GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: bin/pax/ar_subs.c Lines: 158 386 40.9 %
Date: 2017-11-13 Branches: 123 390 31.5 %

Line Branch Exec Source
1
/*	$OpenBSD: ar_subs.c,v 1.48 2016/08/26 05:06:14 guenther Exp $	*/
2
/*	$NetBSD: ar_subs.c,v 1.5 1995/03/21 09:07:06 cgd Exp $	*/
3
4
/*-
5
 * Copyright (c) 1992 Keith Muller.
6
 * Copyright (c) 1992, 1993
7
 *	The Regents of the University of California.  All rights reserved.
8
 *
9
 * This code is derived from software contributed to Berkeley by
10
 * Keith Muller of the University of California, San Diego.
11
 *
12
 * Redistribution and use in source and binary forms, with or without
13
 * modification, are permitted provided that the following conditions
14
 * are met:
15
 * 1. Redistributions of source code must retain the above copyright
16
 *    notice, this list of conditions and the following disclaimer.
17
 * 2. Redistributions in binary form must reproduce the above copyright
18
 *    notice, this list of conditions and the following disclaimer in the
19
 *    documentation and/or other materials provided with the distribution.
20
 * 3. Neither the name of the University nor the names of its contributors
21
 *    may be used to endorse or promote products derived from this software
22
 *    without specific prior written permission.
23
 *
24
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34
 * SUCH DAMAGE.
35
 */
36
37
#include <sys/types.h>
38
#include <sys/stat.h>
39
#include <errno.h>
40
#include <fcntl.h>
41
#include <signal.h>
42
#include <stdio.h>
43
#include <string.h>
44
#include <time.h>
45
#include <unistd.h>
46
47
#include "pax.h"
48
#include "extern.h"
49
50
static void wr_archive(ARCHD *, int is_app);
51
static int get_arc(void);
52
static int next_head(ARCHD *);
53
extern sigset_t s_mask;
54
55
/*
56
 * Routines which control the overall operation modes of pax as specified by
57
 * the user: list, append, read ...
58
 */
59
60
static char hdbuf[BLKMULT];		/* space for archive header on read */
61
u_long flcnt;				/* number of files processed */
62
63
/*
64
 * list()
65
 *	list the contents of an archive which match user supplied pattern(s)
66
 *	(no pattern matches all).
67
 */
68
69
void
70
list(void)
71
{
72
	ARCHD *arcn;
73
	int res;
74
108
	ARCHD archd;
75
	time_t now;
76
77
	arcn = &archd;
78
	/*
79
	 * figure out archive type; pass any format specific options to the
80
	 * archive option processing routine; call the format init routine. We
81
	 * also save current time for ls_list() so we do not make a system
82
	 * call for each file we need to print. If verbose (vflag) start up
83
	 * the name and group caches.
84
	 */
85

162
	if ((get_arc() < 0) || ((*frmt->options)() < 0) ||
86
54
	    ((*frmt->st_rd)() < 0))
87
		return;
88
89
54
	now = time(NULL);
90
91
	/*
92
	 * step through the archive until the format says it is done
93
	 */
94
708
	while (next_head(arcn) == 0) {
95

600
		if (arcn->type == PAX_GLL || arcn->type == PAX_GLF) {
96
			/*
97
			 * we need to read, to get the real filename
98
			 */
99
			off_t cnt;
100
			if (!rd_wrfile(arcn, arcn->type == PAX_GLF
101
			    ? -1 : -2, &cnt))
102
				(void)rd_skip(cnt + arcn->pad);
103
			continue;
104
		}
105
106
		/*
107
		 * check for pattern, and user specified options match.
108
		 * When all patterns are matched we are done.
109
		 */
110
300
		if ((res = pat_match(arcn)) < 0)
111
			break;
112
113

600
		if ((res == 0) && (sel_chk(arcn) == 0)) {
114
			/*
115
			 * pattern resulted in a selected file
116
			 */
117
300
			if (pat_sel(arcn) < 0)
118
				break;
119
120
			/*
121
			 * modify the name as requested by the user if name
122
			 * survives modification, do a listing of the file
123
			 */
124
300
			if ((res = mod_name(arcn)) < 0)
125
				break;
126
300
			if (res == 0)
127
300
				ls_list(arcn, now, stdout);
128
		}
129
130
		/*
131
		 * skip to next archive format header using values calculated
132
		 * by the format header read routine
133
		 */
134
300
		if (rd_skip(arcn->skip + arcn->pad) == 1)
135
			break;
136
	}
137
138
	/*
139
	 * all done, let format have a chance to cleanup, and make sure that
140
	 * the patterns supplied by the user were all matched
141
	 */
142
54
	(void)(*frmt->end_rd)();
143
54
	(void)sigprocmask(SIG_BLOCK, &s_mask, NULL);
144
54
	ar_close(0);
145
54
	pat_chk();
146
108
}
147
148
static int
149
cmp_file_times(int mtime_flag, int ctime_flag, ARCHD *arcn, struct stat *sbp)
150
{
151
	struct stat sb;
152
153
	if (sbp == NULL) {
154
		if (lstat(arcn->name, &sb) != 0)
155
			return (0);
156
		sbp = &sb;
157
	}
158
159
	if (ctime_flag && mtime_flag)
160
		return (timespeccmp(&arcn->sb.st_mtim, &sbp->st_mtim, <=) &&
161
		        timespeccmp(&arcn->sb.st_ctim, &sbp->st_ctim, <=));
162
	else if (ctime_flag)
163
		return (timespeccmp(&arcn->sb.st_ctim, &sbp->st_ctim, <=));
164
	else
165
		return (timespeccmp(&arcn->sb.st_mtim, &sbp->st_mtim, <=));
166
}
167
168
/*
169
 * extract()
170
 *	extract the member(s) of an archive as specified by user supplied
171
 *	pattern(s) (no patterns extracts all members)
172
 */
173
174
void
175
extract(void)
176
{
177
	ARCHD *arcn;
178
	int res;
179
12
	off_t cnt;
180
6
	ARCHD archd;
181
	int fd;
182
	time_t now;
183
184
6
	sltab_start();
185
186
	arcn = &archd;
187
	/*
188
	 * figure out archive type; pass any format specific options to the
189
	 * archive option processing routine; call the format init routine;
190
	 * start up the directory modification time and access mode database
191
	 */
192

