archive_write_set_format_ustar.c revision 344673
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: stable/11/contrib/libarchive/libarchive/archive_write_set_format_ustar.c 344673 2019-02-28 22:56:15Z mm $"); 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 48struct ustar { 49 uint64_t entry_bytes_remaining; 50 uint64_t entry_padding; 51 52 struct archive_string_conv *opt_sconv; 53 struct archive_string_conv *sconv_default; 54 int init_default_conversion; 55}; 56 57/* 58 * Define structure of POSIX 'ustar' tar header. 59 */ 60#define USTAR_name_offset 0 61#define USTAR_name_size 100 62#define USTAR_mode_offset 100 63#define USTAR_mode_size 6 64#define USTAR_mode_max_size 8 65#define USTAR_uid_offset 108 66#define USTAR_uid_size 6 67#define USTAR_uid_max_size 8 68#define USTAR_gid_offset 116 69#define USTAR_gid_size 6 70#define USTAR_gid_max_size 8 71#define USTAR_size_offset 124 72#define USTAR_size_size 11 73#define USTAR_size_max_size 12 74#define USTAR_mtime_offset 136 75#define USTAR_mtime_size 11 76#define USTAR_mtime_max_size 11 77#define USTAR_checksum_offset 148 78#define USTAR_checksum_size 8 79#define USTAR_typeflag_offset 156 80#define USTAR_typeflag_size 1 81#define USTAR_linkname_offset 157 82#define USTAR_linkname_size 100 83#define USTAR_magic_offset 257 84#define USTAR_magic_size 6 85#define USTAR_version_offset 263 86#define USTAR_version_size 2 87#define USTAR_uname_offset 265 88#define USTAR_uname_size 32 89#define USTAR_gname_offset 297 90#define USTAR_gname_size 32 91#define USTAR_rdevmajor_offset 329 92#define USTAR_rdevmajor_size 6 93#define USTAR_rdevmajor_max_size 8 94#define USTAR_rdevminor_offset 337 95#define USTAR_rdevminor_size 6 96#define USTAR_rdevminor_max_size 8 97#define USTAR_prefix_offset 345 98#define USTAR_prefix_size 155 99#define USTAR_padding_offset 500 100#define USTAR_padding_size 12 101 102/* 103 * A filled-in copy of the header for initialization. 104 */ 105static const char template_header[] = { 106 /* name: 100 bytes */ 107 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, 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, 111 /* Mode, space-null termination: 8 bytes */ 112 '0','0','0','0','0','0', ' ','\0', 113 /* uid, space-null termination: 8 bytes */ 114 '0','0','0','0','0','0', ' ','\0', 115 /* gid, space-null termination: 8 bytes */ 116 '0','0','0','0','0','0', ' ','\0', 117 /* size, space termination: 12 bytes */ 118 '0','0','0','0','0','0','0','0','0','0','0', ' ', 119 /* mtime, space termination: 12 bytes */ 120 '0','0','0','0','0','0','0','0','0','0','0', ' ', 121 /* Initial checksum value: 8 spaces */ 122 ' ',' ',' ',' ',' ',' ',' ',' ', 123 /* Typeflag: 1 byte */ 124 '0', /* '0' = regular file */ 125 /* Linkname: 100 bytes */ 126 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, 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, 130 /* Magic: 6 bytes, Version: 2 bytes */ 131 'u','s','t','a','r','\0', '0','0', 132 /* Uname: 32 bytes */ 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 /* Gname: 32 bytes */ 135 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, 136 /* rdevmajor + space/null padding: 8 bytes */ 137 '0','0','0','0','0','0', ' ','\0', 138 /* rdevminor + space/null padding: 8 bytes */ 139 '0','0','0','0','0','0', ' ','\0', 140 /* Prefix: 155 bytes */ 141 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, 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, 146 /* Padding: 12 bytes */ 147 0,0,0,0,0,0,0,0, 0,0,0,0 148}; 149 150static ssize_t archive_write_ustar_data(struct archive_write *a, const void *buff, 151 size_t s); 152static int archive_write_ustar_free(struct archive_write *); 