1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
|
/*-
* Copyright (c) 1992 Keith Muller.
* Copyright (c) 1992, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Keith Muller of the University of California, San Diego.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef lint
#if 0
static char sccsid[] = "@(#)tar.c 8.2 (Berkeley) 4/18/94";
#endif
static const char rcsid[] =
"$FreeBSD$";
#endif /* not lint */
#include <sys/types.h>
#include <sys/time.h>
#include <sys/stat.h>
#include <string.h>
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include "pax.h"
#include "extern.h"
#include "tar.h"
/*
* Routines for reading, writing and header identify of various versions of tar
*/
static u_long tar_chksm __P((register char *, register int));
static char *name_split __P((register char *, register int));
static int ul_oct __P((u_long, register char *, register int, int));
#ifndef NET2_STAT
static int uqd_oct __P((u_quad_t, register char *, register int, int));
#endif
/*
* Routines common to all versions of tar
*/
static int tar_nodir; /* do not write dirs under old tar */
/*
* tar_endwr()
* add the tar trailer of two null blocks
* Return:
* 0 if ok, -1 otherwise (what wr_skip returns)
*/
#ifdef __STDC__
int
tar_endwr(void)
#else
int
tar_endwr()
#endif
{
return(wr_skip((off_t)(NULLCNT*BLKMULT)));
}
/*
* tar_endrd()
* no cleanup needed here, just return size of trailer (for append)
* Return:
* size of trailer (2 * BLKMULT)
*/
#ifdef __STDC__
off_t
tar_endrd(void)
#else
off_t
tar_endrd()
#endif
{
return((off_t)(NULLCNT*BLKMULT));
}
/*
* tar_trail()
* Called to determine if a header block is a valid trailer. We are passed
* the block, the in_sync flag (which tells us we are in resync mode;
* looking for a valid header), and cnt (which starts at zero) which is
* used to count the number of empty blocks we have seen so far.
* Return:
* 0 if a valid trailer, -1 if not a valid trailer, or 1 if the block
* could never contain a header.
*/
#ifdef __STDC__
int
tar_trail(register char *buf, register int in_resync, register int *cnt)
#else
int
tar_trail(buf, in_resync, cnt)
register char *buf;
register int in_resync;
register int *cnt;
#endif
{
register int i;
/*
* look for all zero, trailer is two consecutive blocks of zero
*/
for (i = 0; i < BLKMULT; ++i) {
if (buf[i] != '\0')
break;
}
/*
* if not all zero it is not a trailer, but MIGHT be a header.
*/
if (i != BLKMULT)
return(-1);
/*
* When given a zero block, we must be careful!
* If we are not in resync mode, check for the trailer. Have to watch
* out that we do not mis-identify file data as the trailer, so we do
* NOT try to id a trailer during resync mode. During resync mode we
* might as well throw this block out since a valid header can NEVER be
* a block of all 0 (we must have a valid file name).
*/
if (!in_resync && (++*cnt >= NULLCNT))
return(0);
return(1);
}
/*
* ul_oct()
* convert an unsigned long to an octal string. many oddball field
* termination characters are used by the various versions of tar in the
* different fields. term selects which kind to use. str is BLANK padded
* at the front to len. we are unable to use only one format as many old
* tar readers are very cranky about this.
* Return:
* 0 if the number fit into the string, -1 otherwise
*/
#ifdef __STDC__
static int
ul_oct(u_long val, register char *str, register int len, int term)
#else
static int
ul_oct(val, str, len, term)
u_long val;
register char *str;
register int len;
int term;
#endif
{
register char *pt;
/*
* term selects the appropriate character(s) for the end of the string
*/
pt = str + len - 1;
switch(term) {
case 3:
*pt-- = '\0';
break;
case 2:
*pt-- = ' ';
*pt-- = '\0';
break;
case 1:
*pt-- = ' ';
break;
case 0:
default:
*pt-- = '\0';
*pt-- = ' ';
break;
}
/*
* convert and blank pad if there is space
*/
while (pt >= str) {
*pt-- = '0' + (char)(val & 0x7);
if ((val = val >> 3) == (u_long)0)
break;
}
while (pt >= str)
*pt-- = ' ';
if (val != (u_long)0)
return(-1);
return(0);
}
#ifndef NET2_STAT
/*
* uqd_oct()
* convert an u_quad_t to an octal string. one of many oddball field
* termination characters are used by the various versions of tar in the
* different fields. term selects which kind to use. str is BLANK padded
* at the front to len. we are unable to use only one format as many old
* tar readers are very cranky about this.
