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 48 struct 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 */ 105 static 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 }; 149 150 static ssize_t archive_write_ustar_data(struct archive_write *a, const void *buff, 151 size_t s); 152 static int archive_write_ustar_free(struct archive_write *); 153 static int archive_write_ustar_close(struct archive_write *); 154 static int archive_write_ustar_finish_entry(struct archive_write *); 155 static int archive_write_ustar_header(struct archive_write *, 156 struct archive_entry *entry); 157 static int archive_write_ustar_options(struct archive_write *, 158 const char *, const char *); 159 static int format_256(int64_t, char *, int); 160 static int format_number(int64_t, char *, int size, int max, int strict); 161 static int format_octal(int64_t, char *, int); 162 163 /* 164 * Set output format to 'ustar' format. 165 */ 166 int 167 archive_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 } 205 206 static int 207 archive_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 } 234 235 static int 236 archive_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 if (entry_main) 356 archive_entry_free(entry_main); 357 return (ret); 358 } 359 ret2 = __archive_write_output(a, buff, 512); 360 if (ret2 < ARCHIVE_WARN) { 361 if (entry_main) 362 archive_entry_free(entry_main); 363 return (ret2); 364 } 365 if (ret2 < ret) 366 ret = ret2; 367 368 ustar->entry_bytes_remaining = archive_entry_size(entry); 369 ustar->entry_padding = 0x1ff & (-(int64_t)ustar->entry_bytes_remaining); 370 if (entry_main) 371 archive_entry_free(entry_main); 372 return (ret); 373 } 374 375 /* 376 * Format a basic 512-byte "ustar" header. 377 * 378 * Returns -1 if format failed (due to field overflow). 379 * Note that this always formats as much of the header as possible. 380 * If "strict" is set to zero, it will extend numeric fields as 381 * necessary (overwriting terminators or using base-256 extensions). 382 * 383 * This is exported so that other 'tar' formats can use it. 384 */ 385 int 386 __archive_write_format_header_ustar(struct archive_write *a, char h[512], 387 struct archive_entry *entry, int tartype, int strict, 388 struct archive_string_conv *sconv) 389 { 390 unsigned int checksum; 391 int i, r, ret; 392 size_t copy_length; 393 const char *p, *pp; 394 int mytartype; 395 396 ret = 0; 397 mytartype = -1; 398 /* 399 * The "template header" already includes the "ustar" 400 * signature, various end-of-field markers and other required 401 * elements. 402 */ 403 memcpy(h, &template_header, 512); 404 405 /* 406 * Because the block is already null-filled, and strings 407 * are allowed to exactly fill their destination (without null), 408 * I use memcpy(dest, src, strlen()) here a lot to copy strings. 409 */ 410 r = archive_entry_pathname_l(entry, &pp, ©_length, sconv); 411 if (r != 0) { 412 if (errno == ENOMEM) { 413 archive_set_error(&a->archive, ENOMEM, 414 "Can't allocate memory for Pathname"); 415 return (ARCHIVE_FATAL); 416 } 417 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 418 "Can't translate pathname '%s' to %s", 419 pp, archive_string_conversion_charset_name(sconv)); 420 ret = ARCHIVE_WARN; 421 } 422 if (copy_length <= USTAR_name_size) 423 memcpy(h + USTAR_name_offset, pp, copy_length); 424 else { 425 /* Store in two pieces, splitting at a '/'. */ 426 p = strchr(pp + copy_length - USTAR_name_size - 1, '/'); 427 /* 428 * Look for the next '/' if we chose the first character 429 * as the separator. (ustar format doesn't permit 430 * an empty prefix.) 431 */ 432 if (p == pp) 433 p = strchr(p + 1, '/'); 434 /* Fail if the name won't fit. */ 435 if (!p) { 436 /* No separator. */ 437 archive_set_error(&a->archive, ENAMETOOLONG, 438 "Pathname too long"); 439 ret = ARCHIVE_FAILED; 440 } else if (p[1] == '\0') { 441 /* 442 * The only feasible separator is a final '/'; 443 * this would result in a non-empty prefix and 444 * an empty name, which POSIX doesn't 445 * explicitly forbid, but it just feels wrong. 