1 /*-
2 * Copyright (c) 2010 Nokia Corporation and/or its subsidiary(-ies).
3 * Author: Jonas Gastal <[email protected]>
4 * Copyright (c) 2011-2012 Michihiro NAKAJIMA
5 *
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29 #include "archive_platform.h"
30 __FBSDID("$FreeBSD: head/lib/libarchive/archive_write_set_format_gnu_tar.c 191579 2009-04-27 18:35:03Z gastal $");
31
32
33 #ifdef HAVE_ERRNO_H
34 #include <errno.h>
35 #endif
36 #include <stdio.h>
37 #ifdef HAVE_STDLIB_H
38 #include <stdlib.h>
39 #endif
40 #ifdef HAVE_STRING_H
41 #include <string.h>
42 #endif
43
44 #include "archive.h"
45 #include "archive_entry.h"
46 #include "archive_entry_locale.h"
47 #include "archive_private.h"
48 #include "archive_write_private.h"
49
50 struct gnutar {
51 uint64_t entry_bytes_remaining;
52 uint64_t entry_padding;
53 const char * linkname;
54 size_t linkname_length;
55 const char * pathname;
56 size_t pathname_length;
57 const char * uname;
58 size_t uname_length;
59 const char * gname;
60 size_t gname_length;
61 struct archive_string_conv *opt_sconv;
62 struct archive_string_conv *sconv_default;
63 int init_default_conversion;
64 };
65
66 /*
67 * Define structure of GNU tar header.
68 */
69 #define GNUTAR_name_offset 0
70 #define GNUTAR_name_size 100
71 #define GNUTAR_mode_offset 100
72 #define GNUTAR_mode_size 7
73 #define GNUTAR_mode_max_size 8
74 #define GNUTAR_uid_offset 108
75 #define GNUTAR_uid_size 7
76 #define GNUTAR_uid_max_size 8
77 #define GNUTAR_gid_offset 116
78 #define GNUTAR_gid_size 7
79 #define GNUTAR_gid_max_size 8
80 #define GNUTAR_size_offset 124
81 #define GNUTAR_size_size 11
82 #define GNUTAR_size_max_size 12
83 #define GNUTAR_mtime_offset 136
84 #define GNUTAR_mtime_size 11
85 #define GNUTAR_mtime_max_size 11
86 #define GNUTAR_checksum_offset 148
87 #define GNUTAR_checksum_size 8
88 #define GNUTAR_typeflag_offset 156
89 #define GNUTAR_typeflag_size 1
90 #define GNUTAR_linkname_offset 157
91 #define GNUTAR_linkname_size 100
92 #define GNUTAR_magic_offset 257
93 #define GNUTAR_magic_size 6
94 #define GNUTAR_version_offset 263
95 #define GNUTAR_version_size 2
96 #define GNUTAR_uname_offset 265
97 #define GNUTAR_uname_size 32
98 #define GNUTAR_gname_offset 297
99 #define GNUTAR_gname_size 32
100 #define GNUTAR_rdevmajor_offset 329
101 #define GNUTAR_rdevmajor_size 6
102 #define GNUTAR_rdevmajor_max_size 8
103 #define GNUTAR_rdevminor_offset 337
104 #define GNUTAR_rdevminor_size 6
105 #define GNUTAR_rdevminor_max_size 8
106
107 /*
108 * A filled-in copy of the header for initialization.