* Return:
* 0 if the number fit into the string, -1 otherwise
*/
#ifdef __STDC__
static int
uqd_oct(u_quad_t val, register char *str, register int len, int term)
#else
static int
uqd_oct(val, str, len, term)
u_quad_t val;
register char *str;
register int len;
int term;
#endif
{
register char *pt;
/*
* term selects the appropriate character(s) for the end of the string
*/
pt = str + len - 1;
switch(term) {
case 3:
*pt-- = '\0';
break;
case 2:
*pt-- = ' ';
*pt-- = '\0';
break;
case 1:
*pt-- = ' ';
break;
case 0:
default:
*pt-- = '\0';
*pt-- = ' ';
break;
}
/*
* convert and blank pad if there is space
*/
while (pt >= str) {
*pt-- = '0' + (char)(val & 0x7);
if ((val = val >> 3) == 0)
break;
}
while (pt >= str)
*pt-- = ' ';
if (val != (u_quad_t)0)
return(-1);
return(0);
}
#endif
/*
* tar_chksm()
* calculate the checksum for a tar block counting the checksum field as
* all blanks (BLNKSUM is that value pre-calculated, the sum of 8 blanks).
* NOTE: we use len to short circuit summing 0's on write since we ALWAYS
* pad headers with 0.
* Return:
* unsigned long checksum
*/
#ifdef __STDC__
static u_long
tar_chksm(register char *blk, register int len)
#else
static u_long
tar_chksm(blk, len)
register char *blk;
register int len;
#endif
{
register char *stop;
register char *pt;
u_long chksm = BLNKSUM; /* initial value is checksum field sum */
/*
* add the part of the block before the checksum field
*/
pt = blk;
stop = blk + CHK_OFFSET;
while (pt < stop)
chksm += (u_long)(*pt++ & 0xff);
/*
* move past the checksum field and keep going, spec counts the
* checksum field as the sum of 8 blanks (which is pre-computed as
* BLNKSUM).
* ASSUMED: len is greater than CHK_OFFSET. (len is where our 0 padding
* starts, no point in summing zero's)
*/
pt += CHK_LEN;
stop = blk + len;
while (pt < stop)
chksm += (u_long)(*pt++ & 0xff);
return(chksm);
}
/*
* Routines for old BSD style tar (also made portable to sysV tar)
*/
/*
* tar_id()
* determine if a block given to us is a valid tar header (and not a USTAR
* header). We have to be on the lookout for those pesky blocks of all
* zero's.
* Return:
* 0 if a tar header, -1 otherwise
*/
#ifdef __STDC__
int
tar_id(register char *blk, int size)
#else
int
tar_id(blk, size)
register char *blk;
int size;
#endif
{
register HD_TAR *hd;
register HD_USTAR *uhd;
if (size < BLKMULT)
return(-1);
hd = (HD_TAR *)blk;
uhd = (HD_USTAR *)blk;
/*
* check for block of zero's first, a simple and fast test, then make
* sure this is not a ustar header by looking for the ustar magic
* cookie. We should use TMAGLEN, but some USTAR archive programs are
* wrong and create archives missing the \0. Last we check the
* checksum. If this is ok we have to assume it is a valid header.
