118 lines
2.2 KiB
Go
118 lines
2.2 KiB
Go
// +build ios
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package nebula
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import (
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"errors"
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"fmt"
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"io"
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"net"
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"os"
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"sync"
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"syscall"
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)
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type Tun struct {
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io.ReadWriteCloser
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Device string
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Cidr *net.IPNet
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}
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func newTun(deviceName string, cidr *net.IPNet, defaultMTU int, routes []route, unsafeRoutes []route, txQueueLen int, multiqueue bool) (ifce *Tun, err error) {
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return nil, fmt.Errorf("newTun not supported in iOS")
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}
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func newTunFromFd(deviceFd int, cidr *net.IPNet, defaultMTU int, routes []route, unsafeRoutes []route, txQueueLen int) (ifce *Tun, err error) {
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if len(routes) > 0 {
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return nil, fmt.Errorf("route MTU not supported in Darwin")
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}
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file := os.NewFile(uintptr(deviceFd), "/dev/tun")
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ifce = &Tun{
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Cidr: cidr,
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Device: "iOS",
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ReadWriteCloser: &tunReadCloser{f: file},
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}
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return
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}
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func (c *Tun) Activate() error {
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return nil
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}
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func (c *Tun) WriteRaw(b []byte) error {
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_, err := c.Write(b)
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return err
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}
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// The following is hoisted up from water, we do this so we can inject our own fd on iOS
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type tunReadCloser struct {
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f io.ReadWriteCloser
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rMu sync.Mutex
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rBuf []byte
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wMu sync.Mutex
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wBuf []byte
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}
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func (t *tunReadCloser) Read(to []byte) (int, error) {
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t.rMu.Lock()
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defer t.rMu.Unlock()
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if cap(t.rBuf) < len(to)+4 {
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t.rBuf = make([]byte, len(to)+4)
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}
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t.rBuf = t.rBuf[:len(to)+4]
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n, err := t.f.Read(t.rBuf)
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copy(to, t.rBuf[4:])
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return n - 4, err
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}
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func (t *tunReadCloser) Write(from []byte) (int, error) {
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if len(from) == 0 {
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return 0, syscall.EIO
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}
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t.wMu.Lock()
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defer t.wMu.Unlock()
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if cap(t.wBuf) < len(from)+4 {
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t.wBuf = make([]byte, len(from)+4)
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}
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t.wBuf = t.wBuf[:len(from)+4]
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// Determine the IP Family for the NULL L2 Header
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ipVer := from[0] >> 4
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if ipVer == 4 {
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t.wBuf[3] = syscall.AF_INET
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} else if ipVer == 6 {
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t.wBuf[3] = syscall.AF_INET6
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} else {
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return 0, errors.New("unable to determine IP version from packet")
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}
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copy(t.wBuf[4:], from)
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n, err := t.f.Write(t.wBuf)
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return n - 4, err
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}
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func (t *tunReadCloser) Close() error {
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return t.f.Close()
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}
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func (c *Tun) CidrNet() *net.IPNet {
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return c.Cidr
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}
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func (c *Tun) DeviceName() string {
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return c.Device
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}
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func (t *Tun) NewMultiQueueReader() (io.ReadWriteCloser, error) {
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return nil, fmt.Errorf("TODO: multiqueue not implemented for ios")
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}
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