source: MondoRescue/branches/2.2.9/mindi-busybox/archival/tar.c@ 2142

Last change on this file since 2142 was 1765, checked in by Bruno Cornec, 16 years ago

Update to busybox 1.7.2
File size: 28.3 KB
Line 
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 * Glenn McGrath <bug1@iinet.net.au>
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 the 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 tarball for details.
24 */
25
26#include <fnmatch.h>
27#include <getopt.h>
28#include "libbb.h"
29#include "unarchive.h"
30
31#define block_buf bb_common_bufsiz1
32
33#if ENABLE_FEATURE_TAR_CREATE
34
35/* Tar file constants */
36
37#define TAR_BLOCK_SIZE 512
38
39/* POSIX tar Header Block, from POSIX 1003.1-1990 */
40#define NAME_SIZE 100
41#define NAME_SIZE_STR "100"
42typedef struct TarHeader TarHeader;
43struct TarHeader { /* byte offset */
44 char name[NAME_SIZE]; /* 0-99 */
45 char mode[8]; /* 100-107 */
46 char uid[8]; /* 108-115 */
47 char gid[8]; /* 116-123 */
48 char size[12]; /* 124-135 */
49 char mtime[12]; /* 136-147 */
50 char chksum[8]; /* 148-155 */
51 char typeflag; /* 156-156 */
52 char linkname[NAME_SIZE]; /* 157-256 */
53 char magic[6]; /* 257-262 */
54 char version[2]; /* 263-264 */
55 char uname[32]; /* 265-296 */
56 char gname[32]; /* 297-328 */
57 char devmajor[8]; /* 329-336 */
58 char devminor[8]; /* 337-344 */
59 char prefix[155]; /* 345-499 */
60 char padding[12]; /* 500-512 (pad to exactly the TAR_BLOCK_SIZE) */
61};
62
63/*
64** writeTarFile(), writeFileToTarball(), and writeTarHeader() are
65** the only functions that deal with the HardLinkInfo structure.
66** Even these functions use the xxxHardLinkInfo() functions.
67*/
68typedef struct HardLinkInfo HardLinkInfo;
69struct HardLinkInfo {
70 HardLinkInfo *next; /* Next entry in list */
71 dev_t dev; /* Device number */
72 ino_t ino; /* Inode number */
73 short linkCount; /* (Hard) Link Count */
74 char name[1]; /* Start of filename (must be last) */
75};
76
77/* Some info to be carried along when creating a new tarball */
78typedef struct TarBallInfo TarBallInfo;
79struct TarBallInfo {
80 int tarFd; /* Open-for-write file descriptor
81 for the tarball */
82 struct stat statBuf; /* Stat info for the tarball, letting
83 us know the inode and device that the
84 tarball lives, so we can avoid trying
85 to include the tarball into itself */
86 int verboseFlag; /* Whether to print extra stuff or not */
87 const llist_t *excludeList; /* List of files to not include */
88 HardLinkInfo *hlInfoHead; /* Hard Link Tracking Information */
89 HardLinkInfo *hlInfo; /* Hard Link Info for the current file */
90};
91
92/* A nice enum with all the possible tar file content types */
93enum TarFileType {
94 REGTYPE = '0', /* regular file */
95 REGTYPE0 = '\0', /* regular file (ancient bug compat) */
96 LNKTYPE = '1', /* hard link */
97 SYMTYPE = '2', /* symbolic link */
98 CHRTYPE = '3', /* character special */
99 BLKTYPE = '4', /* block special */
100 DIRTYPE = '5', /* directory */
101 FIFOTYPE = '6', /* FIFO special */
102 CONTTYPE = '7', /* reserved */
103 GNULONGLINK = 'K', /* GNU long (>100 chars) link name */
104 GNULONGNAME = 'L', /* GNU long (>100 chars) file name */
105};
106typedef enum TarFileType TarFileType;
107
108/* Might be faster (and bigger) if the dev/ino were stored in numeric order;) */
109static void addHardLinkInfo(HardLinkInfo ** hlInfoHeadPtr,
110 struct stat *statbuf,
111 const char *fileName)
112{
113 /* Note: hlInfoHeadPtr can never be NULL! */
114 HardLinkInfo *hlInfo;
115
116 hlInfo = xmalloc(sizeof(HardLinkInfo) + strlen(fileName));
117 hlInfo->next = *hlInfoHeadPtr;
118 *hlInfoHeadPtr = hlInfo;
119 hlInfo->dev = statbuf->st_dev;
120 hlInfo->ino = statbuf->st_ino;
121 hlInfo->linkCount = statbuf->st_nlink;
122 strcpy(hlInfo->name, fileName);
123}
124
125static void freeHardLinkInfo(HardLinkInfo ** hlInfoHeadPtr)
126{
127 HardLinkInfo *hlInfo;
128 HardLinkInfo *hlInfoNext;
129
130 if (hlInfoHeadPtr) {
131 hlInfo = *hlInfoHeadPtr;
132 while (hlInfo) {
133 hlInfoNext = hlInfo->next;
134 free(hlInfo);
135 hlInfo = hlInfoNext;
136 }
137 *hlInfoHeadPtr = NULL;
138 }
139}
140
141/* Might be faster (and bigger) if the dev/ino were stored in numeric order;) */
142static HardLinkInfo *findHardLinkInfo(HardLinkInfo * hlInfo, struct stat *statbuf)
143{
144 while (hlInfo) {
145 if ((statbuf->st_ino == hlInfo->ino) && (statbuf->st_dev == hlInfo->dev))
146 break;
147 hlInfo = hlInfo->next;
148 }
149 return hlInfo;
150}
151
152/* Put an octal string into the specified buffer.
