Exemplo n.º 1
0
// ReadPassword reads a line of input from a terminal without local echo.  This
// is commonly used for inputting passwords and other sensitive data. The slice
// returned does not include the \n.
// see also: http://src.illumos.org/source/xref/illumos-gate/usr/src/lib/libast/common/uwin/getpass.c
func ReadPassword(fd int) ([]byte, error) {
	val, err := unix.IoctlGetTermios(fd, unix.TCGETS)
	if err != nil {
		return nil, err
	}
	oldState := *val

	newState := oldState
	newState.Lflag &^= syscall.ECHO
	newState.Lflag |= syscall.ICANON | syscall.ISIG
	newState.Iflag |= syscall.ICRNL
	err = unix.IoctlSetTermios(fd, unix.TCSETS, &newState)
	if err != nil {
		return nil, err
	}

	// XXX what about resetting the terminal after a signal like Control-C?
	// XXX or is ISIG sufficient?
	defer func() {
		unix.IoctlSetTermios(fd, unix.TCSETS, &oldState)
	}()

	var buf [16]byte
	var ret []byte
	for {
		n, err := syscall.Read(fd, buf[:])
		if err != nil {
			return nil, err
		}
		if n == 0 {
			if len(ret) == 0 {
				return nil, io.EOF
			}
			break
		}
		if buf[n-1] == '\n' {
			n--
		}
		ret = append(ret, buf[:n]...)
		if n < len(buf) {
			break
		}
	}

	return ret, nil
}
Exemplo n.º 2
0
// ReadPassword reads a line of input from a terminal without local echo.  This
// is commonly used for inputting passwords and other sensitive data. The slice
// returned does not include the \n.
func ReadPassword(fd int) ([]byte, error) {
	// see also: http://src.illumos.org/source/xref/illumos-gate/usr/src/lib/libast/common/uwin/getpass.c
	val, err := unix.IoctlGetTermios(fd, unix.TCGETS)
	if err != nil {
		return nil, err
	}
	oldState := *val

	newState := oldState
	newState.Lflag &^= syscall.ECHO
	newState.Lflag |= syscall.ICANON | syscall.ISIG
	newState.Iflag |= syscall.ICRNL
	err = unix.IoctlSetTermios(fd, unix.TCSETS, &newState)
	if err != nil {
		return nil, err
	}

	defer unix.IoctlSetTermios(fd, unix.TCSETS, &oldState)

	var buf [16]byte
	var ret []byte
	for {
		n, err := syscall.Read(fd, buf[:])
		if err != nil {
			return nil, err
		}
		if n == 0 {
			if len(ret) == 0 {
				return nil, io.EOF
			}
			break
		}
		if buf[n-1] == '\n' {
			n--
		}
		ret = append(ret, buf[:n]...)
		if n < len(buf) {
			break
		}
	}

	return ret, nil
}
Exemplo n.º 3
0
func read(f *os.File) (string, error) {
	fd := int(f.Fd())
	if !isTerminal(fd) {
		return "", fmt.Errorf("File descriptor %d is not a terminal", fd)
	}

	oldState, err := makeRaw(fd)
	if err != nil {
		return "", err
	}
	defer unix.IoctlSetTermios(fd, unix.TCSETS, oldState)

	return readline(f)
}
Exemplo n.º 4
0
// makeRaw puts the terminal connected to the given file descriptor into raw
// mode and returns the previous state of the terminal so that it can be
// restored.
// Source: http://src.illumos.org/source/xref/illumos-gate/usr/src/lib/libast/common/uwin/getpass.c
func makeRaw(fd int) (*unix.Termios, error) {
	oldTermiosPtr, err := unix.IoctlGetTermios(int(fd), unix.TCGETS)
	if err != nil {
		return nil, err
	}
	oldTermios := *oldTermiosPtr

	newTermios := oldTermios
	newTermios.Lflag &^= syscall.ECHO | syscall.ECHOE | syscall.ECHOK | syscall.ECHONL
	if err := unix.IoctlSetTermios(fd, unix.TCSETS, &newTermios); err != nil {
		return nil, err
	}

	return oldTermiosPtr, nil
}
Exemplo n.º 5
0
// makeRaw puts the terminal connected to the given file descriptor into raw
// mode and returns the previous state of the terminal so that it can be
// restored.
// Source: http://src.illumos.org/source/xref/illumos-gate/usr/src/lib/libast/common/uwin/getpass.c
func makeRaw(fd uintptr) (*terminalState, error) {
	oldTermiosPtr, err := unix.IoctlGetTermios(int(fd), unix.TCGETS)
	if err != nil {
		return nil, err
	}
	oldTermios := *oldTermiosPtr

	newTermios := oldTermios
	newTermios.Lflag &^= syscall.ECHO | syscall.ECHOE | syscall.ECHOK | syscall.ECHONL
	if err := unix.IoctlSetTermios(int(fd), unix.TCSETS, &newTermios); err != nil {
		return nil, err
	}

	return &terminalState{
		state: oldTermiosPtr,
	}, nil
}
Exemplo n.º 6
0
func restore(fd uintptr, oldState *terminalState) error {
	return unix.IoctlSetTermios(int(fd), unix.TCSETS, oldState.state)
}
Exemplo n.º 7
0
// Tcsetattr sets the current serial port settings.
func Tcsetattr(fd, action uintptr, argp *syscall.Termios) error {
	return unix.IoctlSetTermios(int(fd), int(action), (*unix.Termios)(argp))
}