18
	if ((get_arc() < 0) || ((*frmt->options)() < 0) ||
193
12
	    ((*frmt->st_rd)() < 0) || (dir_start() < 0))
194
		return;
195
196
	/*
197
	 * When we are doing interactive rename, we store the mapping of names
198
	 * so we can fix up hard links files later in the archive.
199
	 */
200

6
	if (iflag && (name_start() < 0))
201
		return;
202
203
6
	now = time(NULL);
204
205
	/*
206
	 * step through each entry on the archive until the format read routine
207
	 * says it is done
208
	 */
209
96
	while (next_head(arcn) == 0) {
210

84
		if (arcn->type == PAX_GLL || arcn->type == PAX_GLF) {
211
			/*
212
			 * we need to read, to get the real filename
213
			 */
214
			if (!rd_wrfile(arcn, arcn->type == PAX_GLF
215
			    ? -1 : -2, &cnt))
216
				(void)rd_skip(cnt + arcn->pad);
217
			continue;
218
		}
219
220
		/*
221
		 * check for pattern, and user specified options match. When
222
		 * all the patterns are matched we are done
223
		 */
224
42
		if ((res = pat_match(arcn)) < 0)
225
			break;
226
227

84
		if ((res > 0) || (sel_chk(arcn) != 0)) {
228
			/*
229
			 * file is not selected. skip past any file data and
230
			 * padding and go back for the next archive member
231
			 */
232
			(void)rd_skip(arcn->skip + arcn->pad);
233
			continue;
234
		}
235
236
		/*
237
		 * with -u or -D only extract when the archive member is newer
238
		 * than the file with the same name in the file system (no
239
		 * test of being the same type is required).
240
		 * NOTE: this test is done BEFORE name modifications as
241
		 * specified by pax. this operation can be confusing to the
242
		 * user who might expect the test to be done on an existing
243
		 * file AFTER the name mod. In honesty the pax spec is probably
244
		 * flawed in this respect.
245
		 */
246

42
		if ((uflag || Dflag) &&
247
		    cmp_file_times(uflag, Dflag, arcn, NULL)) {
248
			(void)rd_skip(arcn->skip + arcn->pad);
249
			continue;
250
		}
251
252
		/*
253
		 * this archive member is now been selected. modify the name.
254
		 */
255

84
		if ((pat_sel(arcn) < 0) || ((res = mod_name(arcn)) < 0))
256
			break;
257
42
		if (res > 0) {
258
			/*
259
			 * a bad name mod, skip and purge name from link table
260
			 */
261
			purg_lnk(arcn);
262
			(void)rd_skip(arcn->skip + arcn->pad);
263
			continue;
264
		}
265
266
		/*
267
		 * Non standard -Y and -Z flag. When the existing file is
268
		 * same age or newer skip
269
		 */
270

42
		if ((Yflag || Zflag) &&
271
		    cmp_file_times(Yflag, Zflag, arcn, NULL)) {
272
			(void)rd_skip(arcn->skip + arcn->pad);
273
			continue;
274
		}
275
276
42
		if (vflag) {
277
			if (vflag > 1)
278
				ls_list(arcn, now, listf);
279
			else {
280
				(void)safe_print(arcn->name, listf);
281
				vfpart = 1;
282
			}
283
		}
284
285
		/*
286
		 * if required, chdir around.
287
		 */
288

42
		if ((arcn->pat != NULL) && (arcn->pat->chdname != NULL))
289
			if (chdir(arcn->pat->chdname) != 0)
290
				syswarn(1, errno, "Cannot chdir to %s",
291
				    arcn->pat->chdname);
292
293
		/*
294
		 * all ok, extract this member based on type
295
		 */
296

66
		if (!PAX_IS_REG(arcn->type)) {
297
			/*
298
			 * process archive members that are not regular files.
299
			 * throw out padding and any data that might follow the
300
			 * header (as determined by the format).
301
			 */
302