153static int archive_write_ustar_close(struct archive_write *); 154static int archive_write_ustar_finish_entry(struct archive_write *); 155static int archive_write_ustar_header(struct archive_write *, 156 struct archive_entry *entry); 157static int archive_write_ustar_options(struct archive_write *, 158 const char *, const char *); 159static int format_256(int64_t, char *, int); 160static int format_number(int64_t, char *, int size, int max, int strict); 161static int format_octal(int64_t, char *, int); 162 163/* 164 * Set output format to 'ustar' format. 165 */ 166int 167archive_write_set_format_ustar(struct archive *_a) 168{ 169 struct archive_write *a = (struct archive_write *)_a; 170 struct ustar *ustar; 171 172 archive_check_magic(_a, ARCHIVE_WRITE_MAGIC, 173 ARCHIVE_STATE_NEW, "archive_write_set_format_ustar"); 174 175 /* If someone else was already registered, unregister them. */ 176 if (a->format_free != NULL) 177 (a->format_free)(a); 178 179 /* Basic internal sanity test. */ 180 if (sizeof(template_header) != 512) { 181 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 182 "Internal: template_header wrong size: %zu should be 512", 183 sizeof(template_header)); 184 return (ARCHIVE_FATAL); 185 } 186 187 ustar = (struct ustar *)calloc(1, sizeof(*ustar)); 188 if (ustar == NULL) { 189 archive_set_error(&a->archive, ENOMEM, 190 "Can't allocate ustar data"); 191 return (ARCHIVE_FATAL); 192 } 193 a->format_data = ustar; 194 a->format_name = "ustar"; 195 a->format_options = archive_write_ustar_options; 196 a->format_write_header = archive_write_ustar_header; 197 a->format_write_data = archive_write_ustar_data; 198 a->format_close = archive_write_ustar_close; 199 a->format_free = archive_write_ustar_free; 200 a->format_finish_entry = archive_write_ustar_finish_entry; 201 a->archive.archive_format = ARCHIVE_FORMAT_TAR_USTAR; 202 a->archive.archive_format_name = "POSIX ustar"; 203 return (ARCHIVE_OK); 204} 205 206static int 207archive_write_ustar_options(struct archive_write *a, const char *key, 208 const char *val) 209{ 210 struct ustar *ustar = (struct ustar *)a->format_data; 211 int ret = ARCHIVE_FAILED; 212 213 if (strcmp(key, "hdrcharset") == 0) { 214 if (val == NULL || val[0] == 0) 215 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 216 "%s: hdrcharset option needs a character-set name", 217 a->format_name); 218 else { 219 ustar->opt_sconv = archive_string_conversion_to_charset( 220 &a->archive, val, 0); 221 if (ustar->opt_sconv != NULL) 222 ret = ARCHIVE_OK; 223 else 224 ret = ARCHIVE_FATAL; 225 } 226 return (ret); 227 } 228 229 /* Note: The "warn" return is just to inform the options 230 * supervisor that we didn't handle it. It will generate 231 * a suitable error if no one used this option. */ 232 return (ARCHIVE_WARN); 233} 234 235static int 236archive_write_ustar_header(struct archive_write *a, struct archive_entry *entry) 237{ 238 char buff[512]; 239 int ret, ret2; 240 struct ustar *ustar; 241 struct archive_entry *entry_main; 242 struct archive_string_conv *sconv; 243 244 ustar = (struct ustar *)a->format_data; 245 246 /* Setup default string conversion. */ 247 if (ustar->opt_sconv == NULL) { 248 if (!ustar->init_default_conversion) { 249 ustar->sconv_default = 250 archive_string_default_conversion_for_write(&(a->archive)); 251 ustar->init_default_conversion = 1; 252 } 253 sconv = ustar->sconv_default; 254 } else 255 sconv = ustar->opt_sconv; 256 257 /* Sanity check. */ 258 if (archive_entry_pathname(entry) == NULL) { 259 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 260 "Can't record entry in tar file without pathname"); 261 return (ARCHIVE_FAILED); 262 } 263 264 /* Only regular files (not hardlinks) have data. */ 265 if (archive_entry_hardlink(entry) != NULL || 266 archive_entry_symlink(entry) != NULL || 267 !