109 */
110 static const char template_header[] = {
111 /* name: 100 bytes */
112 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,
113 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,
114 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,
115 0,0,0,0,
116 /* Mode, null termination: 8 bytes */
117 '0','0','0','0','0','0', '0','\0',
118 /* uid, null termination: 8 bytes */
119 '0','0','0','0','0','0', '0','\0',
120 /* gid, null termination: 8 bytes */
121 '0','0','0','0','0','0', '0','\0',
122 /* size, space termination: 12 bytes */
123 '0','0','0','0','0','0','0','0','0','0','0', '\0',
124 /* mtime, space termination: 12 bytes */
125 '0','0','0','0','0','0','0','0','0','0','0', '\0',
126 /* Initial checksum value: 8 spaces */
127 ' ',' ',' ',' ',' ',' ',' ',' ',
128 /* Typeflag: 1 byte */
129 '0', /* '0' = regular file */
130 /* Linkname: 100 bytes */
131 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,
132 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,
133 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,
134 0,0,0,0,
135 /* Magic: 8 bytes */
136 'u','s','t','a','r',' ', ' ','\0',
137 /* Uname: 32 bytes */
138 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,
139 /* Gname: 32 bytes */
140 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,
141 /* rdevmajor + null padding: 8 bytes */
142 '\0','\0','\0','\0','\0','\0', '\0','\0',
143 /* rdevminor + null padding: 8 bytes */
144 '\0','\0','\0','\0','\0','\0', '\0','\0',
145 /* Padding: 167 bytes */
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, 0,0,0,0,0,0,0,0,
147 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,
148 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,
149 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,
150 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,
151 0,0,0,0,0,0,0
152 };
153
154 static int archive_write_gnutar_options(struct archive_write *,
155 const char *, const char *);
156 static int archive_format_gnutar_header(struct archive_write *, char h[512],
157 struct archive_entry *, int tartype);
158 static int archive_write_gnutar_header(struct archive_write *,
159 struct archive_entry *entry);
160 static ssize_t archive_write_gnutar_data(struct archive_write *a, const void *buff,
161 size_t s);
162 static int archive_write_gnutar_free(struct archive_write *);
163 static int archive_write_gnutar_close(struct archive_write *);
164 static int archive_write_gnutar_finish_entry(struct archive_write *);
165 static int format_256(int64_t, char *, int);
166 static int format_number(int64_t, char *, int size, int maxsize);
167 static int format_octal(int64_t, char *, int);
168
169 /*
170 * Set output format to 'GNU tar' format.
171 */
172 int
archive_write_set_format_gnutar(struct archive * _a)173 archive_write_set_format_gnutar(struct archive *_a)
174 {
175 struct archive_write *a = (struct archive_write *)_a;
176 struct gnutar *gnutar;
177
178 gnutar = (struct gnutar *)calloc(1, sizeof(*gnutar));
179 if (gnutar == NULL) {
180 archive_set_error(&a->archive, ENOMEM,
181 "Can't allocate gnutar data");
182 return (ARCHIVE_FATAL);
183 }
184 a->format_data = gnutar;
185 a->format_name = "gnutar";
186 a->format_options = archive_write_gnutar_options;
187 a->format_write_header = archive_write_gnutar_header;
188 a->format_write_data = archive_write_gnutar_data;
189 a->format_close = archive_write_gnutar_close;
190 a->format_free = archive_write_gnutar_free;
191 a->format_finish_entry = archive_write_gnutar_finish_entry;
192 a->archive.archive_format = ARCHIVE_FORMAT_TAR_GNUTAR;
193 a->archive.archive_format_name = "GNU tar";
194 return (ARCHIVE_OK);
195 }
196
197 static int
archive_write_gnutar_options(struct archive_write * a,const char * key,const char * val)198 archive_write_gnutar_options(struct archive_write *a, const char *key,
199 const char *val)
200 {
201 struct gnutar *gnutar = (struct gnutar *)a->format_data;
202 int ret = ARCHIVE_FAILED;
203
204 if (strcmp(key, "hdrcharset") == 0) {
205 if (val == NULL || val[0] == 0)
206 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