36
			if (PAX_IS_HARDLINK(arcn->type))
303
12
				res = lnk_creat(arcn);
304
			else
305
12
				res = node_creat(arcn);
306
307
24
			(void)rd_skip(arcn->skip + arcn->pad);
308
24
			if (res < 0)
309
				purg_lnk(arcn);
310
311
24
			if (vflag && vfpart) {
312
				(void)putc('\n', listf);
313
				vfpart = 0;
314
			}
315
			goto popd;
316
		}
317
		/*
318
		 * we have a file with data here. If we can not create it, skip
319
		 * over the data and purge the name from hard link table
320
		 */
321
18
		if ((fd = file_creat(arcn)) < 0) {
322
			(void)rd_skip(arcn->skip + arcn->pad);
323
			purg_lnk(arcn);
324
			goto popd;
325
		}
326
		/*
327
		 * extract the file from the archive and skip over padding and
328
		 * any unprocessed data
329
		 */
330
18
		res = rd_wrfile(arcn, fd, &cnt);
331
18
		file_close(arcn, fd);
332
18
		if (vflag && vfpart) {
333
			(void)putc('\n', listf);
334
			vfpart = 0;
335
		}
336
18
		if (!res)
337
18
			(void)rd_skip(cnt + arcn->pad);
338
339
popd:
340
		/*
341
		 * if required, chdir around.
342
		 */
343

42
		if ((arcn->pat != NULL) && (arcn->pat->chdname != NULL))
344
			if (fchdir(cwdfd) != 0)
345
				syswarn(1, errno,
346
				    "Can't fchdir to starting directory");
347
	}
348
349
	/*
350
	 * all done, restore directory modes and times as required; make sure
351
	 * all patterns supplied by the user were matched; block off signals
352
	 * to avoid chance for multiple entry into the cleanup code.
353
	 */
354
6
	(void)(*frmt->end_rd)();
355
6
	(void)sigprocmask(SIG_BLOCK, &s_mask, NULL);
356
6
	ar_close(0);
357
6
	sltab_process(0);
358
6
	proc_dir(0);
359
6
	pat_chk();
360
12
}
361
362
/*
363
 * wr_archive()
364
 *	Write an archive. used in both creating a new archive and appends on
365
 *	previously written archive.
366
 */
367
368
static void
369
wr_archive(ARCHD *arcn, int is_app)
370
{
371
	int res;
372
	int hlk;
373
	int wr_one;
374
80
	off_t cnt;
375
	int (*wrf)(ARCHD *);
376
40
	int fd = -1;
377
	time_t now;
378
379
	/*
380
	 * if this format supports hard link storage, start up the database
381
	 * that detects them.
382
	 */
383

74
	if (((hlk = frmt->hlk) == 1) && (lnk_start() < 0))
384
		return;
385
386
	/*
387
	 * if this is not append, and there are no files, we do not write a
388
	 * trailer
389
	 */
390
	wr_one = is_app;
391
392
	/*
393
	 * start up the file traversal code and format specific write
394
	 */
395
40
	if (ftree_start() < 0) {
396
12
		if (is_app)
397
			goto trailer;
398
6
		return;
399
28
	} else if (((*frmt->st_wr)() < 0))
400
		return;
401
402
28
	wrf = frmt->wr;
403
404
	/*
405
	 * When we are doing interactive rename, we store the mapping of names
406
	 * so we can fix up hard links files later in the archive.
407
	 */
408

28
	if (iflag && (name_start() < 0))
409
		return;
410
411
28
	now = time(NULL);
412
413
	/*
414
	 * while there are files to archive, process them one at at time
415
	 */
416
254
	while (next_file(arcn) == 0) {
417
		/*
418
		 * check if this file meets user specified options match.
419
		 */
420
113
		if (sel_chk(arcn) != 0)
421
			continue;
422
113
		fd = -1;
423
113
		if (uflag) {
424
			/*
425
			 * only archive if this file is newer than a file with
426
			 * the same name that is already stored on the archive
427
			 */
428
			if ((res = chk_ftime(arcn)) < 0)
429
				break;
430
			if (res > 0) {
431
				ftree_skipped_newer(arcn);
432
				continue;
433
			}
434
		}
435
436
		/*
437
		 * this file is considered selected now. see if this is a hard
438
		 * link to a file already stored
439
		 */
440
113
		ftree_sel(arcn);
441

226
		if (hlk && (chk_lnk(arcn) < 0))
442
			break;
443
444

169
		if (PAX_IS_REG(arcn->type) || (arcn->type == PAX_HRG)) {
445
			/*
446
			 * we will have to read this file. by opening it now we
447
			 * can avoid writing a header to the archive for a file
448
			 * we were later unable to read (we also purge it from
449
			 * the link table).
450
			 */
451
97
			if ((fd = open(arcn->org_name, O_RDONLY, 0)) < 0) {
452
				syswarn(1,errno, "Unable to open %s to read",
453
					arcn->org_name);
454
				purg_lnk(arcn);
455
				continue;
456
			}
457
		}
458
459
		/*
460
		 * Now modify the name as requested by the user
461
		 */
462
113
		if ((res = mod_name(arcn)) < 0) {
463
			/*
464
			 * name modification says to skip this file, close the
465
			 * file and purge link table entry
466
			 */
467
			rdfile_close(arcn, &fd);
468
			purg_lnk(arcn);
469
			break;
470
		}
471
472

