1 /*
2 Unix SMB/CIFS implementation.
3
4 POSIX NTVFS backend - xattr support using filesystem xattrs
5
6 Copyright (C) Andrew Tridgell 2004
7
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
12
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21 */
22
23 #include "includes.h"
24 #include "vfs_posix.h"
25 #include "lib/util/wrap_xattr.h"
26
27 /*
28 pull a xattr as a blob, from either a file or a file descriptor
29 */
pull_xattr_blob_system(struct pvfs_state * pvfs,TALLOC_CTX * mem_ctx,const char * attr_name,const char * fname,int fd,size_t estimated_size,DATA_BLOB * blob)30 NTSTATUS pull_xattr_blob_system(struct pvfs_state *pvfs,
31 TALLOC_CTX *mem_ctx,
32 const char *attr_name,
33 const char *fname,
34 int fd,
35 size_t estimated_size,
36 DATA_BLOB *blob)
37 {
38 int ret;
39
40 *blob = data_blob_talloc(mem_ctx, NULL, estimated_size+16);
41 if (blob->data == NULL) {
42 return NT_STATUS_NO_MEMORY;
43 }
44
45 again:
46 if (fd != -1) {
47 ret = wrap_fgetxattr(fd, attr_name, blob->data, estimated_size);
48 } else {
49 ret = wrap_getxattr(fname, attr_name, blob->data, estimated_size);
50 }
51 if (ret == -1 && errno == ERANGE) {
52 estimated_size *= 2;
53 blob->data = talloc_realloc(mem_ctx, blob->data,
54 uint8_t, estimated_size);
55 if (blob->data == NULL) {
56 return NT_STATUS_NO_MEMORY;
57 }
58 blob->length = estimated_size;
59 goto again;
60 }
61 if (ret == -1 && errno == EPERM) {
62 struct stat statbuf;
63
64 if (fd != -1) {
65 ret = fstat(fd, &statbuf);
66 } else {
67 ret = stat(fname, &statbuf);
68 }
69 if (ret == 0) {
70 /* check if this is a directory and the sticky bit is set */
71 if (S_ISDIR(statbuf.st_mode) && (statbuf.st_mode & S_ISVTX)) {
72 /* pretend we could not find the xattr */
73
74 data_blob_free(blob);
75 return NT_STATUS_NOT_FOUND;
76
77 } else {
78 /* if not this was probably a legittimate error
79 * reset ret and errno to the correct values */
80 errno = EPERM;
81 ret = -1;
82 }
83 }
84 }
85
86 if (ret == -1) {
87 data_blob_free(blob);
88 return pvfs_map_errno(pvfs, errno);
89 }
90
91 blob->length = ret;
92
93 return NT_STATUS_OK;
94 }
95
96 /*
97 push a xattr as a blob, from either a file or a file descriptor
98 */
push_xattr_blob_system(struct pvfs_state * pvfs,const char * attr_name,const char * fname,int fd,const DATA_BLOB * blob)99 NTSTATUS push_xattr_blob_system(struct pvfs_state *pvfs,
100 const char *attr_name,
101 const char *fname,
102 int fd,
103 const DATA_BLOB *blob)
104 {
105 int ret;
106
107 if (fd != -1) {
108 ret = wrap_fsetxattr(fd, attr_name, blob->data, blob->length, 0);
109 } else {
110 ret = wrap_setxattr(fname, attr_name, blob->data, blob->length, 0);
111 }
112 if (ret == -1) {
113 return pvfs_map_errno(pvfs, errno);
114 }
115
116 return NT_STATUS_OK;
117 }
118
119
120 /*
121 delete a xattr
122 */
delete_xattr_system(struct pvfs_state * pvfs,const char * attr_name,const char * fname,int fd)123 NTSTATUS delete_xattr_system(struct pvfs_state *pvfs, const char *attr_name,
124 const char *fname, int fd)
125 {
126 int ret;
127
128 if (fd != -1) {
129 ret = wrap_fremovexattr(fd, attr_name);
130 } else {
131 ret = wrap_removexattr(fname, attr_name);
132 }
133 if (ret == -1) {
134 return pvfs_map_errno(pvfs, errno);
135 }
136
137 return NT_STATUS_OK;
138 }
139
140 /*
141 unlink a file - cleanup any xattrs
142 */
unlink_xattr_system(struct pvfs_state * pvfs,const char * fname)143 NTSTATUS unlink_xattr_system(struct pvfs_state *pvfs, const char *fname)
144 {
145 /* nothing needs to be done for filesystem based xattrs */
146 return NT_STATUS_OK;
147 }
148