1 /*-
2 * Copyright (c) 2003-2010 Tim Kientzle
3 * Copyright (c) 2011-2012 Michihiro NAKAJIMA
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer
11 * in this position and unchanged.
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 __FBSDID("$FreeBSD$");
30
31 #if defined(_WIN32) && !defined(__CYGWIN__)
32
33 #ifdef HAVE_SYS_TYPES_H
34 #include <sys/types.h>
35 #endif
36 #ifdef HAVE_SYS_UTIME_H
37 #include <sys/utime.h>
38 #endif
39 #ifdef HAVE_ERRNO_H
40 #include <errno.h>
41 #endif
42 #ifdef HAVE_FCNTL_H
43 #include <fcntl.h>
44 #endif
45 #ifdef HAVE_LIMITS_H
46 #include <limits.h>
47 #endif
48 #ifdef HAVE_STDLIB_H
49 #include <stdlib.h>
50 #endif
51 #include <winioctl.h>
52
53 /* TODO: Support Mac OS 'quarantine' feature. This is really just a
54 * standard tag to mark files that have been downloaded as "tainted".
55 * On Mac OS, we should mark the extracted files as tainted if the
56 * archive being read was tainted. Windows has a similar feature; we
57 * should investigate ways to support this generically. */
58
59 #include "archive.h"
60 #include "archive_acl_private.h"
61 #include "archive_string.h"
62 #include "archive_entry.h"
63 #include "archive_private.h"
64
65 #ifndef O_BINARY
66 #define O_BINARY 0
67 #endif
68 #ifndef IO_REPARSE_TAG_SYMLINK
69 /* Old SDKs do not provide IO_REPARSE_TAG_SYMLINK */
70 #define IO_REPARSE_TAG_SYMLINK 0xA000000CL
71 #endif
72
SetFilePointerEx_perso(HANDLE hFile,LARGE_INTEGER liDistanceToMove,PLARGE_INTEGER lpNewFilePointer,DWORD dwMoveMethod)73 static BOOL SetFilePointerEx_perso(HANDLE hFile,
74 LARGE_INTEGER liDistanceToMove,
75 PLARGE_INTEGER lpNewFilePointer,
76 DWORD dwMoveMethod)
77 {
78 LARGE_INTEGER li;
79 li.QuadPart = liDistanceToMove.QuadPart;
80 li.LowPart = SetFilePointer(
81 hFile, li.LowPart, &li.HighPart, dwMoveMethod);
82 if(lpNewFilePointer) {
83 lpNewFilePointer->QuadPart = li.QuadPart;
84 }
85 return li.LowPart != (DWORD)-1 || GetLastError() == NO_ERROR;
86 }
87
88 struct fixup_entry {
89 struct fixup_entry *next;
90 struct archive_acl acl;
91 mode_t mode;
92 int64_t atime;
93 int64_t birthtime;
94 int64_t mtime;
95 int64_t ctime;
96 unsigned long atime_nanos;
97 unsigned long birthtime_nanos;
98 unsigned long mtime_nanos;
99 unsigned long ctime_nanos;
100 unsigned long fflags_set;
101 int fixup; /* bitmask of what needs fixing */
102 wchar_t *name;
103 };
104
105 /*
106 * We use a bitmask to track which operations remain to be done for
107 * this file. In particular, this helps us avoid unnecessary
108 * operations when it's possible to take care of one step as a
109 * side-effect of another. For example, mkdir() can specify the mode
110 * for the newly-created object but symlink() cannot. This means we
111 * can skip chmod() if mkdir() succeeded, but we must explicitly
112 * chmod() if we're trying to create a directory that already exists
113 * (mkdir() failed) or if we're restoring a symlink. Similarly, we
114 * need to verify UID/GID before trying to restore SUID/SGID bits;
115 * that verification can occur explicitly through a stat() call or
116 * implicitly because of a successful chown() call.
117 */
118 #define TODO_MODE_FORCE 0x40000000
119 #define TODO_MODE_BASE 0x20000000
120 #define TODO_SUID 0x10000000
121 #define TODO_SUID_CHECK 0x08000000
122 #define TODO_SGID 0x04000000
123 #define TODO_SGID_CHECK 0x02000000
124 #define TODO_MODE (TODO_MODE_BASE|TODO_SUID|TODO_SGID)
125 #define TODO_TIMES ARCHIVE_EXTRACT_TIME
126 #define TODO_OWNER ARCHIVE_EXTRACT_OWNER
127 #define TODO_FFLAGS ARCHIVE_EXTRACT_FFLAGS
128 #define TODO_ACLS ARCHIVE_EXTRACT_ACL
129 #define TODO_XATTR ARCHIVE_EXTRACT_XATTR
130 #define TODO_MAC_METADATA ARCHIVE_EXTRACT_MAC_METADATA
131
132 struct archive_write_disk {
133 struct archive archive;
134
135 mode_t user_umask;
136 struct fixup_entry *fixup_list;
137 struct fixup_entry *current_fixup;
138 int64_t user_uid;
139 int skip_file_set;
140 int64_t skip_file_dev;
141 int64_t skip_file_ino;
142 time_t start_time;
143
144 int64_t (*lookup_gid)(void *private, const char *gname, int64_t gid);
145 void (*cleanup_gid)(void *private);
146 void *lookup_gid_data;
147 int64_t (*lookup_uid)(void *private, const char *uname, int64_t uid);
148 void (*cleanup_uid)(void *private);
149 void *lookup_uid_data;
150
151 /*
152 * Full path of last file to satisfy symlink checks.
153 */
154 struct archive_wstring path_safe;
155
156 /*
157 * Cached stat data from disk for the current entry.
158 * If this is valid, pst points to st. Otherwise,
159 * pst is null.
160 */
161 BY_HANDLE_FILE_INFORMATION st;
162 BY_HANDLE_FILE_INFORMATION *pst;
163
164 /* Information about the object being restored right now. */
165 struct archive_entry *entry; /* Entry being extracted. */
166 wchar_t *name; /* Name of entry, possibly edited. */
167 struct archive_wstring _name_data; /* backing store for 'name' */
168 wchar_t *tmpname; /* Temporary name */
169 struct archive_wstring _tmpname_data; /* backing store for 'tmpname' */
170 /* Tasks remaining for this object. */
171 int todo;
172 /* Tasks deferred until end-of-archive. */
173 int deferred;
174 /* Options requested by the client. */
175 int flags;
176 /* Handle for the file we're restoring. */
177 HANDLE fh;
178 /* Current offset for writing data to the file. */
179 int64_t offset;
180 /* Last offset actually written to disk. */
181 int64_t fd_offset;
182 /* Total bytes actually written to files. */
183 int64_t total_bytes_written;
184 /* Maximum size of file, -1 if unknown. */
185 int64_t filesize;
186 /* Dir we were in before this restore; only for deep paths. */
187 int restore_pwd;
188 /* Mode we should use for this entry; affected by _PERM and umask. */
189 mode_t mode;
190 /* UID/GID to use in restoring this entry. */
191 int64_t uid;
192 int64_t gid;
193 };
194
195 /*
196 * Default mode for dirs created automatically (will be modified by umask).
197 * Note that POSIX specifies 0777 for implicitly-created dirs, "modified
198 * by the process' file creation mask."
199 */
200 #define DEFAULT_DIR_MODE 0777
201 /*
202 * Dir modes are restored in two steps: During the extraction, the permissions
203 * in the archive are modified to match the following limits. During
204 * the post-extract fixup pass, the permissions from the archive are
205 * applied.
206 */
207 #define MINIMUM_DIR_MODE 0700
208 #define MAXIMUM_DIR_MODE 0775
209
210 static int disk_unlink(const wchar_t *);
211 static int disk_rmdir(const wchar_t *);
212 static int check_symlinks(struct archive_write_disk *);
213 static int create_filesystem_object(struct archive_write_disk *);
214 static struct fixup_entry *current_fixup(struct archive_write_disk *,
215 const wchar_t *pathname);
216 static int cleanup_pathname(struct archive_write_disk *);
217 static int create_dir(struct archive_write_disk *, wchar_t *);
218 static int create_parent_dir(struct archive_write_disk *, wchar_t *);
219 static int la_chmod(const wchar_t *, mode_t);
220 static int la_mktemp(struct archive_write_disk *);
221 static int older(BY_HANDLE_FILE_INFORMATION *, struct archive_entry *);
222 static int permissive_name_w(struct archive_write_disk *);
223 static int restore_entry(struct archive_write_disk *);
224 static int set_acls(struct archive_write_disk *, HANDLE h,
225 const wchar_t *, struct archive_acl *);
226 static int set_xattrs(struct archive_write_disk *);
227 static int clear_nochange_fflags(struct archive_write_disk *);
228 static int set_fflags(struct archive_write_disk *);
229 static int set_fflags_platform(const wchar_t *, unsigned long,
230 unsigned long);
231 static int set_ownership(struct archive_write_disk *);
232 static int set_mode(struct archive_write_disk *, int mode);
233 static int set_times(struct archive_write_disk *, HANDLE, int,
234 const wchar_t *, time_t, long, time_t, long, time_t,
235 long, time_t, long);
236 static int set_times_from_entry(struct archive_write_disk *);
237 static struct fixup_entry *sort_dir_list(struct fixup_entry *p);
238 static ssize_t write_data_block(struct archive_write_disk *,
239 const char *, size_t);
240
241 static struct archive_vtable *archive_write_disk_vtable(void);
242
243 static int _archive_write_disk_close(struct archive *);
244 static int _archive_write_disk_free(struct archive *);
245 static int _archive_write_disk_header(struct archive *,
246 struct archive_entry *);
247 static int64_t _archive_write_disk_filter_bytes(struct archive *, int);
248 static int _archive_write_disk_finish_entry(struct archive *);
249 static ssize_t _archive_write_disk_data(struct archive *, const void *,
250 size_t);
251 static ssize_t _archive_write_disk_data_block(struct archive *, const void *,
252 size_t, int64_t);
253
254 #define bhfi_dev(bhfi) ((bhfi)->dwVolumeSerialNumber)
255 /* Treat FileIndex as i-node. We should remove a sequence number
256 * which is high-16-bits of nFileIndexHigh. */
257 #define bhfi_ino(bhfi) \
258 ((((int64_t)((bhfi)->nFileIndexHigh & 0x0000FFFFUL)) << 32) \
259 + (bhfi)->nFileIndexLow)
260 #define bhfi_size(bhfi) \
261 ((((int64_t)(bhfi)->nFileSizeHigh) << 32) + (bhfi)->nFileSizeLow)
262
263 static int
file_information(struct archive_write_disk * a,wchar_t * path,BY_HANDLE_FILE_INFORMATION * st,mode_t * mode,int sim_lstat)264 file_information(struct archive_write_disk *a, wchar_t *path,
265 BY_HANDLE_FILE_INFORMATION *st, mode_t *mode, int sim_lstat)
266 {
267 HANDLE h;
268 int r;
269 DWORD flag = FILE_FLAG_BACKUP_SEMANTICS;
270 WIN32_FIND_DATAW findData;
271
272 if (sim_lstat || mode != NULL) {
273 h = FindFirstFileW(path, &findData);
274 if (h == INVALID_HANDLE_VALUE &&
275 GetLastError() == ERROR_INVALID_NAME) {
276 wchar_t *full;
277 full = __la_win_permissive_name_w(path);
278 h = FindFirstFileW(full, &findData);
279 free(full);
280 }
281 if (h == INVALID_HANDLE_VALUE) {
282 la_dosmaperr(GetLastError());
283 return (-1);
284 }
285 FindClose(h);
286 }
287
288 /* Is symlink file ? */
289 if (sim_lstat &&
290 ((findData.dwFileAttributes
291 & FILE_ATTRIBUTE_REPARSE_POINT) &&
292 (findData.dwReserved0 == IO_REPARSE_TAG_SYMLINK)))
293 flag |= FILE_FLAG_OPEN_REPARSE_POINT;
294
295 h = CreateFileW(a->name, 0, 0, NULL,
296 OPEN_EXISTING, flag, NULL);
297 if (h == INVALID_HANDLE_VALUE &&
298 GetLastError() == ERROR_INVALID_NAME) {
299 wchar_t *full;
300 full = __la_win_permissive_name_w(path);
301 h = CreateFileW(full, 0, 0, NULL,
302 OPEN_EXISTING, flag, NULL);
303 free(full);
304 }
305 if (h == INVALID_HANDLE_VALUE) {
306 la_dosmaperr(GetLastError());
307 return (-1);
308 }
309 r = GetFileInformationByHandle(h, st);
310 CloseHandle(h);
311 if (r == 0) {
312 la_dosmaperr(GetLastError());
313 return (-1);
314 }
315
316 if (mode == NULL)
317 return (0);
318
319 *mode = S_IRUSR | S_IRGRP | S_IROTH;
320 if ((st->dwFileAttributes & FILE_ATTRIBUTE_READONLY) == 0)
321 *mode |= S_IWUSR | S_IWGRP | S_IWOTH;
322 if ((st->dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) &&
323 findData.dwReserved0 == IO_REPARSE_TAG_SYMLINK)
324 *mode |= S_IFLNK;
325 else if (st->dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
326 *mode |= S_IFDIR | S_IXUSR | S_IXGRP | S_IXOTH;
327 else {
328 const wchar_t *p;
329
330 *mode |= S_IFREG;
331 p = wcsrchr(path, L'.');
332 if (p != NULL && wcslen(p) == 4) {
333 switch (p[1]) {
334 case L'B': case L'b':
335 if ((p[2] == L'A' || p[2] == L'a' ) &&
336 (p[3] == L'T' || p[3] == L't' ))
337 *mode |= S_IXUSR | S_IXGRP | S_IXOTH;
338 break;
339 case L'C': case L'c':
340 if (((p[2] == L'M' || p[2] == L'm' ) &&
341 (p[3] == L'D' || p[3] == L'd' )))
342 *mode |= S_IXUSR | S_IXGRP | S_IXOTH;
343 break;
344 case L'E': case L'e':
345 if ((p[2] == L'X' || p[2] == L'x' ) &&
346 (p[3] == L'E' || p[3] == L'e' ))
347 *mode |= S_IXUSR | S_IXGRP | S_IXOTH;
348 break;
349 default:
350 break;
351 }
352 }
353 }
354 return (0);
355 }
356
357 /*
358 * Note: The path, for example, "aa/a/../b../c" will be converted to "aa/c"
359 * by GetFullPathNameW() W32 API, which __la_win_permissive_name_w uses.
