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16edf865 WD |
1 | /* |
2 | * Extended attribute support for rsync. | |
3 | * | |
4 | * Copyright (C) 2004 Red Hat, Inc. | |
d3d07a5e | 5 | * Copyright (C) 2003-2008 Wayne Davison |
16edf865 WD |
6 | * Written by Jay Fenlason. |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
8e41b68e WD |
9 | * it under the terms of the GNU General Public License as published by |
10 | * the Free Software Foundation; either version 3 of the License, or | |
11 | * (at your option) any later version. | |
16edf865 WD |
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 along | |
4fd842f9 | 19 | * with this program; if not, visit the http://fsf.org website. |
16edf865 WD |
20 | */ |
21 | ||
22 | #include "rsync.h" | |
23 | #include "sysxattrs.h" | |
24 | ||
25 | #ifdef SUPPORT_XATTRS | |
26 | ||
27 | #if defined HAVE_LINUX_XATTRS | |
28 | ||
29 | ssize_t sys_lgetxattr(const char *path, const char *name, void *value, size_t size) | |
30 | { | |
31 | return lgetxattr(path, name, value, size); | |
32 | } | |
33 | ||
34 | ssize_t sys_fgetxattr(int filedes, const char *name, void *value, size_t size) | |
35 | { | |
36 | return fgetxattr(filedes, name, value, size); | |
37 | } | |
38 | ||
39 | int sys_lsetxattr(const char *path, const char *name, const void *value, size_t size) | |
40 | { | |
41 | return lsetxattr(path, name, value, size, 0); | |
42 | } | |
43 | ||
44 | int sys_lremovexattr(const char *path, const char *name) | |
45 | { | |
46 | return lremovexattr(path, name); | |
47 | } | |
48 | ||
49 | ssize_t sys_llistxattr(const char *path, char *list, size_t size) | |
50 | { | |
51 | return llistxattr(path, list, size); | |
52 | } | |
53 | ||
54 | #elif HAVE_OSX_XATTRS | |
55 | ||
56 | ssize_t sys_lgetxattr(const char *path, const char *name, void *value, size_t size) | |
57 | { | |
58 | return getxattr(path, name, value, size, 0, XATTR_NOFOLLOW); | |
59 | } | |
60 | ||
61 | ssize_t sys_fgetxattr(int filedes, const char *name, void *value, size_t size) | |
62 | { | |
63 | return fgetxattr(filedes, name, value, size, 0, 0); | |
64 | } | |
65 | ||
66 | int sys_lsetxattr(const char *path, const char *name, const void *value, size_t size) | |
67 | { | |
68 | return setxattr(path, name, value, size, 0, XATTR_NOFOLLOW); | |
69 | } | |
70 | ||
71 | int sys_lremovexattr(const char *path, const char *name) | |
72 | { | |
73 | return removexattr(path, name, XATTR_NOFOLLOW); | |
74 | } | |
75 | ||
76 | ssize_t sys_llistxattr(const char *path, char *list, size_t size) | |
77 | { | |
78 | return listxattr(path, list, size, XATTR_NOFOLLOW); | |
79 | } | |
80 | ||
81 | #elif HAVE_FREEBSD_XATTRS | |
82 | ||
83 | ssize_t sys_lgetxattr(const char *path, const char *name, void *value, size_t size) | |
84 | { | |
85 | return extattr_get_link(path, EXTATTR_NAMESPACE_USER, name, value, size); | |
86 | } | |
87 | ||
88 | ssize_t sys_fgetxattr(int filedes, const char *name, void *value, size_t size) | |
89 | { | |
