1 /*-
2 * Copyright (c) 2003-2009 Tim Kientzle
3 * Copyright (c) 2010-2012 Michihiro NAKAJIMA
4 * Copyright (c) 2016 Martin Matuska
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28 #include "archive_platform.h"
29
30 /* This is the tree-walking code for POSIX systems. */
31 #if !defined(_WIN32) || defined(__CYGWIN__)
32
33 #ifdef HAVE_SYS_TYPES_H
34 #include <sys/types.h>
35 #endif
36 #ifdef HAVE_SYS_EXTATTR_H
37 #include <sys/extattr.h>
38 #endif
39 #ifdef HAVE_SYS_IOCTL_H
40 #include <sys/ioctl.h>
41 #endif
42 #ifdef HAVE_SYS_PARAM_H
43 #include <sys/param.h>
44 #endif
45 #ifdef HAVE_SYS_STAT_H
46 #include <sys/stat.h>
47 #endif
48 #if defined(HAVE_SYS_XATTR_H)
49 #include <sys/xattr.h>
50 #elif defined(HAVE_ATTR_XATTR_H)
51 #include <attr/xattr.h>
52 #endif
53 #ifdef HAVE_SYS_EA_H
54 #include <sys/ea.h>
55 #endif
56 #ifdef HAVE_COPYFILE_H
57 #include <copyfile.h>
58 #endif
59 #ifdef HAVE_ERRNO_H
60 #include <errno.h>
61 #endif
62 #ifdef HAVE_FCNTL_H
63 #include <fcntl.h>
64 #endif
65 #ifdef HAVE_LIMITS_H
66 #include <limits.h>
67 #endif
68 #ifdef HAVE_LINUX_TYPES_H
69 #include <linux/types.h>
70 #endif
71 #ifdef HAVE_LINUX_FIEMAP_H
72 #include <linux/fiemap.h>
73 #endif
74 #ifdef HAVE_LINUX_FS_H
75 #include <linux/fs.h>
76 #endif
77 /*
78 * Some Linux distributions have both linux/ext2_fs.h and ext2fs/ext2_fs.h.
79 * As the include guards don't agree, the order of include is important.
80 */
81 #ifdef HAVE_LINUX_EXT2_FS_H
82 #include <linux/ext2_fs.h> /* for Linux file flags */
83 #endif
84 #if defined(HAVE_EXT2FS_EXT2_FS_H) && !defined(__CYGWIN__)
85 #include <ext2fs/ext2_fs.h> /* Linux file flags, broken on Cygwin */
86 #endif
87 #ifdef HAVE_PATHS_H
88 #include <paths.h>
89 #endif
90 #ifdef HAVE_UNISTD_H
91 #include <unistd.h>
92 #endif
93
94 #include "archive.h"
95 #include "archive_entry.h"
96 #include "archive_private.h"
97 #include "archive_read_disk_private.h"
98
99 #ifndef O_CLOEXEC
100 #define O_CLOEXEC 0
101 #endif
102
103 static int setup_mac_metadata(struct archive_read_disk *,
104 struct archive_entry *, int *fd);
105 #ifdef ARCHIVE_XATTR_FREEBSD
106 static int setup_xattrs_namespace(struct archive_read_disk *,
107 struct archive_entry *, int *, int);
108 #endif
109 static int setup_xattrs(struct archive_read_disk *,
110 struct archive_entry *, int *fd);
111 static int setup_sparse(struct archive_read_disk *,
112 struct archive_entry *, int *fd);
113 #if defined(HAVE_LINUX_FIEMAP_H)
114 static int setup_sparse_fiemap(struct archive_read_disk *,
115 struct archive_entry *, int *fd);
116 #endif
117
118 #if !ARCHIVE_ACL_SUPPORT
119 int
archive_read_disk_entry_setup_acls(struct archive_read_disk * a,struct archive_entry * entry,int * fd)120 archive_read_disk_entry_setup_acls(struct archive_read_disk *a,
121 struct archive_entry *entry, int *fd)
122 {
123 (void)a; /* UNUSED */
124 (void)entry; /* UNUSED */
125 (void)fd; /* UNUSED */
126 return (ARCHIVE_OK);
127 }
128 #endif
129
130 /*
131 * Enter working directory and return working pathname of archive_entry.
132 * If a pointer to an integer is provided and its value is below zero
133 * open a file descriptor on this pathname.