360 * It means we cannot handle multiple dirs in one archive_entry.
361 * So we have to make the full-pathname in another way, which does not
362 * break "../" path string.
363 */
364 static int
permissive_name_w(struct archive_write_disk * a)365 permissive_name_w(struct archive_write_disk *a)
366 {
367 wchar_t *wn, *wnp;
368 wchar_t *ws, *wsp;
369 DWORD l;
370
371 wnp = a->name;
372 if (wnp[0] == L'\\' && wnp[1] == L'\\' &&
373 wnp[2] == L'?' && wnp[3] == L'\\')
374 /* We have already a permissive name. */
375 return (0);
376
377 if (wnp[0] == L'\\' && wnp[1] == L'\\' &&
378 wnp[2] == L'.' && wnp[3] == L'\\') {
379 /* This is a device name */
380 if (((wnp[4] >= L'a' && wnp[4] <= L'z') ||
381 (wnp[4] >= L'A' && wnp[4] <= L'Z')) &&
382 wnp[5] == L':' && wnp[6] == L'\\') {
383 wnp[2] = L'?';/* Not device name. */
384 return (0);
385 }
386 }
387
388 /*
389 * A full-pathname starting with a drive name like "C:\abc".
390 */
391 if (((wnp[0] >= L'a' && wnp[0] <= L'z') ||
392 (wnp[0] >= L'A' && wnp[0] <= L'Z')) &&
393 wnp[1] == L':' && wnp[2] == L'\\') {
394 wn = _wcsdup(wnp);
395 if (wn == NULL)
396 return (-1);
397 archive_wstring_ensure(&(a->_name_data), 4 + wcslen(wn) + 1);
398 a->name = a->_name_data.s;
399 /* Prepend "\\?\" */
400 archive_wstrncpy(&(a->_name_data), L"\\\\?\\", 4);
401 archive_wstrcat(&(a->_name_data), wn);
402 free(wn);
403 return (0);
404 }
405
406 /*
407 * A full-pathname pointing to a network drive
408 * like "\\<server-name>\<share-name>\file".
409 */
410 if (wnp[0] == L'\\' && wnp[1] == L'\\' && wnp[2] != L'\\') {
411 const wchar_t *p = &wnp[2];
412
413 /* Skip server-name letters. */
414 while (*p != L'\\' && *p != L'\0')
415 ++p;
416 if (*p == L'\\') {
417 const wchar_t *rp = ++p;
418 /* Skip share-name letters. */
419 while (*p != L'\\' && *p != L'\0')
420 ++p;
421 if (*p == L'\\' && p != rp) {
422 /* Now, match patterns such as
423 * "\\server-name\share-name\" */
424 wn = _wcsdup(wnp);
425 if (wn == NULL)
426 return (-1);
427 archive_wstring_ensure(&(a->_name_data),
428 8 + wcslen(wn) + 1);
429 a->name = a->_name_data.s;
430 /* Prepend "\\?\UNC\" */
431 archive_wstrncpy(&(a->_name_data),
432 L"\\\\?\\UNC\\", 8);
433 archive_wstrcat(&(a->_name_data), wn+2);
434 free(wn);
435 return (0);
436 }
437 }
438 return (0);
439 }
440
441 /*
442 * Get current working directory.
443 */
444 l = GetCurrentDirectoryW(0, NULL);
445 if (l == 0)
446 return (-1);
447 ws = malloc(l * sizeof(wchar_t));
448 l = GetCurrentDirectoryW(l, ws);
449 if (l == 0) {
450 free(ws);
451 return (-1);
452 }
453 wsp = ws;
454
455 /*
456 * A full-pathname starting without a drive name like "\abc".
457 */
458 if (wnp[0] == L'\\') {
459 wn = _wcsdup(wnp);
460 if (wn == NULL)
461 return (-1);
462 archive_wstring_ensure(&(a->_name_data),
463 4 + 2 + wcslen(wn) + 1);
464 a->name = a->_name_data.s;
465 /* Prepend "\\?\" and drive name. */
466 archive_wstrncpy(&(a->_name_data), L"\\\\?\\", 4);
467 archive_wstrncat(&(a->_name_data), wsp, 2);
468 archive_wstrcat(&(a->_name_data), wn);
469 free(wsp);
470 free(wn);
471 return (0);
472 }
473
474 wn = _wcsdup(wnp);
475 if (wn == NULL)
476 return (-1);
477 archive_wstring_ensure(&(a->_name_data), 4 + l + 1 + wcslen(wn) + 1);
478 a->name = a->_name_data.s;
479 /* Prepend "\\?\" and drive name if not already added. */
480 if (l > 3 && wsp[0] == L'\\' && wsp[1] == L'\\' &&
481 wsp[2] == L'?' && wsp[3] == L'\\')
482 {
483 archive_wstrncpy(&(a->_name_data), wsp, l);
484 }
485 else if (l > 2 && wsp[0] == L'\\' && wsp[1] == L'\\' && wsp[2] != L'\\')
486 {
487 archive_wstrncpy(&(a->_name_data), L"\\\\?\\UNC\\", 8);
488 archive_wstrncat(&(a->_name_data), wsp+2, l-2);
489 }
490 else
491 {
492 archive_wstrncpy(&(a->_name_data), L"\\\\?\\", 4);
493 archive_wstrncat(&(a->_name_data), wsp, l);
494 }
495 archive_wstrncat(&(a->_name_data), L"\\", 1);
496 archive_wstrcat(&(a->_name_data), wn);
497 a->name = a->_name_data.s;
498 free(wsp);
499 free(wn);
500 return (0);
501 }
502
503 static int
la_chmod(const wchar_t * path,mode_t mode)504 la_chmod(const wchar_t *path, mode_t mode)
505 {
506 DWORD attr;
507 BOOL r;
508 wchar_t *fullname;
509 int ret = 0;
510
511 fullname = NULL;
512 attr = GetFileAttributesW(path);
513 if (attr == (DWORD)-1 &&
514 GetLastError() == ERROR_INVALID_NAME) {
515 fullname = __la_win_permissive_name_w(path);
516 attr = GetFileAttributesW(fullname);
517 }
518 if (attr == (DWORD)-1) {
519 la_dosmaperr(GetLastError());
520 ret = -1;
521 goto exit_chmode;
522 }
523 if (mode & _S_IWRITE)
524 attr &= ~FILE_ATTRIBUTE_READONLY;
525 else
526 attr |= FILE_ATTRIBUTE_READONLY;
527 if (fullname != NULL)
528 r = SetFileAttributesW(fullname, attr);
529 else
530 r = SetFileAttributesW(path, attr);
531 if (r == 0) {
532 la_dosmaperr(GetLastError());
533 ret = -1;
534 }
535 exit_chmode:
536 free(fullname);
537 return (ret);
538 }
539
540 static int
la_mktemp(struct archive_write_disk * a)541 la_mktemp(struct archive_write_disk *a)
542 {
543 int fd;
544 mode_t mode;
545
546 archive_wstring_empty(&(a->_tmpname_data));
547 archive_wstrcpy(&(a->_tmpname_data), a->name);
548 archive_wstrcat(&(a->_tmpname_data), L".XXXXXX");
549 a->tmpname = a->_tmpname_data.s;
550
551 fd = __archive_mkstemp(a->tmpname);
552 if (fd == -1)
553 return -1;
554
555 mode = a->mode & 0777 & ~a->user_umask;
556 if (la_chmod(a->tmpname, mode) == -1) {
557 la_dosmaperr(GetLastError());
558 _close(fd);
559 return -1;
560 }
561 return (fd);
562 }
563
564 static void *
la_GetFunctionKernel32(const char * name)565 la_GetFunctionKernel32(const char *name)
566 {
567 static HINSTANCE lib;
568 static int set;
569 if (!set) {
570 set = 1;
571 lib = LoadLibrary(TEXT("kernel32.dll"));
572 }
573 if (lib == NULL) {
574 fprintf(stderr, "Can't load kernel32.dll?!\n");
575 exit(1);
576 }
577 return (void *)GetProcAddress(lib, name);
578 }
579
580 static int
la_CreateHardLinkW(wchar_t * linkname,wchar_t * target)581 la_CreateHardLinkW(wchar_t *linkname, wchar_t *target)
582 {
583 static BOOLEAN (WINAPI *f)(LPWSTR, LPWSTR, LPSECURITY_ATTRIBUTES);
584 static int set;
585 BOOL ret;
586
587 if (!set) {
588 set = 1;
589 f = la_GetFunctionKernel32("CreateHardLinkW");
590 }
591 if (!f) {
592 errno = ENOTSUP;
593 return (0);
594 }
595 ret = (*f)(linkname, target, NULL);
596 if (!ret) {
597 /* Under windows 2000, it is necessary to remove
598 * the "\\?\" prefix. */
599 #define IS_UNC(name) ((name[0] == L'U' || name[0] == L'u') && \
600 (name[1] == L'N' || name[1] == L'n') && \
601 (name[2] == L'C' || name[2] == L'c') && \
602 name[3] == L'\\')
603 if (!wcsncmp(linkname,L"\\\\?\\", 4)) {
604 linkname += 4;
605 if (IS_UNC(linkname))
606 linkname += 4;
607 }
608 if (!wcsncmp(target,L"\\\\?\\", 4)) {
609 target += 4;
610 if (IS_UNC(target))
611 target += 4;
612 }
613 #undef IS_UNC
614 ret = (*f)(linkname, target, NULL);
615 }
616 return (ret);
617 }
618
619 /*
620 * Create file or directory symolic link
621 *
622 * If linktype is AE_SYMLINK_TYPE_UNDEFINED (or unknown), guess linktype from
623 * the link target
624 */
625 static int
la_CreateSymbolicLinkW(const wchar_t * linkname,const wchar_t * target,int linktype)626 la_CreateSymbolicLinkW(const wchar_t *linkname, const wchar_t *target,
627 int linktype) {
628 static BOOLEAN (WINAPI *f)(LPCWSTR, LPCWSTR, DWORD);
629 static int set;
630 wchar_t *ttarget, *p;
631 int len;
632 DWORD attrs = 0;
633 DWORD flags = 0;
634 DWORD newflags = 0;
635 BOOL ret = 0;
636
637 if (!set) {
638 set = 1;
639 f = la_GetFunctionKernel32("CreateSymbolicLinkW");
640 }
641 if (!f)
642 return (0);
643
644 len = wcslen(target);
645 if (len == 0) {
646 errno = EINVAL;
647 return(0);
648 }
649 /*
650 * When writing path targets, we need to translate slashes
651 * to backslashes
652 */
653 ttarget = malloc((len + 1) * sizeof(wchar_t));
654 if (ttarget == NULL)
655 return(0);
656
657 p = ttarget;
658
659 while(*target != L'\0') {
660 if (*target == L'/')
661 *p = L'\\';
662 else
663 *p = *target;
664 target++;
665 p++;
666 }
667 *p = L'\0';
668
669 /*
670 * In case of undefined symlink type we guess it from the target.
671 * If the target equals ".", "..", ends with a backslash or a
672 * backslash followed by "." or ".." we assume it is a directory
673 * symlink. In all other cases we assume a file symlink.
674 */
675 if (linktype != AE_SYMLINK_TYPE_FILE && (
676 linktype == AE_SYMLINK_TYPE_DIRECTORY ||
677 *(p - 1) == L'\\' || (*(p - 1) == L'.' && (
678 len == 1 || *(p - 2) == L'\\' || ( *(p - 2) == L'.' && (
679 len == 2 || *(p - 3) == L'\\')))))) {
680 #if defined(SYMBOLIC_LINK_FLAG_DIRECTORY)
681 flags |= SYMBOLIC_LINK_FLAG_DIRECTORY;
682 #else
683 flags |= 0x1;
684 #endif
685 }
686
687 #if defined(SYMBOLIC_LINK_FLAG_ALLOW_UNPRIVILEGED_CREATE)
688 newflags = flags | SYMBOLIC_LINK_FLAG_ALLOW_UNPRIVILEGED_CREATE;
689 #else
690 newflags = flags | 0x2;
691 #endif
692
693 /*
694 * Windows won't overwrite existing links
695 */
696 attrs = GetFileAttributesW(linkname);
697 if (attrs != INVALID_FILE_ATTRIBUTES) {
698 if (attrs & FILE_ATTRIBUTE_DIRECTORY)
699 disk_rmdir(linkname);
700 else
701 disk_unlink(linkname);
702 }
703
704 ret = (*f)(linkname, ttarget, newflags);
705 /*
706 * Prior to Windows 10 calling CreateSymbolicLinkW() will fail
707 * if SYMBOLIC_LINK_FLAG_ALLOW_UNPRIVILEGED_CREATE is set
708 */
709 if (!ret) {
710 ret = (*f)(linkname, ttarget, flags);
711 }
712 free(ttarget);
713 return (ret);
714 }
715
716 static int
la_ftruncate(HANDLE handle,int64_t length)717 la_ftruncate(HANDLE handle, int64_t length)
718 {
719 LARGE_INTEGER distance;
720
721 if (GetFileType(handle) != FILE_TYPE_DISK) {
722 errno = EBADF;
723 return (-1);
724 }
725 distance.QuadPart = length;
726 if (!SetFilePointerEx_perso(handle, distance, NULL, FILE_BEGIN)) {
727 la_dosmaperr(GetLastError());
728 return (-1);
729 }
730 if (!SetEndOfFile(handle)) {
731 la_dosmaperr(GetLastError());
732 return (-1);
733 }
734 return (0);
735 }
736
737 static int
lazy_stat(struct archive_write_disk * a)738 lazy_stat(struct archive_write_disk *a)
739 {
740 if (a->pst != NULL) {
741 /* Already have stat() data available. */
742 return (ARCHIVE_OK);
743 }
744 if (a->fh != INVALID_HANDLE_VALUE &&
745 GetFileInformationByHandle(a->fh, &a->st) == 0) {
746 a->pst = &a->st;
747 return (ARCHIVE_OK);
748 }
749
750 /*
751 * XXX At this point, symlinks should not be hit, otherwise
752 * XXX a race occurred. Do we want to check explicitly for that?
