1 /*-
2 * Copyright (c) 2003-2007 Tim Kientzle
3 * Copyright (c) 2011-2012 Michihiro NAKAJIMA
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27 #include "archive_platform.h"
28 __FBSDID("$FreeBSD: head/lib/libarchive/archive_write_set_format_ustar.c 191579 2009-04-27 18:35:03Z kientzle $");
29
30
31 #ifdef HAVE_ERRNO_H
32 #include <errno.h>
33 #endif
34 #include <stdio.h>
35 #ifdef HAVE_STDLIB_H
36 #include <stdlib.h>
37 #endif
38 #ifdef HAVE_STRING_H
39 #include <string.h>
40 #endif
41
42 #include "archive.h"
43 #include "archive_entry.h"
44 #include "archive_entry_locale.h"
45 #include "archive_private.h"
46 #include "archive_write_private.h"
47 #include "archive_write_set_format_private.h"
48
49 struct ustar {
50 uint64_t entry_bytes_remaining;
51 uint64_t entry_padding;
52
53 struct archive_string_conv *opt_sconv;
54 struct archive_string_conv *sconv_default;
55 int init_default_conversion;
56 };
57
58 /*
59 * Define structure of POSIX 'ustar' tar header.
60 */
61 #define USTAR_name_offset 0
62 #define USTAR_name_size 100
63 #define USTAR_mode_offset 100
64 #define USTAR_mode_size 6
65 #define USTAR_mode_max_size 8
66 #define USTAR_uid_offset 108
67 #define USTAR_uid_size 6
68 #define USTAR_uid_max_size 8
69 #define USTAR_gid_offset 116
70 #define USTAR_gid_size 6
71 #define USTAR_gid_max_size 8
72 #define USTAR_size_offset 124
73 #define USTAR_size_size 11
74 #define USTAR_size_max_size 12
75 #define USTAR_mtime_offset 136
76 #define USTAR_mtime_size 11
77 #define USTAR_mtime_max_size 11
78 #define USTAR_checksum_offset 148
79 #define USTAR_checksum_size 8
80 #define USTAR_typeflag_offset 156
81 #define USTAR_typeflag_size 1
82 #define USTAR_linkname_offset 157
83 #define USTAR_linkname_size 100
84 #define USTAR_magic_offset 257
85 #define USTAR_magic_size 6
86 #define USTAR_version_offset 263
87 #define USTAR_version_size 2
88 #define USTAR_uname_offset 265
89 #define USTAR_uname_size 32
90 #define USTAR_gname_offset 297
91 #define USTAR_gname_size 32
92 #define USTAR_rdevmajor_offset 329
93 #define USTAR_rdevmajor_size 6
94 #define USTAR_rdevmajor_max_size 8
95 #define USTAR_rdevminor_offset 337
96 #define USTAR_rdevminor_size 6
97 #define USTAR_rdevminor_max_size 8
98 #define USTAR_prefix_offset 345
99 #define USTAR_prefix_size 155
100 #define USTAR_padding_offset 500
101 #define USTAR_padding_size 12
102
103 /*
104 * A filled-in copy of the header for initialization.
