1 /* $NetBSD: tar.c,v 1.76 2024/08/05 13:37:27 riastradh Exp $ */
2
3 /*-
4 * Copyright (c) 1992 Keith Muller.
5 * Copyright (c) 1992, 1993
6 * The Regents of the University of California. All rights reserved.
7 *
8 * This code is derived from software contributed to Berkeley by
9 * Keith Muller of the University of California, San Diego.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. Neither the name of the University nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 */
35
36 #if HAVE_NBTOOL_CONFIG_H
37 #include "nbtool_config.h"
38 #endif
39
40 #include <sys/cdefs.h>
41 #if !defined(lint)
42 #if 0
43 static char sccsid[] = "@(#)tar.c 8.2 (Berkeley) 4/18/94";
44 #else
45 __RCSID("$NetBSD: tar.c,v 1.76 2024/08/05 13:37:27 riastradh Exp $");
46 #endif
47 #endif /* not lint */
48
49 #include <sys/types.h>
50 #include <sys/time.h>
51 #include <sys/stat.h>
52 #include <sys/param.h>
53
54 #include <ctype.h>
55 #include <errno.h>
56 #include <grp.h>
57 #include <pwd.h>
58 #include <stdio.h>
59 #include <stdlib.h>
60 #include <string.h>
61 #include <unistd.h>
62
63 #include "pax.h"
64 #include "extern.h"
65 #include "tar.h"
66
67 extern struct stat tst;
68
69 /*
70 * Routines for reading, writing and header identify of various versions of tar
71 */
72
73 static int expandname(char *, size_t, char **, size_t *, const char *, size_t);
74 static void longlink(ARCHD *, int);
75 static uint32_t tar_chksm(char *, int);
76 static char *name_split(char *, int);
77 static int u32_oct(uintmax_t, char *, int, int);
78 static int umax_oct(uintmax_t, char *, int, int);
79 static int tar_gnutar_exclude_one(const char *, size_t);
80 static int check_sum(char *, size_t, char *, size_t, int);
81
82 /*
83 * Routines common to all versions of tar
84 */
85
86 static int tar_nodir; /* do not write dirs under old tar */
87 int is_gnutar; /* behave like gnu tar; enable gnu
88 * extensions and skip end-of-volume
89 * checks
90 */
91 static int seen_gnu_warning; /* Have we warned yet? */
92 static char *gnu_hack_string; /* ././@LongLink hackery */
93 static int gnu_hack_len; /* len of gnu_hack_string */
94 char *gnu_name_string; /* ././@LongLink hackery name */
95 char *gnu_link_string; /* ././@LongLink hackery link */
96 size_t gnu_name_length; /* ././@LongLink hackery name */
97 size_t gnu_link_length; /* ././@LongLink hackery link */
98 static int gnu_short_trailer; /* gnu short trailer */
99
100 static const char LONG_LINK[] = "././@LongLink";
101
102 #ifdef _PAX_
103 char DEV_0[] = "/dev/rst0";
104 char DEV_1[] = "/dev/rst1";
105 char DEV_4[] = "/dev/rst4";
106 char DEV_5[] = "/dev/rst5";
107 char DEV_7[] = "/dev/rst7";
108 char DEV_8[] = "/dev/rst8";
109 #endif
110
111 static int
check_sum(char * hd,size_t hdlen,char * bl,size_t bllen,int quiet)112 check_sum(char *hd, size_t hdlen, char *bl, size_t bllen, int quiet)
113 {
114 uint32_t hdck, blck;
115
116 hdck = asc_u32(hd, hdlen, OCT);
117 blck = tar_chksm(bl, bllen);
118
119 if (hdck != blck) {
120 if (!quiet)
121 tty_warn(0, "Header checksum %o does not match %o",
122 hdck, blck);
123 return -1;
124 }
125 return 0;
126 }
127
128
129 /*
130 * tar_endwr()
131 * add the tar trailer of two null blocks
132 * Return:
133 * 0 if ok, -1 otherwise (what wr_skip returns)
134 */
135
136 int
tar_endwr(void)137 tar_endwr(void)
138 {
139 return wr_skip((off_t)(NULLCNT * BLKMULT));
140 }
141
142 /*
143 * tar_endrd()
144 * no cleanup needed here, just return size of trailer (for append)
145 * Return:
146 * size of trailer BLKMULT
147 */
148
149 off_t
tar_endrd(void)150 tar_endrd(void)
151 {
152 return (off_t)((gnu_short_trailer ? 1 : NULLCNT) * BLKMULT);
153 }
154
155 /*
156 * tar_trail()
157 * Called to determine if a header block is a valid trailer. We are passed
158 * the block, the in_sync flag (which tells us we are in resync mode;
159 * looking for a valid header), and cnt (which starts at zero) which is
160 * used to count the number of empty blocks we have seen so far.
161 * Return:
162 * 0 if a valid trailer, -1 if not a valid trailer, or 1 if the block
163 * could never contain a header.
164 */
165
166 int
tar_trail(char * buf,int in_resync,int * cnt)167 tar_trail(char *buf, int in_resync, int *cnt)
168 {
169 int i;
170
171 gnu_short_trailer = 0;
172 /*
173 * look for all zero, trailer is two consecutive blocks of zero
174 */
175 for (i = 0; i < BLKMULT; ++i) {
176 if (buf[i] != '\0')
177 break;
178 }
179
180 /*
181 * if not all zero it is not a trailer, but MIGHT be a header.
182 */
183 if (i != BLKMULT)
184 return -1;
185
186 /*
187 * When given a zero block, we must be careful!
188 * If we are not in resync mode, check for the trailer. Have to watch
189 * out that we do not mis-identify file data as the trailer, so we do
190 * NOT try to id a trailer during resync mode. During resync mode we
191 * might as well throw this block out since a valid header can NEVER be
192 * a block of all 0 (we must have a valid file name).
193 */
194 if (!in_resync) {
195 ++*cnt;
196 /*
197 * old GNU tar (up through 1.13) only writes one block of
198 * trailers, so we pretend we got another
199 */
200 if (is_gnutar) {
201 gnu_short_trailer = 1;
202 ++*cnt;
203 }
204 if (*cnt >= NULLCNT)
205 return 0;
206 }
207 return 1;
208 }
209
210 /*
211 * u32_oct()
212 * convert an uintmax_t to an octal string. many oddball field
213 * termination characters are used by the various versions of tar in the
214 * different fields. term selects which kind to use. str is '0' padded
215 * at the front to len. we are unable to use only one format as many old
216 * tar readers are very cranky about this.
