aboutsummaryrefslogtreecommitdiff
path: root/archival/tar.c
blob: 1899ab9542c5de23e2c0af93709c15180d15a188 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
/* vi: set sw=4 ts=4: */
/*
 * Mini tar implementation for busybox 
 *
 * Modifed to use common extraction code used by ar, cpio, dpkg-deb, dpkg
 *  Glenn McGrath <bug1@optushome.com.au>
 *
 * Note, that as of BusyBox-0.43, tar has been completely rewritten from the
 * ground up.  It still has remnents of the old code lying about, but it is
 * very different now (i.e., cleaner, less global variables, etc.)
 *
 * Copyright (C) 1999,2000 by Lineo, inc. and Erik Andersen
 * Copyright (C) 1999-2002 by Erik Andersen <andersee@debian.org>
 *
 * Based in part in the tar implementation in sash
 *  Copyright (c) 1999 by David I. Bell
 *  Permission is granted to use, distribute, or modify this source,
 *  provided that this copyright notice remains intact.
 *  Permission to distribute sash derived code under the GPL has been granted.
 *
 * Based in part on the tar implementation from busybox-0.28
 *  Copyright (C) 1995 Bruce Perens
 *  This is free software under the GNU General Public License.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 *
 */

#include <fcntl.h>
#include <getopt.h>
#include <search.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fnmatch.h>
#include <string.h>
#include <errno.h>
#include <signal.h>
#include <sys/wait.h>
#include <sys/socket.h>
#include "unarchive.h"
#include "busybox.h"

#ifdef CONFIG_FEATURE_TAR_CREATE

/* Tar file constants  */
# define TAR_MAGIC          "ustar"	/* ustar and a null */
# define TAR_VERSION        "  "	/* Be compatable with GNU tar format */

# ifndef MAJOR
#  define MAJOR(dev) (((dev)>>8)&0xff)
#  define MINOR(dev) ((dev)&0xff)
# endif

static const int TAR_BLOCK_SIZE = 512;
static const int TAR_MAGIC_LEN = 6;
static const int TAR_VERSION_LEN = 2;

/* POSIX tar Header Block, from POSIX 1003.1-1990  */
enum { NAME_SIZE = 100 };	/* because gcc won't let me use 'static const int' */
struct TarHeader {		/* byte offset */
	char name[NAME_SIZE];	/*   0-99 */
	char mode[8];		/* 100-107 */
	char uid[8];		/* 108-115 */
	char gid[8];		/* 116-123 */
	char size[12];		/* 124-135 */
	char mtime[12];		/* 136-147 */
	char chksum[8];		/* 148-155 */
	char typeflag;		/* 156-156 */
	char linkname[NAME_SIZE];	/* 157-256 */
	char magic[6];		/* 257-262 */
	char version[2];	/* 263-264 */
	char uname[32];		/* 265-296 */
	char gname[32];		/* 297-328 */
	char devmajor[8];	/* 329-336 */
	char devminor[8];	/* 337-344 */
	char prefix[155];	/* 345-499 */
	char padding[12];	/* 500-512 (pad to exactly the TAR_BLOCK_SIZE) */
};
typedef struct TarHeader TarHeader;

/*
** writeTarFile(),  writeFileToTarball(), and writeTarHeader() are
** the only functions that deal with the HardLinkInfo structure.
** Even these functions use the xxxHardLinkInfo() functions.
*/
typedef struct HardLinkInfo HardLinkInfo;
struct HardLinkInfo {
	HardLinkInfo *next;	/* Next entry in list */
	dev_t dev;			/* Device number */
	ino_t ino;			/* Inode number */
	short linkCount;	/* (Hard) Link Count */
	char name[1];		/* Start of filename (must be last) */
};