207 "%s: hdrcharset option needs a character-set name",
208 a->format_name);
209 else {
210 gnutar->opt_sconv = archive_string_conversion_to_charset(
211 &a->archive, val, 0);
212 if (gnutar->opt_sconv != NULL)
213 ret = ARCHIVE_OK;
214 else
215 ret = ARCHIVE_FATAL;
216 }
217 return (ret);
218 }
219
220 /* Note: The "warn" return is just to inform the options
221 * supervisor that we didn't handle it. It will generate
222 * a suitable error if no one used this option. */
223 return (ARCHIVE_WARN);
224 }
225
226 static int
archive_write_gnutar_close(struct archive_write * a)227 archive_write_gnutar_close(struct archive_write *a)
228 {
229 return (__archive_write_nulls(a, 512*2));
230 }
231
232 static int
archive_write_gnutar_free(struct archive_write * a)233 archive_write_gnutar_free(struct archive_write *a)
234 {
235 struct gnutar *gnutar;
236
237 gnutar = (struct gnutar *)a->format_data;
238 free(gnutar);
239 a->format_data = NULL;
240 return (ARCHIVE_OK);
241 }
242
243 static int
archive_write_gnutar_finish_entry(struct archive_write * a)244 archive_write_gnutar_finish_entry(struct archive_write *a)
245 {
246 struct gnutar *gnutar;
247 int ret;
248
249 gnutar = (struct gnutar *)a->format_data;
250 ret = __archive_write_nulls(a, (size_t)
251 (gnutar->entry_bytes_remaining + gnutar->entry_padding));
252 gnutar->entry_bytes_remaining = gnutar->entry_padding = 0;
253 return (ret);
254 }
255
256 static ssize_t
archive_write_gnutar_data(struct archive_write * a,const void * buff,size_t s)257 archive_write_gnutar_data(struct archive_write *a, const void *buff, size_t s)
258 {
259 struct gnutar *gnutar;
260 int ret;
261
262 gnutar = (struct gnutar *)a->format_data;
263 if (s > gnutar->entry_bytes_remaining)
264 s = (size_t)gnutar->entry_bytes_remaining;
265 ret = __archive_write_output(a, buff, s);
266 gnutar->entry_bytes_remaining -= s;
267 if (ret != ARCHIVE_OK)
268 return (ret);
269 return (s);
270 }
271
272 static int
archive_write_gnutar_header(struct archive_write * a,struct archive_entry * entry)273 archive_write_gnutar_header(struct archive_write *a,
274 struct archive_entry *entry)
275 {
276 char buff[512];
277 int r, ret, ret2 = ARCHIVE_OK;
278 int tartype;
279 struct gnutar *gnutar;
280 struct archive_string_conv *sconv;
281 struct archive_entry *entry_main;
282
283 gnutar = (struct gnutar *)a->format_data;
284
285 /* Setup default string conversion. */
286 if (gnutar->opt_sconv == NULL) {
287 if (!gnutar->init_default_conversion) {
288 gnutar->sconv_default =
289 archive_string_default_conversion_for_write(
290 &(a->archive));
291 gnutar->init_default_conversion = 1;
292 }
293 sconv = gnutar->sconv_default;
294 } else
295 sconv = gnutar->opt_sconv;
296
297 /* Only regular files (not hardlinks) have data. */
298 if (archive_entry_hardlink(entry) != NULL ||
299 archive_entry_symlink(entry) != NULL ||
300 !(archive_entry_filetype(entry) == AE_IFREG))
301 archive_entry_set_size(entry, 0);
302
303 if (AE_IFDIR == archive_entry_filetype(entry)) {
304 const char *p;
305 size_t path_length;
306 /*
307 * Ensure a trailing '/'. Modify the entry so
308 * the client sees the change.
309 */
310 #if defined(_WIN32) && !defined(__CYGWIN__)
311 const wchar_t *wp;
312
313 wp = archive_entry_pathname_w(entry);
314 if (wp != NULL && wp[wcslen(wp) -1] != L'/') {
315 struct archive_wstring ws;
316
317 archive_string_init(&ws);
318 path_length = wcslen(wp);
319 if (archive_wstring_ensure(&ws,
320 path_length + 2) == NULL) {
321 archive_set_error(&a->archive, ENOMEM,
322 "Can't allocate ustar data");
323 archive_wstring_free(&ws);
324 return(ARCHIVE_FATAL);
325 }
326 /* Should we keep '\' ? */
327 if (wp[path_length -1] == L'\\')
328 path_length--;
329 archive_wstrncpy(&ws, wp, path_length);
330 archive_wstrappend_wchar(&ws, L'/');
331 archive_entry_copy_pathname_w(entry, ws.s);
332 archive_wstring_free(&ws);
333 p = NULL;
334 } else
335 #endif
336 p = archive_entry_pathname(entry);
337 /*
338 * On Windows, this is a backup operation just in
339 * case getting WCS failed. On POSIX, this is a
340 * normal operation.