217 * Return:
218 * 0 if the number fit into the string, -1 otherwise
219 */
220
221 static int
u32_oct(uintmax_t val,char * str,int len,int term)222 u32_oct(uintmax_t val, char *str, int len, int term)
223 {
224 char *pt;
225 uint64_t p;
226
227 p = val & TOP_HALF;
228 if (p && p != TOP_HALF)
229 return -1;
230
231 val &= BOTTOM_HALF;
232
233 /*
234 * term selects the appropriate character(s) for the end of the string
235 */
236 pt = str + len - 1;
237 switch(term) {
238 case 3:
239 *pt-- = '\0';
240 break;
241 case 2:
242 *pt-- = ' ';
243 *pt-- = '\0';
244 break;
245 case 1:
246 *pt-- = ' ';
247 break;
248 case 0:
249 default:
250 *pt-- = '\0';
251 *pt-- = ' ';
252 break;
253 }
254
255 /*
256 * convert and blank pad if there is space
257 */
258 while (pt >= str) {
259 *pt-- = '0' + (char)(val & 0x7);
260 if ((val = val >> 3) == 0)
261 break;
262 }
263
264 while (pt >= str)
265 *pt-- = '0';
266 if (val != 0)
267 return -1;
268 return 0;
269 }
270
271 /*
272 * umax_oct()
273 * convert an unsigned long long to an octal string. one of many oddball
274 * field termination characters are used by the various versions of tar
275 * in the different fields. term selects which kind to use. str is '0'
276 * padded at the front to len. we are unable to use only one format as
277 * many old tar readers are very cranky about this.
278 * Return:
279 * 0 if the number fit into the string, -1 otherwise
280 */
281
282 static int
umax_oct(uintmax_t val,char * str,int len,int term)283 umax_oct(uintmax_t val, char *str, int len, int term)
284 {
285 char *pt;
286
287 /*
288 * term selects the appropriate character(s) for the end of the string
289 */
290 pt = str + len - 1;
291 switch(term) {
292 case 3:
293 *pt-- = '\0';
294 break;
295 case 2:
296 *pt-- = ' ';
297 *pt-- = '\0';
298 break;
299 case 1:
300 *pt-- = ' ';
301 break;
302 case 0:
303 default:
304 *pt-- = '\0';
305 *pt-- = ' ';
306 break;
307 }
308
309 /*
310 * convert and blank pad if there is space
311 */
312 while (pt >= str) {
313 *pt-- = '0' + (char)(val & 0x7);
314 if ((val = val >> 3) == 0)
315 break;
316 }
317
318 while (pt >= str)
319 *pt-- = '0';
320 if (val != 0)
321 return -1;
322 return 0;
323 }
324
325 /*
326 * tar_chksm()
327 * calculate the checksum for a tar block counting the checksum field as
328 * all blanks (BLNKSUM is that value pre-calculated, the sum of 8 blanks).
329 * NOTE: we use len to short circuit summing 0's on write since we ALWAYS
330 * pad headers with 0.
331 * Return:
332 * unsigned long checksum
333 */
334
335 static uint32_t
tar_chksm(char * blk,int len)336 tar_chksm(char *blk, int len)
337 {
338 char *stop;
339 char *pt;
340 uint32_t chksm = BLNKSUM; /* initial value is checksum field sum */
341
342 /*
343 * add the part of the block before the checksum field
344 */
345 pt = blk;
346 stop = blk + CHK_OFFSET;
347 while (pt < stop)
348 chksm += (uint32_t)(*pt++ & 0xff);
349 /*
350 * move past the checksum field and keep going, spec counts the
351 * checksum field as the sum of 8 blanks (which is pre-computed as
352 * BLNKSUM).
353 * ASSUMED: len is greater than CHK_OFFSET. (len is where our 0 padding
354 * starts, no point in summing zeros)
355 */
356 pt += CHK_LEN;
357 stop = blk + len;
358 while (pt < stop)
359 chksm += (uint32_t)(*pt++ & 0xff);
360 return chksm;
361 }
362
363 /*
364 * Routines for old BSD style tar (also made portable to sysV tar)
365 */
366
367 /*
368 * tar_id()
369 * determine if a block given to us is a valid tar header (and not a USTAR
370 * header). We have to be on the lookout for those pesky blocks of all
371 * zeros.
372 * Return:
373 * 0 if a tar header, -1 otherwise
374 */
375
376 int
tar_id(char * blk,int size)377 tar_id(char *blk, int size)
378 {
379 HD_TAR *hd;
380 HD_USTAR *uhd;
381 static int is_ustar = -1;
382
383 if (size < BLKMULT)
384 return -1;
385 hd = (HD_TAR *)blk;
386 uhd = (HD_USTAR *)blk;
387
388 /*
389 * check for block of zeros first, a simple and fast test, then make
390 * sure this is not a ustar header by looking for the ustar magic
391 * cookie. We should use TMAGLEN, but some USTAR archive programs are
392 * wrong and create archives missing the \0. Last we check the
393 * checksum. If this is ok we have to assume it is a valid header.
394 */
395 if (hd->name[0] == '\0')
396 return -1;
397 if (strncmp(uhd->magic, TMAGIC, TMAGLEN - 1) == 0) {
398 if (is_ustar == -1) {
399 is_ustar = 1;
400 return -1;
401 } else
402 tty_warn(0,
403 "Busted tar archive: has both ustar and old tar "
404 "records");
405 } else
406 is_ustar = 0;
407 return check_sum(hd->chksum, sizeof(hd->chksum), blk, BLKMULT, 1);
408 }
409
410 /*
411 * tar_opt()
412 * handle tar format specific -o options
413 * Return:
414 * 0 if ok -1 otherwise
415 */
416
417 int
tar_opt(void)418 tar_opt(void)
419 {
420 OPLIST *opt;
421
422 while ((opt = opt_next()) != NULL) {
423 if (strcmp(opt->name, TAR_OPTION) ||
424 strcmp(opt->value, TAR_NODIR)) {
425 tty_warn(1,
426 "Unknown tar format -o option/value pair %s=%s",
427 opt->name, opt->value);
428 tty_warn(1,
429 "%s=%s is the only supported tar format option",
430 TAR_OPTION, TAR_NODIR);
431 return -1;
432 }
433
434 /*
435 * we only support one option, and only when writing
436 */
437 if ((act != APPND) && (act != ARCHIVE)) {
438 tty_warn(1, "%s=%s is only supported when writing.",
439 opt->name, opt->value);
440 return -1;
441 }
442 tar_nodir = 1;
443 }
444 return 0;
445 }
446
447
448 /*
449 * tar_rd()
450 * extract the values out of block already determined to be a tar header.
