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1/* vi: set sw=4 ts=4: */
2/*
3 * Mini tar implementation for busybox
4 *
5 * Modifed to use common extraction code used by ar, cpio, dpkg-deb, dpkg
6 * Glenn McGrath <bug1@optushome.com.au>
7 *
8 * Note, that as of BusyBox-0.43, tar has been completely rewritten from the
9 * ground up. It still has remnents of the old code lying about, but it is
10 * very different now (i.e., cleaner, less global variables, etc.)
11 *
12 * Copyright (C) 1999,2000,2001 by Lineo, inc.
13 * Written by Erik Andersen <andersen@lineo.com>, <andersee@debian.org>
14 *
15 * Based in part in the tar implementation in sash
16 * Copyright (c) 1999 by David I. Bell
17 * Permission is granted to use, distribute, or modify this source,
18 * provided that this copyright notice remains intact.
19 * Permission to distribute sash derived code under the GPL has been granted.
20 *
21 * Based in part on the tar implementation from busybox-0.28
22 * Copyright (C) 1995 Bruce Perens
23 * This is free software under the GNU General Public License.
24 *
25 * This program is free software; you can redistribute it and/or modify
26 * it under the terms of the GNU General Public License as published by
27 * the Free Software Foundation; either version 2 of the License, or
28 * (at your option) any later version.
29 *
30 * This program is distributed in the hope that it will be useful,
31 * but WITHOUT ANY WARRANTY; without even the implied warranty of
32 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
33 * General Public License for more details.
34 *
35 * You should have received a copy of the GNU General Public License
36 * along with this program; if not, write to the Free Software
37 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
38 *
39 */
40
41#include <fcntl.h>
42#include <getopt.h>
43#include <search.h>
44#include <stdio.h>
45#include <stdlib.h>
46#include <unistd.h>
47#include <fnmatch.h>
48#include <string.h>
49#include <errno.h>
50#include "busybox.h"
51
52#ifdef BB_FEATURE_TAR_CREATE
53
54/* Tar file constants */
55# define TAR_MAGIC "ustar" /* ustar and a null */
56# define TAR_VERSION " " /* Be compatable with GNU tar format */
57
58# ifndef MAJOR
59# define MAJOR(dev) (((dev)>>8)&0xff)
60# define MINOR(dev) ((dev)&0xff)
61# endif
62
63static const int TAR_BLOCK_SIZE = 512;
64static const int TAR_MAGIC_LEN = 6;
65static const int TAR_VERSION_LEN = 2;
66
67/* POSIX tar Header Block, from POSIX 1003.1-1990 */
68enum { NAME_SIZE = 100 }; /* because gcc won't let me use 'static const int' */
69struct TarHeader
70{ /* byte offset */
71 char name[NAME_SIZE]; /* 0-99 */
72 char mode[8]; /* 100-107 */
73 char uid[8]; /* 108-115 */
74 char gid[8]; /* 116-123 */
75 char size[12]; /* 124-135 */
76 char mtime[12]; /* 136-147 */
77 char chksum[8]; /* 148-155 */
78 char typeflag; /* 156-156 */
79 char linkname[NAME_SIZE]; /* 157-256 */
80 char magic[6]; /* 257-262 */
81 char version[2]; /* 263-264 */
82 char uname[32]; /* 265-296 */
83 char gname[32]; /* 297-328 */
84 char devmajor[8]; /* 329-336 */
85 char devminor[8]; /* 337-344 */
86 char prefix[155]; /* 345-499 */
87 char padding[12]; /* 500-512 (pad to exactly the TAR_BLOCK_SIZE) */
88};
89typedef struct TarHeader TarHeader;
90
91/*
92** writeTarFile(), writeFileToTarball(), and writeTarHeader() are
93** the only functions that deal with the HardLinkInfo structure.
94** Even these functions use the xxxHardLinkInfo() functions.