/* Some info to be carried along when creating a new tarball */
struct TarBallInfo {
	char *fileName;		/* File name of the tarball */
	int tarFd;			/* Open-for-write file descriptor
						   for the tarball */
	struct stat statBuf;	/* Stat info for the tarball, letting
							   us know the inode and device that the
							   tarball lives, so we can avoid trying 
							   to include the tarball into itself */
	int verboseFlag;	/* Whether to print extra stuff or not */
	const llist_t *excludeList;	/* List of files to not include */
	HardLinkInfo *hlInfoHead;	/* Hard Link Tracking Information */
	HardLinkInfo *hlInfo;	/* Hard Link Info for the current file */
};
typedef struct TarBallInfo TarBallInfo;

/* A nice enum with all the possible tar file content types */
enum TarFileType {
	REGTYPE = '0',		/* regular file */
	REGTYPE0 = '\0',	/* regular file (ancient bug compat) */
	LNKTYPE = '1',		/* hard link */
	SYMTYPE = '2',		/* symbolic link */
	CHRTYPE = '3',		/* character special */
	BLKTYPE = '4',		/* block special */
	DIRTYPE = '5',		/* directory */
	FIFOTYPE = '6',		/* FIFO special */
	CONTTYPE = '7',		/* reserved */
	GNULONGLINK = 'K',	/* GNU long (>100 chars) link name */
	GNULONGNAME = 'L',	/* GNU long (>100 chars) file name */
};
typedef enum TarFileType TarFileType;

/* Might be faster (and bigger) if the dev/ino were stored in numeric order;) */
static inline void addHardLinkInfo(HardLinkInfo ** hlInfoHeadPtr,
					struct stat *statbuf,
					const char *name)
{
	/* Note: hlInfoHeadPtr can never be NULL! */
	HardLinkInfo *hlInfo;

	hlInfo = (HardLinkInfo *) xmalloc(sizeof(HardLinkInfo) + strlen(name));
	hlInfo->next = *hlInfoHeadPtr;
	*hlInfoHeadPtr = hlInfo;
	hlInfo->dev = statbuf->st_dev;
	hlInfo->ino = statbuf->st_ino;
	hlInfo->linkCount = statbuf->st_nlink;
	strcpy(hlInfo->name, name);
}

static void freeHardLinkInfo(HardLinkInfo ** hlInfoHeadPtr)
{
	HardLinkInfo *hlInfo = NULL;
	HardLinkInfo *hlInfoNext = NULL;

	if (hlInfoHeadPtr) {
		hlInfo = *hlInfoHeadPtr;
		while (hlInfo) {
			hlInfoNext = hlInfo->next;
			free(hlInfo);
			hlInfo = hlInfoNext;
		}
		*hlInfoHeadPtr = NULL;
	}
	return;
}

/* Might be faster (and bigger) if the dev/ino were stored in numeric order;) */
static inline HardLinkInfo *findHardLinkInfo(HardLinkInfo * hlInfo, struct stat *statbuf)
{
	while (hlInfo) {
		if ((statbuf->st_ino == hlInfo->ino) && (statbuf->st_dev == hlInfo->dev))
			break;
		hlInfo = hlInfo->next;
	}
	return (hlInfo);
}

/* Put an octal string into the specified buffer.
 * The number is zero and space padded and possibly null padded.
 * Returns TRUE if successful.  */
static int putOctal(char *cp, int len, long value)
{
	int tempLength;
	char tempBuffer[32];
	char *tempString = tempBuffer;

	/* Create a string of the specified length with an initial space,
	 * leading zeroes and the octal number, and a trailing null.  */
	sprintf(tempString, "%0*lo", len - 1, value);

	/* If the string is too large, suppress the leading space.  */
	tempLength = strlen(tempString) + 1;
	if (tempLength > len) {
		tempLength--;
		tempString++;
	}

	/* If the string is still too large, suppress the trailing null.  */
	if (tempLength > len)
		tempLength--;

	/* If the string is still too large, fail.  */
	if (tempLength > len)
		return FALSE;

