1 /* vi: set sw=4 ts=4: */
2 /*
3 * Mini tar implementation for busybox
4 *
5 * Modified to use common extraction code used by ar, cpio, dpkg-deb, dpkg
6 * by Glenn McGrath
7 *
8 * Note, that as of BusyBox-0.43, tar has been completely rewritten from the
9 * ground up. It still has remnants of the old code lying about, but it is
10 * very different now (i.e., cleaner, less global variables, etc.)
11 *
12 * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
13 *
14 * Based in part in the tar implementation in sash
15 * Copyright (c) 1999 by David I. Bell
16 * Permission is granted to use, distribute, or modify this source,
17 * provided that this copyright notice remains intact.
18 * Permission to distribute sash derived code under GPL has been granted.
19 *
20 * Based in part on the tar implementation from busybox-0.28
21 * Copyright (C) 1995 Bruce Perens
22 *
23 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
24 */
25 //config:config TAR
26 //config: bool "tar (39 kb)"
27 //config: default y
28 //config: help
29 //config: tar is an archiving program. It's commonly used with gzip to
30 //config: create compressed archives. It's probably the most widely used
31 //config: UNIX archive program.
32 //config:
33 //config:config FEATURE_TAR_LONG_OPTIONS
34 //config: bool "Enable long options"
35 //config: default y
36 //config: depends on TAR && LONG_OPTS
37 //config:
38 //config:config FEATURE_TAR_CREATE
39 //config: bool "Enable -c (archive creation)"
40 //config: default y
41 //config: depends on TAR
42 //config:
43 //config:config FEATURE_TAR_AUTODETECT
44 //config: bool "Autodetect compressed tarballs"
45 //config: default y
46 //config: depends on TAR && (FEATURE_SEAMLESS_Z || FEATURE_SEAMLESS_GZ || FEATURE_SEAMLESS_BZ2 || FEATURE_SEAMLESS_LZMA || FEATURE_SEAMLESS_XZ)
47 //config: help
48 //config: With this option tar can automatically detect compressed
49 //config: tarballs. Currently it works only on files (not pipes etc).
50 //config:
51 //config:config FEATURE_TAR_FROM
52 //config: bool "Enable -X (exclude from) and -T (include from) options"
53 //config: default y
54 //config: depends on TAR
55 //config: help
56 //config: If you enable this option you'll be able to specify
57 //config: a list of files to include or exclude from an archive.
58 //config:
59 //config:config FEATURE_TAR_OLDGNU_COMPATIBILITY
60 //config: bool "Support old tar header format"
61 //config: default y
62 //config: depends on TAR || DPKG
63 //config: help
64 //config: This option is required to unpack archives created in
65 //config: the old GNU format; help to kill this old format by
66 //config: repacking your ancient archives with the new format.
67 //config:
68 //config:config FEATURE_TAR_OLDSUN_COMPATIBILITY
69 //config: bool "Enable untarring of tarballs with checksums produced by buggy Sun tar"
70 //config: default y
71 //config: depends on TAR || DPKG
72 //config: help
73 //config: This option is required to unpack archives created by some old
74 //config: version of Sun's tar (it was calculating checksum using signed
75 //config: arithmetic). It is said to be fixed in newer Sun tar, but "old"
76 //config: tarballs still exist.
77 //config:
78 //config:config FEATURE_TAR_GNU_EXTENSIONS
79 //config: bool "Support GNU tar extensions (long filenames)"
80 //config: default y
81 //config: depends on TAR || DPKG
82 //config:
83 //config:config FEATURE_TAR_TO_COMMAND
84 //config: bool "Support writing to an external program (--to-command)"
85 //config: default y
86 //config: depends on TAR && FEATURE_TAR_LONG_OPTIONS
87 //config: help
88 //config: If you enable this option you'll be able to instruct tar to send
89 //config: the contents of each extracted file to the standard input of an
90 //config: external program.
91 //config:
92 //config:config FEATURE_TAR_UNAME_GNAME
93 //config: bool "Enable use of user and group names"
94 //config: default y
95 //config: depends on TAR
96 //config: help
97 //config: Enable use of user and group names in tar. This affects contents
98 //config: listings (-t) and preserving permissions when unpacking (-p).
99 //config: +200 bytes.
100 //config:
101 //config:config FEATURE_TAR_NOPRESERVE_TIME
102 //config: bool "Enable -m (do not preserve time) GNU option"
103 //config: default y
104 //config: depends on TAR
105 //config:
106 //config:config FEATURE_TAR_SELINUX
107 //config: bool "Support extracting SELinux labels"
108 //config: default n
109 //config: depends on TAR && SELINUX
110 //config: help
111 //config: With this option busybox supports restoring SELinux labels
112 //config: when extracting files from tar archives.
113
114 //applet:IF_TAR(APPLET(tar, BB_DIR_BIN, BB_SUID_DROP))
115
116 //kbuild:lib-$(CONFIG_TAR) += tar.o
117
118 #include <fnmatch.h>
119 #include "libbb.h"
120 #include "common_bufsiz.h"
121 #include "bb_archive.h"
122 /* FIXME: Stop using this non-standard feature */
123 #ifndef FNM_LEADING_DIR
124 # define FNM_LEADING_DIR 0
125 #endif
126
127 #if 0
128 # define DBG(fmt, ...) bb_error_msg("%s: " fmt, __func__, ## __VA_ARGS__)
129 #else
130 # define DBG(...) ((void)0)
131 #endif
132 #define DBG_OPTION_PARSING 0
133
134
135 #define block_buf bb_common_bufsiz1
136 #define INIT_G() do { setup_common_bufsiz(); } while (0)
137
138
139 #if ENABLE_FEATURE_TAR_CREATE
140
141 /*
142 ** writeTarFile(), writeFileToTarball(), and writeTarHeader() are
143 ** the only functions that deal with the HardLinkInfo structure.
144 ** Even these functions use the xxxHardLinkInfo() functions.