446 */ 447 archive_set_error(&a->archive, ENAMETOOLONG, 448 "Pathname too long"); 449 ret = ARCHIVE_FAILED; 450 } else if (p > pp + USTAR_prefix_size) { 451 /* Prefix is too long. */ 452 archive_set_error(&a->archive, ENAMETOOLONG, 453 "Pathname too long"); 454 ret = ARCHIVE_FAILED; 455 } else { 456 /* Copy prefix and remainder to appropriate places */ 457 memcpy(h + USTAR_prefix_offset, pp, p - pp); 458 memcpy(h + USTAR_name_offset, p + 1, 459 pp + copy_length - p - 1); 460 } 461 } 462 463 r = archive_entry_hardlink_l(entry, &p, ©_length, sconv); 464 if (r != 0) { 465 if (errno == ENOMEM) { 466 archive_set_error(&a->archive, ENOMEM, 467 "Can't allocate memory for Linkname"); 468 return (ARCHIVE_FATAL); 469 } 470 archive_set_error(&a->archive, 471 ARCHIVE_ERRNO_FILE_FORMAT, 472 "Can't translate linkname '%s' to %s", 473 p, archive_string_conversion_charset_name(sconv)); 474 ret = ARCHIVE_WARN; 475 } 476 if (copy_length > 0) 477 mytartype = '1'; 478 else { 479 r = archive_entry_symlink_l(entry, &p, ©_length, sconv); 480 if (r != 0) { 481 if (errno == ENOMEM) { 482 archive_set_error(&a->archive, ENOMEM, 483 "Can't allocate memory for Linkname"); 484 return (ARCHIVE_FATAL); 485 } 486 archive_set_error(&a->archive, 487 ARCHIVE_ERRNO_FILE_FORMAT, 488 "Can't translate linkname '%s' to %s", 489 p, archive_string_conversion_charset_name(sconv)); 490 ret = ARCHIVE_WARN; 491 } 492 } 493 if (copy_length > 0) { 494 if (copy_length > USTAR_linkname_size) { 495 archive_set_error(&a->archive, ENAMETOOLONG, 496 "Link contents too long"); 497 ret = ARCHIVE_FAILED; 498 copy_length = USTAR_linkname_size; 499 } 500 memcpy(h + USTAR_linkname_offset, p, copy_length); 501 } 502 503 r = archive_entry_uname_l(entry, &p, ©_length, sconv); 504 if (r != 0) { 505 if (errno == ENOMEM) { 506 archive_set_error(&a->archive, ENOMEM, 507 "Can't allocate memory for Uname"); 508 return (ARCHIVE_FATAL); 509 } 510 archive_set_error(&a->archive, 511 ARCHIVE_ERRNO_FILE_FORMAT, 512 "Can't translate uname '%s' to %s", 513 p, archive_string_conversion_charset_name(sconv)); 514 ret = ARCHIVE_WARN; 515 } 516 if (copy_length > 0) { 517 if (copy_length > USTAR_uname_size) { 518 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 519 "Username too long"); 520 ret = ARCHIVE_FAILED; 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 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 542 "Group name too long"); 543 ret = ARCHIVE_FAILED; 544 copy_length = USTAR_gname_size; 545 } 546 memcpy(h + USTAR_gname_offset, p, copy_length); 547 } 548 549 if (format_number(archive_entry_mode(entry) & 07777, 550 h + USTAR_mode_offset, USTAR_mode_size, USTAR_mode_max_size, strict)) { 551 archive_set_error(&a->archive, ERANGE, 552 "Numeric mode too large"); 553 ret = ARCHIVE_FAILED; 554 } 555 556 if (format_number(archive_entry_uid(entry), 557 h + USTAR_uid_offset, USTAR_uid_size, USTAR_uid_max_size, strict)) { 558 archive_set_error(&a->archive, ERANGE, 559 "Numeric user ID too large"); 560 ret = ARCHIVE_FAILED; 561 } 562 563 if (format_number(archive_entry_gid(entry), 564 h + USTAR_gid_offset, USTAR_gid_size, USTAR_gid_max_size, strict)) { 565 archive_set_error(&a->archive, ERANGE, 566 "Numeric group ID too large"); 567 ret = ARCHIVE_FAILED; 568 } 569 570 if (format_number(archive_entry_size(entry), 571 h + USTAR_size_offset, USTAR_size_size, USTAR_size_max_size, strict)) { 572 archive_set_error(&a->archive, ERANGE, 573 "File size out of range"); 574 ret = ARCHIVE_FAILED; 575 } 576 577 if (format_number(archive_entry_mtime(entry), 578 h + USTAR_mtime_offset, USTAR_mtime_size, USTAR_mtime_max_size, strict)) { 579 archive_set_error(&a->archive, ERANGE, 580 "File modification time too large"); 581 ret = ARCHIVE_FAILED; 582 } 583 584 if (archive_entry_filetype(entry) == AE_IFBLK 585 || archive_entry_filetype(entry) == AE_IFCHR) { 586 if (format_number(archive_entry_rdevmajor(entry), 587 h + USTAR_rdevmajor_offset, USTAR_rdevmajor_size, 588 USTAR_rdevmajor_max_size, strict)) { 589 archive_set_error(&a->archive, ERANGE, 590 "Major device number too large"); 591 ret = ARCHIVE_FAILED; 592 } 593 594 if (format_number(archive_entry_rdevminor(entry), 595 h + USTAR_rdevminor_offset, USTAR_rdevminor_size, 596 USTAR_rdevminor_max_size, strict)) { 597 archive_set_error(&a->archive, ERANGE, 598 "Minor device