1 /*-
2 * Copyright (c) 1992 Keith Muller.
3 * Copyright (c) 1992, 1993
4 * The Regents of the University of California. All rights reserved.
5 *
6 * This code is derived from software contributed to Berkeley by
7 * Keith Muller of the University of California, San Diego.
8 *
9 * %sccs.include.redist.c%
10 */
11
12 #ifndef lint
13 static char sccsid[] = "@(#)tar.c 8.2 (Berkeley) 04/18/94";
14 #endif /* not lint */
15
16 #include <sys/types.h>
17 #include <sys/time.h>
18 #include <sys/stat.h>
19 #include <sys/param.h>
20 #include <string.h>
21 #include <stdio.h>
22 #include <ctype.h>
23 #include <unistd.h>
24 #include <stdlib.h>
25 #include "pax.h"
26 #include "extern.h"
27 #include "tar.h"
28
29 /*
30 * Routines for reading, writing and header identify of various versions of tar
31 */
32
33 static u_long tar_chksm __P((register char *, register int));
34 static char *name_split __P((register char *, register int));
35 static int ul_oct __P((u_long, register char *, register int, int));
36 #ifndef NET2_STAT
37 static int uqd_oct __P((u_quad_t, register char *, register int, int));
38 #endif
39
40 /*
41 * Routines common to all versions of tar
42 */
43
44 static int tar_nodir; /* do not write dirs under old tar */
45
46 /*
47 * tar_endwr()
48 * add the tar trailer of two null blocks
49 * Return:
50 * 0 if ok, -1 otherwise (what wr_skip returns)
51 */
52
53 #if __STDC__
54 int
tar_endwr(void)55 tar_endwr(void)
56 #else
57 int
58 tar_endwr()
59 #endif
60 {
61 return(wr_skip((off_t)(NULLCNT*BLKMULT)));
62 }
63
64 /*
65 * tar_endrd()
66 * no cleanup needed here, just return size of trailer (for append)
67 * Return:
68 * size of trailer (2 * BLKMULT)
69 */
70
71 #if __STDC__
72 off_t
tar_endrd(void)73 tar_endrd(void)
74 #else
75 off_t
76 tar_endrd()
77 #endif
78 {
79 return((off_t)(NULLCNT*BLKMULT));
80 }
81
82 /*
83 * tar_trail()
84 * Called to determine if a header block is a valid trailer. We are passed
85 * the block, the in_sync flag (which tells us we are in resync mode;
86 * looking for a valid header), and cnt (which starts at zero) which is
87 * used to count the number of empty blocks we have seen so far.
88 * Return:
89 * 0 if a valid trailer, -1 if not a valid trailer, or 1 if the block
90 * could never contain a header.
91 */
92
93 #if __STDC__
94 int
tar_trail(register char * buf,register int in_resync,register int * cnt)95 tar_trail(register char *buf, register int in_resync, register int *cnt)
96 #else
97 int
98 tar_trail(buf, in_resync, cnt)
99 register char *buf;
100 register int in_resync;
101 register int *cnt;
102 #endif
103 {
104 register int i;
105
106 /*
107 * look for all zero, trailer is two consecutive blocks of zero
108 */
109 for (i = 0; i < BLKMULT; ++i) {
110 if (buf[i] != '\0')
111 break;
112 }
113
114 /*
115 * if not all zero it is not a trailer, but MIGHT be a header.
116 */
117 if (i != BLKMULT)
118 return(-1);
119
120 /*
121 * When given a zero block, we must be careful!
122 * If we are not in resync mode, check for the trailer. Have to watch
123 * out that we do not mis-identify file data as the trailer, so we do
124 * NOT try to id a trailer during resync mode. During resync mode we
125 * might as well throw this block out since a valid header can NEVER be
126 * a block of all 0 (we must have a valid file name).
127 */
128 if (!in_resync && (++*cnt >= NULLCNT))
129 return(0);
130 return(1);
131 }
132
133 /*
134 * ul_oct()
135 * convert an unsigned long to an octal string. many oddball field
136 * termination characters are used by the various versions of tar in the
137 * different fields. term selects which kind to use. str is BLANK padded
138 * at the front to len. we are unable to use only one format as many old
139 * tar readers are very cranky about this.