145 */
146 typedef struct HardLinkInfo {
147 struct HardLinkInfo *next; /* Next entry in list */
148 dev_t dev; /* Device number */
149 ino_t ino; /* Inode number */
150 // short linkCount; /* (Hard) Link Count */
151 char name[1]; /* Start of filename (must be last) */
152 } HardLinkInfo;
153
154 /* Some info to be carried along when creating a new tarball */
155 typedef struct TarBallInfo {
156 int tarFd; /* Open-for-write file descriptor
157 * for the tarball */
158 int verboseFlag; /* Whether to print extra stuff or not */
159 # if ENABLE_FEATURE_TAR_FROM
160 const llist_t *excludeList; /* List of files to not include */
161 # endif
162 HardLinkInfo *hlInfoHead; /* Hard Link Tracking Information */
163 HardLinkInfo *hlInfo; /* Hard Link Info for the current file */
164 //TODO: save only st_dev + st_ino
165 struct stat tarFileStatBuf; /* Stat info for the tarball, letting
166 * us know the inode and device that the
167 * tarball lives, so we can avoid trying
168 * to include the tarball into itself */
169 } TarBallInfo;
170
171 /* A nice enum with all the possible tar file content types */
172 enum {
173 REGTYPE = '0', /* regular file */
174 REGTYPE0 = '\0', /* regular file (ancient bug compat) */
175 LNKTYPE = '1', /* hard link */
176 SYMTYPE = '2', /* symbolic link */
177 CHRTYPE = '3', /* character special */
178 BLKTYPE = '4', /* block special */
179 DIRTYPE = '5', /* directory */
180 FIFOTYPE = '6', /* FIFO special */
181 CONTTYPE = '7', /* reserved */
182 GNULONGLINK = 'K', /* GNU long (>100 chars) link name */
183 GNULONGNAME = 'L', /* GNU long (>100 chars) file name */
184 };
185
186 /* Might be faster (and bigger) if the dev/ino were stored in numeric order;) */
addHardLinkInfo(HardLinkInfo ** hlInfoHeadPtr,struct stat * statbuf,const char * fileName)187 static void addHardLinkInfo(HardLinkInfo **hlInfoHeadPtr,
188 struct stat *statbuf,
189 const char *fileName)
190 {
191 /* Note: hlInfoHeadPtr can never be NULL! */
192 HardLinkInfo *hlInfo;
193
194 hlInfo = xmalloc(sizeof(HardLinkInfo) + strlen(fileName));
195 hlInfo->next = *hlInfoHeadPtr;
196 *hlInfoHeadPtr = hlInfo;
197 hlInfo->dev = statbuf->st_dev;
198 hlInfo->ino = statbuf->st_ino;
199 // hlInfo->linkCount = statbuf->st_nlink;
200 strcpy(hlInfo->name, fileName);
201 }
202
freeHardLinkInfo(HardLinkInfo ** hlInfoHeadPtr)203 static void freeHardLinkInfo(HardLinkInfo **hlInfoHeadPtr)
204 {
205 HardLinkInfo *hlInfo;
206 HardLinkInfo *hlInfoNext;
207
208 if (hlInfoHeadPtr) {
209 hlInfo = *hlInfoHeadPtr;
210 while (hlInfo) {
211 hlInfoNext = hlInfo->next;
212 free(hlInfo);
213 hlInfo = hlInfoNext;
214 }
215 *hlInfoHeadPtr = NULL;
216 }
217 }
218
219 /* Might be faster (and bigger) if the dev/ino were stored in numeric order ;) */
findHardLinkInfo(HardLinkInfo * hlInfo,struct stat * statbuf)220 static HardLinkInfo *findHardLinkInfo(HardLinkInfo *hlInfo, struct stat *statbuf)
221 {
222 while (hlInfo) {
223 if (statbuf->st_ino == hlInfo->ino
224 && statbuf->st_dev == hlInfo->dev
225 ) {
226 DBG("found hardlink:'%s'", hlInfo->name);
227 break;
228 }
229 hlInfo = hlInfo->next;
230 }
231 return hlInfo;
232 }
233
234 /* Put an octal string into the specified buffer.
235 * The number is zero padded and possibly NUL terminated.
236 * Stores low-order bits only if whole value does not fit. */
putOctal(char * cp,int len,off_t value)237 static void putOctal(char *cp, int len, off_t value)
238 {
239 char tempBuffer[sizeof(off_t)*3 + 1];
240 char *tempString = tempBuffer;
241 int width;
242
243 width = sprintf(tempBuffer, "%0*"OFF_FMT"o", len, value);
244 tempString += (width - len);
245
246 /* If string has leading zeroes, we can drop one */
247 /* and field will have trailing '\0' */
248 /* (increases chances of compat with other tars) */
249 if (tempString[0] == '0')
250 tempString++;
251
252 /* Copy the string to the field */
253 memcpy(cp, tempString, len);
254 }
255 #define PUT_OCTAL(a, b) putOctal((a), sizeof(a), (b))
256
257 # if ENABLE_FEATURE_TAR_GNU_EXTENSIONS
writeLongname(int fd,int type,const char * name,int dir)258 static void writeLongname(int fd, int type, const char *name, int dir)
259 {
260 struct prefilled {
261 char mode[8]; /* 100-107 */
262 char uid[8]; /* 108-115 */
263 char gid[8]; /* 116-123 */
264 char size[12]; /* 124-135 */
265 char mtime[12]; /* 136-147 */
266 };
267 struct tar_header_t header;
268 int size;
269
270 memset(&header, 0, sizeof(header));
271 header.typeflag = type;
272 strcpy(header.name, "././@LongLink");
273 /* This sets mode/uid/gid/mtime to "00...00<NUL>" strings */
274 memset((char*)&header + offsetof(struct tar_header_t, mode), /* make gcc-9.x happy */
275 '0', sizeof(struct prefilled));
276 header.mode [sizeof(header.mode ) - 1] = '\0';
277 header.uid [sizeof(header.uid ) - 1] = '\0';
278 header.gid [sizeof(header.gid ) - 1] = '\0';
279 /* header.size is filled by '0' now, will be corrected below */
280 header.mtime[sizeof(header.mtime) - 1] = '\0';
281
282 dir = !!dir; /* normalize: 0/1 */
283 size = strlen(name) + 1 + dir; /* GNU tar uses strlen+1 */
284 /* + dir: account for possible '/' */
285
286 PUT_OCTAL(header.size, size);
287 chksum_and_xwrite_tar_header(fd, &header);
288
289 /* Write filename[/] and pad the block. */
290 /* dir=0: writes 'name<NUL>', pads */
291 /* dir=1: writes 'name', writes '/<NUL>', pads */
292 dir *= 2;
293 xwrite(fd, name, size - dir);
294 xwrite(fd, "/", dir);
295 size = (-size) & (TAR_BLOCK_SIZE-1);
296 memset(&header, 0, size);
297 xwrite(fd, &header, size);
298 }
299 # endif
300
301 /* Write out a tar header for the specified file/directory/whatever */
writeTarHeader(struct TarBallInfo * tbInfo,const char * header_name,const char * fileName,struct stat * statbuf)302 static int writeTarHeader(struct TarBallInfo *tbInfo,
303 const char *header_name, const char *fileName, struct stat *statbuf)
304 {
305 struct tar_header_t header;
306
307 memset(&header, 0, sizeof(header));
308
309 strncpy(header.name, header_name, sizeof(header.name));
310
311 /* POSIX says to mask mode with 07777. */
312 PUT_OCTAL(header.mode, statbuf->st_mode & 07777);
313 PUT_OCTAL(header.uid, statbuf->st_uid);
314 PUT_OCTAL(header.gid, statbuf->st_gid);
315 memset(header.size, '0', sizeof(header.size)-1); /* Regular file size is handled later */
316 /* users report that files with negative st_mtime cause trouble, so: */
317 PUT_OCTAL(header.mtime, statbuf->st_mtime >= 0 ? statbuf->st_mtime : 0);
318
319 /* Enter the user and group names */
320 safe_strncpy(header.uname, get_cached_username(statbuf->st_uid), sizeof(header.uname));
321 safe_strncpy(header.gname, get_cached_groupname(statbuf->st_gid), sizeof(header.gname));
322
323 if (tbInfo->hlInfo) {
324 /* This is a hard link */
325 header.typeflag = LNKTYPE;
326 strncpy(header.linkname, tbInfo->hlInfo->name,
327 sizeof(header.linkname));
328 # if ENABLE_FEATURE_TAR_GNU_EXTENSIONS
329 /* Write out long linkname if needed */
330 if (header.linkname[sizeof(header.linkname)-1])
331 writeLongname(tbInfo->tarFd, GNULONGLINK,
332 tbInfo->hlInfo->name, 0);
333 # endif
334 } else if (S_ISLNK(statbuf->st_mode)) {
335 char *lpath = xmalloc_readlink_or_warn(fileName);
336 if (!lpath)
337 return FALSE;
338 header.typeflag = SYMTYPE;
339 strncpy(header.linkname, lpath, sizeof(header.linkname));
340 # if ENABLE_FEATURE_TAR_GNU_EXTENSIONS
341 /* Write out long linkname if needed */
342 if (header.linkname[sizeof(header.linkname)-1])
343 writeLongname(tbInfo->tarFd, GNULONGLINK, lpath, 0);
344 # else
345 /* If it is larger than 100 bytes, bail out */
346 if (header.linkname[sizeof(header.linkname)-1]) {
347 free(lpath);
348 bb_simple_error_msg("names longer than "NAME_SIZE_STR" chars not supported");
349 return FALSE;
350 }
351 # endif
352 free(lpath);
353 } else if (S_ISDIR(statbuf->st_mode)) {
354 header.typeflag = DIRTYPE;
355 /* Append '/' only if there is a space for it */
356 if (!header.name[sizeof(header.name)-1])
357 header.name[strlen(header.name)] = '/';
358 } else if (S_ISCHR(statbuf->st_mode)) {
359 header.typeflag = CHRTYPE;
360 PUT_OCTAL(header.devmajor, major(statbuf->st_rdev));
361 PUT_OCTAL(header.devminor, minor(statbuf->st_rdev));
362 } else if (S_ISBLK(statbuf->st_mode)) {
363 header.typeflag = BLKTYPE;
364 PUT_OCTAL(header.devmajor, major(statbuf->st_rdev));
365 PUT_OCTAL(header.devminor, minor(statbuf->st_rdev));
366 } else if (S_ISFIFO(statbuf->st_mode)) {
367 header.typeflag = FIFOTYPE;
368 } else if (S_ISREG(statbuf->st_mode)) {
369 /* header.size field is 12 bytes long */
370 /* Does octal-encoded size fit? */
371 uoff_t filesize = statbuf->st_size;
372 if (sizeof(filesize) <= 4
373 || filesize <= (uoff_t)0777777777777LL
374 ) {
375 PUT_OCTAL(header.size, filesize);
376 }
377 /* Does base256-encoded size fit?