*/
if (hd->name[0] == '\0')
return(-1);
if (strncmp(uhd->magic, TMAGIC, TMAGLEN - 1) == 0)
return(-1);
if (asc_ul(hd->chksum,sizeof(hd->chksum),OCT) != tar_chksm(blk,BLKMULT))
return(-1);
return(0);
}
/*
* tar_opt()
* handle tar format specific -o options
* Return:
* 0 if ok -1 otherwise
*/
#ifdef __STDC__
int
tar_opt(void)
#else
int
tar_opt()
#endif
{
OPLIST *opt;
while ((opt = opt_next()) != NULL) {
if (strcmp(opt->name, TAR_OPTION) ||
strcmp(opt->value, TAR_NODIR)) {
paxwarn(1, "Unknown tar format -o option/value pair %s=%s",
opt->name, opt->value);
paxwarn(1,"%s=%s is the only supported tar format option",
TAR_OPTION, TAR_NODIR);
return(-1);
}
/*
* we only support one option, and only when writing
*/
if ((act != APPND) && (act != ARCHIVE)) {
paxwarn(1, "%s=%s is only supported when writing.",
opt->name, opt->value);
return(-1);
}
tar_nodir = 1;
}
return(0);
}
/*
* tar_rd()
* extract the values out of block already determined to be a tar header.
* store the values in the ARCHD parameter.
* Return:
* 0
*/
#ifdef __STDC__
int
tar_rd(register ARCHD *arcn, register char *buf)
#else
int
tar_rd(arcn, buf)
register ARCHD *arcn;
register char *buf;
#endif
{
register HD_TAR *hd;
register char *pt;
/*
* we only get proper sized buffers passed to us
*/
if (tar_id(buf, BLKMULT) < 0)
return(-1);
arcn->org_name = arcn->name;
arcn->sb.st_nlink = 1;
arcn->pat = NULL;
/*
* copy out the name and values in the stat buffer
*/
hd = (HD_TAR *)buf;
arcn->nlen = l_strncpy(arcn->name, hd->name, sizeof(hd->name));
arcn->name[arcn->nlen] = '\0';
arcn->sb.st_mode = (mode_t)(asc_ul(hd->mode,sizeof(hd->mode),OCT) &
0xfff);
arcn->sb.st_uid = (uid_t)asc_ul(hd->uid, sizeof(hd->uid), OCT);
arcn->sb.st_gid = (gid_t)asc_ul(hd->gid, sizeof(hd->gid), OCT);
arcn->sb.st_size = (size_t)asc_ul(hd->size, sizeof(hd->size), OCT);
arcn->sb.st_mtime = (time_t)asc_ul(hd->mtime, sizeof(hd->mtime), OCT);
arcn->sb.st_ctime = arcn->sb.st_atime = arcn->sb.st_mtime;
/*
* have to look at the last character, it may be a '/' and that is used
* to encode this as a directory
*/
pt = &(arcn->name[arcn->nlen - 1]);
arcn->pad = 0;
arcn->skip = 0;
switch(hd->linkflag) {
case SYMTYPE:
/*
* symbolic link, need to get the link name and set the type in
* the st_mode so -v printing will look correct.
*/
arcn->type = PAX_SLK;
arcn->ln_nlen = l_strncpy(arcn->ln_name, hd->linkname,
sizeof(hd->linkname));
arcn->ln_name[arcn->ln_nlen] = '\0';
arcn->sb.st_mode |= S_IFLNK;
break;
case LNKTYPE:
/*
* hard link, need to get the link name, set the type in the
* st_mode and st_nlink so -v printing will look better.
*/
arcn->type = PAX_HLK;
arcn->sb.st_nlink = 2;
arcn->ln_nlen = l_strncpy(arcn->ln_name, hd->linkname,
sizeof(hd->linkname));
arcn->ln_name[arcn->ln_nlen] = '\0';
/*
* no idea of what type this thing really points at, but
* we set something for printing only.
*/
arcn->sb.st_mode |= S_IFREG;
break;
case AREGTYPE:
case REGTYPE:
default:
/*
* If we have a trailing / this is a directory and NOT a file.
*/
arcn->ln_name[0] = '\0';
arcn->ln_nlen = 0;
if (*pt == '/') {
/*
* it is a directory, set the mode for -v printing
*/
arcn->type = PAX_DIR;
arcn->sb.st_mode |= S_IFDIR;
arcn->sb.st_nlink = 2;
} else {
/*
* have a file that will be followed by data. Set the
* skip value to the size field and calculate the size
* of the padding.
*/
arcn->type = PAX_REG;
arcn->sb.st_mode |= S_IFREG;
arcn->pad = TAR_PAD(arcn->sb.st_size);
arcn->skip = arcn->sb.st_size;
}
break;
}
/*
* strip off any trailing slash.
