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cca7148b SP |
1 | /* |
2 | * Copyright (c) 1999-2004 | |
3 | * Stelian Pop <stelian@popies.net>, 1999-2004 | |
4 | * | |
5 | * Redistribution and use in source and binary forms, with or without | |
6 | * modification, are permitted provided that the following conditions | |
7 | * are met: | |
8 | * 1. Redistributions of source code must retain the above copyright | |
9 | * notice, this list of conditions and the following disclaimer. | |
10 | * 2. Redistributions in binary form must reproduce the above copyright | |
11 | * notice, this list of conditions and the following disclaimer in the | |
12 | * documentation and/or other materials provided with the distribution. | |
13 | * 3. Neither the name of the University nor the names of its contributors | |
14 | * may be used to endorse or promote products derived from this software | |
15 | * without specific prior written permission. | |
16 | * | |
17 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
27 | * SUCH DAMAGE. | |
28 | */ | |
29 | ||
30 | #ifndef lint | |
31 | static const char rcsid[] = | |
32 | "$Id: xattr.c,v 1.1 2005/05/02 15:10:47 stelian Exp $"; | |
33 | #endif /* not lint */ | |
34 | ||
35 | #include <config.h> | |
36 | #include <compatlfs.h> | |
37 | #include <compaterr.h> | |
38 | #include <sys/types.h> | |
39 | #include <stdio.h> | |
40 | #include <stdlib.h> | |
41 | #include <string.h> | |
42 | #include <unistd.h> | |
43 | #include <errno.h> | |
44 | #include <bsdcompat.h> | |
45 | #include <protocols/dumprestore.h> | |
46 | #include "restore.h" | |
47 | #include "extern.h" | |
48 | #include "pathnames.h" | |
49 | ||
50 | /* | |
51 | * Data structures below taken from the kernel | |
52 | */ | |
53 | ||
54 | /* Maximum number of references to one attribute block */ | |
55 | #define EXT2_XATTR_REFCOUNT_MAX 1024 | |
56 | ||
57 | /* Name indexes */ | |
58 | #define EXT2_XATTR_INDEX_MAX 10 | |
59 | #define EXT2_XATTR_INDEX_USER 1 | |
60 | #define EXT2_XATTR_INDEX_POSIX_ACL_ACCESS 2 | |
61 | #define EXT2_XATTR_INDEX_POSIX_ACL_DEFAULT 3 | |
62 | #define EXT2_XATTR_INDEX_TRUSTED 4 | |
63 | #define EXT2_XATTR_INDEX_LUSTRE 5 | |
64 | #define EXT2_XATTR_INDEX_SECURITY 6 | |
65 | ||
66 | struct ext2_xattr_header { | |
67 | u_int32_t h_magic; /* magic number for identification */ | |
68 | u_int32_t h_refcount; /* reference count */ | |
69 | u_int32_t h_blocks; /* number of disk blocks used */ | |
70 | u_int32_t h_hash; /* hash value of all attributes */ | |
71 | u_int32_t h_reserved[4]; /* zero right now */ | |
72 | }; | |
73 | ||
74 | struct ext3_xattr_ibody_header { | |
75 | u_int32_t h_magic; /* magic number for identification */ | |
76 | }; | |
77 | ||
78 | struct ext2_xattr_entry { | |
79 | u_char e_name_len; /* length of name */ | |
80 | u_char e_name_index; /* attribute name index */ | |
81 | u_int16_t e_value_offs; /* offset in disk block of value */ | |
82 | u_int32_t e_value_block; /* disk block attribute is stored on (n/i) */ | |