226
		if ((res > 0) || (docrc && (set_crc(arcn, fd) < 0))) {
473
			/*
474
			 * unable to obtain the crc we need, close the file,
475
			 * purge link table entry
476
			 */
477
			rdfile_close(arcn, &fd);
478
			purg_lnk(arcn);
479
			continue;
480
		}
481
482
113
		if (vflag) {
483
			if (vflag > 1)
484
				ls_list(arcn, now, listf);
485
			else {
486
				(void)safe_print(arcn->name, listf);
487
				vfpart = 1;
488
			}
489
		}
490
113
		++flcnt;
491
492
		/*
493
		 * looks safe to store the file, have the format specific
494
		 * routine write routine store the file header on the archive
495
		 */
496
113
		if ((res = (*wrf)(arcn)) < 0) {
497
			rdfile_close(arcn, &fd);
498
			break;
499
		}
500
		wr_one = 1;
501
113
		if (res > 0) {
502
			/*
503
			 * format write says no file data needs to be stored
504
			 * so we are done messing with this file
505
			 */
506
28
			if (vflag && vfpart) {
507
				(void)putc('\n', listf);
508
				vfpart = 0;
509
			}
510
28
			rdfile_close(arcn, &fd);
511
28
			continue;
512
		}
513
514
		/*
515
		 * Add file data to the archive, quit on write error. if we
516
		 * cannot write the entire file contents to the archive we
517
		 * must pad the archive to replace the missing file data
518
		 * (otherwise during an extract the file header for the file
519
		 * which FOLLOWS this one will not be where we expect it to
520
		 * be).
521
		 */
522
85
		res = wr_rdfile(arcn, fd, &cnt);
523
85
		rdfile_close(arcn, &fd);
524
85
		if (vflag && vfpart) {
525
			(void)putc('\n', listf);
526
			vfpart = 0;
527
		}
528
85
		if (res < 0)
529
			break;
530
531
		/*
532
		 * pad as required, cnt is number of bytes not written
533
		 */
534

148
		if (((cnt > 0) && (wr_skip(cnt) < 0)) ||
535
148
		    ((arcn->pad > 0) && (wr_skip(arcn->pad) < 0)))
536
			break;
537
	}
538
539
trailer:
540
	/*
541
	 * tell format to write trailer; pad to block boundary; reset directory
542
	 * mode/access times, and check if all patterns supplied by the user
543
	 * were matched. block off signals to avoid chance for multiple entry
544
	 * into the cleanup code
545
	 */
546
34
	if (wr_one) {
547
34
		(*frmt->end_wr)();
548
34
		wr_fin();
549
34
	}
550
34
	(void)sigprocmask(SIG_BLOCK, &s_mask, NULL);
551
34
	ar_close(0);
552
34
	if (tflag)
553
		proc_dir(0);
554
34
	ftree_chk();
555
74
}
556
557
/*
558
 * append()
559
 *	Add file to previously written archive. Archive format specified by the
560
 *	user must agree with archive. The archive is read first to collect
561
 *	modification times (if -u) and locate the archive trailer. The archive
562
 *	is positioned in front of the record with the trailer and wr_archive()
563
 *	is called to add the new members.
564
 *	PAX IMPLEMENTATION DETAIL NOTE:
565
 *	-u is implemented by adding the new members to the end of the archive.
566
 *	Care is taken so that these do not end up as links to the older
567
 *	version of the same file already stored in the archive. It is expected
568
 *	when extraction occurs these newer versions will over-write the older
569
 *	ones stored "earlier" in the archive (this may be a bad assumption as
570
 *	it depends on the implementation of the program doing the extraction).
571
 *	It is really difficult to splice in members without either re-writing
572
 *	the entire archive (from the point were the old version was), or having
573
 *	assistance of the format specification in terms of a special update
574
 *	header that invalidates a previous archive record. The posix spec left
575
 *	the method used to implement -u unspecified. This pax is able to
576
 *	over write existing files that it creates.
577
 */
578
579
void
580
append(void)
581
{
582
	ARCHD *arcn;
583
	int res;
584
36
	ARCHD archd;
585
	FSUB *orgfrmt;
586
	int udev;
587
	off_t tlen;
588
589
	arcn = &archd;
590
18
	orgfrmt = frmt;
591
592
	/*
593
	 * Do not allow an append operation if the actual archive is of a
594
	 * different format than the user specified format.
595
	 */
596
18
	if (get_arc() < 0)
597
		return;
598

18
	if ((orgfrmt != NULL) && (orgfrmt != frmt)) {
599
		paxwarn(1, "Cannot mix current archive format %s with %s",
600
		    frmt->name, orgfrmt->name);
601
		return;
602
	}
603
604
	/*
605
	 * pass the format any options and start up format
606
	 */
607

36
	if (((*frmt->options)() < 0) || ((*frmt->st_rd)() < 0))
608
		return;
609
610
	/*
611
	 * if we only are adding members that are newer, we need to save the
612
	 * mod times for all files we see.
613
	 */
614

18
	if (uflag && (ftime_start() < 0))
615
		return;
616
617
	/*
618
	 * some archive formats encode hard links by recording the device and
619
	 * file serial number (inode) but copy the file anyway (multiple times)
620
	 * to the archive. When we append, we run the risk that newly added
621
	 * files may have the same device and inode numbers as those recorded
622
	 * on the archive but during a previous run. If this happens, when the
623
	 * archive is extracted we get INCORRECT hard links. We avoid this by
624
	 * remapping the device numbers so that newly added files will never
625
	 * use the same device number as one found on the archive. remapping
626
	 * allows new members to safely have links among themselves. remapping
627
	 * also avoids problems with file inode (serial number) truncations
628
	 * when the inode number is larger than storage space in the archive
629
	 * header. See the remap routines for more details.
630
	 */
631