95*/
96typedef struct HardLinkInfo HardLinkInfo;
97struct HardLinkInfo
98{
99 HardLinkInfo *next; /* Next entry in list */
100 dev_t dev; /* Device number */
101 ino_t ino; /* Inode number */
102 short linkCount; /* (Hard) Link Count */
103 char name[1]; /* Start of filename (must be last) */
104};
105
106/* Some info to be carried along when creating a new tarball */
107struct TarBallInfo
108{
109 char* fileName; /* File name of the tarball */
110 int tarFd; /* Open-for-write file descriptor
111 for the tarball */
112 struct stat statBuf; /* Stat info for the tarball, letting
113 us know the inode and device that the
114 tarball lives, so we can avoid trying
115 to include the tarball into itself */
116 int verboseFlag; /* Whether to print extra stuff or not */
117 char** excludeList; /* List of files to not include */
118 HardLinkInfo *hlInfoHead; /* Hard Link Tracking Information */
119 HardLinkInfo *hlInfo; /* Hard Link Info for the current file */
120};
121typedef struct TarBallInfo TarBallInfo;
122
123/* A nice enum with all the possible tar file content types */
124enum TarFileType
125{
126 REGTYPE = '0', /* regular file */
127 REGTYPE0 = '\0', /* regular file (ancient bug compat)*/
128 LNKTYPE = '1', /* hard link */
129 SYMTYPE = '2', /* symbolic link */
130 CHRTYPE = '3', /* character special */
131 BLKTYPE = '4', /* block special */
132 DIRTYPE = '5', /* directory */
133 FIFOTYPE = '6', /* FIFO special */
134 CONTTYPE = '7', /* reserved */
135 GNULONGLINK = 'K', /* GNU long (>100 chars) link name */
136 GNULONGNAME = 'L', /* GNU long (>100 chars) file name */
137};
138typedef enum TarFileType TarFileType;
139
140/* Might be faster (and bigger) if the dev/ino were stored in numeric order;) */
141static void
142addHardLinkInfo (HardLinkInfo **hlInfoHeadPtr, dev_t dev, ino_t ino,
143 short linkCount, const char *name)
144{
145 /* Note: hlInfoHeadPtr can never be NULL! */
146 HardLinkInfo *hlInfo;
147
148 hlInfo = (HardLinkInfo *)xmalloc(sizeof(HardLinkInfo)+strlen(name)+1);
149 if (hlInfo) {
150 hlInfo->next = *hlInfoHeadPtr;
151 *hlInfoHeadPtr = hlInfo;
152 hlInfo->dev = dev;
153 hlInfo->ino = ino;
154 hlInfo->linkCount = linkCount;
155 strcpy(hlInfo->name, name);
156 }
157 return;
158}
159
160static void
161freeHardLinkInfo (HardLinkInfo **hlInfoHeadPtr)
162{
163 HardLinkInfo *hlInfo = NULL;
164 HardLinkInfo *hlInfoNext = NULL;
165
166 if (hlInfoHeadPtr) {
167 hlInfo = *hlInfoHeadPtr;
168 while (hlInfo) {
169 hlInfoNext = hlInfo->next;
170 free(hlInfo);
171 hlInfo = hlInfoNext;
172 }
173 *hlInfoHeadPtr = NULL;
174 }
175 return;
176}
177
178/* Might be faster (and bigger) if the dev/ino were stored in numeric order;) */
179static HardLinkInfo *
180findHardLinkInfo (HardLinkInfo *hlInfo, dev_t dev, ino_t ino)
181{
182 while(hlInfo) {
183 if ((ino == hlInfo->ino) && (dev == hlInfo->dev))
184 break;
185 hlInfo = hlInfo->next;
186 }
187 return(hlInfo);
188}
189
190/* Put an octal string into the specified buffer.
191 * The number is zero and space padded and possibly null padded.