(archive_entry_filetype(entry) == AE_IFREG)) 268 archive_entry_set_size(entry, 0); 269 270 if (AE_IFDIR == archive_entry_filetype(entry)) { 271 const char *p; 272 size_t path_length; 273 /* 274 * Ensure a trailing '/'. Modify the entry so 275 * the client sees the change. 276 */ 277#if defined(_WIN32) && !defined(__CYGWIN__) 278 const wchar_t *wp; 279 280 wp = archive_entry_pathname_w(entry); 281 if (wp != NULL && wp[wcslen(wp) -1] != L'/') { 282 struct archive_wstring ws; 283 284 archive_string_init(&ws); 285 path_length = wcslen(wp); 286 if (archive_wstring_ensure(&ws, 287 path_length + 2) == NULL) { 288 archive_set_error(&a->archive, ENOMEM, 289 "Can't allocate ustar data"); 290 archive_wstring_free(&ws); 291 return(ARCHIVE_FATAL); 292 } 293 /* Should we keep '\' ? */ 294 if (wp[path_length -1] == L'\\') 295 path_length--; 296 archive_wstrncpy(&ws, wp, path_length); 297 archive_wstrappend_wchar(&ws, L'/'); 298 archive_entry_copy_pathname_w(entry, ws.s); 299 archive_wstring_free(&ws); 300 p = NULL; 301 } else 302#endif 303 p = archive_entry_pathname(entry); 304 /* 305 * On Windows, this is a backup operation just in 306 * case getting WCS failed. On POSIX, this is a 307 * normal operation. 308 */ 309 if (p != NULL && p[0] != '\0' && p[strlen(p) - 1] != '/') { 310 struct archive_string as; 311 312 archive_string_init(&as); 313 path_length = strlen(p); 314 if (archive_string_ensure(&as, 315 path_length + 2) == NULL) { 316 archive_set_error(&a->archive, ENOMEM, 317 "Can't allocate ustar data"); 318 archive_string_free(&as); 319 return(ARCHIVE_FATAL); 320 } 321#if defined(_WIN32) && !defined(__CYGWIN__) 322 /* NOTE: This might break the pathname 323 * if the current code page is CP932 and 324 * the pathname includes a character '\' 325 * as a part of its multibyte pathname. */ 326 if (p[strlen(p) -1] == '\\') 327 path_length--; 328 else 329#endif 330 archive_strncpy(&as, p, path_length); 331 archive_strappend_char(&as, '/'); 332 archive_entry_copy_pathname(entry, as.s); 333 archive_string_free(&as); 334 } 335 } 336 337#if defined(_WIN32) && !defined(__CYGWIN__) 338 /* Make sure the path separators in pathname, hardlink and symlink 339 * are all slash '/', not the Windows path separator '\'. */ 340 entry_main = __la_win_entry_in_posix_pathseparator(entry); 341 if (entry_main == NULL) { 342 archive_set_error(&a->archive, ENOMEM, 343 "Can't allocate ustar data"); 344 return(ARCHIVE_FATAL); 345 } 346 if (entry != entry_main) 347 entry = entry_main; 348 else 349 entry_main = NULL; 350#else 351 entry_main = NULL; 352#endif 353 ret = __archive_write_format_header_ustar(a, buff, entry, -1, 1, sconv); 354 if (ret < ARCHIVE_WARN) { 355 archive_entry_free(entry_main); 356 return (ret); 357 } 358 ret2 = __archive_write_output(a, buff, 512); 359 if (ret2 < ARCHIVE_WARN) { 360 archive_entry_free(entry_main); 361 return (ret2); 362 } 363 if (ret2 < ret) 364 ret = ret2; 365 366 ustar->entry_bytes_remaining = archive_entry_size(entry); 367 ustar->entry_padding = 0x1ff & (-(int64_t)ustar->entry_bytes_remaining); 368 archive_entry_free(entry_main); 369 return (ret); 370} 371 372/* 373 * Format a basic 512-byte "ustar" header. 374 * 375 * Returns -1 if format failed (due to field overflow). 376 * Note that this always formats as much of the header as possible. 377 * If "strict" is set to zero, it will extend numeric fields as 378 * necessary (overwriting terminators or using base-256 extensions). 