140 * Return:
141 * 0 if the number fit into the string, -1 otherwise
142 */
143
144 #if __STDC__
145 static int
ul_oct(u_long val,register char * str,register int len,int term)146 ul_oct(u_long val, register char *str, register int len, int term)
147 #else
148 static int
149 ul_oct(val, str, len, term)
150 u_long val;
151 register char *str;
152 register int len;
153 int term;
154 #endif
155 {
156 register char *pt;
157
158 /*
159 * term selects the appropriate character(s) for the end of the string
160 */
161 pt = str + len - 1;
162 switch(term) {
163 case 3:
164 *pt-- = '\0';
165 break;
166 case 2:
167 *pt-- = ' ';
168 *pt-- = '\0';
169 break;
170 case 1:
171 *pt-- = ' ';
172 break;
173 case 0:
174 default:
175 *pt-- = '\0';
176 *pt-- = ' ';
177 break;
178 }
179
180 /*
181 * convert and blank pad if there is space
182 */
183 while (pt >= str) {
184 *pt-- = '0' + (char)(val & 0x7);
185 if ((val = val >> 3) == (u_long)0)
186 break;
187 }
188
189 while (pt >= str)
190 *pt-- = ' ';
191 if (val != (u_long)0)
192 return(-1);
193 return(0);
194 }
195
196 #ifndef NET2_STAT
197 /*
198 * uqd_oct()
199 * convert an u_quad_t to an octal string. one of many oddball field
200 * termination characters are used by the various versions of tar in the
201 * different fields. term selects which kind to use. str is BLANK padded
202 * at the front to len. we are unable to use only one format as many old
203 * tar readers are very cranky about this.
204 * Return:
205 * 0 if the number fit into the string, -1 otherwise
206 */
207
208 #if __STDC__
209 static int
uqd_oct(u_quad_t val,register char * str,register int len,int term)210 uqd_oct(u_quad_t val, register char *str, register int len, int term)
211 #else
212 static int
213 uqd_oct(val, str, len, term)
214 u_quad_t val;
215 register char *str;
216 register int len;
217 int term;
218 #endif
219 {
220 register char *pt;
221
222 /*
223 * term selects the appropriate character(s) for the end of the string
224 */
225 pt = str + len - 1;
226 switch(term) {
227 case 3:
228 *pt-- = '\0';
229 break;
230 case 2:
231 *pt-- = ' ';
232 *pt-- = '\0';
233 break;
234 case 1:
235 *pt-- = ' ';
236 break;
237 case 0:
238 default:
239 *pt-- = '\0';
240 *pt-- = ' ';
241 break;
242 }
243
244 /*
245 * convert and blank pad if there is space
246 */
247 while (pt >= str) {
248 *pt-- = '0' + (char)(val & 0x7);
249 if ((val = val >> 3) == 0)
250 break;
251 }
252
253 while (pt >= str)
254 *pt-- = ' ';
255 if (val != (u_quad_t)0)
256 return(-1);
257 return(0);
258 }
259 #endif
260
261 /*
262 * tar_chksm()
263 * calculate the checksum for a tar block counting the checksum field as
264 * all blanks (BLNKSUM is that value pre-calculated, the sume of 8 blanks).
265 * NOTE: we use len to short circuit summing 0's on write since we ALWAYS
266 * pad headers with 0.
267 * Return:
268 * unsigned long checksum
269 */
270
271 #if __STDC__
272 static u_long
tar_chksm(register char * blk,register int len)273 tar_chksm(register char *blk, register int len)
274 #else
275 static u_long
276 tar_chksm(blk, len)
277 register char *blk;
278 register int len;
279 #endif
280 {
281 register char *stop;
282 register char *pt;
283 u_long chksm = BLNKSUM; /* inital value is checksum field sum */
284
285 /*
286 * add the part of the block before the checksum field
287 */
288 pt = blk;
289 stop = blk + CHK_OFFSET;
290 while (pt < stop)
291 chksm += (u_long)(*pt++ & 0xff);
292 /*
293 * move past the checksum field and keep going, spec counts the
294 * checksum field as the sum of 8 blanks (which is pre-computed as
295 * BLNKSUM).
296 * ASSUMED: len is greater than CHK_OFFSET. (len is where our 0 padding
297 * starts, no point in summing zero's)
298 */
299 pt += CHK_LEN;
300 stop = blk + len;
301 while (pt < stop)
302 chksm += (u_long)(*pt++ & 0xff);
303 return(chksm);
304 }
305
306 /*
307 * Routines for old BSD style tar (also made portable to sysV tar)
308 */
309
310 /*
311 * tar_id()
312 * determine if a block given to us is a valid tar header (and not a USTAR
313 * header). We have to be on the lookout for those pesky blocks of all
314 * zero's.
315 * Return:
316 * 0 if a tar header, -1 otherwise
317 */
318
319 #if __STDC__
320 int
tar_id(register char * blk,int size)321 tar_id(register char *blk, int size)
322 #else
323 int
324 tar_id(blk, size)
325 register char *blk;
326 int size;
327 #endif
328 {
329 register HD_TAR *hd;
330 register HD_USTAR *uhd;
331
332 if (size < BLKMULT)
333 return(-1);
334 hd = (HD_TAR *)blk;
335 uhd = (HD_USTAR *)blk;
336
337 /*
338 * check for block of zero's first, a simple and fast test, then make
339 * sure this is not a ustar header by looking for the ustar magic
340 * cookie. We should use TMAGLEN, but some USTAR archive programs are
341 * wrong and create archives missing the \0. Last we check the
342 * checksum. If this is ok we have to assume it is a valid header.
