1 /*- 2 * Copyright (c) 2003-2007 Tim Kientzle 3 * Copyright (c) 2011-2012 Michihiro NAKAJIMA 4 * Copyright (c) 2016 Martin Matuska 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28 #include "archive_platform.h" 29 __FBSDID("$FreeBSD$"); 30 31 #ifdef HAVE_ERRNO_H 32 #include <errno.h> 33 #endif 34 #include <stddef.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_acl_private.h" /* For ACL parsing routines. */ 44 #include "archive_entry.h" 45 #include "archive_entry_locale.h" 46 #include "archive_private.h" 47 #include "archive_read_private.h" 48 49 #define tar_min(a,b) ((a) < (b) ? (a) : (b)) 50 51 /* 52 * Layout of POSIX 'ustar' tar header. 53 */ 54 struct archive_entry_header_ustar { 55 char name[100]; 56 char mode[8]; 57 char uid[8]; 58 char gid[8]; 59 char size[12]; 60 char mtime[12]; 61 char checksum[8]; 62 char typeflag[1]; 63 char linkname[100]; /* "old format" header ends here */ 64 char magic[6]; /* For POSIX: "ustar\0" */ 65 char version[2]; /* For POSIX: "00" */ 66 char uname[32]; 67 char gname[32]; 68 char rdevmajor[8]; 69 char rdevminor[8]; 70 char prefix[155]; 71 }; 72 73 /* 74 * Structure of GNU tar header 75 */ 76 struct gnu_sparse { 77 char offset[12]; 78 char numbytes[12]; 79 }; 80 81 struct archive_entry_header_gnutar { 82 char name[100]; 83 char mode[8]; 84 char uid[8]; 85 char gid[8]; 86 char size[12]; 87 char mtime[12]; 88 char checksum[8]; 89 char typeflag[1]; 90 char linkname[100]; 91 char magic[8]; /* "ustar \0" (note blank/blank/null at end) */ 92 char uname[32]; 93 char gname[32]; 94 char rdevmajor[8]; 95 char rdevminor[8]; 96 char atime[12]; 97 char ctime[12]; 98 char offset[12]; 99 char longnames[4]; 100 char unused[1]; 101 struct gnu_sparse sparse[4]; 102 char isextended[1]; 103 char realsize[12]; 104 /* 105 * Old GNU format doesn't use POSIX 'prefix' field; they use 106 * the 'L' (longname) entry instead. 107 */ 108 }; 109 110 /* 111 * Data specific to this format. 112 */ 113 struct sparse_block { 114 struct sparse_block *next; 115 int64_t offset; 116 int64_t remaining; 117 int hole; 118 }; 119 120 struct tar { 121 struct archive_string acl_text; 122 struct archive_string entry_pathname; 123 /* For "GNU.sparse.name" and other similar path extensions. */ 124 struct archive_string entry_pathname_override; 125 struct archive_string entry_linkpath; 126 struct archive_string entry_uname; 127 struct archive_string entry_gname; 128 struct archive_string longlink; 129 struct archive_string longname; 130 struct archive_string pax_header; 131 struct archive_string pax_global; 132 struct archive_string line; 133 int pax_hdrcharset_binary; 134 int header_recursion_depth; 135 int64_t entry_bytes_remaining; 136 int64_t entry_offset; 137 int64_t entry_padding; 138 int64_t entry_bytes_unconsumed; 139 int64_t realsize; 140 int sparse_allowed; 141 struct sparse_block *sparse_list; 142 struct sparse_block *sparse_last; 143 int64_t sparse_offset; 144 int64_t sparse_numbytes; 145 int sparse_gnu_major; 146 int sparse_gnu_minor; 147 char sparse_gnu_pending; 148 149 struct archive_string localname; 150 struct archive_string_conv *opt_sconv; 151 struct archive_string_conv *sconv; 152 struct archive_string_conv *sconv_acl; 153 struct archive_string_conv *sconv_default; 154 int init_default_conversion; 155 int compat_2x; 156 int process_mac_extensions; 