	/* Copy the string to the field.  */
	memcpy(cp, tempString, len);

	return TRUE;
}

/* Write out a tar header for the specified file/directory/whatever */
static inline int writeTarHeader(struct TarBallInfo *tbInfo,
								 const char *header_name,
								 const char *real_name, struct stat *statbuf)
{
	long chksum = 0;
	struct TarHeader header;
	const unsigned char *cp = (const unsigned char *) &header;
	ssize_t size = sizeof(struct TarHeader);

	memset(&header, 0, size);

	strncpy(header.name, header_name, sizeof(header.name));

	putOctal(header.mode, sizeof(header.mode), statbuf->st_mode);
	putOctal(header.uid, sizeof(header.uid), statbuf->st_uid);
	putOctal(header.gid, sizeof(header.gid), statbuf->st_gid);
	putOctal(header.size, sizeof(header.size), 0);	/* Regular file size is handled later */
	putOctal(header.mtime, sizeof(header.mtime), statbuf->st_mtime);
	strncpy(header.magic, TAR_MAGIC TAR_VERSION,
			TAR_MAGIC_LEN + TAR_VERSION_LEN);

	/* Enter the user and group names (default to root if it fails) */
	if (my_getpwuid(header.uname, statbuf->st_uid) == NULL)
		strcpy(header.uname, "root");
	if (my_getgrgid(header.gname, statbuf->st_gid) == NULL)
		strcpy(header.gname, "root");

	if (tbInfo->hlInfo) {
		/* This is a hard link */
		header.typeflag = LNKTYPE;
		strncpy(header.linkname, tbInfo->hlInfo->name,
				sizeof(header.linkname));
	} else if (S_ISLNK(statbuf->st_mode)) {
		char *lpath = xreadlink(real_name);

		if (!lpath)		/* Already printed err msg inside xreadlink() */
			return (FALSE);
		header.typeflag = SYMTYPE;
		strncpy(header.linkname, lpath, sizeof(header.linkname));
		free(lpath);
	} else if (S_ISDIR(statbuf->st_mode)) {
		header.typeflag = DIRTYPE;
		strncat(header.name, "/", sizeof(header.name));
	} else if (S_ISCHR(statbuf->st_mode)) {
		header.typeflag = CHRTYPE;
		putOctal(header.devmajor, sizeof(header.devmajor),
				 MAJOR(statbuf->st_rdev));
		putOctal(header.devminor, sizeof(header.devminor),
				 MINOR(statbuf->st_rdev));
	} else if (S_ISBLK(statbuf->st_mode)) {
		header.typeflag = BLKTYPE;
		putOctal(header.devmajor, sizeof(header.devmajor),
				 MAJOR(statbuf->st_rdev));
		putOctal(header.devminor, sizeof(header.devminor),
				 MINOR(statbuf->st_rdev));
	} else if (S_ISFIFO(statbuf->st_mode)) {
		header.typeflag = FIFOTYPE;
	} else if (S_ISREG(statbuf->st_mode)) {
		header.typeflag = REGTYPE;
		putOctal(header.size, sizeof(header.size), statbuf->st_size);
	} else {
		error_msg("%s: Unknown file type", real_name);
		return (FALSE);
	}

	/* Calculate and store the checksum (i.e., the sum of all of the bytes of
	 * the header).  The checksum field must be filled with blanks for the
	 * calculation.  The checksum field is formatted differently from the
	 * other fields: it has [6] digits, a null, then a space -- rather than
	 * digits, followed by a null like the other fields... */
	memset(header.chksum, ' ', sizeof(header.chksum));
	cp = (const unsigned char *) &header;
	while (size-- > 0)
		chksum += *cp++;
	putOctal(header.chksum, 7, chksum);