378 * It always does unless off_t is wider than 64 bits.
379 */
380 else if (ENABLE_FEATURE_TAR_GNU_EXTENSIONS
381 # if ULLONG_MAX > 0xffffffffffffffffLL /* 2^64-1 */
382 && (filesize <= 0x3fffffffffffffffffffffffLL)
383 # endif
384 ) {
385 /* GNU tar uses "base-256 encoding" for very large numbers.
386 * Encoding is binary, with highest bit always set as a marker
387 * and sign in next-highest bit:
388 * 80 00 .. 00 - zero
389 * bf ff .. ff - largest positive number
390 * ff ff .. ff - minus 1
391 * c0 00 .. 00 - smallest negative number
392 */
393 char *p8 = header.size + sizeof(header.size);
394 do {
395 *--p8 = (uint8_t)filesize;
396 filesize >>= 8;
397 } while (p8 != header.size);
398 *p8 |= 0x80;
399 } else {
400 bb_error_msg_and_die("can't store file '%s' "
401 "of size %"OFF_FMT"u, aborting",
402 fileName, statbuf->st_size);
403 }
404 header.typeflag = REGTYPE;
405 } else {
406 bb_error_msg("%s: unknown file type", fileName);
407 return FALSE;
408 }
409
410 # if ENABLE_FEATURE_TAR_GNU_EXTENSIONS
411 /* Write out long name if needed */
412 /* (we, like GNU tar, output long linkname *before* long name) */
413 if (header.name[sizeof(header.name)-1])
414 writeLongname(tbInfo->tarFd, GNULONGNAME,
415 header_name, S_ISDIR(statbuf->st_mode));
416 # endif
417
418 chksum_and_xwrite_tar_header(tbInfo->tarFd, &header);
419
420 /* Now do the verbose thing (or not) */
421 if (tbInfo->verboseFlag) {
422 FILE *vbFd = stdout;
423
424 /* If archive goes to stdout, verbose goes to stderr */
425 if (tbInfo->tarFd == STDOUT_FILENO)
426 vbFd = stderr;
427 /* GNU "tar cvvf" prints "extended" listing a-la "ls -l" */
428 /* We don't have such excesses here: for us "v" == "vv" */
429 /* '/' is probably a GNUism */
430 fprintf(vbFd, "%s%s\n", header_name,
431 S_ISDIR(statbuf->st_mode) ? "/" : "");
432 }
433
434 return TRUE;
435 }
436
437 # if ENABLE_FEATURE_TAR_FROM
exclude_file(const llist_t * excluded_files,const char * file)438 static int exclude_file(const llist_t *excluded_files, const char *file)
439 {
440 while (excluded_files) {
441 if (excluded_files->data[0] == '/') {
442 if (fnmatch(excluded_files->data, file,
443 FNM_PATHNAME | FNM_LEADING_DIR) == 0)
444 return 1;
445 } else {
446 const char *p;
447
448 for (p = file; p[0] != '\0'; p++) {
449 if ((p == file || p[-1] == '/')
450 && p[0] != '/'
451 && fnmatch(excluded_files->data, p,
452 FNM_PATHNAME | FNM_LEADING_DIR) == 0
453 ) {
454 return 1;
455 }
456 }
457 }
458 excluded_files = excluded_files->link;
459 }
460
461 return 0;
462 }
463 # else
464 # define exclude_file(excluded_files, file) 0
465 # endif
466
writeFileToTarball(struct recursive_state * state,const char * fileName,struct stat * statbuf)467 static int FAST_FUNC writeFileToTarball(struct recursive_state *state,
468 const char *fileName,
469 struct stat *statbuf)
470 {
471 struct TarBallInfo *tbInfo = (struct TarBallInfo *) state->userData;
472 const char *header_name;
473 int inputFileFd = -1;
474
475 DBG("writeFileToTarball('%s')", fileName);
476
477 /* Strip leading '/' and such (must be before memorizing hardlink's name) */
478 header_name = strip_unsafe_prefix(fileName);
479
480 if (header_name[0] == '\0')
481 return TRUE;
482
483 if (exclude_file(tbInfo->excludeList, header_name))
484 return SKIP; /* "do not recurse on this directory", no error message printed */
485
486 /* It is against the rules to archive a socket */
487 if (S_ISSOCK(statbuf->st_mode)) {
488 bb_error_msg("%s: socket ignored", fileName);
489 return TRUE;
490 }
491
492 /*
493 * Check to see if we are dealing with a hard link.
494 * If so -
495 * Treat the first occurrence of a given dev/inode as a file while
496 * treating any additional occurrences as hard links. This is done
497 * by adding the file information to the HardLinkInfo linked list.