134 */
135 const char *
archive_read_disk_entry_setup_path(struct archive_read_disk * a,struct archive_entry * entry,int * fd)136 archive_read_disk_entry_setup_path(struct archive_read_disk *a,
137 struct archive_entry *entry, int *fd)
138 {
139 const char *path;
140
141 path = archive_entry_sourcepath(entry);
142
143 if (path == NULL || (a->tree != NULL &&
144 a->tree_enter_working_dir(a->tree) != 0))
145 path = archive_entry_pathname(entry);
146 if (path == NULL) {
147 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
148 "Couldn't determine path");
149 } else if (fd != NULL && *fd < 0 && a->tree != NULL &&
150 (a->follow_symlinks || archive_entry_filetype(entry) != AE_IFLNK)) {
151 *fd = a->open_on_current_dir(a->tree, path,
152 O_RDONLY | O_NONBLOCK);
153 }
154 return (path);
155 }
156
157 int
archive_read_disk_entry_from_file(struct archive * _a,struct archive_entry * entry,int fd,const struct stat * st)158 archive_read_disk_entry_from_file(struct archive *_a,
159 struct archive_entry *entry,
160 int fd,
161 const struct stat *st)
162 {
163 struct archive_read_disk *a = (struct archive_read_disk *)_a;
164 const char *path, *name;
165 struct stat s;
166 int initial_fd = fd;
167 int r, r1;
168
169 archive_check_magic(_a, ARCHIVE_READ_DISK_MAGIC, ARCHIVE_STATE_ANY,
170 "archive_read_disk_entry_from_file");
171
172 archive_clear_error(_a);
173 path = archive_entry_sourcepath(entry);
174 if (path == NULL)
175 path = archive_entry_pathname(entry);
176
177 if (a->tree == NULL) {
178 if (st == NULL) {
179 #if HAVE_FSTAT
180 if (fd >= 0) {
181 if (fstat(fd, &s) != 0) {
182 archive_set_error(&a->archive, errno,
183 "Can't fstat");
184 return (ARCHIVE_FAILED);
185 }
186 } else
187 #endif
188 #if HAVE_LSTAT
189 if (!a->follow_symlinks) {
190 if (lstat(path, &s) != 0) {
191 archive_set_error(&a->archive, errno,
192 "Can't lstat %s", path);
193 return (ARCHIVE_FAILED);
194 }
195 } else
196 #endif
197 if (la_stat(path, &s) != 0) {
198 archive_set_error(&a->archive, errno,
199 "Can't stat %s", path);
200 return (ARCHIVE_FAILED);
201 }
202 st = &s;
203 }
204 archive_entry_copy_stat(entry, st);
205 }
206
207 /* Lookup uname/gname */
208 name = archive_read_disk_uname(_a, archive_entry_uid(entry));
209 if (name != NULL)
210 archive_entry_copy_uname(entry, name);
211 name = archive_read_disk_gname(_a, archive_entry_gid(entry));
212 if (name != NULL)
213 archive_entry_copy_gname(entry, name);
214
215 #ifdef HAVE_STRUCT_STAT_ST_FLAGS
216 /* On FreeBSD, we get flags for free with the stat. */
217 /* TODO: Does this belong in copy_stat()? */
218 if ((a->flags & ARCHIVE_READDISK_NO_FFLAGS) == 0 && st->st_flags != 0)
219 archive_entry_set_fflags(entry, st->st_flags, 0);
220 #endif
221
222 #if (defined(FS_IOC_GETFLAGS) && defined(HAVE_WORKING_FS_IOC_GETFLAGS)) || \
223 (defined(EXT2_IOC_GETFLAGS) && defined(HAVE_WORKING_EXT2_IOC_GETFLAGS))
224 /* Linux requires an extra ioctl to pull the flags. Although
225 * this is an extra step, it has a nice side-effect: We get an
226 * open file descriptor which we can use in the subsequent lookups. */
227 if ((a->flags & ARCHIVE_READDISK_NO_FFLAGS) == 0 &&
228 (S_ISREG(st->st_mode) || S_ISDIR(st->st_mode))) {
229 if (fd < 0) {
230 if (a->tree != NULL)
231 fd = a->open_on_current_dir(a->tree, path,
232 O_RDONLY | O_NONBLOCK | O_CLOEXEC);
233 else
234 fd = open(path, O_RDONLY | O_NONBLOCK |
235 O_CLOEXEC);
236 __archive_ensure_cloexec_flag(fd);
237 }
238 if (fd >= 0) {
239 int stflags;
240 r = ioctl(fd,
241 #if defined(FS_IOC_GETFLAGS)
242 FS_IOC_GETFLAGS,
243 #else
244 EXT2_IOC_GETFLAGS,
245 #endif
246 &stflags);
247 if (r == 0 && stflags != 0)
248 archive_entry_set_fflags(entry, stflags, 0);
249 }
250 }
251 #endif
252
253 #if defined(HAVE_READLINK) || defined(HAVE_READLINKAT)
254 if (S_ISLNK(st->st_mode)) {
255 size_t linkbuffer_len = st->st_size;
256 char *linkbuffer;
257 int lnklen;
258
259 linkbuffer = malloc(linkbuffer_len + 1);
260 if (linkbuffer == NULL) {
261 archive_set_error(&a->archive, ENOMEM,
262 "Couldn't read link data");
263 return (ARCHIVE_FAILED);
264 }
265 if (a->tree != NULL) {
266 #ifdef HAVE_READLINKAT
267 lnklen = readlinkat(a->tree_current_dir_fd(a->tree),
268 path, linkbuffer, linkbuffer_len);
269 #else
270 if (a->tree_enter_working_dir(a->tree) != 0) {
271 archive_set_error(&a->archive, errno,
272 "Couldn't read link data");
273 free(linkbuffer);
274 return (ARCHIVE_FAILED);
275 }
276 lnklen = readlink(path, linkbuffer, linkbuffer_len);