105 */
106 static const char template_header[] = {
107 /* name: 100 bytes */
108 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,
109 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,
110 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,
111 0,0,0,0,
112 /* Mode, space-null termination: 8 bytes */
113 '0','0','0','0','0','0', ' ','\0',
114 /* uid, space-null termination: 8 bytes */
115 '0','0','0','0','0','0', ' ','\0',
116 /* gid, space-null termination: 8 bytes */
117 '0','0','0','0','0','0', ' ','\0',
118 /* size, space termination: 12 bytes */
119 '0','0','0','0','0','0','0','0','0','0','0', ' ',
120 /* mtime, space termination: 12 bytes */
121 '0','0','0','0','0','0','0','0','0','0','0', ' ',
122 /* Initial checksum value: 8 spaces */
123 ' ',' ',' ',' ',' ',' ',' ',' ',
124 /* Typeflag: 1 byte */
125 '0', /* '0' = regular file */
126 /* Linkname: 100 bytes */
127 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,
128 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,
129 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,
130 0,0,0,0,
131 /* Magic: 6 bytes, Version: 2 bytes */
132 'u','s','t','a','r','\0', '0','0',
133 /* Uname: 32 bytes */
134 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,
135 /* Gname: 32 bytes */
136 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,
137 /* rdevmajor + space/null padding: 8 bytes */
138 '0','0','0','0','0','0', ' ','\0',
139 /* rdevminor + space/null padding: 8 bytes */
140 '0','0','0','0','0','0', ' ','\0',
141 /* Prefix: 155 bytes */
142 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,
143 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,
144 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,
145 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,
146 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,
147 /* Padding: 12 bytes */
148 0,0,0,0,0,0,0,0, 0,0,0,0
149 };
150
151 static ssize_t archive_write_ustar_data(struct archive_write *a, const void *buff,
152 size_t s);
153 static int archive_write_ustar_free(struct archive_write *);
154 static int archive_write_ustar_close(struct archive_write *);
155 static int archive_write_ustar_finish_entry(struct archive_write *);
156 static int archive_write_ustar_header(struct archive_write *,
157 struct archive_entry *entry);
158 static int archive_write_ustar_options(struct archive_write *,
159 const char *, const char *);
160 static int format_256(int64_t, char *, int);
161 static int format_number(int64_t, char *, int size, int max, int strict);
162 static int format_octal(int64_t, char *, int);
163
164 /*
165 * Set output format to 'ustar' format.
166 */
167 int
archive_write_set_format_ustar(struct archive * _a)168 archive_write_set_format_ustar(struct archive *_a)
169 {
170 struct archive_write *a = (struct archive_write *)_a;
171 struct ustar *ustar;
172
173 archive_check_magic(_a, ARCHIVE_WRITE_MAGIC,
174 ARCHIVE_STATE_NEW, "archive_write_set_format_ustar");
175
176 /* If someone else was already registered, unregister them. */
177 if (a->format_free != NULL)
178 (a->format_free)(a);
179
180 /* Basic internal sanity test. */
181 if (sizeof(template_header) != 512) {
182 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
183 "Internal: template_header wrong size: %zu should be 512",
184 sizeof(template_header));
185 return (ARCHIVE_FATAL);
186 }
187
188 ustar = (struct ustar *)calloc(1, sizeof(*ustar));
189 if (ustar == NULL) {
190 archive_set_error(&a->archive, ENOMEM,
191 "Can't allocate ustar data");
192 return (ARCHIVE_FATAL);
193 }
194 a->format_data = ustar;
195 a->format_name = "ustar";
196 a->format_options = archive_write_ustar_options;
