Add rwcancelation to darwin
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@ -77,7 +77,7 @@ func (rw *RWCancel) ReadyRead() bool {
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fdset := fdSet{}
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fdset.set(rw.fd)
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fdset.set(closeFd)
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_, err := unix.Select(max(rw.fd, closeFd)+1, &fdset.fdset, nil, nil, nil)
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err := unixSelect(max(rw.fd, closeFd)+1, &fdset.fdset, nil, nil, nil)
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if err != nil {
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return false
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}
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@ -92,7 +92,7 @@ func (rw *RWCancel) ReadyWrite() bool {
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fdset := fdSet{}
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fdset.set(rw.fd)
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fdset.set(closeFd)
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_, err := unix.Select(max(rw.fd, closeFd)+1, nil, &fdset.fdset, nil, nil)
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err := unixSelect(max(rw.fd, closeFd)+1, nil, &fdset.fdset, nil, nil)
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if err != nil {
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return false
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}
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12
rwcancel/select_darwin.go
Normal file
12
rwcancel/select_darwin.go
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@ -0,0 +1,12 @@
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/* SPDX-License-Identifier: GPL-2.0
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*
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* Copyright (C) 2017-2018 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
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*/
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package rwcancel
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import "golang.org/x/sys/unix"
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func unixSelect(nfd int, r *unix.FdSet, w *unix.FdSet, e *unix.FdSet, timeout *unix.Timeval) error {
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return unix.Select(nfd, r, w, e, timeout)
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}
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13
rwcancel/select_linux.go
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13
rwcancel/select_linux.go
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@ -0,0 +1,13 @@
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/* SPDX-License-Identifier: GPL-2.0
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*
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* Copyright (C) 2017-2018 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
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*/
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package rwcancel
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import "golang.org/x/sys/unix"
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func unixSelect(nfd int, r *unix.FdSet, w *unix.FdSet, e *unix.FdSet, timeout *unix.Timeval) (err error) {
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_, err = unix.Select(nfd, r, w, e, timeout)
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return
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}
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@ -6,7 +6,9 @@
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package main
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import (
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"./rwcancel"
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"encoding/binary"
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"errors"
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"fmt"
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"golang.org/x/net/ipv6"
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"golang.org/x/sys/unix"
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@ -34,9 +36,10 @@ type sockaddrCtl struct {
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// NativeTun is a hack to work around the first 4 bytes "packet
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// information" because there doesn't seem to be an IFF_NO_PI for darwin.
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type NativeTun struct {
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name string
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fd *os.File
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mtu int
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name string
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fd *os.File
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rwcancel *rwcancel.RWCancel
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mtu int
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events chan TUNEvent
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errors chan error
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@ -121,6 +124,17 @@ func CreateTUNFromFile(file *os.File) (TUNDevice, error) {
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return nil, err
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}
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// set default MTU
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err = tun.setMTU(DefaultMTU)
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if err != nil {
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return nil, err
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}
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tun.rwcancel, err = rwcancel.NewRWCancel(int(file.Fd()))
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if err != nil {
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return nil, err
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}
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// TODO: Fix this very naive implementation
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go func(tun *NativeTun) {
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var (
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@ -153,10 +167,7 @@ func CreateTUNFromFile(file *os.File) (TUNDevice, error) {
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}
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}(tun)
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// set default MTU
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err = tun.setMTU(DefaultMTU)
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return tun, err
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return tun, nil
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}
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func (tun *NativeTun) Name() (string, error) {
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@ -190,14 +201,30 @@ func (tun *NativeTun) Events() chan TUNEvent {
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return tun.events
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}
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func (tun *NativeTun) Read(buff []byte, offset int) (int, error) {
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buff = buff[offset-4:]
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n, err := tun.fd.Read(buff[:])
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if n < 4 {
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func (tun *NativeTun) doRead(buff []byte, offset int) (int, error) {
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select {
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case err := <-tun.errors:
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return 0, err
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default:
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buff := buff[offset-4:]
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n, err := tun.fd.Read(buff[:])
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if n < 4 {
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return 0, err
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}
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return n - 4, err
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}
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}
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func (tun *NativeTun) Read(buff []byte, offset int) (int, error) {
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for {
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n, err := tun.doRead(buff, offset)
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if err == nil || !rwcancel.ErrorIsEAGAIN(err) {
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return n, err
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}
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if !tun.rwcancel.ReadyRead() {
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return 0, errors.New("tun device closed")
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}
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}
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return n - 4, err
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}
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func (tun *NativeTun) Write(buff []byte, offset int) (int, error) {
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@ -224,9 +251,13 @@ func (tun *NativeTun) Write(buff []byte, offset int) (int, error) {
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}
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func (tun *NativeTun) Close() error {
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err := tun.fd.Close()
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err1 := tun.rwcancel.Cancel()
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err2 := tun.fd.Close()
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close(tun.events)
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return err
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if err1 != nil {
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return err1
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}
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return err2
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}
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func (tun *NativeTun) setMTU(n int) error {
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