277 #endif /* HAVE_READLINKAT */
278 } else
279 lnklen = readlink(path, linkbuffer, linkbuffer_len);
280 if (lnklen < 0) {
281 archive_set_error(&a->archive, errno,
282 "Couldn't read link data");
283 free(linkbuffer);
284 return (ARCHIVE_FAILED);
285 }
286 linkbuffer[lnklen] = '\0';
287 archive_entry_set_symlink(entry, linkbuffer);
288 free(linkbuffer);
289 }
290 #endif /* HAVE_READLINK || HAVE_READLINKAT */
291
292 r = 0;
293 if ((a->flags & ARCHIVE_READDISK_NO_ACL) == 0)
294 r = archive_read_disk_entry_setup_acls(a, entry, &fd);
295 if ((a->flags & ARCHIVE_READDISK_NO_XATTR) == 0) {
296 r1 = setup_xattrs(a, entry, &fd);
297 if (r1 < r)
298 r = r1;
299 }
300 if (a->flags & ARCHIVE_READDISK_MAC_COPYFILE) {
301 r1 = setup_mac_metadata(a, entry, &fd);
302 if (r1 < r)
303 r = r1;
304 }
305 if ((a->flags & ARCHIVE_READDISK_NO_SPARSE) == 0) {
306 r1 = setup_sparse(a, entry, &fd);
307 if (r1 < r)
308 r = r1;
309 }
310
311 /* If we opened the file earlier in this function, close it. */
312 if (initial_fd != fd)
313 close(fd);
314 return (r);
315 }
316
317 #if defined(__APPLE__) && defined(HAVE_COPYFILE_H)
318 /*
319 * The Mac OS "copyfile()" API copies the extended metadata for a
320 * file into a separate file in AppleDouble format (see RFC 1740).
321 *
322 * Mac OS tar and cpio implementations store this extended
323 * metadata as a separate entry just before the regular entry
324 * with a "._" prefix added to the filename.
325 *
326 * Note that this is currently done unconditionally; the tar program has
327 * an option to discard this information before the archive is written.
328 *
329 * TODO: If there's a failure, report it and return ARCHIVE_WARN.
330 */
331 static int
setup_mac_metadata(struct archive_read_disk * a,struct archive_entry * entry,int * fd)332 setup_mac_metadata(struct archive_read_disk *a,
333 struct archive_entry *entry, int *fd)
334 {
335 int tempfd = -1;
336 int copyfile_flags = COPYFILE_NOFOLLOW | COPYFILE_ACL | COPYFILE_XATTR;
337 struct stat copyfile_stat;
338 int ret = ARCHIVE_OK;
339 void *buff = NULL;
340 int have_attrs;
341 const char *name, *tempdir;
342 struct archive_string tempfile;
343
344 (void)fd; /* UNUSED */
345
346 name = archive_read_disk_entry_setup_path(a, entry, NULL);
347 if (name == NULL)
348 return (ARCHIVE_WARN);
349
350 /* Short-circuit if there's nothing to do. */
351 have_attrs = copyfile(name, NULL, 0, copyfile_flags | COPYFILE_CHECK);
352 if (have_attrs == -1) {
353 archive_set_error(&a->archive, errno,
354 "Could not check extended attributes");
355 return (ARCHIVE_WARN);
356 }
357 if (have_attrs == 0)
358 return (ARCHIVE_OK);
359
360 tempdir = NULL;
361 if (issetugid() == 0)
362 tempdir = getenv("TMPDIR");
363 if (tempdir == NULL)
364 tempdir = _PATH_TMP;
365 archive_string_init(&tempfile);
366 archive_strcpy(&tempfile, tempdir);
367 archive_strcat(&tempfile, "tar.md.XXXXXX");
368 tempfd = mkstemp(tempfile.s);
369 if (tempfd < 0) {
370 archive_set_error(&a->archive, errno,
371 "Could not open extended attribute file");
372 ret = ARCHIVE_WARN;
373 goto cleanup;
374 }
375 __archive_ensure_cloexec_flag(tempfd);
376
377 /* XXX I wish copyfile() could pack directly to a memory
378 * buffer; that would avoid the temp file here. For that
379 * matter, it would be nice if fcopyfile() actually worked,
380 * that would reduce the many open/close races here. */
381 if (copyfile(name, tempfile.s, 0, copyfile_flags | COPYFILE_PACK)) {
382 archive_set_error(&a->archive, errno,
383 "Could not pack extended attributes");
384 ret = ARCHIVE_WARN;
385 goto cleanup;
386 }
387 if (fstat(tempfd, ©file_stat)) {
388 archive_set_error(&a->archive, errno,
389 "Could not check size of extended attributes");
390 ret = ARCHIVE_WARN;
391 goto cleanup;
392 }
393 buff = malloc(copyfile_stat.st_size);
394 if (buff == NULL) {
395 archive_set_error(&a->archive, errno,
396 "Could not allocate memory for extended attributes");
397 ret = ARCHIVE_WARN;
398 goto cleanup;
399 }
400 if (copyfile_stat.st_size != read(tempfd, buff, copyfile_stat.st_size)) {
401 archive_set_error(&a->archive, errno,
402 "Could not read extended attributes into memory");
403 ret = ARCHIVE_WARN;
404 goto cleanup;
405 }
406 archive_entry_copy_mac_metadata(entry, buff, copyfile_stat.st_size);
407
408 cleanup:
409 if (tempfd >= 0) {
410 close(tempfd);
411 unlink(tempfile.s);
412 }
413 archive_string_free(&tempfile);
414 free(buff);
415 return (ret);
416 }
417
418 #else
419
420 /*
421 * Stub implementation for non-Mac systems.