341 */
342 if (p != NULL && p[0] != '\0' && p[strlen(p) - 1] != '/') {
343 struct archive_string as;
344
345 archive_string_init(&as);
346 path_length = strlen(p);
347 if (archive_string_ensure(&as,
348 path_length + 2) == NULL) {
349 archive_set_error(&a->archive, ENOMEM,
350 "Can't allocate ustar data");
351 archive_string_free(&as);
352 return(ARCHIVE_FATAL);
353 }
354 #if defined(_WIN32) && !defined(__CYGWIN__)
355 /* NOTE: This might break the pathname
356 * if the current code page is CP932 and
357 * the pathname includes a character '\'
358 * as a part of its multibyte pathname. */
359 if (p[strlen(p) -1] == '\\')
360 path_length--;
361 else
362 #endif
363 archive_strncpy(&as, p, path_length);
364 archive_strappend_char(&as, '/');
365 archive_entry_copy_pathname(entry, as.s);
366 archive_string_free(&as);
367 }
368 }
369
370 #if defined(_WIN32) && !defined(__CYGWIN__)
371 /* Make sure the path separators in pathname, hardlink and symlink
372 * are all slash '/', not the Windows path separator '\'. */
373 entry_main = __la_win_entry_in_posix_pathseparator(entry);
374 if (entry_main == NULL) {
375 archive_set_error(&a->archive, ENOMEM,
376 "Can't allocate ustar data");
377 return(ARCHIVE_FATAL);
378 }
379 if (entry != entry_main)
380 entry = entry_main;
381 else
382 entry_main = NULL;
383 #else
384 entry_main = NULL;
385 #endif
386 r = archive_entry_pathname_l(entry, &(gnutar->pathname),
387 &(gnutar->pathname_length), sconv);
388 if (r != 0) {
389 if (errno == ENOMEM) {
390 archive_set_error(&a->archive, ENOMEM,
391 "Can't allocate memory for Pathame");
392 ret = ARCHIVE_FATAL;
393 goto exit_write_header;
394 }
395 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
396 "Can't translate pathname '%s' to %s",
397 archive_entry_pathname(entry),
398 archive_string_conversion_charset_name(sconv));
399 ret2 = ARCHIVE_WARN;
400 }
401 r = archive_entry_uname_l(entry, &(gnutar->uname),
402 &(gnutar->uname_length), sconv);
403 if (r != 0) {
404 if (errno == ENOMEM) {
405 archive_set_error(&a->archive, ENOMEM,
406 "Can't allocate memory for Uname");
407 ret = ARCHIVE_FATAL;
408 goto exit_write_header;
409 }
410 archive_set_error(&a->archive,
411 ARCHIVE_ERRNO_FILE_FORMAT,
412 "Can't translate uname '%s' to %s",
413 archive_entry_uname(entry),
414 archive_string_conversion_charset_name(sconv));
415 ret2 = ARCHIVE_WARN;
416 }
417 r = archive_entry_gname_l(entry, &(gnutar->gname),
418 &(gnutar->gname_length), sconv);
419 if (r != 0) {
420 if (errno == ENOMEM) {
421 archive_set_error(&a->archive, ENOMEM,
422 "Can't allocate memory for Gname");
423 ret = ARCHIVE_FATAL;
424 goto exit_write_header;
425 }
426 archive_set_error(&a->archive,
427 ARCHIVE_ERRNO_FILE_FORMAT,
428 "Can't translate gname '%s' to %s",
429 archive_entry_gname(entry),
430 archive_string_conversion_charset_name(sconv));
431 ret2 = ARCHIVE_WARN;
432 }
433
434 /* If linkname is longer than 100 chars we need to add a 'K' header. */
435 r = archive_entry_hardlink_l(entry, &(gnutar->linkname),
436 &(gnutar->linkname_length), sconv);
437 if (r != 0) {
438 if (errno == ENOMEM) {
439 archive_set_error(&a->archive, ENOMEM,
440 "Can't allocate memory for Linkname");
441 ret = ARCHIVE_FATAL;
442 goto exit_write_header;
443 }
444 archive_set_error(&a->archive,
445 ARCHIVE_ERRNO_FILE_FORMAT,
446 "Can't translate linkname '%s' to %s",
447 archive_entry_hardlink(entry),