18
	if ((udev = frmt->udev) && (dev_start() < 0))
632
		return;
633
634
	/*
635
	 * reading the archive may take a long time. If verbose tell the user
636
	 */
637
18
	if (vflag) {
638
		(void)fprintf(listf,
639
			"%s: Reading archive to position at the end...", argv0);
640
		vfpart = 1;
641
	}
642
643
	/*
644
	 * step through the archive until the format says it is done
645
	 */
646
72
	while (next_head(arcn) == 0) {
647
		/*
648
		 * check if this file meets user specified options.
649
		 */
650
18
		if (sel_chk(arcn) != 0) {
651
			if (rd_skip(arcn->skip + arcn->pad) == 1)
652
				break;
653
			continue;
654
		}
655
656
18
		if (uflag) {
657
			/*
658
			 * see if this is the newest version of this file has
659
			 * already been seen, if so skip.
660
			 */
661
			if ((res = chk_ftime(arcn)) < 0)
662
				break;
663
			if (res > 0) {
664
				if (rd_skip(arcn->skip + arcn->pad) == 1)
665
					break;
666
				continue;
667
			}
668
		}
669
670
		/*
671
		 * Store this device number. Device numbers seen during the
672
		 * read phase of append will cause newly appended files with a
673
		 * device number seen in the old part of the archive to be
674
		 * remapped to an unused device number.
675
		 */
676

36
		if ((udev && (add_dev(arcn) < 0)) ||
677
18
		    (rd_skip(arcn->skip + arcn->pad) == 1))
678
			break;
679
	}
680
681
	/*
682
	 * done, finish up read and get the number of bytes to back up so we
683
	 * can add new members. The format might have used the hard link table,
684
	 * purge it.
685
	 */
686
18
	tlen = (*frmt->end_rd)();
687
18
	lnk_end();
688
689
	/*
690
	 * try to position for write, if this fails quit. if any error occurs,
691
	 * we will refuse to write
692
	 */
693
18
	if (appnd_start(tlen) < 0)
694
		return;
695
696
	/*
697
	 * tell the user we are done reading.
698
	 */
699
18
	if (vflag && vfpart) {
700
		(void)fputs("done.\n", listf);
701
		vfpart = 0;
702
	}
703
704
	/*
705
	 * go to the writing phase to add the new members
706
	 */
707
18
	wr_archive(arcn, 1);
708
36
}
709
710
/*
711
 * archive()
712
 *	write a new archive
713
 */
714
715
void
716
archive(void)
717
{
718
44
	ARCHD archd;
719
720
	/*
721
	 * if we only are adding members that are newer, we need to save the
722
	 * mod times for all files; set up for writing; pass the format any
723
	 * options write the archive
724
	 */
725