197 a->format_write_header = archive_write_ustar_header;
198 a->format_write_data = archive_write_ustar_data;
199 a->format_close = archive_write_ustar_close;
200 a->format_free = archive_write_ustar_free;
201 a->format_finish_entry = archive_write_ustar_finish_entry;
202 a->archive.archive_format = ARCHIVE_FORMAT_TAR_USTAR;
203 a->archive.archive_format_name = "POSIX ustar";
204 return (ARCHIVE_OK);
205 }
206
207 static int
archive_write_ustar_options(struct archive_write * a,const char * key,const char * val)208 archive_write_ustar_options(struct archive_write *a, const char *key,
209 const char *val)
210 {
211 struct ustar *ustar = (struct ustar *)a->format_data;
212 int ret = ARCHIVE_FAILED;
213
214 if (strcmp(key, "hdrcharset") == 0) {
215 if (val == NULL || val[0] == 0)
216 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
217 "%s: hdrcharset option needs a character-set name",
218 a->format_name);
219 else {
220 ustar->opt_sconv = archive_string_conversion_to_charset(
221 &a->archive, val, 0);
222 if (ustar->opt_sconv != NULL)
223 ret = ARCHIVE_OK;
224 else
225 ret = ARCHIVE_FATAL;
226 }
227 return (ret);
228 }
229
230 /* Note: The "warn" return is just to inform the options
231 * supervisor that we didn't handle it. It will generate
232 * a suitable error if no one used this option. */
233 return (ARCHIVE_WARN);
234 }
235
236 static int
archive_write_ustar_header(struct archive_write * a,struct archive_entry * entry)237 archive_write_ustar_header(struct archive_write *a, struct archive_entry *entry)
238 {
239 char buff[512];
240 int ret, ret2;
241 struct ustar *ustar;
242 struct archive_entry *entry_main;
243 struct archive_string_conv *sconv;
244
245 ustar = (struct ustar *)a->format_data;
246
247 /* Setup default string conversion. */
248 if (ustar->opt_sconv == NULL) {
249 if (!ustar->init_default_conversion) {
250 ustar->sconv_default =
251 archive_string_default_conversion_for_write(&(a->archive));
252 ustar->init_default_conversion = 1;
253 }
254 sconv = ustar->sconv_default;
255 } else
256 sconv = ustar->opt_sconv;
257
258 /* Sanity check. */
259 if (archive_entry_pathname(entry) == NULL) {
260 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
261 "Can't record entry in tar file without pathname");
262 return (ARCHIVE_FAILED);
263 }
264
265 /* Only regular files (not hardlinks) have data. */
266 if (archive_entry_hardlink(entry) != NULL ||
267 archive_entry_symlink(entry) != NULL ||
268 !(archive_entry_filetype(entry) == AE_IFREG))
269 archive_entry_set_size(entry, 0);
270
271 if (AE_IFDIR == archive_entry_filetype(entry)) {
272 const char *p;
273 size_t path_length;
274 /*
275 * Ensure a trailing '/'. Modify the entry so
276 * the client sees the change.
277 */
278 #if defined(_WIN32) && !defined(__CYGWIN__)
279 const wchar_t *wp;
280
281 wp = archive_entry_pathname_w(entry);
282 if (wp != NULL && wp[wcslen(wp) -1] != L'/') {
283 struct archive_wstring ws;
284
285 archive_string_init(&ws);
286 path_length = wcslen(wp);
287 if (archive_wstring_ensure(&ws,
288 path_length + 2) == NULL) {
289 archive_set_error(&a->archive, ENOMEM,
290 "Can't allocate ustar data");
291 archive_wstring_free(&ws);
292 return(ARCHIVE_FATAL);
293 }
294 /* Should we keep '\' ? */
295 if (wp[path_length -1] == L'\\')
296 path_length--;
297 archive_wstrncpy(&ws, wp, path_length);
298 archive_wstrappend_wchar(&ws, L'/');
299 archive_entry_copy_pathname_w(entry, ws.s);
300 archive_wstring_free(&ws);
301 p = NULL;
302 } else
303 #endif
304 p = archive_entry_pathname(entry);
305 /*
306 * On Windows, this is a backup operation just in
307 * case getting WCS failed. On POSIX, this is a
308 * normal operation.