753 */
754 if (file_information(a, a->name, &a->st, NULL, 1) == 0) {
755 a->pst = &a->st;
756 return (ARCHIVE_OK);
757 }
758 archive_set_error(&a->archive, errno, "Couldn't stat file");
759 return (ARCHIVE_WARN);
760 }
761
762 static struct archive_vtable *
archive_write_disk_vtable(void)763 archive_write_disk_vtable(void)
764 {
765 static struct archive_vtable av;
766 static int inited = 0;
767
768 if (!inited) {
769 av.archive_close = _archive_write_disk_close;
770 av.archive_filter_bytes = _archive_write_disk_filter_bytes;
771 av.archive_free = _archive_write_disk_free;
772 av.archive_write_header = _archive_write_disk_header;
773 av.archive_write_finish_entry
774 = _archive_write_disk_finish_entry;
775 av.archive_write_data = _archive_write_disk_data;
776 av.archive_write_data_block = _archive_write_disk_data_block;
777 inited = 1;
778 }
779 return (&av);
780 }
781
782 static int64_t
_archive_write_disk_filter_bytes(struct archive * _a,int n)783 _archive_write_disk_filter_bytes(struct archive *_a, int n)
784 {
785 struct archive_write_disk *a = (struct archive_write_disk *)_a;
786 (void)n; /* UNUSED */
787 if (n == -1 || n == 0)
788 return (a->total_bytes_written);
789 return (-1);
790 }
791
792
793 int
archive_write_disk_set_options(struct archive * _a,int flags)794 archive_write_disk_set_options(struct archive *_a, int flags)
795 {
796 struct archive_write_disk *a = (struct archive_write_disk *)_a;
797
798 a->flags = flags;
799 return (ARCHIVE_OK);
800 }
801
802
803 /*
804 * Extract this entry to disk.
805 *
806 * TODO: Validate hardlinks. According to the standards, we're
807 * supposed to check each extracted hardlink and squawk if it refers
808 * to a file that we didn't restore. I'm not entirely convinced this
809 * is a good idea, but more importantly: Is there any way to validate
810 * hardlinks without keeping a complete list of filenames from the
811 * entire archive?? Ugh.
812 *
813 */
814 static int
_archive_write_disk_header(struct archive * _a,struct archive_entry * entry)815 _archive_write_disk_header(struct archive *_a, struct archive_entry *entry)
816 {
817 struct archive_write_disk *a = (struct archive_write_disk *)_a;
818 struct fixup_entry *fe;
819 int ret, r;
820
821 archive_check_magic(&a->archive, ARCHIVE_WRITE_DISK_MAGIC,
822 ARCHIVE_STATE_HEADER | ARCHIVE_STATE_DATA,
823 "archive_write_disk_header");
824 archive_clear_error(&a->archive);
825 if (a->archive.state & ARCHIVE_STATE_DATA) {
826 r = _archive_write_disk_finish_entry(&a->archive);
827 if (r == ARCHIVE_FATAL)
828 return (r);
829 }
830
831 /* Set up for this particular entry. */
832 a->pst = NULL;
833 a->current_fixup = NULL;
834 a->deferred = 0;
835 archive_entry_free(a->entry);
836 a->entry = NULL;
837 a->entry = archive_entry_clone(entry);
838 a->fh = INVALID_HANDLE_VALUE;
839 a->fd_offset = 0;
840 a->offset = 0;
841 a->restore_pwd = -1;
842 a->uid = a->user_uid;
843 a->mode = archive_entry_mode(a->entry);
844 if (archive_entry_size_is_set(a->entry))
845 a->filesize = archive_entry_size(a->entry);
846 else
847 a->filesize = -1;
848 archive_wstrcpy(&(a->_name_data), archive_entry_pathname_w(a->entry));
849 a->name = a->_name_data.s;
850 archive_clear_error(&a->archive);
851
852 /*
853 * Clean up the requested path. This is necessary for correct
854 * dir restores; the dir restore logic otherwise gets messed
855 * up by nonsense like "dir/.".
856 */
857 ret = cleanup_pathname(a);
858 if (ret != ARCHIVE_OK)
859 return (ret);
860
861 /*
862 * Generate a full-pathname and use it from here.
863 */
864 if (permissive_name_w(a) < 0) {
865 errno = EINVAL;
866 return (ARCHIVE_FAILED);
867 }
868
869 /*
870 * Query the umask so we get predictable mode settings.
871 * This gets done on every call to _write_header in case the
872 * user edits their umask during the extraction for some
873 * reason.
874 */
875 umask(a->user_umask = umask(0));
876
877 /* Figure out what we need to do for this entry. */
878 a->todo = TODO_MODE_BASE;
879 if (a->flags & ARCHIVE_EXTRACT_PERM) {
880 a->todo |= TODO_MODE_FORCE; /* Be pushy about permissions. */
881 /*
882 * SGID requires an extra "check" step because we
883 * cannot easily predict the GID that the system will
884 * assign. (Different systems assign GIDs to files
885 * based on a variety of criteria, including process
886 * credentials and the gid of the enclosing
887 * directory.) We can only restore the SGID bit if
888 * the file has the right GID, and we only know the
889 * GID if we either set it (see set_ownership) or if
890 * we've actually called stat() on the file after it
891 * was restored. Since there are several places at
892 * which we might verify the GID, we need a TODO bit
893 * to keep track.
894 */
895 if (a->mode & S_ISGID)
896 a->todo |= TODO_SGID | TODO_SGID_CHECK;
897 /*
898 * Verifying the SUID is simpler, but can still be
899 * done in multiple ways, hence the separate "check" bit.
900 */
901 if (a->mode & S_ISUID)
902 a->todo |= TODO_SUID | TODO_SUID_CHECK;
903 } else {
904 /*
905 * User didn't request full permissions, so don't
906 * restore SUID, SGID bits and obey umask.
907 */
908 a->mode &= ~S_ISUID;
909 a->mode &= ~S_ISGID;
910 a->mode &= ~S_ISVTX;
911 a->mode &= ~a->user_umask;
912 }
913 #if 0
914 if (a->flags & ARCHIVE_EXTRACT_OWNER)
915 a->todo |= TODO_OWNER;
916 #endif
917 if (a->flags & ARCHIVE_EXTRACT_TIME)
918 a->todo |= TODO_TIMES;
919 if (a->flags & ARCHIVE_EXTRACT_ACL) {
920 if (archive_entry_filetype(a->entry) == AE_IFDIR)
921 a->deferred |= TODO_ACLS;
922 else
923 a->todo |= TODO_ACLS;
924 }
925 if (a->flags & ARCHIVE_EXTRACT_XATTR)
926 a->todo |= TODO_XATTR;
927 if (a->flags & ARCHIVE_EXTRACT_FFLAGS)
928 a->todo |= TODO_FFLAGS;
929 if (a->flags & ARCHIVE_EXTRACT_SECURE_SYMLINKS) {
930 ret = check_symlinks(a);
931 if (ret != ARCHIVE_OK)
932 return (ret);
933 }
934
935 ret = restore_entry(a);
936
937 /*
938 * TODO: There are rumours that some extended attributes must
939 * be restored before file data is written. If this is true,
940 * then we either need to write all extended attributes both
941 * before and after restoring the data, or find some rule for
942 * determining which must go first and which last. Due to the
943 * many ways people are using xattrs, this may prove to be an
944 * intractable problem.
945 */
946
947 /*
948 * Fixup uses the unedited pathname from archive_entry_pathname(),
949 * because it is relative to the base dir and the edited path
950 * might be relative to some intermediate dir as a result of the
951 * deep restore logic.
952 */
953 if (a->deferred & TODO_MODE) {
954 fe = current_fixup(a, archive_entry_pathname_w(entry));
955 fe->fixup |= TODO_MODE_BASE;
956 fe->mode = a->mode;
957 }
958
959 if ((a->deferred & TODO_TIMES)
960 && (archive_entry_mtime_is_set(entry)
961 || archive_entry_atime_is_set(entry))) {
962 fe = current_fixup(a, archive_entry_pathname_w(entry));
963 fe->mode = a->mode;
964 fe->fixup |= TODO_TIMES;
965 if (archive_entry_atime_is_set(entry)) {
966 fe->atime = archive_entry_atime(entry);
967 fe->atime_nanos = archive_entry_atime_nsec(entry);
968 } else {
969 /* If atime is unset, use start time. */
970 fe->atime = a->start_time;
971 fe->atime_nanos = 0;
972 }
973 if (archive_entry_mtime_is_set(entry)) {
974 fe->mtime = archive_entry_mtime(entry);
975 fe->mtime_nanos = archive_entry_mtime_nsec(entry);
976 } else {
977 /* If mtime is unset, use start time. */
978 fe->mtime = a->start_time;
979 fe->mtime_nanos = 0;
980 }
981 if (archive_entry_birthtime_is_set(entry)) {
982 fe->birthtime = archive_entry_birthtime(entry);
983 fe->birthtime_nanos = archive_entry_birthtime_nsec(entry);
984 } else {
985 /* If birthtime is unset, use mtime. */
986 fe->birthtime = fe->mtime;
987 fe->birthtime_nanos = fe->mtime_nanos;
988 }
989 }
990
991 if (a->deferred & TODO_ACLS) {
992 fe = current_fixup(a, archive_entry_pathname_w(entry));
993 archive_acl_copy(&fe->acl, archive_entry_acl(entry));
994 }
995
996 if (a->deferred & TODO_FFLAGS) {
997 unsigned long set, clear;
998
999 fe = current_fixup(a, archive_entry_pathname_w(entry));
1000 archive_entry_fflags(entry, &set, &clear);
1001 fe->fflags_set = set;
1002 }
1003
1004 /*
1005 * On Windows, A creating sparse file requires a special mark.
1006 */
1007 if (a->fh != INVALID_HANDLE_VALUE &&
1008 archive_entry_sparse_count(entry) > 0) {
1009 int64_t base = 0, offset, length;
1010 int i, cnt = archive_entry_sparse_reset(entry);
1011 int sparse = 0;
1012
1013 for (i = 0; i < cnt; i++) {
1014 archive_entry_sparse_next(entry, &offset, &length);
1015 if (offset - base >= 4096) {
1016 sparse = 1;/* we have a hole. */
1017 break;
1018 }
1019 base = offset + length;
1020 }
1021 if (sparse) {
1022 DWORD dmy;
1023 /* Mark this file as sparse. */
1024 DeviceIoControl(a->fh, FSCTL_SET_SPARSE,
1025 NULL, 0, NULL, 0, &dmy, NULL);
1026 }
1027 }
1028
1029 /* We've created the object and are ready to pour data into it. */
1030 if (ret >= ARCHIVE_WARN)
1031 a->archive.state = ARCHIVE_STATE_DATA;
1032 /*
1033 * If it's not open, tell our client not to try writing.
1034 * In particular, dirs, links, etc, don't get written to.