90 | return extattr_get_fd(filedes, EXTATTR_NAMESPACE_USER, name, value, size); | |
91 | } | |
92 | ||
93 | int sys_lsetxattr(const char *path, const char *name, const void *value, size_t size) | |
94 | { | |
95 | return extattr_set_link(path, EXTATTR_NAMESPACE_USER, name, value, size); | |
96 | } | |
97 | ||
98 | int sys_lremovexattr(const char *path, const char *name) | |
99 | { | |
100 | return extattr_delete_link(path, EXTATTR_NAMESPACE_USER, name); | |
101 | } | |
102 | ||
103 | ssize_t sys_llistxattr(const char *path, char *list, size_t size) | |
104 | { | |
105 | unsigned char keylen; | |
106 | ssize_t off, len = extattr_list_link(path, EXTATTR_NAMESPACE_USER, list, size); | |
107 | ||
108 | if (len <= 0 || (size_t)len > size) | |
109 | return len; | |
110 | ||
111 | /* FreeBSD puts a single-byte length before each string, with no '\0' | |
112 | * terminator. We need to change this into a series of null-terminted | |
113 | * strings. Since the size is the same, we can simply transform the | |
114 | * output in place. */ | |
115 | for (off = 0; off < len; off += keylen + 1) { | |
116 | keylen = ((unsigned char*)list)[off]; | |
117 | if (off + keylen >= len) { | |
118 | /* Should be impossible, but kernel bugs happen! */ | |
119 | errno = EINVAL; | |
120 | return -1; | |
121 | } | |
122 | memmove(list+off, list+off+1, keylen); | |
123 | list[off+keylen] = '\0'; | |
124 | } | |
125 | ||
126 | return len; | |
127 | } | |
128 | ||
049f8cbc WD |
129 | #elif HAVE_SOLARIS_XATTRS |
130 | ||
05a652d0 | 131 | static ssize_t read_xattr(int attrfd, void *buf, size_t buflen) |
049f8cbc | 132 | { |
05a652d0 WD |
133 | STRUCT_STAT sb; |
134 | ssize_t ret; | |
135 | ||
18bd0401 | 136 | if (fstat(attrfd, &sb) < 0) |
05a652d0 WD |
137 | ret = -1; |
138 | else if (sb.st_size > SSIZE_MAX) { | |
139 | errno = ERANGE; | |
140 | ret = -1; | |
18bd0401 | 141 | } else if (buflen == 0) |
05a652d0 | 142 | ret = sb.st_size; |
18bd0401 | 143 | else if (sb.st_size > buflen) { |
05a652d0 WD |
144 | errno = ERANGE; |
145 | ret = -1; | |
146 | } else { | |
147 | size_t bufpos; | |
17cc4c38 WD |
148 | for (bufpos = 0; bufpos < sb.st_size; ) { |
149 | ssize_t cnt = read(attrfd, buf + bufpos, sb.st_size - bufpos); | |
05a652d0 WD |
150 | if (cnt <= 0) { |
151 | if (cnt < 0 && errno == EINTR) | |
152 | continue; | |
049f8cbc | 153 | bufpos = -1; |
05a652d0 WD |
154 | break; |
155 | } | |
156 | bufpos += cnt; | |
049f8cbc | 157 | } |
05a652d0 | 158 | ret = bufpos; |
049f8cbc WD |
159 | } |
160 | ||
161 | close(attrfd); | |
162 | ||
05a652d0 | 163 | return ret; |
049f8cbc WD |
164 | } |
165 | ||
166 | ssize_t sys_lgetxattr(const char *path, const char *name, void *value, size_t size) | |
167 | { | |
168 | int attrfd; | |
169 | ||
170 | if ((attrfd = attropen(path, name, O_RDONLY)) < 0) { | |
171 | errno = ENOATTR; | |
172 | return -1; | |
173 | } | |
174 | ||
175 | return read_xattr(attrfd, value, size); | |
176 | } | |
177 | ||
178 | ssize_t sys_fgetxattr(int filedes, const char *name, void *value, size_t size) | |