498 */
499 tbInfo->hlInfo = NULL;
500 if (!S_ISDIR(statbuf->st_mode) && statbuf->st_nlink > 1) {
501 DBG("'%s': st_nlink > 1", header_name);
502 tbInfo->hlInfo = findHardLinkInfo(tbInfo->hlInfoHead, statbuf);
503 if (tbInfo->hlInfo == NULL) {
504 DBG("'%s': addHardLinkInfo", header_name);
505 addHardLinkInfo(&tbInfo->hlInfoHead, statbuf, header_name);
506 }
507 }
508
509 /* It is a bad idea to store the archive we are in the process of creating,
510 * so check the device and inode to be sure that this particular file isn't
511 * the new tarball */
512 if (tbInfo->tarFileStatBuf.st_dev == statbuf->st_dev
513 && tbInfo->tarFileStatBuf.st_ino == statbuf->st_ino
514 ) {
515 bb_error_msg("%s: file is the archive; skipping", fileName);
516 return TRUE;
517 }
518
519 # if !ENABLE_FEATURE_TAR_GNU_EXTENSIONS
520 if (strlen(header_name) >= NAME_SIZE) {
521 bb_simple_error_msg("names longer than "NAME_SIZE_STR" chars not supported");
522 return TRUE;
523 }
524 # endif
525
526 /* Is this a regular file? */
527 if (tbInfo->hlInfo == NULL && S_ISREG(statbuf->st_mode)) {
528 /* open the file we want to archive, and make sure all is well */
529 inputFileFd = open_or_warn(fileName, O_RDONLY);
530 if (inputFileFd < 0) {
531 return FALSE; /* make recursive_action() return FALSE */
532 }
533 }
534
535 /* Add an entry to the tarball */
536 if (writeTarHeader(tbInfo, header_name, fileName, statbuf) == FALSE) {
537 return FALSE; /* make recursive_action() return FALSE */
538 }
539
540 /* If it was a regular file, write out the body */
541 if (inputFileFd >= 0) {
542 size_t readSize;
543 /* Write the file to the archive. */
544 /* We record size into header first, */
545 /* and then write out file. If file shrinks in between, */
546 /* tar will be corrupted. So we don't allow for that. */
547 /* NB: GNU tar 1.16 warns and pads with zeroes */
548 /* or even seeks back and updates header */
549 bb_copyfd_exact_size(inputFileFd, tbInfo->tarFd, statbuf->st_size);
550 ////off_t readSize;
551 ////readSize = bb_copyfd_size(inputFileFd, tbInfo->tarFd, statbuf->st_size);
552 ////if (readSize != statbuf->st_size && readSize >= 0) {
553 //// bb_error_msg_and_die("short read from %s, aborting", fileName);
554 ////}
555
556 /* Check that file did not grow in between? */
557 /* if (safe_read(inputFileFd, 1) == 1) warn but continue? */
558
559 close(inputFileFd);
560
561 /* Pad the file up to the tar block size */
562 /* (a few tricks here in the name of code size) */
563 readSize = (-(int)statbuf->st_size) & (TAR_BLOCK_SIZE-1);
564 memset(block_buf, 0, readSize);
565 xwrite(tbInfo->tarFd, block_buf, readSize);
566 }
567
568 return TRUE;
569 }
570
571 # if SEAMLESS_COMPRESSION
572 /* Don't inline: vfork scares gcc and pessimizes code */
vfork_compressor(int tar_fd,const char * gzip)573 static void NOINLINE vfork_compressor(int tar_fd, const char *gzip)
574 {
575 // On Linux, vfork never unpauses parent early, although standard
576 // allows for that. Do we want to waste bytes checking for it?
577 # define WAIT_FOR_CHILD 0
578 volatile int vfork_exec_errno = 0;
579 struct fd_pair data;
580 # if WAIT_FOR_CHILD
581 struct fd_pair status;
582 xpiped_pair(status);
583 # endif
584 xpiped_pair(data);
585
586 signal(SIGPIPE, SIG_IGN); /* we only want EPIPE on errors */
587
588 if (xvfork() == 0) {
589 /* child */
590 int tfd;
591 /* NB: close _first_, then move fds! */
592 close(data.wr);
593 # if WAIT_FOR_CHILD
594 close(status.rd);
595 /* status.wr will close only on exec -
596 * parent waits for this close to happen */
597 fcntl(status.wr, F_SETFD, FD_CLOEXEC);
598 # endif
599 /* copy it: parent's tar_fd variable must not change */
600 tfd = tar_fd;
601 if (tfd == 0) {
602 /* Output tar fd may be zero.
603 * xmove_fd(data.rd, 0) would destroy it.
604 * Reproducer:
605 * exec 0>&-
606 * exec 1>&-
607 * tar czf Z.tar.gz FILE
608 * Swapping move_fd's order wouldn't work:
609 * data.rd is 1 and _it_ would be destroyed.
610 */
611 tfd = dup(tfd);
612 }
613 xmove_fd(data.rd, 0);
614 xmove_fd(tfd, 1);
615
616 /* exec gzip/bzip2/... program */
617 //BB_EXECLP(gzip, gzip, "-f", (char *)0); - WRONG for "xz",
618 // if xz is an enabled applet, it'll be a version which
619 // can only decompress. We do need to execute external
620 // program, not applet.
621 execlp(gzip, gzip, "-f", (char *)0);
622
623 vfork_exec_errno = errno;
624 _exit(EXIT_FAILURE);
625 }
626
627 /* parent */
628 xmove_fd(data.wr, tar_fd);
629 close(data.rd);
630 # if WAIT_FOR_CHILD
631 close(status.wr);
632 while (1) {
633 /* Wait until child execs (or fails to) */
634 char buf;
635 int n = full_read(status.rd, &buf, 1);
636 if (n < 0 /* && errno == EAGAIN */)
637 continue; /* try it again */
638 }
639 close(status.rd);
640 # endif
641 if (vfork_exec_errno) {
642 errno = vfork_exec_errno;
643 bb_perror_msg_and_die("can't execute '%s'", gzip);
644 }
645 }
646 # endif /* SEAMLESS_COMPRESSION */
647
648
649 # if !SEAMLESS_COMPRESSION
650 /* Do not pass gzip flag to writeTarFile() */
651 #define writeTarFile(tbInfo, recurseFlags, filelist, gzip) \
652 writeTarFile(tbInfo, recurseFlags, filelist)
653 # endif
654 /* gcc 4.2.1 inlines it, making code bigger */
writeTarFile(struct TarBallInfo * tbInfo,int recurseFlags,const llist_t * filelist,const char * gzip)655 static NOINLINE int writeTarFile(
656 struct TarBallInfo *tbInfo,
657 int recurseFlags,
658 const llist_t *filelist,
659 const char *gzip)
660 {
661 int errorFlag = FALSE;
662
663 /*tbInfo->hlInfoHead = NULL; - already is */
664
665 /* Store the stat info for the tarball's file, so
666 * can avoid including the tarball into itself.... */
667 xfstat(tbInfo->tarFd, &tbInfo->tarFileStatBuf, "can't stat tar file");
668
669 # if SEAMLESS_COMPRESSION
670 if (gzip)
671 vfork_compressor(tbInfo->tarFd, gzip);
672 # endif
673
674 /* Read the directory/files and iterate over them one at a time */
675 while (filelist) {
676 if (!recursive_action(filelist->data, recurseFlags,
677 writeFileToTarball, writeFileToTarball, tbInfo)
678 ) {
679 errorFlag = TRUE;
680 }
681 filelist = filelist->link;
682 }
683 /* Write two empty blocks to the end of the archive */
684 memset(block_buf, 0, 2*TAR_BLOCK_SIZE);
685 xwrite(tbInfo->tarFd, block_buf, 2*TAR_BLOCK_SIZE);
686
687 /* To be pedantically correct, we would check if the tarball
688 * is smaller than 20 tar blocks, and pad it if it was smaller,
689 * but that isn't necessary for GNU tar interoperability, and
690 * so is considered a waste of space */
691
692 /* Close so the child process (if any) will exit */
693 close(tbInfo->tarFd);
694
695 /* Hang up the tools, close up shop, head home */
696 if (ENABLE_FEATURE_CLEAN_UP)
697 freeHardLinkInfo(&tbInfo->hlInfoHead);
698
699 if (errorFlag)
700 bb_simple_error_msg("error exit delayed from previous errors");
701
702 # if SEAMLESS_COMPRESSION
703 if (gzip) {
704 int status;
705 if (safe_waitpid(-1, &status, 0) == -1)
706 bb_simple_perror_msg("waitpid");
707 else if (!WIFEXITED(status) || WEXITSTATUS(status))
708 /* gzip was killed or has exited with nonzero! */
709 errorFlag = TRUE;
710 }
711 # endif
712 return errorFlag;
713 }
714
715 #endif /* FEATURE_TAR_CREATE */
716
717 #if ENABLE_FEATURE_TAR_FROM
append_file_list_to_list(llist_t * list)718 static llist_t *append_file_list_to_list(llist_t *list)
719 {
720 llist_t *newlist = NULL;
721
722 while (list) {
723 FILE *src_stream;
724 char *line;
725
726 src_stream = xfopen_stdin(llist_pop(&list));
727 while ((line = xmalloc_fgetline(src_stream)) != NULL) {
728 /* kill trailing '/' unless the string is just "/" */
729 char *cp = last_char_is(line, '/');
730 if (cp > line)
731 *cp = '\0';
732 llist_add_to_end(&newlist, line);
733 }
734 fclose(src_stream);
735 }
736 return newlist;
737 }
738 #endif
739
740 //usage:#define tar_trivial_usage
741 //usage: IF_FEATURE_TAR_CREATE("c|") "x|t [-"
742 //usage: IF_FEATURE_SEAMLESS_Z("Z")
743 //usage: IF_FEATURE_SEAMLESS_GZ("z")
744 //usage: IF_FEATURE_SEAMLESS_XZ("J")
745 //usage: IF_FEATURE_SEAMLESS_BZ2("j")
746 //usage: "a"
747 //usage: IF_FEATURE_TAR_CREATE("h")
748 //usage: IF_FEATURE_TAR_NOPRESERVE_TIME("m")
749 //usage: "vokO] "
750 //usage: "[-f TARFILE] [-C DIR] "
751 //usage: IF_FEATURE_TAR_FROM("[-T FILE] [-X FILE] "IF_FEATURE_TAR_LONG_OPTIONS("[LONGOPT]... "))
752 //usage: "[FILE]..."
