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      1 /*
      2  * CDDL HEADER START
      3  *
      4  * The contents of this file are subject to the terms of the
      5  * Common Development and Distribution License (the "License").
      6  * You may not use this file except in compliance with the License.
      7  *
      8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
      9  * or http://www.opensolaris.org/os/licensing.
     10  * See the License for the specific language governing permissions
     11  * and limitations under the License.
     12  *
     13  * When distributing Covered Code, include this CDDL HEADER in each
     14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
     15  * If applicable, add the following below this CDDL HEADER, with the
     16  * fields enclosed by brackets "[]" replaced with your own identifying
     17  * information: Portions Copyright [yyyy] [name of copyright owner]
     18  *
     19  * CDDL HEADER END
     20  */
     21 
     22 /*
     23  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
     24  * Use is subject to license terms.
     25  */
     26 
     27 #pragma ident	"%Z%%M%	%I%	%E% SMI"
     28 
     29 #include <unistd.h>
     30 #include <stdlib.h>
     31 #include <string.h>
     32 #include <libgen.h>
     33 #include <attr.h>
     34 #include <fcntl.h>
     35 #include <errno.h>
     36 #include "libcmdutils.h"
     37 
     38 /*
     39  * Returns the status of attempting to obtain the extended system
     40  * attributes in the specified view.
     41  *
     42  * Note: If obtaining status for an extended attribute file, the caller must
     43  * chdir into the hidden directory prior to calling sysattr_status().
     44  *
     45  * Returns 1 if the extended system attributes were obtained, otherwise
     46  * returns 0.
     47  */
     48 int
     49 sysattr_status(char *file, xattr_view_t view)
     50 {
     51 	nvlist_t	*response = NULL;
     52 	int		saveerrno;
     53 	int		status;
     54 
     55 	status = getattrat(AT_FDCWD, view, file, &response);
     56 
     57 	saveerrno = errno;
     58 	if (response)
     59 		(void) nvlist_free(response);
     60 	errno = saveerrno;
     61 
     62 	return (status == 0);
     63 }
     64 
     65 /*
     66  * Returns the type of the specified in file.  If the file name matches
     67  * the name of either a read-only or read-write extended system attribute
     68  * file then sysattr_type() returns the type of file:
     69  * 	return value	file type
     70  *	------------	---------
     71  *	_RO_SATTR	read-only extended system attribute file
     72  *	_RW_SATTR	read-write extended system attribute file
     73  *	_NOT_SATTR	neither a read-only or read-write extended system
     74  *			attribute file.
     75  */
     76 int
     77 sysattr_type(char *file)
     78 {
     79 	if (file == NULL) {
     80 		errno = ENOENT;
     81 		return (_NOT_SATTR);
     82 	}
     83 
     84 	if (strcmp(basename(file), file) != 0) {
     85 		errno = EINVAL;
     86 		return (_NOT_SATTR);
     87 	}
     88 
     89 	errno = 0;
     90 	if (strcmp(file, VIEW_READONLY) == 0) {
     91 		return (_RO_SATTR);
     92 	} else if (strcmp(file, VIEW_READWRITE) == 0) {
     93 		return (_RW_SATTR);
     94 	} else {
     95 		return (_NOT_SATTR);
     96 	}
     97 }
     98 
     99 /*
    100  * Call sysattr_support() instead of pathconf(file, _PC_SATTR_ENABLED) or
    101  * pathconf(file, _PC_SATTR_EXISTS) so that if pathconf() fails over NFS, we
    102  * can still try to figure out if extended system attributes are supported by
    103  * testing for a valid extended system attribute file.
    104  *
    105  * 'name' can have the values _PC_SATTR_ENABLED or _PC_SATTR_EXISTS.
    106  *
    107  * Returns 1 if the underlying file system supports extended system attributes,
    108  * otherwise, returns -1.
    109  */
    110 int
    111 sysattr_support(char *file, int name)
    112 {
    113 	int	rc;
    114 
    115 	errno = 0;
    116 	if ((name != _PC_SATTR_ENABLED) &&
    117 	    (name != _PC_SATTR_EXISTS)) {
    118 		errno = EINVAL;
    119 		return (-1);
    120 	}
    121 	if (((rc = pathconf(file, name)) == 1) || (errno != EINVAL)) {
    122 		return (rc);
    123 	}
    124 	return (sysattr_status(file, XATTR_VIEW_READONLY));
    125 }
    126