*/
if (*pt == '/') {
*pt = '\0';
--arcn->nlen;
}
return(0);
}
/*
* tar_wr()
* write a tar header for the file specified in the ARCHD to the archive.
* Have to check for file types that cannot be stored and file names that
* are too long. Be careful of the term (last arg) to ul_oct, each field
* of tar has it own spec for the termination character(s).
* ASSUMED: space after header in header block is zero filled
* Return:
* 0 if file has data to be written after the header, 1 if file has NO
* data to write after the header, -1 if archive write failed
*/
#ifdef __STDC__
int
tar_wr(register ARCHD *arcn)
#else
int
tar_wr(arcn)
register ARCHD *arcn;
#endif
{
register HD_TAR *hd;
int len;
char hdblk[sizeof(HD_TAR)];
/*
* check for those file system types which tar cannot store
*/
switch(arcn->type) {
case PAX_DIR:
/*
* user asked that dirs not be written to the archive
*/
if (tar_nodir)
return(1);
break;
case PAX_CHR:
paxwarn(1, "Tar cannot archive a character device %s",
arcn->org_name);
return(1);
case PAX_BLK:
paxwarn(1, "Tar cannot archive a block device %s", arcn->org_name);
return(1);
case PAX_SCK:
paxwarn(1, "Tar cannot archive a socket %s", arcn->org_name);
return(1);
case PAX_FIF:
paxwarn(1, "Tar cannot archive a fifo %s", arcn->org_name);
return(1);
case PAX_SLK:
case PAX_HLK:
case PAX_HRG:
if (arcn->ln_nlen > sizeof(hd->linkname)) {
paxwarn(1,"Link name too long for tar %s", arcn->ln_name);
return(1);
}
break;
case PAX_REG:
case PAX_CTG:
default:
break;
}
/*
* check file name len, remember extra char for dirs (the / at the end)
*/
len = arcn->nlen;
if (arcn->type == PAX_DIR)
++len;
if (len > sizeof(hd->name)) {
paxwarn(1, "File name too long for tar %s", arcn->name);
return(1);
}
/*
* copy the data out of the ARCHD into the tar header based on the type
* of the file. Remember many tar readers want the unused fields to be
* padded with zero. We set the linkflag field (type), the linkname
* (or zero if not used),the size, and set the padding (if any) to be
* added after the file data (0 for all other types, as they only have
* a header)
*/
hd = (HD_TAR *)hdblk;
zf_strncpy(hd->name, arcn->name, sizeof(hd->name));
arcn->pad = 0;
if (arcn->type == PAX_DIR) {
/*
* directories are the same as files, except have a filename
* that ends with a /, we add the slash here. No data follows,
* dirs, so no pad.
*/
hd->linkflag = AREGTYPE;
memset(hd->linkname, 0, sizeof(hd->linkname));
hd->name[len-1] = '/';
if (ul_oct((u_long)0L, hd->size, sizeof(hd->size), 1))
goto out;
} else if (arcn->type == PAX_SLK) {
/*
* no data follows this file, so no pad
*/
hd->linkflag = SYMTYPE;
zf_strncpy(hd->linkname,arcn->ln_name, sizeof(hd->linkname));
if (ul_oct((u_long)0L, hd->size, sizeof(hd->size), 1))
goto out;
} else if ((arcn->type == PAX_HLK) || (arcn->type == PAX_HRG)) {
/*
* no data follows this file, so no pad
*/
hd->linkflag = LNKTYPE;
zf_strncpy(hd->linkname,arcn->ln_name, sizeof(hd->linkname));
if (ul_oct((u_long)0L, hd->size, sizeof(hd->size), 1))
goto out;
} else {
/*
* data follows this file, so set the pad
*/
hd->linkflag = AREGTYPE;
memset(hd->linkname, 0, sizeof(hd->linkname));
# ifdef NET2_STAT
if (ul_oct((u_long)arcn->sb.st_size, hd->size,