179 | { | |
180 | int attrfd; | |
181 | ||
05a652d0 | 182 | if ((attrfd = openat(filedes, name, O_RDONLY|O_XATTR, 0)) < 0) { |
049f8cbc WD |
183 | errno = ENOATTR; |
184 | return -1; | |
185 | } | |
186 | ||
187 | return read_xattr(attrfd, value, size); | |
049f8cbc WD |
188 | } |
189 | ||
190 | int sys_lsetxattr(const char *path, const char *name, const void *value, size_t size) | |
191 | { | |
192 | int attrfd; | |
193 | size_t bufpos; | |
194 | mode_t mode = S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP; | |
195 | ||
486ecd3d | 196 | if ((attrfd = attropen(path, name, O_CREAT|O_TRUNC|O_WRONLY, mode)) < 0) |
049f8cbc WD |
197 | return -1; |
198 | ||
199 | for (bufpos = 0; bufpos < size; ) { | |
05a652d0 WD |
200 | ssize_t cnt = write(attrfd, value+bufpos, size); |
201 | if (cnt <= 0) { | |
202 | if (cnt < 0 && errno == EINTR) | |
203 | continue; | |
049f8cbc WD |
204 | bufpos = -1; |
205 | break; | |
206 | } | |
05a652d0 | 207 | bufpos += cnt; |
049f8cbc WD |
208 | } |
209 | ||
210 | close(attrfd); | |
211 | ||
05a652d0 | 212 | return bufpos > 0 ? 0 : -1; |
049f8cbc WD |
213 | } |
214 | ||
215 | int sys_lremovexattr(const char *path, const char *name) | |
216 | { | |
217 | int attrdirfd; | |
218 | int ret; | |
219 | ||
2c1aa2ef | 220 | if ((attrdirfd = attropen(path, ".", O_RDONLY)) < 0) |
049f8cbc WD |
221 | return -1; |
222 | ||
223 | ret = unlinkat(attrdirfd, name, 0); | |
224 | ||
225 | close(attrdirfd); | |
226 | ||
227 | return ret; | |
228 | } | |
229 | ||
230 | ssize_t sys_llistxattr(const char *path, char *list, size_t size) | |
231 | { | |
232 | int attrdirfd; | |
233 | DIR *dirp; | |
234 | struct dirent *dp; | |
05a652d0 | 235 | ssize_t ret = 0; |
049f8cbc WD |
236 | |
237 | if ((attrdirfd = attropen(path, ".", O_RDONLY)) < 0) { | |
238 | errno = ENOTSUP; | |
239 | return -1; | |
240 | } | |
241 | ||
242 | if ((dirp = fdopendir(attrdirfd)) == NULL) { | |
243 | close(attrdirfd); | |
244 | return -1; | |
245 | } | |
246 | ||
247 | while ((dp = readdir(dirp))) { | |
05a652d0 | 248 | int len = strlen(dp->d_name); |
049f8cbc | 249 | |
05a652d0 | 250 | if (dp->d_name[0] == '.' && (len == 1 || (len == 2 && dp->d_name[1] == '.'))) |
049f8cbc | 251 | continue; |
05a652d0 | 252 | if (len == 11 && dp->d_name[0] == 'S' && strncmp(dp->d_name, "SUNWattr_r", 10) == 0 |
049f8cbc WD |
253 | && (dp->d_name[10] == 'o' || dp->d_name[10] == 'w')) |
254 | continue; | |
255 | ||
05a652d0 | 256 | if ((ret += len+1) > size) { |
2523d0cc WD |
257 | if (size == 0) |
258 | continue; | |
05a652d0 WD |
259 | ret = -1; |
260 | errno = ERANGE; | |
261 | break; | |
262 | } | |
263 | memcpy(list, dp->d_name, len+1); | |
264 | list += len+1; | |
049f8cbc WD |
265 | } |
266 | ||
267 | closedir(dirp); | |
268 | close(attrdirfd); | |
269 | ||
05a652d0 | 270 | return ret; |
049f8cbc WD |
271 | } |
272 | ||
16edf865 WD |
273 | #else |
274 | ||
275 | #error You need to create xattr compatibility functions. | |
276 | ||
277 | #endif | |
278 | ||
279 | #endif /* SUPPORT_XATTRS */ |