422 */
423 static int
setup_mac_metadata(struct archive_read_disk * a,struct archive_entry * entry,int * fd)424 setup_mac_metadata(struct archive_read_disk *a,
425 struct archive_entry *entry, int *fd)
426 {
427 (void)a; /* UNUSED */
428 (void)entry; /* UNUSED */
429 (void)fd; /* UNUSED */
430 return (ARCHIVE_OK);
431 }
432 #endif
433
434 #if ARCHIVE_XATTR_LINUX || ARCHIVE_XATTR_DARWIN || ARCHIVE_XATTR_AIX
435
436 /*
437 * Linux, Darwin and AIX extended attribute support.
438 *
439 * TODO: By using a stack-allocated buffer for the first
440 * call to getxattr(), we might be able to avoid the second
441 * call entirely. We only need the second call if the
442 * stack-allocated buffer is too small. But a modest buffer
443 * of 1024 bytes or so will often be big enough. Same applies
444 * to listxattr().
445 */
446
447
448 static int
setup_xattr(struct archive_read_disk * a,struct archive_entry * entry,const char * name,int fd,const char * accpath)449 setup_xattr(struct archive_read_disk *a,
450 struct archive_entry *entry, const char *name, int fd, const char *accpath)
451 {
452 ssize_t size;
453 void *value = NULL;
454
455
456 if (fd >= 0) {
457 #if ARCHIVE_XATTR_LINUX
458 size = fgetxattr(fd, name, NULL, 0);
459 #elif ARCHIVE_XATTR_DARWIN
460 size = fgetxattr(fd, name, NULL, 0, 0, 0);
461 #elif ARCHIVE_XATTR_AIX
462 size = fgetea(fd, name, NULL, 0);
463 #endif
464 } else if (!a->follow_symlinks) {
465 #if ARCHIVE_XATTR_LINUX
466 size = lgetxattr(accpath, name, NULL, 0);
467 #elif ARCHIVE_XATTR_DARWIN
468 size = getxattr(accpath, name, NULL, 0, 0, XATTR_NOFOLLOW);
469 #elif ARCHIVE_XATTR_AIX
470 size = lgetea(accpath, name, NULL, 0);
471 #endif
472 } else {
473 #if ARCHIVE_XATTR_LINUX
474 size = getxattr(accpath, name, NULL, 0);
475 #elif ARCHIVE_XATTR_DARWIN
476 size = getxattr(accpath, name, NULL, 0, 0, 0);
477 #elif ARCHIVE_XATTR_AIX
478 size = getea(accpath, name, NULL, 0);
479 #endif
480 }
481
482 if (size == -1) {
483 archive_set_error(&a->archive, errno,
484 "Couldn't query extended attribute");
485 return (ARCHIVE_WARN);
486 }
487
488 if (size > 0 && (value = malloc(size)) == NULL) {
489 archive_set_error(&a->archive, errno, "Out of memory");
490 return (ARCHIVE_FATAL);
491 }
492
493
494 if (fd >= 0) {
495 #if ARCHIVE_XATTR_LINUX
496 size = fgetxattr(fd, name, value, size);
497 #elif ARCHIVE_XATTR_DARWIN
498 size = fgetxattr(fd, name, value, size, 0, 0);
499 #elif ARCHIVE_XATTR_AIX
500 size = fgetea(fd, name, value, size);
501 #endif
502 } else if (!a->follow_symlinks) {
503 #if ARCHIVE_XATTR_LINUX
504 size = lgetxattr(accpath, name, value, size);
505 #elif ARCHIVE_XATTR_DARWIN
506 size = getxattr(accpath, name, value, size, 0, XATTR_NOFOLLOW);
507 #elif ARCHIVE_XATTR_AIX
508 size = lgetea(accpath, name, value, size);
509 #endif
510 } else {
511 #if ARCHIVE_XATTR_LINUX
512 size = getxattr(accpath, name, value, size);
513 #elif ARCHIVE_XATTR_DARWIN
514 size = getxattr(accpath, name, value, size, 0, 0);
515 #elif ARCHIVE_XATTR_AIX
516 size = getea(accpath, name, value, size);
517 #endif
518 }
519
520 if (size == -1) {
521 archive_set_error(&a->archive, errno,
522 "Couldn't read extended attribute");
523 free(value);
524 return (ARCHIVE_WARN);
525 }
526
527 archive_entry_xattr_add_entry(entry, name, value, size);
528
529 free(value);
530 return (ARCHIVE_OK);
531 }
532
533 static int
setup_xattrs(struct archive_read_disk * a,struct archive_entry * entry,int * fd)534 setup_xattrs(struct archive_read_disk *a,