753 //usage:#define tar_full_usage "\n\n"
754 //usage: IF_FEATURE_TAR_CREATE("Create, extract, ")
755 //usage: IF_NOT_FEATURE_TAR_CREATE("Extract ")
756 //usage: "or list files from a tar file"
757 //usage: "\n"
758 //usage: IF_FEATURE_TAR_CREATE(
759 //usage: "\n c Create"
760 //usage: )
761 //usage: "\n x Extract"
762 //usage: "\n t List"
763 //usage: "\n -f FILE Name of TARFILE ('-' for stdin/out)"
764 //usage: "\n -C DIR Change to DIR before operation"
765 //usage: "\n -v Verbose"
766 //usage: "\n -O Extract to stdout"
767 //usage: IF_FEATURE_TAR_NOPRESERVE_TIME(
768 //usage: "\n -m Don't restore mtime"
769 //usage: )
770 //usage: "\n -o Don't restore user:group"
771 ///////:-p - accepted but ignored, restores mode (aliases in GNU tar: --preserve-permissions, --same-permissions)
772 //usage: "\n -k Don't replace existing files"
773 //usage: IF_FEATURE_SEAMLESS_Z(
774 //usage: "\n -Z (De)compress using compress"
775 //usage: )
776 //usage: IF_FEATURE_SEAMLESS_GZ(
777 //usage: "\n -z (De)compress using gzip"
778 //usage: )
779 //usage: IF_FEATURE_SEAMLESS_XZ(
780 //usage: "\n -J (De)compress using xz"
781 //usage: )
782 //usage: IF_FEATURE_SEAMLESS_BZ2(
783 //usage: "\n -j (De)compress using bzip2"
784 //usage: )
785 //usage: IF_FEATURE_SEAMLESS_LZMA(
786 //usage: IF_FEATURE_TAR_LONG_OPTIONS(
787 //usage: "\n --lzma (De)compress using lzma"
788 //usage: )
789 //usage: )
790 //usage: "\n -a (De)compress based on extension"
791 //usage: IF_FEATURE_TAR_CREATE(
792 //usage: "\n -h Follow symlinks"
793 //usage: )
794 //usage: IF_FEATURE_TAR_FROM(
795 //usage: "\n -T FILE File with names to include"
796 //usage: "\n -X FILE File with glob patterns to exclude"
797 //usage: IF_FEATURE_TAR_LONG_OPTIONS(
798 //usage: "\n --exclude PATTERN Glob pattern to exclude"
799 //usage: )
800 //usage: )
801 //usage: IF_FEATURE_TAR_LONG_OPTIONS(
802 //usage: "\n --overwrite Replace existing files"
803 //usage: "\n --strip-components NUM NUM of leading components to strip"
804 //usage: "\n --no-recursion Don't descend in directories"
805 //usage: "\n --numeric-owner Use numeric user:group"
806 //usage: "\n --no-same-permissions Don't restore access permissions"
807 //usage: IF_FEATURE_TAR_TO_COMMAND(
808 //usage: "\n --to-command COMMAND Pipe files to COMMAND"
809 //usage: )
810 //usage: )
811 //usage:
812 //usage:#define tar_example_usage
813 //usage: "$ zcat /tmp/tarball.tar.gz | tar -xf -\n"
814 //usage: "$ tar -cf /tmp/tarball.tar /usr/local\n"
815
816 enum {
817 OPTBIT_KEEP_OLD = 8,
818 IF_FEATURE_TAR_CREATE( OPTBIT_CREATE ,)
819 IF_FEATURE_TAR_CREATE( OPTBIT_DEREFERENCE ,)
820 IF_FEATURE_SEAMLESS_BZ2( OPTBIT_BZIP2 ,)
821 IF_FEATURE_TAR_FROM( OPTBIT_INCLUDE_FROM,)
822 IF_FEATURE_TAR_FROM( OPTBIT_EXCLUDE_FROM,)
823 IF_FEATURE_SEAMLESS_GZ( OPTBIT_GZIP ,)
824 IF_FEATURE_SEAMLESS_XZ( OPTBIT_XZ ,)
825 IF_FEATURE_SEAMLESS_Z( OPTBIT_COMPRESS ,) // 16th bit
826 OPTBIT_AUTOCOMPRESS_BY_EXT,
827 IF_FEATURE_TAR_NOPRESERVE_TIME(OPTBIT_NOPRESERVE_TIME,)
828 #if ENABLE_FEATURE_TAR_LONG_OPTIONS
829 OPTBIT_STRIP_COMPONENTS,
830 IF_FEATURE_SEAMLESS_LZMA(OPTBIT_LZMA ,)
831 OPTBIT_NORECURSION,
832 IF_FEATURE_TAR_TO_COMMAND(OPTBIT_2COMMAND ,)
833 OPTBIT_NUMERIC_OWNER,
834 OPTBIT_NOPRESERVE_PERM,
835 OPTBIT_OVERWRITE,
836 #endif
837 OPT_TEST = 1 << 0, // t
838 OPT_EXTRACT = 1 << 1, // x
839 OPT_BASEDIR = 1 << 2, // C
840 OPT_TARNAME = 1 << 3, // f
841 OPT_2STDOUT = 1 << 4, // O
842 OPT_NOPRESERVE_OWNER = 1 << 5, // o == no-same-owner
843 OPT_P = 1 << 6, // p
844 OPT_VERBOSE = 1 << 7, // v
845 OPT_KEEP_OLD = 1 << 8, // k
846 OPT_CREATE = IF_FEATURE_TAR_CREATE( (1 << OPTBIT_CREATE )) + 0, // c
847 OPT_DEREFERENCE = IF_FEATURE_TAR_CREATE( (1 << OPTBIT_DEREFERENCE )) + 0, // h
848 OPT_BZIP2 = IF_FEATURE_SEAMLESS_BZ2( (1 << OPTBIT_BZIP2 )) + 0, // j
849 OPT_INCLUDE_FROM = IF_FEATURE_TAR_FROM( (1 << OPTBIT_INCLUDE_FROM)) + 0, // T
850 OPT_EXCLUDE_FROM = IF_FEATURE_TAR_FROM( (1 << OPTBIT_EXCLUDE_FROM)) + 0, // X
851 OPT_GZIP = IF_FEATURE_SEAMLESS_GZ( (1 << OPTBIT_GZIP )) + 0, // z
852 OPT_XZ = IF_FEATURE_SEAMLESS_XZ( (1 << OPTBIT_XZ )) + 0, // J
853 OPT_COMPRESS = IF_FEATURE_SEAMLESS_Z( (1 << OPTBIT_COMPRESS )) + 0, // Z
854 OPT_AUTOCOMPRESS_BY_EXT = 1 << OPTBIT_AUTOCOMPRESS_BY_EXT, // a
855 OPT_NOPRESERVE_TIME = IF_FEATURE_TAR_NOPRESERVE_TIME((1 << OPTBIT_NOPRESERVE_TIME)) + 0, // m
856 OPT_STRIP_COMPONENTS = IF_FEATURE_TAR_LONG_OPTIONS((1 << OPTBIT_STRIP_COMPONENTS)) + 0, // strip-components
857 OPT_LZMA = IF_FEATURE_TAR_LONG_OPTIONS(IF_FEATURE_SEAMLESS_LZMA((1 << OPTBIT_LZMA))) + 0, // lzma