	/* Now write the header out to disk */
	if ((size =
		 full_write(tbInfo->tarFd, (char *) &header,
					sizeof(struct TarHeader))) < 0) {
		error_msg(io_error, real_name);
		return (FALSE);
	}
	/* Pad the header up to the tar block size */
	for (; size < TAR_BLOCK_SIZE; size++) {
		write(tbInfo->tarFd, "\0", 1);
	}
	/* Now do the verbose thing (or not) */

	if (tbInfo->verboseFlag) {
		FILE *vbFd = stdout;

		if (tbInfo->verboseFlag == 2)	/* If the archive goes to stdout, verbose to stderr */
			vbFd = stderr;
		fprintf(vbFd, "%s\n", header.name);
	}

	return (TRUE);
}

# if defined CONFIG_FEATURE_TAR_EXCLUDE
static inline int exclude_file(const llist_t *excluded_files, const char *file)
{
	if (excluded_files == NULL) {
		return 0;
	}

	while (excluded_files) {
		if (excluded_files->data[0] == '/') {
			if (fnmatch(excluded_files->data, file,
						FNM_PATHNAME | FNM_LEADING_DIR) == 0)
				return 1;
		} else {
			const char *p;

			for (p = file; p[0] != '\0'; p++) {
				if ((p == file || p[-1] == '/') && p[0] != '/' &&
					fnmatch(excluded_files->data, p,
							FNM_PATHNAME | FNM_LEADING_DIR) == 0)
					return 1;
			}
		}
		excluded_files = excluded_files->link;
	}

	return 0;
}
#endif

static int writeFileToTarball(const char *fileName, struct stat *statbuf,
							  void *userData)
{
	struct TarBallInfo *tbInfo = (struct TarBallInfo *) userData;
	const char *header_name;

	/*
	   ** Check to see if we are dealing with a hard link.
	   ** If so -
	   ** Treat the first occurance of a given dev/inode as a file while
	   ** treating any additional occurances as hard links.  This is done
	   ** by adding the file information to the HardLinkInfo linked list.
	 */
	tbInfo->hlInfo = NULL;
	if (statbuf->st_nlink > 1) {
		tbInfo->hlInfo = findHardLinkInfo(tbInfo->hlInfoHead, statbuf);
		if (tbInfo->hlInfo == NULL)
			addHardLinkInfo(&tbInfo->hlInfoHead, statbuf, fileName);
	}

	/* It is against the rules to archive a socket */
	if (S_ISSOCK(statbuf->st_mode)) {
		error_msg("%s: socket ignored", fileName);
		return (TRUE);
	}

	/* It is a bad idea to store the archive we are in the process of creating,
	 * so check the device and inode to be sure that this particular file isn't
	 * the new tarball */
	if (tbInfo->statBuf.st_dev == statbuf->st_dev &&
		tbInfo->statBuf.st_ino == statbuf->st_ino) {
		error_msg("%s: file is the archive; skipping", fileName);
		return (TRUE);
	}

	header_name = fileName;
	while (header_name[0] == '/') {
		static int alreadyWarned = FALSE;

		if (alreadyWarned == FALSE) {
			error_msg("Removing leading '/' from member names");
			alreadyWarned = TRUE;
		}
		header_name++;
	}

	if (strlen(fileName) >= NAME_SIZE) {
		error_msg(name_longer_than_foo, NAME_SIZE);
		return (TRUE);
	}

	if (header_name[0] == '\0')
		return TRUE;

# if defined CONFIG_FEATURE_TAR_EXCLUDE
	if (exclude_file(tbInfo->excludeList, header_name)) {
		return SKIP;
	}
# endif							/* CONFIG_FEATURE_TAR_EXCLUDE */

	if (writeTarHeader(tbInfo, header_name, fileName, statbuf) == FALSE) {
		return (FALSE);
	}

	/* Now, if the file is a regular file, copy it out to the tarball */
	if ((tbInfo->hlInfo == NULL)
		&& (S_ISREG(statbuf->st_mode))) {
		int inputFileFd;
		char buffer[BUFSIZ];
		ssize_t size = 0, readSize = 0;