1035 */
1036 if (a->fh == INVALID_HANDLE_VALUE) {
1037 archive_entry_set_size(entry, 0);
1038 a->filesize = 0;
1039 }
1040
1041 return (ret);
1042 }
1043
1044 int
archive_write_disk_set_skip_file(struct archive * _a,la_int64_t d,la_int64_t i)1045 archive_write_disk_set_skip_file(struct archive *_a, la_int64_t d, la_int64_t i)
1046 {
1047 struct archive_write_disk *a = (struct archive_write_disk *)_a;
1048 archive_check_magic(&a->archive, ARCHIVE_WRITE_DISK_MAGIC,
1049 ARCHIVE_STATE_ANY, "archive_write_disk_set_skip_file");
1050 a->skip_file_set = 1;
1051 a->skip_file_dev = d;
1052 a->skip_file_ino = i;
1053 return (ARCHIVE_OK);
1054 }
1055
1056 static ssize_t
write_data_block(struct archive_write_disk * a,const char * buff,size_t size)1057 write_data_block(struct archive_write_disk *a, const char *buff, size_t size)
1058 {
1059 OVERLAPPED ol;
1060 uint64_t start_size = size;
1061 DWORD bytes_written = 0;
1062 ssize_t block_size = 0, bytes_to_write;
1063
1064 if (size == 0)
1065 return (ARCHIVE_OK);
1066
1067 if (a->filesize == 0 || a->fh == INVALID_HANDLE_VALUE) {
1068 archive_set_error(&a->archive, 0,
1069 "Attempt to write to an empty file");
1070 return (ARCHIVE_WARN);
1071 }
1072
1073 if (a->flags & ARCHIVE_EXTRACT_SPARSE) {
1074 /* XXX TODO XXX Is there a more appropriate choice here ? */
1075 /* This needn't match the filesystem allocation size. */
1076 block_size = 16*1024;
1077 }
1078
1079 /* If this write would run beyond the file size, truncate it. */
1080 if (a->filesize >= 0 && (int64_t)(a->offset + size) > a->filesize)
1081 start_size = size = (size_t)(a->filesize - a->offset);
1082
1083 /* Write the data. */
1084 while (size > 0) {
1085 if (block_size == 0) {
1086 bytes_to_write = size;
1087 } else {
1088 /* We're sparsifying the file. */
1089 const char *p, *end;
1090 int64_t block_end;
1091
1092 /* Skip leading zero bytes. */
1093 for (p = buff, end = buff + size; p < end; ++p) {
1094 if (*p != '\0')
1095 break;
1096 }
1097 a->offset += p - buff;
1098 size -= p - buff;
1099 buff = p;
1100 if (size == 0)
1101 break;
1102
1103 /* Calculate next block boundary after offset. */
1104 block_end
1105 = (a->offset / block_size + 1) * block_size;
1106
1107 /* If the adjusted write would cross block boundary,
1108 * truncate it to the block boundary. */
1109 bytes_to_write = size;
1110 if (a->offset + bytes_to_write > block_end)
1111 bytes_to_write = (DWORD)(block_end - a->offset);
1112 }
1113 memset(&ol, 0, sizeof(ol));
1114 ol.Offset = (DWORD)(a->offset & 0xFFFFFFFF);
1115 ol.OffsetHigh = (DWORD)(a->offset >> 32);
1116 if (!WriteFile(a->fh, buff, (uint32_t)bytes_to_write,
1117 &bytes_written, &ol)) {
1118 DWORD lasterr;
1119
1120 lasterr = GetLastError();
1121 if (lasterr == ERROR_ACCESS_DENIED)
1122 errno = EBADF;
1123 else
1124 la_dosmaperr(lasterr);
1125 archive_set_error(&a->archive, errno, "Write failed");
1126 return (ARCHIVE_WARN);
1127 }
1128 buff += bytes_written;
1129 size -= bytes_written;
1130 a->total_bytes_written += bytes_written;
1131 a->offset += bytes_written;
1132 a->fd_offset = a->offset;
1133 }
1134 return ((ssize_t)(start_size - size));
1135 }
1136
1137 static ssize_t
_archive_write_disk_data_block(struct archive * _a,const void * buff,size_t size,int64_t offset)1138 _archive_write_disk_data_block(struct archive *_a,
1139 const void *buff, size_t size, int64_t offset)
1140 {
1141 struct archive_write_disk *a = (struct archive_write_disk *)_a;
1142 ssize_t r;
1143
1144 archive_check_magic(&a->archive, ARCHIVE_WRITE_DISK_MAGIC,
1145 ARCHIVE_STATE_DATA, "archive_write_data_block");
1146
1147 a->offset = offset;
1148 r = write_data_block(a, buff, size);
1149 if (r < ARCHIVE_OK)
1150 return (r);
1151 if ((size_t)r < size) {
1152 archive_set_error(&a->archive, 0,
1153 "Write request too large");
1154 return (ARCHIVE_WARN);
1155 }
1156 #if ARCHIVE_VERSION_NUMBER < 3999000
1157 return (ARCHIVE_OK);
1158 #else
1159 return (size);
1160 #endif
1161 }
1162
1163 static ssize_t
_archive_write_disk_data(struct archive * _a,const void * buff,size_t size)1164 _archive_write_disk_data(struct archive *_a, const void *buff, size_t size)
1165 {
1166 struct archive_write_disk *a = (struct archive_write_disk *)_a;
1167
1168 archive_check_magic(&a->archive, ARCHIVE_WRITE_DISK_MAGIC,
1169 ARCHIVE_STATE_DATA, "archive_write_data");
1170
1171 return (write_data_block(a, buff, size));
1172 }
1173
1174 static int
_archive_write_disk_finish_entry(struct archive * _a)1175 _archive_write_disk_finish_entry(struct archive *_a)
1176 {
1177 struct archive_write_disk *a = (struct archive_write_disk *)_a;
1178 int ret = ARCHIVE_OK;
1179
1180 archive_check_magic(&a->archive, ARCHIVE_WRITE_DISK_MAGIC,
1181 ARCHIVE_STATE_HEADER | ARCHIVE_STATE_DATA,
1182 "archive_write_finish_entry");
1183 if (a->archive.state & ARCHIVE_STATE_HEADER)
1184 return (ARCHIVE_OK);
1185 archive_clear_error(&a->archive);
1186
1187 /* Pad or truncate file to the right size. */
1188 if (a->fh == INVALID_HANDLE_VALUE) {
1189 /* There's no file. */
1190 } else if (a->filesize < 0) {
1191 /* File size is unknown, so we can't set the size. */
1192 } else if (a->fd_offset == a->filesize) {
1193 /* Last write ended at exactly the filesize; we're done. */
1194 /* Hopefully, this is the common case. */
1195 } else {
1196 if (la_ftruncate(a->fh, a->filesize) == -1) {
1197 archive_set_error(&a->archive, errno,
1198 "File size could not be restored");
1199 return (ARCHIVE_FAILED);
1200 }
1201 }
1202
1203 /* Restore metadata. */
1204
1205 /*
1206 * Look up the "real" UID only if we're going to need it.
1207 * TODO: the TODO_SGID condition can be dropped here, can't it?
1208 */
1209 if (a->todo & (TODO_OWNER | TODO_SUID | TODO_SGID)) {
1210 a->uid = archive_write_disk_uid(&a->archive,
1211 archive_entry_uname(a->entry),
1212 archive_entry_uid(a->entry));
1213 }
1214 /* Look up the "real" GID only if we're going to need it. */
1215 /* TODO: the TODO_SUID condition can be dropped here, can't it? */
1216 if (a->todo & (TODO_OWNER | TODO_SGID | TODO_SUID)) {
1217 a->gid = archive_write_disk_gid(&a->archive,
1218 archive_entry_gname(a->entry),
1219 archive_entry_gid(a->entry));
1220 }
1221
1222 /*
1223 * Restore ownership before set_mode tries to restore suid/sgid
1224 * bits. If we set the owner, we know what it is and can skip
1225 * a stat() call to examine the ownership of the file on disk.
1226 */
1227 if (a->todo & TODO_OWNER)
1228 ret = set_ownership(a);
1229
1230 /*
1231 * set_mode must precede ACLs on systems such as Solaris and
1232 * FreeBSD where setting the mode implicitly clears extended ACLs
1233 */
1234 if (a->todo & TODO_MODE) {
1235 int r2 = set_mode(a, a->mode);
1236 if (r2 < ret) ret = r2;
1237 }
1238
1239 /*
1240 * Security-related extended attributes (such as
1241 * security.capability on Linux) have to be restored last,
1242 * since they're implicitly removed by other file changes.
1243 */
1244 if (a->todo & TODO_XATTR) {
1245 int r2 = set_xattrs(a);
1246 if (r2 < ret) ret = r2;
1247 }
1248
1249 /*
1250 * Some flags prevent file modification; they must be restored after
1251 * file contents are written.
1252 */
1253 if (a->todo & TODO_FFLAGS) {
1254 int r2 = set_fflags(a);
1255 if (r2 < ret) ret = r2;
1256 }
1257
1258 /*
1259 * Time must follow most other metadata;
1260 * otherwise atime will get changed.
1261 */
1262 if (a->todo & TODO_TIMES) {
1263 int r2 = set_times_from_entry(a);
1264 if (r2 < ret) ret = r2;
1265 }
1266
1267 /*
1268 * ACLs must be restored after timestamps because there are
1269 * ACLs that prevent attribute changes (including time).
1270 */
1271 if (a->todo & TODO_ACLS) {
1272 int r2 = set_acls(a, a->fh,
1273 archive_entry_pathname_w(a->entry),
1274 archive_entry_acl(a->entry));
1275 if (r2 < ret) ret = r2;
1276 }
1277
1278 /* If there's an fd, we can close it now. */
1279 if (a->fh != INVALID_HANDLE_VALUE) {
1280 CloseHandle(a->fh);
1281 a->fh = INVALID_HANDLE_VALUE;
1282 if (a->tmpname) {
1283 /* Windows does not support atomic rename */
1284 disk_unlink(a->name);
1285 if (_wrename(a->tmpname, a->name) != 0) {
1286 la_dosmaperr(GetLastError());
1287 archive_set_error(&a->archive, errno,
1288 "Failed to rename temporary file");
1289 ret = ARCHIVE_FAILED;
1290 disk_unlink(a->tmpname);
1291 }
1292 a->tmpname = NULL;
1293 }
1294 }
1295 /* If there's an entry, we can release it now. */
1296 archive_entry_free(a->entry);
1297 a->entry = NULL;
1298 a->archive.state = ARCHIVE_STATE_HEADER;
1299 return (ret);
1300 }
1301
1302 int
archive_write_disk_set_group_lookup(struct archive * _a,void * private_data,la_int64_t (* lookup_gid)(void * private,const char * gname,la_int64_t gid),void (* cleanup_gid)(void * private))1303 archive_write_disk_set_group_lookup(struct archive *_a,
1304 void *private_data,
1305 la_int64_t (*lookup_gid)(void *private, const char *gname, la_int64_t gid),
1306 void (*cleanup_gid)(void *private))
1307 {
1308 struct archive_write_disk *a = (struct archive_write_disk *)_a;
1309 archive_check_magic(&a->archive, ARCHIVE_WRITE_DISK_MAGIC,
1310 ARCHIVE_STATE_ANY, "archive_write_disk_set_group_lookup");
1311
1312 if (a->cleanup_gid != NULL && a->lookup_gid_data != NULL)
1313 (a->cleanup_gid)(a->lookup_gid_data);
1314
1315 a->lookup_gid = lookup_gid;
1316 a->cleanup_gid = cleanup_gid;
1317 a->lookup_gid_data = private_data;
1318 return (ARCHIVE_OK);
1319 }
1320
1321 int
archive_write_disk_set_user_lookup(struct archive * _a,void * private_data,int64_t (* lookup_uid)(void * private,const char * uname,int64_t uid),void (* cleanup_uid)(void * private))1322 archive_write_disk_set_user_lookup(struct archive *_a,
1323 void *private_data,
1324 int64_t (*lookup_uid)(void *private, const char *uname, int64_t uid),
1325 void (*cleanup_uid)(void *private))
1326 {
1327 struct archive_write_disk *a = (struct archive_write_disk *)_a;
1328 archive_check_magic(&a->archive, ARCHIVE_WRITE_DISK_MAGIC,
1329 ARCHIVE_STATE_ANY, "archive_write_disk_set_user_lookup");
1330
1331 if (a->cleanup_uid != NULL && a->lookup_uid_data != NULL)
1332 (a->cleanup_uid)(a->lookup_uid_data);
1333
1334 a->lookup_uid = lookup_uid;
1335 a->cleanup_uid = cleanup_uid;
1336 a->lookup_uid_data = private_data;
1337 return (ARCHIVE_OK);
1338 }
1339
1340 int64_t
archive_write_disk_gid(struct archive * _a,const char * name,la_int64_t id)1341 archive_write_disk_gid(struct archive *_a, const char *name, la_int64_t id)
1342 {
1343 struct archive_write_disk *a = (struct archive_write_disk *)_a;
1344 archive_check_magic(&a->archive, ARCHIVE_WRITE_DISK_MAGIC,
1345 ARCHIVE_STATE_ANY, "archive_write_disk_gid");
1346 if (a->lookup_gid)
1347 return (a->lookup_gid)(a->lookup_gid_data, name, id);
1348 return (id);
1349 }
1350
1351 int64_t
archive_write_disk_uid(struct archive * _a,const char * name,la_int64_t id)1352 archive_write_disk_uid(struct archive *_a, const char *name, la_int64_t id)
1353 {
1354 struct archive_write_disk *a = (struct archive_write_disk *)_a;
1355 archive_check_magic(&a->archive, ARCHIVE_WRITE_DISK_MAGIC,
1356 ARCHIVE_STATE_ANY, "archive_write_disk_uid");
1357 if (a->lookup_uid)
1358 return (a->lookup_uid)(a->lookup_uid_data, name, id);
1359 return (id);
1360 }
1361
1362 /*
1363 * Create a new archive_write_disk object and initialize it with global state.
1364 */
1365 struct archive *
archive_write_disk_new(void)1366 archive_write_disk_new(void)
1367 {
1368 struct archive_write_disk *a;
1369
1370 a = (struct archive_write_disk *)calloc(1, sizeof(*a));
1371 if (a == NULL)
1372 return (NULL);
1373 a->archive.magic = ARCHIVE_WRITE_DISK_MAGIC;
1374 /* We're ready to write a header immediately. */
1375 a->archive.state = ARCHIVE_STATE_HEADER;
1376 a->archive.vtable = archive_write_disk_vtable();
1377 a->start_time = time(NULL);
1378 /* Query and restore the umask. */
1379 umask(a->user_umask = umask(0));
1380 if (archive_wstring_ensure(&a->path_safe, 512) == NULL) {
1381 free(a);
1382 return (NULL);
1383 }
1384 return (&a->archive);
1385 }
1386
1387 static int
disk_unlink(const wchar_t * path)1388 disk_unlink(const wchar_t *path)
1389 {
1390 wchar_t *fullname;
1391 int r;
1392
1393 r = _wunlink(path);
1394 if (r != 0 && GetLastError() == ERROR_INVALID_NAME) {
1395 fullname = __la_win_permissive_name_w(path);
1396 r = _wunlink(fullname);
1397 free(fullname);
1398 }
1399 return (r);
1400 }
1401
1402 static int
disk_rmdir(const wchar_t * path)1403 disk_rmdir(const wchar_t *path)
1404 {
1405 wchar_t *fullname;
1406 int r;
1407
1408 r = _wrmdir(path);
1409 if (r != 0 && GetLastError() == ERROR_INVALID_NAME) {
1410 fullname = __la_win_permissive_name_w(path);
1411 r = _wrmdir(fullname);
1412 free(fullname);
1413 }
1414 return (r);
1415 }
1416
1417 /*
1418 * The main restore function.
1419 */
1420 static int
restore_entry(struct archive_write_disk * a)1421 restore_entry(struct archive_write_disk *a)
1422 {
1423 int ret = ARCHIVE_OK, en;
1424
1425 if (a->flags & ARCHIVE_EXTRACT_UNLINK && !S_ISDIR(a->mode)) {
1426 /*
1427 * TODO: Fix this. Apparently, there are platforms
1428 * that still allow root to hose the entire filesystem
1429 * by unlinking a dir. The S_ISDIR() test above
1430 * prevents us from using unlink() here if the new
1431 * object is a dir, but that doesn't mean the old
1432 * object isn't a dir.