44
	if ((uflag && (ftime_start() < 0)) || (wr_start() < 0))
726
		return;
727
22
	if ((*frmt->options)() < 0)
728
		return;
729
730
22
	wr_archive(&archd, 0);
731
44
}
732
733
/*
734
 * copy()
735
 *	copy files from one part of the file system to another. this does not
736
 *	use any archive storage. The EFFECT OF THE COPY IS THE SAME as if an
737
 *	archive was written and then extracted in the destination directory
738
 *	(except the files are forced to be under the destination directory).
739
 */
740
741
void
742
copy(void)
743
{
744
	ARCHD *arcn;
745
	int res;
746
	int fddest;
747
	char *dest_pt;
748
	size_t dlen;
749
	size_t drem;
750
	int fdsrc = -1;
751
	struct stat sb;
752
	ARCHD archd;
753
	char dirbuf[PAXPATHLEN+1];
754
755
	sltab_start();
756
757
	arcn = &archd;
758
	/*
759
	 * set up the destination dir path and make sure it is a directory. We
760
	 * make sure we have a trailing / on the destination
761
	 */
762
	dlen = strlcpy(dirbuf, dirptr, sizeof(dirbuf));
763
	if (dlen >= sizeof(dirbuf) ||
764
	    (dlen == sizeof(dirbuf) - 1 && dirbuf[dlen - 1] != '/')) {
765
		paxwarn(1, "directory name is too long %s", dirptr);
766
		return;
767
	}
768
	dest_pt = dirbuf + dlen;
769
	if (*(dest_pt-1) != '/') {
770
		*dest_pt++ = '/';
771
		*dest_pt = '\0';
772
		++dlen;
773
	}
774
	drem = PAXPATHLEN - dlen;
775
776
	if (stat(dirptr, &sb) < 0) {
777
		syswarn(1, errno, "Cannot access destination directory %s",
778
			dirptr);
779
		return;
780
	}
781
	if (!S_ISDIR(sb.st_mode)) {
782
		paxwarn(1, "Destination is not a directory %s", dirptr);
783
		return;
784
	}
785
786
	/*
787
	 * start up the hard link table; file traversal routines and the
788
	 * modification time and access mode database
789
	 */
790
	if ((lnk_start() < 0) || (ftree_start() < 0) || (dir_start() < 0))
791
		return;
792
793
	/*
794
	 * When we are doing interactive rename, we store the mapping of names
795
	 * so we can fix up hard links files later in the archive.
796
	 */
797
	if (iflag && (name_start() < 0))
798
		return;
799
800
	/*
801
	 * set up to cp file trees
802
	 */
803
	cp_start();
804
805
	/*
806
	 * while there are files to archive, process them
807
	 */
808
	while (next_file(arcn) == 0) {
809
		fdsrc = -1;
810
811
		/*
812
		 * check if this file meets user specified options
813
		 */
814
		if (sel_chk(arcn) != 0)
815
			continue;
816
817
		/*
818
		 * if there is already a file in the destination directory with
819
		 * the same name and it is newer, skip the one stored on the
820
		 * archive.
821
		 * NOTE: this test is done BEFORE name modifications as
822
		 * specified by pax. this can be confusing to the user who
823
		 * might expect the test to be done on an existing file AFTER
824
		 * the name mod. In honesty the pax spec is probably flawed in
825
		 * this respect
826
		 */
827
		if (uflag || Dflag) {
828
			/*
829
			 * create the destination name
830
			 */
831
			if (strlcpy(dest_pt, arcn->name + (*arcn->name == '/'),
832
			    drem + 1) > drem) {
833
				paxwarn(1, "Destination pathname too long %s",
834
					arcn->name);
835
				continue;
836
			}
837
838
			/*
839
			 * if existing file is same age or newer skip
840
			 */
841
			res = lstat(dirbuf, &sb);
842
			*dest_pt = '\0';
843
844
			if (res == 0) {
845
				ftree_skipped_newer(arcn);
846
				if (cmp_file_times(uflag, Dflag, arcn, &sb))
847
					continue;
848
			}
849
		}
850
851
		/*
852
		 * this file is considered selected. See if this is a hard link
853
		 * to a previous file; modify the name as requested by the
854
		 * user; set the final destination.
855
		 */
856
		ftree_sel(arcn);
857
		if ((chk_lnk(arcn) < 0) || ((res = mod_name(arcn)) < 0))
858
			break;
859
		if ((res > 0) || (set_dest(arcn, dirbuf, dlen) < 0)) {
860
			/*
861
			 * skip file, purge from link table
862
			 */
863
			purg_lnk(arcn);
864
			continue;
865
		}
866
867
		/*
868
		 * Non standard -Y and -Z flag. When the existing file is
869
		 * same age or newer skip
870
		 */
871
		if ((Yflag || Zflag) &&
872
		    cmp_file_times(Yflag, Zflag, arcn, NULL))
873
			continue;
874
875
		if (vflag) {
876
			(void)safe_print(arcn->name, listf);
877
			vfpart = 1;
878
		}
879
		++flcnt;
880
881
		/*
882
		 * try to create a hard link to the src file if requested
883
		 * but make sure we are not trying to overwrite ourselves.
884
		 */
885
		if (lflag)
886
			res = cross_lnk(arcn);
887
		else
888
			res = chk_same(arcn);
889
		if (res <= 0) {
890
			if (vflag && vfpart) {
891
				(void)putc('\n', listf);
892
				vfpart = 0;
893
			}
894
			continue;
895
		}
896
897
		/*
898
		 * have to create a new file
899
		 */
900
		if (!PAX_IS_REG(arcn->type)) {
901
			/*
902
			 * create a link or special file
903
			 */
904
			if (PAX_IS_HARDLINK(arcn->type))
905
				res = lnk_creat(arcn);
906
			else
907
				res = node_creat(arcn);
908
			if (res < 0)
909
				purg_lnk(arcn);
910
			if (vflag && vfpart) {
911
				(void)putc('\n', listf);
912
				vfpart = 0;
913
			}
914
			continue;
915
		}
916
917
		/*
918
		 * have to copy a regular file to the destination directory.
919
		 * first open source file and then create the destination file
920
		 */
921
		if ((fdsrc = open(arcn->org_name, O_RDONLY, 0)) < 0) {
922
			syswarn(1, errno, "Unable to open %s to read",
923
			    arcn->org_name);
924
			purg_lnk(arcn);
925
			continue;
926
		}
927
		if ((fddest = file_creat(arcn)) < 0) {
928
			rdfile_close(arcn, &fdsrc);
929
			purg_lnk(arcn);
930
			continue;
931
		}
932
933
		/*
934
		 * copy source file data to the destination file
935
		 */
936
		cp_file(arcn, fdsrc, fddest);
937
		file_close(arcn, fddest);
938