309 */
310 if (p != NULL && p[0] != '\0' && p[strlen(p) - 1] != '/') {
311 struct archive_string as;
312
313 archive_string_init(&as);
314 path_length = strlen(p);
315 if (archive_string_ensure(&as,
316 path_length + 2) == NULL) {
317 archive_set_error(&a->archive, ENOMEM,
318 "Can't allocate ustar data");
319 archive_string_free(&as);
320 return(ARCHIVE_FATAL);
321 }
322 #if defined(_WIN32) && !defined(__CYGWIN__)
323 /* NOTE: This might break the pathname
324 * if the current code page is CP932 and
325 * the pathname includes a character '\'
326 * as a part of its multibyte pathname. */
327 if (p[strlen(p) -1] == '\\')
328 path_length--;
329 else
330 #endif
331 archive_strncpy(&as, p, path_length);
332 archive_strappend_char(&as, '/');
333 archive_entry_copy_pathname(entry, as.s);
334 archive_string_free(&as);
335 }
336 }
337
338 #if defined(_WIN32) && !defined(__CYGWIN__)
339 /* Make sure the path separators in pathname, hardlink and symlink
340 * are all slash '/', not the Windows path separator '\'. */
341 entry_main = __la_win_entry_in_posix_pathseparator(entry);
342 if (entry_main == NULL) {
343 archive_set_error(&a->archive, ENOMEM,
344 "Can't allocate ustar data");
345 return(ARCHIVE_FATAL);
346 }
347 if (entry != entry_main)
348 entry = entry_main;
349 else
350 entry_main = NULL;
351 #else
352 entry_main = NULL;
353 #endif
354 ret = __archive_write_format_header_ustar(a, buff, entry, -1, 1, sconv);
355 if (ret < ARCHIVE_WARN) {
356 archive_entry_free(entry_main);
357 return (ret);
358 }
359 ret2 = __archive_write_output(a, buff, 512);
360 if (ret2 < ARCHIVE_WARN) {
361 archive_entry_free(entry_main);
362 return (ret2);
363 }
364 if (ret2 < ret)
365 ret = ret2;
366
367 ustar->entry_bytes_remaining = archive_entry_size(entry);
368 ustar->entry_padding = 0x1ff & (-(int64_t)ustar->entry_bytes_remaining);
369 archive_entry_free(entry_main);
370 return (ret);
371 }
372
373 /*
374 * Format a basic 512-byte "ustar" header.
375 *
376 * Returns -1 if format failed (due to field overflow).
377 * Note that this always formats as much of the header as possible.
378 * If "strict" is set to zero, it will extend numeric fields as
379 * necessary (overwriting terminators or using base-256 extensions).
380 *
381 * This is exported so that other 'tar' formats can use it.
382 */
383 int
__archive_write_format_header_ustar(struct archive_write * a,char h[512],struct archive_entry * entry,int tartype,int strict,struct archive_string_conv * sconv)384 __archive_write_format_header_ustar(struct archive_write *a, char h[512],
385 struct archive_entry *entry, int tartype, int strict,
386 struct archive_string_conv *sconv)
387 {
388 unsigned int checksum;
389 int i, r, ret;
390 size_t copy_length;
391 const char *p, *pp;
392 int mytartype;
393
394 ret = 0;
395 mytartype = -1;
396 /*
397 * The "template header" already includes the "ustar"
398 * signature, various end-of-field markers and other required
399 * elements.
400 */
401 memcpy(h, &template_header, 512);
402
403 /*
404 * Because the block is already null-filled, and strings
405 * are allowed to exactly fill their destination (without null),
406 * I use memcpy(dest, src, strlen()) here a lot to copy strings.
407 */
408 r = archive_entry_pathname_l(entry, &pp, ©_length, sconv);
409 if (r != 0) {
410 if (errno == ENOMEM) {
411 archive_set_error(&a->archive, ENOMEM,
412 "Can't allocate memory for Pathname");
413 return (ARCHIVE_FATAL);
414 }
415 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
416 "Can't translate pathname '%s' to %s",
417 pp, archive_string_conversion_charset_name(sconv));
418 ret = ARCHIVE_WARN;
419 }
420 if (copy_length <= USTAR_name_size)
421 memcpy(h + USTAR_name_offset, pp, copy_length);
422 else {
423 /* Store in two pieces, splitting at a '/'. */
424 p = strchr(pp + copy_length - USTAR_name_size - 1, '/');
425 /*
426 * Look for the next '/' if we chose the first character
427 * as the separator. (ustar format doesn't permit
428 * an empty prefix.)
429 */
430 if (p == pp)
431 p = strchr(p + 1, '/');
432 /* Fail if the name won't fit. */
433 if (!p) {
434 /* No separator. */
435 archive_set_error(&a->archive, ENAMETOOLONG,
436 "Pathname too long");
437 ret = ARCHIVE_FAILED;
438 } else if (p[1] == '\0') {
439 /*
440 * The only feasible separator is a final '/';
441 * this would result in a non-empty prefix and
442 * an empty name, which POSIX doesn't
443 * explicitly forbid, but it just feels wrong.