83 | u_int32_t e_value_size; /* size of attribute value */ | |
84 | u_int32_t e_hash; /* hash value of name and value */ | |
85 | char e_name[0]; /* attribute name */ | |
86 | }; | |
87 | ||
88 | #define EXT2_XATTR_PAD_BITS 2 | |
89 | #define EXT2_XATTR_PAD (1<<EXT2_XATTR_PAD_BITS) | |
90 | #define EXT2_XATTR_ROUND (EXT2_XATTR_PAD-1) | |
91 | #define EXT2_XATTR_LEN(name_len) \ | |
92 | (((name_len) + EXT2_XATTR_ROUND + \ | |
93 | sizeof(struct ext2_xattr_entry)) & ~EXT2_XATTR_ROUND) | |
94 | #define EXT2_XATTR_NEXT(entry) \ | |
95 | ( (struct ext2_xattr_entry *)( \ | |
96 | (char *)(entry) + EXT2_XATTR_LEN((entry)->e_name_len)) ) | |
97 | #define EXT3_XATTR_SIZE(size) \ | |
98 | (((size) + EXT2_XATTR_ROUND) & ~EXT2_XATTR_ROUND) | |
99 | ||
100 | #define HDR(buffer) ((struct ext2_xattr_header *)(buffer)) | |
101 | #define ENTRY(ptr) ((struct ext2_xattr_entry *)(ptr)) | |
102 | #define IS_LAST_ENTRY(entry) (*(__u32 *)(entry) == 0) | |
103 | ||
104 | #define BFIRST(buffer) ENTRY(HDR(buffer)+1) | |
105 | #define IFIRST(buffer) ENTRY(((struct ext3_xattr_ibody_header *)(buffer))+1) | |
106 | ||
107 | #define FIRST_ENTRY(buffer) \ | |
108 | ((HDR(buffer)->h_magic == EXT2_XATTR_MAGIC2) ? \ | |
109 | IFIRST(buffer) : \ | |
110 | BFIRST(buffer)) | |
111 | ||
112 | /* | |
113 | * On-block xattr value offsets start at the beginning of the block, but | |
114 | * on-inode xattr value offsets start after the initial header | |
115 | * (ext3_xattr_ibody_header). | |
116 | */ | |
117 | #define VALUE_OFFSET(buffer, entry) \ | |
118 | (((HDR(buffer)->h_magic == EXT2_XATTR_MAGIC2) ? \ | |
119 | (entry)->e_value_offs + sizeof(struct ext3_xattr_ibody_header) : \ | |
120 | (entry)->e_value_offs)) | |
121 | ||
122 | /* | |
123 | * xattr syscalls do not exist yet in libc, get our own copy here, | |
124 | * taken from libattr. | |
125 | */ | |
126 | #if defined (__i386__) | |
127 | # define HAVE_XATTR_SYSCALLS 1 | |
128 | # define __NR_lsetxattr 227 | |
129 | # define __NR_lgetxattr 230 | |
130 | # define __NR_llistxattr 233 | |
131 | #elif defined (__sparc__) | |
132 | # define HAVE_XATTR_SYSCALLS 1 | |
133 | # define __NR_lsetxattr 170 | |
134 | # define __NR_lgetxattr 173 | |
135 | # define __NR_llistxattr 179 | |
136 | #elif defined (__ia64__) | |
137 | # define HAVE_XATTR_SYSCALLS 1 | |
138 | # define __NR_lsetxattr 1218 | |
139 | # define __NR_lgetxattr 1221 | |
140 | # define __NR_llistxattr 1224 | |
141 | #elif defined (__powerpc__) | |
142 | # define HAVE_XATTR_SYSCALLS 1 | |
143 | # define __NR_lsetxattr 210 | |
144 | # define __NR_lgetxattr 213 | |
145 | # define __NR_llistxattr 216 | |
146 | #elif defined (__x86_64__) | |
147 | # define HAVE_XATTR_SYSCALLS 1 | |
148 | # define __NR_lsetxattr 189 | |
149 | # define __NR_lgetxattr 192 | |
150 | # define __NR_llistxattr 195 | |
151 | #elif defined (__s390__) | |
152 | # define HAVE_XATTR_SYSCALLS 1 | |
153 | # define __NR_lsetxattr 225 | |
154 | # define __NR_lgetxattr 228 | |
155 | # define __NR_llistxattr 231 | |
156 | #elif defined (__arm__) | |
157 | # define HAVE_XATTR_SYSCALLS 1 | |