1433 */
1434 if (a->flags & ARCHIVE_EXTRACT_CLEAR_NOCHANGE_FFLAGS)
1435 (void)clear_nochange_fflags(a);
1436 if (disk_unlink(a->name) == 0) {
1437 /* We removed it, reset cached stat. */
1438 a->pst = NULL;
1439 } else if (errno == ENOENT) {
1440 /* File didn't exist, that's just as good. */
1441 } else if (disk_rmdir(a->name) == 0) {
1442 /* It was a dir, but now it's gone. */
1443 a->pst = NULL;
1444 } else {
1445 /* We tried, but couldn't get rid of it. */
1446 archive_set_error(&a->archive, errno,
1447 "Could not unlink");
1448 return(ARCHIVE_FAILED);
1449 }
1450 }
1451
1452 /* Try creating it first; if this fails, we'll try to recover. */
1453 en = create_filesystem_object(a);
1454
1455 if ((en == ENOTDIR || en == ENOENT)
1456 && !(a->flags & ARCHIVE_EXTRACT_NO_AUTODIR)) {
1457 wchar_t *full;
1458 /* If the parent dir doesn't exist, try creating it. */
1459 create_parent_dir(a, a->name);
1460 /* Now try to create the object again. */
1461 full = __la_win_permissive_name_w(a->name);
1462 if (full == NULL) {
1463 en = EINVAL;
1464 } else {
1465 /* Remove multiple directories such as "a/../b../c" */
1466 archive_wstrcpy(&(a->_name_data), full);
1467 a->name = a->_name_data.s;
1468 free(full);
1469 en = create_filesystem_object(a);
1470 }
1471 }
1472
1473 if ((en == ENOENT) && (archive_entry_hardlink(a->entry) != NULL)) {
1474 archive_set_error(&a->archive, en,
1475 "Hard-link target '%s' does not exist.",
1476 archive_entry_hardlink(a->entry));
1477 return (ARCHIVE_FAILED);
1478 }
1479
1480 if ((en == EISDIR || en == EEXIST)
1481 && (a->flags & ARCHIVE_EXTRACT_NO_OVERWRITE)) {
1482 /* If we're not overwriting, we're done. */
1483 if (S_ISDIR(a->mode)) {
1484 /* Don't overwrite any settings on existing directories. */
1485 a->todo = 0;
1486 }
1487 archive_entry_unset_size(a->entry);
1488 return (ARCHIVE_OK);
1489 }
1490
1491 /*
1492 * Some platforms return EISDIR if you call
1493 * open(O_WRONLY | O_EXCL | O_CREAT) on a directory, some
1494 * return EEXIST. POSIX is ambiguous, requiring EISDIR
1495 * for open(O_WRONLY) on a dir and EEXIST for open(O_EXCL | O_CREAT)
1496 * on an existing item.
1497 */
1498 if (en == EISDIR) {
1499 /* A dir is in the way of a non-dir, rmdir it. */
1500 if (disk_rmdir(a->name) != 0) {
1501 archive_set_error(&a->archive, errno,
1502 "Can't remove already-existing dir");
1503 return (ARCHIVE_FAILED);
1504 }
1505 a->pst = NULL;
1506 /* Try again. */
1507 en = create_filesystem_object(a);
1508 } else if (en == EEXIST) {
1509 mode_t st_mode;
1510 mode_t lst_mode;
1511 BY_HANDLE_FILE_INFORMATION lst;
1512 /*
1513 * We know something is in the way, but we don't know what;
1514 * we need to find out before we go any further.
1515 */
1516 int r = 0;
1517 int dirlnk = 0;
1518
1519 /*
1520 * The SECURE_SYMLINK logic has already removed a
1521 * symlink to a dir if the client wants that. So
1522 * follow the symlink if we're creating a dir.
1523 * If it's not a dir (or it's a broken symlink),
1524 * then don't follow it.
1525 *
1526 * Windows distinguishes file and directory symlinks.
1527 * A file symlink may erroneously point to a directory
1528 * and a directory symlink to a file. Windows does not follow
1529 * such symlinks. We always need both source and target
1530 * information.
1531 */
1532 r = file_information(a, a->name, &lst, &lst_mode, 1);
1533 if (r != 0) {
1534 archive_set_error(&a->archive, errno,
1535 "Can't stat existing object");
1536 return (ARCHIVE_FAILED);
1537 } else if (S_ISLNK(lst_mode)) {
1538 if (lst.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
1539 dirlnk = 1;
1540 /* In case of a symlink we need target information */
1541 r = file_information(a, a->name, &a->st, &st_mode, 0);
1542 if (r != 0) {
1543 a->st = lst;
1544 st_mode = lst_mode;
1545 }
1546 } else {
1547 a->st = lst;
1548 st_mode = lst_mode;
1549 }
1550
1551 /*
1552 * NO_OVERWRITE_NEWER doesn't apply to directories.
1553 */
1554 if ((a->flags & ARCHIVE_EXTRACT_NO_OVERWRITE_NEWER)
1555 && !S_ISDIR(st_mode)) {
1556 if (!older(&(a->st), a->entry)) {
1557 archive_entry_unset_size(a->entry);
1558 return (ARCHIVE_OK);
1559 }
1560 }
1561
1562 /* If it's our archive, we're done. */
1563 if (a->skip_file_set &&
1564 bhfi_dev(&a->st) == a->skip_file_dev &&
1565 bhfi_ino(&a->st) == a->skip_file_ino) {
1566 archive_set_error(&a->archive, 0,
1567 "Refusing to overwrite archive");
1568 return (ARCHIVE_FAILED);
1569 }
1570
1571 if (!S_ISDIR(st_mode)) {
1572 if (a->flags &
1573 ARCHIVE_EXTRACT_CLEAR_NOCHANGE_FFLAGS) {
1574 (void)clear_nochange_fflags(a);
1575 }
1576 if ((a->flags & ARCHIVE_EXTRACT_SAFE_WRITES) &&
1577 S_ISREG(st_mode)) {
1578 int fd = la_mktemp(a);
1579
1580 if (fd == -1) {
1581 la_dosmaperr(GetLastError());
1582 archive_set_error(&a->archive, errno,
1583 "Can't create temporary file");
1584 return (ARCHIVE_FAILED);
1585 }
1586 a->fh = (HANDLE)_get_osfhandle(fd);
1587 if (a->fh == INVALID_HANDLE_VALUE) {
1588 la_dosmaperr(GetLastError());
1589 return (ARCHIVE_FAILED);
1590 }
1591 a->pst = NULL;
1592 en = 0;
1593 } else {
1594 if (dirlnk) {
1595 /* Edge case: dir symlink pointing
1596 * to a file */
1597 if (disk_rmdir(a->name) != 0) {
1598 archive_set_error(&a->archive,
1599 errno, "Can't unlink "
1600 "directory symlink");
1601 return (ARCHIVE_FAILED);
1602 }
1603 } else {
1604 if (disk_unlink(a->name) != 0) {
1605 /* A non-dir is in the way,
1606 * unlink it. */
1607 archive_set_error(&a->archive,
1608 errno, "Can't unlink "
1609 "already-existing object");
1610 return (ARCHIVE_FAILED);
1611 }
1612 }
1613 a->pst = NULL;
1614 /* Try again. */
1615 en = create_filesystem_object(a);
1616 }
1617 } else if (!S_ISDIR(a->mode)) {
1618 /* A dir is in the way of a non-dir, rmdir it. */
1619 if (a->flags & ARCHIVE_EXTRACT_CLEAR_NOCHANGE_FFLAGS)
1620 (void)clear_nochange_fflags(a);
1621 if (disk_rmdir(a->name) != 0) {
1622 archive_set_error(&a->archive, errno,
1623 "Can't remove already-existing dir");
1624 return (ARCHIVE_FAILED);
1625 }
1626 /* Try again. */
1627 en = create_filesystem_object(a);
1628 } else {
1629 /*
1630 * There's a dir in the way of a dir. Don't
1631 * waste time with rmdir()/mkdir(), just fix
1632 * up the permissions on the existing dir.
1633 * Note that we don't change perms on existing
1634 * dirs unless _EXTRACT_PERM is specified.
1635 */
1636 if ((a->mode != st_mode)
1637 && (a->todo & TODO_MODE_FORCE))
1638 a->deferred |= (a->todo & TODO_MODE);
1639 /* Ownership doesn't need deferred fixup. */
1640 en = 0; /* Forget the EEXIST. */
1641 }
1642 }
1643
1644 if (en) {
1645 /* Everything failed; give up here. */
1646 archive_set_error(&a->archive, en, "Can't create '%ls'",
1647 a->name);
1648 return (ARCHIVE_FAILED);
1649 }
1650
1651 a->pst = NULL; /* Cached stat data no longer valid. */
1652 return (ret);
1653 }
1654
1655 /*
1656 * Returns 0 if creation succeeds, or else returns errno value from
1657 * the failed system call. Note: This function should only ever perform
1658 * a single system call.
1659 */
1660 static int
create_filesystem_object(struct archive_write_disk * a)1661 create_filesystem_object(struct archive_write_disk *a)
1662 {
1663 /* Create the entry. */
1664 const wchar_t *linkname;
1665 wchar_t *fullname;
1666 mode_t final_mode, mode;
1667 int r;
1668 DWORD attrs = 0;
1669
1670 /* We identify hard/symlinks according to the link names. */
1671 /* Since link(2) and symlink(2) don't handle modes, we're done here. */
1672 linkname = archive_entry_hardlink_w(a->entry);
1673 if (linkname != NULL) {
1674 wchar_t *linkfull, *namefull;
1675
1676 linkfull = __la_win_permissive_name_w(linkname);
1677 namefull = __la_win_permissive_name_w(a->name);
1678 if (linkfull == NULL || namefull == NULL) {
1679 errno = EINVAL;
1680 r = -1;
1681 } else {
1682 /*
1683 * Unlinking and linking here is really not atomic,
1684 * but doing it right, would require us to construct
1685 * an mktemplink() function, and then use _wrename().
1686 */
1687 if (a->flags & ARCHIVE_EXTRACT_SAFE_WRITES) {
1688 attrs = GetFileAttributesW(namefull);
1689 if (attrs != INVALID_FILE_ATTRIBUTES) {
1690 if (attrs & FILE_ATTRIBUTE_DIRECTORY)
1691 disk_rmdir(namefull);
1692 else
1693 disk_unlink(namefull);
1694 }
1695 }
1696 r = la_CreateHardLinkW(namefull, linkfull);
1697 if (r == 0) {
1698 la_dosmaperr(GetLastError());
1699 r = errno;
1700 } else
1701 r = 0;
1702 }
1703 /*
1704 * New cpio and pax formats allow hardlink entries
1705 * to carry data, so we may have to open the file
1706 * for hardlink entries.
1707 *
1708 * If the hardlink was successfully created and
1709 * the archive doesn't have carry data for it,
1710 * consider it to be non-authoritative for meta data.
1711 * This is consistent with GNU tar and BSD pax.
1712 * If the hardlink does carry data, let the last
1713 * archive entry decide ownership.
1714 */
1715 if (r == 0 && a->filesize <= 0) {
1716 a->todo = 0;
1717 a->deferred = 0;
1718 } else if (r == 0 && a->filesize > 0) {
1719 a->fh = CreateFileW(namefull, GENERIC_WRITE, 0, NULL,
1720 TRUNCATE_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
1721 if (a->fh == INVALID_HANDLE_VALUE) {
1722 la_dosmaperr(GetLastError());
1723 r = errno;
1724 }
1725 }
1726 free(linkfull);
1727 free(namefull);
1728 return (r);
1729 }
1730 linkname = archive_entry_symlink_w(a->entry);
1731 if (linkname != NULL) {
1732 /*
1733 * Unlinking and linking here is really not atomic,
1734 * but doing it right, would require us to construct
1735 * an mktemplink() function, and then use _wrename().
1736 */
1737 attrs = GetFileAttributesW(a->name);
1738 if (attrs != INVALID_FILE_ATTRIBUTES) {
1739 if (attrs & FILE_ATTRIBUTE_DIRECTORY)
1740 disk_rmdir(a->name);
1741 else
1742 disk_unlink(a->name);
1743 }
1744 #if HAVE_SYMLINK
1745 return symlink(linkname, a->name) ? errno : 0;
1746 #else
1747 errno = 0;
1748 r = la_CreateSymbolicLinkW((const wchar_t *)a->name, linkname,
1749 archive_entry_symlink_type(a->entry));
1750 if (r == 0) {
1751 if (errno == 0)
1752 la_dosmaperr(GetLastError());
1753 r = errno;
1754 } else
1755 r = 0;
1756 return (r);
1757 #endif
1758 }
1759
1760 /*
1761 * The remaining system calls all set permissions, so let's
1762 * try to take advantage of that to avoid an extra chmod()
1763 * call. (Recall that umask is set to zero right now!)
1764 */
1765
1766 /* Mode we want for the final restored object (w/o file type bits). */
1767 final_mode = a->mode & 07777;
1768 /*
1769 * The mode that will actually be restored in this step. Note
1770 * that SUID, SGID, etc, require additional work to ensure
1771 * security, so we never restore them at this point.