		/* open the file we want to archive, and make sure all is well */
		if ((inputFileFd = open(fileName, O_RDONLY)) < 0) {
			perror_msg("%s: Cannot open", fileName);
			return (FALSE);
		}

		/* write the file to the archive */
		while ((size = full_read(inputFileFd, buffer, sizeof(buffer))) > 0) {
			if (full_write(tbInfo->tarFd, buffer, size) != size) {
				/* Output file seems to have a problem */
				error_msg(io_error, fileName);
				return (FALSE);
			}
			readSize += size;
		}
		if (size == -1) {
			error_msg(io_error, fileName);
			return (FALSE);
		}
		/* Pad the file up to the tar block size */
		for (; (readSize % TAR_BLOCK_SIZE) != 0; readSize++) {
			write(tbInfo->tarFd, "\0", 1);
		}
		close(inputFileFd);
	}

	return (TRUE);
}

static inline int writeTarFile(const char *tarName, const int verboseFlag,
							   const llist_t *include, const llist_t *exclude, const int gzip)
{
#ifdef CONFIG_FEATURE_TAR_GZIP
	int gzipDataPipe[2] = { -1, -1 };
	int gzipStatusPipe[2] = { -1, -1 };
	pid_t gzipPid = 0;
	volatile int vfork_exec_errno = 0;
#endif

	int errorFlag = FALSE;
	ssize_t size;
	struct TarBallInfo tbInfo;

	tbInfo.hlInfoHead = NULL;

	/* Make sure there is at least one file to tar up.  */
	if (include == NULL) {
		error_msg_and_die("Cowardly refusing to create an empty archive");
	}

	/* Open the tar file for writing.  */
	if (tarName == NULL || (tarName[0] == '-' && tarName[1] == '\0')) {
		tbInfo.tarFd = fileno(stdout);
		tbInfo.verboseFlag = verboseFlag ? 2 : 0;
	} else {
		tbInfo.tarFd = open(tarName, O_WRONLY | O_CREAT | O_TRUNC, 0644);
		tbInfo.verboseFlag = verboseFlag ? 1 : 0;
	}

	if (tbInfo.tarFd < 0) {
		perror_msg("%s: Cannot open", tarName);
		freeHardLinkInfo(&tbInfo.hlInfoHead);
		return (FALSE);
	}

	/* Store the stat info for the tarball's file, so
	 * can avoid including the tarball into itself....  */
	if (fstat(tbInfo.tarFd, &tbInfo.statBuf) < 0)
		error_msg_and_die(io_error, tarName);

#ifdef CONFIG_FEATURE_TAR_GZIP
	if (gzip) {
		if (pipe(gzipDataPipe) < 0 || pipe(gzipStatusPipe) < 0) {
			perror_msg_and_die("Failed to create gzip pipe");
		}

		signal(SIGPIPE, SIG_IGN);	/* we only want EPIPE on errors */

# if __GNUC__
			/* Avoid vfork clobbering */
			(void) &include;
			(void) &errorFlag;
# endif
 
		gzipPid = vfork();

		if (gzipPid == 0) {
			dup2(gzipDataPipe[0], 0);
			close(gzipDataPipe[1]);

			if (tbInfo.tarFd != 1);
			dup2(tbInfo.tarFd, 1);

			close(gzipStatusPipe[0]);
			fcntl(gzipStatusPipe[1], F_SETFD, FD_CLOEXEC);	/* close on exec shows sucess */

			execl("/bin/gzip", "gzip", "-f", 0);
			vfork_exec_errno = errno;

			close(gzipStatusPipe[1]);
			exit(-1);
		} else if (gzipPid > 0) {
			close(gzipDataPipe[0]);
			close(gzipStatusPipe[1]);

			while (1) {
				char buf;

				int n = read(gzipStatusPipe[0], &buf, 1);

				if (n == 0 && vfork_exec_errno != 0) {
					errno = vfork_exec_errno;
					perror_msg_and_die("Could not exec gzip process");
				} else if ((n < 0) && (errno == EAGAIN || errno == EINTR))
					continue;	/* try it again */
				break;
			}
			close(gzipStatusPipe[0]);

			tbInfo.tarFd = gzipDataPipe[1];
		} else {
			perror_msg_and_die("Failed to vfork gzip process");
		}
	}
#endif

	tbInfo.excludeList = exclude;