153 * The number is zero padded and possibly null terminated.
154 * Stores low-order bits only if whole value does not fit. */
155static void putOctal(char *cp, int len, off_t value)
156{
157 char tempBuffer[sizeof(off_t)*3+1];
158 char *tempString = tempBuffer;
159 int width;
160
161 width = sprintf(tempBuffer, "%0*"OFF_FMT"o", len, value);
162 tempString += (width - len);
163
164 /* If string has leading zeroes, we can drop one */
165 /* and field will have trailing '\0' */
166 /* (increases chances of compat with other tars) */
167 if (tempString[0] == '0')
168 tempString++;
169
170 /* Copy the string to the field */
171 memcpy(cp, tempString, len);
172}
173#define PUT_OCTAL(a, b) putOctal((a), sizeof(a), (b))
174
175static void chksum_and_xwrite(int fd, struct TarHeader* hp)
176{
177 /* POSIX says that checksum is done on unsigned bytes
178 * (Sun and HP-UX gets it wrong... more details in
179 * GNU tar source) */
180 const unsigned char *cp;
181 int chksum, size;
182
183 strcpy(hp->magic, "ustar ");
184
185 /* Calculate and store the checksum (i.e., the sum of all of the bytes of
186 * the header). The checksum field must be filled with blanks for the
187 * calculation. The checksum field is formatted differently from the
188 * other fields: it has 6 digits, a null, then a space -- rather than
189 * digits, followed by a null like the other fields... */
190 memset(hp->chksum, ' ', sizeof(hp->chksum));
191 cp = (const unsigned char *) hp;
192 chksum = 0;
193 size = sizeof(*hp);
194 do { chksum += *cp++; } while (--size);
195 putOctal(hp->chksum, sizeof(hp->chksum)-1, chksum);
196
197 /* Now write the header out to disk */
198 xwrite(fd, hp, sizeof(*hp));
199}
200
201#if ENABLE_FEATURE_TAR_GNU_EXTENSIONS
202static void writeLongname(int fd, int type, const char *name, int dir)
203{
204 static const struct {
205 char mode[8]; /* 100-107 */
206 char uid[8]; /* 108-115 */
207 char gid[8]; /* 116-123 */
208 char size[12]; /* 124-135 */
209 char mtime[12]; /* 136-147 */
210 } prefilled = {
211 "0000000",
212 "0000000",
213 "0000000",
214 "00000000000",
215 "00000000000",
216 };
217 struct TarHeader header;
218 int size;
219
220 dir = !!dir; /* normalize: 0/1 */
221 size = strlen(name) + 1 + dir; /* GNU tar uses strlen+1 */
222 /* + dir: account for possible '/' */
223
224 memset(&header, 0, sizeof(header));
225 strcpy(header.name, "././@LongLink");
226 memcpy(header.mode, prefilled.mode, sizeof(prefilled));
227 PUT_OCTAL(header.size, size);
228 header.typeflag = type;
229 chksum_and_xwrite(fd, &header);
230
231 /* Write filename[/] and pad the block. */
232 /* dir=0: writes 'name<NUL>', pads */
233 /* dir=1: writes 'name', writes '/<NUL>', pads */
234 dir *= 2;
235 xwrite(fd, name, size - dir);
236 xwrite(fd, "/", dir);
237 size = (-size) & (TAR_BLOCK_SIZE-1);
238 memset(&header, 0, size);
239 xwrite(fd, &header, size);
240}
241#endif
242
243/* Write out a tar header for the specified file/directory/whatever */
244void BUG_tar_header_size(void);
245static int writeTarHeader(struct TarBallInfo *tbInfo,
246 const char *header_name, const char *fileName, struct stat *statbuf)
247{
248 struct TarHeader header;
249
250 if (sizeof(header) != 512)
251 BUG_tar_header_size();
252
253 memset(&header, 0, sizeof(struct TarHeader));
254
255 strncpy(header.name, header_name, sizeof(header.name));
256
257 /* POSIX says to mask mode with 07777. */
258 PUT_OCTAL(header.mode, statbuf->st_mode & 07777);
259 PUT_OCTAL(header.uid, statbuf->st_uid);
260 PUT_OCTAL(header.gid, statbuf->st_gid);
261 memset(header.size, '0', sizeof(header.size)-1); /* Regular file size is handled later */
262 PUT_OCTAL(header.mtime, statbuf->st_mtime);
263
264 /* Enter the user and group names */
265 safe_strncpy(header.uname, get_cached_username(statbuf->st_uid), sizeof(header.uname));
266 safe_strncpy(header.gname, get_cached_groupname(statbuf->st_gid), sizeof(header.gname));
267
268 if (tbInfo->hlInfo) {
269 /* This is a hard link */
