File: __apply_mask_to_mode.c

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acl 2.2.52-3
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/*
  File: __apply_mask_to_mode.c
  (Linux Access Control List Management)

  Copyright (C) 1999-2002
  Andreas Gruenbacher, <a.gruenbacher@bestbits.at>
 	
  This program is free software; you can redistribute it and/or
  modify it under the terms of the GNU Lesser General Public
  License as published by the Free Software Foundation; either
  version 2.1 of the License, or (at your option) any later version.

  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  Lesser General Public License for more details.

  You should have received a copy of the GNU Lesser General Public
  License along with this library; if not, write to the Free Software
  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/

#include <sys/stat.h>
#include <acl/libacl.h>
#include "libacl.h"

#if defined(HAVE_ACL_ENTRIES) && \
    defined (HAVE_ACL_GET_ENTRY) && defined(HAVE_ACL_GET_TAG_TYPE) && \
    defined (HAVE_ACL_GET_PERMSET) && defined(HAVE_ACL_GET_PERM)
int
__apply_mask_to_mode(mode_t *mode, acl_t acl)
{
	acl_entry_t entry;
	int entry_id=ACL_FIRST_ENTRY;

	/* A mimimal ACL which has three entries has no mask entry; the
	   group file mode permission bits are exact. */
	if (acl_entries(acl) == 3)
		return 0;

	while (acl_get_entry(acl, entry_id, &entry) == 1) {
		acl_tag_t tag_type;

		acl_get_tag_type(entry, &tag_type);
		if (tag_type == ACL_MASK) {
			acl_permset_t permset;

			acl_get_permset(entry, &permset);
			if (acl_get_perm(permset, ACL_READ) != 1)
				*mode &= ~S_IRGRP;
			if (acl_get_perm(permset, ACL_WRITE) != 1)
				*mode &= ~S_IWGRP;
			if (acl_get_perm(permset, ACL_EXECUTE) != 1)
				*mode &= ~S_IXGRP;

			return 0;
		}
		entry_id = ACL_NEXT_ENTRY;
	}

	/* This is unexpected; if the ACL didn't include a mask entry
	   we should have exited before the loop! */
	*mode &= ~S_IRWXG;
	return 1;
}
#endif