1772 */
1773 mode = final_mode & 0777 & ~a->user_umask;
1774
1775 switch (a->mode & AE_IFMT) {
1776 default:
1777 /* POSIX requires that we fall through here. */
1778 /* FALLTHROUGH */
1779 case AE_IFREG:
1780 a->tmpname = NULL;
1781 fullname = a->name;
1782 /* O_WRONLY | O_CREAT | O_EXCL */
1783 a->fh = CreateFileW(fullname, GENERIC_WRITE, 0, NULL,
1784 CREATE_NEW, FILE_ATTRIBUTE_NORMAL, NULL);
1785 if (a->fh == INVALID_HANDLE_VALUE &&
1786 GetLastError() == ERROR_INVALID_NAME &&
1787 fullname == a->name) {
1788 fullname = __la_win_permissive_name_w(a->name);
1789 a->fh = CreateFileW(fullname, GENERIC_WRITE, 0, NULL,
1790 CREATE_NEW, FILE_ATTRIBUTE_NORMAL, NULL);
1791 }
1792 if (a->fh == INVALID_HANDLE_VALUE) {
1793 if (GetLastError() == ERROR_ACCESS_DENIED) {
1794 DWORD attr;
1795 /* Simulate an errno of POSIX system. */
1796 attr = GetFileAttributesW(fullname);
1797 if (attr == (DWORD)-1)
1798 la_dosmaperr(GetLastError());
1799 else if (attr & FILE_ATTRIBUTE_DIRECTORY)
1800 errno = EISDIR;
1801 else
1802 errno = EACCES;
1803 } else
1804 la_dosmaperr(GetLastError());
1805 r = 1;
1806 } else
1807 r = 0;
1808 if (fullname != a->name)
1809 free(fullname);
1810 break;
1811 case AE_IFCHR:
1812 case AE_IFBLK:
1813 /* TODO: Find a better way to warn about our inability
1814 * to restore a block device node. */
1815 return (EINVAL);
1816 case AE_IFDIR:
1817 mode = (mode | MINIMUM_DIR_MODE) & MAXIMUM_DIR_MODE;
1818 fullname = a->name;
1819 r = CreateDirectoryW(fullname, NULL);
1820 if (r == 0 && GetLastError() == ERROR_INVALID_NAME &&
1821 fullname == a->name) {
1822 fullname = __la_win_permissive_name_w(a->name);
1823 r = CreateDirectoryW(fullname, NULL);
1824 }
1825 if (r != 0) {
1826 r = 0;
1827 /* Defer setting dir times. */
1828 a->deferred |= (a->todo & TODO_TIMES);
1829 a->todo &= ~TODO_TIMES;
1830 /* Never use an immediate chmod(). */
1831 /* We can't avoid the chmod() entirely if EXTRACT_PERM
1832 * because of SysV SGID inheritance. */
1833 if ((mode != final_mode)
1834 || (a->flags & ARCHIVE_EXTRACT_PERM))
1835 a->deferred |= (a->todo & TODO_MODE);
1836 a->todo &= ~TODO_MODE;
1837 } else {
1838 la_dosmaperr(GetLastError());
1839 r = -1;
1840 }
1841 if (fullname != a->name)
1842 free(fullname);
1843 break;
1844 case AE_IFIFO:
1845 /* TODO: Find a better way to warn about our inability
1846 * to restore a fifo. */
1847 return (EINVAL);
1848 }
1849
1850 /* All the system calls above set errno on failure. */
1851 if (r)
1852 return (errno);
1853
1854 /* If we managed to set the final mode, we've avoided a chmod(). */
1855 if (mode == final_mode)
1856 a->todo &= ~TODO_MODE;
1857 return (0);
1858 }
1859
1860 /*
1861 * Cleanup function for archive_extract. Mostly, this involves processing
1862 * the fixup list, which is used to address a number of problems:
1863 * * Dir permissions might prevent us from restoring a file in that
1864 * dir, so we restore the dir with minimum 0700 permissions first,
1865 * then correct the mode at the end.
1866 * * Similarly, the act of restoring a file touches the directory
1867 * and changes the timestamp on the dir, so we have to touch-up dir
1868 * timestamps at the end as well.
1869 * * Some file flags can interfere with the restore by, for example,
1870 * preventing the creation of hardlinks to those files.
1871 * * Mac OS extended metadata includes ACLs, so must be deferred on dirs.
1872 *
1873 * Note that tar/cpio do not require that archives be in a particular
1874 * order; there is no way to know when the last file has been restored
1875 * within a directory, so there's no way to optimize the memory usage
1876 * here by fixing up the directory any earlier than the
1877 * end-of-archive.
1878 *
1879 * XXX TODO: Directory ACLs should be restored here, for the same
1880 * reason we set directory perms here. XXX
1881 */
1882 static int
_archive_write_disk_close(struct archive * _a)1883 _archive_write_disk_close(struct archive *_a)
1884 {
1885 struct archive_write_disk *a = (struct archive_write_disk *)_a;
1886 struct fixup_entry *next, *p;
1887 int ret;
1888
1889 archive_check_magic(&a->archive, ARCHIVE_WRITE_DISK_MAGIC,
1890 ARCHIVE_STATE_HEADER | ARCHIVE_STATE_DATA,
1891 "archive_write_disk_close");
1892 ret = _archive_write_disk_finish_entry(&a->archive);
1893
1894 /* Sort dir list so directories are fixed up in depth-first order. */
1895 p = sort_dir_list(a->fixup_list);
1896
1897 while (p != NULL) {
1898 a->pst = NULL; /* Mark stat cache as out-of-date. */
1899 if (p->fixup & TODO_TIMES) {
1900 set_times(a, INVALID_HANDLE_VALUE, p->mode, p->name,
1901 p->atime, p->atime_nanos,
1902 p->birthtime, p->birthtime_nanos,
1903 p->mtime, p->mtime_nanos,
1904 p->ctime, p->ctime_nanos);
1905 }
1906 if (p->fixup & TODO_MODE_BASE)
1907 la_chmod(p->name, p->mode);
1908 if (p->fixup & TODO_ACLS)
1909 set_acls(a, INVALID_HANDLE_VALUE, p->name, &p->acl);
1910 if (p->fixup & TODO_FFLAGS)
1911 set_fflags_platform(p->name, p->fflags_set, 0);
1912 next = p->next;
1913 archive_acl_clear(&p->acl);
1914 free(p->name);
1915 free(p);
1916 p = next;
1917 }
1918 a->fixup_list = NULL;
1919 return (ret);
1920 }
1921
1922 static int
_archive_write_disk_free(struct archive * _a)1923 _archive_write_disk_free(struct archive *_a)
1924 {
1925 struct archive_write_disk *a;
1926 int ret;
1927 if (_a == NULL)
1928 return (ARCHIVE_OK);
1929 archive_check_magic(_a, ARCHIVE_WRITE_DISK_MAGIC,
1930 ARCHIVE_STATE_ANY | ARCHIVE_STATE_FATAL, "archive_write_disk_free");
1931 a = (struct archive_write_disk *)_a;
1932 ret = _archive_write_disk_close(&a->archive);
1933 archive_write_disk_set_group_lookup(&a->archive, NULL, NULL, NULL);
1934 archive_write_disk_set_user_lookup(&a->archive, NULL, NULL, NULL);
1935 archive_entry_free(a->entry);
1936 archive_wstring_free(&a->_name_data);
1937 archive_wstring_free(&a->_tmpname_data);
1938 archive_string_free(&a->archive.error_string);
1939 archive_wstring_free(&a->path_safe);
1940 a->archive.magic = 0;
1941 __archive_clean(&a->archive);
1942 free(a);
1943 return (ret);
1944 }
1945
1946 /*
1947 * Simple O(n log n) merge sort to order the fixup list. In
1948 * particular, we want to restore dir timestamps depth-first.
1949 */
1950 static struct fixup_entry *
sort_dir_list(struct fixup_entry * p)1951 sort_dir_list(struct fixup_entry *p)
1952 {
1953 struct fixup_entry *a, *b, *t;
1954
1955 if (p == NULL)
1956 return (NULL);
1957 /* A one-item list is already sorted. */
1958 if (p->next == NULL)
1959 return (p);
1960
1961 /* Step 1: split the list. */
1962 t = p;
1963 a = p->next->next;
1964 while (a != NULL) {
1965 /* Step a twice, t once. */
1966 a = a->next;
1967 if (a != NULL)
1968 a = a->next;
1969 t = t->next;
1970 }
1971 /* Now, t is at the mid-point, so break the list here. */
1972 b = t->next;
1973 t->next = NULL;
1974 a = p;
1975
1976 /* Step 2: Recursively sort the two sub-lists. */
1977 a = sort_dir_list(a);
1978 b = sort_dir_list(b);
1979
1980 /* Step 3: Merge the returned lists. */
1981 /* Pick the first element for the merged list. */
1982 if (wcscmp(a->name, b->name) > 0) {
1983 t = p = a;
1984 a = a->next;
1985 } else {
1986 t = p = b;
1987 b = b->next;
1988 }
1989
1990 /* Always put the later element on the list first. */
1991 while (a != NULL && b != NULL) {
1992 if (wcscmp(a->name, b->name) > 0) {
1993 t->next = a;
1994 a = a->next;
1995 } else {
1996 t->next = b;
1997 b = b->next;
1998 }
1999 t = t->next;
2000 }
2001
2002 /* Only one list is non-empty, so just splice it on. */
2003 if (a != NULL)
2004 t->next = a;
2005 if (b != NULL)
2006 t->next = b;
2007
2008 return (p);
2009 }
2010
2011 /*
2012 * Returns a new, initialized fixup entry.
2013 *
2014 * TODO: Reduce the memory requirements for this list by using a tree
2015 * structure rather than a simple list of names.
2016 */
2017 static struct fixup_entry *
new_fixup(struct archive_write_disk * a,const wchar_t * pathname)2018 new_fixup(struct archive_write_disk *a, const wchar_t *pathname)
2019 {
2020 struct fixup_entry *fe;
2021
2022 fe = (struct fixup_entry *)calloc(1, sizeof(struct fixup_entry));
2023 if (fe == NULL)
2024 return (NULL);
2025 fe->next = a->fixup_list;
2026 a->fixup_list = fe;
2027 fe->fixup = 0;
2028 fe->name = _wcsdup(pathname);
2029 fe->fflags_set = 0;
2030 return (fe);
2031 }
2032
2033 /*
2034 * Returns a fixup structure for the current entry.
2035 */
2036 static struct fixup_entry *
current_fixup(struct archive_write_disk * a,const wchar_t * pathname)2037 current_fixup(struct archive_write_disk *a, const wchar_t *pathname)
2038 {
2039 if (a->current_fixup == NULL)
2040 a->current_fixup = new_fixup(a, pathname);
2041 return (a->current_fixup);
2042 }
2043
2044 /*
2045 * TODO: The deep-directory support bypasses this; disable deep directory
2046 * support if we're doing symlink checks.
2047 */
2048 /*
2049 * TODO: Someday, integrate this with the deep dir support; they both
2050 * scan the path and both can be optimized by comparing against other
2051 * recent paths.
2052 */
2053 static int
check_symlinks(struct archive_write_disk * a)2054 check_symlinks(struct archive_write_disk *a)
2055 {
2056 wchar_t *pn, *p;
2057 wchar_t c;
2058 int r;
2059 BY_HANDLE_FILE_INFORMATION st;
2060 mode_t st_mode;
2061
2062 /*
2063 * Guard against symlink tricks. Reject any archive entry whose
2064 * destination would be altered by a symlink.
2065 */
2066 /* Whatever we checked last time doesn't need to be re-checked. */
2067 pn = a->name;
2068 p = a->path_safe.s;
2069 while ((*pn != '\0') && (*p == *pn))
2070 ++p, ++pn;
2071 /* Skip leading backslashes */
2072 while (*pn == '\\')
2073 ++pn;
2074 c = pn[0];
2075 /* Keep going until we've checked the entire name. */
2076 while (pn[0] != '\0' && (pn[0] != '\\' || pn[1] != '\0')) {
2077 /* Skip the next path element. */
2078 while (*pn != '\0' && *pn != '\\')
2079 ++pn;
2080 c = pn[0];
2081 pn[0] = '\0';
2082 /* Check that we haven't hit a symlink. */
2083 r = file_information(a, a->name, &st, &st_mode, 1);
2084 if (r != 0) {
2085 /* We've hit a dir that doesn't exist; stop now. */
2086 if (errno == ENOENT)
2087 break;
2088 } else if (S_ISLNK(st_mode)) {
2089 if (c == '\0') {
2090 /*
2091 * Last element is a file or directory symlink.
2092 * Remove it so we can overwrite it with the
2093 * item being extracted.
2094 */
2095 if (a->flags &
2096 ARCHIVE_EXTRACT_CLEAR_NOCHANGE_FFLAGS) {
2097 (void)clear_nochange_fflags(a);
2098 }
2099 if (st.dwFileAttributes &
2100 FILE_ATTRIBUTE_DIRECTORY) {
2101 r = disk_rmdir(a->name);
2102 } else {
2103 r = disk_unlink(a->name);
2104 }
2105 if (r) {
2106 archive_set_error(&a->archive, errno,
2107 "Could not remove symlink %ls",
2108 a->name);
2109 pn[0] = c;
2110 return (ARCHIVE_FAILED);
2111 }
2112 a->pst = NULL;
2113 /*
2114 * Even if we did remove it, a warning
2115 * is in order. The warning is silly,
2116 * though, if we're just replacing one
2117 * symlink with another symlink.