270 header.typeflag = LNKTYPE;
271 strncpy(header.linkname, tbInfo->hlInfo->name,
272 sizeof(header.linkname));
273#if ENABLE_FEATURE_TAR_GNU_EXTENSIONS
274 /* Write out long linkname if needed */
275 if (header.linkname[sizeof(header.linkname)-1])
276 writeLongname(tbInfo->tarFd, GNULONGLINK,
277 tbInfo->hlInfo->name, 0);
278#endif
279 } else if (S_ISLNK(statbuf->st_mode)) {
280 char *lpath = xmalloc_readlink_or_warn(fileName);
281 if (!lpath)
282 return FALSE;
283 header.typeflag = SYMTYPE;
284 strncpy(header.linkname, lpath, sizeof(header.linkname));
285#if ENABLE_FEATURE_TAR_GNU_EXTENSIONS
286 /* Write out long linkname if needed */
287 if (header.linkname[sizeof(header.linkname)-1])
288 writeLongname(tbInfo->tarFd, GNULONGLINK, lpath, 0);
289#else
290 /* If it is larger than 100 bytes, bail out */
291 if (header.linkname[sizeof(header.linkname)-1]) {
292 free(lpath);
293 bb_error_msg("names longer than "NAME_SIZE_STR" chars not supported");
294 return FALSE;
295 }
296#endif
297 free(lpath);
298 } else if (S_ISDIR(statbuf->st_mode)) {
299 header.typeflag = DIRTYPE;
300 /* Append '/' only if there is a space for it */
301 if (!header.name[sizeof(header.name)-1])
302 header.name[strlen(header.name)] = '/';
303 } else if (S_ISCHR(statbuf->st_mode)) {
304 header.typeflag = CHRTYPE;
305 PUT_OCTAL(header.devmajor, major(statbuf->st_rdev));
306 PUT_OCTAL(header.devminor, minor(statbuf->st_rdev));
307 } else if (S_ISBLK(statbuf->st_mode)) {
308 header.typeflag = BLKTYPE;
309 PUT_OCTAL(header.devmajor, major(statbuf->st_rdev));
310 PUT_OCTAL(header.devminor, minor(statbuf->st_rdev));
311 } else if (S_ISFIFO(statbuf->st_mode)) {
312 header.typeflag = FIFOTYPE;
313 } else if (S_ISREG(statbuf->st_mode)) {
314 if (sizeof(statbuf->st_size) > 4
315 && statbuf->st_size > (off_t)0777777777777LL
316 ) {
317 bb_error_msg_and_die("cannot store file '%s' "
318 "of size %"OFF_FMT"d, aborting",
319 fileName, statbuf->st_size);
320 }
321 header.typeflag = REGTYPE;
322 PUT_OCTAL(header.size, statbuf->st_size);
323 } else {
324 bb_error_msg("%s: unknown file type", fileName);
325 return FALSE;
326 }
327
328#if ENABLE_FEATURE_TAR_GNU_EXTENSIONS
329 /* Write out long name if needed */
330 /* (we, like GNU tar, output long linkname *before* long name) */
331 if (header.name[sizeof(header.name)-1])
332 writeLongname(tbInfo->tarFd, GNULONGNAME,
333 header_name, S_ISDIR(statbuf->st_mode));
334#endif
335
336 /* Now write the header out to disk */
337 chksum_and_xwrite(tbInfo->tarFd, &header);
338
339 /* Now do the verbose thing (or not) */
340 if (tbInfo->verboseFlag) {
341 FILE *vbFd = stdout;
342
343 if (tbInfo->tarFd == STDOUT_FILENO) /* If the archive goes to stdout, verbose to stderr */
344 vbFd = stderr;
345 /* GNU "tar cvvf" prints "extended" listing a-la "ls -l" */
346 /* We don't have such excesses here: for us "v" == "vv" */
347 /* '/' is probably a GNUism */
348 fprintf(vbFd, "%s%s\n", header_name,
349 S_ISDIR(statbuf->st_mode) ? "/" : "");
350 }
351
352 return TRUE;
353}
354
355#if ENABLE_FEATURE_TAR_FROM
356static int exclude_file(const llist_t *excluded_files, const char *file)
357{
358 while (excluded_files) {
359 if (excluded_files->data[0] == '/') {
360 if (fnmatch(excluded_files->data, file,
361 FNM_PATHNAME | FNM_LEADING_DIR) == 0)
362 return 1;
363 } else {
364 const char *p;
365
366 for (p = file; p[0] != '\0'; p++) {
367 if ((p == file || p[-1] == '/') && p[0] != '/' &&
368 fnmatch(excluded_files->data, p,
369 FNM_PATHNAME | FNM_LEADING_DIR) == 0)
370 return 1;
371 }
372 }
373 excluded_files = excluded_files->link;
374 }
375
376 return 0;
377}
378#else
379#define exclude_file(excluded_files, file) 0
380#endif
381
382static int writeFileToTarball(const char *fileName, struct stat *statbuf,
383 void *userData, int depth ATTRIBUTE_UNUSED)
384{
385 struct TarBallInfo *tbInfo = (struct TarBallInfo *) userData;
386 const char *header_name;
387 int inputFileFd = -1;
388
389 /*
390 * Check to see if we are dealing with a hard link.