192 * Returns TRUE if successful. */
193static int putOctal (char *cp, int len, long value)
194{
195 int tempLength;
196 char tempBuffer[32];
197 char *tempString = tempBuffer;
198
199 /* Create a string of the specified length with an initial space,
200 * leading zeroes and the octal number, and a trailing null. */
201 sprintf (tempString, "%0*lo", len - 1, value);
202
203 /* If the string is too large, suppress the leading space. */
204 tempLength = strlen (tempString) + 1;
205 if (tempLength > len) {
206 tempLength--;
207 tempString++;
208 }
209
210 /* If the string is still too large, suppress the trailing null. */
211 if (tempLength > len)
212 tempLength--;
213
214 /* If the string is still too large, fail. */
215 if (tempLength > len)
216 return FALSE;
217
218 /* Copy the string to the field. */
219 memcpy (cp, tempString, len);
220
221 return TRUE;
222}
223
224/* Write out a tar header for the specified file/directory/whatever */
225static int
226writeTarHeader(struct TarBallInfo *tbInfo, const char *header_name,
227 const char *real_name, struct stat *statbuf)
228{
229 long chksum=0;
230 struct TarHeader header;
231 const unsigned char *cp = (const unsigned char *) &header;
232 ssize_t size = sizeof(struct TarHeader);
233
234 memset( &header, 0, size);
235
236 strncpy(header.name, header_name, sizeof(header.name));
237
238 putOctal(header.mode, sizeof(header.mode), statbuf->st_mode);
239 putOctal(header.uid, sizeof(header.uid), statbuf->st_uid);
240 putOctal(header.gid, sizeof(header.gid), statbuf->st_gid);
241 putOctal(header.size, sizeof(header.size), 0); /* Regular file size is handled later */
242 putOctal(header.mtime, sizeof(header.mtime), statbuf->st_mtime);
243 strncpy(header.magic, TAR_MAGIC TAR_VERSION,
244 TAR_MAGIC_LEN + TAR_VERSION_LEN );
245
246 /* Enter the user and group names (default to root if it fails) */
247 my_getpwuid(header.uname, statbuf->st_uid);
248 if (! *header.uname)
249 strcpy(header.uname, "root");
250 my_getgrgid(header.gname, statbuf->st_gid);
251 if (! *header.uname)
252 strcpy(header.uname, "root");
253
254 if (tbInfo->hlInfo) {
255 /* This is a hard link */
256 header.typeflag = LNKTYPE;
257 strncpy(header.linkname, tbInfo->hlInfo->name, sizeof(header.linkname));
258 } else if (S_ISLNK(statbuf->st_mode)) {
259 char *lpath = xreadlink(real_name);
260 if (!lpath) /* Already printed err msg inside xreadlink() */
261 return ( FALSE);
262 header.typeflag = SYMTYPE;
263 strncpy(header.linkname, lpath, sizeof(header.linkname));
264 free(lpath);
265 } else if (S_ISDIR(statbuf->st_mode)) {
266 header.typeflag = DIRTYPE;
267 strncat(header.name, "/", sizeof(header.name));
268 } else if (S_ISCHR(statbuf->st_mode)) {
269 header.typeflag = CHRTYPE;
270 putOctal(header.devmajor, sizeof(header.devmajor), MAJOR(statbuf->st_rdev));
271 putOctal(header.devminor, sizeof(header.devminor), MINOR(statbuf->st_rdev));
272 } else if (S_ISBLK(statbuf->st_mode)) {
273 header.typeflag = BLKTYPE;
274 putOctal(header.devmajor, sizeof(header.devmajor), MAJOR(statbuf->st_rdev));
275 putOctal(header.devminor, sizeof(header.devminor), MINOR(statbuf->st_rdev));
276 } else if (S_ISFIFO(statbuf->st_mode)) {
277 header.typeflag = FIFOTYPE;
278 } else if (S_ISREG(statbuf->st_mode)) {
279 header.typeflag = REGTYPE;
280 putOctal(header.size, sizeof(header.size), statbuf->st_size);
281 } else {
282 error_msg("%s: Unknown file type", real_name);
283 return ( FALSE);
