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 #include <unistd.h>
28 #include <stdlib.h>
29 #include <string.h>
30 #include <libgen.h>
31 #include <attr.h>
32 #include <fcntl.h>
33 #include <errno.h>
34 #include "libcmdutils.h"
35
36 /*
37 * Returns the status of attempting to obtain the extended system
38 * attributes in the specified view.
39 *
40 * Note: If obtaining status for an extended attribute file, the caller must
41 * chdir into the hidden directory prior to calling sysattr_status().
42 *
43 * Returns 1 if the extended system attributes were obtained, otherwise
44 * returns 0.
45 */
46 int
sysattr_status(char * file,xattr_view_t view)47 sysattr_status(char *file, xattr_view_t view)
48 {
49 nvlist_t *response = NULL;
50 int saveerrno;
51 int status;
52
53 status = getattrat(AT_FDCWD, view, file, &response);
54
55 saveerrno = errno;
56 if (response)
57 (void) nvlist_free(response);
58 errno = saveerrno;
59
60 return (status == 0);
61 }
62
63 /*
64 * Returns the type of the specified in file. If the file name matches
65 * the name of either a read-only or read-write extended system attribute
66 * file then sysattr_type() returns the type of file:
67 * return value file type
68 * ------------ ---------
69 * _RO_SATTR read-only extended system attribute file
70 * _RW_SATTR read-write extended system attribute file
71 * _NOT_SATTR neither a read-only or read-write extended system
72 * attribute file.
73 */
74 int
sysattr_type(char * file)75 sysattr_type(char *file)
76 {
77 if (file == NULL) {
78 errno = ENOENT;
79 return (_NOT_SATTR);
80 }
81
82 if (strcmp(basename(file), file) != 0) {
83 errno = EINVAL;
84 return (_NOT_SATTR);
85 }
86
87 errno = 0;
88 if (strcmp(file, VIEW_READONLY) == 0) {
89 return (_RO_SATTR);
90 } else if (strcmp(file, VIEW_READWRITE) == 0) {
91 return (_RW_SATTR);
92 } else {
93 return (_NOT_SATTR);
94 }
95 }
96
97 /*
98 * Call sysattr_support() instead of pathconf(file, _PC_SATTR_ENABLED) or
99 * pathconf(file, _PC_SATTR_EXISTS) so that if pathconf() fails over NFS, we
100 * can still try to figure out if extended system attributes are supported by
101 * testing for a valid extended system attribute file.
102 *
103 * 'name' can have the values _PC_SATTR_ENABLED or _PC_SATTR_EXISTS.
104 *
105 * Returns 1 if the underlying file system supports extended system attributes,
106 * otherwise, returns -1.
107 */
108 int
sysattr_support(char * file,int name)109 sysattr_support(char *file, int name)
110 {
111 int rc;
112
113 errno = 0;
114 if ((name != _PC_SATTR_ENABLED) &&
115 (name != _PC_SATTR_EXISTS)) {
116 errno = EINVAL;
117 return (-1);
118 }
119 if (((rc = pathconf(file, name)) == 1) || (errno != EINVAL)) {
120 return (rc);
121 }
122 return (sysattr_status(file, XATTR_VIEW_READONLY));
123 }
124