444 */
445 archive_set_error(&a->archive, ENAMETOOLONG,
446 "Pathname too long");
447 ret = ARCHIVE_FAILED;
448 } else if (p > pp + USTAR_prefix_size) {
449 /* Prefix is too long. */
450 archive_set_error(&a->archive, ENAMETOOLONG,
451 "Pathname too long");
452 ret = ARCHIVE_FAILED;
453 } else {
454 /* Copy prefix and remainder to appropriate places */
455 memcpy(h + USTAR_prefix_offset, pp, p - pp);
456 memcpy(h + USTAR_name_offset, p + 1,
457 pp + copy_length - p - 1);
458 }
459 }
460
461 r = archive_entry_hardlink_l(entry, &p, ©_length, sconv);
462 if (r != 0) {
463 if (errno == ENOMEM) {
464 archive_set_error(&a->archive, ENOMEM,
465 "Can't allocate memory for Linkname");
466 return (ARCHIVE_FATAL);
467 }
468 archive_set_error(&a->archive,
469 ARCHIVE_ERRNO_FILE_FORMAT,
470 "Can't translate linkname '%s' to %s",
471 p, archive_string_conversion_charset_name(sconv));
472 ret = ARCHIVE_WARN;
473 }
474 if (copy_length > 0)
475 mytartype = '1';
476 else {
477 r = archive_entry_symlink_l(entry, &p, ©_length, sconv);
478 if (r != 0) {
479 if (errno == ENOMEM) {
480 archive_set_error(&a->archive, ENOMEM,
481 "Can't allocate memory for Linkname");
482 return (ARCHIVE_FATAL);
483 }
484 archive_set_error(&a->archive,
485 ARCHIVE_ERRNO_FILE_FORMAT,
486 "Can't translate linkname '%s' to %s",
487 p, archive_string_conversion_charset_name(sconv));
488 ret = ARCHIVE_WARN;
489 }
490 }
491 if (copy_length > 0) {
492 if (copy_length > USTAR_linkname_size) {
493 archive_set_error(&a->archive, ENAMETOOLONG,
494 "Link contents too long");
495 ret = ARCHIVE_FAILED;
496 copy_length = USTAR_linkname_size;
497 }
498 memcpy(h + USTAR_linkname_offset, p, copy_length);
499 }
500
501 r = archive_entry_uname_l(entry, &p, ©_length, sconv);
502 if (r != 0) {
503 if (errno == ENOMEM) {
504 archive_set_error(&a->archive, ENOMEM,
505 "Can't allocate memory for Uname");
506 return (ARCHIVE_FATAL);
507 }
508 archive_set_error(&a->archive,
509 ARCHIVE_ERRNO_FILE_FORMAT,
510 "Can't translate uname '%s' to %s",
511 p, archive_string_conversion_charset_name(sconv));
512 ret = ARCHIVE_WARN;
513 }
514 if (copy_length > 0) {
515 if (copy_length > USTAR_uname_size) {
516 if (tartype != 'x') {
517 archive_set_error(&a->archive,
518 ARCHIVE_ERRNO_MISC, "Username too long");
519 ret = ARCHIVE_FAILED;
520 }
521 copy_length = USTAR_uname_size;
522 }
523 memcpy(h + USTAR_uname_offset, p, copy_length);
524 }
525
526 r = archive_entry_gname_l(entry, &p, ©_length, sconv);
527 if (r != 0) {
528 if (errno == ENOMEM) {
529 archive_set_error(&a->archive, ENOMEM,
530 "Can't allocate memory for Gname");
531 return (ARCHIVE_FATAL);
532 }
533 archive_set_error(&a->archive,
534 ARCHIVE_ERRNO_FILE_FORMAT,
535 "Can't translate gname '%s' to %s",
536 p, archive_string_conversion_charset_name(sconv));
537 ret = ARCHIVE_WARN;
538 }
539 if (copy_length > 0) {
540 if (strlen(p) > USTAR_gname_size) {
541 if (tartype != 'x') {
542 archive_set_error(&a->archive,
543 ARCHIVE_ERRNO_MISC, "Group name too long");
544 ret = ARCHIVE_FAILED;
545 }
546 copy_length = USTAR_gname_size;