448 archive_string_conversion_charset_name(sconv));
449 ret2 = ARCHIVE_WARN;
450 }
451 if (gnutar->linkname_length == 0) {
452 r = archive_entry_symlink_l(entry, &(gnutar->linkname),
453 &(gnutar->linkname_length), sconv);
454 if (r != 0) {
455 if (errno == ENOMEM) {
456 archive_set_error(&a->archive, ENOMEM,
457 "Can't allocate memory for Linkname");
458 ret = ARCHIVE_FATAL;
459 goto exit_write_header;
460 }
461 archive_set_error(&a->archive,
462 ARCHIVE_ERRNO_FILE_FORMAT,
463 "Can't translate linkname '%s' to %s",
464 archive_entry_hardlink(entry),
465 archive_string_conversion_charset_name(sconv));
466 ret2 = ARCHIVE_WARN;
467 }
468 }
469 if (gnutar->linkname_length > GNUTAR_linkname_size) {
470 size_t length = gnutar->linkname_length + 1;
471 struct archive_entry *temp = archive_entry_new2(&a->archive);
472
473 /* Uname/gname here don't really matter since no one reads them;
474 * these are the values that GNU tar happens to use on FreeBSD. */
475 archive_entry_set_uname(temp, "root");
476 archive_entry_set_gname(temp, "wheel");
477
478 archive_entry_set_pathname(temp, "././@LongLink");
479 archive_entry_set_size(temp, length);
480 ret = archive_format_gnutar_header(a, buff, temp, 'K');
481 archive_entry_free(temp);
482 if (ret < ARCHIVE_WARN)
483 goto exit_write_header;
484 ret = __archive_write_output(a, buff, 512);
485 if (ret < ARCHIVE_WARN)
486 goto exit_write_header;
487 /* Write name and trailing null byte. */
488 ret = __archive_write_output(a, gnutar->linkname, length);
489 if (ret < ARCHIVE_WARN)
490 goto exit_write_header;
491 /* Pad to 512 bytes */
492 ret = __archive_write_nulls(a, 0x1ff & (-(ssize_t)length));
493 if (ret < ARCHIVE_WARN)
494 goto exit_write_header;
495 }
496
497 /* If pathname is longer than 100 chars we need to add an 'L' header. */
498 if (gnutar->pathname_length > GNUTAR_name_size) {
499 const char *pathname = gnutar->pathname;
500 size_t length = gnutar->pathname_length + 1;
501 struct archive_entry *temp = archive_entry_new2(&a->archive);
502
503 /* Uname/gname here don't really matter since no one reads them;
504 * these are the values that GNU tar happens to use on FreeBSD. */
505 archive_entry_set_uname(temp, "root");
506 archive_entry_set_gname(temp, "wheel");
507
508 archive_entry_set_pathname(temp, "././@LongLink");
509 archive_entry_set_size(temp, length);
510 ret = archive_format_gnutar_header(a, buff, temp, 'L');
511 archive_entry_free(temp);
512 if (ret < ARCHIVE_WARN)
513 goto exit_write_header;
514 ret = __archive_write_output(a, buff, 512);
515 if(ret < ARCHIVE_WARN)
516 goto exit_write_header;
517 /* Write pathname + trailing null byte. */
518 ret = __archive_write_output(a, pathname, length);
519 if(ret < ARCHIVE_WARN)
520 goto exit_write_header;
521 /* Pad to multiple of 512 bytes. */
522 ret = __archive_write_nulls(a, 0x1ff & (-(ssize_t)length));
523 if (ret < ARCHIVE_WARN)
524 goto exit_write_header;
525 }
526
527 if (archive_entry_hardlink(entry) != NULL) {
528 tartype = '1';
529 } else
530 switch (archive_entry_filetype(entry)) {
531 case AE_IFREG: tartype = '0' ; break;
532 case AE_IFLNK: tartype = '2' ; break;
533 case AE_IFCHR: tartype = '3' ; break;
534 case AE_IFBLK: tartype = '4' ; break;
535 case AE_IFDIR: tartype = '5' ; break;
536 case AE_IFIFO: tartype = '6' ; break;
537 case AE_IFSOCK:
538 archive_set_error(&a->archive,