157 int read_concatenated_archives; 158 int realsize_override; 159 }; 160 161 static int archive_block_is_null(const char *p); 162 static char *base64_decode(const char *, size_t, size_t *); 163 static int gnu_add_sparse_entry(struct archive_read *, struct tar *, 164 int64_t offset, int64_t remaining); 165 166 static void gnu_clear_sparse_list(struct tar *); 167 static int gnu_sparse_old_read(struct archive_read *, struct tar *, 168 const struct archive_entry_header_gnutar *header, size_t *); 169 static int gnu_sparse_old_parse(struct archive_read *, struct tar *, 170 const struct gnu_sparse *sparse, int length); 171 static int gnu_sparse_01_parse(struct archive_read *, struct tar *, 172 const char *); 173 static ssize_t gnu_sparse_10_read(struct archive_read *, struct tar *, 174 size_t *); 175 static int header_Solaris_ACL(struct archive_read *, struct tar *, 176 struct archive_entry *, const void *, size_t *); 177 static int header_common(struct archive_read *, struct tar *, 178 struct archive_entry *, const void *); 179 static int header_old_tar(struct archive_read *, struct tar *, 180 struct archive_entry *, const void *); 181 static int header_pax_extensions(struct archive_read *, struct tar *, 182 struct archive_entry *, const void *, size_t *); 183 static int header_pax_global(struct archive_read *, struct tar *, 184 struct archive_entry *, const void *h, size_t *); 185 static int header_longlink(struct archive_read *, struct tar *, 186 struct archive_entry *, const void *h, size_t *); 187 static int header_longname(struct archive_read *, struct tar *, 188 struct archive_entry *, const void *h, size_t *); 189 static int read_mac_metadata_blob(struct archive_read *, struct tar *, 190 struct archive_entry *, const void *h, size_t *); 191 static int header_volume(struct archive_read *, struct tar *, 192 struct archive_entry *, const void *h, size_t *); 193 static int header_ustar(struct archive_read *, struct tar *, 194 struct archive_entry *, const void *h); 195 static int header_gnutar(struct archive_read *, struct tar *, 196 struct archive_entry *, const void *h, size_t *); 197 static int archive_read_format_tar_bid(struct archive_read *, int); 198 static int archive_read_format_tar_options(struct archive_read *, 199 const char *, const char *); 200 static int archive_read_format_tar_cleanup(struct archive_read *); 201 static int archive_read_format_tar_read_data(struct archive_read *a, 202 const void **buff, size_t *size, int64_t *offset); 203 static int archive_read_format_tar_skip(struct archive_read *a); 204 static int archive_read_format_tar_read_header(struct archive_read *, 205 struct archive_entry *); 206 static int checksum(struct archive_read *, const void *); 207 static int pax_attribute(struct archive_read *, struct tar *, 208 struct archive_entry *, const char *key, const char *value, 209 size_t value_length); 210 static int pax_attribute_acl(struct archive_read *, struct tar *, 211 struct archive_entry *, const char *, int); 212 static int pax_attribute_xattr(struct archive_entry *, const char *, 213 const char *); 214 static int pax_header(struct archive_read *, struct tar *, 215 struct archive_entry *, struct archive_string *); 216 static void pax_time(const char *, int64_t *sec, long *nanos); 217 static ssize_t readline(struct archive_read *, struct tar *, const char **, 218 ssize_t limit, size_t *); 219 static int read_body_to_string(struct archive_read *, struct tar *, 220 struct archive_string *, const void *h, size_t *); 221 static int solaris_sparse_parse(struct archive_read *, struct tar *, 222 struct archive_entry *, const char *); 223 static int64_t tar_atol(const char *, size_t); 224 static int64_t tar_atol10(const char *, size_t); 225 static int64_t tar_atol256(const char *, size_t); 226 static int64_t tar_atol8(const char *, size_t); 227 static int tar_read_header(struct archive_read *, struct tar *, 228 struct archive_entry *, size_t *); 229 static int tohex(int c); 230 static char *url_decode(const char *); 231 static void tar_flush_unconsumed(struct archive_read *, size_t *); 232 233 234 int 235 archive_read_support_format_gnutar(struct archive *a) 236 { 237 archive_check_magic(a, ARCHIVE_READ_MAGIC, 238 ARCHIVE_STATE_NEW, "archive_read_support_format_gnutar"); 239 return (archive_read_support_format_tar(a)); 240 } 241 242 243 int 244 archive_read_support_format_tar(struct archive *_a) 245 { 246 struct archive_read *a = (struct archive_read *)_a; 247 struct tar *tar; 248 int r; 249 250 archive_check_magic(_a, ARCHIVE_READ_MAGIC, 251 ARCHIVE_STATE_NEW, "archive_read_support_format_tar"); 252 253 tar = (struct tar *)calloc(1, sizeof(*tar)); 254 #ifdef HAVE_COPYFILE_H 255 /* Set this by default on Mac OS. */ 256 tar->process_mac_extensions = 1; 257 #endif 258 if (tar == NULL) { 259 archive_set_error(&a->archive, ENOMEM, 260 "Can't allocate tar data"); 261 return (ARCHIVE_FATAL); 262 } 263 264 r = __archive_read_register_format(a, tar, "tar", 265 archive_read_format_tar_bid, 266 archive_read_format_tar_options, 267 archive_read_format_tar_read_header, 268 archive_read_format_tar_read_data, 269 archive_read_format_tar_skip, 270 NULL, 271 archive_read_format_tar_cleanup, 272 NULL, 273 NULL); 274 275 if (r != ARCHIVE_OK) 276 free(tar); 277 return (ARCHIVE_OK); 278 } 279 280 static int 281 archive_read_format_tar_cleanup(struct archive_read *a) 282 { 283 struct tar *tar; 284 285 tar = (struct tar *)(a->format->data); 286 gnu_clear_sparse_list(tar); 287 archive_string_free(&tar->acl_text); 288 archive_string_free(&tar->entry_pathname); 289 archive_string_free(&tar->entry_pathname_override); 290 archive_string_free(&tar->entry_linkpath); 291 archive_string_free(&tar->entry_uname); 292 archive_string_free(&tar->entry_gname); 293 archive_string_free(&tar->line); 294 archive_string_free(&tar->pax_global); 295 archive_string_free(&tar->pax_header); 296 archive_string_free(&tar->longname); 297 archive_string_free(&tar->longlink); 298 archive_string_free(&tar->localname); 299 free(tar); 300 (a->format->data) = NULL; 301 return (ARCHIVE_OK); 302 } 303 304 /* 305 * Validate number field 306 * 307 * This has to be pretty lenient in order to accommodate the enormous 308 * variety of tar writers in the world: 309 * = POSIX (IEEE Std 1003.1-1988) ustar requires octal values with leading 310 * zeros and allows fields to be terminated with space or null characters 311 * = Many writers use different termination (in particular, libarchive 312 * omits terminator bytes to squeeze one or two more digits) 313 * = Many writers pad with space and omit leading zeros 314 * = GNU tar and star write base-256 values if numbers