343 */
344 if (hd->name[0] == '\0')
345 return(-1);
346 if (strncmp(uhd->magic, TMAGIC, TMAGLEN - 1) == 0)
347 return(-1);
348 if (asc_ul(hd->chksum,sizeof(hd->chksum),OCT) != tar_chksm(blk,BLKMULT))
349 return(-1);
350 return(0);
351 }
352
353 /*
354 * tar_opt()
355 * handle tar format specific -o options
356 * Return:
357 * 0 if ok -1 otherwise
358 */
359
360 #if __STDC__
361 int
tar_opt(void)362 tar_opt(void)
363 #else
364 int
365 tar_opt()
366 #endif
367 {
368 OPLIST *opt;
369
370 while ((opt = opt_next()) != NULL) {
371 if (strcmp(opt->name, TAR_OPTION) ||
372 strcmp(opt->value, TAR_NODIR)) {
373 warn(1, "Unknown tar format -o option/value pair %s=%s",
374 opt->name, opt->value);
375 warn(1,"%s=%s is the only supported tar format option",
376 TAR_OPTION, TAR_NODIR);
377 return(-1);
378 }
379
380 /*
381 * we only support one option, and only when writing
382 */
383 if ((act != APPND) && (act != ARCHIVE)) {
384 warn(1, "%s=%s is only supported when writing.",
385 opt->name, opt->value);
386 return(-1);
387 }
388 tar_nodir = 1;
389 }
390 return(0);
391 }
392
393
394 /*
395 * tar_rd()
396 * extract the values out of block already determined to be a tar header.
397 * store the values in the ARCHD parameter.
398 * Return:
399 * 0
400 */
401
402 #if __STDC__
403 int
tar_rd(register ARCHD * arcn,register char * buf)404 tar_rd(register ARCHD *arcn, register char *buf)
405 #else
406 int
407 tar_rd(arcn, buf)
408 register ARCHD *arcn;
409 register char *buf;
410 #endif
411 {
412 register HD_TAR *hd;
413 register char *pt;
414
415 /*
416 * we only get proper sized buffers passed to us
417 */
418 if (tar_id(buf, BLKMULT) < 0)
419 return(-1);
420 arcn->org_name = arcn->name;
421 arcn->sb.st_nlink = 1;
422 arcn->pat = NULL;
423
424 /*
425 * copy out the name and values in the stat buffer
426 */
427 hd = (HD_TAR *)buf;
428 arcn->nlen = l_strncpy(arcn->name, hd->name, sizeof(hd->name));
429 arcn->name[arcn->nlen] = '\0';
430 arcn->sb.st_mode = (mode_t)(asc_ul(hd->mode,sizeof(hd->mode),OCT) &
431 0xfff);
432 arcn->sb.st_uid = (uid_t)asc_ul(hd->uid, sizeof(hd->uid), OCT);
433 arcn->sb.st_gid = (gid_t)asc_ul(hd->gid, sizeof(hd->gid), OCT);
434 arcn->sb.st_size = (size_t)asc_ul(hd->size, sizeof(hd->size), OCT);
435 arcn->sb.st_mtime = (time_t)asc_ul(hd->mtime, sizeof(hd->mtime), OCT);
436 arcn->sb.st_ctime = arcn->sb.st_atime = arcn->sb.st_mtime;
437
438 /*
439 * have to look at the last character, it may be a '/' and that is used
440 * to encode this as a directory
441 */
442 pt = &(arcn->name[arcn->nlen - 1]);
443 arcn->pad = 0;
444 arcn->skip = 0;
445 switch(hd->linkflag) {
446 case SYMTYPE:
447 /*
448 * symbolic link, need to get the link name and set the type in
449 * the st_mode so -v printing will look correct.
450 */
451 arcn->type = PAX_SLK;
452 arcn->ln_nlen = l_strncpy(arcn->ln_name, hd->linkname,
453 sizeof(hd->linkname));
454 arcn->ln_name[arcn->ln_nlen] = '\0';
455 arcn->sb.st_mode |= S_IFLNK;
456 break;
457 case LNKTYPE:
458 /*
459 * hard link, need to get the link name, set the type in the
460 * st_mode and st_nlink so -v printing will look better.
461 */
462 arcn->type = PAX_HLK;
463 arcn->sb.st_nlink = 2;
464 arcn->ln_nlen = l_strncpy(arcn->ln_name, hd->linkname,
465 sizeof(hd->linkname));
466 arcn->ln_name[arcn->ln_nlen] = '\0';
467
468 /*
469 * no idea of what type this thing really points at, but
470 * we set something for printing only.
471 */
472 arcn->sb.st_mode |= S_IFREG;
473 break;
474 case AREGTYPE:
475 case REGTYPE:
476 default:
477 /*
478 * If we have a trailing / this is a directory and NOT a file.
479 */
480 arcn->ln_name[0] = '\0';
481 arcn->ln_nlen = 0;
482 if (*pt == '/') {
483 /*
484 * it is a directory, set the mode for -v printing
485 */
486 arcn->type = PAX_DIR;
487 arcn->sb.st_mode |= S_IFDIR;
488 arcn->sb.st_nlink = 2;
489 } else {
490 /*
491 * have a file that will be followed by data. Set the
492 * skip value to the size field and caluculate the size
493 * of the padding.
