port/stdio/getpass.c

	getpass.c revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#pragma ident   "%Z%%M% %I% %E% SMI"

/*  Copyright (c) 1988 AT&T */
/*    All Rights Reserved   */


#pragma weak getpass = _getpass
#pragma weak getpassphrase = _getpassphrase

#include "synonyms.h"
#include "file64.h"
#include "mtlib.h"
#include <stdio.h>
#include <sys/types.h>
#include <signal.h>
#include <unistd.h>
#include <stropts.h>
#include <termio.h>
#include <thread.h>
#include <synch.h>
#include "libc.h"
#include "stdiom.h"
#include "tsd.h"

static void catch(int);
static int intrupt;
static char *__getpass(const char *, int);

#define MAXPASSWD   256 /* max significant characters in password */
#define SMLPASSWD   8   /* unix standard  characters in password */


char *
getpass(const char *prompt)
{
    return ((char *)__getpass(prompt, SMLPASSWD));
}

char *
getpassphrase(const char *prompt)
{
    return ((char *)__getpass(prompt, MAXPASSWD));
}

static char *
__getpass(const char *prompt, int size)
{
    struct termio ttyb;
    unsigned short flags;
    char *p;
    int c;
    FILE    *fi;
    char *pbuf = tsdalloc(_T_GETPASS, MAXPASSWD + 1, NULL);
    void    (*sig)(int);
    rmutex_t *lk;

    if (pbuf == NULL ||
        (fi = fopen("/dev/tty", "r")) == NULL)
        return (NULL);
    setbuf(fi, NULL);
    sig = signal(SIGINT, catch);
    intrupt = 0;
    (void) ioctl(FILENO(fi), TCGETA, &ttyb);
    flags = ttyb.c_lflag;
    ttyb.c_lflag &= ~(ECHO | ECHOE | ECHOK | ECHONL);
    (void) ioctl(FILENO(fi), TCSETAF, &ttyb);
    FLOCKFILE(lk, stderr);
    (void) fputs(prompt, stderr);
    p = pbuf;
    while (!intrupt &&
        (c = GETC(fi)) != '\n' && c != '\r' && c != EOF) {
        if (p < &pbuf[ size ])
            *p++ = (char)c;
    }
    *p = '\0';
    ttyb.c_lflag = flags;
    (void) ioctl(FILENO(fi), TCSETAW, &ttyb);
    (void) PUTC('\n', stderr);
    FUNLOCKFILE(lk);
    (void) signal(SIGINT, sig);
    (void) fclose(fi);
    if (intrupt)
        (void) kill(getpid(), SIGINT);
    return (pbuf);
}

/* ARGSUSED */
static void
catch(int x)
{
    intrupt = 1;
}