451 * store the values in the ARCHD parameter.
452 * Return:
453 * 0
454 */
455
456 int
tar_rd(ARCHD * arcn,char * buf)457 tar_rd(ARCHD *arcn, char *buf)
458 {
459 HD_TAR *hd;
460 char *pt;
461
462 /*
463 * we only get proper sized buffers passed to us
464 */
465 if (tar_id(buf, BLKMULT) < 0)
466 return -1;
467 memset(arcn, 0, sizeof(*arcn));
468 arcn->org_name = arcn->name;
469 arcn->pat = NULL;
470 arcn->sb.st_nlink = 1;
471
472 /*
473 * copy out the name and values in the stat buffer
474 */
475 hd = (HD_TAR *)buf;
476 if (hd->linkflag != LONGLINKTYPE && hd->linkflag != LONGNAMETYPE) {
477 arcn->nlen = expandname(arcn->name, sizeof(arcn->name),
478 &gnu_name_string, &gnu_name_length, hd->name,
479 sizeof(hd->name));
480 arcn->ln_nlen = expandname(arcn->ln_name, sizeof(arcn->ln_name),
481 &gnu_link_string, &gnu_link_length, hd->linkname,
482 sizeof(hd->linkname));
483 }
484 arcn->sb.st_mode = (mode_t)(asc_u32(hd->mode,sizeof(hd->mode),OCT) &
485 0xfff);
486 arcn->sb.st_uid = (uid_t)asc_u32(hd->uid, sizeof(hd->uid), OCT);
487 arcn->sb.st_gid = (gid_t)asc_u32(hd->gid, sizeof(hd->gid), OCT);
488 arcn->sb.st_size = (off_t)ASC_OFFT(hd->size, sizeof(hd->size), OCT);
489 if (arcn->sb.st_size == -1)
490 return -1;
491 arcn->sb.st_mtime = (time_t)(int32_t)asc_u32(hd->mtime, sizeof(hd->mtime), OCT);
492 arcn->sb.st_ctime = arcn->sb.st_atime = arcn->sb.st_mtime;
493
494 /*
495 * have to look at the last character, it may be a '/' and that is used
496 * to encode this as a directory
497 */
498 pt = &(arcn->name[arcn->nlen - 1]);
499 arcn->pad = 0;
500 arcn->skip = 0;
501 switch(hd->linkflag) {
502 case SYMTYPE:
503 /*
504 * symbolic link, need to get the link name and set the type in
505 * the st_mode so -v printing will look correct.
506 */
507 arcn->type = PAX_SLK;
508 arcn->sb.st_mode |= S_IFLNK;
509 break;
510 case LNKTYPE:
511 /*
512 * hard link, need to get the link name, set the type in the
513 * st_mode and st_nlink so -v printing will look better.
514 */
515 arcn->type = PAX_HLK;
516 arcn->sb.st_nlink = 2;
517
518 /*
519 * no idea of what type this thing really points at, but
520 * we set something for printing only.
521 */
522 arcn->sb.st_mode |= S_IFREG;
523 break;
524 case LONGLINKTYPE:
525 case LONGNAMETYPE:
526 /*
527 * GNU long link/file; we tag these here and let the
528 * pax internals deal with it -- too ugly otherwise.
529 */
530 if (hd->linkflag != LONGLINKTYPE)
531 arcn->type = PAX_GLF;
532 else
533 arcn->type = PAX_GLL;
534 arcn->pad = TAR_PAD(arcn->sb.st_size);
535 arcn->skip = arcn->sb.st_size;
536 break;
537 case AREGTYPE:
538 case REGTYPE:
539 case DIRTYPE: /* see below */
540 default:
541 /*
542 * If we have a trailing / this is a directory and NOT a file.
543 * Note: V7 tar doesn't actually have DIRTYPE, but it was
544 * reported that V7 archives using USTAR directories do exist.
545 */
546 if (*pt == '/' || hd->linkflag == DIRTYPE) {
547 /*
548 * it is a directory, set the mode for -v printing
549 */
550 arcn->type = PAX_DIR;
551 arcn->sb.st_mode |= S_IFDIR;
552 arcn->sb.st_nlink = 2;
553 } else {
554 /*
555 * have a file that will be followed by data. Set the
556 * skip value to the size field and calculate the size
557 * of the padding.
558 */
559 arcn->type = PAX_REG;
560 arcn->sb.st_mode |= S_IFREG;
561 arcn->pad = TAR_PAD(arcn->sb.st_size);
562 arcn->skip = arcn->sb.st_size;
563 }
564 break;
565 }
566
567 /*
568 * strip off any trailing slash.
569 */
570 if (*pt == '/') {
571 *pt = '\0';
572 --arcn->nlen;
573 }
574 return 0;
575 }
576
577 /*
578 * tar_wr()
579 * write a tar header for the file specified in the ARCHD to the archive.
580 * Have to check for file types that cannot be stored and file names that
581 * are too long. Be careful of the term (last arg) to u32_oct, each field
582 * of tar has it own spec for the termination character(s).