494 */
495 arcn->type = PAX_REG;
496 arcn->sb.st_mode |= S_IFREG;
497 arcn->pad = TAR_PAD(arcn->sb.st_size);
498 arcn->skip = arcn->sb.st_size;
499 }
500 break;
501 }
502
503 /*
504 * strip off any trailing slash.
505 */
506 if (*pt == '/') {
507 *pt = '\0';
508 --arcn->nlen;
509 }
510 return(0);
511 }
512
513 /*
514 * tar_wr()
515 * write a tar header for the file specified in the ARCHD to the archive.
516 * Have to check for file types that cannot be stored and file names that
517 * are too long. Be careful of the term (last arg) to ul_oct, each field
518 * of tar has it own spec for the termination character(s).
519 * ASSUMED: space after header in header block is zero filled
520 * Return:
521 * 0 if file has data to be written after the header, 1 if file has NO
522 * data to write after the header, -1 if archive write failed
523 */
524
525 #if __STDC__
526 int
tar_wr(register ARCHD * arcn)527 tar_wr(register ARCHD *arcn)
528 #else
529 int
530 tar_wr(arcn)
531 register ARCHD *arcn;
532 #endif
533 {
534 register HD_TAR *hd;
535 int len;
536 char hdblk[sizeof(HD_TAR)];
537
538 /*
539 * check for those file system types which tar cannot store
540 */
541 switch(arcn->type) {
542 case PAX_DIR:
543 /*
544 * user asked that dirs not be written to the archive
545 */
546 if (tar_nodir)
547 return(1);
548 break;
549 case PAX_CHR:
550 warn(1, "Tar cannot archive a character device %s",
551 arcn->org_name);
552 return(1);
553 case PAX_BLK:
554 warn(1, "Tar cannot archive a block device %s", arcn->org_name);
555 return(1);
556 case PAX_SCK:
557 warn(1, "Tar cannot archive a socket %s", arcn->org_name);
558 return(1);
559 case PAX_FIF:
560 warn(1, "Tar cannot archive a fifo %s", arcn->org_name);
561 return(1);
562 case PAX_SLK:
563 case PAX_HLK:
564 case PAX_HRG:
565 if (arcn->ln_nlen > sizeof(hd->linkname)) {
566 warn(1,"Link name too long for tar %s", arcn->ln_name);
567 return(1);
568 }
569 break;
570 case PAX_REG:
571 case PAX_CTG:
572 default:
573 break;
574 }
575
576 /*
577 * check file name len, remember extra char for dirs (the / at the end)
578 */
579 len = arcn->nlen;
580 if (arcn->type == PAX_DIR)
581 ++len;
582 if (len > sizeof(hd->name)) {
583 warn(1, "File name too long for tar %s", arcn->name);
584 return(1);
585 }
586
587 /*
588 * copy the data out of the ARCHD into the tar header based on the type
589 * of the file. Remember many tar readers want the unused fields to be
590 * padded with zero. We set the linkflag field (type), the linkname
591 * (or zero if not used),the size, and set the padding (if any) to be
592 * added after the file data (0 for all other types, as they only have
593 * a header)
594 */
595 hd = (HD_TAR *)hdblk;
596 zf_strncpy(hd->name, arcn->name, sizeof(hd->name));
597 arcn->pad = 0;
598
599 if (arcn->type == PAX_DIR) {
600 /*
601 * directories are the same as files, except have a filename
602 * that ends with a /, we add the slash here. No data follows,
603 * dirs, so no pad.
