getpasswd functionality in Go?

Question

Situation:

I want to get a password entry from the stdin console - without echoing what the user types. Is there something com

Answer 1

Here is a version specific to Linux:

func terminalEcho(show bool) {
    // Enable or disable echoing terminal input. This is useful specifically for
    // when users enter passwords.
    // calling terminalEcho(true) turns on echoing (normal mode)
    // calling terminalEcho(false) hides terminal input.
    var termios = &syscall.Termios{}
    var fd = os.Stdout.Fd()

    if _, _, err := syscall.Syscall(syscall.SYS_IOCTL, fd,
        syscall.TCGETS, uintptr(unsafe.Pointer(termios))); err != 0 {
        return
    }

    if show {
        termios.Lflag |= syscall.ECHO
    } else {
        termios.Lflag &^= syscall.ECHO
    }

    if _, _, err := syscall.Syscall(syscall.SYS_IOCTL, fd,
        uintptr(syscall.TCSETS),
        uintptr(unsafe.Pointer(termios))); err != 0 {
        return
    }
}

So to use it:

fmt.Print("password: ")

terminalEcho(false)
var pw string
fmt.Scanln(&pw)
terminalEcho(true)
fmt.Println("")

It's the TCGETS syscall that is linux specific. There are different syscall values for OSX and Windows.