535 struct archive_entry *entry, int *fd)
536 {
537 char *list, *p;
538 const char *path;
539 ssize_t list_size;
540
541 path = NULL;
542
543 if (*fd < 0) {
544 path = archive_read_disk_entry_setup_path(a, entry, fd);
545 if (path == NULL)
546 return (ARCHIVE_WARN);
547 }
548
549 if (*fd >= 0) {
550 #if ARCHIVE_XATTR_LINUX
551 list_size = flistxattr(*fd, NULL, 0);
552 #elif ARCHIVE_XATTR_DARWIN
553 list_size = flistxattr(*fd, NULL, 0, 0);
554 #elif ARCHIVE_XATTR_AIX
555 list_size = flistea(*fd, NULL, 0);
556 #endif
557 } else if (!a->follow_symlinks) {
558 #if ARCHIVE_XATTR_LINUX
559 list_size = llistxattr(path, NULL, 0);
560 #elif ARCHIVE_XATTR_DARWIN
561 list_size = listxattr(path, NULL, 0, XATTR_NOFOLLOW);
562 #elif ARCHIVE_XATTR_AIX
563 list_size = llistea(path, NULL, 0);
564 #endif
565 } else {
566 #if ARCHIVE_XATTR_LINUX
567 list_size = listxattr(path, NULL, 0);
568 #elif ARCHIVE_XATTR_DARWIN
569 list_size = listxattr(path, NULL, 0, 0);
570 #elif ARCHIVE_XATTR_AIX
571 list_size = listea(path, NULL, 0);
572 #endif
573 }
574
575 if (list_size == -1) {
576 if (errno == ENOTSUP || errno == ENOSYS)
577 return (ARCHIVE_OK);
578 archive_set_error(&a->archive, errno,
579 "Couldn't list extended attributes");
580 return (ARCHIVE_WARN);
581 }
582
583 if (list_size == 0)
584 return (ARCHIVE_OK);
585
586 if ((list = malloc(list_size)) == NULL) {
587 archive_set_error(&a->archive, errno, "Out of memory");
588 return (ARCHIVE_FATAL);
589 }
590
591 if (*fd >= 0) {
592 #if ARCHIVE_XATTR_LINUX
593 list_size = flistxattr(*fd, list, list_size);
594 #elif ARCHIVE_XATTR_DARWIN
595 list_size = flistxattr(*fd, list, list_size, 0);
596 #elif ARCHIVE_XATTR_AIX
597 list_size = flistea(*fd, list, list_size);
598 #endif
599 } else if (!a->follow_symlinks) {
600 #if ARCHIVE_XATTR_LINUX
601 list_size = llistxattr(path, list, list_size);
602 #elif ARCHIVE_XATTR_DARWIN
603 list_size = listxattr(path, list, list_size, XATTR_NOFOLLOW);
604 #elif ARCHIVE_XATTR_AIX
605 list_size = llistea(path, list, list_size);
606 #endif
607 } else {
608 #if ARCHIVE_XATTR_LINUX
609 list_size = listxattr(path, list, list_size);
610 #elif ARCHIVE_XATTR_DARWIN
611 list_size = listxattr(path, list, list_size, 0);
612 #elif ARCHIVE_XATTR_AIX
613 list_size = listea(path, list, list_size);
614 #endif
615 }
616
617 if (list_size == -1) {
618 archive_set_error(&a->archive, errno,
619 "Couldn't retrieve extended attributes");
620 free(list);
621 return (ARCHIVE_WARN);
622 }
623
624 for (p = list; (p - list) < list_size; p += strlen(p) + 1) {
625 #if ARCHIVE_XATTR_LINUX
626 /* Linux: skip POSIX.1e ACL extended attributes */
627 if (strncmp(p, "system.", 7) == 0 &&
628 (strcmp(p + 7, "posix_acl_access") == 0 ||
629 strcmp(p + 7, "posix_acl_default") == 0))
630 continue;
631 if (strncmp(p, "trusted.SGI_", 12) == 0 &&
632 (strcmp(p + 12, "ACL_DEFAULT") == 0 ||
633 strcmp(p + 12, "ACL_FILE") == 0))
634 continue;
635
636 /* Linux: xfsroot namespace is obsolete and unsupported */
637 if (strncmp(p, "xfsroot.", 8) == 0)
638 continue;
639 #endif
640 setup_xattr(a, entry, p, *fd, path);
641 }
642
643 free(list);
644 return (ARCHIVE_OK);
645 }
646
647 #elif ARCHIVE_XATTR_FREEBSD
648
649 /*
650 * FreeBSD extattr interface.
651 */
652
653 /* TODO: Implement this. Follow the Linux model above, but
654 * with FreeBSD-specific system calls, of course. Be careful
655 * to not include the system extattrs that hold ACLs; we handle
656 * those separately.