284 }
285
286 /* Calculate and store the checksum (i.e., the sum of all of the bytes of
287 * the header). The checksum field must be filled with blanks for the
288 * calculation. The checksum field is formatted differently from the
289 * other fields: it has [6] digits, a null, then a space -- rather than
290 * digits, followed by a null like the other fields... */
291 memset(header.chksum, ' ', sizeof(header.chksum));
292 cp = (const unsigned char *) &header;
293 while (size-- > 0)
294 chksum += *cp++;
295 putOctal(header.chksum, 7, chksum);
296
297 /* Now write the header out to disk */
298 if ((size=full_write(tbInfo->tarFd, (char*)&header, sizeof(struct TarHeader))) < 0) {
299 error_msg(io_error, real_name, strerror(errno));
300 return ( FALSE);
301 }
302 /* Pad the header up to the tar block size */
303 for (; size<TAR_BLOCK_SIZE; size++) {
304 write(tbInfo->tarFd, "\0", 1);
305 }
306 /* Now do the verbose thing (or not) */
307 if (tbInfo->verboseFlag==TRUE) {
308 FILE *vbFd = stdout;
309 if (tbInfo->tarFd == fileno(stdout)) // If the archive goes to stdout, verbose to stderr
310 vbFd = stderr;
311 fprintf(vbFd, "%s\n", header.name);
312 }
313
314 return ( TRUE);
315}
316
317static int exclude_file(char **excluded_files, const char *file)
318{
319 int i;
320
321 if (excluded_files == NULL)
322 return 0;
323
324 for (i = 0; excluded_files[i] != NULL; i++) {
325 if (excluded_files[i][0] == '/') {
326 if (fnmatch(excluded_files[i], file,
327 FNM_PATHNAME | FNM_LEADING_DIR) == 0)
328 return 1;
329 } else {
330 const char *p;
331
332 for (p = file; p[0] != '\0'; p++) {
333 if ((p == file || p[-1] == '/') && p[0] != '/' &&
334 fnmatch(excluded_files[i], p,
335 FNM_PATHNAME | FNM_LEADING_DIR) == 0)
336 return 1;
337 }
338 }
339 }
340
341 return 0;
342}
343
344static int writeFileToTarball(const char *fileName, struct stat *statbuf, void* userData)
345{
346 struct TarBallInfo *tbInfo = (struct TarBallInfo *)userData;
347 const char *header_name;
348
349 /*
350 ** Check to see if we are dealing with a hard link.
351 ** If so -
352 ** Treat the first occurance of a given dev/inode as a file while
353 ** treating any additional occurances as hard links. This is done
354 ** by adding the file information to the HardLinkInfo linked list.
355 */
356 tbInfo->hlInfo = NULL;
357 if (statbuf->st_nlink > 1) {
358 tbInfo->hlInfo = findHardLinkInfo(tbInfo->hlInfoHead, statbuf->st_dev,
359 statbuf->st_ino);
360 if (tbInfo->hlInfo == NULL)
361 addHardLinkInfo (&tbInfo->hlInfoHead, statbuf->st_dev,
362 statbuf->st_ino, statbuf->st_nlink, fileName);
363 }
364
365 /* It is against the rules to archive a socket */
366 if (S_ISSOCK(statbuf->st_mode)) {
367 error_msg("%s: socket ignored", fileName);
368 return( TRUE);
369 }
370
371 /* It is a bad idea to store the archive we are in the process of creating,
372 * so check the device and inode to be sure that this particular file isn't
373 * the new tarball */
374 if (tbInfo->statBuf.st_dev == statbuf->st_dev &&
375 tbInfo->statBuf.st_ino == statbuf->st_ino) {
376 error_msg("%s: file is the archive; skipping", fileName);
377 return( TRUE);
378 }
379
380 header_name = fileName;
381 while (header_name[0] == '/') {
382 static int alreadyWarned=FALSE;
383 if (alreadyWarned==FALSE) {
384 error_msg("Removing leading '/' from member names");
385 alreadyWarned=TRUE;
386 }
387 header_name++;
388 }
389
390 if (strlen(fileName) >= NAME_SIZE) {