391 * If so -
392 * Treat the first occurance of a given dev/inode as a file while
393 * treating any additional occurances as hard links. This is done
394 * by adding the file information to the HardLinkInfo linked list.
395 */
396 tbInfo->hlInfo = NULL;
397 if (statbuf->st_nlink > 1) {
398 tbInfo->hlInfo = findHardLinkInfo(tbInfo->hlInfoHead, statbuf);
399 if (tbInfo->hlInfo == NULL)
400 addHardLinkInfo(&tbInfo->hlInfoHead, statbuf, fileName);
401 }
402
403 /* It is against the rules to archive a socket */
404 if (S_ISSOCK(statbuf->st_mode)) {
405 bb_error_msg("%s: socket ignored", fileName);
406 return TRUE;
407 }
408
409 /* It is a bad idea to store the archive we are in the process of creating,
410 * so check the device and inode to be sure that this particular file isn't
411 * the new tarball */
412 if (tbInfo->statBuf.st_dev == statbuf->st_dev &&
413 tbInfo->statBuf.st_ino == statbuf->st_ino) {
414 bb_error_msg("%s: file is the archive; skipping", fileName);
415 return TRUE;
416 }
417
418 header_name = fileName;
419 while (header_name[0] == '/') {
420 static smallint warned;
421
422 if (!warned) {
423 bb_error_msg("removing leading '/' from member names");
424 warned = 1;
425 }
426 header_name++;
427 }
428
429#if !ENABLE_FEATURE_TAR_GNU_EXTENSIONS
430 if (strlen(fileName) >= NAME_SIZE) {
431 bb_error_msg("names longer than "NAME_SIZE_STR" chars not supported");
432 return TRUE;
433 }
434#endif
435
436 if (header_name[0] == '\0')
437 return TRUE;
438
439 if (exclude_file(tbInfo->excludeList, header_name))
440 return SKIP;
441
442 /* Is this a regular file? */
443 if (tbInfo->hlInfo == NULL && S_ISREG(statbuf->st_mode)) {
444 /* open the file we want to archive, and make sure all is well */
445 inputFileFd = open_or_warn(fileName, O_RDONLY);
446 if (inputFileFd < 0) {
447 return FALSE;
448 }
449 }
450
451 /* Add an entry to the tarball */
452 if (writeTarHeader(tbInfo, header_name, fileName, statbuf) == FALSE) {
453 return FALSE;
454 }
455
456 /* If it was a regular file, write out the body */
457 if (inputFileFd >= 0) {
458 size_t readSize;
459 /* Write the file to the archive. */
460 /* We record size into header first, */
461 /* and then write out file. If file shrinks in between, */
462 /* tar will be corrupted. So we don't allow for that. */
463 /* NB: GNU tar 1.16 warns and pads with zeroes */
464 /* or even seeks back and updates header */
465 bb_copyfd_exact_size(inputFileFd, tbInfo->tarFd, statbuf->st_size);
466 ////off_t readSize;
467 ////readSize = bb_copyfd_size(inputFileFd, tbInfo->tarFd, statbuf->st_size);
468 ////if (readSize != statbuf->st_size && readSize >= 0) {
469 //// bb_error_msg_and_die("short read from %s, aborting", fileName);
470 ////}
471
472 /* Check that file did not grow in between? */
473 /* if (safe_read(inputFileFd, 1) == 1) warn but continue? */
474
475 close(inputFileFd);
476
477 /* Pad the file up to the tar block size */
478 /* (a few tricks here in the name of code size) */
479 readSize = (-(int)statbuf->st_size) & (TAR_BLOCK_SIZE-1);
480 memset(block_buf, 0, readSize);
481 xwrite(tbInfo->tarFd, block_buf, readSize);
482 }
483
484 return TRUE;
485}
486
487static int writeTarFile(const int tar_fd, const int verboseFlag,
488 const unsigned long dereferenceFlag, const llist_t *include,
489 const llist_t *exclude, const int gzip)
490{
491 pid_t gzipPid = 0;
492 int errorFlag = FALSE;
493 struct TarBallInfo tbInfo;
494
495 tbInfo.hlInfoHead = NULL;
496
497 fchmod(tar_fd, 0644);