583 * ASSUMED: space after header in header block is zero filled
584 * Return:
585 * 0 if file has data to be written after the header, 1 if file has NO
586 * data to write after the header, -1 if archive write failed
587 */
588
589 int
tar_wr(ARCHD * arcn)590 tar_wr(ARCHD *arcn)
591 {
592 HD_TAR *hd;
593 int len;
594 uintmax_t mtime;
595 char hdblk[sizeof(HD_TAR)];
596
597 /*
598 * check for those file system types which tar cannot store
599 */
600 switch(arcn->type) {
601 case PAX_DIR:
602 /*
603 * user asked that dirs not be written to the archive
604 */
605 if (tar_nodir)
606 return 1;
607 break;
608 case PAX_CHR:
609 tty_warn(1, "Tar cannot archive a character device %s",
610 arcn->org_name);
611 return 1;
612 case PAX_BLK:
613 tty_warn(1,
614 "Tar cannot archive a block device %s", arcn->org_name);
615 return 1;
616 case PAX_SCK:
617 tty_warn(1, "Tar cannot archive a socket %s", arcn->org_name);
618 return 1;
619 case PAX_FIF:
620 tty_warn(1, "Tar cannot archive a fifo %s", arcn->org_name);
621 return 1;
622 case PAX_SLK:
623 case PAX_HLK:
624 case PAX_HRG:
625 if (arcn->ln_nlen > (int)sizeof(hd->linkname)) {
626 tty_warn(1,"Link name too long for tar %s",
627 arcn->ln_name);
628 return 1;
629 }
630 break;
631 case PAX_REG:
632 case PAX_CTG:
633 default:
634 break;
635 }
636
637 /*
638 * check file name len, remember extra char for dirs (the / at the end)
639 */
640 len = arcn->nlen;
641 if (arcn->type == PAX_DIR)
642 ++len;
643 if (len >= (int)sizeof(hd->name)) {
644 tty_warn(1, "File name too long for tar %s", arcn->name);
645 return 1;
646 }
647
648 /*
649 * copy the data out of the ARCHD into the tar header based on the type
650 * of the file. Remember many tar readers want the unused fields to be
651 * padded with zero. We set the linkflag field (type), the linkname
652 * (or zero if not used),the size, and set the padding (if any) to be
653 * added after the file data (0 for all other types, as they only have
654 * a header)
655 */
656 memset(hdblk, 0, sizeof(hdblk));
657 hd = (HD_TAR *)hdblk;
658 strlcpy(hd->name, arcn->name, sizeof(hd->name));
659 arcn->pad = 0;
660
661 if (arcn->type == PAX_DIR) {
662 /*
663 * directories are the same as files, except have a filename
664 * that ends with a /, we add the slash here. No data follows,
665 * dirs, so no pad.
666 */
667 hd->linkflag = AREGTYPE;
668 hd->name[len-1] = '/';
669 if (u32_oct((uintmax_t)0L, hd->size, sizeof(hd->size), 1))
670 goto out;
671 } else if (arcn->type == PAX_SLK) {
672 /*
673 * no data follows this file, so no pad
674 */
675 hd->linkflag = SYMTYPE;
676 strlcpy(hd->linkname, arcn->ln_name, sizeof(hd->linkname));
677 if (u32_oct((uintmax_t)0L, hd->size, sizeof(hd->size), 1))
678 goto out;
679 } else if ((arcn->type == PAX_HLK) || (arcn->type == PAX_HRG)) {
680 /*
681 * no data follows this file, so no pad
682 */
683 hd->linkflag = LNKTYPE;
684 strlcpy(hd->linkname, arcn->ln_name, sizeof(hd->linkname));
685 if (u32_oct((uintmax_t)0L, hd->size, sizeof(hd->size), 1))
686 goto out;
687 } else {
688 /*
689 * data follows this file, so set the pad
690 */
691 hd->linkflag = AREGTYPE;
692 if (OFFT_OCT(arcn->sb.st_size, hd->size, sizeof(hd->size), 1)) {
693 tty_warn(1,"File is too large for tar %s",
694 arcn->org_name);
695 return 1;
696 }
697 arcn->pad = TAR_PAD(arcn->sb.st_size);
698 }
699
700 /*
701 * copy those fields that are independent of the type
702 */
703 mtime = tst.st_ino ? tst.st_mtime : arcn->sb.st_mtime;
704 if (u32_oct((uintmax_t)arcn->sb.st_mode, hd->mode, sizeof(hd->mode), 0) ||
705 u32_oct((uintmax_t)arcn->sb.st_uid, hd->uid, sizeof(hd->uid), 0) ||
706 u32_oct((uintmax_t)arcn->sb.st_gid, hd->gid, sizeof(hd->gid), 0) ||
707 u32_oct(mtime, hd->mtime, sizeof(hd->mtime), 1))
708 goto out;
709
710 /*
711 * calculate and add the checksum, then write the header. A return of
712 * 0 tells the caller to now write the file data, 1 says no data needs
713 * to be written
714 */
715 if (u32_oct(tar_chksm(hdblk, sizeof(HD_TAR)), hd->chksum,
716 sizeof(hd->chksum), 3))
717 goto out; /* XXX Something's wrong here
718 * because a zero-byte file can
719 * cause this to be done and
720 * yet the resulting warning
721 * seems incorrect */
722
723 if (wr_rdbuf(hdblk, sizeof(HD_TAR)) < 0)
724 return -1;
725 if (wr_skip((off_t)(BLKMULT - sizeof(HD_TAR))) < 0)
726 return -1;
727 if ((arcn->type == PAX_CTG) || (arcn->type == PAX_REG))
728 return 0;
729 return 1;
730
731 out:
732 /*
733 * header field is out of range
734 */
735 tty_warn(1, "Tar header field is too small for %s", arcn->org_name);
736 return 1;
737 }
738
739 /*
740 * Routines for POSIX ustar
741 */
742
743 /*
744 * ustar_strd()
745 * initialization for ustar read
746 * Return:
747 * 0 if ok, -1 otherwise
748 */
749
750 int
ustar_strd(void)751 ustar_strd(void)
752 {
753 return 0;
754 }
755
756 /*
757 * ustar_stwr()
758 * initialization for ustar write
759 * Return:
760 * 0 if ok, -1 otherwise
761 */
762
763 int
ustar_stwr(void)764 ustar_stwr(void)
765 {
766 return 0;
767 }
768
769 /*
770 * ustar_id()
771 * determine if a block given to us is a valid ustar header. We have to
772 * be on the lookout for those pesky blocks of all zeros
773 * Return:
774 * 0 if a ustar header, -1 otherwise
775 */
776
777 int
ustar_id(char * blk,int size)778 ustar_id(char *blk, int size)
779 {
780 HD_USTAR *hd;
781
782 if (size < BLKMULT)
783 return -1;
784 hd = (HD_USTAR *)blk;
785
786 /*
787 * check for block of zeros first, a simple and fast test then check
788 * ustar magic cookie. We should use TMAGLEN, but some USTAR archive
789 * programs are fouled up and create archives missing the \0. Last we
790 * check the checksum. If ok we have to assume it is a valid header.