858 OPT_NORECURSION = IF_FEATURE_TAR_LONG_OPTIONS((1 << OPTBIT_NORECURSION )) + 0, // no-recursion
859 OPT_2COMMAND = IF_FEATURE_TAR_TO_COMMAND( (1 << OPTBIT_2COMMAND )) + 0, // to-command
860 OPT_NUMERIC_OWNER = IF_FEATURE_TAR_LONG_OPTIONS((1 << OPTBIT_NUMERIC_OWNER )) + 0, // numeric-owner
861 OPT_NOPRESERVE_PERM = IF_FEATURE_TAR_LONG_OPTIONS((1 << OPTBIT_NOPRESERVE_PERM)) + 0, // no-same-permissions
862 OPT_OVERWRITE = IF_FEATURE_TAR_LONG_OPTIONS((1 << OPTBIT_OVERWRITE )) + 0, // overwrite
863
864 OPT_ANY_COMPRESS = (OPT_BZIP2 | OPT_LZMA | OPT_GZIP | OPT_XZ | OPT_COMPRESS),
865 };
866 #if ENABLE_FEATURE_TAR_LONG_OPTIONS
867 static const char tar_longopts[] ALIGN1 =
868 "list\0" No_argument "t"
869 "extract\0" No_argument "x"
870 "directory\0" Required_argument "C"
871 "file\0" Required_argument "f"
872 "to-stdout\0" No_argument "O"
873 /* do not restore owner */
874 /* Note: GNU tar handles 'o' as no-same-owner only on extract,
875 * on create, 'o' is --old-archive. We do not support --old-archive. */
876 "no-same-owner\0" No_argument "o"
877 "same-permissions\0" No_argument "p"
878 "verbose\0" No_argument "v"
879 "keep-old\0" No_argument "k"
880 # if ENABLE_FEATURE_TAR_CREATE
881 "create\0" No_argument "c"
882 "dereference\0" No_argument "h"
883 # endif
884 # if ENABLE_FEATURE_SEAMLESS_BZ2
885 "bzip2\0" No_argument "j"
886 # endif
887 # if ENABLE_FEATURE_TAR_FROM
888 "files-from\0" Required_argument "T"
889 "exclude-from\0" Required_argument "X"
890 # endif
891 # if ENABLE_FEATURE_SEAMLESS_GZ
892 "gzip\0" No_argument "z"
893 # endif
894 # if ENABLE_FEATURE_SEAMLESS_XZ
895 "xz\0" No_argument "J"
896 # endif
897 # if ENABLE_FEATURE_SEAMLESS_Z
898 "compress\0" No_argument "Z"
899 # endif
900 "auto-compress\0" No_argument "a"
901 # if ENABLE_FEATURE_TAR_NOPRESERVE_TIME
902 "touch\0" No_argument "m"
903 # endif
904 "strip-components\0" Required_argument "\xf8"
905 # if ENABLE_FEATURE_SEAMLESS_LZMA
906 "lzma\0" No_argument "\xf9"
907 # endif
908 "no-recursion\0" No_argument "\xfa"
909 # if ENABLE_FEATURE_TAR_TO_COMMAND
910 "to-command\0" Required_argument "\xfb"
911 # endif
912 /* use numeric uid/gid from tar header, not textual */
913 "numeric-owner\0" No_argument "\xfc"
914 /* do not restore mode */
915 "no-same-permissions\0" No_argument "\xfd"
916 /* on unpack, open with O_TRUNC and !O_EXCL */
917 "overwrite\0" No_argument "\xfe"
918 /* --exclude takes next bit position in option mask, */
919 /* therefore we have to put it _after_ --no-same-permissions */
920 # if ENABLE_FEATURE_TAR_FROM
921 "exclude\0" Required_argument "\xff"
922 # endif
923 ;
924 # define GETOPT32 getopt32long
925 # define LONGOPTS ,tar_longopts
926 #else
927 # define GETOPT32 getopt32
928 # define LONGOPTS
929 #endif
930
931 int tar_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
tar_main(int argc UNUSED_PARAM,char ** argv)932 int tar_main(int argc UNUSED_PARAM, char **argv)
933 {
934 archive_handle_t *tar_handle;
935 char *base_dir = NULL;
936 const char *tar_filename = "-";
937 unsigned opt;
938 int verboseFlag = 0;
939 #if ENABLE_FEATURE_TAR_LONG_OPTIONS && ENABLE_FEATURE_TAR_FROM
940 llist_t *excludes = NULL;
941 #endif
942 INIT_G();
943
944 /* Initialise default values */
945 tar_handle = init_handle();
946 tar_handle->ah_flags = ARCHIVE_CREATE_LEADING_DIRS
947 | ARCHIVE_RESTORE_DATE
948 | ARCHIVE_UNLINK_OLD;
949
950 /* Apparently only root's tar preserves perms (see bug 3844) */
951 if (getuid() != 0)
952 tar_handle->ah_flags |= ARCHIVE_DONT_RESTORE_PERM;
953
954 #if ENABLE_DESKTOP
955 /* Lie to buildroot when it starts asking stupid questions. */
956 if (argv[1] && strcmp(argv[1], "--version") == 0) {
957 // Output of 'tar --version' examples:
958 // tar (GNU tar) 1.15.1
959 // tar (GNU tar) 1.25
960 // bsdtar 2.8.3 - libarchive 2.8.3
961 puts("tar (busybox) " BB_VER);
962 return 0;
963 }
964 #endif
965 if (argv[1] && argv[1][0] != '-' && argv[1][0] != '\0') {
966 /* Compat:
967 * 1st argument without dash handles options with parameters
968 * differently from dashed one: it takes *next argv[i]*
969 * as parameter even if there are more chars in 1st argument:
970 * "tar fx TARFILE" - "x" is not taken as f's param
971 * but is interpreted as -x option
972 * "tar -xf TARFILE" - dashed equivalent of the above
973 * "tar -fx ..." - "x" is taken as f's param
974 * getopt32 wouldn't handle 1st command correctly.
975 * Unfortunately, people do use such commands.
976 * We massage argv[1] to work around it by moving 'f'
977 * to the end of the string.
978 * More contrived "tar fCx TARFILE DIR" still fails,
979 * but such commands are much less likely to be used.