498 tbInfo.tarFd = tar_fd;
499 tbInfo.verboseFlag = verboseFlag;
500
501 /* Store the stat info for the tarball's file, so
502 * can avoid including the tarball into itself.... */
503 if (fstat(tbInfo.tarFd, &tbInfo.statBuf) < 0)
504 bb_perror_msg_and_die("cannot stat tar file");
505
506 if ((ENABLE_FEATURE_TAR_GZIP || ENABLE_FEATURE_TAR_BZIP2) && gzip) {
507 int gzipDataPipe[2] = { -1, -1 };
508 int gzipStatusPipe[2] = { -1, -1 };
509 volatile int vfork_exec_errno = 0;
510 const char *zip_exec = (gzip == 1) ? "gzip" : "bzip2";
511
512 xpipe(gzipDataPipe);
513 xpipe(gzipStatusPipe);
514
515 signal(SIGPIPE, SIG_IGN); /* we only want EPIPE on errors */
516
517#if defined(__GNUC__) && __GNUC__
518 /* Avoid vfork clobbering */
519 (void) &include;
520 (void) &errorFlag;
521 (void) &zip_exec;
522#endif
523
524 gzipPid = vfork();
525
526 if (gzipPid == 0) {
527 dup2(gzipDataPipe[0], 0);
528 close(gzipDataPipe[1]);
529
530 dup2(tbInfo.tarFd, 1);
531
532 close(gzipStatusPipe[0]);
533 fcntl(gzipStatusPipe[1], F_SETFD, FD_CLOEXEC); /* close on exec shows success */
534
535 BB_EXECLP(zip_exec, zip_exec, "-f", NULL);
536 vfork_exec_errno = errno;
537
538 close(gzipStatusPipe[1]);
539 exit(-1);
540 } else if (gzipPid > 0) {
541 close(gzipDataPipe[0]);
542 close(gzipStatusPipe[1]);
543
544 while (1) {
545 char buf;
546
547 int n = full_read(gzipStatusPipe[0], &buf, 1);
548
549 if (n == 0 && vfork_exec_errno != 0) {
550 errno = vfork_exec_errno;
551 bb_perror_msg_and_die("cannot exec %s", zip_exec);
552 } else if ((n < 0) && (errno == EAGAIN || errno == EINTR))
553 continue; /* try it again */
554 break;
555 }
556 close(gzipStatusPipe[0]);
557
558 tbInfo.tarFd = gzipDataPipe[1];
559 } else bb_perror_msg_and_die("vfork gzip");
560 }
561
562 tbInfo.excludeList = exclude;
563
564 /* Read the directory/files and iterate over them one at a time */
565 while (include) {
566 if (!recursive_action(include->data, ACTION_RECURSE |
567 (dereferenceFlag ? ACTION_FOLLOWLINKS : 0),
568 writeFileToTarball, writeFileToTarball, &tbInfo, 0))
569 {
570 errorFlag = TRUE;
571 }
572 include = include->link;
573 }
574 /* Write two empty blocks to the end of the archive */
575 memset(block_buf, 0, 2*TAR_BLOCK_SIZE);
576 xwrite(tbInfo.tarFd, block_buf, 2*TAR_BLOCK_SIZE);
577
578 /* To be pedantically correct, we would check if the tarball
579 * is smaller than 20 tar blocks, and pad it if it was smaller,
580 * but that isn't necessary for GNU tar interoperability, and
581 * so is considered a waste of space */
582
583 /* Close so the child process (if any) will exit */
584 close(tbInfo.tarFd);
585
586 /* Hang up the tools, close up shop, head home */
587 if (ENABLE_FEATURE_CLEAN_UP)
588 freeHardLinkInfo(&tbInfo.hlInfoHead);
589
590 if (errorFlag)
591 bb_error_msg("error exit delayed from previous errors");
592
593 if (gzipPid) {
594 int status;
595 if (waitpid(gzipPid, &status, 0) == -1)
596 bb_perror_msg("waitpid");
597 else if (!WIFEXITED(status) || WEXITSTATUS(status))
598 /* gzip was killed or has exited with nonzero! */
599 errorFlag = TRUE;
600 }
601 return errorFlag;
602}
603#else
604int writeTarFile(const int tar_fd, const int verboseFlag,
605 const unsigned long dereferenceFlag, const llist_t *include,
606 const llist_t *exclude, const int gzip);
607#endif /* FEATURE_TAR_CREATE */
608
609#if ENABLE_FEATURE_TAR_FROM
610static llist_t *append_file_list_to_list(llist_t *list)
611{
612 FILE *src_stream;
613 llist_t *cur = list;
614 llist_t *tmp;
615 char *line;