379 * 380 * This is exported so that other 'tar' formats can use it. 381 */ 382int 383__archive_write_format_header_ustar(struct archive_write *a, char h[512], 384 struct archive_entry *entry, int tartype, int strict, 385 struct archive_string_conv *sconv) 386{ 387 unsigned int checksum; 388 int i, r, ret; 389 size_t copy_length; 390 const char *p, *pp; 391 int mytartype; 392 393 ret = 0; 394 mytartype = -1; 395 /* 396 * The "template header" already includes the "ustar" 397 * signature, various end-of-field markers and other required 398 * elements. 399 */ 400 memcpy(h, &template_header, 512); 401 402 /* 403 * Because the block is already null-filled, and strings 404 * are allowed to exactly fill their destination (without null), 405 * I use memcpy(dest, src, strlen()) here a lot to copy strings. 406 */ 407 r = archive_entry_pathname_l(entry, &pp, ©_length, sconv); 408 if (r != 0) { 409 if (errno == ENOMEM) { 410 archive_set_error(&a->archive, ENOMEM, 411 "Can't allocate memory for Pathname"); 412 return (ARCHIVE_FATAL); 413 } 414 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 415 "Can't translate pathname '%s' to %s", 416 pp, archive_string_conversion_charset_name(sconv)); 417 ret = ARCHIVE_WARN; 418 } 419 if (copy_length <= USTAR_name_size) 420 memcpy(h + USTAR_name_offset, pp, copy_length); 421 else { 422 /* Store in two pieces, splitting at a '/'. */ 423 p = strchr(pp + copy_length - USTAR_name_size - 1, '/'); 424 /* 425 * Look for the next '/' if we chose the first character 426 * as the separator. (ustar format doesn't permit 427 * an empty prefix.) 428 */ 429 if (p == pp) 430 p = strchr(p + 1, '/'); 431 /* Fail if the name won't fit. */ 432 if (!p) { 433 /* No separator. */ 434 archive_set_error(&a->archive, ENAMETOOLONG, 435 "Pathname too long"); 436 ret = ARCHIVE_FAILED; 437 } else if (p[1] == '\0') { 438 /* 439 * The only feasible separator is a final '/'; 440 * this would result in a non-empty prefix and 441 * an empty name, which POSIX doesn't 442 * explicitly forbid, but it just feels wrong. 443 */ 444 archive_set_error(&a->archive, ENAMETOOLONG, 445 "Pathname too long"); 446 ret = ARCHIVE_FAILED; 447 } else if (p > pp + USTAR_prefix_size) { 448 /* Prefix is too long. */ 449 archive_set_error(&a->archive, ENAMETOOLONG, 450 "Pathname too long"); 451 ret = ARCHIVE_FAILED; 452 } else { 453 /* Copy prefix and remainder to appropriate places */ 454 memcpy(h + USTAR_prefix_offset, pp, p - pp); 455 memcpy(h + USTAR_name_offset, p + 1, 456 pp + copy_length - p - 1); 457 } 458 } 459 460 r = archive_entry_hardlink_l(entry, &p, ©_length, sconv); 461 if (r != 0) { 462 if (errno == ENOMEM) { 463 archive_set_error(&a->archive, ENOMEM, 464 "Can't allocate memory for Linkname"); 465 return (ARCHIVE_FATAL); 466 } 467 archive_set_error(&a->archive, 468 ARCHIVE_ERRNO_FILE_FORMAT, 469 "Can't translate linkname '%s' to %s", 470 p, archive_string_conversion_charset_name(sconv)); 471 ret = ARCHIVE_WARN; 472 } 473 if (copy_length > 0) 474 mytartype = '1'; 475 else { 476 r = archive_entry_symlink_l(entry, &p, ©_length, sconv); 477 if (r != 0) { 478 if (errno == ENOMEM) { 479 archive_set_error(&a->archive, ENOMEM, 480 "Can't allocate memory for Linkname"); 481 return (ARCHIVE_FATAL); 482 } 483 archive_set_error(&a->archive, 484 ARCHIVE_ERRNO_FILE_FORMAT, 485 "Can't translate linkname '%s' to %s", 486 p, archive_string_conversion_charset_name(sconv)); 487 ret = ARCHIVE_WARN; 488 } 489 } 490 if (copy_length > 0) { 491 if (copy_length > USTAR_linkname_size) { 492 archive_set_error(&a->archive, ENAMETOOLONG, 493 "Link contents too long"); 494 ret = ARCHIVE_FAILED; 495 copy_length = USTAR_linkname_size; 496 } 497 memcpy(h + USTAR_linkname_offset, p, copy_length); 498 } 499 500 