number too large"); 599 ret = ARCHIVE_FAILED; 600 } 601 } 602 603 if (tartype >= 0) { 604 h[USTAR_typeflag_offset] = tartype; 605 } else if (mytartype >= 0) { 606 h[USTAR_typeflag_offset] = mytartype; 607 } else { 608 switch (archive_entry_filetype(entry)) { 609 case AE_IFREG: h[USTAR_typeflag_offset] = '0' ; break; 610 case AE_IFLNK: h[USTAR_typeflag_offset] = '2' ; break; 611 case AE_IFCHR: h[USTAR_typeflag_offset] = '3' ; break; 612 case AE_IFBLK: h[USTAR_typeflag_offset] = '4' ; break; 613 case AE_IFDIR: h[USTAR_typeflag_offset] = '5' ; break; 614 case AE_IFIFO: h[USTAR_typeflag_offset] = '6' ; break; 615 case AE_IFSOCK: 616 archive_set_error(&a->archive, 617 ARCHIVE_ERRNO_FILE_FORMAT, 618 "tar format cannot archive socket"); 619 return (ARCHIVE_FAILED); 620 default: 621 archive_set_error(&a->archive, 622 ARCHIVE_ERRNO_FILE_FORMAT, 623 "tar format cannot archive this (mode=0%lo)", 624 (unsigned long)archive_entry_mode(entry)); 625 ret = ARCHIVE_FAILED; 626 } 627 } 628 629 checksum = 0; 630 for (i = 0; i < 512; i++) 631 checksum += 255 & (unsigned int)h[i]; 632 h[USTAR_checksum_offset + 6] = '\0'; /* Can't be pre-set in the template. */ 633 /* h[USTAR_checksum_offset + 7] = ' '; */ /* This is pre-set in the template. */ 634 format_octal(checksum, h + USTAR_checksum_offset, 6); 635 return (ret); 636 } 637 638 /* 639 * Format a number into a field, with some intelligence. 640 */ 641 static int 642 format_number(int64_t v, char *p, int s, int maxsize, int strict) 643 { 644 int64_t limit; 645 646 limit = ((int64_t)1 << (s*3)); 647 648 /* "Strict" only permits octal values with proper termination. */ 649 if (strict) 650 return (format_octal(v, p, s)); 651 652 /* 653 * In non-strict mode, we allow the number to overwrite one or 654 * more bytes of the field termination. Even old tar 655 * implementations should be able to handle this with no 656 * problem. 657 */ 658 if (v >= 0) { 659 while (s <= maxsize) { 660 if (v < limit) 661 return (format_octal(v, p, s)); 662 s++; 663 limit <<= 3; 664 } 665 } 666 667 /* Base-256 can handle any number, positive or negative. */ 668 return (format_256(v, p, maxsize)); 669 } 670 671 /* 672 * Format a number into the specified field using base-256. 673 */ 674 static int 675 format_256(int64_t v, char *p, int s) 676 { 677 p += s; 678 while (s-- > 0) { 679 *--p = (char)(v & 0xff); 680 v >>= 8; 681 } 682 *p |= 0x80; /* Set the base-256 marker bit. */ 683 return (0); 684 } 685 686 /* 687 * Format a number into the specified field. 688 */ 689 static int 690 format_octal(int64_t v, char *p, int s) 691 { 692 int len; 693 694 len = s; 695 696 /* Octal values can't be negative, so use 0. */ 697 if (v < 0) { 698 while (len-- > 0) 699 *p++ = '0'; 700 return (-1); 701 } 702 703 p += s; /* Start at the end and work backwards. */ 704 while (s-- > 0) { 705 *--p = (char)('0' + (v & 7)); 706 v >>= 3; 707 } 708 709 if (v == 0) 710 return (0); 711 712 /* If it overflowed, fill field with max value. */ 713 while (len-- > 0) 714 *p++ = '7'; 715 716 return (-1); 717 } 718 719 static int 720 archive_write_ustar_close(struct archive_write *a) 721 { 722 return (__archive_write_nulls(a, 512*2)); 723 } 724 725 static int 726 archive_write_ustar_free(struct archive_write *a) 727 { 728 struct ustar *ustar; 729 730 ustar = (struct ustar *)a->format_data; 731 free(ustar); 732 a->format_data = NULL; 733 return (ARCHIVE_OK); 734 } 735 736 static int 737 archive_write_ustar_finish_entry(struct archive_write *a) 738 { 739 struct ustar *ustar; 740 int ret; 741 742 ustar = (struct ustar *)a->format_data; 743 ret = __archive_write_nulls(a, 744 (size_t)(ustar->entry_bytes_remaining + ustar->entry_padding)); 745 ustar->entry_bytes_remaining = ustar->entry_padding = 0; 746 return (ret); 747 } 748 749 static ssize_t 750 archive_write_ustar_data(struct archive_write *a, const void *buff, size_t s) 751 { 752 struct ustar *ustar; 753 int ret; 754 755 ustar = (struct ustar *)a->format_data; 756 if (s > ustar->entry_bytes_remaining) 757 s = (size_t)ustar->entry_bytes_remaining; 758 ret = __archive_write_output(a, buff, s); 759 ustar->entry_bytes_remaining -= s; 760 if (ret != ARCHIVE_OK) 761 return (ret); 762 return (s); 763 } 764