616 llist_t *newlist = NULL;
617
618 while (cur) {
619 src_stream = xfopen(cur->data, "r");
620 tmp = cur;
621 cur = cur->link;
622 free(tmp);
623 while ((line = xmalloc_getline(src_stream)) != NULL) {
624 /* kill trailing '/' unless the string is just "/" */
625 char *cp = last_char_is(line, '/');
626 if (cp > line)
627 *cp = '\0';
628 llist_add_to(&newlist, line);
629 }
630 fclose(src_stream);
631 }
632 return newlist;
633}
634#else
635#define append_file_list_to_list(x) 0
636#endif
637
638#if ENABLE_FEATURE_TAR_COMPRESS
639static char get_header_tar_Z(archive_handle_t *archive_handle)
640{
641 /* Can't lseek over pipes */
642 archive_handle->seek = seek_by_read;
643
644 /* do the decompression, and cleanup */
645 if (xread_char(archive_handle->src_fd) != 0x1f
646 || xread_char(archive_handle->src_fd) != 0x9d
647 ) {
648 bb_error_msg_and_die("invalid magic");
649 }
650
651 archive_handle->src_fd = open_transformer(archive_handle->src_fd, uncompress, "uncompress", "uncompress", "-cf", "-", NULL);
652 archive_handle->offset = 0;
653 while (get_header_tar(archive_handle) == EXIT_SUCCESS)
654 /* nothing */;
655
656 /* Can only do one file at a time */
657 return EXIT_FAILURE;
658}
659#else
660#define get_header_tar_Z NULL
661#endif
662
663#ifdef CHECK_FOR_CHILD_EXITCODE
664/* Looks like it isn't needed - tar detects malformed (truncated)
665 * archive if e.g. bunzip2 fails */
666static int child_error;
667
668static void handle_SIGCHLD(int status)
669{
670 /* Actually, 'status' is a signo. We reuse it for other needs */
671
672 /* Wait for any child without blocking */
673 if (waitpid(-1, &status, WNOHANG) < 0)
674 /* wait failed?! I'm confused... */
675 return;
676
677 if (WIFEXITED(status) && WEXITSTATUS(status)==0)
678 /* child exited with 0 */
679 return;
680 /* Cannot happen?
681 if (!WIFSIGNALED(status) && !WIFEXITED(status)) return; */
682 child_error = 1;
683}
684#endif
685
686enum {
687 OPTBIT_KEEP_OLD = 7,
688 USE_FEATURE_TAR_CREATE( OPTBIT_CREATE ,)
689 USE_FEATURE_TAR_CREATE( OPTBIT_DEREFERENCE ,)
690 USE_FEATURE_TAR_BZIP2( OPTBIT_BZIP2 ,)
691 USE_FEATURE_TAR_LZMA( OPTBIT_LZMA ,)
692 USE_FEATURE_TAR_FROM( OPTBIT_INCLUDE_FROM,)
693 USE_FEATURE_TAR_FROM( OPTBIT_EXCLUDE_FROM,)
694 USE_FEATURE_TAR_GZIP( OPTBIT_GZIP ,)
695 USE_FEATURE_TAR_COMPRESS(OPTBIT_COMPRESS ,)
696 OPTBIT_NOPRESERVE_OWN,
697 OPTBIT_NOPRESERVE_PERM,
698 OPT_TEST = 1 << 0, // t
699 OPT_EXTRACT = 1 << 1, // x
700 OPT_BASEDIR = 1 << 2, // C
701 OPT_TARNAME = 1 << 3, // f
702 OPT_2STDOUT = 1 << 4, // O
703 OPT_P = 1 << 5, // p
704 OPT_VERBOSE = 1 << 6, // v
705 OPT_KEEP_OLD = 1 << 7, // k
706 OPT_CREATE = USE_FEATURE_TAR_CREATE( (1<<OPTBIT_CREATE )) + 0, // c
707 OPT_DEREFERENCE = USE_FEATURE_TAR_CREATE( (1<<OPTBIT_DEREFERENCE )) + 0, // h
708 OPT_BZIP2 = USE_FEATURE_TAR_BZIP2( (1<<OPTBIT_BZIP2 )) + 0, // j
709 OPT_LZMA = USE_FEATURE_TAR_LZMA( (1<<OPTBIT_LZMA )) + 0, // a
710 OPT_INCLUDE_FROM = USE_FEATURE_TAR_FROM( (1<<OPTBIT_INCLUDE_FROM)) + 0, // T
711 OPT_EXCLUDE_FROM = USE_FEATURE_TAR_FROM( (1<<OPTBIT_EXCLUDE_FROM)) + 0, // X
712 OPT_GZIP = USE_FEATURE_TAR_GZIP( (1<<OPTBIT_GZIP )) + 0, // z
713 OPT_COMPRESS = USE_FEATURE_TAR_COMPRESS((1<<OPTBIT_COMPRESS )) + 0, // Z
714 OPT_NOPRESERVE_OWN = 1 << OPTBIT_NOPRESERVE_OWN , // no-same-owner
715 OPT_NOPRESERVE_PERM = 1 << OPTBIT_NOPRESERVE_PERM, // no-same-permissions
716};
717#if ENABLE_FEATURE_TAR_LONG_OPTIONS
718static const char tar_longopts[] ALIGN1 =
719 "list\0" No_argument "t"
720 "extract\0" No_argument "x"