are too 315 * big to be represented in octal 316 * 317 * Examples of specific tar headers that we should support: 318 * = Perl Archive::Tar terminates uid, gid, devminor and devmajor with two 319 * null bytes, pads size with spaces and other numeric fields with zeroes 320 * = plexus-archiver prior to 2.6.3 (before switching to commons-compress) 321 * may have uid and gid fields filled with spaces without any octal digits 322 * at all and pads all numeric fields with spaces 323 * 324 * This should tolerate all variants in use. It will reject a field 325 * where the writer just left garbage after a trailing NUL. 326 */ 327 static int 328 validate_number_field(const char* p_field, size_t i_size) 329 { 330 unsigned char marker = (unsigned char)p_field[0]; 331 if (marker == 128 || marker == 255 || marker == 0) { 332 /* Base-256 marker, there's nothing we can check. */ 333 return 1; 334 } else { 335 /* Must be octal */ 336 size_t i = 0; 337 /* Skip any leading spaces */ 338 while (i < i_size && p_field[i] == ' ') { 339 ++i; 340 } 341 /* Skip octal digits. */ 342 while (i < i_size && p_field[i] >= '0' && p_field[i] <= '7') { 343 ++i; 344 } 345 /* Any remaining characters must be space or NUL padding. */ 346 while (i < i_size) { 347 if (p_field[i] != ' ' && p_field[i] != 0) { 348 return 0; 349 } 350 ++i; 351 } 352 return 1; 353 } 354 } 355 356 static int 357 archive_read_format_tar_bid(struct archive_read *a, int best_bid) 358 { 359 int bid; 360 const char *h; 361 const struct archive_entry_header_ustar *header; 362 363 (void)best_bid; /* UNUSED */ 364 365 bid = 0; 366 367 /* Now let's look at the actual header and see if it matches. */ 368 h = __archive_read_ahead(a, 512, NULL); 369 if (h == NULL) 370 return (-1); 371 372 /* If it's an end-of-archive mark, we can handle it. */ 373 if (h[0] == 0 && archive_block_is_null(h)) { 374 /* 375 * Usually, I bid the number of bits verified, but 376 * in this case, 4096 seems excessive so I picked 10 as 377 * an arbitrary but reasonable-seeming value. 378 */ 379 return (10); 380 } 381 382 /* If it's not an end-of-archive mark, it must have a valid checksum.*/ 383 if (!checksum(a, h)) 384 return (0); 385 bid += 48; /* Checksum is usually 6 octal digits. */ 386 387 header = (const struct archive_entry_header_ustar *)h; 388 389 /* Recognize POSIX formats. */ 390 if ((memcmp(header->magic, "ustar\0", 6) == 0) 391 && (memcmp(header->version, "00", 2) == 0)) 392 bid += 56; 393 394 /* Recognize GNU tar format. */ 395 if ((memcmp(header->magic, "ustar ", 6) == 0) 396 && (memcmp(header->version, " \0", 2) == 0)) 397 bid += 56; 398 399 /* Type flag must be null, digit or A-Z, a-z. */ 400 if (header->typeflag[0] != 0 && 401 !( header->typeflag[0] >= '0' && header->typeflag[0] <= '9') && 402 !( header->typeflag[0] >= 'A' && header->typeflag[0] <= 'Z') && 403 !( header->typeflag[0] >= 'a' && header->typeflag[0] <= 'z') ) 404 return (0); 405 bid += 2; /* 6 bits of variation in an 8-bit field leaves 2 bits. */ 406 407 /* 408 * Check format of mode/uid/gid/mtime/size/rdevmajor/rdevminor fields. 