391 error_msg(name_longer_than_foo, NAME_SIZE);
392 return ( TRUE);
393 }
394
395 if (header_name[0] == '\0')
396 return TRUE;
397
398# if defined BB_FEATURE_TAR_EXCLUDE
399 if (exclude_file(tbInfo->excludeList, header_name)) {
400 return SKIP;
401 }
402# endif //BB_FEATURE_TAR_EXCLUDE
403
404 if (writeTarHeader(tbInfo, header_name, fileName, statbuf)==FALSE) {
405 return( FALSE);
406 }
407
408 /* Now, if the file is a regular file, copy it out to the tarball */
409 if ((tbInfo->hlInfo == NULL)
410 && (S_ISREG(statbuf->st_mode))) {
411 int inputFileFd;
412 char buffer[BUFSIZ];
413 ssize_t size=0, readSize=0;
414
415 /* open the file we want to archive, and make sure all is well */
416 if ((inputFileFd = open(fileName, O_RDONLY)) < 0) {
417 error_msg("%s: Cannot open: %s", fileName, strerror(errno));
418 return( FALSE);
419 }
420
421 /* write the file to the archive */
422 while ( (size = full_read(inputFileFd, buffer, sizeof(buffer))) > 0 ) {
423 if (full_write(tbInfo->tarFd, buffer, size) != size ) {
424 /* Output file seems to have a problem */
425 error_msg(io_error, fileName, strerror(errno));
426 return( FALSE);
427 }
428 readSize+=size;
429 }
430 if (size == -1) {
431 error_msg(io_error, fileName, strerror(errno));
432 return( FALSE);
433 }
434 /* Pad the file up to the tar block size */
435 for (; (readSize%TAR_BLOCK_SIZE) != 0; readSize++) {
436 write(tbInfo->tarFd, "\0", 1);
437 }
438 close( inputFileFd);
439 }
440
441 return( TRUE);
442}
443
444static int writeTarFile(const char* tarName, int verboseFlag, char **argv,
445 char** excludeList)
446{
447 int tarFd=-1;
448 int errorFlag=FALSE;
449 ssize_t size;
450 struct TarBallInfo tbInfo;
451 tbInfo.verboseFlag = verboseFlag;
452 tbInfo.hlInfoHead = NULL;
453
454 /* Make sure there is at least one file to tar up. */
455 if (*argv == NULL)
456 error_msg_and_die("Cowardly refusing to create an empty archive");
457
458 /* Open the tar file for writing. */
459 if (!strcmp(tarName, "-"))
460 tbInfo.tarFd = fileno(stdout);
461 else
462 tbInfo.tarFd = open (tarName, O_WRONLY | O_CREAT | O_TRUNC, 0644);
463 if (tbInfo.tarFd < 0) {
464 perror_msg( "Error opening '%s'", tarName);
465 freeHardLinkInfo(&tbInfo.hlInfoHead);
466 return ( FALSE);
467 }
468 tbInfo.excludeList=excludeList;
469 /* Store the stat info for the tarball's file, so
470 * can avoid including the tarball into itself.... */
471 if (fstat(tbInfo.tarFd, &tbInfo.statBuf) < 0)
472 error_msg_and_die(io_error, tarName, strerror(errno));
473
474 /* Read the directory/files and iterate over them one at a time */
475 while (*argv != NULL) {
476 if (recursive_action(*argv++, TRUE, FALSE, FALSE,
477 writeFileToTarball, writeFileToTarball,
478 (void*) &tbInfo) == FALSE) {
479 errorFlag = TRUE;
480 }
481 }
482 /* Write two empty blocks to the end of the archive */
483 for (size=0; size<(2*TAR_BLOCK_SIZE); size++) {
484 write(tbInfo.tarFd, "\0", 1);
485 }
486
487 /* To be pedantically correct, we would check if the tarball
488 * is smaller than 20 tar blocks, and pad it if it was smaller,
489 * but that isn't necessary for GNU tar interoperability, and
490 * so is considered a waste of space */
491
492 /* Hang up the tools, close up shop, head home */
493 close(tarFd);
494 if (errorFlag == TRUE) {
495 error_msg("Error exit delayed from previous errors");
496 freeHardLinkInfo(&tbInfo.hlInfoHead);
497 return(FALSE);
498 }
499 freeHardLinkInfo(&tbInfo.hlInfoHead);