721 "directory\0" Required_argument "C"
722 "file\0" Required_argument "f"
723 "to-stdout\0" No_argument "O"
724 "same-permissions\0" No_argument "p"
725 "verbose\0" No_argument "v"
726 "keep-old\0" No_argument "k"
727# if ENABLE_FEATURE_TAR_CREATE
728 "create\0" No_argument "c"
729 "dereference\0" No_argument "h"
730# endif
731# if ENABLE_FEATURE_TAR_BZIP2
732 "bzip2\0" No_argument "j"
733# endif
734# if ENABLE_FEATURE_TAR_LZMA
735 "lzma\0" No_argument "a"
736# endif
737# if ENABLE_FEATURE_TAR_FROM
738 "files-from\0" Required_argument "T"
739 "exclude-from\0" Required_argument "X"
740# endif
741# if ENABLE_FEATURE_TAR_GZIP
742 "gzip\0" No_argument "z"
743# endif
744# if ENABLE_FEATURE_TAR_COMPRESS
745 "compress\0" No_argument "Z"
746# endif
747 "no-same-owner\0" No_argument "\xfd"
748 "no-same-permissions\0" No_argument "\xfe"
749 /* --exclude takes next bit position in option mask, */
750 /* therefore we have to either put it _after_ --no-same-perm */
751 /* or add OPT[BIT]_EXCLUDE before OPT[BIT]_NOPRESERVE_OWN */
752# if ENABLE_FEATURE_TAR_FROM
753 "exclude\0" Required_argument "\xff"
754# endif
755 ;
756#endif
757
758int tar_main(int argc, char **argv);
759int tar_main(int argc, char **argv)
760{
761 char (*get_header_ptr)(archive_handle_t *) = get_header_tar;
762 archive_handle_t *tar_handle;
763 char *base_dir = NULL;
764 const char *tar_filename = "-";
765 unsigned opt;
766 int verboseFlag = 0;
767#if ENABLE_FEATURE_TAR_LONG_OPTIONS && ENABLE_FEATURE_TAR_FROM
768 llist_t *excludes = NULL;
769#endif
770
771 /* Initialise default values */
772 tar_handle = init_handle();
773 tar_handle->flags = ARCHIVE_CREATE_LEADING_DIRS
774 | ARCHIVE_PRESERVE_DATE
775 | ARCHIVE_EXTRACT_UNCONDITIONAL;
776
777 /* Prepend '-' to the first argument if required */
778 opt_complementary = "--:" // first arg is options
779 "tt:vv:" // count -t,-v
780 "?:" // bail out with usage instead of error return
781 "X::T::" // cumulative lists
782#if ENABLE_FEATURE_TAR_LONG_OPTIONS && ENABLE_FEATURE_TAR_FROM
783 "\xff::" // cumulative lists for --exclude
784#endif
785 USE_FEATURE_TAR_CREATE("c:") "t:x:" // at least one of these is reqd
786 USE_FEATURE_TAR_CREATE("c--tx:t--cx:x--ct") // mutually exclusive
787 SKIP_FEATURE_TAR_CREATE("t--x:x--t"); // mutually exclusive
788#if ENABLE_FEATURE_TAR_LONG_OPTIONS
789 applet_long_options = tar_longopts;
790#endif
791 opt = getopt32(argv,
792 "txC:f:Opvk"
793 USE_FEATURE_TAR_CREATE( "ch" )
794 USE_FEATURE_TAR_BZIP2( "j" )
795 USE_FEATURE_TAR_LZMA( "a" )
796 USE_FEATURE_TAR_FROM( "T:X:")
797 USE_FEATURE_TAR_GZIP( "z" )
798 USE_FEATURE_TAR_COMPRESS("Z" )
799 , &base_dir // -C dir
800 , &tar_filename // -f filename
801 USE_FEATURE_TAR_FROM(, &(tar_handle->accept)) // T
802 USE_FEATURE_TAR_FROM(, &(tar_handle->reject)) // X
803#if ENABLE_FEATURE_TAR_LONG_OPTIONS && ENABLE_FEATURE_TAR_FROM
804 , &excludes // --exclude
805#endif
806 , &verboseFlag // combined count for -t and -v
807 , &verboseFlag // combined count for -t and -v
808 );
809
810 if (verboseFlag) tar_handle->action_header = header_verbose_list;
811 if (verboseFlag == 1) tar_handle->action_header = header_list;
812
813 if (opt & OPT_EXTRACT)
814 tar_handle->action_data = data_extract_all;
815
816 if (opt & OPT_2STDOUT)
817 tar_handle->action_data = data_extract_to_stdout;
818
819 if (opt & OPT_KEEP_OLD)
820 tar_handle->flags &= ~ARCHIVE_EXTRACT_UNCONDITIONAL;
821
822 if (opt & OPT_NOPRESERVE_OWN)
823 tar_handle->flags |= ARCHIVE_NOPRESERVE_OWN;