	/* Read the directory/files and iterate over them one at a time */
	while (include) {
		if (!recursive_action(include->data, TRUE, FALSE, FALSE,
							  writeFileToTarball, writeFileToTarball,
							  (void *) &tbInfo)) {
			errorFlag = TRUE;
		}
		include = include->link;
	}
	/* Write two empty blocks to the end of the archive */
	for (size = 0; size < (2 * TAR_BLOCK_SIZE); size++) {
		write(tbInfo.tarFd, "\0", 1);
	}

	/* To be pedantically correct, we would check if the tarball
	 * is smaller than 20 tar blocks, and pad it if it was smaller,
	 * but that isn't necessary for GNU tar interoperability, and
	 * so is considered a waste of space */

	/* Hang up the tools, close up shop, head home */
	close(tbInfo.tarFd);
	if (errorFlag)
		error_msg("Error exit delayed from previous errors");

	freeHardLinkInfo(&tbInfo.hlInfoHead);

#ifdef CONFIG_FEATURE_TAR_GZIP
	if (gzip && gzipPid) {
		if (waitpid(gzipPid, NULL, 0) == -1)
			printf("Couldnt wait ?");
	}
#endif

	return !errorFlag;
}
#endif							/* tar_create */

#ifdef CONFIG_FEATURE_TAR_EXCLUDE
static const llist_t *append_file_list_to_list(const char *filename, const llist_t *list)
{
	FILE *src_stream = xfopen(filename, "r");
	char *line;
	while((line = get_line_from_file(src_stream)) != NULL) {
		chomp(line);
		list = add_to_list(list, line);
	}
	fclose(src_stream);

	return (list);
}
#endif

#define CTX_CREATE	1
#define CTX_TEST	2
#define CTX_EXTRACT	4

int tar_main(int argc, char **argv)
{
	char (*get_header_ptr)(archive_handle_t *) = get_header_tar;
	archive_handle_t *tar_handle;
	int opt;
	char *base_dir = NULL;
	const char *tar_filename = "-";
	unsigned char ctx_flag = 0;

	if (argc < 2) {
		show_usage();
	}

	/* Prepend '-' to the first argument if required */
	if (argv[1][0] != '-') {
		char *tmp = xmalloc(strlen(argv[1]) + 2);
		tmp[0] = '-';
		strcpy(tmp + 1, argv[1]);
		argv[1] = tmp;
	}

	/* Initialise default values */
	tar_handle = init_handle();
	tar_handle->flags = ARCHIVE_CREATE_LEADING_DIRS;

	while ((opt = getopt(argc, argv, "cjtxT:X:C:f:Opvz")) != -1) {
		switch (opt) {
			/* One and only one of these is required */
#ifdef CONFIG_FEATURE_TAR_CREATE
		case 'c':
			ctx_flag |= CTX_CREATE;
			break;
#endif
		case 't':
			ctx_flag |= CTX_TEST;
			if ((tar_handle->action_header == header_list) || 
				(tar_handle->action_header == header_verbose_list)) {
				tar_handle->action_header = header_verbose_list;
			} else {
				tar_handle->action_header = header_list;
			}
			break;
		case 'x':
			ctx_flag |= CTX_EXTRACT;
			tar_handle->action_data = data_extract_all;
			break;