539 ARCHIVE_ERRNO_FILE_FORMAT,
540 "tar format cannot archive socket");
541 ret = ARCHIVE_FAILED;
542 goto exit_write_header;
543 default:
544 archive_set_error(&a->archive,
545 ARCHIVE_ERRNO_FILE_FORMAT,
546 "tar format cannot archive this (mode=0%lo)",
547 (unsigned long)archive_entry_mode(entry));
548 ret = ARCHIVE_FAILED;
549 goto exit_write_header;
550 }
551
552 ret = archive_format_gnutar_header(a, buff, entry, tartype);
553 if (ret < ARCHIVE_WARN)
554 goto exit_write_header;
555 if (ret2 < ret)
556 ret = ret2;
557 ret2 = __archive_write_output(a, buff, 512);
558 if (ret2 < ARCHIVE_WARN) {
559 ret = ret2;
560 goto exit_write_header;
561 }
562 if (ret2 < ret)
563 ret = ret2;
564
565 gnutar->entry_bytes_remaining = archive_entry_size(entry);
566 gnutar->entry_padding = 0x1ff & (-(int64_t)gnutar->entry_bytes_remaining);
567 exit_write_header:
568 archive_entry_free(entry_main);
569 return (ret);
570 }
571
572 static int
archive_format_gnutar_header(struct archive_write * a,char h[512],struct archive_entry * entry,int tartype)573 archive_format_gnutar_header(struct archive_write *a, char h[512],
574 struct archive_entry *entry, int tartype)
575 {
576 unsigned int checksum;
577 int i, ret;
578 size_t copy_length;
579 const char *p;
580 struct gnutar *gnutar;
581
582 gnutar = (struct gnutar *)a->format_data;
583
584 ret = 0;
585
586 /*
587 * The "template header" already includes the signature,
588 * various end-of-field markers, and other required elements.
589 */
590 memcpy(h, &template_header, 512);
591
592 /*
593 * Because the block is already null-filled, and strings
594 * are allowed to exactly fill their destination (without null),
595 * I use memcpy(dest, src, strlen()) here a lot to copy strings.
596 */
597
598 if (tartype == 'K' || tartype == 'L') {
599 p = archive_entry_pathname(entry);
600 copy_length = strlen(p);
601 } else {
602 p = gnutar->pathname;
603 copy_length = gnutar->pathname_length;
604 }
605 if (copy_length > GNUTAR_name_size)
606 copy_length = GNUTAR_name_size;
607 memcpy(h + GNUTAR_name_offset, p, copy_length);
608
609 if ((copy_length = gnutar->linkname_length) > 0) {
610 if (copy_length > GNUTAR_linkname_size)
611 copy_length = GNUTAR_linkname_size;
612 memcpy(h + GNUTAR_linkname_offset, gnutar->linkname,
613 copy_length);
614 }
615
616 /* TODO: How does GNU tar handle unames longer than GNUTAR_uname_size? */
617 if (tartype == 'K' || tartype == 'L') {
618 p = archive_entry_uname(entry);
619 copy_length = strlen(p);
620 } else {
621 p = gnutar->uname;
622 copy_length = gnutar->uname_length;
623 }
624 if (copy_length > 0) {
625 if (copy_length > GNUTAR_uname_size)
626 copy_length = GNUTAR_uname_size;
627 memcpy(h + GNUTAR_uname_offset, p, copy_length);
628 }
629
630 /* TODO: How does GNU tar handle gnames longer than GNUTAR_gname_size? */
631 if (tartype == 'K' || tartype == 'L') {
632 p = archive_entry_gname(entry);
633 copy_length = strlen(p);
634 } else {
635 p = gnutar->gname;
636 copy_length = gnutar->gname_length;
637 }
638 if (copy_length > 0) {
639 if (strlen(p) > GNUTAR_gname_size)
640 copy_length = GNUTAR_gname_size;
641 memcpy(h + GNUTAR_gname_offset, p, copy_length);
642 }
643
644 /* By truncating the mode here, we ensure it always fits. */
645 format_octal(archive_entry_mode(entry) & 07777,
646 h + GNUTAR_mode_offset, GNUTAR_mode_size);
647