791 */
792 if (hd->name[0] == '\0')
793 return -1;
794 if (strncmp(hd->magic, TMAGIC, TMAGLEN - 1) != 0)
795 return -1;
796 /* This is GNU tar */
797 if (strncmp(hd->magic, "ustar ", 8) == 0 && !is_gnutar &&
798 !seen_gnu_warning) {
799 seen_gnu_warning = 1;
800 tty_warn(0,
801 "Trying to read GNU tar archive with GNU extensions and end-of-volume checks off");
802 }
803 return check_sum(hd->chksum, sizeof(hd->chksum), blk, BLKMULT, 0);
804 }
805
806 /*
807 * ustar_rd()
808 * extract the values out of block already determined to be a ustar header.
809 * store the values in the ARCHD parameter.
810 * Return:
811 * 0
812 */
813
814 int
ustar_rd(ARCHD * arcn,char * buf)815 ustar_rd(ARCHD *arcn, char *buf)
816 {
817 HD_USTAR *hd;
818 char *dest;
819 int cnt;
820 dev_t devmajor;
821 dev_t devminor;
822
823 /*
824 * we only get proper sized buffers
825 */
826 if (ustar_id(buf, BLKMULT) < 0)
827 return -1;
828
829 memset(arcn, 0, sizeof(*arcn));
830 arcn->org_name = arcn->name;
831 arcn->pat = NULL;
832 arcn->sb.st_nlink = 1;
833 hd = (HD_USTAR *)buf;
834
835 /*
836 * see if the filename is split into two parts. if, so joint the parts.
837 * we copy the prefix first and add a / between the prefix and name.
838 */
839 dest = arcn->name;
840 if (*(hd->prefix) != '\0') {
841 cnt = strlcpy(arcn->name, hd->prefix, sizeof(arcn->name));
842 dest += cnt;
843 *dest++ = '/';
844 cnt++;
845 } else {
846 cnt = 0;
847 }
848
849 if (hd->typeflag != LONGLINKTYPE && hd->typeflag != LONGNAMETYPE) {
850 arcn->nlen = expandname(dest, sizeof(arcn->name) - cnt,
851 &gnu_name_string, &gnu_name_length, hd->name,
852 sizeof(hd->name)) + cnt;
853 arcn->ln_nlen = expandname(arcn->ln_name,
854 sizeof(arcn->ln_name), &gnu_link_string, &gnu_link_length,
855 hd->linkname, sizeof(hd->linkname));
856 }
857
858 /*
859 * follow the spec to the letter. we should only have mode bits, strip
860 * off all other crud we may be passed.
861 */
862 arcn->sb.st_mode = (mode_t)(asc_u32(hd->mode, sizeof(hd->mode), OCT) &
863 0xfff);
864 arcn->sb.st_size = (off_t)ASC_OFFT(hd->size, sizeof(hd->size), OCT);
865 if (arcn->sb.st_size == -1)
866 return -1;
867 arcn->sb.st_mtime = (time_t)(int32_t)asc_u32(hd->mtime, sizeof(hd->mtime), OCT);
868 arcn->sb.st_ctime = arcn->sb.st_atime = arcn->sb.st_mtime;
869
870 /*
871 * If we can find the ascii names for gname and uname in the password
872 * and group files we will use the uid's and gid they bind. Otherwise
873 * we use the uid and gid values stored in the header. (This is what
874 * the posix spec wants).
875 */
876 hd->gname[sizeof(hd->gname) - 1] = '\0';
877 if (gid_from_group(hd->gname, &(arcn->sb.st_gid)) < 0)
878 arcn->sb.st_gid = (gid_t)asc_u32(hd->gid, sizeof(hd->gid), OCT);
879 hd->uname[sizeof(hd->uname) - 1] = '\0';
880 if (uid_from_user(hd->uname, &(arcn->sb.st_uid)) < 0)
881 arcn->sb.st_uid = (uid_t)asc_u32(hd->uid, sizeof(hd->uid), OCT);
882
883 /*
884 * set the defaults, these may be changed depending on the file type
885 */
886 arcn->pad = 0;
887 arcn->skip = 0;
888 arcn->sb.st_rdev = (dev_t)0;
889
890 /*
891 * set the mode and PAX type according to the typeflag in the header
892 */
893 switch(hd->typeflag) {
894 case FIFOTYPE:
895 arcn->type = PAX_FIF;
896 arcn->sb.st_mode |= S_IFIFO;
897 break;
898 case DIRTYPE:
899 arcn->type = PAX_DIR;
900 arcn->sb.st_mode |= S_IFDIR;
901 arcn->sb.st_nlink = 2;
902
903 /*
904 * Some programs that create ustar archives append a '/'
905 * to the pathname for directories. This clearly violates
906 * ustar specs, but we will silently strip it off anyway.
907 */
908 if (arcn->name[arcn->nlen - 1] == '/')
909 arcn->name[--arcn->nlen] = '\0';
910 break;
911 case BLKTYPE:
912 case CHRTYPE:
913 /*
914 * this type requires the rdev field to be set.
915 */
916 if (hd->typeflag == BLKTYPE) {
917 arcn->type = PAX_BLK;
918 arcn->sb.st_mode |= S_IFBLK;
919 } else {
920 arcn->type = PAX_CHR;
921 arcn->sb.st_mode |= S_IFCHR;
922 }
923 devmajor = (dev_t)asc_u32(hd->devmajor,sizeof(hd->devmajor),OCT);
924 devminor = (dev_t)asc_u32(hd->devminor,sizeof(hd->devminor),OCT);
925 arcn->sb.st_rdev = TODEV(devmajor, devminor);
926 break;
927 case SYMTYPE:
928 case LNKTYPE:
929 if (hd->typeflag == SYMTYPE) {
930 arcn->type = PAX_SLK;
931 arcn->sb.st_mode |= S_IFLNK;
932 } else {
933 arcn->type = PAX_HLK;
934 /*
935 * so printing looks better
936 */
937 arcn->sb.st_mode |= S_IFREG;
938 arcn->sb.st_nlink = 2;
939 }
940 break;
941 case LONGLINKTYPE:
942 case LONGNAMETYPE:
943 if (is_gnutar) {
944 /*
945 * GNU long link/file; we tag these here and let the
946 * pax internals deal with it -- too ugly otherwise.