			/* These are optional */
			/* Exclude or Include files listed in <filename> */
#ifdef CONFIG_FEATURE_TAR_EXCLUDE
		case 'X':
			tar_handle->reject =
				append_file_list_to_list(optarg, tar_handle->reject);
			break;
#endif
		case 'T':
			/* by default a list is an include list */
			break;
		case 'C':		/* Change to dir <optarg> */
			base_dir = optarg;
			break;
		case 'f':		/* archive filename */
			tar_filename = optarg;
			break;
		case 'O':		/* To stdout */
			tar_handle->action_data = data_extract_to_stdout;
			break;
		case 'p':
			tar_handle->flags |= ARCHIVE_PRESERVE_DATE;
			break;
		case 'v':
			if ((tar_handle->action_header == header_list) || 
				(tar_handle->action_header == header_verbose_list)) {
				tar_handle->action_header = header_verbose_list;
			} else {
				tar_handle->action_header = header_list;
			}
			break;
#ifdef CONFIG_FEATURE_TAR_GZIP
		case 'z':
			get_header_ptr = get_header_tar_gz;
			break;
#endif
#ifdef CONFIG_FEATURE_TAR_BZIP2
		case 'j':
			get_header_ptr = get_header_tar_bz2;
			break;
#endif
		default:
			show_usage();
		}
	}

	/* Check one and only one context option was given */
	if ((ctx_flag != CTX_CREATE) && (ctx_flag != CTX_TEST) && (ctx_flag != CTX_EXTRACT)) {
		show_usage();
	}

	/* Check if we are reading from stdin */
	if ((argv[optind]) && (*argv[optind] == '-')) {
		/* Default is to read from stdin, so just skip to next arg */
		optind++;
	}

	/* Setup an array of filenames to work with */
	/* TODO: This is the same as in ar, seperate function ? */
	while (optind < argc) {
		tar_handle->accept = add_to_list(tar_handle->accept, argv[optind]);
		optind++;
	}

	if ((tar_handle->accept) || (tar_handle->reject)) {
		tar_handle->filter = filter_accept_reject_list;
	}

#ifdef CONFIG_FEATURE_TAR_CREATE
	/* create an archive */
	if (ctx_flag == CTX_CREATE) {
		int verboseFlag = FALSE;
		int gzipFlag = FALSE;

# ifdef CONFIG_FEATURE_TAR_GZIP
		if (get_header_ptr == get_header_tar_gz) {
			gzipFlag = TRUE;
		}
# endif /* CONFIG_FEATURE_TAR_GZIP */

		if (tar_handle->action_header == header_verbose_list) {
			verboseFlag = TRUE;
		}
		writeTarFile(tar_filename, verboseFlag, tar_handle->accept,
			tar_handle->reject, gzipFlag);
	} else 
#endif /* CONFIG_FEATURE_TAR_CREATE */
	{
		if ((tar_filename[0] == '-') && (tar_filename[1] == '\0')) {
			tar_handle->src_fd = fileno(stdin);
			tar_handle->seek = seek_by_char;
		} else {
			tar_handle->src_fd = xopen(tar_filename, O_RDONLY);
		}

		if ((base_dir) && (chdir(base_dir))) {
			perror_msg_and_die("Couldnt chdir");
		}

		while (get_header_ptr(tar_handle) == EXIT_SUCCESS);

		/* Ckeck that every file that should have been extracted was */
		while (tar_handle->accept) {
			if (find_list_entry(tar_handle->reject, tar_handle->accept->data) == NULL) {
				if (find_list_entry(tar_handle->passed, tar_handle->accept->data) == NULL) {
					error_msg_and_die("%s: Not found in archive\n", tar_handle->accept->data);
				}
			}
			tar_handle->accept = tar_handle->accept->link;
		}
	}

#ifdef CONFIG_FEATURE_CLEAN_UP
	if (tar_handle->src_fd != fileno(stdin)) {
		close(tar_handle->src_fd);
	}
#endif /* CONFIG_FEATURE_CLEAN_UP */

	return(EXIT_SUCCESS);
}