contains filtered or unexported fields
}

func (*NativeTun) BatchSize

func (tun *NativeTun) BatchSize() int

func (*NativeTun) Close

func (tun *NativeTun) Close() error

func (*NativeTun) Events

func (tun *NativeTun) Events() <-chan Event

func (*NativeTun) File

func (tun *NativeTun) File() *os.File

func (*NativeTun) ForceMTU

func (tun *NativeTun) ForceMTU(mtu int)

TODO: This is a temporary hack. We really need to be monitoring the interface in real time and adapting to MTU changes.

func (*NativeTun) LUID

func (tun *NativeTun) LUID() uint64

LUID returns Windows interface instance ID.

func (*NativeTun) MTU

func (tun *NativeTun) MTU() (int, error)

func (*NativeTun) Name

func (tun *NativeTun) Name() (string, error)

func (*NativeTun) Read

func (tun *NativeTun) Read(bufs [][]byte, sizes []int, offset int) (int, error)

func (*NativeTun) RunningVersion

func (tun *NativeTun) RunningVersion() (version uint32, err error)

RunningVersion returns the running version of the Wintun driver.

func (*NativeTun) Write

func (tun *NativeTun) Write(bufs [][]byte, offset int) (int, error)