648 /* GNU tar supports base-256 here, so should never overflow. */
649 if (format_number(archive_entry_uid(entry), h + GNUTAR_uid_offset,
650 GNUTAR_uid_size, GNUTAR_uid_max_size)) {
651 archive_set_error(&a->archive, ERANGE,
652 "Numeric user ID %jd too large",
653 (intmax_t)archive_entry_uid(entry));
654 ret = ARCHIVE_FAILED;
655 }
656
657 /* GNU tar supports base-256 here, so should never overflow. */
658 if (format_number(archive_entry_gid(entry), h + GNUTAR_gid_offset,
659 GNUTAR_gid_size, GNUTAR_gid_max_size)) {
660 archive_set_error(&a->archive, ERANGE,
661 "Numeric group ID %jd too large",
662 (intmax_t)archive_entry_gid(entry));
663 ret = ARCHIVE_FAILED;
664 }
665
666 /* GNU tar supports base-256 here, so should never overflow. */
667 if (format_number(archive_entry_size(entry), h + GNUTAR_size_offset,
668 GNUTAR_size_size, GNUTAR_size_max_size)) {
669 archive_set_error(&a->archive, ERANGE,
670 "File size out of range");
671 ret = ARCHIVE_FAILED;
672 }
673
674 /* Shouldn't overflow before 2106, since mtime field is 33 bits. */
675 format_octal(archive_entry_mtime(entry),
676 h + GNUTAR_mtime_offset, GNUTAR_mtime_size);
677
678 if (archive_entry_filetype(entry) == AE_IFBLK
679 || archive_entry_filetype(entry) == AE_IFCHR) {
680 if (format_octal(archive_entry_rdevmajor(entry),
681 h + GNUTAR_rdevmajor_offset,
682 GNUTAR_rdevmajor_size)) {
683 archive_set_error(&a->archive, ERANGE,
684 "Major device number too large");
685 ret = ARCHIVE_FAILED;
686 }
687
688 if (format_octal(archive_entry_rdevminor(entry),
689 h + GNUTAR_rdevminor_offset,
690 GNUTAR_rdevminor_size)) {
691 archive_set_error(&a->archive, ERANGE,
692 "Minor device number too large");
693 ret = ARCHIVE_FAILED;
694 }
695 }
696
697 h[GNUTAR_typeflag_offset] = tartype;
698
699 checksum = 0;
700 for (i = 0; i < 512; i++)
701 checksum += 255 & (unsigned int)h[i];
702 h[GNUTAR_checksum_offset + 6] = '\0'; /* Can't be pre-set in the template. */
703 /* h[GNUTAR_checksum_offset + 7] = ' '; */ /* This is pre-set in the template. */
704 format_octal(checksum, h + GNUTAR_checksum_offset, 6);
705 return (ret);
706 }
707
708 /*
709 * Format a number into a field, falling back to base-256 if necessary.
710 */
711 static int
format_number(int64_t v,char * p,int s,int maxsize)712 format_number(int64_t v, char *p, int s, int maxsize)
713 {
714 int64_t limit = ((int64_t)1 << (s*3));
715
716 if (v < limit)
717 return (format_octal(v, p, s));
718 return (format_256(v, p, maxsize));
719 }
720
721 /*
722 * Format a number into the specified field using base-256.
723 */
724 static int
format_256(int64_t v,char * p,int s)725 format_256(int64_t v, char *p, int s)
726 {
727 p += s;
728 while (s-- > 0) {
729 *--p = (char)(v & 0xff);
730 v >>= 8;
731 }
732 *p |= 0x80; /* Set the base-256 marker bit. */
733 return (0);
734 }
735
736 /*
737 * Format a number into the specified field using octal.
738 */
739 static int
format_octal(int64_t v,char * p,int s)740 format_octal(int64_t v, char *p, int s)
741 {
742 int len = s;
743
744 /* Octal values can't be negative, so use 0. */
745 if (v < 0)
746 v = 0;
747
748 p += s; /* Start at the end and work backwards. */
749 while (s-- > 0) {
750 *--p = (char)('0' + (v & 7));
751 v >>= 3;
752 }
753
754 if (v == 0)
755 return (0);
756
757 /* If it overflowed, fill field with max value. */
758 while (len-- > 0)
759 *p++ = '7';
760
761 return (-1);
762 }
763