547 }
548 memcpy(h + USTAR_gname_offset, p, copy_length);
549 }
550
551 if (format_number(archive_entry_mode(entry) & 07777,
552 h + USTAR_mode_offset, USTAR_mode_size, USTAR_mode_max_size, strict)) {
553 archive_set_error(&a->archive, ERANGE,
554 "Numeric mode too large");
555 ret = ARCHIVE_FAILED;
556 }
557
558 if (format_number(archive_entry_uid(entry),
559 h + USTAR_uid_offset, USTAR_uid_size, USTAR_uid_max_size, strict)) {
560 archive_set_error(&a->archive, ERANGE,
561 "Numeric user ID too large");
562 ret = ARCHIVE_FAILED;
563 }
564
565 if (format_number(archive_entry_gid(entry),
566 h + USTAR_gid_offset, USTAR_gid_size, USTAR_gid_max_size, strict)) {
567 archive_set_error(&a->archive, ERANGE,
568 "Numeric group ID too large");
569 ret = ARCHIVE_FAILED;
570 }
571
572 if (format_number(archive_entry_size(entry),
573 h + USTAR_size_offset, USTAR_size_size, USTAR_size_max_size, strict)) {
574 archive_set_error(&a->archive, ERANGE,
575 "File size out of range");
576 ret = ARCHIVE_FAILED;
577 }
578
579 if (format_number(archive_entry_mtime(entry),
580 h + USTAR_mtime_offset, USTAR_mtime_size, USTAR_mtime_max_size, strict)) {
581 archive_set_error(&a->archive, ERANGE,
582 "File modification time too large");
583 ret = ARCHIVE_FAILED;
584 }
585
586 if (archive_entry_filetype(entry) == AE_IFBLK
587 || archive_entry_filetype(entry) == AE_IFCHR) {
588 if (format_number(archive_entry_rdevmajor(entry),
589 h + USTAR_rdevmajor_offset, USTAR_rdevmajor_size,
590 USTAR_rdevmajor_max_size, strict)) {
591 archive_set_error(&a->archive, ERANGE,
592 "Major device number too large");
593 ret = ARCHIVE_FAILED;
594 }
595
596 if (format_number(archive_entry_rdevminor(entry),
597 h + USTAR_rdevminor_offset, USTAR_rdevminor_size,
598 USTAR_rdevminor_max_size, strict)) {
599 archive_set_error(&a->archive, ERANGE,
600 "Minor device number too large");
601 ret = ARCHIVE_FAILED;
602 }
603 }
604
605 if (tartype >= 0) {
606 h[USTAR_typeflag_offset] = tartype;
607 } else if (mytartype >= 0) {
608 h[USTAR_typeflag_offset] = mytartype;
609 } else {
610 switch (archive_entry_filetype(entry)) {
611 case AE_IFREG: h[USTAR_typeflag_offset] = '0' ; break;
612 case AE_IFLNK: h[USTAR_typeflag_offset] = '2' ; break;
613 case AE_IFCHR: h[USTAR_typeflag_offset] = '3' ; break;
614 case AE_IFBLK: h[USTAR_typeflag_offset] = '4' ; break;
615 case AE_IFDIR: h[USTAR_typeflag_offset] = '5' ; break;
616 case AE_IFIFO: h[USTAR_typeflag_offset] = '6' ; break;
617 default: /* AE_IFSOCK and unknown */
618 __archive_write_entry_filetype_unsupported(
619 &a->archive, entry, "ustar");
620 ret = ARCHIVE_FAILED;
621 }
622 }
623
624 checksum = 0;
625 for (i = 0; i < 512; i++)
626 checksum += 255 & (unsigned int)h[i];
627 h[USTAR_checksum_offset + 6] = '\0'; /* Can't be pre-set in the template. */
628 /* h[USTAR_checksum_offset + 7] = ' '; */ /* This is pre-set in the template. */
629 format_octal(checksum, h + USTAR_checksum_offset, 6);
630 return (ret);
631 }
632
633 /*
634 * Format a number into a field, with some intelligence.