604 */
605 hd->linkflag = AREGTYPE;
606 bzero(hd->linkname, sizeof(hd->linkname));
607 hd->name[len-1] = '/';
608 if (ul_oct((u_long)0L, hd->size, sizeof(hd->size), 1))
609 goto out;
610 } else if (arcn->type == PAX_SLK) {
611 /*
612 * no data follows this file, so no pad
613 */
614 hd->linkflag = SYMTYPE;
615 zf_strncpy(hd->linkname,arcn->ln_name, sizeof(hd->linkname));
616 if (ul_oct((u_long)0L, hd->size, sizeof(hd->size), 1))
617 goto out;
618 } else if ((arcn->type == PAX_HLK) || (arcn->type == PAX_HRG)) {
619 /*
620 * no data follows this file, so no pad
621 */
622 hd->linkflag = LNKTYPE;
623 zf_strncpy(hd->linkname,arcn->ln_name, sizeof(hd->linkname));
624 if (ul_oct((u_long)0L, hd->size, sizeof(hd->size), 1))
625 goto out;
626 } else {
627 /*
628 * data follows this file, so set the pad
629 */
630 hd->linkflag = AREGTYPE;
631 bzero(hd->linkname, sizeof(hd->linkname));
632 # ifdef NET2_STAT
633 if (ul_oct((u_long)arcn->sb.st_size, hd->size,
634 sizeof(hd->size), 1)) {
635 # else
636 if (uqd_oct((u_quad_t)arcn->sb.st_size, hd->size,
637 sizeof(hd->size), 1)) {
638 # endif
639 warn(1,"File is too large for tar %s", arcn->org_name);
640 return(1);
641 }
642 arcn->pad = TAR_PAD(arcn->sb.st_size);
643 }
644
645 /*
646 * copy those fields that are independent of the type
647 */
648 if (ul_oct((u_long)arcn->sb.st_mode, hd->mode, sizeof(hd->mode), 0) ||
649 ul_oct((u_long)arcn->sb.st_uid, hd->uid, sizeof(hd->uid), 0) ||
650 ul_oct((u_long)arcn->sb.st_gid, hd->gid, sizeof(hd->gid), 0) ||
651 ul_oct((u_long)arcn->sb.st_mtime, hd->mtime, sizeof(hd->mtime), 1))
652 goto out;
653
654 /*
655 * calculate and add the checksum, then write the header. A return of
656 * 0 tells the caller to now write the file data, 1 says no data needs
657 * to be written
658 */
659 if (ul_oct(tar_chksm(hdblk, sizeof(HD_TAR)), hd->chksum,
660 sizeof(hd->chksum), 2))
661 goto out;
662 if (wr_rdbuf(hdblk, sizeof(HD_TAR)) < 0)
663 return(-1);
664 if (wr_skip((off_t)(BLKMULT - sizeof(HD_TAR))) < 0)
665 return(-1);
666 if ((arcn->type == PAX_CTG) || (arcn->type == PAX_REG))
667 return(0);
668 return(1);
669
670 out:
671 /*
672 * header field is out of range
673 */
674 warn(1, "Tar header field is too small for %s", arcn->org_name);
675 return(1);
676 }
677
678 /*
679 * Routines for POSIX ustar
680 */
681
682 /*
683 * ustar_strd()
684 * initialization for ustar read
685 * Return:
686 * 0 if ok, -1 otherwise
687 */
688
689 #if __STDC__
690 int
ustar_strd(void)691 ustar_strd(void)
692 #else
693 int
694 ustar_strd()
695 #endif
696 {
697 if ((usrtb_start() < 0) || (grptb_start() < 0))
698 return(-1);
699 return(0);
700 }
701
702 /*
703 * ustar_stwr()
704 * initialization for ustar write
705 * Return:
706 * 0 if ok, -1 otherwise
707 */
708
709 #if __STDC__
710 int
ustar_stwr(void)711 ustar_stwr(void)
712 #else
713 int
714 ustar_stwr()
715 #endif
716 {
717 if ((uidtb_start() < 0) || (gidtb_start() < 0))
718 return(-1);
719 return(0);
720 }
721
722 /*
723 * ustar_id()
724 * determine if a block given to us is a valid ustar header. We have to
725 * be on the lookout for those pesky blocks of all zero's
726 * Return:
727 * 0 if a ustar header, -1 otherwise
728 */
729
730 #if __STDC__
731 int
ustar_id(char * blk,int size)732 ustar_id(char *blk, int size)
733 #else
734 int
735 ustar_id(blk, size)
736 char *blk;
737 int size;
738 #endif
739 {
740 register HD_USTAR *hd;
741
742 if (size < BLKMULT)
743 return(-1);
744 hd = (HD_USTAR *)blk;
745
746 /*
747 * check for block of zero's first, a simple and fast test then check
748 * ustar magic cookie. We should use TMAGLEN, but some USTAR archive
749 * programs are fouled up and create archives missing the \0. Last we
750 * check the checksum. If ok we have to assume it is a valid header.
751 */
752 if (hd->name[0] == '\0')
753 return(-1);
754 if (strncmp(hd->magic, TMAGIC, TMAGLEN - 1) != 0)
755 return(-1);
756 if (asc_ul(hd->chksum,sizeof(hd->chksum),OCT) != tar_chksm(blk,BLKMULT))
757 return(-1);
758 return(0);
759 }
760
761 /*
762 * ustar_rd()
763 * extract the values out of block already determined to be a ustar header.
764 * store the values in the ARCHD parameter.
765 * Return:
766 * 0
767 */
768
769 #if __STDC__
770 int
ustar_rd(register ARCHD * arcn,register char * buf)771 ustar_rd(register ARCHD *arcn, register char *buf)
772 #else
773 int
774 ustar_rd(arcn, buf)
775 register ARCHD *arcn;
776 register char *buf;
777 #endif
778 {
779 register HD_USTAR *hd;
780 register char *dest;
781 register int cnt = 0;
782 dev_t devmajor;
783 dev_t devminor;
784
785 /*
786 * we only get proper sized buffers
787 */
788 if (ustar_id(buf, BLKMULT) < 0)
789 return(-1);
790 arcn->org_name = arcn->name;
791 arcn->sb.st_nlink = 1;
792 arcn->pat = NULL;
793 hd = (HD_USTAR *)buf;
794
795 /*
796 * see if the filename is split into two parts. if, so joint the parts.
