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/*
* Copyright (c) 1996, 1998-2000 Todd C. Miller <Todd.Miller@courtesan.com>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* 4. Products derived from this software may not be called "Sudo" nor
* may "Sudo" appear in their names without specific prior written
* permission from the author.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
* THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include <stdio.h>
#ifdef STDC_HEADERS
#include <stdlib.h>
#endif /* STDC_HEADERS */
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif /* HAVE_UNISTD_H */
#ifdef HAVE_STRING_H
#include <string.h>
#endif /* HAVE_STRING_H */
#ifdef HAVE_STRINGS_H
#include <strings.h>
#endif /* HAVE_STRINGS_H */
#include <pwd.h>
#include <sys/param.h>
#include <sys/types.h>
#ifdef HAVE_SYS_BSDTYPES_H
#include <sys/bsdtypes.h>
#endif /* HAVE_SYS_BSDTYPES_H */
#ifdef HAVE_SYS_SELECT_H
#include <sys/select.h>
#endif /* HAVE_SYS_SELECT_H */
#include <sys/time.h>
#include <errno.h>
#include <signal.h>
#include <fcntl.h>
#ifdef HAVE_TERMIOS_H
#include <termios.h>
#else
#ifdef HAVE_TERMIO_H
#include <termio.h>
#else
#include <sgtty.h>
#include <sys/ioctl.h>
#endif /* HAVE_TERMIO_H */
#endif /* HAVE_TERMIOS_H */
#include "sudo.h"
#ifndef lint
static const char rcsid[] = "$Sudo: tgetpass.c,v 1.95 2000/02/27 03:48:56 millert Exp $";
#endif /* lint */
#ifndef TCSASOFT
#define TCSASOFT 0
#endif /* TCSASOFT */
/*
* Abstract method of getting at the term flags.
*/
#undef TERM
#undef tflags
#ifdef HAVE_TERMIOS_H
# define TERM termios
# define tflags c_lflag
# define term_getattr(f, t) tcgetattr(f, t)
# define term_setattr(f, t) tcsetattr(f, TCSAFLUSH|TCSASOFT, t)
#else
# ifdef HAVE_TERMIO_H
# define TERM termio
# define tflags c_lflag
# define term_getattr(f, t) ioctl(f, TCGETA, t)
# define term_setattr(f, t) ioctl(f, TCSETA, t)
# else
# define TERM sgttyb
# define tflags sg_flags
# define term_getattr(f, t) ioctl(f, TIOCGETP, t)
# define term_setattr(f, t) ioctl(f, TIOCSETP, t)
# endif /* HAVE_TERMIO_H */
#endif /* HAVE_TERMIOS_H */
static char *tgetline __P((int, char *, size_t, int));
/*
* Like getpass(3) but with timeout and echo flags.
*/
char *
tgetpass(prompt, timeout, flags)
const char *prompt;
int timeout;
int flags;
{
struct TERM term, oterm;
int input, output;
static char buf[SUDO_PASS_MAX + 1];
/* Open /dev/tty for reading/writing if possible else use stdin/stderr. */
if ((flags & TGP_STDIN) ||
(input = output = open(_PATH_TTY, O_RDWR|O_NOCTTY)) == -1) {
input = STDIN_FILENO;
output = STDERR_FILENO;
}
if (prompt)
(void) write(output, prompt, strlen(prompt));
/* Turn echo off/on as specified by flags. */
(void) term_getattr(input, &oterm);
(void) memcpy(&term, &oterm, sizeof(term));
if ((flags & TGP_ECHO) && !(term.tflags & ECHO))
term.tflags |= ECHO;
else if (!(flags & TGP_ECHO) && (term.tflags & ECHO))
term.tflags &= ~ECHO;
(void) term_setattr(input, &term);
buf[0] = '\0';
tgetline(input, buf, sizeof(buf), timeout);
/* Restore old tty flags. */
(void) term_setattr(input, &oterm);
if (!(flags & TGP_ECHO))
(void) write(output, "\n", 1);
if (input != STDIN_FILENO)
(void) close(input);
return(buf);
}
/*
* Get a line of input (optionally timing out) and place it in buf.
*/
static char *
tgetline(fd, buf, bufsiz, timeout)
int fd;
char *buf;
size_t bufsiz;
int timeout;
{
size_t left;
int n;
fd_set *readfds = NULL;
struct timeval tv;
char c;
char *cp;
if (bufsiz == 0)
return(NULL); /* sanity */
cp = buf;
left = bufsiz;
/*
* Timeout of <= 0 means no timeout.
*/
if (timeout > 0) {
/* Setup for select(2) */
n = howmany(fd + 1, NFDBITS) * sizeof(fd_mask);
readfds = (fd_set *) emalloc(n);
(void) memset((VOID *)readfds, 0, n);
/* Set timeout for select */
tv.tv_sec = timeout;
tv.tv_usec = 0;
while (--left) {
FD_SET(fd, readfds);
/* Make sure there is something to read (or timeout) */
while ((n = select(fd + 1, readfds, 0, 0, &tv)) == -1 &&
errno == EINTR)
;
if (n == 0)
return(NULL); /* timeout */
/* Read a character, exit loop on error, EOF or EOL */
n = read(fd, &c, 1);
if (n != 1 || c == '\n' || c == '\r')
break;
*cp++ = c;
}
free(readfds);
} else {
/* Keep reading until out of space, EOF, error, or newline */
while (--left && (n = read(fd, &c, 1)) == 1 && c != '\n' && c != '\r')
*cp++ = c;
}
*cp = '\0';
return(cp == buf ? NULL : buf);
}
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