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getpass.c

/* Copyright (C) 1992-1998 Free Software Foundation, Inc.
This file is part of the GNU C Library.

The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.

The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
Library General Public License for more details.

You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB.  If
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
Cambridge, MA 02139, USA.  */

/* Modified to use with samba by Jeremy Allison, 8th July 1995. */

#include "replace.h"

#if defined(HAVE_TERMIOS_H)
/* POSIX terminal handling. */
#include <termios.h>
#elif defined(HAVE_TERMIO_H)
/* Older SYSV terminal handling - don't use if we can avoid it. */
#include <termio.h>
#elif defined(HAVE_SYS_TERMIO_H)
/* Older SYSV terminal handling - don't use if we can avoid it. */
#include <sys/termio.h>
#endif

#ifdef HAVE_SYS_WAIT_H
#include <sys/wait.h>
#endif

/*
 * Define additional missing types
 */
#ifndef HAVE_SIG_ATOMIC_T_TYPE
typedef int sig_atomic_t;
#endif

#ifndef SIGCLD
#define SIGCLD SIGCHLD
#endif

#ifndef SIGNAL_CAST
#define SIGNAL_CAST (RETSIGTYPE (*)(int))
#endif

#ifdef REPLACE_GETPASS

#ifdef SYSV_TERMIO 

/* SYSTEM V TERMIO HANDLING */

static struct termio t;

#define ECHO_IS_ON(t) ((t).c_lflag & ECHO)
#define TURN_ECHO_OFF(t) ((t).c_lflag &= ~ECHO)
#define TURN_ECHO_ON(t) ((t).c_lflag |= ECHO)

#ifndef TCSAFLUSH
#define TCSAFLUSH 1
#endif

#ifndef TCSANOW
#define TCSANOW 0
#endif

static int tcgetattr(int fd, struct termio *_t)
{
      return ioctl(fd, TCGETA, _t);
}

static int tcsetattr(int fd, int flags, struct termio *_t)
{
      if(flags & TCSAFLUSH)
            ioctl(fd, TCFLSH, TCIOFLUSH);
      return ioctl(fd, TCSETS, _t);
}

#elif !defined(TCSAFLUSH)

/* BSD TERMIO HANDLING */

static struct sgttyb t;  

#define ECHO_IS_ON(t) ((t).sg_flags & ECHO)
#define TURN_ECHO_OFF(t) ((t).sg_flags &= ~ECHO)
#define TURN_ECHO_ON(t) ((t).sg_flags |= ECHO)

#define TCSAFLUSH 1
#define TCSANOW 0

static int tcgetattr(int fd, struct sgttyb *_t)
{
      return ioctl(fd, TIOCGETP, (char *)_t);
}

static int tcsetattr(int fd, int flags, struct sgttyb *_t)
{
      return ioctl(fd, TIOCSETP, (char *)_t);
}

#else /* POSIX TERMIO HANDLING */
#define ECHO_IS_ON(t) ((t).c_lflag & ECHO)
#define TURN_ECHO_OFF(t) ((t).c_lflag &= ~ECHO)
#define TURN_ECHO_ON(t) ((t).c_lflag |= ECHO)

static struct termios t;
#endif /* SYSV_TERMIO */

static void catch_signal(int signum,void (*handler)(int ))
{
#ifdef HAVE_SIGACTION
      struct sigaction act;
      struct sigaction oldact;

      memset(&act, 0, sizeof(act));

      act.sa_handler = handler;
#ifdef SA_RESTART
      /*
       * We *want* SIGALRM to interrupt a system call.
       */
      if(signum != SIGALRM)
            act.sa_flags = SA_RESTART;
#endif
      sigemptyset(&act.sa_mask);
      sigaddset(&act.sa_mask,signum);
      sigaction(signum,&act,&oldact);
      return oldact.sa_handler;
#else /* !HAVE_SIGACTION */
      /* FIXME: need to handle sigvec and systems with broken signal() */
      return signal(signum, handler);
#endif
}

char *getsmbpass(const char *prompt)
{
  FILE *in, *out;
  int echo_off;
  static char buf[256];
  static size_t bufsize = sizeof(buf);
  size_t nread;

  /* Catch problematic signals */
  catch_signal(SIGINT, SIGNAL_CAST SIG_IGN);

  /* Try to write to and read from the terminal if we can.
     If we can't open the terminal, use stderr and stdin.  */

  in = fopen ("/dev/tty", "w+");
  if (in == NULL)
    {
      in = stdin;
      out = stderr;
    }
  else
    out = in;

  setvbuf(in, NULL, _IONBF, 0);

  /* Turn echoing off if it is on now.  */

  if (tcgetattr (fileno (in), &t) == 0)
    {
        if (ECHO_IS_ON(t))
      {
            TURN_ECHO_OFF(t);
            echo_off = tcsetattr (fileno (in), TCSAFLUSH, &t) == 0;
            TURN_ECHO_ON(t);
      }
      else
      echo_off = 0;
    }
  else
    echo_off = 0;

  /* Write the prompt.  */
  fputs (prompt, out);
  fflush (out);

  /* Read the password.  */
  buf[0] = 0;
  fgets(buf, bufsize, in);
  nread = strlen(buf);
  if (buf[nread - 1] == '\n')
    buf[nread - 1] = '\0';

  /* Restore echoing.  */
  if (echo_off)
    (void) tcsetattr (fileno (in), TCSANOW, &t);

  if (in != stdin)
    /* We opened the terminal; now close it.  */
    fclose (in);

  /* Catch problematic signals */
  catch_signal(SIGINT, SIGNAL_CAST SIG_DFL);

  printf("\n");
  return buf;
}

#else
 void getsmbpasswd_dummy(void);
 void getsmbpasswd_dummy(void) {;}
#endif

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