635 */
636 static int
format_number(int64_t v,char * p,int s,int maxsize,int strict)637 format_number(int64_t v, char *p, int s, int maxsize, int strict)
638 {
639 int64_t limit;
640
641 limit = ((int64_t)1 << (s*3));
642
643 /* "Strict" only permits octal values with proper termination. */
644 if (strict)
645 return (format_octal(v, p, s));
646
647 /*
648 * In non-strict mode, we allow the number to overwrite one or
649 * more bytes of the field termination. Even old tar
650 * implementations should be able to handle this with no
651 * problem.
652 */
653 if (v >= 0) {
654 while (s <= maxsize) {
655 if (v < limit)
656 return (format_octal(v, p, s));
657 s++;
658 limit <<= 3;
659 }
660 }
661
662 /* Base-256 can handle any number, positive or negative. */
663 return (format_256(v, p, maxsize));
664 }
665
666 /*
667 * Format a number into the specified field using base-256.
668 */
669 static int
format_256(int64_t v,char * p,int s)670 format_256(int64_t v, char *p, int s)
671 {
672 p += s;
673 while (s-- > 0) {
674 *--p = (char)(v & 0xff);
675 v >>= 8;
676 }
677 *p |= 0x80; /* Set the base-256 marker bit. */
678 return (0);
679 }
680
681 /*
682 * Format a number into the specified field.
683 */
684 static int
format_octal(int64_t v,char * p,int s)685 format_octal(int64_t v, char *p, int s)
686 {
687 int len;
688
689 len = s;
690
691 /* Octal values can't be negative, so use 0. */
692 if (v < 0) {
693 while (len-- > 0)
694 *p++ = '0';
695 return (-1);
696 }
697
698 p += s; /* Start at the end and work backwards. */
699 while (s-- > 0) {
700 *--p = (char)('0' + (v & 7));
701 v >>= 3;
702 }
703
704 if (v == 0)
705 return (0);
706
707 /* If it overflowed, fill field with max value. */
708 while (len-- > 0)
709 *p++ = '7';
710
711 return (-1);
712 }
713
714 static int
archive_write_ustar_close(struct archive_write * a)715 archive_write_ustar_close(struct archive_write *a)
716 {
717 return (__archive_write_nulls(a, 512*2));
718 }
719
720 static int
archive_write_ustar_free(struct archive_write * a)721 archive_write_ustar_free(struct archive_write *a)
722 {
723 struct ustar *ustar;
724
725 ustar = (struct ustar *)a->format_data;
726 free(ustar);
727 a->format_data = NULL;
728 return (ARCHIVE_OK);
729 }
730
731 static int
archive_write_ustar_finish_entry(struct archive_write * a)732 archive_write_ustar_finish_entry(struct archive_write *a)
733 {
734 struct ustar *ustar;
735 int ret;
736
737 ustar = (struct ustar *)a->format_data;
738 ret = __archive_write_nulls(a,
739 (size_t)(ustar->entry_bytes_remaining + ustar->entry_padding));
740 ustar->entry_bytes_remaining = ustar->entry_padding = 0;
741 return (ret);
742 }
743
744 static ssize_t
archive_write_ustar_data(struct archive_write * a,const void * buff,size_t s)745 archive_write_ustar_data(struct archive_write *a, const void *buff, size_t s)
746 {
747 struct ustar *ustar;
748 int ret;
749
750 ustar = (struct ustar *)a->format_data;
751 if (s > ustar->entry_bytes_remaining)
752 s = (size_t)ustar->entry_bytes_remaining;
753 ret = __archive_write_output(a, buff, s);
754 ustar->entry_bytes_remaining -= s;
755 if (ret != ARCHIVE_OK)
756 return (ret);
757 return (s);
758 }
759