947 */
948 if (hd->typeflag != LONGLINKTYPE)
949 arcn->type = PAX_GLF;
950 else
951 arcn->type = PAX_GLL;
952 arcn->pad = TAR_PAD(arcn->sb.st_size);
953 arcn->skip = arcn->sb.st_size;
954 } else {
955 tty_warn(1, "GNU Long %s found in posix ustar archive.",
956 hd->typeflag == LONGLINKTYPE ? "Link" : "File");
957 }
958 break;
959 case FILEXTYPE:
960 case GLOBXTYPE:
961 tty_warn(0, "%s extended headers posix ustar archive."
962 " Extracting as plain files. Following files might be"
963 " in the wrong directory or have wrong attributes.",
964 hd->typeflag == FILEXTYPE ? "File" : "Global");
965 /*FALLTHROUGH*/
966 case CONTTYPE:
967 case AREGTYPE:
968 case REGTYPE:
969 default:
970 /*
971 * these types have file data that follows. Set the skip and
972 * pad fields.
973 */
974 arcn->type = PAX_REG;
975 arcn->pad = TAR_PAD(arcn->sb.st_size);
976 arcn->skip = arcn->sb.st_size;
977 arcn->sb.st_mode |= S_IFREG;
978 break;
979 }
980 return 0;
981 }
982
983 static int
expandname(char * buf,size_t len,char ** gnu_name,size_t * gnu_length,const char * name,size_t nlen)984 expandname(char *buf, size_t len, char **gnu_name, size_t *gnu_length,
985 const char *name, size_t nlen)
986 {
987 if (*gnu_name) {
988 len = strlcpy(buf, *gnu_name, len);
989 free(*gnu_name);
990 *gnu_name = NULL;
991 *gnu_length = 0;
992 } else {
993 if (len > ++nlen)
994 len = nlen;
995 len = strlcpy(buf, name, len);
996 }
997 return len;
998 }
999
1000 static void
longlink(ARCHD * arcn,int type)1001 longlink(ARCHD *arcn, int type)
1002 {
1003 ARCHD larc;
1004
1005 (void)memset(&larc, 0, sizeof(larc));
1006
1007 larc.type = type;
1008 larc.nlen = strlcpy(larc.name, LONG_LINK, sizeof(larc.name));
1009
1010 switch (type) {
1011 case PAX_GLL:
1012 gnu_hack_string = arcn->ln_name;
1013 gnu_hack_len = arcn->ln_nlen + 1;
1014 break;
1015 case PAX_GLF:
1016 gnu_hack_string = arcn->name;
1017 gnu_hack_len = arcn->nlen + 1;
1018 break;
1019 default:
1020 errx(1, "Invalid type in GNU longlink %d", type);
1021 }
1022
1023 /*
1024 * We need a longlink now.
1025 */
1026 ustar_wr(&larc);
1027 }
1028
1029 /*
1030 * ustar_wr()
1031 * write a ustar header for the file specified in the ARCHD to the archive
1032 * Have to check for file types that cannot be stored and file names that
1033 * are too long. Be careful of the term (last arg) to u32_oct, we only use
1034 * '\0' for the termination character (this is different than picky tar)
1035 * ASSUMED: space after header in header block is zero filled
1036 * Return:
1037 * 0 if file has data to be written after the header, 1 if file has NO
1038 * data to write after the header, -1 if archive write failed
1039 */
1040
1041 static int
size_err(const char * what,ARCHD * arcn)1042 size_err(const char *what, ARCHD *arcn)
1043 {
1044 /*
1045 * header field is out of range
1046 */
1047 tty_warn(1, "Ustar %s header field is too small for %s",
1048 what, arcn->org_name);
1049 return 1;
1050 }
1051
1052 int
ustar_wr(ARCHD * arcn)1053 ustar_wr(ARCHD *arcn)
1054 {
1055 HD_USTAR *hd;
1056 char *pt;
1057 uintmax_t mtime;
1058 char hdblk[sizeof(HD_USTAR)];
1059 const char *user, *group;
1060
1061 switch (arcn->type) {
1062 case PAX_SCK:
1063 /*
1064 * check for those file system types ustar cannot store
1065 */
1066 if (!is_gnutar)
1067 tty_warn(1, "Ustar cannot archive a socket %s",
1068 arcn->org_name);
1069 return 1;
1070
1071 case PAX_SLK:
1072 case PAX_HLK:
1073 case PAX_HRG:
1074 /*
1075 * check the length of the linkname
1076 */
1077 if (arcn->ln_nlen >= (int)sizeof(hd->linkname)) {
1078 if (is_gnutar) {
1079 longlink(arcn, PAX_GLL);
1080 } else {
1081 tty_warn(1, "Link name too long for ustar %s",
1082 arcn->ln_name);
1083 return 1;
1084 }
1085 }
1086 break;
1087 default:
1088 break;
1089 }
1090
1091 /*
1092 * split the path name into prefix and name fields (if needed). if
1093 * pt != arcn->name, the name has to be split
1094 */
1095 if ((pt = name_split(arcn->name, arcn->nlen)) == NULL) {
1096 if (is_gnutar) {
1097 longlink(arcn, PAX_GLF);
1098 pt = arcn->name;
1099 } else {
1100 tty_warn(1, "File name too long for ustar %s",
1101 arcn->name);
1102 return 1;
1103 }
1104 }
1105
1106 /*
1107 * zero out the header so we don't have to worry about zero fill below
1108 */
1109 memset(hdblk, 0, sizeof(hdblk));
1110 hd = (HD_USTAR *)hdblk;
1111 arcn->pad = 0L;
1112
1113 /*
1114 * split the name, or zero out the prefix
1115 */
1116 if (pt != arcn->name) {
1117 /*
1118 * name was split, pt points at the / where the split is to