409 */ 410 if (bid > 0 && ( 411 validate_number_field(header->mode, sizeof(header->mode)) == 0 412 || validate_number_field(header->uid, sizeof(header->uid)) == 0 413 || validate_number_field(header->gid, sizeof(header->gid)) == 0 414 || validate_number_field(header->mtime, sizeof(header->mtime)) == 0 415 || validate_number_field(header->size, sizeof(header->size)) == 0 416 || validate_number_field(header->rdevmajor, sizeof(header->rdevmajor)) == 0 417 || validate_number_field(header->rdevminor, sizeof(header->rdevminor)) == 0)) { 418 bid = 0; 419 } 420 421 return (bid); 422 } 423 424 static int 425 archive_read_format_tar_options(struct archive_read *a, 426 const char *key, const char *val) 427 { 428 struct tar *tar; 429 int ret = ARCHIVE_FAILED; 430 431 tar = (struct tar *)(a->format->data); 432 if (strcmp(key, "compat-2x") == 0) { 433 /* Handle UTF-8 filenames as libarchive 2.x */ 434 tar->compat_2x = (val != NULL && val[0] != 0); 435 tar->init_default_conversion = tar->compat_2x; 436 return (ARCHIVE_OK); 437 } else if (strcmp(key, "hdrcharset") == 0) { 438 if (val == NULL || val[0] == 0) 439 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 440 "tar: hdrcharset option needs a character-set name"); 441 else { 442 tar->opt_sconv = 443 archive_string_conversion_from_charset( 444 &a->archive, val, 0); 445 if (tar->opt_sconv != NULL) 446 ret = ARCHIVE_OK; 447 else 448 ret = ARCHIVE_FATAL; 449 } 450 return (ret); 451 } else if (strcmp(key, "mac-ext") == 0) { 452 tar->process_mac_extensions = (val != NULL && val[0] != 0); 453 return (ARCHIVE_OK); 454 } else if (strcmp(key, "read_concatenated_archives") == 0) { 455 tar->read_concatenated_archives = (val != NULL && val[0] != 0); 456 return (ARCHIVE_OK); 457 } 458 459 /* Note: The "warn" return is just to inform the options 460 * supervisor that we didn't handle it. It will generate 461 * a suitable error if no one used this option. */ 462 return (ARCHIVE_WARN); 463 } 464 465 /* utility function- this exists to centralize the logic of tracking 466 * how much unconsumed data we have floating around, and to consume 467 * anything outstanding since we're going to do read_aheads 468 */ 469 static void 470 tar_flush_unconsumed(struct archive_read *a, size_t *unconsumed) 471 { 472 if (*unconsumed) { 473 /* 474 void *data = (void *)__archive_read_ahead(a, *unconsumed, NULL); 475 * this block of code is to poison claimed unconsumed space, ensuring 476 * things break if it is in use still. 477 * currently it WILL break things, so enable it only for debugging this issue 478 if (data) { 479 memset(data, 0xff, *unconsumed); 480 } 481 */ 482 __archive_read_consume(a, *unconsumed); 483 *unconsumed = 0; 484 } 485 } 486 487 /* 488 * The function invoked by archive_read_next_header(). This 489 * just sets up a few things and then calls the internal 490 * tar_read_header() function below. 491 */ 492 static int 493 archive_read_format_tar_read_header(struct archive_read *a, 494 struct archive_entry *entry) 495 { 496 /* 497 * When converting tar archives to cpio archives, it is 498 * essential that each distinct file have a distinct inode 499 * number. To simplify this, we keep a static count here to 500 * assign fake dev/inode numbers to each tar entry. Note that 501 * pax format archives may overwrite this with something more 502 * useful. 