657 */
658 static int
659 setup_xattr(struct archive_read_disk *a, struct archive_entry *entry,
660 int namespace, const char *name, const char *fullname, int fd,
661 const char *path);
662
663 static int
setup_xattr(struct archive_read_disk * a,struct archive_entry * entry,int namespace,const char * name,const char * fullname,int fd,const char * accpath)664 setup_xattr(struct archive_read_disk *a, struct archive_entry *entry,
665 int namespace, const char *name, const char *fullname, int fd,
666 const char *accpath)
667 {
668 ssize_t size;
669 void *value = NULL;
670
671 if (fd >= 0)
672 size = extattr_get_fd(fd, namespace, name, NULL, 0);
673 else if (!a->follow_symlinks)
674 size = extattr_get_link(accpath, namespace, name, NULL, 0);
675 else
676 size = extattr_get_file(accpath, namespace, name, NULL, 0);
677
678 if (size == -1) {
679 archive_set_error(&a->archive, errno,
680 "Couldn't query extended attribute");
681 return (ARCHIVE_WARN);
682 }
683
684 if (size > 0 && (value = malloc(size)) == NULL) {
685 archive_set_error(&a->archive, errno, "Out of memory");
686 return (ARCHIVE_FATAL);
687 }
688
689 if (fd >= 0)
690 size = extattr_get_fd(fd, namespace, name, value, size);
691 else if (!a->follow_symlinks)
692 size = extattr_get_link(accpath, namespace, name, value, size);
693 else
694 size = extattr_get_file(accpath, namespace, name, value, size);
695
696 if (size == -1) {
697 free(value);
698 archive_set_error(&a->archive, errno,
699 "Couldn't read extended attribute");
700 return (ARCHIVE_WARN);
701 }
702
703 archive_entry_xattr_add_entry(entry, fullname, value, size);
704
705 free(value);
706 return (ARCHIVE_OK);
707 }
708
709 static int
setup_xattrs_namespace(struct archive_read_disk * a,struct archive_entry * entry,int * fd,int namespace)710 setup_xattrs_namespace(struct archive_read_disk *a,
711 struct archive_entry *entry, int *fd, int namespace)
712 {
713 char buff[512];
714 char *list, *p;
715 ssize_t list_size;
716 const char *path;
717
718 path = NULL;
719
720 if (*fd < 0) {
721 path = archive_read_disk_entry_setup_path(a, entry, fd);
722 if (path == NULL)
723 return (ARCHIVE_WARN);
724 }
725
726 if (*fd >= 0)
727 list_size = extattr_list_fd(*fd, namespace, NULL, 0);
728 else if (!a->follow_symlinks)
729 list_size = extattr_list_link(path, namespace, NULL, 0);
730 else
731 list_size = extattr_list_file(path, namespace, NULL, 0);
732
733 if (list_size == -1 && errno == EOPNOTSUPP)
734 return (ARCHIVE_OK);
735 if (list_size == -1 && errno == EPERM)
736 return (ARCHIVE_OK);
737 if (list_size == -1) {
738 archive_set_error(&a->archive, errno,
739 "Couldn't list extended attributes");
740 return (ARCHIVE_WARN);
741 }
742
743 if (list_size == 0)
744 return (ARCHIVE_OK);
745
746 if ((list = malloc(list_size)) == NULL) {
747 archive_set_error(&a->archive, errno, "Out of memory");
748 return (ARCHIVE_FATAL);
749 }
750
751 if (*fd >= 0)
752 list_size = extattr_list_fd(*fd, namespace, list, list_size);
753 else if (!a->follow_symlinks)
754 list_size = extattr_list_link(path, namespace, list, list_size);
755 else
756 list_size = extattr_list_file(path, namespace, list, list_size);
757
758 if (list_size == -1) {
759 archive_set_error(&a->archive, errno,
760 "Couldn't retrieve extended attributes");
761 free(list);
762 return (ARCHIVE_WARN);
763 }
764
765 p = list;
766 while ((p - list) < list_size) {
767 size_t len = 255 & (int)*p;
768 char *name;
769
770 if (namespace == EXTATTR_NAMESPACE_SYSTEM) {
771 if (!strcmp(p + 1, "nfs4.acl") ||
772 !strcmp(p + 1, "posix1e.acl_access") ||
773 !strcmp(p + 1, "posix1e.acl_default")) {
774 p += 1 + len;
775 continue;
776 }
777 strcpy(buff, "system.");
778 } else {
779 strcpy(buff, "user.");
780 }
781 name = buff + strlen(buff);
782 memcpy(name, p + 1, len);
783 name[len] = '\0';
784 setup_xattr(a, entry, namespace, name, buff, *fd, path);
785 p += 1 + len;
786 }
787
788 free(list);
789 return (ARCHIVE_OK);
790 }
791
792 static int
setup_xattrs(struct archive_read_disk * a,struct archive_entry * entry,int * fd)793 setup_xattrs(struct archive_read_disk *a,
794 struct archive_entry *entry, int *fd)
795 {
796 int namespaces[2];
797 int i, res;
798
799 namespaces[0] = EXTATTR_NAMESPACE_USER;
800 namespaces[1] = EXTATTR_NAMESPACE_SYSTEM;
801
802 for (i = 0; i < 2; i++) {
803 res = setup_xattrs_namespace(a, entry, fd,
804 namespaces[i]);
805 switch (res) {
806 case (ARCHIVE_OK):
807 case (ARCHIVE_WARN):
808 break;
809 default:
810 return (res);
811 }
812 }
813
814 return (ARCHIVE_OK);
815 }
816
817 #else
818
819 /*
820 * Generic (stub) extended attribute support.
