133 lines
2.5 KiB
Go
133 lines
2.5 KiB
Go
//go:build darwin || freebsd || openbsd
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/* SPDX-License-Identifier: MIT
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*
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* Copyright (C) 2017-2022 WireGuard LLC. All Rights Reserved.
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*/
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package ipc
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import (
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"errors"
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"net"
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"os"
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"unsafe"
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"golang.org/x/sys/unix"
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)
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type UAPIListener struct {
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listener net.Listener // unix socket listener
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connNew chan net.Conn
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connErr chan error
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kqueueFd int
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keventFd int
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}
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func (l *UAPIListener) Accept() (net.Conn, error) {
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for {
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select {
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case conn := <-l.connNew:
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return conn, nil
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case err := <-l.connErr:
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return nil, err
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}
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}
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}
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func (l *UAPIListener) Close() error {
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err1 := unix.Close(l.kqueueFd)
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err2 := unix.Close(l.keventFd)
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err3 := l.listener.Close()
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if err1 != nil {
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return err1
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}
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if err2 != nil {
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return err2
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}
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return err3
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}
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func (l *UAPIListener) Addr() net.Addr {
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return l.listener.Addr()
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}
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func UAPIListen(name string, file *os.File) (net.Listener, error) {
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// wrap file in listener
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listener, err := net.FileListener(file)
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if err != nil {
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return nil, err
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}
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uapi := &UAPIListener{
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listener: listener,
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connNew: make(chan net.Conn, 1),
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connErr: make(chan error, 1),
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}
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if unixListener, ok := listener.(*net.UnixListener); ok {
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unixListener.SetUnlinkOnClose(true)
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}
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socketPath := sockPath(name)
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// watch for deletion of socket
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uapi.kqueueFd, err = unix.Kqueue()
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if err != nil {
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return nil, err
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}
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uapi.keventFd, err = unix.Open(socketDirectory, unix.O_RDONLY, 0)
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if err != nil {
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unix.Close(uapi.kqueueFd)
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return nil, err
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}
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go func(l *UAPIListener) {
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event := unix.Kevent_t{
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Filter: unix.EVFILT_VNODE,
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Flags: unix.EV_ADD | unix.EV_ENABLE | unix.EV_ONESHOT,
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Fflags: unix.NOTE_WRITE,
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}
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// Allow this assignment to work with both the 32-bit and 64-bit version
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// of the above struct. If you know another way, please submit a patch.
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*(*uintptr)(unsafe.Pointer(&event.Ident)) = uintptr(uapi.keventFd)
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events := make([]unix.Kevent_t, 1)
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n := 1
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var kerr error
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for {
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// start with lstat to avoid race condition
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if _, err := os.Lstat(socketPath); os.IsNotExist(err) {
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l.connErr <- err
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return
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}
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if (kerr != nil || n != 1) && kerr != unix.EINTR {
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if kerr != nil {
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l.connErr <- kerr
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} else {
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l.connErr <- errors.New("kqueue returned empty")
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}
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return
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}
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n, kerr = unix.Kevent(uapi.kqueueFd, []unix.Kevent_t{event}, events, nil)
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}
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}(uapi)
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// watch for new connections
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go func(l *UAPIListener) {
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for {
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conn, err := l.listener.Accept()
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if err != nil {
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l.connErr <- err
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break
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}
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l.connNew <- conn
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}
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}(uapi)
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return uapi, nil
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}
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