1119 * occur, we remove the / and copy the first part to the prefix
1120 */
1121 *pt = '\0';
1122 strlcpy(hd->prefix, arcn->name, sizeof(hd->prefix));
1123 *pt++ = '/';
1124 }
1125
1126 /*
1127 * copy the name part. this may be the whole path or the part after
1128 * the prefix
1129 */
1130 strlcpy(hd->name, pt, sizeof(hd->name));
1131
1132 /*
1133 * set the fields in the header that are type dependent
1134 */
1135 switch(arcn->type) {
1136 case PAX_DIR:
1137 hd->typeflag = DIRTYPE;
1138 if (u32_oct((uintmax_t)0L, hd->size, sizeof(hd->size), 3))
1139 return size_err("DIRTYPE", arcn);
1140 break;
1141 case PAX_CHR:
1142 case PAX_BLK:
1143 if (arcn->type == PAX_CHR)
1144 hd->typeflag = CHRTYPE;
1145 else
1146 hd->typeflag = BLKTYPE;
1147 if (u32_oct((uintmax_t)MAJOR(arcn->sb.st_rdev), hd->devmajor,
1148 sizeof(hd->devmajor), 3) ||
1149 u32_oct((uintmax_t)MINOR(arcn->sb.st_rdev), hd->devminor,
1150 sizeof(hd->devminor), 3) ||
1151 u32_oct((uintmax_t)0L, hd->size, sizeof(hd->size), 3))
1152 return size_err("DEVTYPE", arcn);
1153 break;
1154 case PAX_FIF:
1155 hd->typeflag = FIFOTYPE;
1156 if (u32_oct((uintmax_t)0L, hd->size, sizeof(hd->size), 3))
1157 return size_err("FIFOTYPE", arcn);
1158 break;
1159 case PAX_GLL:
1160 case PAX_SLK:
1161 case PAX_HLK:
1162 case PAX_HRG:
1163 if (arcn->type == PAX_SLK)
1164 hd->typeflag = SYMTYPE;
1165 else if (arcn->type == PAX_GLL)
1166 hd->typeflag = LONGLINKTYPE;
1167 else
1168 hd->typeflag = LNKTYPE;
1169 strlcpy(hd->linkname, arcn->ln_name, sizeof(hd->linkname));
1170 if (u32_oct((uintmax_t)gnu_hack_len, hd->size,
1171 sizeof(hd->size), 3))
1172 return size_err("LINKTYPE", arcn);
1173 break;
1174 case PAX_GLF:
1175 case PAX_REG:
1176 case PAX_CTG:
1177 default:
1178 /*
1179 * file data with this type, set the padding
1180 */
1181 if (arcn->type == PAX_GLF) {
1182 hd->typeflag = LONGNAMETYPE;
1183 arcn->pad = TAR_PAD(gnu_hack_len);
1184 if (OFFT_OCT((uint32_t)gnu_hack_len, hd->size,
1185 sizeof(hd->size), 3)) {
1186 tty_warn(1,"File is too long for ustar %s",
1187 arcn->org_name);
1188 return 1;
1189 }
1190 } else {
1191 if (arcn->type == PAX_CTG)
1192 hd->typeflag = CONTTYPE;
1193 else
1194 hd->typeflag = REGTYPE;
1195 arcn->pad = TAR_PAD(arcn->sb.st_size);
1196 if (OFFT_OCT(arcn->sb.st_size, hd->size,
1197 sizeof(hd->size), 3)) {
1198 tty_warn(1,"File is too long for ustar %s",
1199 arcn->org_name);
1200 return 1;
1201 }
1202 }
1203 break;
1204 }
1205
1206 strncpy(hd->magic, TMAGIC, TMAGLEN);
1207 if (is_gnutar)
1208 hd->magic[TMAGLEN - 1] = hd->version[0] = ' ';
1209 else
1210 strncpy(hd->version, TVERSION, TVERSLEN);
1211
1212 /*
1213 * set the remaining fields. Some versions want all 16 bits of mode
1214 * we better humor them (they really do not meet spec though)....
1215 */
1216 if (u32_oct((uintmax_t)arcn->sb.st_mode, hd->mode, sizeof(hd->mode), 3))
1217 return size_err("MODE", arcn);
1218 if (u32_oct((uintmax_t)arcn->sb.st_uid, hd->uid, sizeof(hd->uid), 3))
1219 return size_err("UID", arcn);
1220 if (u32_oct((uintmax_t)arcn->sb.st_gid, hd->gid, sizeof(hd->gid), 3))
1221 return size_err("GID", arcn);
1222 mtime = tst.st_ino ? tst.st_mtime : arcn->sb.st_mtime;
1223 if (u32_oct(mtime, hd->mtime, sizeof(hd->mtime), 3))
1224 return size_err("MTIME", arcn);
1225 user = user_from_uid(arcn->sb.st_uid, 1);
1226 group = group_from_gid(arcn->sb.st_gid, 1);
1227 strncpy(hd->uname, user ? user : "", sizeof(hd->uname));
1228 strncpy(hd->gname, group ? group : "", sizeof(hd->gname));
1229
1230 /*
1231 * calculate and store the checksum write the header to the archive
1232 * return 0 tells the caller to now write the file data, 1 says no data
1233 * needs to be written
1234 */
1235 if (u32_oct(tar_chksm(hdblk, sizeof(HD_USTAR)), hd->chksum,
1236 sizeof(hd->chksum), 3))
1237 return size_err("CHKSUM", arcn);
1238 if (wr_rdbuf(hdblk, sizeof(HD_USTAR)) < 0)
1239 return -1;
1240 if (wr_skip((off_t)(BLKMULT - sizeof(HD_USTAR))) < 0)
1241 return -1;
1242 if (gnu_hack_string) {
1243 int res = wr_rdbuf(gnu_hack_string, gnu_hack_len);
1244 int pad = gnu_hack_len;
1245 gnu_hack_string = NULL;
1246 gnu_hack_len = 0;
1247 if (res < 0)
1248 return -1;
1249 if (wr_skip((off_t)(BLKMULT - (pad % BLKMULT))) < 0)
1250 return -1;
1251 }
1252 if ((arcn->type == PAX_CTG) || (arcn->type == PAX_REG))
1253 return 0;
1254 return 1;
1255 }
1256
1257 /*
1258 * name_split()
1259 * see if the name has to be split for storage in a ustar header. We try
1260 * to fit the entire name in the name field without splitting if we can.