821 */
822 static int
setup_xattrs(struct archive_read_disk * a,struct archive_entry * entry,int * fd)823 setup_xattrs(struct archive_read_disk *a,
824 struct archive_entry *entry, int *fd)
825 {
826 (void)a; /* UNUSED */
827 (void)entry; /* UNUSED */
828 (void)fd; /* UNUSED */
829 return (ARCHIVE_OK);
830 }
831
832 #endif
833
834 #if defined(HAVE_LINUX_FIEMAP_H)
835
836 /*
837 * Linux FIEMAP sparse interface.
838 *
839 * The FIEMAP ioctl returns an "extent" for each physical allocation
840 * on disk. We need to process those to generate a more compact list
841 * of logical file blocks. We also need to be very careful to use
842 * FIEMAP_FLAG_SYNC here, since there are reports that Linux sometimes
843 * does not report allocations for newly-written data that hasn't
844 * been synced to disk.
845 *
846 * It's important to return a minimal sparse file list because we want
847 * to not trigger sparse file extensions if we don't have to, since
848 * not all readers support them.
849 */
850
851 static int
setup_sparse_fiemap(struct archive_read_disk * a,struct archive_entry * entry,int * fd)852 setup_sparse_fiemap(struct archive_read_disk *a,
853 struct archive_entry *entry, int *fd)
854 {
855 char buff[4096];
856 struct fiemap *fm;
857 struct fiemap_extent *fe;
858 int64_t size;
859 int count, do_fiemap, iters;
860 int exit_sts = ARCHIVE_OK;
861 const char *path;
862
863 if (archive_entry_filetype(entry) != AE_IFREG
864 || archive_entry_size(entry) <= 0
865 || archive_entry_hardlink(entry) != NULL)
866 return (ARCHIVE_OK);
867
868 if (*fd < 0) {
869 path = archive_read_disk_entry_setup_path(a, entry, NULL);
870 if (path == NULL)
871 return (ARCHIVE_FAILED);
872
873 if (a->tree != NULL)
874 *fd = a->open_on_current_dir(a->tree, path,
875 O_RDONLY | O_NONBLOCK | O_CLOEXEC);
876 else
877 *fd = open(path, O_RDONLY | O_NONBLOCK | O_CLOEXEC);
878 if (*fd < 0) {
879 archive_set_error(&a->archive, errno,
880 "Can't open `%s'", path);
881 return (ARCHIVE_FAILED);
882 }
883 __archive_ensure_cloexec_flag(*fd);
884 }
885
886 /* Initialize buffer to avoid the error valgrind complains about. */
887 memset(buff, 0, sizeof(buff));
888 count = (sizeof(buff) - sizeof(*fm))/sizeof(*fe);
889 fm = (struct fiemap *)buff;
890 fm->fm_start = 0;
891 fm->fm_length = ~0ULL;;
892 fm->fm_flags = FIEMAP_FLAG_SYNC;
893 fm->fm_extent_count = count;
894 do_fiemap = 1;
895 size = archive_entry_size(entry);
896 for (iters = 0; ; ++iters) {
897 int i, r;
898
899 r = ioctl(*fd, FS_IOC_FIEMAP, fm);
900 if (r < 0) {
901 /* When something error happens, it is better we
902 * should return ARCHIVE_OK because an earlier
903 * version(<2.6.28) cannot perform FS_IOC_FIEMAP. */
904 goto exit_setup_sparse_fiemap;
905 }
906 if (fm->fm_mapped_extents == 0) {
907 if (iters == 0) {
908 /* Fully sparse file; insert a zero-length "data" entry */
909 archive_entry_sparse_add_entry(entry, 0, 0);
910 }
911 break;
912 }
913 fe = fm->fm_extents;
914 for (i = 0; i < (int)fm->fm_mapped_extents; i++, fe++) {
915 if (!(fe->fe_flags & FIEMAP_EXTENT_UNWRITTEN)) {
916 /* The fe_length of the last block does not
917 * adjust itself to its size files. */
918 int64_t length = fe->fe_length;
919 if (fe->fe_logical + length > (uint64_t)size)
920 length -= fe->fe_logical + length - size;
921 if (fe->fe_logical == 0 && length == size) {
922 /* This is not sparse. */
923 do_fiemap = 0;
924 break;
925 }
926 if (length > 0)
927 archive_entry_sparse_add_entry(entry,
928 fe->fe_logical, length);
929 }
930 if (fe->fe_flags & FIEMAP_EXTENT_LAST)
931 do_fiemap = 0;
932 }
933 if (do_fiemap) {
934 fe = fm->fm_extents + fm->fm_mapped_extents -1;
935 fm->fm_start = fe->fe_logical + fe->fe_length;
936 } else
937 break;
938 }
939 exit_setup_sparse_fiemap:
940 return (exit_sts);
941 }
942
943 #if !defined(SEEK_HOLE) || !defined(SEEK_DATA)
944 static int
setup_sparse(struct archive_read_disk * a,struct archive_entry * entry,int * fd)945 setup_sparse(struct archive_read_disk *a,