980 */
981 char *f = strchr(argv[1], 'f');
982 if (f) {
983 while (f[1] != '\0') {
984 *f = f[1];
985 f++;
986 }
987 *f = 'f';
988 }
989 /* Prepend '-' to the first argument */
990 argv[1] = xasprintf("-%s", argv[1]);
991 }
992 opt = GETOPT32(argv, "^"
993 "txC:f:Oopvk"
994 IF_FEATURE_TAR_CREATE( "ch" )
995 IF_FEATURE_SEAMLESS_BZ2( "j" )
996 IF_FEATURE_TAR_FROM( "T:*X:*")
997 IF_FEATURE_SEAMLESS_GZ( "z" )
998 IF_FEATURE_SEAMLESS_XZ( "J" )
999 IF_FEATURE_SEAMLESS_Z( "Z" )
1000 "a"
1001 IF_FEATURE_TAR_NOPRESERVE_TIME("m")
1002 IF_FEATURE_TAR_LONG_OPTIONS("\xf8:") // --strip-components
1003 "\0"
1004 "tt:vv:" // count -t,-v
1005 #if ENABLE_FEATURE_TAR_LONG_OPTIONS && ENABLE_FEATURE_TAR_FROM
1006 "\xff::" // --exclude=PATTERN is a list
1007 #endif
1008 IF_FEATURE_TAR_CREATE("c:") "t:x:" // at least one of these is reqd
1009 IF_FEATURE_TAR_CREATE("c--tx:t--cx:x--ct") // mutually exclusive
1010 IF_NOT_FEATURE_TAR_CREATE("t--x:x--t") // mutually exclusive
1011 #if ENABLE_FEATURE_TAR_LONG_OPTIONS
1012 ":\xf8+" // --strip-components=NUM
1013 #endif
1014 LONGOPTS
1015 , &base_dir // -C dir
1016 , &tar_filename // -f filename
1017 IF_FEATURE_TAR_FROM(, &(tar_handle->accept)) // T
1018 IF_FEATURE_TAR_FROM(, &(tar_handle->reject)) // X
1019 #if ENABLE_FEATURE_TAR_LONG_OPTIONS
1020 , &tar_handle->tar__strip_components // --strip-components
1021 #endif
1022 IF_FEATURE_TAR_TO_COMMAND(, &(tar_handle->tar__to_command)) // --to-command
1023 #if ENABLE_FEATURE_TAR_LONG_OPTIONS && ENABLE_FEATURE_TAR_FROM
1024 , &excludes // --exclude
1025 #endif
1026 , &verboseFlag // combined count for -t and -v
1027 , &verboseFlag // combined count for -t and -v
1028 );
1029 #if DBG_OPTION_PARSING
1030 bb_error_msg("opt: 0x%08x", opt);
1031 # define showopt(o) bb_error_msg("opt & %s(%x):\t%x", #o, o, opt & o);
1032 showopt(OPT_TEST );
1033 showopt(OPT_EXTRACT );
1034 showopt(OPT_BASEDIR );
1035 showopt(OPT_TARNAME );
1036 showopt(OPT_2STDOUT );
1037 showopt(OPT_NOPRESERVE_OWNER);
1038 showopt(OPT_P );
1039 showopt(OPT_VERBOSE );
1040 showopt(OPT_KEEP_OLD );
1041 showopt(OPT_CREATE );
1042 showopt(OPT_DEREFERENCE );
1043 showopt(OPT_BZIP2 );
1044 showopt(OPT_INCLUDE_FROM );
1045 showopt(OPT_EXCLUDE_FROM );
1046 showopt(OPT_GZIP );
1047 showopt(OPT_XZ );
1048 showopt(OPT_COMPRESS );
1049 showopt(OPT_AUTOCOMPRESS_BY_EXT);
1050 showopt(OPT_NOPRESERVE_TIME );
1051 showopt(OPT_STRIP_COMPONENTS);
1052 showopt(OPT_LZMA );
1053 showopt(OPT_NORECURSION );
1054 showopt(OPT_2COMMAND );
1055 showopt(OPT_NUMERIC_OWNER );
1056 showopt(OPT_NOPRESERVE_PERM );
1057 showopt(OPT_OVERWRITE );
1058 showopt(OPT_ANY_COMPRESS );
1059 bb_error_msg("base_dir:'%s'", base_dir);
1060 bb_error_msg("tar_filename:'%s'", tar_filename);
1061 bb_error_msg("verboseFlag:%d", verboseFlag);
1062 bb_error_msg("tar_handle->tar__to_command:'%s'", tar_handle->tar__to_command);
1063 bb_error_msg("tar_handle->tar__strip_components:%u", tar_handle->tar__strip_components);
1064 return 0;
1065 # undef showopt
1066 #endif
1067 argv += optind;
1068
1069 if (verboseFlag)
1070 tar_handle->action_header = header_verbose_list;
1071 if (verboseFlag == 1)
1072 tar_handle->action_header = header_list;
1073
1074 if (opt & OPT_EXTRACT)
1075 tar_handle->action_data = data_extract_all;
1076
1077 if (opt & OPT_2STDOUT)
1078 tar_handle->action_data = data_extract_to_stdout;
1079
1080 if (opt & OPT_2COMMAND) {
1081 putenv((char*)"TAR_FILETYPE=f");
1082 signal(SIGPIPE, SIG_IGN);
1083 tar_handle->action_data = data_extract_to_command;
1084 IF_FEATURE_TAR_TO_COMMAND(tar_handle->tar__to_command_shell = xstrdup(get_shell_name());)
1085 }
1086
1087 if (opt & OPT_KEEP_OLD)
1088 tar_handle->ah_flags &= ~ARCHIVE_UNLINK_OLD;
1089
1090 if (opt & OPT_NUMERIC_OWNER)
1091 tar_handle->ah_flags |= ARCHIVE_NUMERIC_OWNER;
1092
1093 if (opt & OPT_NOPRESERVE_OWNER)
1094 tar_handle->ah_flags |= ARCHIVE_DONT_RESTORE_OWNER;
1095
1096 if (opt & OPT_NOPRESERVE_PERM)
1097 tar_handle->ah_flags |= ARCHIVE_DONT_RESTORE_PERM;
1098
1099 if (opt & OPT_OVERWRITE) {
1100 tar_handle->ah_flags &= ~ARCHIVE_UNLINK_OLD;
1101 tar_handle->ah_flags |= ARCHIVE_O_TRUNC;
1102 }
1103
1104 if (opt & OPT_NOPRESERVE_TIME)
1105 tar_handle->ah_flags &= ~ARCHIVE_RESTORE_DATE;
1106
1107 #if ENABLE_FEATURE_TAR_FROM
1108 /* Convert each -X EXCLFILE to list of to-be-rejected glob patterns */
1109 tar_handle->reject = append_file_list_to_list(tar_handle->reject);
1110 # if ENABLE_FEATURE_TAR_LONG_OPTIONS
1111 /* Append --exclude=GLOBPATTERNs to reject */
1112 if (excludes) {
1113 llist_t **p2next = &tar_handle->reject;
1114 while (*p2next)
1115 p2next = &((*p2next)->link);
1116 *p2next = excludes;
1117 }
1118 # endif
1119 tar_handle->accept = append_file_list_to_list(tar_handle->accept);
1120 #endif
1121
1122 /* Setup an array of filenames to work with */
1123 /* TODO: This is the same as in ar, make a separate function? */
1124 while (*argv) {
1125 /* kill trailing '/' unless the string is just "/" */
1126 char *cp = last_char_is(*argv, '/');
1127 if (cp > *argv)
1128 *cp = '\0';
1129 llist_add_to_end(&tar_handle->accept, *argv);
1130 argv++;
1131 }
1132
1133 if (tar_handle->accept || tar_handle->reject)
1134 tar_handle->filter = filter_accept_reject_list;
1135
1136 /* Open the tar file */
1137 {
1138 int tar_fd = STDIN_FILENO;
1139 int flags = O_RDONLY;
1140
1141 if (opt & OPT_CREATE) {
1142 /* Make sure there is at least one file to tar up */
1143 if (tar_handle->accept == NULL)
1144 bb_simple_error_msg_and_die("empty archive");
1145
1146 tar_fd = STDOUT_FILENO;
1147 /* Mimicking GNU tar 1.15.1: */
1148 flags = O_WRONLY | O_CREAT | O_TRUNC;
1149 }
1150
1151 if (LONE_DASH(tar_filename)) {
1152 tar_handle->src_fd = tar_fd;
1153 tar_handle->seek = seek_by_read;
1154 } else
1155 if (ENABLE_FEATURE_TAR_AUTODETECT
1156 && ENABLE_FEATURE_SEAMLESS_LZMA
1157 && flags == O_RDONLY
1158 && !(opt & OPT_ANY_COMPRESS)
1159 && is_suffixed_with(tar_filename, ".lzma")
1160 /* We do this only for .lzma files, they have no signature.