1261 * The split point is always at a /
1262 * Return
1263 * character pointer to split point (always the / that is to be removed
1264 * if the split is not needed, the points is set to the start of the file
1265 * name (it would violate the spec to split there). A NULL is returned if
1266 * the file name is too long
1267 */
1268
1269 static char *
name_split(char * name,int len)1270 name_split(char *name, int len)
1271 {
1272 char *start;
1273
1274 /*
1275 * check to see if the file name is small enough to fit in the name
1276 * field. if so just return a pointer to the name.
1277 */
1278 if (len < TNMSZ)
1279 return name;
1280 /*
1281 * GNU tar does not honor the prefix+name mode if the magic
1282 * is not "ustar\0". So in GNU tar compatibility mode, we don't
1283 * split the filename into prefix+name because we are setting
1284 * the magic to "ustar " as GNU tar does. This of course will
1285 * end up creating a LongLink record in cases where it does not
1286 * really need do, but we are behaving like GNU tar after all.
1287 */
1288 if (is_gnutar || len > (TPFSZ + TNMSZ))
1289 return NULL;
1290
1291 /*
1292 * we start looking at the biggest sized piece that fits in the name
1293 * field. We walk forward looking for a slash to split at. The idea is
1294 * to find the biggest piece to fit in the name field (or the smallest
1295 * prefix we can find) (the -1 is correct the biggest piece would
1296 * include the slash between the two parts that gets thrown away)
1297 */
1298 start = name + len - TNMSZ;
1299 while ((*start != '\0') && (*start != '/'))
1300 ++start;
1301
1302 /*
1303 * if we hit the end of the string, this name cannot be split, so we
1304 * cannot store this file.
1305 */
1306 if (*start == '\0')
1307 return NULL;
1308 len = start - name;
1309
1310 /*
1311 * NOTE: /str where the length of str == TNMSZ cannot be stored under
1312 * the p1003.1-1990 spec for ustar. We could force a prefix of / and
1313 * the file would then expand on extract to //str. The len == 0 below
1314 * makes this special case follow the spec to the letter.
1315 */
1316 if ((len >= TPFSZ) || (len == 0))
1317 return NULL;
1318
1319 /*
1320 * ok have a split point, return it to the caller
1321 */
1322 return start;
1323 }
1324
1325 /*
1326 * convert a glob into a RE, and add it to the list. we convert to
1327 * four different RE's (because we're using BRE's and can't use |
1328 * alternation :-() with this padding:
1329 * .*\/ and $
1330 * .*\/ and \/.*
1331 * ^ and $
1332 * ^ and \/.*
1333 */
1334 static int
tar_gnutar_exclude_one(const char * line,size_t len)1335 tar_gnutar_exclude_one(const char *line, size_t len)
1336 {
1337 /* 2 * buffer len + nul */
1338 char sbuf[MAXPATHLEN * 2 + 1];
1339 /* + / + // + .*""/\/ + \/.* */
1340 char rabuf[MAXPATHLEN * 2 + 1 + 1 + 2 + 4 + 4];
1341 size_t i;
1342 int j = 0;
1343
1344 if (line[len - 1] == '\n')
1345 len--;
1346 for (i = 0; i < len; i++) {
1347 /*
1348 * convert glob to regexp, escaping everything
1349 */
1350 if (line[i] == '*')
1351 sbuf[j++] = '.';
1352 else if (line[i] == '?') {
1353 sbuf[j++] = '.';
1354 continue;
1355 } else if (!isalnum((unsigned char)line[i]) &&
1356 !isblank((unsigned char)line[i]))
1357 sbuf[j++] = '\\';
1358 sbuf[j++] = line[i];
1359 }
1360 sbuf[j] = '\0';
1361 /* don't need the .*\/ ones if we start with /, i guess */
1362 if (line[0] != '/') {
1363 (void)snprintf(rabuf, sizeof rabuf, "/.*\\/%s$//", sbuf);
1364 if (rep_add(rabuf) < 0)
1365 return (-1);
1366 (void)snprintf(rabuf, sizeof rabuf, "/.*\\/%s\\/.*//", sbuf);
1367 if (rep_add(rabuf) < 0)
1368 return (-1);
1369 }
1370
1371 (void)snprintf(rabuf, sizeof rabuf, "/^%s$//", sbuf);
1372 if (rep_add(rabuf) < 0)
1373 return (-1);
1374 (void)snprintf(rabuf, sizeof rabuf, "/^%s\\/.*//", sbuf);
1375 if (rep_add(rabuf) < 0)
1376 return (-1);
1377
1378 return (0);
1379 }
1380
1381 /*
1382 * deal with GNU tar -X/--exclude-from & --exclude switches. basically,
1383 * we go through each line of the file, building a string from the "glob"
1384 * lines in the file into RE lines, of the form `/^RE$//', which we pass
1385 * to rep_add(), which will add a empty replacement (exclusion), for the
1386 * named files.
1387 */
1388 int
tar_gnutar_minus_minus_exclude(const char * path)1389 tar_gnutar_minus_minus_exclude(const char *path)
1390 {
1391 size_t len = strlen(path);
1392
1393 if (len > MAXPATHLEN)
1394 tty_warn(0, "pathname too long: %s", path);
1395
1396 return (tar_gnutar_exclude_one(path, len));
1397 }
1398
1399 int
tar_gnutar_X_compat(const char * path)1400 tar_gnutar_X_compat(const char *path)
1401 {
1402 char *line;
1403 FILE *fp;
1404 int lineno = 0;
1405 size_t len;
1406
1407 if (path[0] == '-' && path[1] == '\0')
1408 fp = stdin;
1409 else {
1410 fp = fopen(path, "r");
1411 if (fp == NULL) {
1412 tty_warn(1, "cannot open %s: %s", path,
1413 strerror(errno));
1414 return -1;
1415 }
1416 }
1417
1418 while ((line = fgetln(fp, &len))) {
1419 lineno++;
1420 if (len > MAXPATHLEN) {
1421 tty_warn(0, "pathname too long, line %d of %s",
1422 lineno, path);
1423 }
1424 if (tar_gnutar_exclude_one(line, len))
1425 return -1;
1426 }
1427 if (fp != stdin)
1428 fclose(fp);
1429 return 0;
1430 }
1431