		rdfile_close(arcn, &fdsrc);
939
940
		if (vflag && vfpart) {
941
			(void)putc('\n', listf);
942
			vfpart = 0;
943
		}
944
	}
945
946
	/*
947
	 * restore directory modes and times as required; make sure all
948
	 * patterns were selected block off signals to avoid chance for
949
	 * multiple entry into the cleanup code.
950
	 */
951
	(void)sigprocmask(SIG_BLOCK, &s_mask, NULL);
952
	ar_close(0);
953
	sltab_process(0);
954
	proc_dir(0);
955
	ftree_chk();
956
}
957
958
/*
959
 * next_head()
960
 *	try to find a valid header in the archive. Uses format specific
961
 *	routines to extract the header and id the trailer. Trailers may be
962
 *	located within a valid header or in an invalid header (the location
963
 *	is format specific. The inhead field from the option table tells us
964
 *	where to look for the trailer).
965
 *	We keep reading (and resyncing) until we get enough contiguous data
966
 *	to check for a header. If we cannot find one, we shift by a byte
967
 *	add a new byte from the archive to the end of the buffer and try again.
968
 *	If we get a read error, we throw out what we have (as we must have
969
 *	contiguous data) and start over again.
970
 *	ASSUMED: headers fit within a BLKMULT header.
971
 * Return:
972
 *	0 if we got a header, -1 if we are unable to ever find another one
973
 *	(we reached the end of input, or we reached the limit on retries. see
974
 *	the specs for rd_wrbuf() for more details)
975
 */
976
977
static int
978
next_head(ARCHD *arcn)
979
{
980
	int ret;
981
	char *hdend;
982
	int res;
983
	int shftsz;
984
	int hsz;
985
	int in_resync = 0;		/* set when we are in resync mode */
986
876
	int cnt = 0;			/* counter for trailer function */
987
	int first = 1;			/* on 1st read, EOF isn't premature. */
988
989
	/*
990
	 * set up initial conditions, we want a whole frmt->hsz block as we
991
	 * have no data yet.
992
	 */
993
438
	res = hsz = frmt->hsz;
994
	hdend = hdbuf;
995
438
	shftsz = hsz - 1;
996
438
	for (;;) {
997
		/*
998
		 * keep looping until we get a contiguous FULL buffer
999
		 * (frmt->hsz is the proper size)
1000
		 */
1001
510
		for (;;) {
1002
510
			if ((ret = rd_wrbuf(hdend, res)) == res)
1003
				break;
1004
1005
			/*
1006
			 * If we read 0 bytes (EOF) from an archive when we
1007
			 * expect to find a header, we have stepped upon
1008
			 * an archive without the customary block of zeroes
1009
			 * end marker.  It's just stupid to error out on
1010
			 * them, so exit gracefully.
1011
			 */
1012
6
			if (first && ret == 0)
1013
6
				return(-1);
1014
			first = 0;
1015
1016
			/*
1017
			 * some kind of archive read problem, try to resync the
1018
			 * storage device, better give the user the bad news.
1019
			 */
1020
			if ((ret == 0) || (rd_sync() < 0)) {
1021
				paxwarn(1,"Premature end of file on archive read");
1022
				return(-1);
1023
			}
1024
			if (!in_resync) {
1025
				if (act == APPND) {
1026
					paxwarn(1,
1027
					  "Archive I/O error, cannot continue");
1028
					return(-1);
1029
				}
1030
				paxwarn(1,"Archive I/O error. Trying to recover.");
1031
				++in_resync;
1032
			}
1033
1034
			/*
1035
			 * oh well, throw it all out and start over
1036
			 */
1037
			res = hsz;
1038
			hdend = hdbuf;
1039
		}
1040
1041
		/*
1042
		 * ok we have a contiguous buffer of the right size. Call the
1043
		 * format read routine. If this was not a valid header and this
1044
		 * format stores trailers outside of the header, call the
1045
		 * format specific trailer routine to check for a trailer. We
1046
		 * have to watch out that we do not mis-identify file data or
1047
		 * block padding as a header or trailer. Format specific
1048
		 * trailer functions must NOT check for the trailer while we
1049
		 * are running in resync mode. Some trailer functions may tell
1050
		 * us that this block cannot contain a valid header either, so
1051
		 * we then throw out the entire block and start over.
1052
		 */
1053
504
		if ((*frmt->rd)(arcn, hdbuf) == 0)
1054
			break;
1055
1056
144
		if (!frmt->inhead) {
1057
			/*
1058
			 * this format has trailers outside of valid headers
1059
			 */
1060
144
			if ((ret = (*frmt->trail)(arcn,hdbuf,in_resync,&cnt)) == 0){
1061
				/*
1062
				 * valid trailer found, drain input as required
1063
				 */
1064
72
				ar_drain();
1065
72
				return(-1);
1066
			}
1067
1068
72
			if (ret == 1) {
1069
				/*
1070
				 * we are in resync and we were told to throw
1071
				 * the whole block out because none of the
1072
				 * bytes in this block can be used to form a
1073
				 * valid header
1074
				 */
1075
				res = hsz;
1076
				hdend = hdbuf;
1077
72
				continue;
1078
			}
1079
		}
1080
1081
		/*
1082
		 * Brute force section.
1083
		 * not a valid header. We may be able to find a header yet. So
1084
		 * we shift over by one byte, and set up to read one byte at a
1085
		 * time from the archive and place it at the end of the buffer.
1086
		 * We will keep moving byte at a time until we find a header or
1087
		 * get a read error and have to start over.
1088
		 */
1089
		if (!in_resync) {
1090
			if (act == APPND) {
1091
				paxwarn(1,"Unable to append, archive header flaw");
1092
				return(-1);
1093
			}
1094
			paxwarn(1,"Invalid header, starting valid header search.");
1095
			++in_resync;
1096
		}
1097
		memmove(hdbuf, hdbuf+1, shftsz);
1098
		res = 1;
1099
		hdend = hdbuf + shftsz;
1100
	}
1101
1102
	/*
1103
	 * ok got a valid header, check for trailer if format encodes it in the
1104
	 * the header. NOTE: the parameters are different than trailer routines
1105
	 * which encode trailers outside of the header!
1106
	 */
1107