500 return( TRUE);
501}
502#endif //tar_create
503
504void append_file_to_list(const char *new_name, char ***list, int *list_count)
505{
506 *list = realloc(*list, sizeof(char *) * (*list_count + 2));
507 (*list)[*list_count] = xstrdup(new_name);
508 (*list_count)++;
509 (*list)[*list_count] = NULL;
510}
511
512void append_file_list_to_list(char *filename, char ***name_list, int *num_of_entries)
513{
514 FILE *src_stream;
515 char *line;
516 char *line_ptr;
517
518 src_stream = xfopen(filename, "r");
519 while ((line = get_line_from_file(src_stream)) != NULL) {
520 line_ptr = last_char_is(line, '\n');
521 if (line_ptr) {
522 *line_ptr = '\0';
523 }
524 append_file_to_list(line, name_list, num_of_entries);
525 free(line);
526 }
527 fclose(src_stream);
528}
529
530#ifdef BB_FEATURE_TAR_EXCLUDE
531/*
532 * Create a list of names that are in the include list AND NOT in the exclude lists
533 */
534char **list_and_not_list(char **include_list, char **exclude_list)
535{
536 char **new_include_list = NULL;
537 int new_include_count = 0;
538 int include_count = 0;
539 int exclude_count;
540
541 if (include_list == NULL) {
542 return(NULL);
543 }
544
545 while (include_list[include_count] != NULL) {
546 int found = FALSE;
547 exclude_count = 0;
548 while (exclude_list[exclude_count] != NULL) {
549 if (strcmp(include_list[include_count], exclude_list[exclude_count]) == 0) {
550 found = TRUE;
551 break;
552 }
553 exclude_count++;
554 }
555
556 if (found == FALSE) {
557 new_include_list = realloc(new_include_list, sizeof(char *) * (include_count + 2));
558 new_include_list[new_include_count] = include_list[include_count];
559 new_include_count++;
560 } else {
561 free(include_list[include_count]);
562 }
563 include_count++;
564 }
565 new_include_list[new_include_count] = NULL;
566 return(new_include_list);
567}
568#endif
569
570int tar_main(int argc, char **argv)
571{
572 enum untar_funct_e {
573 /* These are optional */
574 untar_from_file = 1,
575 untar_from_stdin = 2,
576 untar_unzip = 4,
577 /* Require one and only one of these */
578 untar_list = 8,
579 untar_create = 16,
580 untar_extract = 32
581 };
582
583 FILE *src_stream = NULL;
584 FILE *uncompressed_stream = NULL;
585 char **include_list = NULL;
586 char **exclude_list = NULL;
587 char *src_filename = NULL;
588 char *dst_prefix = NULL;
589 char *file_list_name = NULL;
590 int opt;
591 unsigned short untar_funct = 0;
592 unsigned short untar_funct_required = 0;
593 unsigned short extract_function = 0;
594 int include_list_count = 0;
595 int exclude_list_count = 0;
596 int gunzip_pid;
597 int gz_fd = 0;
598
599 if (argc < 2) {
600 show_usage();
601 }
602
603 /* Prepend '-' to the first argument if required */
604 if (argv[1][0] != '-') {
605 char *tmp = xmalloc(strlen(argv[1]) + 2);
606 tmp[0] = '-';
607 strcpy(tmp + 1, argv[1]);
608 argv[1] = tmp;
609 }
610
611 while ((opt = getopt(argc, argv, "ctxT:X:C:f:Opvz")) != -1) {
612 switch (opt) {
613
614 /* One and only one of these is required */
615 case 'c':
616 untar_funct_required |= untar_create;
617 break;
618 case 't':
619 untar_funct_required |= untar_list;
620 extract_function |= extract_list |extract_unconditional;
621 break;
622 case 'x':
623 untar_funct_required |= untar_extract;
624 extract_function |= (extract_all_to_fs | extract_unconditional | extract_create_leading_dirs);
625 break;
626
627 /* These are optional */
628 /* Exclude or Include files listed in <filename>*/
