/*-
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * Copyright (c) 2001 Chris D. Faulhaber
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/types.h>
#include <sys/acl.h>
#include <sys/stat.h>

#include <err.h>

#include "setfacl.h"

/*
 * remove ACL entries from an ACL
 */
int
remove_acl(acl_t acl, acl_t *prev_acl, const char *filename)
{
        acl_entry_t     entry;
        acl_t           acl_new;
        acl_tag_t       tag;
        int             carried_error, entry_id, acl_brand, prev_acl_brand;

        carried_error = 0;

        acl_get_brand_np(acl, &acl_brand);
        acl_get_brand_np(*prev_acl, &prev_acl_brand);

        if (branding_mismatch(acl_brand, prev_acl_brand)) {
                warnx("%s: branding mismatch; existing ACL is %s, "
                    "entry to be removed is %s", filename,
                    brand_name(prev_acl_brand), brand_name(acl_brand));
                return (-1);
        }

        carried_error = 0;

        acl_new = acl_dup(*prev_acl);
        if (acl_new == NULL)
                err(1, "%s: acl_dup() failed", filename);

        tag = ACL_UNDEFINED_TAG;

        /* find and delete the entry */
        entry_id = ACL_FIRST_ENTRY;
        while (acl_get_entry(acl, entry_id, &entry) == 1) {
                entry_id = ACL_NEXT_ENTRY;
                if (acl_get_tag_type(entry, &tag) == -1)
                        err(1, "%s: acl_get_tag_type() failed", filename);
                if (tag == ACL_MASK)
                        have_mask = true;
                if (acl_delete_entry(acl_new, entry) == -1) {
                        carried_error++;
                        warnx("%s: cannot remove non-existent ACL entry",
                            filename);
                }
        }

        acl_free(*prev_acl);
        *prev_acl = acl_new;

        if (carried_error)
                return (-1);

        return (0);
}

int
remove_by_number(uint entry_number, acl_t *prev_acl, const char *filename)
{
        acl_entry_t     entry;
        acl_t           acl_new;
        acl_tag_t       tag;
        int             carried_error, entry_id;
        uint            i;

        carried_error = 0;

        acl_new = acl_dup(*prev_acl);
        if (acl_new == NULL)
                err(1, "%s: acl_dup() failed", filename);

        tag = ACL_UNDEFINED_TAG;

        /*
         * Find out whether we're removing the mask entry,
         * to behave the same as the routine above.
         *
         * XXX: Is this loop actually needed?
         */
        entry_id = ACL_FIRST_ENTRY;
        i = 0;
        while (acl_get_entry(acl_new, entry_id, &entry) == 1) {
                entry_id = ACL_NEXT_ENTRY;
                if (i != entry_number)
                        continue;
                if (acl_get_tag_type(entry, &tag) == -1)
                        err(1, "%s: acl_get_tag_type() failed", filename);
                if (tag == ACL_MASK)
                        have_mask = true;
        }

        if (acl_delete_entry_np(acl_new, entry_number) == -1) {
                carried_error++;
                warn("%s: acl_delete_entry_np() failed", filename);
        }

        acl_free(*prev_acl);
        *prev_acl = acl_new;

        if (carried_error)
                return (-1);

        return (0);
}

/*
 * remove default entries
 */
int
remove_default(acl_t *prev_acl, const char *filename)
{

        acl_free(*prev_acl);
        *prev_acl = acl_init(ACL_MAX_ENTRIES);
        if (*prev_acl == NULL)
                err(1, "%s: acl_init() failed", filename);

        return (0);
}

/*
 * remove extended entries
 */
void
remove_ext(acl_t *prev_acl, const char *filename)
{
        acl_t acl_new;

        acl_new = acl_strip_np(*prev_acl, !n_flag);
        if (acl_new == NULL)
                err(1, "%s: acl_strip_np() failed", filename);

        acl_free(*prev_acl);
        *prev_acl = acl_new;
}