158 | # define __NR_SYSCALL_BASE 0x900000 | |
159 | # define __NR_lsetxattr (__NR_SYSCALL_BASE+227) | |
160 | # define __NR_lgetxattr (__NR_SYSCALL_BASE+230) | |
161 | # define __NR_llistxattr (__NR_SYSCALL_BASE+233) | |
162 | #elif defined (__mips64__) | |
163 | # define HAVE_XATTR_SYSCALLS 1 | |
164 | # define __NR_Linux 5000 | |
165 | # define __NR_lsetxattr (__NR_Linux + 218) | |
166 | # define __NR_lgetxattr (__NR_Linux + 221) | |
167 | # define __NR_llistxattr (__NR_Linux + 224) | |
168 | #elif defined (__mips__) | |
169 | # define HAVE_XATTR_SYSCALLS 1 | |
170 | # define __NR_Linux 4000 | |
171 | # define __NR_lsetxattr (__NR_Linux + 225) | |
172 | # define __NR_lgetxattr (__NR_Linux + 228) | |
173 | # define __NR_llistxattr (__NR_Linux + 231) | |
174 | #elif defined (__alpha__) | |
175 | # define HAVE_XATTR_SYSCALLS 1 | |
176 | # define __NR_lsetxattr 383 | |
177 | # define __NR_lgetxattr 386 | |
178 | # define __NR_llistxattr 389 | |
179 | #elif defined (__mc68000__) | |
180 | # define HAVE_XATTR_SYSCALLS 1 | |
181 | # define __NR_lsetxattr 224 | |
182 | # define __NR_lgetxattr 227 | |
183 | # define __NR_llistxattr 230 | |
184 | #else | |
185 | # warning "Extended attribute syscalls undefined for this architecture" | |
186 | # define HAVE_XATTR_SYSCALLS 0 | |
187 | #endif | |
188 | ||
189 | #if HAVE_XATTR_SYSCALLS | |
190 | # define SYSCALL(args...) syscall(args) | |
191 | #else | |
192 | # define SYSCALL(args...) ( errno = ENOSYS, -1 ) | |
193 | #endif | |
194 | ||
195 | static int lsetxattr __P((const char *, const char *, void *, size_t, int)); | |
196 | static ssize_t lgetxattr __P((const char *, const char *, void *, size_t)); | |
197 | static ssize_t llistxattr __P((const char *, char *, size_t)); | |
198 | static int xattr_cb_list __P((char *, char *, int, void *)); | |
199 | static int xattr_cb_set __P((char *, char *, int, void *)); | |
200 | static int xattr_cb_compare __P((char *, char *, int, void *)); | |
201 | static int xattr_verify __P((char *)); | |
202 | static int xattr_count __P((char *, int *)); | |
203 | static int xattr_walk __P((char *, int (*)(char *, char *, int, void *), void *)); | |
204 | ||
205 | static int | |
206 | lsetxattr(const char *path, const char *name, void *value, size_t size, int flags) | |
207 | { | |
208 | return SYSCALL(__NR_lsetxattr, path, name, value, size, flags); | |
209 | } | |
210 | ||
211 | static ssize_t | |
212 | lgetxattr(const char *path, const char *name, void *value, size_t size) | |
213 | { | |
214 | return SYSCALL(__NR_lgetxattr, path, name, value, size); | |
215 | } | |
216 | ||
217 | static ssize_t | |
218 | llistxattr(const char *path, char *list, size_t size) | |
219 | { | |
220 | return SYSCALL(__NR_llistxattr, path, list, size); | |
221 | } | |
222 | ||
223 | /* | |
224 | * Dump code starts here :) | |
225 | */ | |
226 | ||
227 | static int | |
228 | xattr_cb_list(char *name, char *value, int valuelen, void *private) | |
229 | { | |
230 | value[valuelen] = '\0'; | |
231 | printf("EA: %s:%s\n", name, value); | |
