package main import ( "errors" "fmt" "golang.org/x/sys/unix" "net" "os" "path" "time" ) const ( ipcErrorIO = int64(unix.EIO) ipcErrorNoPeer = int64(unix.EPROTO) ipcErrorNoKeyValue = int64(unix.EPROTO) ipcErrorInvalidKey = int64(unix.EPROTO) ipcErrorInvalidValue = int64(unix.EPROTO) socketDirectory = "/var/run/wireguard" socketName = "%s.sock" ) /* TODO: * This code can be improved by using fsnotify once: * https://github.com/fsnotify/fsnotify/pull/205 * Is merged */ type UAPIListener struct { listener net.Listener // unix socket listener connNew chan net.Conn connErr chan error } func (l *UAPIListener) Accept() (net.Conn, error) { for { select { case conn := <-l.connNew: return conn, nil case err := <-l.connErr: return nil, err } } } func (l *UAPIListener) Close() error { return l.listener.Close() } func (l *UAPIListener) Addr() net.Addr { return nil } func connectUnixSocket(path string) (net.Listener, error) { // attempt inital connection listener, err := net.Listen("unix", path) if err == nil { return listener, nil } // check if active _, err = net.Dial("unix", path) if err == nil { return nil, errors.New("Unix socket in use") } // attempt cleanup err = os.Remove(path) if err != nil { return nil, err } return net.Listen("unix", path) } func NewUAPIListener(name string) (net.Listener, error) { // check if path exist err := os.MkdirAll(socketDirectory, 077) if err != nil && !os.IsExist(err) { return nil, err } // open UNIX socket socketPath := path.Join( socketDirectory, fmt.Sprintf(socketName, name), ) listener, err := connectUnixSocket(socketPath) if err != nil { return nil, err } uapi := &UAPIListener{ listener: listener, connNew: make(chan net.Conn, 1), connErr: make(chan error, 1), } // watch for deletion of socket go func(l *UAPIListener) { for ; ; time.Sleep(time.Second) { if _, err := os.Stat(socketPath); os.IsNotExist(err) { l.connErr <- err return } } }(uapi) // watch for new connections go func(l *UAPIListener) { for { conn, err := l.listener.Accept() if err != nil { l.connErr <- err break } l.connNew <- conn } }(uapi) return uapi, nil }