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 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 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 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