232 | ||
233 | return GOOD; | |
234 | } | |
235 | ||
236 | static int | |
237 | xattr_cb_set(char *name, char *value, int valuelen, void *private) | |
238 | { | |
239 | char *path = (char *)private; | |
240 | ||
241 | if (lsetxattr(path, name, value, valuelen, 0) < 0) { | |
242 | warn("lsetxattr %s failed", path); | |
243 | return FAIL; | |
244 | } | |
245 | return GOOD; | |
246 | } | |
247 | ||
248 | static int | |
249 | xattr_cb_compare(char *name, char *value, int valuelen, void *private) | |
250 | { | |
251 | char *path = (char *)private; | |
252 | char valuef[XATTR_MAXSIZE]; | |
253 | int valuesz; | |
254 | ||
255 | valuesz = lgetxattr(path, name, valuef, XATTR_MAXSIZE); | |
256 | if (valuesz < 0) { | |
257 | warn("%s: lgetxattr failed\n", path); | |
258 | return FAIL; | |
259 | } | |
260 | ||
261 | if (valuesz != valuelen) { | |
262 | fprintf(stderr, "%s: EA %s value changed\n", path, value); | |
263 | return FAIL; | |
264 | } | |
265 | ||
266 | if (memcmp(value, valuef, valuelen)) { | |
267 | fprintf(stderr, "%s: EA %s value changed\n", path, value); | |
268 | return FAIL; | |
269 | } | |
270 | ||
271 | return GOOD; | |
272 | } | |
273 | ||
274 | static int | |
275 | xattr_verify(char *buffer) | |
276 | { | |
277 | struct ext2_xattr_entry *entry; | |
278 | char *end; | |
279 | ||
280 | end = buffer + XATTR_MAXSIZE; | |
281 | ||
282 | if (Bcvt) | |
283 | swabst("4i", (u_char *)buffer); | |
284 | ||
285 | if (HDR(buffer)->h_magic != EXT2_XATTR_MAGIC && | |
286 | HDR(buffer)->h_magic != EXT2_XATTR_MAGIC2) { | |
287 | fprintf(stderr, "error in EA block 1\n"); | |
288 | fprintf(stderr, "magic = %x\n", HDR(buffer)->h_magic); | |
289 | ||
290 | return FAIL; | |
291 | } | |
292 | ||
293 | /* check the on-disk data structure */ | |
294 | entry = FIRST_ENTRY(buffer); | |
295 | if (Bcvt) | |
296 | swabst("2b1s3i", (u_char *)entry); | |
297 | while (!IS_LAST_ENTRY(entry)) { | |
298 | struct ext2_xattr_entry *next = EXT2_XATTR_NEXT(entry); | |
299 | ||
300 | if ((char *)next >= end) { | |
301 | fprintf(stderr, "error in EA block\n"); | |
302 | return FAIL; | |
303 | } | |
304 | entry = next; | |
305 | if (Bcvt) | |
306 | swabst("2b1s3i", (u_char *)entry); | |
307 | } | |
308 | return GOOD; | |
309 | } | |
310 | ||
311 | static int | |
312 | xattr_count(char *buffer, int *count) | |
313 | { | |
314 | struct ext2_xattr_entry *entry; | |
315 | int result = 0; | |
316 | ||
317 | /* list the attribute names */ | |
318 | for (entry = FIRST_ENTRY(buffer); !IS_LAST_ENTRY(entry); | |
319 | entry = EXT2_XATTR_NEXT(entry)) | |
320 | result++; | |
321 | ||
322 | *count = result; | |
323 | return GOOD; | |
324 | } | |
325 | ||
326 | static int | |
327 | xattr_walk(char *buffer, int (*xattr_cb)(char *, char *, int, void *), void *private) | |
328 | { | |
329 | struct ext2_xattr_entry *entry; | |
330 | ||
331 | /* list the attribute names */ | |
332 | for (entry = FIRST_ENTRY(buffer); !IS_LAST_ENTRY(entry); | |
333 | entry = EXT2_XATTR_NEXT(entry)) { | |
