gen/common/getpass.c

/*
 * 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 1987 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*  Copyright (c) 1984 AT&T */
/*    All Rights Reserved   */


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

/*LINTLIBRARY*/
#include <stdio.h>
#include <signal.h>
#include <termios.h>
#include <unistd.h>

extern void setbuf();
extern int  fclose(FILE *);
extern int  fprintf(FILE *, char *, ...);
extern int  findiop();
extern int ioctl();
static int intrupt;

static void catch(void);

#define MAXPASSWD   8   /* max significant characters in password */

char *
getpass(char *prompt)
{
    struct termios ttyb;
    long flags;
    char *p;
    int c;
    FILE    *fi;
    static char pbuf[ MAXPASSWD + 1 ];
    struct sigvec osv, sv;

    if((fi = fopen("/dev/tty", "r")) == NULL)
#ifdef S5EMUL
        return((char*)NULL);
#else
        fi = stdin;
#endif
    else
        setbuf(fi, (char*)NULL);
    sv.sv_handler = catch;
    sv.sv_mask = 0;
    sv.sv_flags = SV_INTERRUPT;
    (void) sigvec(SIGINT, &sv, &osv);
    intrupt = 0;
    (void) ioctl(fileno(fi), TCGETS, &ttyb);
    flags = ttyb.c_lflag;
    ttyb.c_lflag &= ~(ECHO | ECHOE | ECHOK | ECHONL);
    (void) ioctl(fileno(fi), TCSETSF, &ttyb);
    (void) fputs(prompt, stderr);
    p = pbuf;
    while( !intrupt  &&
        (c = getc(fi)) != '\n'  &&  c != '\r'  &&  c != EOF ) {
        if(p < &pbuf[ MAXPASSWD ])
            *p++ = c;
    }
    *p = '\0';
    ttyb.c_lflag = flags;
    (void) ioctl(fileno(fi), TCSETSW, &ttyb);
    (void) putc('\n', stderr);
    (void) sigvec(SIGINT, &osv, (struct sigvec *)NULL);
    if(fi != stdin)
        (void) fclose(fi);
#ifdef S5EMUL   /* XXX - BOTH versions should probably do this! */
    if(intrupt)
        (void) kill(getpid(), SIGINT);
#endif
    return(pbuf);
}

static void
catch(void)
{
    ++intrupt;
}