From: Pablo Lorenzzoni <spectra@...>
Date: 2002-08-29T06:35:45+09:00
Subject: Re: Stdin Password Reading

Hello!

Thanx. for your tip. You're right! I use Debian GNU/Linux.

[]s

Pablo

Em Qua 28 Ago 2002 07:36, YANAGAWA Kazuhisa escreveu:
| In message <200208272131.SAA41799@server.valenciene>
|
| spectra@debian.org writes:
| > How can I read a password from stdin without showing it (showing stars
| > instead, for instance)? I mean as a login program should do, or as passwd
| > does.
|
| If I can assume you use a Unix like system and it supports termios
| interface, then using termios module like this:
|
|     # get current termios value of $stdin.
|     orig = Termios.getattr($stdin)
|     tios = orig.dup
|
|     # make new value to be set by resetting ECHO and ICANON bit of
|     # local modes: see termios(4).
|     tios.c_lflag &= ~(Termios::ECHO|Termios::ICANON)
|
|     # set new value of termios for $stdin.
|     Termios.setattr($stdin, Termios::TCSANOW, tios)
|
|     begin
|       while c = $stdin.getc  # don't echoing and line buffering
|         p c
|       end
|     ensure
|       # restore original termios state.
|       Termios::setattr($stdin, Termios::TCSANOW, orig)
|     end
|
| # You can use curses extension for this purpose but using it for tiny
| # problem like this is not preferable.
|
|
| Or, use extension library interfacing to getpass(3).... I don't
| remember already that is, but believe writing such extension is not so
| difficult.

-- 
Pablo Lorenzzoni (Spectra) <spectra@debian.org>
GnuPG Key ID 268A084D at search.keyserver.net
Webpage: http://people.debian.org/~spectra/