2118 */
2119 if (!S_ISLNK(a->mode)) {
2120 archive_set_error(&a->archive, 0,
2121 "Removing symlink %ls",
2122 a->name);
2123 }
2124 /* Symlink gone. No more problem! */
2125 pn[0] = c;
2126 return (0);
2127 } else if (a->flags & ARCHIVE_EXTRACT_UNLINK) {
2128 /* User asked us to remove problems. */
2129 if (a->flags &
2130 ARCHIVE_EXTRACT_CLEAR_NOCHANGE_FFLAGS) {
2131 (void)clear_nochange_fflags(a);
2132 }
2133 if (st.dwFileAttributes &
2134 FILE_ATTRIBUTE_DIRECTORY) {
2135 r = disk_rmdir(a->name);
2136 } else {
2137 r = disk_unlink(a->name);
2138 }
2139 if (r != 0) {
2140 archive_set_error(&a->archive, 0,
2141 "Cannot remove intervening "
2142 "symlink %ls", a->name);
2143 pn[0] = c;
2144 return (ARCHIVE_FAILED);
2145 }
2146 a->pst = NULL;
2147 } else {
2148 archive_set_error(&a->archive, 0,
2149 "Cannot extract through symlink %ls",
2150 a->name);
2151 pn[0] = c;
2152 return (ARCHIVE_FAILED);
2153 }
2154 }
2155 pn[0] = c;
2156 pn++;
2157 }
2158 pn[0] = c;
2159 /* We've checked and/or cleaned the whole path, so remember it. */
2160 archive_wstrcpy(&a->path_safe, a->name);
2161 return (ARCHIVE_OK);
2162 }
2163
2164 static int
guidword(wchar_t * p,int n)2165 guidword(wchar_t *p, int n)
2166 {
2167 int i;
2168
2169 for (i = 0; i < n; i++) {
2170 if ((*p >= L'0' && *p <= L'9') ||
2171 (*p >= L'a' && *p <= L'f') ||
2172 (*p >= L'A' && *p <= L'F'))
2173 p++;
2174 else
2175 return (-1);
2176 }
2177 return (0);
2178 }
2179
2180 /*
2181 * Canonicalize the pathname. In particular, this strips duplicate
2182 * '\' characters, '.' elements, and trailing '\'. It also raises an
2183 * error for an empty path, a trailing '..' or (if _SECURE_NODOTDOT is
2184 * set) any '..' in the path.
2185 */
2186 static int
cleanup_pathname(struct archive_write_disk * a)2187 cleanup_pathname(struct archive_write_disk *a)
2188 {
2189 wchar_t *dest, *src, *p, *top;
2190 wchar_t separator = L'\0';
2191
2192 p = a->name;
2193 if (*p == L'\0') {
2194 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
2195 "Invalid empty pathname");
2196 return (ARCHIVE_FAILED);
2197 }
2198
2199 /* Replace '/' by '\' */
2200 for (; *p != L'\0'; p++) {
2201 if (*p == L'/')
2202 *p = L'\\';
2203 }
2204 p = a->name;
2205
2206 /* Skip leading "\\.\" or "\\?\" or "\\?\UNC\" or
2207 * "\\?\Volume{GUID}\"
2208 * (absolute path prefixes used by Windows API) */
2209 if (p[0] == L'\\' && p[1] == L'\\' &&
2210 (p[2] == L'.' || p[2] == L'?') && p[3] == L'\\')
2211 {
2212 /* A path begin with "\\?\UNC\" */
2213 if (p[2] == L'?' &&
2214 (p[4] == L'U' || p[4] == L'u') &&
2215 (p[5] == L'N' || p[5] == L'n') &&
2216 (p[6] == L'C' || p[6] == L'c') &&
2217 p[7] == L'\\')
2218 p += 8;
2219 /* A path begin with "\\?\Volume{GUID}\" */
2220 else if (p[2] == L'?' &&
2221 (p[4] == L'V' || p[4] == L'v') &&
2222 (p[5] == L'O' || p[5] == L'o') &&
2223 (p[6] == L'L' || p[6] == L'l') &&
2224 (p[7] == L'U' || p[7] == L'u') &&
2225 (p[8] == L'M' || p[8] == L'm') &&
2226 (p[9] == L'E' || p[9] == L'e') &&
2227 p[10] == L'{') {
2228 if (guidword(p+11, 8) == 0 && p[19] == L'-' &&
2229 guidword(p+20, 4) == 0 && p[24] == L'-' &&
2230 guidword(p+25, 4) == 0 && p[29] == L'-' &&
2231 guidword(p+30, 4) == 0 && p[34] == L'-' &&
2232 guidword(p+35, 12) == 0 && p[47] == L'}' &&
2233 p[48] == L'\\')
2234 p += 49;
2235 else
2236 p += 4;
2237 /* A path begin with "\\.\PhysicalDriveX" */
2238 } else if (p[2] == L'.' &&
2239 (p[4] == L'P' || p[4] == L'p') &&
2240 (p[5] == L'H' || p[5] == L'h') &&
2241 (p[6] == L'Y' || p[6] == L'y') &&
2242 (p[7] == L'S' || p[7] == L's') &&
2243 (p[8] == L'I' || p[8] == L'i') &&
2244 (p[9] == L'C' || p[9] == L'c') &&
2245 (p[9] == L'A' || p[9] == L'a') &&
2246 (p[9] == L'L' || p[9] == L'l') &&
2247 (p[9] == L'D' || p[9] == L'd') &&
2248 (p[9] == L'R' || p[9] == L'r') &&
2249 (p[9] == L'I' || p[9] == L'i') &&
2250 (p[9] == L'V' || p[9] == L'v') &&
2251 (p[9] == L'E' || p[9] == L'e') &&
2252 (p[10] >= L'0' && p[10] <= L'9') &&
2253 p[11] == L'\0') {
2254 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
2255 "Path is a physical drive name");
2256 return (ARCHIVE_FAILED);
2257 } else
2258 p += 4;
2259 }
2260
2261 /* Skip leading drive letter from archives created
2262 * on Windows. */
2263 if (((p[0] >= L'a' && p[0] <= L'z') ||
2264 (p[0] >= L'A' && p[0] <= L'Z')) &&
2265 p[1] == L':') {
2266 if (p[2] == L'\0') {
2267 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
2268 "Path is a drive name");
2269 return (ARCHIVE_FAILED);
2270 }
2271 if (p[2] == L'\\')
2272 p += 2;
2273 }
2274
2275 top = dest = src = p;
2276 /* Rewrite the path name if its character is a unusable. */
2277 for (; *p != L'\0'; p++) {
2278 if (*p == L':' || *p == L'*' || *p == L'?' || *p == L'"' ||
2279 *p == L'<' || *p == L'>' || *p == L'|')
2280 *p = L'_';
2281 }
2282 /* Skip leading '\'. */
2283 if (*src == L'\\')
2284 separator = *src++;
2285
2286 /* Scan the pathname one element at a time. */
2287 for (;;) {
2288 /* src points to first char after '\' */
2289 if (src[0] == L'\0') {
2290 break;
2291 } else if (src[0] == L'\\') {
2292 /* Found '\\'('//'), ignore second one. */
2293 src++;
2294 continue;
2295 } else if (src[0] == L'.') {
2296 if (src[1] == L'\0') {
2297 /* Ignore trailing '.' */
2298 break;
2299 } else if (src[1] == L'\\') {
2300 /* Skip '.\'. */
2301 src += 2;
2302 continue;
2303 } else if (src[1] == L'.') {
2304 if (src[2] == L'\\' || src[2] == L'\0') {
2305 /* Conditionally warn about '..' */
2306 if (a->flags &
2307 ARCHIVE_EXTRACT_SECURE_NODOTDOT) {
2308 archive_set_error(&a->archive,
2309 ARCHIVE_ERRNO_MISC,
2310 "Path contains '..'");
2311 return (ARCHIVE_FAILED);
2312 }
2313 }
2314 /*
2315 * Note: Under no circumstances do we
2316 * remove '..' elements. In
2317 * particular, restoring
2318 * '\foo\..\bar\' should create the
2319 * 'foo' dir as a side-effect.
2320 */
2321 }
2322 }
2323
2324 /* Copy current element, including leading '\'. */
2325 if (separator)
2326 *dest++ = L'\\';
2327 while (*src != L'\0' && *src != L'\\') {
2328 *dest++ = *src++;
2329 }
2330
2331 if (*src == L'\0')
2332 break;
2333
2334 /* Skip '\' separator. */
2335 separator = *src++;
2336 }
2337 /*
2338 * We've just copied zero or more path elements, not including the
2339 * final '\'.
2340 */
2341 if (dest == top) {
2342 /*
2343 * Nothing got copied. The path must have been something
2344 * like '.' or '\' or './' or '/././././/./'.
2345 */
2346 if (separator)
2347 *dest++ = L'\\';
2348 else
2349 *dest++ = L'.';
2350 }
2351 /* Terminate the result. */
2352 *dest = L'\0';
2353 return (ARCHIVE_OK);
2354 }
2355
2356 /*
2357 * Create the parent directory of the specified path, assuming path
2358 * is already in mutable storage.
2359 */
2360 static int
create_parent_dir(struct archive_write_disk * a,wchar_t * path)2361 create_parent_dir(struct archive_write_disk *a, wchar_t *path)
2362 {
2363 wchar_t *slash;
2364 int r;
2365
2366 /* Remove tail element to obtain parent name. */
2367 slash = wcsrchr(path, L'\\');
2368 if (slash == NULL)
2369 return (ARCHIVE_OK);
2370 *slash = L'\0';
2371 r = create_dir(a, path);
2372 *slash = L'\\';
2373 return (r);
2374 }
2375
2376 /*
2377 * Create the specified dir, recursing to create parents as necessary.
2378 *
2379 * Returns ARCHIVE_OK if the path exists when we're done here.
2380 * Otherwise, returns ARCHIVE_FAILED.
2381 * Assumes path is in mutable storage; path is unchanged on exit.
2382 */
2383 static int
create_dir(struct archive_write_disk * a,wchar_t * path)2384 create_dir(struct archive_write_disk *a, wchar_t *path)
2385 {
2386 BY_HANDLE_FILE_INFORMATION st;
2387 struct fixup_entry *le;
2388 wchar_t *slash, *base, *full;
2389 mode_t mode_final, mode, st_mode;
2390 int r;
2391
2392 /* Check for special names and just skip them. */
2393 slash = wcsrchr(path, L'\\');
2394 if (slash == NULL)
2395 base = path;
2396 else
2397 base = slash + 1;
2398
2399 if (base[0] == L'\0' ||
2400 (base[0] == L'.' && base[1] == L'\0') ||
2401 (base[0] == L'.' && base[1] == L'.' && base[2] == L'\0')) {
2402 /* Don't bother trying to create null path, '.', or '..'. */
2403 if (slash != NULL) {
2404 *slash = L'\0';
2405 r = create_dir(a, path);
2406 *slash = L'\\';
2407 return (r);
2408 }
2409 return (ARCHIVE_OK);
2410 }
2411
2412 /*
2413 * Yes, this should be stat() and not lstat(). Using lstat()
2414 * here loses the ability to extract through symlinks. Also note
2415 * that this should not use the a->st cache.
2416 */
2417 if (file_information(a, path, &st, &st_mode, 0) == 0) {
2418 if (S_ISDIR(st_mode))
2419 return (ARCHIVE_OK);
2420 if ((a->flags & ARCHIVE_EXTRACT_NO_OVERWRITE)) {
2421 archive_set_error(&a->archive, EEXIST,
2422 "Can't create directory '%ls'", path);
2423 return (ARCHIVE_FAILED);
2424 }
2425 if (disk_unlink(path) != 0) {
2426 archive_set_error(&a->archive, errno,
2427 "Can't create directory '%ls': "
2428 "Conflicting file cannot be removed",
2429 path);
2430 return (ARCHIVE_FAILED);
2431 }
2432 } else if (errno != ENOENT && errno != ENOTDIR) {
2433 /* Stat failed? */
2434 archive_set_error(&a->archive, errno,
2435 "Can't test directory '%ls'", path);
2436 return (ARCHIVE_FAILED);
2437 } else if (slash != NULL) {
2438 *slash = '\0';
2439 r = create_dir(a, path);
2440 *slash = '\\';
2441 if (r != ARCHIVE_OK)
2442 return (r);
2443 }
2444
2445 /*
2446 * Mode we want for the final restored directory. Per POSIX,
2447 * implicitly-created dirs must be created obeying the umask.
2448 * There's no mention whether this is different for privileged
2449 * restores (which the rest of this code handles by pretending
2450 * umask=0). I've chosen here to always obey the user's umask for
2451 * implicit dirs, even if _EXTRACT_PERM was specified.
2452 */
2453 mode_final = DEFAULT_DIR_MODE & ~a->user_umask;
2454 /* Mode we want on disk during the restore process. */
2455 mode = mode_final;
2456 mode |= MINIMUM_DIR_MODE;
2457 mode &= MAXIMUM_DIR_MODE;
2458 /*
2459 * Apply __la_win_permissive_name_w to path in order to
2460 * remove '../' path string.
2461 */
2462 full = __la_win_permissive_name_w(path);
2463 if (full == NULL)
2464 errno = EINVAL;
2465 else if (CreateDirectoryW(full, NULL) != 0) {
2466 if (mode != mode_final) {
2467 le = new_fixup(a, path);
2468 le->fixup |=TODO_MODE_BASE;
2469 le->mode = mode_final;
2470 }
2471 free(full);
2472 return (ARCHIVE_OK);
2473 } else {
2474 la_dosmaperr(GetLastError());
2475 }
2476 free(full);
2477
2478 /*
2479 * Without the following check, a/b/../b/c/d fails at the
2480 * second visit to 'b', so 'd' can't be created. Note that we
2481 * don't add it to the fixup list here, as it's already been
2482 * added.
2483 */
2484 if (file_information(a, path, &st, &st_mode, 0) == 0 &&
2485 S_ISDIR(st_mode))
2486 return (ARCHIVE_OK);
2487
2488 archive_set_error(&a->archive, errno, "Failed to create dir '%ls'",
2489 path);
2490 return (ARCHIVE_FAILED);
2491 }
2492
2493 /*
2494 * Note: Although we can skip setting the user id if the desired user
2495 * id matches the current user, we cannot skip setting the group, as
2496 * many systems set the gid based on the containing directory. So
2497 * we have to perform a chown syscall if we want to set the SGID
2498 * bit. (The alternative is to stat() and then possibly chown(); it's
2499 * more efficient to skip the stat() and just always chown().) Note
2500 * that a successful chown() here clears the TODO_SGID_CHECK bit, which
2501 * allows set_mode to skip the stat() check for the GID.
