libadm/common/ckuid.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 (c) 1984, 1986, 1987, 1988, 1989 AT&T */
/*    All Rights Reserved   */


/*
 * Copyright (c) 1997, by Sun Microsystems, Inc.
 * All rights reserved.
 */

#pragma ident   "%Z%%M% %I% %E% SMI"    /* SVr4.0 1.2 */
/*LINTLIBRARY*/

#include <sys/types.h>
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <pwd.h>
#include <stdlib.h>
#include <limits.h>
#include "libadm.h"

#define PROMPT  "Enter the login name of an existing user"
#define MESG    "Please enter the login name of an existing user."
#define ALTMESG "Please enter one of the following login names:\\n\\t"
#define MALSIZ  64

#define DELIM1 '/'
#define BLANK ' '

static char *
setmsg(int disp)
{
    struct passwd
        *pwdptr;
    int count;
    size_t  n, m;
    char    *msg;

    if (disp == 0)
        return (MESG);

    m = MALSIZ;
    n = sizeof (ALTMESG);
    msg = (char *) calloc(m, sizeof (char));
    (void) strcpy(msg, ALTMESG);

    setpwent();
    count = 0;
    while (pwdptr = getpwent()) {
        n += strlen(pwdptr->pw_name) + 2;
        while (n >= m) {
            m += MALSIZ;
            msg = (char *) realloc(msg, m*sizeof (char));
        }
        if (count++)
            (void) strcat(msg, ", ");
        (void) strcat(msg, pwdptr->pw_name);
    }
    endpwent();
    return (msg);
}

int
ckuid_dsp(void)
{
    struct passwd *pwdptr;

    /* if display flag is set, then list out passwd file */
    if (ckpwdfile() == 1)
        return (1);
    setpwent();
    while (pwdptr = getpwent())
        (void) printf("%s\n", pwdptr->pw_name);
    endpwent();
    return (0);
}

int
ckuid_val(char *usrnm)
{
    int valid;

    setpwent();
    valid = (getpwnam(usrnm) ? 0 : 1);
    endpwent();
    return (valid);
}

int
ckpwdfile(void) /* check to see if passwd file there */
{
    struct passwd *pwdptr;

    setpwent();
    pwdptr = getpwent();
    if (!pwdptr) {
        endpwent();
        return (1);
    }
    endpwent();
    return (0);
}

void
ckuid_err(short disp, char *error)
{
    char    *msg;

    msg = setmsg(disp);
    puterror(stdout, msg, error);
    if (disp)
        free(msg);
}

void
ckuid_hlp(int disp, char *help)
{
    char    *msg;

    msg = setmsg(disp);
    puthelp(stdout, msg, help);
    if (disp)
        free(msg);
}

int
ckuid(char *uid, short disp, char *defstr, char *error, char *help,
    char *prompt)
{
    char    *defmesg,
        input[MAX_INPUT];

    defmesg = NULL;
    if (!prompt)
        prompt = PROMPT;

start:
    putprmpt(stderr, prompt, NULL, defstr);
    if (getinput(input)) {
        if (disp && defmesg)
            free(defmesg);
        return (1);
    }

    if (!strlen(input)) {
        if (defstr) {
            if (disp && defmesg)
                free(defmesg);
            (void) strcpy(uid, defstr);
            return (0);
        }
        if (!defmesg)
            defmesg = setmsg(disp);
        puterror(stderr, defmesg, error);
        goto start;
    } else if (strcmp(input, "?") == 0) {
        if (!defmesg)
            defmesg = setmsg(disp);
        puthelp(stderr, defmesg, help);
        goto start;
    } else if (ckquit && (strcmp(input, "q") == 0)) {
        if (disp && defmesg)
            free(defmesg);
        return (3);
    } else if (ckuid_val(input)) {
        if (!defmesg)
            defmesg = setmsg(disp);
        puterror(stderr, defmesg, error);
        goto start;
    }
    (void) strcpy(uid, input);
    if (disp && defmesg)
        free(defmesg);
    return (0);
}