sizeof(hd->size), 1)) {
# else
if (uqd_oct((u_quad_t)arcn->sb.st_size, hd->size,
sizeof(hd->size), 1)) {
# endif
paxwarn(1,"File is too large for tar %s", arcn->org_name);
return(1);
}
arcn->pad = TAR_PAD(arcn->sb.st_size);
}
/*
* copy those fields that are independent of the type
*/
if (ul_oct((u_long)arcn->sb.st_mode, hd->mode, sizeof(hd->mode), 0) ||
ul_oct((u_long)arcn->sb.st_uid, hd->uid, sizeof(hd->uid), 0) ||
ul_oct((u_long)arcn->sb.st_gid, hd->gid, sizeof(hd->gid), 0) ||
ul_oct((u_long)arcn->sb.st_mtime, hd->mtime, sizeof(hd->mtime), 1))
goto out;
/*
* calculate and add the checksum, then write the header. A return of
* 0 tells the caller to now write the file data, 1 says no data needs
* to be written
*/
if (ul_oct(tar_chksm(hdblk, sizeof(HD_TAR)), hd->chksum,
sizeof(hd->chksum), 2))
goto out;
if (wr_rdbuf(hdblk, sizeof(HD_TAR)) < 0)
return(-1);
if (wr_skip((off_t)(BLKMULT - sizeof(HD_TAR))) < 0)
return(-1);
if ((arcn->type == PAX_CTG) || (arcn->type == PAX_REG))
return(0);
return(1);
out:
/*
* header field is out of range
*/
paxwarn(1, "Tar header field is too small for %s", arcn->org_name);
return(1);
}
/*
* Routines for POSIX ustar
*/
/*
* ustar_strd()
* initialization for ustar read
* Return:
* 0 if ok, -1 otherwise
*/
#ifdef __STDC__
int
ustar_strd(void)
#else
int
ustar_strd()
#endif
{
if ((usrtb_start() < 0) || (grptb_start() < 0))
return(-1);
return(0);
}
/*
* ustar_stwr()
* initialization for ustar write
* Return:
* 0 if ok, -1 otherwise
*/
#ifdef __STDC__
int
ustar_stwr(void)
#else
int
ustar_stwr()
#endif
{
if ((uidtb_start() < 0) || (gidtb_start() < 0))
return(-1);
return(0);
}
/*
* ustar_id()
* determine if a block given to us is a valid ustar header. We have to
* be on the lookout for those pesky blocks of all zero's
* Return:
* 0 if a ustar header, -1 otherwise
*/
#ifdef __STDC__
int
ustar_id(char *blk, int size)
#else
int
ustar_id(blk, size)
char *blk;
int size;
#endif
{
register HD_USTAR *hd;
if (size < BLKMULT)
return(-1);
hd = (HD_USTAR *)blk;
/*
* check for block of zero's first, a simple and fast test then check
* ustar magic cookie. We should use TMAGLEN, but some USTAR archive
* programs are fouled up and create archives missing the \0. Last we
* check the checksum. If ok we have to assume it is a valid header.
*/
if (hd->name[0] == '\0')
return(-1);
if (strncmp(hd->magic, TMAGIC, TMAGLEN - 1) != 0)
return(-1);
if (asc_ul(hd->chksum,sizeof(hd->chksum),OCT) != tar_chksm(blk,BLKMULT))
return(-1);
return(0);
}
/*
* ustar_rd()
* extract the values out of block already determined to be a ustar header.
* store the values in the ARCHD parameter.
* Return:
* 0
*/
#ifdef __STDC__
int
ustar_rd(register ARCHD *arcn, register char *buf)
#else
int
ustar_rd(arcn, buf)
register ARCHD *arcn;
register char *buf;
#endif
{
register HD_USTAR *hd;
register char *dest;
register int cnt = 0;
dev_t devmajor;
dev_t devminor;
/*
* we only get proper sized buffers
*/
if (ustar_id(buf, BLKMULT) < 0)
return(-1);
arcn->org_name = arcn->name;
arcn->sb.st_nlink = 1;
arcn->pat = NULL;
hd = (HD_USTAR *)buf;
/*
* see if the filename is split into two parts. if, so joint the parts.
* we copy the prefix first and add a / between the prefix and name.