503 * 504 * Ideally, we would track every file read from the archive so 505 * that we could assign the same dev/ino pair to hardlinks, 506 * but the memory required to store a complete lookup table is 507 * probably not worthwhile just to support the relatively 508 * obscure tar->cpio conversion case. 509 */ 510 static int default_inode; 511 static int default_dev; 512 struct tar *tar; 513 const char *p; 514 const wchar_t *wp; 515 int r; 516 size_t l, unconsumed = 0; 517 518 /* Assign default device/inode values. */ 519 archive_entry_set_dev(entry, 1 + default_dev); /* Don't use zero. */ 520 archive_entry_set_ino(entry, ++default_inode); /* Don't use zero. */ 521 /* Limit generated st_ino number to 16 bits. */ 522 if (default_inode >= 0xffff) { 523 ++default_dev; 524 default_inode = 0; 525 } 526 527 tar = (struct tar *)(a->format->data); 528 tar->entry_offset = 0; 529 gnu_clear_sparse_list(tar); 530 tar->realsize = -1; /* Mark this as "unset" */ 531 tar->realsize_override = 0; 532 533 /* Setup default string conversion. */ 534 tar->sconv = tar->opt_sconv; 535 if (tar->sconv == NULL) { 536 if (!tar->init_default_conversion) { 537 tar->sconv_default = 538 archive_string_default_conversion_for_read(&(a->archive)); 539 tar->init_default_conversion = 1; 540 } 541 tar->sconv = tar->sconv_default; 542 } 543 544 r = tar_read_header(a, tar, entry, &unconsumed); 545 546 tar_flush_unconsumed(a, &unconsumed); 547 548 /* 549 * "non-sparse" files are really just sparse files with 550 * a single block. 551 */ 552 if (tar->sparse_list == NULL) { 553 if (gnu_add_sparse_entry(a, tar, 0, tar->entry_bytes_remaining) 554 != ARCHIVE_OK) 555 return (ARCHIVE_FATAL); 556 } else { 557 struct sparse_block *sb; 558 559 for (sb = tar->sparse_list; sb != NULL; sb = sb->next) { 560 if (!sb->hole) 561 archive_entry_sparse_add_entry(entry, 562 sb->offset, sb->remaining); 563 } 564 } 565 566 if (r == ARCHIVE_OK && archive_entry_filetype(entry) == AE_IFREG) { 567 /* 568 * "Regular" entry with trailing '/' is really 569 * directory: This is needed for certain old tar 570 * variants and even for some broken newer ones. 571 */ 572 if ((wp = archive_entry_pathname_w(entry)) != NULL) { 573 l = wcslen(wp); 574 if (l > 0 && wp[l - 1] == L'/') { 575 archive_entry_set_filetype(entry, AE_IFDIR); 576 } 577 } else if ((p = archive_entry_pathname(entry)) != NULL) { 578 l = strlen(p); 579 if (l > 0 && p[l - 1] == '/') { 580 archive_entry_set_filetype(entry, AE_IFDIR); 581 } 582 } 583 } 584 return (r); 585 } 586 587 static int 588 archive_read_format_tar_read_data(struct archive_read *a, 589 const void **buff, size_t *size, int64_t *offset) 590 { 591 ssize_t bytes_read; 592 struct tar *tar; 593 struct sparse_block *p; 594 595 tar = (struct tar *)(a->format->data); 596 597 for (;;) { 598 /* Remove exhausted entries from sparse list. */ 599 while (tar->sparse_list != NULL && 600 tar->sparse_list->remaining == 0) { 601 p = tar->sparse_list; 602 tar->sparse_list = p->next; 603 free(p); 604 } 605 606 if (tar->entry_bytes_unconsumed) { 607 __archive_read_consume(a, tar->entry_bytes_unconsumed); 608 tar->entry_bytes_unconsumed = 0; 609 } 610 611 /* If we're at end of file, return EOF. */ 612 if (tar->sparse_list == NULL || 613 tar->entry_bytes_remaining == 0) { 614 if (__archive_read_consume(a, tar->entry_padding) < 0) 615 return (ARCHIVE_FATAL); 616 tar->entry_padding = 0; 617 *buff = NULL; 618 *size = 0; 619 *offset = tar->realsize; 620 return (ARCHIVE_EOF); 621 } 622 623 *buff = __archive_read_ahead(a, 1, &bytes_read); 624 if (bytes_read < 0) 625 return (ARCHIVE_FATAL); 