r = archive_entry_uname_l(entry, &p, ©_length, sconv); 501 if (r != 0) { 502 if (errno == ENOMEM) { 503 archive_set_error(&a->archive, ENOMEM, 504 "Can't allocate memory for Uname"); 505 return (ARCHIVE_FATAL); 506 } 507 archive_set_error(&a->archive, 508 ARCHIVE_ERRNO_FILE_FORMAT, 509 "Can't translate uname '%s' to %s", 510 p, archive_string_conversion_charset_name(sconv)); 511 ret = ARCHIVE_WARN; 512 } 513 if (copy_length > 0) { 514 if (copy_length > USTAR_uname_size) { 515 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 516 "Username too long"); 517 ret = ARCHIVE_FAILED; 518 copy_length = USTAR_uname_size; 519 } 520 memcpy(h + USTAR_uname_offset, p, copy_length); 521 } 522 523 r = archive_entry_gname_l(entry, &p, ©_length, sconv); 524 if (r != 0) { 525 if (errno == ENOMEM) { 526 archive_set_error(&a->archive, ENOMEM, 527 "Can't allocate memory for Gname"); 528 return (ARCHIVE_FATAL); 529 } 530 archive_set_error(&a->archive, 531 ARCHIVE_ERRNO_FILE_FORMAT, 532 "Can't translate gname '%s' to %s", 533 p, archive_string_conversion_charset_name(sconv)); 534 ret = ARCHIVE_WARN; 535 } 536 if (copy_length > 0) { 537 if (strlen(p) > USTAR_gname_size) { 538 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 539 "Group name too long"); 540 ret = ARCHIVE_FAILED; 541 copy_length = USTAR_gname_size; 542 } 543 memcpy(h + USTAR_gname_offset, p, copy_length); 544 } 545 546 if (format_number(archive_entry_mode(entry) & 07777, 547 h + USTAR_mode_offset, USTAR_mode_size, USTAR_mode_max_size, strict)) { 548 archive_set_error(&a->archive, ERANGE, 549 "Numeric mode too large"); 550 ret = ARCHIVE_FAILED; 551 } 552 553 if (format_number(archive_entry_uid(entry), 554 h + USTAR_uid_offset, USTAR_uid_size, USTAR_uid_max_size, strict)) { 555 archive_set_error(&a->archive, ERANGE, 556 "Numeric user ID too large"); 557 ret = ARCHIVE_FAILED; 558 } 559 560 if (format_number(archive_entry_gid(entry), 561 h + USTAR_gid_offset, USTAR_gid_size, USTAR_gid_max_size, strict)) { 562 archive_set_error(&a->archive, ERANGE, 563 "Numeric group ID too large"); 564 ret = ARCHIVE_FAILED; 565 } 566 567 if (format_number(archive_entry_size(entry), 568 h + USTAR_size_offset, USTAR_size_size, USTAR_size_max_size, strict)) { 569 archive_set_error(&a->archive, ERANGE, 570 "File size out of range"); 571 ret = ARCHIVE_FAILED; 572 } 573 574 if (format_number(archive_entry_mtime(entry), 575 h + USTAR_mtime_offset, USTAR_mtime_size, USTAR_mtime_max_size, strict)) { 576 archive_set_error(&a->archive, ERANGE, 577 "File modification time too large"); 578 ret = ARCHIVE_FAILED; 579 } 580 581 if (archive_entry_filetype(entry) == AE_IFBLK 582 || archive_entry_filetype(entry) == AE_IFCHR) { 583 if (format_number(archive_entry_rdevmajor(entry), 584 h + USTAR_rdevmajor_offset, USTAR_rdevmajor_size, 585 USTAR_rdevmajor_max_size, strict)) { 586 archive_set_error(&a->archive, ERANGE, 587 "Major device number too large"); 588 ret = ARCHIVE_FAILED; 589 } 590 591 if (format_number(archive_entry_rdevminor(entry), 592 h + USTAR_rdevminor_offset, USTAR_rdevminor_size, 593 USTAR_rdevminor_max_size, strict)) { 594 archive_set_error(&a->archive, ERANGE, 595 "Minor device number too large"); 596 ret = ARCHIVE_FAILED; 597 } 598 } 599 600 if (tartype >= 0) { 601 h[USTAR_typeflag_offset] = tartype; 602 } else if (mytartype >= 0) { 603 h[USTAR_typeflag_offset] = mytartype; 604 } else { 605 switch (archive_entry_filetype(entry)) { 606 case AE_IFREG: h[USTAR_typeflag_offset] = '0' ; break; 607 case AE_IFLNK: h[USTAR_typeflag_offset] = '2' ; break; 608 case AE_IFCHR: h[USTAR_typeflag_offset] = '3' ; break; 609 case AE_IFBLK: h[USTAR_typeflag_offset] = '4' ; break; 610 