*/
dest = arcn->name;
if (*(hd->prefix) != '\0') {
cnt = l_strncpy(arcn->name, hd->prefix, sizeof(hd->prefix));
dest = arcn->name + arcn->nlen;
*dest++ = '/';
}
arcn->nlen = l_strncpy(dest, hd->name, sizeof(hd->name));
arcn->nlen += cnt;
arcn->name[arcn->nlen] = '\0';
/*
* follow the spec to the letter. we should only have mode bits, strip
* off all other crud we may be passed.
*/
arcn->sb.st_mode = (mode_t)(asc_ul(hd->mode, sizeof(hd->mode), OCT) &
0xfff);
arcn->sb.st_size = (size_t)asc_ul(hd->size, sizeof(hd->size), OCT);
arcn->sb.st_mtime = (time_t)asc_ul(hd->mtime, sizeof(hd->mtime), OCT);
arcn->sb.st_ctime = arcn->sb.st_atime = arcn->sb.st_mtime;
/*
* If we can find the ascii names for gname and uname in the password
* and group files we will use the uid's and gid they bind. Otherwise
* we use the uid and gid values stored in the header. (This is what
* the POSIX spec wants).
*/
hd->gname[sizeof(hd->gname) - 1] = '\0';
if (gid_name(hd->gname, &(arcn->sb.st_gid)) < 0)
arcn->sb.st_gid = (gid_t)asc_ul(hd->gid, sizeof(hd->gid), OCT);
hd->uname[sizeof(hd->uname) - 1] = '\0';
if (uid_name(hd->uname, &(arcn->sb.st_uid)) < 0)
arcn->sb.st_uid = (uid_t)asc_ul(hd->uid, sizeof(hd->uid), OCT);
/*
* set the defaults, these may be changed depending on the file type
*/
arcn->ln_name[0] = '\0';
arcn->ln_nlen = 0;
arcn->pad = 0;
arcn->skip = 0;
arcn->sb.st_rdev = (dev_t)0;
/*
* set the mode and PAX type according to the typeflag in the header
*/
switch(hd->typeflag) {
case FIFOTYPE:
arcn->type = PAX_FIF;
arcn->sb.st_mode |= S_IFIFO;
break;
case DIRTYPE:
arcn->type = PAX_DIR;
arcn->sb.st_mode |= S_IFDIR;
arcn->sb.st_nlink = 2;
/*
* Some programs that create ustar archives append a '/'
* to the pathname for directories. This clearly violates
* ustar specs, but we will silently strip it off anyway.
*/
if (arcn->name[arcn->nlen - 1] == '/')
arcn->name[--arcn->nlen] = '\0';
break;
case BLKTYPE:
case CHRTYPE:
/*
* this type requires the rdev field to be set.
*/
if (hd->typeflag == BLKTYPE) {
arcn->type = PAX_BLK;
arcn->sb.st_mode |= S_IFBLK;
} else {
arcn->type = PAX_CHR;
arcn->sb.st_mode |= S_IFCHR;
}
devmajor = (dev_t)asc_ul(hd->devmajor,sizeof(hd->devmajor),OCT);
devminor = (dev_t)asc_ul(hd->devminor,sizeof(hd->devminor),OCT);
arcn->sb.st_rdev = TODEV(devmajor, devminor);
break;
case SYMTYPE:
case LNKTYPE:
if (hd->typeflag == SYMTYPE) {
arcn->type = PAX_SLK;
arcn->sb.st_mode |= S_IFLNK;
} else {
arcn->type = PAX_HLK;
/*
* so printing looks better
*/
arcn->sb.st_mode |= S_IFREG;
arcn->sb.st_nlink = 2;
}
/*
* copy the link name
*/
arcn->ln_nlen = l_strncpy(arcn->ln_name, hd->linkname,
sizeof(hd->linkname));
arcn->ln_name[arcn->ln_nlen] = '\0';
break;
case CONTTYPE:
case AREGTYPE:
case REGTYPE:
default:
/*
* these types have file data that follows. Set the skip and
* pad fields.