626 if (*buff == NULL) { 627 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 628 "Truncated tar archive"); 629 return (ARCHIVE_FATAL); 630 } 631 if (bytes_read > tar->entry_bytes_remaining) 632 bytes_read = (ssize_t)tar->entry_bytes_remaining; 633 /* Don't read more than is available in the 634 * current sparse block. */ 635 if (tar->sparse_list->remaining < bytes_read) 636 bytes_read = (ssize_t)tar->sparse_list->remaining; 637 *size = bytes_read; 638 *offset = tar->sparse_list->offset; 639 tar->sparse_list->remaining -= bytes_read; 640 tar->sparse_list->offset += bytes_read; 641 tar->entry_bytes_remaining -= bytes_read; 642 tar->entry_bytes_unconsumed = bytes_read; 643 644 if (!tar->sparse_list->hole) 645 return (ARCHIVE_OK); 646 /* Current is hole data and skip this. */ 647 } 648 } 649 650 static int 651 archive_read_format_tar_skip(struct archive_read *a) 652 { 653 int64_t bytes_skipped; 654 int64_t request; 655 struct sparse_block *p; 656 struct tar* tar; 657 658 tar = (struct tar *)(a->format->data); 659 660 /* Do not consume the hole of a sparse file. */ 661 request = 0; 662 for (p = tar->sparse_list; p != NULL; p = p->next) { 663 if (!p->hole) { 664 if (p->remaining >= INT64_MAX - request) { 665 return ARCHIVE_FATAL; 666 } 667 request += p->remaining; 668 } 669 } 670 if (request > tar->entry_bytes_remaining) 671 request = tar->entry_bytes_remaining; 672 request += tar->entry_padding + tar->entry_bytes_unconsumed; 673 674 bytes_skipped = __archive_read_consume(a, request); 675 if (bytes_skipped < 0) 676 return (ARCHIVE_FATAL); 677 678 tar->entry_bytes_remaining = 0; 679 tar->entry_bytes_unconsumed = 0; 680 tar->entry_padding = 0; 681 682 /* Free the sparse list. */ 683 gnu_clear_sparse_list(tar); 684 685 return (ARCHIVE_OK); 686 } 687 688 /* 689 * This function recursively interprets all of the headers associated 690 * with a single entry. 691 */ 692 static int 693 tar_read_header(struct archive_read *a, struct tar *tar, 694 struct archive_entry *entry, size_t *unconsumed) 695 { 696 ssize_t bytes; 697 int err; 698 const char *h; 699 const struct archive_entry_header_ustar *header; 700 const struct archive_entry_header_gnutar *gnuheader; 701 702 /* Loop until we find a workable header record. */ 703 for (;;) { 704 tar_flush_unconsumed(a, unconsumed); 705 706 /* Read 512-byte header record */ 707 h = __archive_read_ahead(a, 512, &bytes); 708 if (bytes < 0) 709 return ((int)bytes); 710 if (bytes == 0) { /* EOF at a block boundary. */ 711 /* Some writers do omit the block of nulls. <sigh> */ 712 return (ARCHIVE_EOF); 713 } 714 if (bytes < 512) { /* Short block at EOF; this is bad. */ 715 archive_set_error(&a->archive, 716 ARCHIVE_ERRNO_FILE_FORMAT, 717 "Truncated tar archive"); 718 return (ARCHIVE_FATAL); 719 } 720 *unconsumed = 512; 721 722 /* Header is workable if it's not an end-of-archive mark. */ 723 if (h[0] != 0 || !archive_block_is_null(h)) 724 break; 725 726 /* Ensure format is set for archives with only null blocks. */ 727 if (a->archive.archive_format_name == NULL) { 728 a->archive.archive_format = ARCHIVE_FORMAT_TAR; 729 a->archive.archive_format_name = "tar"; 730 } 731 732 if (!tar->read_concatenated_archives) { 733 /* Try to consume a second all-null record, as well. */ 734 tar_flush_unconsumed(a, unconsumed); 735 h = __archive_read_ahead(a, 512, NULL); 736 if (h != NULL && h[0] == 0 && archive_block_is_null(h)) 737 __archive_read_consume(a, 512); 738 archive_clear_error(&a->archive); 739 return (ARCHIVE_EOF); 740 } 741 742 /* 743 * We're reading concatenated archives, ignore this block and 744 * loop to get the next. 745 */ 746 } 747 748 /* 749 * Note: If the checksum fails and we return ARCHIVE_RETRY, 750 * then the client is likely to just retry. This is a very 751 * crude way to search for the next valid header! 