lib/access/loadaccess.c

	loadaccess.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 1997 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*  Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
/*    All Rights Reserved   */


#pragma ident   "%Z%%M% %I% %E% SMI"    /* SVr4.0 1.9   */
/* EMACS_MODES: !fill, lnumb, !overwrite, !nodelete, !picture */

#include "stdio.h"
#include "errno.h"
#include "string.h"
#include "stdlib.h"

#include "lp.h"
#include "access.h"

static char     **_loadaccess ( char * );

/**
 ** load_userform_access() - LOAD ALLOW/DENY LISTS FOR USER+FORM
 **/

int
load_userform_access(char *form, char ***pallow, char ***pdeny)
{
    return (loadaccess(Lp_A_Forms, form, "", pallow, pdeny));
}

/**
 ** load_userprinter_access() - LOAD ALLOW/DENY LISTS FOR USER+PRINTER
 **/

int
load_userprinter_access(char *printer, char ***pallow, char ***pdeny)
{
    return (loadaccess(Lp_A_Printers, printer, UACCESSPREFIX, pallow,
        pdeny));
}

/**
 ** load_formprinter_access() - LOAD ALLOW/DENY LISTS FOR FORM+PRINTER
 **/

int
load_formprinter_access(char *printer, char ***pallow, char ***pdeny)
{
    return (loadaccess(Lp_A_Printers, printer, FACCESSPREFIX, pallow,
        pdeny));
}

/**
 ** load_paperprinter_access() - LOAD ALLOW/DENY LISTS FOR FORM+PRINTER
 **/

int
load_paperprinter_access(char *printer, char ***pallow, char ***pdeny)
{
    return (loadaccess(Lp_A_Printers, printer, PACCESSPREFIX, pallow,
        pdeny));
}

/**
 ** loadaccess() - LOAD ALLOW OR DENY LISTS
 **/

int
loadaccess(char *dir, char *name, char *prefix, char ***pallow, char ***pdeny)
{
    register char       *allow_file = 0,
                *deny_file  = 0;

    int         ret;

    if (
        !(allow_file = getaccessfile(dir, name, prefix, ALLOWFILE))
         || !(*pallow = _loadaccess(allow_file)) && errno != ENOENT
         || !(deny_file = getaccessfile(dir, name, prefix, DENYFILE))
         || !(*pdeny = _loadaccess(deny_file)) && errno != ENOENT
    )
        ret = -1;
    else
        ret = 0;

    if (allow_file)
        Free (allow_file);
    if (deny_file)
        Free (deny_file);

    return (ret);
}

/**
 ** _loadaccess() - LOAD ALLOW OR DENY FILE
 **/

static char **
_loadaccess(char *file)
{
    register size_t     nalloc,
                nlist;

    register char       **list;

    int fd;

    char            buf[BUFSIZ];


    if ((fd = open_locked(file, "r", 0)) < 0)
        return (0);

    /*
     * Preallocate space for the initial list. We'll always
     * allocate one more than the list size, for the terminating null.
     */
    nalloc = ACC_MAX_GUESS;
    list = (char **)Malloc((nalloc + 1) * sizeof(char *));
    if (!list) {
        close(fd);
        errno = ENOMEM;
        return (0);
    }

    errno = 0;
    for (nlist = 0; fdgets(buf, BUFSIZ, fd); ) {

        buf[strlen(buf) - 1] = 0;

        /*
         * Allocate more space if needed.
         */
        if (nlist >= nalloc) {
            nalloc += ACC_MAX_GUESS;
            list = (char **)Realloc(
                (char *)list,
                (nalloc + 1) * sizeof(char *)
            );
            if (!list) {
                close(fd);
                return (0);
            }
        }

        list[nlist] = Strdup(buf);   /* if fail, minor problem */
        list[++nlist] = 0;

    }
    if (errno != 0) {
        int         save_errno = errno;

        close(fd);
        freelist (list);
        errno = save_errno;
        return (0);
    }
    close(fd);

    /*
     * If we have more space allocated than we need,
     * return the extra.
     */
    if (nlist != nalloc) {
        list = (char **)Realloc(
            (char *)list,
            (nlist + 1) * sizeof(char *)
        );
        if (!list) {
            errno = ENOMEM;
            return (0);
        }
    }
    list[nlist] = 0;

    return (list);
}