*/
arcn->type = PAX_REG;
arcn->pad = TAR_PAD(arcn->sb.st_size);
arcn->skip = arcn->sb.st_size;
arcn->sb.st_mode |= S_IFREG;
break;
}
return(0);
}
/*
* ustar_wr()
* write a ustar header for the file specified in the ARCHD to the archive
* Have to check for file types that cannot be stored and file names that
* are too long. Be careful of the term (last arg) to ul_oct, we only use
* '\0' for the termination character (this is different than picky tar)
* ASSUMED: space after header in header block is zero filled
* Return:
* 0 if file has data to be written after the header, 1 if file has NO
* data to write after the header, -1 if archive write failed
*/
#ifdef __STDC__
int
ustar_wr(register ARCHD *arcn)
#else
int
ustar_wr(arcn)
register ARCHD *arcn;
#endif
{
register HD_USTAR *hd;
register char *pt;
char hdblk[sizeof(HD_USTAR)];
/*
* check for those file system types ustar cannot store
*/
if (arcn->type == PAX_SCK) {
paxwarn(1, "Ustar cannot archive a socket %s", arcn->org_name);
return(1);
}
/*
* check the length of the linkname
*/
if (((arcn->type == PAX_SLK) || (arcn->type == PAX_HLK) ||
(arcn->type == PAX_HRG)) && (arcn->ln_nlen >= sizeof(hd->linkname))){
paxwarn(1, "Link name too long for ustar %s", arcn->ln_name);
return(1);
}
/*
* split the path name into prefix and name fields (if needed). if
* pt != arcn->name, the name has to be split
*/
if ((pt = name_split(arcn->name, arcn->nlen)) == NULL) {
paxwarn(1, "File name too long for ustar %s", arcn->name);
return(1);
}
hd = (HD_USTAR *)hdblk;
arcn->pad = 0L;
/*
* split the name, or zero out the prefix
*/
if (pt != arcn->name) {
/*
* name was split, pt points at the / where the split is to
* occur, we remove the / and copy the first part to the prefix
*/
*pt = '\0';
zf_strncpy(hd->prefix, arcn->name, sizeof(hd->prefix));
*pt++ = '/';
} else
memset(hd->prefix, 0, sizeof(hd->prefix));
/*
* copy the name part. this may be the whole path or the part after
* the prefix
*/
zf_strncpy(hd->name, pt, sizeof(hd->name));
/*
* set the fields in the header that are type dependent
*/
switch(arcn->type) {
case PAX_DIR:
hd->typeflag = DIRTYPE;
memset(hd->linkname, 0, sizeof(hd->linkname));
memset(hd->devmajor, 0, sizeof(hd->devmajor));
memset(hd->devminor, 0, sizeof(hd->devminor));
if (ul_oct((u_long)0L, hd->size, sizeof(hd->size), 3))
goto out;
break;
case PAX_CHR:
case PAX_BLK:
if (arcn->type == PAX_CHR)
hd->typeflag = CHRTYPE;
else
hd->typeflag = BLKTYPE;
memset(hd->linkname, 0, sizeof(hd->linkname));
if (ul_oct((u_long)MAJOR(arcn->sb.st_rdev), hd->devmajor,
sizeof(hd->devmajor), 3) ||
ul_oct((u_long)MINOR(arcn->sb.st_rdev), hd->devminor,
sizeof(hd->devminor), 3) ||
ul_oct((u_long)0L, hd->size, sizeof(hd->size), 3))
goto out;
break;
case PAX_FIF:
hd->typeflag = FIFOTYPE;
memset(hd->linkname, 0, sizeof(hd->linkname));
memset(hd->devmajor, 0, sizeof(hd->devmajor));
memset(hd->devminor, 0, sizeof(hd->devminor));
if (ul_oct((u_long)0L, hd->size, sizeof(hd->size), 3))
goto out;
break;
case PAX_SLK:
case PAX_HLK:
case PAX_HRG:
if (arcn->type == PAX_SLK)
hd->typeflag = SYMTYPE;
else
hd->typeflag = LNKTYPE;
zf_strncpy(hd->linkname,arcn->ln_name, sizeof(hd->linkname));
memset(hd->devmajor, 0, sizeof(hd->devmajor));
memset(hd->devminor, 0, sizeof(hd->devminor));
if (ul_oct((u_long)0L, hd->size, sizeof(hd->size), 3))
goto out;
break;
case PAX_REG:
case PAX_CTG:
default:
/*
* file data with this type, set the padding
*/
if (arcn->type == PAX_CTG)
hd->typeflag = CONTTYPE;
else
hd->typeflag = REGTYPE;
memset(hd->linkname, 0, sizeof(hd->linkname));
memset(hd->devmajor, 0, sizeof(hd->devmajor));
memset(hd->devminor, 0, sizeof(hd->devminor));
arcn->pad = TAR_PAD(arcn->sb.st_size);
# ifdef NET2_STAT
if (ul_oct((u_long)arcn->sb.st_size, hd->size,
sizeof(hd->size), 3)) {
# else
if (uqd_oct((u_quad_t)arcn->sb.st_size, hd->size,
sizeof(hd->size), 3)) {
# endif
paxwarn(1,"File is too long for ustar %s",arcn->org_name);
return(1);
}
break;
}
zf_strncpy(hd->magic, TMAGIC, TMAGLEN);
zf_strncpy(hd->version, TVERSION, TVERSLEN);
/*
* set the remaining fields. Some versions want all 16 bits of mode
* we better humor them (they really do not meet spec though)....