2502 */
2503 static int
set_ownership(struct archive_write_disk * a)2504 set_ownership(struct archive_write_disk *a)
2505 {
2506 /* unfortunately, on win32 there is no 'root' user with uid 0,
2507 so we just have to try the chown and see if it works */
2508
2509 /* If we know we can't change it, don't bother trying. */
2510 if (a->user_uid != 0 && a->user_uid != a->uid) {
2511 archive_set_error(&a->archive, errno,
2512 "Can't set UID=%jd", (intmax_t)a->uid);
2513 return (ARCHIVE_WARN);
2514 }
2515
2516 archive_set_error(&a->archive, errno,
2517 "Can't set user=%jd/group=%jd for %ls",
2518 (intmax_t)a->uid, (intmax_t)a->gid, a->name);
2519 return (ARCHIVE_WARN);
2520 }
2521
2522 static int
set_times(struct archive_write_disk * a,HANDLE h,int mode,const wchar_t * name,time_t atime,long atime_nanos,time_t birthtime,long birthtime_nanos,time_t mtime,long mtime_nanos,time_t ctime_sec,long ctime_nanos)2523 set_times(struct archive_write_disk *a,
2524 HANDLE h, int mode, const wchar_t *name,
2525 time_t atime, long atime_nanos,
2526 time_t birthtime, long birthtime_nanos,
2527 time_t mtime, long mtime_nanos,
2528 time_t ctime_sec, long ctime_nanos)
2529 {
2530 #define EPOC_TIME ARCHIVE_LITERAL_ULL(116444736000000000)
2531 #define WINTIME(sec, nsec) ((Int32x32To64(sec, 10000000) + EPOC_TIME)\
2532 + (((nsec)/1000)*10))
2533
2534 HANDLE hw = 0;
2535 ULARGE_INTEGER wintm;
2536 FILETIME *pfbtime;
2537 FILETIME fatime, fbtime, fmtime;
2538
2539 (void)ctime_sec; /* UNUSED */
2540 (void)ctime_nanos; /* UNUSED */
2541
2542 if (h != INVALID_HANDLE_VALUE) {
2543 hw = NULL;
2544 } else {
2545 wchar_t *ws;
2546
2547 if (S_ISLNK(mode))
2548 return (ARCHIVE_OK);
2549 ws = __la_win_permissive_name_w(name);
2550 if (ws == NULL)
2551 goto settimes_failed;
2552 hw = CreateFileW(ws, FILE_WRITE_ATTRIBUTES,
2553 0, NULL, OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, NULL);
2554 free(ws);
2555 if (hw == INVALID_HANDLE_VALUE)
2556 goto settimes_failed;
2557 h = hw;
2558 }
2559
2560 wintm.QuadPart = WINTIME(atime, atime_nanos);
2561 fatime.dwLowDateTime = wintm.LowPart;
2562 fatime.dwHighDateTime = wintm.HighPart;
2563 wintm.QuadPart = WINTIME(mtime, mtime_nanos);
2564 fmtime.dwLowDateTime = wintm.LowPart;
2565 fmtime.dwHighDateTime = wintm.HighPart;
2566 /*
2567 * SetFileTime() supports birthtime.
2568 */
2569 if (birthtime > 0 || birthtime_nanos > 0) {
2570 wintm.QuadPart = WINTIME(birthtime, birthtime_nanos);
2571 fbtime.dwLowDateTime = wintm.LowPart;
2572 fbtime.dwHighDateTime = wintm.HighPart;
2573 pfbtime = &fbtime;
2574 } else
2575 pfbtime = NULL;
2576 if (SetFileTime(h, pfbtime, &fatime, &fmtime) == 0)
2577 goto settimes_failed;
2578 CloseHandle(hw);
2579 return (ARCHIVE_OK);
2580
2581 settimes_failed:
2582 CloseHandle(hw);
2583 archive_set_error(&a->archive, EINVAL, "Can't restore time");
2584 return (ARCHIVE_WARN);
2585 }
2586
2587 static int
set_times_from_entry(struct archive_write_disk * a)2588 set_times_from_entry(struct archive_write_disk *a)
2589 {
2590 time_t atime, birthtime, mtime, ctime_sec;
2591 long atime_nsec, birthtime_nsec, mtime_nsec, ctime_nsec;
2592
2593 /* Suitable defaults. */
2594 atime = birthtime = mtime = ctime_sec = a->start_time;
2595 atime_nsec = birthtime_nsec = mtime_nsec = ctime_nsec = 0;
2596
2597 /* If no time was provided, we're done. */
2598 if (!archive_entry_atime_is_set(a->entry)
2599 && !archive_entry_birthtime_is_set(a->entry)
2600 && !archive_entry_mtime_is_set(a->entry))
2601 return (ARCHIVE_OK);
2602
2603 if (archive_entry_atime_is_set(a->entry)) {
2604 atime = archive_entry_atime(a->entry);
2605 atime_nsec = archive_entry_atime_nsec(a->entry);
2606 }
2607 if (archive_entry_birthtime_is_set(a->entry)) {
2608 birthtime = archive_entry_birthtime(a->entry);
2609 birthtime_nsec = archive_entry_birthtime_nsec(a->entry);
2610 }
2611 if (archive_entry_mtime_is_set(a->entry)) {
2612 mtime = archive_entry_mtime(a->entry);
2613 mtime_nsec = archive_entry_mtime_nsec(a->entry);
2614 }
2615 if (archive_entry_ctime_is_set(a->entry)) {
2616 ctime_sec = archive_entry_ctime(a->entry);
2617 ctime_nsec = archive_entry_ctime_nsec(a->entry);
2618 }
2619
2620 return set_times(a, a->fh, a->mode, a->name,
2621 atime, atime_nsec,
2622 birthtime, birthtime_nsec,
2623 mtime, mtime_nsec,
2624 ctime_sec, ctime_nsec);
2625 }
2626
2627 static int
set_mode(struct archive_write_disk * a,int mode)2628 set_mode(struct archive_write_disk *a, int mode)
2629 {
2630 int r = ARCHIVE_OK;
2631 mode &= 07777; /* Strip off file type bits. */
2632
2633 if (a->todo & TODO_SGID_CHECK) {
2634 /*
2635 * If we don't know the GID is right, we must stat()
2636 * to verify it. We can't just check the GID of this
2637 * process, since systems sometimes set GID from
2638 * the enclosing dir or based on ACLs.
2639 */
2640 if ((r = lazy_stat(a)) != ARCHIVE_OK)
2641 return (r);
2642 if (0 != a->gid) {
2643 mode &= ~ S_ISGID;
2644 }
2645 /* While we're here, double-check the UID. */
2646 if (0 != a->uid
2647 && (a->todo & TODO_SUID)) {
2648 mode &= ~ S_ISUID;
2649 }
2650 a->todo &= ~TODO_SGID_CHECK;
2651 a->todo &= ~TODO_SUID_CHECK;
2652 } else if (a->todo & TODO_SUID_CHECK) {
2653 /*
2654 * If we don't know the UID is right, we can just check
2655 * the user, since all systems set the file UID from
2656 * the process UID.
2657 */
2658 if (a->user_uid != a->uid) {
2659 mode &= ~ S_ISUID;
2660 }
2661 a->todo &= ~TODO_SUID_CHECK;
2662 }
2663
2664 if (S_ISLNK(a->mode)) {
2665 #ifdef HAVE_LCHMOD
2666 /*
2667 * If this is a symlink, use lchmod(). If the
2668 * platform doesn't support lchmod(), just skip it. A
2669 * platform that doesn't provide a way to set
2670 * permissions on symlinks probably ignores
2671 * permissions on symlinks, so a failure here has no
2672 * impact.
2673 */
2674 if (lchmod(a->name, mode) != 0) {
2675 archive_set_error(&a->archive, errno,
2676 "Can't set permissions to 0%o", (int)mode);
2677 r = ARCHIVE_WARN;
2678 }
2679 #endif
2680 } else if (!S_ISDIR(a->mode)) {
2681 /*
2682 * If it's not a symlink and not a dir, then use
2683 * fchmod() or chmod(), depending on whether we have
2684 * an fd. Dirs get their perms set during the
2685 * post-extract fixup, which is handled elsewhere.
2686 */
2687 #ifdef HAVE_FCHMOD
2688 if (a->fd >= 0) {
2689 if (fchmod(a->fd, mode) != 0) {
2690 archive_set_error(&a->archive, errno,
2691 "Can't set permissions to 0%o", (int)mode);
2692 r = ARCHIVE_WARN;
2693 }
2694 } else
2695 #endif
2696 /* If this platform lacks fchmod(), then
2697 * we'll just use chmod(). */
2698 if (la_chmod(a->name, mode) != 0) {
2699 archive_set_error(&a->archive, errno,
2700 "Can't set permissions to 0%o", (int)mode);
2701 r = ARCHIVE_WARN;
2702 }
2703 }
2704 return (r);
2705 }
2706
set_fflags_platform(const wchar_t * name,unsigned long fflags_set,unsigned long fflags_clear)2707 static int set_fflags_platform(const wchar_t *name, unsigned long fflags_set,
2708 unsigned long fflags_clear)
2709 {
2710 DWORD oldflags, newflags;
2711 wchar_t *fullname;
2712
2713 const DWORD settable_flags =
2714 FILE_ATTRIBUTE_ARCHIVE |
2715 FILE_ATTRIBUTE_HIDDEN |
2716 FILE_ATTRIBUTE_NORMAL |
2717 FILE_ATTRIBUTE_NOT_CONTENT_INDEXED |
2718 FILE_ATTRIBUTE_OFFLINE |
2719 FILE_ATTRIBUTE_READONLY |
2720 FILE_ATTRIBUTE_SYSTEM |
2721 FILE_ATTRIBUTE_TEMPORARY;
2722
2723 oldflags = GetFileAttributesW(name);
2724 if (oldflags == (DWORD)-1 &&
2725 GetLastError() == ERROR_INVALID_NAME) {
2726 fullname = __la_win_permissive_name_w(name);
2727 oldflags = GetFileAttributesW(fullname);
2728 }
2729 if (oldflags == (DWORD)-1) {
2730 la_dosmaperr(GetLastError());
2731 return (ARCHIVE_WARN);
2732 }
2733 newflags = ((oldflags & ~fflags_clear) | fflags_set) & settable_flags;
2734 if(SetFileAttributesW(name, newflags) == 0)
2735 return (ARCHIVE_WARN);
2736 return (ARCHIVE_OK);
2737 }
2738
2739 static int
clear_nochange_fflags(struct archive_write_disk * a)2740 clear_nochange_fflags(struct archive_write_disk *a)
2741 {
2742 return (set_fflags_platform(a->name, 0, FILE_ATTRIBUTE_READONLY));
2743 }
2744
2745 static int
set_fflags(struct archive_write_disk * a)2746 set_fflags(struct archive_write_disk *a)
2747 {
2748 unsigned long set, clear;
2749
2750 if (a->todo & TODO_FFLAGS) {
2751 archive_entry_fflags(a->entry, &set, &clear);
2752 if (set == 0 && clear == 0)
2753 return (ARCHIVE_OK);
2754 return (set_fflags_platform(a->name, set, clear));
2755
2756 }
2757 return (ARCHIVE_OK);
2758 }
2759
2760 /* Default empty function body to satisfy mainline code. */
2761 static int
set_acls(struct archive_write_disk * a,HANDLE h,const wchar_t * name,struct archive_acl * acl)2762 set_acls(struct archive_write_disk *a, HANDLE h, const wchar_t *name,
2763 struct archive_acl *acl)
2764 {
2765 (void)a; /* UNUSED */
2766 (void)h; /* UNUSED */
2767 (void)name; /* UNUSED */
2768 (void)acl; /* UNUSED */
2769 return (ARCHIVE_OK);
2770 }
2771
2772 /*
2773 * Restore extended attributes - stub implementation for unsupported systems
2774 */
2775 static int
set_xattrs(struct archive_write_disk * a)2776 set_xattrs(struct archive_write_disk *a)
2777 {
2778 static int warning_done = 0;
2779
2780 /* If there aren't any extended attributes, then it's okay not
2781 * to extract them, otherwise, issue a single warning. */
2782 if (archive_entry_xattr_count(a->entry) != 0 && !warning_done) {
2783 warning_done = 1;
2784 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
2785 "Cannot restore extended attributes on this system");
2786 return (ARCHIVE_WARN);
2787 }
2788 /* Warning was already emitted; suppress further warnings. */
2789 return (ARCHIVE_OK);
2790 }
2791
2792 static void
fileTimeToUtc(const FILETIME * filetime,time_t * t,long * ns)2793 fileTimeToUtc(const FILETIME *filetime, time_t *t, long *ns)
2794 {
2795 ULARGE_INTEGER utc;
2796
2797 utc.HighPart = filetime->dwHighDateTime;
2798 utc.LowPart = filetime->dwLowDateTime;
2799 if (utc.QuadPart >= EPOC_TIME) {
2800 utc.QuadPart -= EPOC_TIME;
2801 /* milli seconds base */
2802 *t = (time_t)(utc.QuadPart / 10000000);
2803 /* nano seconds base */
2804 *ns = (long)(utc.QuadPart % 10000000) * 100;
2805 } else {
2806 *t = 0;
2807 *ns = 0;
2808 }
2809 }
2810 /*
2811 * Test if file on disk is older than entry.
2812 */
2813 static int
older(BY_HANDLE_FILE_INFORMATION * st,struct archive_entry * entry)2814 older(BY_HANDLE_FILE_INFORMATION *st, struct archive_entry *entry)
2815 {
2816 time_t sec;
2817 long nsec;
2818
2819 fileTimeToUtc(&st->ftLastWriteTime, &sec, &nsec);
2820 /* First, test the seconds and return if we have a definite answer. */
2821 /* Definitely older. */
2822 if (sec < archive_entry_mtime(entry))
2823 return (1);
2824 /* Definitely younger. */
2825 if (sec > archive_entry_mtime(entry))
2826 return (0);
2827 if (nsec < archive_entry_mtime_nsec(entry))
2828 return (1);
2829 /* Same age or newer, so not older. */
2830 return (0);
2831 }
2832
2833 #endif /* _WIN32 && !__CYGWIN__ */
2834
2835