1161 * All other compression formats are recognized in
1162 * get_header_tar() when first tar block has invalid format.
1163 * Doing it here for all filenames would falsely trigger
1164 * on e.g. tarball with 1st file named "BZh5".
1165 */
1166 ) {
1167 tar_handle->src_fd = open_zipped(tar_filename, /*fail_if_not_compressed:*/ 0);
1168 if (tar_handle->src_fd < 0)
1169 bb_perror_msg_and_die("can't open '%s'", tar_filename);
1170 } else {
1171 tar_handle->src_fd = xopen(tar_filename, flags);
1172 #if ENABLE_FEATURE_TAR_CREATE
1173 if ((OPT_GZIP | OPT_BZIP2 | OPT_XZ | OPT_LZMA) != 0 /* at least one is config-enabled */
1174 && (opt & OPT_AUTOCOMPRESS_BY_EXT)
1175 && flags != O_RDONLY
1176 ) {
1177 if (OPT_GZIP != 0 && is_suffixed_with(tar_filename, "gz"))
1178 opt |= OPT_GZIP;
1179 if (OPT_BZIP2 != 0 && is_suffixed_with(tar_filename, "bz2"))
1180 opt |= OPT_BZIP2;
1181 if (OPT_XZ != 0 && is_suffixed_with(tar_filename, "xz"))
1182 opt |= OPT_XZ;
1183 if (OPT_LZMA != 0 && is_suffixed_with(tar_filename, "lzma"))
1184 opt |= OPT_LZMA;
1185 }
1186 #endif
1187 }
1188 }
1189
1190 if (base_dir)
1191 xchdir(base_dir);
1192
1193 #if ENABLE_FEATURE_TAR_CREATE
1194 /* Create an archive */
1195 if (opt & OPT_CREATE) {
1196 struct TarBallInfo *tbInfo;
1197 # if SEAMLESS_COMPRESSION
1198 const char *zipMode = NULL;
1199 if (opt & OPT_COMPRESS)
1200 zipMode = "compress";
1201 if (opt & OPT_GZIP)
1202 zipMode = "gzip";
1203 if (opt & OPT_BZIP2)
1204 zipMode = "bzip2";
1205 if (opt & OPT_LZMA)
1206 zipMode = "lzma";
1207 if (opt & OPT_XZ)
1208 zipMode = "xz";
1209 # endif
1210 tbInfo = xzalloc(sizeof(*tbInfo));
1211 tbInfo->tarFd = tar_handle->src_fd;
1212 tbInfo->verboseFlag = verboseFlag;
1213 # if ENABLE_FEATURE_TAR_FROM
1214 tbInfo->excludeList = tar_handle->reject;
1215 # endif
1216 /* NB: writeTarFile() closes tar_handle->src_fd */
1217 return writeTarFile(tbInfo,
1218 (opt & OPT_DEREFERENCE ? ACTION_FOLLOWLINKS : 0)
1219 | (opt & OPT_NORECURSION ? 0 : ACTION_RECURSE),
1220 tar_handle->accept,
1221 zipMode);
1222 }
1223 #endif
1224
1225 if (opt & OPT_ANY_COMPRESS) {
1226 USE_FOR_MMU(IF_DESKTOP(long long) int FAST_FUNC (*xformer)(transformer_state_t *xstate);)
1227 USE_FOR_NOMMU(const char *xformer_prog;)
1228
1229 if (opt & OPT_COMPRESS) {
1230 USE_FOR_MMU(IF_FEATURE_SEAMLESS_Z(xformer = unpack_Z_stream;))
1231 USE_FOR_NOMMU(xformer_prog = "uncompress";)
1232 }
1233 if (opt & OPT_GZIP) {
1234 USE_FOR_MMU(IF_FEATURE_SEAMLESS_GZ(xformer = unpack_gz_stream;))
1235 USE_FOR_NOMMU(xformer_prog = "gunzip";)
1236 }
1237 if (opt & OPT_BZIP2) {
1238 USE_FOR_MMU(IF_FEATURE_SEAMLESS_BZ2(xformer = unpack_bz2_stream;))
1239 USE_FOR_NOMMU(xformer_prog = "bunzip2";)
1240 }
1241 if (opt & OPT_LZMA) {
1242 USE_FOR_MMU(IF_FEATURE_SEAMLESS_LZMA(xformer = unpack_lzma_stream;))
1243 USE_FOR_NOMMU(xformer_prog = "unlzma";)
1244 }
1245 if (opt & OPT_XZ) {
1246 USE_FOR_MMU(IF_FEATURE_SEAMLESS_XZ(xformer = unpack_xz_stream;))
1247 USE_FOR_NOMMU(xformer_prog = "unxz";)
1248 }
1249
1250 fork_transformer_with_sig(tar_handle->src_fd, xformer, xformer_prog);
1251 /* Can't lseek over pipes */
1252 tar_handle->seek = seek_by_read;
1253 /*tar_handle->offset = 0; - already is */
1254 }
1255
1256 /* Zero processed headers (== empty file) is not a valid tarball.
1257 * We (ab)use bb_got_signal as exitcode here,
1258 * because check_errors_in_children() uses _it_ as error indicator.
1259 */
1260 bb_got_signal = EXIT_FAILURE;
1261
1262 while (get_header_tar(tar_handle) == EXIT_SUCCESS)
1263 bb_got_signal = EXIT_SUCCESS; /* saw at least one header, good */
1264
1265 create_links_from_list(tar_handle->link_placeholders);
1266
1267 /* Check that every file that should have been extracted was */
1268 while (tar_handle->accept) {
1269 if (!find_list_entry(tar_handle->reject, tar_handle->accept->data)
1270 && !find_list_entry(tar_handle->passed, tar_handle->accept->data)
1271 ) {
1272 bb_error_msg_and_die("%s: not found in archive",
1273 tar_handle->accept->data);
1274 }
1275 tar_handle->accept = tar_handle->accept->link;
1276 }
1277 if (ENABLE_FEATURE_CLEAN_UP /* && tar_handle->src_fd != STDIN_FILENO */)
1278 close(tar_handle->src_fd);
1279
1280 if (SEAMLESS_COMPRESSION || OPT_COMPRESS) {
1281 /* Set bb_got_signal to 1 if a child died with !0 exitcode */
1282 check_errors_in_children(0);
1283 }
1284
1285 return bb_got_signal;
1286 }
1287