sudo/getpass.c

#ifdef BROKEN_GETPASS
/*
 * Copyright (c) 1988 The Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms are permitted
 * provided that the above copyright notice and this paragraph are
 * duplicated in all such forms and that any documentation,
 * advertising materials, and other materials related to such
 * distribution and use acknowledge that the software was developed
 * by the University of California, Berkeley.  The name of the
 * University may not be used to endorse or promote products derived
 * from this software without specific prior written permission.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */

/*
 * This version of getpass() is known to work under Ultrix 4.2/4.3, 4.3 BSD,
 * HP-UX 8.07, AIX 3.1/3.2, and Irix 4.05F.  It should be easy to change it
 * to suit your tty interface.  There's no support for POSIX termios here
 * but it should be trivial to add.
 */

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)getpass.c	based on 5.3 (Berkeley) 9/22/88";
#endif				/* LIBC_SCCS and not lint */

#include "config.h"

#include <fcntl.h>
#ifdef HAVE_TERMIO_H
#include <termio.h>
#else
#include <sgtty.h>
#endif
#include <sys/ioctl.h>
#include <sys/signal.h>
#include <stdio.h>

char *
    getpass(prompt)
    char *prompt;
{
#ifdef HAVE_TERMIO_H
    struct termio ttyb;
#else
    struct sgttyb ttyb;
#endif
    register int ch;
    register char *p;
    FILE *fp, *outfp;
    long omask;
    int fd_tmp;
#ifdef HAVE_TERMIO_H
    tcflag_t svflagval;
#else
    int svflagval;
#endif
#define	PASSWD_LEN	8
    static char buf[PASSWD_LEN + 1];

    /*
     * read and write to /dev/tty if possible; else read from stdin and write
     * to stderr. 
     */
    fd_tmp = open("/dev/tty", O_RDWR);
    if (fd_tmp < 0 || (outfp = fp = fdopen(fd_tmp, "r+")) == NULL) {
	outfp = stderr;
	fp = stdin;
    }
#ifdef HAVE_TERMIO_H
    (void) ioctl(fileno(fp), TCGETA, &ttyb);
    svflagval = ttyb.c_lflag;
    ttyb.c_lflag &= ~ECHO;
    omask = sigblock(sigmask(SIGINT));
    (void) ioctl(fileno(fp), TCSETA, &ttyb);
#else
    (void) ioctl(fileno(fp), TIOCGETP, &ttyb);
    svflagval = ttyb.sg_flags;
    ttyb.sg_flags &= ~ECHO;
    omask = sigblock(sigmask(SIGINT));
    (void) ioctl(fileno(fp), TIOCSETP, &ttyb);
#endif

    (void) fprintf(outfp, "%s", prompt);
    rewind(outfp);		/* implied flush */
    for (p = buf; (ch = getc(fp)) != EOF && ch != '\n';)
	if (p < buf + PASSWD_LEN)
	    *p++ = ch;
    *p = '\0';
    (void) write(fileno(outfp), "\n", 1);

#ifdef HAVE_TERMIO_H
    ttyb.c_lflag = svflagval;
    (void) ioctl(fileno(fp), TCSETA, &ttyb);
#else
    ttyb.sg_flags = svflagval;
    (void) ioctl(fileno(fp), TIOCSETP, &ttyb);
#endif
    (void) sigsetmask(omask);
    if (fp != stdin)
	(void) fclose(fp);
    return (buf);
}
#endif