360
	if (frmt->inhead && ((*frmt->trail)(arcn,NULL,0,NULL) == 0)) {
1108
		/*
1109
		 * valid trailer found, drain input as required
1110
		 */
1111
		ar_drain();
1112
		return(-1);
1113
	}
1114
1115
360
	++flcnt;
1116
360
	return(0);
1117
438
}
1118
1119
/*
1120
 * get_arc()
1121
 *	Figure out what format an archive is. Handles archive with flaws by
1122
 *	brute force searches for a legal header in any supported format. The
1123
 *	format id routines have to be careful to NOT mis-identify a format.
1124
 *	ASSUMED: headers fit within a BLKMULT header.
1125
 * Return:
1126
 *	0 if archive found -1 otherwise
1127
 */
1128
1129
static int
1130
get_arc(void)
1131
{
1132
	int i;
1133
	int hdsz = 0;
1134
	int res;
1135
	int minhd = BLKMULT;
1136
	char *hdend;
1137
	int notice = 0;
1138
1139
	/*
1140
	 * find the smallest header size in all archive formats and then set up
1141
	 * to read the archive.
1142
	 */
1143
1794
	for (i = 0; ford[i] >= 0; ++i) {
1144

1248
		if (fsub[ford[i]].name != NULL && fsub[ford[i]].hsz < minhd)
1145
234
			minhd = fsub[ford[i]].hsz;
1146
	}
1147
78
	if (rd_start() < 0)
1148
		return(-1);
1149
	res = BLKMULT;
1150
	hdsz = 0;
1151
	hdend = hdbuf;
1152
78
	for (;;) {
1153
78
		for (;;) {
1154
			/*
1155
			 * fill the buffer with at least the smallest header
1156
			 */
1157
78
			i = rd_wrbuf(hdend, res);
1158
78
			if (i > 0)
1159
78
				hdsz += i;
1160
78
			if (hdsz >= minhd)
1161
				break;
1162
1163
			/*
1164
			 * if we cannot recover from a read error quit
1165
			 */
1166
			if ((i == 0) || (rd_sync() < 0))
1167
				goto out;
1168
1169
			/*
1170
			 * when we get an error none of the data we already
1171
			 * have can be used to create a legal header (we just
1172
			 * got an error in the middle), so we throw it all out
1173
			 * and refill the buffer with fresh data.
1174
			 */
1175
			res = BLKMULT;
1176
			hdsz = 0;
1177
			hdend = hdbuf;
1178
			if (!notice) {
1179
				if (act == APPND)
1180
					return(-1);
1181
				paxwarn(1,"Cannot identify format. Searching...");
1182
				++notice;
1183
			}
1184
		}
1185
1186
		/*
1187
		 * we have at least the size of the smallest header in any
1188
		 * archive format. Look to see if we have a match. The array
1189
		 * ford[] is used to specify the header id order to reduce the
1190
		 * chance of incorrectly id'ing a valid header (some formats
1191
		 * may be subsets of each other and the order would then be
1192
		 * important).
1193
		 */
1194
180
		for (i = 0; ford[i] >= 0; ++i) {
1195

180
			if (fsub[ford[i]].id == NULL ||
1196
90
			    (*fsub[ford[i]].id)(hdbuf, hdsz) < 0)
1197
				continue;
1198
78
			frmt = &(fsub[ford[i]]);
1199
			/*
1200
			 * yuck, to avoid slow special case code in the extract
1201
			 * routines, just push this header back as if it was
1202
			 * not seen. We have left extra space at start of the
1203
			 * buffer for this purpose. This is a bit ugly, but
1204
			 * adding all the special case code is far worse.
1205
			 */
1206
78
			pback(hdbuf, hdsz);
1207
78
			return(0);
1208
		}
1209
1210
		/*
1211
		 * We have a flawed archive, no match. we start searching, but
1212
		 * we never allow additions to flawed archives
1213
		 */
1214
		if (!notice) {
1215
			if (act == APPND)
1216
				return(-1);
1217
			paxwarn(1, "Cannot identify format. Searching...");
1218
			++notice;
1219
		}
1220
1221
		/*
1222
		 * brute force search for a header that we can id.
1223
		 * we shift through byte at a time. this is slow, but we cannot
1224
		 * determine the nature of the flaw in the archive in a
1225
		 * portable manner
1226
		 */
1227
		if (--hdsz > 0) {
1228
			memmove(hdbuf, hdbuf+1, hdsz);
1229
			res = BLKMULT - hdsz;
1230
			hdend = hdbuf + hdsz;
1231
		} else {
1232
			res = BLKMULT;
1233
			hdend = hdbuf;
1234
			hdsz = 0;
1235
		}
1236
	}
1237
1238
    out:
1239
	/*
1240
	 * we cannot find a header, bow, apologize and quit
1241
	 */
1242
	paxwarn(1, "Sorry, unable to determine archive format.");
1243
	return(-1);
1244
78
}