334 | char name[XATTR_MAXSIZE], value[XATTR_MAXSIZE]; | |
335 | int off; | |
336 | ||
337 | switch (entry->e_name_index) { | |
338 | case EXT2_XATTR_INDEX_USER: | |
339 | strcpy(name, "user."); | |
340 | break; | |
341 | case EXT2_XATTR_INDEX_POSIX_ACL_ACCESS: | |
342 | case EXT2_XATTR_INDEX_POSIX_ACL_DEFAULT: | |
343 | strcpy(name, "system."); | |
344 | break; | |
345 | case EXT2_XATTR_INDEX_TRUSTED: | |
346 | strcpy(name, "trusted."); | |
347 | break; | |
348 | case EXT2_XATTR_INDEX_LUSTRE: | |
349 | strcpy(name, "lustre."); | |
350 | break; | |
351 | case EXT2_XATTR_INDEX_SECURITY: | |
352 | strcpy(name, "security."); | |
353 | break; | |
354 | default: | |
355 | fprintf(stderr, "Unknown EA index\n"); | |
356 | return FAIL; | |
357 | } | |
358 | ||
359 | off = strlen(name); | |
360 | memcpy(name + off, entry->e_name, entry->e_name_len); | |
361 | name[off + entry->e_name_len] = '\0'; | |
362 | ||
363 | ||
364 | memcpy(value, buffer + VALUE_OFFSET(buffer, entry), entry->e_value_size); | |
365 | ||
366 | if (xattr_cb(name, value, entry->e_value_size, private) != GOOD) | |
367 | return FAIL; | |
368 | } | |
369 | ||
370 | return GOOD; | |
371 | } | |
372 | ||
373 | int | |
374 | xattr_compare(char *path, char *buffer) | |
375 | { | |
376 | int countf, countt; | |
377 | char *names = NULL, *end_names, *name; | |
378 | ||
379 | countf = llistxattr(path, NULL, 0); | |
380 | if (countf < 0) { | |
381 | warn("%s: llistxattr failed", path); | |
382 | return FAIL; | |
383 | } | |
384 | ||
385 | names = malloc(countf + 1); | |
386 | if (!names) { | |
387 | warn("%s: llistxattr failed", path); | |
388 | return FAIL; | |
389 | } | |
390 | ||
391 | countf = llistxattr(path, names, countf); | |
392 | if (countf < 0) { | |
393 | warn("%s: llistxattr failed", path); | |
394 | free(names); | |
395 | return FAIL; | |
396 | } | |
397 | ||
398 | names[countf] = '\0'; | |
399 | end_names = names + countf; | |
400 | ||
401 | countf = 0; | |
402 | for (name = names; name != end_names; name = strchr(name, '\0') + 1) { | |
403 | if (!*name) | |
404 | continue; | |
405 | countf++; | |
406 | } | |
407 | ||
408 | free(names); | |
409 | ||
410 | if (buffer) { | |
411 | if (xattr_verify(buffer) == FAIL) | |
412 | return FAIL; | |
413 | ||
414 | if (xattr_count(buffer, &countt) == FAIL) | |
415 | return FAIL; | |
416 | } | |
417 | else | |
418 | countt = 0; | |
419 | ||
420 | if (countf != countt) { | |
421 | fprintf(stderr, "%s: EA count changed from %d to %d\n", path, countt, countf); | |
422 | return FAIL; | |
423 | } | |
424 | ||
425 | if (!buffer) | |
426 | return GOOD; | |
427 | ||
428 | return xattr_walk(buffer, xattr_cb_compare, path); | |
429 | } | |
430 | ||
431 | int | |
432 | xattr_extract(char *path, char *buffer) | |
433 | { | |
434 | if (dflag) { | |
435 | fprintf(stderr, "xattr_extract(%s)\n", path); | |
436 | xattr_walk(buffer, xattr_cb_list, NULL); | |
437 | } | |
438 | ||
439 | if (xattr_verify(buffer) == FAIL) | |
440 | return FAIL; | |
441 | ||
442 | return xattr_walk(buffer, xattr_cb_set, path); | |
443 | } | |
444 |