824
825 if (opt & OPT_NOPRESERVE_PERM)
826 tar_handle->flags |= ARCHIVE_NOPRESERVE_PERM;
827
828 if (opt & OPT_GZIP)
829 get_header_ptr = get_header_tar_gz;
830
831 if (opt & OPT_BZIP2)
832 get_header_ptr = get_header_tar_bz2;
833
834 if (opt & OPT_LZMA)
835 get_header_ptr = get_header_tar_lzma;
836
837 if (opt & OPT_COMPRESS)
838 get_header_ptr = get_header_tar_Z;
839
840#if ENABLE_FEATURE_TAR_FROM
841 tar_handle->reject = append_file_list_to_list(tar_handle->reject);
842#if ENABLE_FEATURE_TAR_LONG_OPTIONS
843 /* Append excludes to reject */
844 while (excludes) {
845 llist_t *next = excludes->link;
846 excludes->link = tar_handle->reject;
847 tar_handle->reject = excludes;
848 excludes = next;
849 }
850#endif
851 tar_handle->accept = append_file_list_to_list(tar_handle->accept);
852#endif
853
854 /* Check if we are reading from stdin */
855 if (argv[optind] && *argv[optind] == '-') {
856 /* Default is to read from stdin, so just skip to next arg */
857 optind++;
858 }
859
860 /* Setup an array of filenames to work with */
861 /* TODO: This is the same as in ar, separate function ? */
862 while (optind < argc) {
863 /* kill trailing '/' unless the string is just "/" */
864 char *cp = last_char_is(argv[optind], '/');
865 if (cp > argv[optind])
866 *cp = '\0';
867 llist_add_to_end(&tar_handle->accept, argv[optind]);
868 optind++;
869 }
870
871 if (tar_handle->accept || tar_handle->reject)
872 tar_handle->filter = filter_accept_reject_list;
873
874 /* Open the tar file */
875 {
876 FILE *tar_stream;
877 int flags;
878
879 if (opt & OPT_CREATE) {
880 /* Make sure there is at least one file to tar up. */
881 if (tar_handle->accept == NULL)
882 bb_error_msg_and_die("empty archive");
883
884 tar_stream = stdout;
885 /* Mimicking GNU tar 1.15.1: */
886 flags = O_WRONLY|O_CREAT|O_TRUNC;
887 /* was doing unlink; open(O_WRONLY|O_CREAT|O_EXCL); why? */
888 } else {
889 tar_stream = stdin;
890 flags = O_RDONLY;
891 }
892
893 if (LONE_DASH(tar_filename)) {
894 tar_handle->src_fd = fileno(tar_stream);
895 tar_handle->seek = seek_by_read;
896 } else {
897 tar_handle->src_fd = xopen(tar_filename, flags);
898 }
899 }
900
901 if (base_dir)
902 xchdir(base_dir);
903
904#ifdef CHECK_FOR_CHILD_EXITCODE
905 /* We need to know whether child (gzip/bzip/etc) exits abnormally */
906 signal(SIGCHLD, handle_SIGCHLD);
907#endif
908
909 /* create an archive */
910 if (opt & OPT_CREATE) {
911 int zipMode = 0;
912 if (ENABLE_FEATURE_TAR_GZIP && get_header_ptr == get_header_tar_gz)
913 zipMode = 1;
914 if (ENABLE_FEATURE_TAR_BZIP2 && get_header_ptr == get_header_tar_bz2)
915 zipMode = 2;
916 /* NB: writeTarFile() closes tar_handle->src_fd */
917 return writeTarFile(tar_handle->src_fd, verboseFlag, opt & OPT_DEREFERENCE,
918 tar_handle->accept,
919 tar_handle->reject, zipMode);
920 }
921
922 while (get_header_ptr(tar_handle) == EXIT_SUCCESS)
923 /* nothing */;
924
925 /* Check that every file that should have been extracted was */
926 while (tar_handle->accept) {
927 if (!find_list_entry(tar_handle->reject, tar_handle->accept->data)
928 && !find_list_entry(tar_handle->passed, tar_handle->accept->data)
929 ) {
930 bb_error_msg_and_die("%s: not found in archive",
931 tar_handle->accept->data);
932 }
933 tar_handle->accept = tar_handle->accept->link;
934 }
935 if (ENABLE_FEATURE_CLEAN_UP /* && tar_handle->src_fd != STDIN_FILENO */)
936 close(tar_handle->src_fd);
937
938 return EXIT_SUCCESS;
939}
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