archive_write_set_format_ustar.c revision 358090
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/10/contrib/libarchive/libarchive/archive_write_set_format_ustar.c 358090 2020-02-19 01:51:44Z 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#include "archive_write_set_format_private.h" 48 49struct 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 */ 106static 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 151static ssize_t archive_write_ustar_data(struct archive_write *a, const void *buff, 152 size_t s); 153static int archive_write_ustar_free(struct archive_write *); 154static int archive_write_ustar_close(struct archive_write *); 155static int archive_write_ustar_finish_entry(struct archive_write *); 156static int archive_write_ustar_header(struct archive_write *, 157 struct archive_entry *entry); 158static int archive_write_ustar_options(struct archive_write *, 159 const char *, const char *); 160static int format_256(int64_t, char *, int); 161static int format_number(int64_t, char *, int size, int max, int strict); 162static int format_octal(int64_t, char *, int); 163 164/* 165 * Set output format to 'ustar' format. 166 */ 167int 168archive_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 207static int 208archive_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 236static int 237archive_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 */ 383int 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 */ 636static int 637format_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 */ 669static int 670format_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 */ 684static int 685format_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 714static int 715archive_write_ustar_close(struct archive_write *a) 716{ 717 return (__archive_write_nulls(a, 512*2)); 718} 719 720static int 721archive_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 731static int 732archive_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 744static ssize_t 745archive_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