946 struct archive_entry *entry, int *fd)
947 {
948 return setup_sparse_fiemap(a, entry, fd);
949 }
950 #endif
951 #endif /* defined(HAVE_LINUX_FIEMAP_H) */
952
953 #if defined(SEEK_HOLE) && defined(SEEK_DATA)
954
955 /*
956 * SEEK_HOLE sparse interface (FreeBSD, Linux, Solaris)
957 */
958
959 static int
setup_sparse(struct archive_read_disk * a,struct archive_entry * entry,int * fd)960 setup_sparse(struct archive_read_disk *a,
961 struct archive_entry *entry, int *fd)
962 {
963 int64_t size;
964 off_t initial_off;
965 off_t off_s, off_e;
966 int exit_sts = ARCHIVE_OK;
967 int check_fully_sparse = 0;
968 const char *path;
969
970 if (archive_entry_filetype(entry) != AE_IFREG
971 || archive_entry_size(entry) <= 0
972 || archive_entry_hardlink(entry) != NULL)
973 return (ARCHIVE_OK);
974
975 /* Does filesystem support the reporting of hole ? */
976 if (*fd < 0)
977 path = archive_read_disk_entry_setup_path(a, entry, fd);
978 else
979 path = NULL;
980
981 if (*fd >= 0) {
982 #ifdef _PC_MIN_HOLE_SIZE
983 if (fpathconf(*fd, _PC_MIN_HOLE_SIZE) <= 0)
984 return (ARCHIVE_OK);
985 #endif
986 initial_off = lseek(*fd, 0, SEEK_CUR);
987 if (initial_off != 0)
988 lseek(*fd, 0, SEEK_SET);
989 } else {
990 if (path == NULL)
991 return (ARCHIVE_FAILED);
992 #ifdef _PC_MIN_HOLE_SIZE
993 if (pathconf(path, _PC_MIN_HOLE_SIZE) <= 0)
994 return (ARCHIVE_OK);
995 #endif
996 *fd = open(path, O_RDONLY | O_NONBLOCK | O_CLOEXEC);
997 if (*fd < 0) {
998 archive_set_error(&a->archive, errno,
999 "Can't open `%s'", path);
1000 return (ARCHIVE_FAILED);
1001 }
1002 __archive_ensure_cloexec_flag(*fd);
1003 initial_off = 0;
1004 }
1005
1006 #ifndef _PC_MIN_HOLE_SIZE
1007 /* Check if the underlying filesystem supports seek hole */
1008 off_s = lseek(*fd, 0, SEEK_HOLE);
1009 if (off_s < 0)
1010 #if defined(HAVE_LINUX_FIEMAP_H)
1011 return setup_sparse_fiemap(a, entry, fd);
1012 #else
1013 goto exit_setup_sparse;
1014 #endif
1015 else if (off_s > 0)
1016 lseek(*fd, 0, SEEK_SET);
1017 #endif
1018
1019 off_s = 0;
1020 size = archive_entry_size(entry);
1021 while (off_s < size) {
1022 off_s = lseek(*fd, off_s, SEEK_DATA);
1023 if (off_s == (off_t)-1) {
1024 if (errno == ENXIO) {
1025 /* no more hole */
1026 if (archive_entry_sparse_count(entry) == 0) {
1027 /* Potentially a fully-sparse file. */
1028 check_fully_sparse = 1;
1029 }
1030 break;
1031 }
1032 archive_set_error(&a->archive, errno,
1033 "lseek(SEEK_HOLE) failed");
1034 exit_sts = ARCHIVE_FAILED;
1035 goto exit_setup_sparse;
1036 }
1037 off_e = lseek(*fd, off_s, SEEK_HOLE);
1038 if (off_e == (off_t)-1) {
1039 if (errno == ENXIO) {
1040 off_e = lseek(*fd, 0, SEEK_END);
1041 if (off_e != (off_t)-1)
1042 break;/* no more data */
1043 }
1044 archive_set_error(&a->archive, errno,
1045 "lseek(SEEK_DATA) failed");
1046 exit_sts = ARCHIVE_FAILED;
1047 goto exit_setup_sparse;
1048 }
1049 if (off_s == 0 && off_e == size)
1050 break;/* This is not sparse. */
1051 archive_entry_sparse_add_entry(entry, off_s,
1052 off_e - off_s);
1053 off_s = off_e;
1054 }
1055
1056 if (check_fully_sparse) {
1057 if (lseek(*fd, 0, SEEK_HOLE) == 0 &&
1058 lseek(*fd, 0, SEEK_END) == size) {
1059 /* Fully sparse file; insert a zero-length "data" entry */
1060 archive_entry_sparse_add_entry(entry, 0, 0);
1061 }
1062 }
1063 exit_setup_sparse:
1064 lseek(*fd, initial_off, SEEK_SET);
1065 return (exit_sts);
1066 }
1067
1068 #elif !defined(HAVE_LINUX_FIEMAP_H)
1069
1070 /*
1071 * Generic (stub) sparse support.
1072 */
1073 static int
setup_sparse(struct archive_read_disk * a,struct archive_entry * entry,int * fd)1074 setup_sparse(struct archive_read_disk *a,
1075 struct archive_entry *entry, int *fd)
1076 {
1077 (void)a; /* UNUSED */
1078 (void)entry; /* UNUSED */
1079 (void)fd; /* UNUSED */
1080 return (ARCHIVE_OK);
1081 }
1082
1083 #endif
1084
1085 #endif /* !defined(_WIN32) || defined(__CYGWIN__) */
1086
1087