case AE_IFDIR: h[USTAR_typeflag_offset] = '5' ; break; 611 case AE_IFIFO: h[USTAR_typeflag_offset] = '6' ; break; 612 case AE_IFSOCK: 613 archive_set_error(&a->archive, 614 ARCHIVE_ERRNO_FILE_FORMAT, 615 "tar format cannot archive socket"); 616 return (ARCHIVE_FAILED); 617 default: 618 archive_set_error(&a->archive, 619 ARCHIVE_ERRNO_FILE_FORMAT, 620 "tar format cannot archive this (mode=0%lo)", 621 (unsigned long)archive_entry_mode(entry)); 622 ret = ARCHIVE_FAILED; 623 } 624 } 625 626 checksum = 0; 627 for (i = 0; i < 512; i++) 628 checksum += 255 & (unsigned int)h[i]; 629 h[USTAR_checksum_offset + 6] = '\0'; /* Can't be pre-set in the template. */ 630 /* h[USTAR_checksum_offset + 7] = ' '; */ /* This is pre-set in the template. */ 631 format_octal(checksum, h + USTAR_checksum_offset, 6); 632 return (ret); 633} 634 635/* 636 * Format a number into a field, with some intelligence. 637 */ 638static int 639format_number(int64_t v, char *p, int s, int maxsize, int strict) 640{ 641 int64_t limit; 642 643 limit = ((int64_t)1 << (s*3)); 644 645 /* "Strict" only permits octal values with proper termination. */ 646 if (strict) 647 return (format_octal(v, p, s)); 648 649 /* 650 * In non-strict mode, we allow the number to overwrite one or 651 * more bytes of the field termination. Even old tar 652 * implementations should be able to handle this with no 653 * problem. 654 */ 655 if (v >= 0) { 656 while (s <= maxsize) { 657 if (v < limit) 658 return (format_octal(v, p, s)); 659 s++; 660 limit <<= 3; 661 } 662 } 663 664 /* Base-256 can handle any number, positive or negative. */ 665 return (format_256(v, p, maxsize)); 666} 667 668/* 669 * Format a number into the specified field using base-256. 670 */ 671static int 672format_256(int64_t v, char *p, int s) 673{ 674 p += s; 675 while (s-- > 0) { 676 *--p = (char)(v & 0xff); 677 v >>= 8; 678 } 679 *p |= 0x80; /* Set the base-256 marker bit. */ 680 return (0); 681} 682 683/* 684 * Format a number into the specified field. 685 */ 686static int 687format_octal(int64_t v, char *p, int s) 688{ 689 int len; 690 691 len = s; 692 693 /* Octal values can't be negative, so use 0. */ 694 if (v < 0) { 695 while (len-- > 0) 696 *p++ = '0'; 697 return (-1); 698 } 699 700 p += s; /* Start at the end and work backwards. */ 701 while (s-- > 0) { 702 *--p = (char)('0' + (v & 7)); 703 v >>= 3; 704 } 705 706 if (v == 0) 707 return (0); 708 709 /* If it overflowed, fill field with max value. */ 710 while (len-- > 0) 711 *p++ = '7'; 712 713 return (-1); 714} 715 716static int 717archive_write_ustar_close(struct archive_write *a) 718{ 719 return (__archive_write_nulls(a, 512*2)); 720} 721 722static int 723archive_write_ustar_free(struct archive_write *a) 724{ 725 struct ustar *ustar; 726 727 ustar = (struct ustar *)a->format_data; 728 free(ustar); 729 a->format_data = NULL; 730 return (ARCHIVE_OK); 731} 732 733static int 734archive_write_ustar_finish_entry(struct archive_write *a) 735{ 736 struct ustar *ustar; 737 int ret; 738 739 ustar = (struct ustar *)a->format_data; 740 ret = __archive_write_nulls(a, 741 (size_t)(ustar->entry_bytes_remaining + ustar->entry_padding)); 742 ustar->entry_bytes_remaining = ustar->entry_padding = 0; 743 return (ret); 744} 745 746static ssize_t 747archive_write_ustar_data(struct archive_write *a, const void *buff, size_t s) 748{ 749 struct ustar *ustar; 750 int ret; 751 752 ustar = (struct ustar *)a->format_data; 753 if (s > ustar->entry_bytes_remaining) 754 s = (size_t)ustar->entry_bytes_remaining; 755 ret = __archive_write_output(a, buff, s); 756 ustar->entry_bytes_remaining -= s; 757 if (ret != ARCHIVE_OK) 758 return (ret); 759 return (s); 760} 761