797 * we copy the prefix first and add a / between the prefix and name.
798 */
799 dest = arcn->name;
800 if (*(hd->prefix) != '\0') {
801 cnt = l_strncpy(arcn->name, hd->prefix, sizeof(hd->prefix));
802 dest = arcn->name + arcn->nlen;
803 *dest++ = '/';
804 }
805 arcn->nlen = l_strncpy(dest, hd->name, sizeof(hd->name));
806 arcn->nlen += cnt;
807 arcn->name[arcn->nlen] = '\0';
808
809 /*
810 * follow the spec to the letter. we should only have mode bits, strip
811 * off all other crud we may be passed.
812 */
813 arcn->sb.st_mode = (mode_t)(asc_ul(hd->mode, sizeof(hd->mode), OCT) &
814 0xfff);
815 arcn->sb.st_size = (size_t)asc_ul(hd->size, sizeof(hd->size), OCT);
816 arcn->sb.st_mtime = (time_t)asc_ul(hd->mtime, sizeof(hd->mtime), OCT);
817 arcn->sb.st_ctime = arcn->sb.st_atime = arcn->sb.st_mtime;
818
819 /*
820 * If we can find the ascii names for gname and uname in the password
821 * and group files we will use the uid's and gid they bind. Otherwise
822 * we use the uid and gid values stored in the header. (This is what
823 * the posix spec wants).
824 */
825 hd->gname[sizeof(hd->gname) - 1] = '\0';
826 if (gid_name(hd->gname, &(arcn->sb.st_gid)) < 0)
827 arcn->sb.st_gid = (gid_t)asc_ul(hd->gid, sizeof(hd->gid), OCT);
828 hd->uname[sizeof(hd->uname) - 1] = '\0';
829 if (uid_name(hd->uname, &(arcn->sb.st_uid)) < 0)
830 arcn->sb.st_uid = (uid_t)asc_ul(hd->uid, sizeof(hd->uid), OCT);
831
832 /*
833 * set the defaults, these may be changed depending on the file type
834 */
835 arcn->ln_name[0] = '\0';
836 arcn->ln_nlen = 0;
837 arcn->pad = 0;
838 arcn->skip = 0;
839 arcn->sb.st_rdev = (dev_t)0;
840
841 /*
842 * set the mode and PAX type according to the typeflag in the header
843 */
844 switch(hd->typeflag) {
845 case FIFOTYPE:
846 arcn->type = PAX_FIF;
847 arcn->sb.st_mode |= S_IFIFO;
848 break;
849 case DIRTYPE:
850 arcn->type = PAX_DIR;
851 arcn->sb.st_mode |= S_IFDIR;
852 arcn->sb.st_nlink = 2;
853
854 /*
855 * Some programs that create ustar archives append a '/'
856 * to the pathname for directories. This clearly violates
857 * ustar specs, but we will silently strip it off anyway.
858 */
859 if (arcn->name[arcn->nlen - 1] == '/')
860 arcn->name[--arcn->nlen] = '\0';
861 break;
862 case BLKTYPE:
863 case CHRTYPE:
864 /*
865 * this type requires the rdev field to be set.
866 */
867 if (hd->typeflag == BLKTYPE) {
868 arcn->type = PAX_BLK;
869 arcn->sb.st_mode |= S_IFBLK;
870 } else {
871 arcn->type = PAX_CHR;
872 arcn->sb.st_mode |= S_IFCHR;
873 }
874 devmajor = (dev_t)asc_ul(hd->devmajor,sizeof(hd->devmajor),OCT);
875 devminor = (dev_t)asc_ul(hd->devminor,sizeof(hd->devminor),OCT);
876 arcn->sb.st_rdev = TODEV(devmajor, devminor);
877 break;
878 case SYMTYPE:
879 case LNKTYPE:
880 if (hd->typeflag == SYMTYPE) {
881 arcn->type = PAX_SLK;
882 arcn->sb.st_mode |= S_IFLNK;
883 } else {
884 arcn->type = PAX_HLK;
885 /*
886 * so printing looks better
887 */
888 arcn->sb.st_mode |= S_IFREG;
889 arcn->sb.st_nlink = 2;
890 }
891 /*
892 * copy the link name
893 */
894 arcn->ln_nlen = l_strncpy(arcn->ln_name, hd->linkname,
895 sizeof(hd->linkname));
896 arcn->ln_name[arcn->ln_nlen] = '\0';
897 break;
898 case CONTTYPE:
899 case AREGTYPE:
900 case REGTYPE:
901 default:
902 /*
903 * these types have file data that follows. Set the skip and
904 * pad fields.