*/
if (ul_oct((u_long)arcn->sb.st_mode, hd->mode, sizeof(hd->mode), 3) ||
ul_oct((u_long)arcn->sb.st_uid, hd->uid, sizeof(hd->uid), 3) ||
ul_oct((u_long)arcn->sb.st_gid, hd->gid, sizeof(hd->gid), 3) ||
ul_oct((u_long)arcn->sb.st_mtime,hd->mtime,sizeof(hd->mtime),3))
goto out;
zf_strncpy(hd->uname,name_uid(arcn->sb.st_uid, 0),sizeof(hd->uname));
zf_strncpy(hd->gname,name_gid(arcn->sb.st_gid, 0),sizeof(hd->gname));
/*
* calculate and store the checksum write the header to the archive
* return 0 tells the caller to now write the file data, 1 says no data
* needs to be written
*/
if (ul_oct(tar_chksm(hdblk, sizeof(HD_USTAR)), hd->chksum,
sizeof(hd->chksum), 3))
goto out;
if (wr_rdbuf(hdblk, sizeof(HD_USTAR)) < 0)
return(-1);
if (wr_skip((off_t)(BLKMULT - sizeof(HD_USTAR))) < 0)
return(-1);
if ((arcn->type == PAX_CTG) || (arcn->type == PAX_REG))
return(0);
return(1);
out:
/*
* header field is out of range
*/
paxwarn(1, "Ustar header field is too small for %s", arcn->org_name);
return(1);
}
/*
* name_split()
* see if the name has to be split for storage in a ustar header. We try
* to fit the entire name in the name field without splitting if we can.
* The split point is always at a /
* Return
* character pointer to split point (always the / that is to be removed
* if the split is not needed, the points is set to the start of the file
* name (it would violate the spec to split there). A NULL is returned if
* the file name is too long
*/
#ifdef __STDC__
static char *
name_split(register char *name, register int len)
#else
static char *
name_split(name, len)
register char *name;
register int len;
#endif
{
register char *start;
/*
* check to see if the file name is small enough to fit in the name
* field. if so just return a pointer to the name.
*/
if (len <= TNMSZ)
return(name);
if (len > (TPFSZ + TNMSZ))
return(NULL);
/*
* we start looking at the biggest sized piece that fits in the name
* field. We walk forward looking for a slash to split at. The idea is
* to find the biggest piece to fit in the name field (or the smallest
* prefix we can find)
*/
start = name + len - TNMSZ;
while ((*start != '\0') && (*start != '/'))
++start;
/*
* if we hit the end of the string, this name cannot be split, so we
* cannot store this file.
*/
if (*start == '\0')
return(NULL);
len = start - name;
/*
* NOTE: /str where the length of str == TNMSZ can not be stored under
* the p1003.1-1990 spec for ustar. We could force a prefix of / and
* the file would then expand on extract to //str. The len == 0 below
* makes this special case follow the spec to the letter.
*/
if ((len >= TPFSZ) || (len == 0))
return(NULL);
/*
* ok have a split point, return it to the caller
*/
return(start);
}
|