629#ifdef BB_FEATURE_TAR_EXCLUDE
630 case 'X':
631 append_file_list_to_list(optarg, &exclude_list, &exclude_list_count);
632 break;
633#endif
634 case 'T':
635 // by default a list is an include list
636 append_file_list_to_list(optarg, &include_list, &include_list_count);
637 break;
638
639 case 'C': // Change to dir <optarg>
640 /* Make sure dst_prefix ends in a '/' */
641 dst_prefix = concat_path_file(optarg, "/");
642 break;
643 case 'f': // archive filename
644 if (strcmp(optarg, "-") == 0) {
645 // Untar from stdin to stdout
646 untar_funct |= untar_from_stdin;
647 } else {
648 untar_funct |= untar_from_file;
649 src_filename = xstrdup(optarg);
650 }
651 break;
652 case 'O':
653 extract_function |= extract_to_stdout;
654 break;
655 case 'p':
656 break;
657 case 'v':
658 if (extract_function & extract_list) {
659 extract_function |= extract_verbose_list;
660 }
661 extract_function |= extract_list;
662 break;
663#ifdef BB_FEATURE_TAR_GZIP
664 case 'z':
665 untar_funct |= untar_unzip;
666 break;
667#endif
668 default:
669 show_usage();
670 }
671 }
672
673 /* Make sure the valid arguments were passed */
674 if (untar_funct_required == 0) {
675 error_msg_and_die("You must specify one of the `-ctx' options");
676 }
677 if ((untar_funct_required != untar_create) &&
678 (untar_funct_required != untar_extract) &&
679 (untar_funct_required != untar_list)) {
680 error_msg_and_die("You may not specify more than one `ctx' option.");
681 }
682 untar_funct |= untar_funct_required;
683
684 /* Setup an array of filenames to work with */
685 while (optind < argc) {
686 append_file_to_list(argv[optind], &include_list, &include_list_count);
687 optind++;
688 }
689
690 if (extract_function & (extract_list | extract_all_to_fs)) {
691 if (dst_prefix == NULL) {
692 dst_prefix = xstrdup("./");
693 }
694
695 /* Setup the source of the tar data */
696 if (untar_funct & untar_from_file) {
697 src_stream = xfopen(src_filename, "r");
698 } else {
699 src_stream = stdin;
700 }
701#ifdef BB_FEATURE_TAR_GZIP
702 /* Get a binary tree of all the tar file headers */
703 if (untar_funct & untar_unzip) {
704 uncompressed_stream = gz_open(src_stream, &gunzip_pid);
705 } else
706#endif // BB_FEATURE_TAR_GZIP
707 uncompressed_stream = src_stream;
708
709 /* extract or list archive */
710 unarchive(uncompressed_stream, stdout, &get_header_tar, extract_function, dst_prefix, include_list, exclude_list);
711 fclose(uncompressed_stream);
712 }
713#ifdef BB_FEATURE_TAR_CREATE
714 /* create an archive */
715 else if (untar_funct & untar_create) {
716 int verboseFlag = FALSE;
717
718#ifdef BB_FEATURE_TAR_GZIP
719 if (untar_funct && untar_unzip) {
720 error_msg_and_die("Creation of compressed tarfile not internally support by tar, pipe to busybox gunzip");
721 }
722#endif // BB_FEATURE_TAR_GZIP
723 if (extract_function & extract_verbose_list) {
724 verboseFlag = TRUE;
725 }
726 writeTarFile(src_filename, verboseFlag, &argv[argc - 1], include_list);
727 }
728#endif // BB_FEATURE_TAR_CREATE
729
730 /* Cleanups */
731#ifdef BB_FEATURE_TAR_GZIP
732 if (untar_funct & untar_unzip) {
733 fclose(src_stream);
734 close(gz_fd);
735 gz_close(gunzip_pid);
736 }
737#endif // BB_FEATURE_TAR_GZIP
738 if (src_filename) {
739 free(src_filename);
740 }
741 if (file_list_name) {
742 free(file_list_name);
743 }
744 return(EXIT_SUCCESS);
745}
generated by cgit v1.2.3-55-g6feb (git 2.39.1) at 2025-03-23 21:22:37 +0000