905 */
906 arcn->type = PAX_REG;
907 arcn->pad = TAR_PAD(arcn->sb.st_size);
908 arcn->skip = arcn->sb.st_size;
909 arcn->sb.st_mode |= S_IFREG;
910 break;
911 }
912 return(0);
913 }
914
915 /*
916 * ustar_wr()
917 * write a ustar header for the file specified in the ARCHD to the archive
918 * Have to check for file types that cannot be stored and file names that
919 * are too long. Be careful of the term (last arg) to ul_oct, we only use
920 * '\0' for the termination character (this is different than picky tar)
921 * ASSUMED: space after header in header block is zero filled
922 * Return:
923 * 0 if file has data to be written after the header, 1 if file has NO
924 * data to write after the header, -1 if archive write failed
925 */
926
927 #if __STDC__
928 int
ustar_wr(register ARCHD * arcn)929 ustar_wr(register ARCHD *arcn)
930 #else
931 int
932 ustar_wr(arcn)
933 register ARCHD *arcn;
934 #endif
935 {
936 register HD_USTAR *hd;
937 register char *pt;
938 char hdblk[sizeof(HD_USTAR)];
939
940 /*
941 * check for those file system types ustar cannot store
942 */
943 if (arcn->type == PAX_SCK) {
944 warn(1, "Ustar cannot archive a socket %s", arcn->org_name);
945 return(1);
946 }
947
948 /*
949 * check the length of the linkname
950 */
951 if (((arcn->type == PAX_SLK) || (arcn->type == PAX_HLK) ||
952 (arcn->type == PAX_HRG)) && (arcn->ln_nlen > sizeof(hd->linkname))){
953 warn(1, "Link name too long for ustar %s", arcn->ln_name);
954 return(1);
955 }
956
957 /*
958 * split the path name into prefix and name fields (if needed). if
959 * pt != arcn->name, the name has to be split
960 */
961 if ((pt = name_split(arcn->name, arcn->nlen)) == NULL) {
962 warn(1, "File name too long for ustar %s", arcn->name);
963 return(1);
964 }
965 hd = (HD_USTAR *)hdblk;
966 arcn->pad = 0L;
967
968 /*
969 * split the name, or zero out the prefix
970 */
971 if (pt != arcn->name) {
972 /*
973 * name was split, pt points at the / where the split is to
974 * occur, we remove the / and copy the first part to the prefix
975 */
976 *pt = '\0';
977 zf_strncpy(hd->prefix, arcn->name, sizeof(hd->prefix));
978 *pt++ = '/';
979 } else
980 bzero(hd->prefix, sizeof(hd->prefix));
981
982 /*
983 * copy the name part. this may be the whole path or the part after
984 * the prefix
985 */
986 zf_strncpy(hd->name, pt, sizeof(hd->name));
987
988 /*
989 * set the fields in the header that are type dependent
990 */
991 switch(arcn->type) {
992 case PAX_DIR:
993 hd->typeflag = DIRTYPE;
994 bzero(hd->linkname, sizeof(hd->linkname));
995 bzero(hd->devmajor, sizeof(hd->devmajor));
996 bzero(hd->devminor, sizeof(hd->devminor));
997 if (ul_oct((u_long)0L, hd->size, sizeof(hd->size), 3))
998 goto out;
999 break;
1000 case PAX_CHR:
1001 case PAX_BLK:
1002 if (arcn->type == PAX_CHR)
1003 hd->typeflag = CHRTYPE;
1004 else
1005 hd->typeflag = BLKTYPE;
1006 bzero(hd->linkname, sizeof(hd->linkname));
1007 if (ul_oct((u_long)MAJOR(arcn->sb.st_rdev), hd->devmajor,
1008 sizeof(hd->devmajor), 3) ||
1009 ul_oct((u_long)MINOR(arcn->sb.st_rdev), hd->devminor,
1010 sizeof(hd->devminor), 3) ||
1011 ul_oct((u_long)0L, hd->size, sizeof(hd->size), 3))
1012 goto out;
1013 break;
1014 case PAX_FIF:
1015 hd->typeflag = FIFOTYPE;
1016 bzero(hd->linkname, sizeof(hd->linkname));
1017 bzero(hd->devmajor, sizeof(hd->devmajor));
1018 bzero(hd->devminor, sizeof(hd->devminor));
1019 if (ul_oct((u_long)0L, hd->size, sizeof(hd->size), 3))
1020 goto out;
1021 break;
1022 case PAX_SLK:
1023 case PAX_HLK:
1024 case PAX_HRG:
1025 if (arcn->type == PAX_SLK)
1026 hd->typeflag = SYMTYPE;
1027 else
1028 hd->typeflag = LNKTYPE;
1029 zf_strncpy(hd->linkname,arcn->ln_name, sizeof(hd->linkname));
1030 bzero(hd->devmajor, sizeof(hd->devmajor));
1031 bzero(hd->devminor, sizeof(hd->devminor));
1032 if (ul_oct((u_long)0L, hd->size, sizeof(hd->size), 3))
1033 goto out;
1034 break;
1035 case PAX_REG:
1036 case PAX_CTG:
1037 default:
1038 /*
1039 * file data with this type, set the padding
1040 */
1041 if (arcn->type == PAX_CTG)
1042 hd->typeflag = CONTTYPE;
1043 else
1044 hd->typeflag = REGTYPE;
1045 bzero(hd->linkname, sizeof(hd->linkname));
1046 bzero(hd->devmajor, sizeof(hd->devmajor));
1047 bzero(hd->devminor, sizeof(hd->devminor));
1048 arcn->pad = TAR_PAD(arcn->sb.st_size);
1049 # ifdef NET2_STAT
1050 if (ul_oct((u_long)arcn->sb.st_size, hd->size,
1051 sizeof(hd->size), 3)) {
1052 # else
1053 if (uqd_oct((u_quad_t)arcn->sb.st_size, hd->size,
1054 sizeof(hd->size), 3)) {
1055 # endif
1056 warn(1,"File is too long for ustar %s",arcn->org_name);
1057 return(1);
1058 }
1059 break;
1060 }
1061
1062 zf_strncpy(hd->magic, TMAGIC, TMAGLEN);
1063 zf_strncpy(hd->version, TVERSION, TVERSLEN);
1064
1065 /*
1066 * set the remaining fields. Some versions want all 16 bits of mode
1067 * we better humor them (they really do not meet spec though)....
1068 */
1069 if (ul_oct((u_long)arcn->sb.st_mode, hd->mode, sizeof(hd->mode), 3) ||
1070 ul_oct((u_long)arcn->sb.st_uid, hd->uid, sizeof(hd->uid), 3) ||
1071 ul_oct((u_long)arcn->sb.st_gid, hd->gid, sizeof(hd->gid), 3) ||
1072 ul_oct((u_long)arcn->sb.st_mtime,hd->mtime,sizeof(hd->mtime),3))
1073 goto out;
1074 zf_strncpy(hd->uname,name_uid(arcn->sb.st_uid, 0),sizeof(hd->uname));
1075 zf_strncpy(hd->gname,name_gid(arcn->sb.st_gid, 0),sizeof(hd->gname));
1076
1077 /*
1078 * calculate and store the checksum write the header to the archive
1079 * return 0 tells the caller to now write the file data, 1 says no data
1080 * needs to be written
1081 */
1082 if (ul_oct(tar_chksm(hdblk, sizeof(HD_USTAR)), hd->chksum,
1083 sizeof(hd->chksum), 3))
1084 goto out;
1085 if (wr_rdbuf(hdblk, sizeof(HD_USTAR)) < 0)
1086 return(-1);
1087 if (wr_skip((off_t)(BLKMULT - sizeof(HD_USTAR))) < 0)
1088 return(-1);
1089 if ((arcn->type == PAX_CTG) || (arcn->type == PAX_REG))
1090 return(0);
1091 return(1);
1092
1093 out:
1094 /*
1095 * header field is out of range
1096 */
1097 warn(1, "Ustar header field is too small for %s", arcn->org_name);
1098 return(1);
1099 }
1100
1101 /*
1102 * name_split()
1103 * see if the name has to be split for storage in a ustar header. We try
1104 * to fit the entire name in the name field without splitting if we can.
1105 * The split point is always at a /
1106 * Return
1107 * character pointer to split point (always the / that is to be removed
1108 * if the split is not needed, the points is set to the start of the file
1109 * name (it would violate the spec to split there). A NULL is returned if
1110 * the file name is too long
1111 */
1112
1113 #if __STDC__
1114 static char *
name_split(register char * name,register int len)1115 name_split(register char *name, register int len)
1116 #else
1117 static char *
1118 name_split(name, len)
1119 register char *name;
1120 register int len;
1121 #endif
1122 {
1123 register char *start;
1124
1125 /*
1126 * check to see if the file name is small enough to fit in the name
1127 * field. if so just return a pointer to the name.
1128 */
1129 if (len <= TNMSZ)
1130 return(name);
1131 if (len > (TPFSZ + TNMSZ + 1))
1132 return(NULL);
1133
1134 /*
1135 * we start looking at the biggest sized piece that fits in the name
1136 * field. We walk foward looking for a slash to split at. The idea is
1137 * to find the biggest piece to fit in the name field (or the smallest
1138 * prefix we can find) (the -1 is correct the biggest piece would
1139 * include the slash between the two parts that gets thrown away)
1140 */
1141 start = name + len - TNMSZ - 1;
1142 while ((*start != '\0') && (*start != '/'))
1143 ++start;
1144
1145 /*
1146 * if we hit the end of the string, this name cannot be split, so we
1147 * cannot store this file.
1148 */
1149 if (*start == '\0')
1150 return(NULL);
1151 len = start - name;
1152
1153 /*
1154 * NOTE: /str where the length of str == TNMSZ can not be stored under
1155 * the p1003.1-1990 spec for ustar. We could force a prefix of / and
1156 * the file would then expand on extract to //str. The len == 0 below
1157 * makes this special case follow the spec to the letter.
1158 */
1159 if ((len > TPFSZ) || (len == 0))
1160 return(NULL);
1161
1162 /*
1163 * ok have a split point, return it to the caller
1164 */
1165 return(start);
1166 }
1167