752 * 753 * TODO: Improve this by implementing a real header scan. 754 */ 755 if (!checksum(a, h)) { 756 tar_flush_unconsumed(a, unconsumed); 757 archive_set_error(&a->archive, EINVAL, "Damaged tar archive"); 758 return (ARCHIVE_RETRY); /* Retryable: Invalid header */ 759 } 760 761 if (++tar->header_recursion_depth > 32) { 762 tar_flush_unconsumed(a, unconsumed); 763 archive_set_error(&a->archive, EINVAL, "Too many special headers"); 764 return (ARCHIVE_WARN); 765 } 766 767 /* Determine the format variant. */ 768 header = (const struct archive_entry_header_ustar *)h; 769 770 switch(header->typeflag[0]) { 771 case 'A': /* Solaris tar ACL */ 772 a->archive.archive_format = ARCHIVE_FORMAT_TAR_PAX_INTERCHANGE; 773 a->archive.archive_format_name = "Solaris tar"; 774 err = header_Solaris_ACL(a, tar, entry, h, unconsumed); 775 break; 776 case 'g': /* POSIX-standard 'g' header. */ 777 a->archive.archive_format = ARCHIVE_FORMAT_TAR_PAX_INTERCHANGE; 778 a->archive.archive_format_name = "POSIX pax interchange format"; 779 err = header_pax_global(a, tar, entry, h, unconsumed); 780 if (err == ARCHIVE_EOF) 781 return (err); 782 break; 783 case 'K': /* Long link name (GNU tar, others) */ 784 err = header_longlink(a, tar, entry, h, unconsumed); 785 break; 786 case 'L': /* Long filename (GNU tar, others) */ 787 err = header_longname(a, tar, entry, h, unconsumed); 788 break; 789 case 'V': /* GNU volume header */ 790 err = header_volume(a, tar, entry, h, unconsumed); 791 break; 792 case 'X': /* Used by SUN tar; same as 'x'. */ 793 a->archive.archive_format = ARCHIVE_FORMAT_TAR_PAX_INTERCHANGE; 794 a->archive.archive_format_name = 795 "POSIX pax interchange format (Sun variant)"; 796 err = header_pax_extensions(a, tar, entry, h, unconsumed); 797 break; 798 case 'x': /* POSIX-standard 'x' header. */ 799 a->archive.archive_format = ARCHIVE_FORMAT_TAR_PAX_INTERCHANGE; 800 a->archive.archive_format_name = "POSIX pax interchange format"; 801 err = header_pax_extensions(a, tar, entry, h, unconsumed); 802 break; 803 default: 804 gnuheader = (const struct archive_entry_header_gnutar *)h; 805 if (memcmp(gnuheader->magic, "ustar \0", 8) == 0) { 806 a->archive.archive_format = ARCHIVE_FORMAT_TAR_GNUTAR; 807 a->archive.archive_format_name = "GNU tar format"; 808 err = header_gnutar(a, tar, entry, h, unconsumed); 809 } else if (memcmp(header->magic, "ustar", 5) == 0) { 810 if (a->archive.archive_format != ARCHIVE_FORMAT_TAR_PAX_INTERCHANGE) { 811 a->archive.archive_format = ARCHIVE_FORMAT_TAR_USTAR; 812 a->archive.archive_format_name = "POSIX ustar format"; 813 } 814 err = header_ustar(a, tar, entry, h); 815 } else { 816 a->archive.archive_format = ARCHIVE_FORMAT_TAR; 817 a->archive.archive_format_name = "tar (non-POSIX)"; 818 err = header_old_tar(a, tar, entry, h); 819 } 820 } 821 if (err == ARCHIVE_FATAL) 822 return (err); 823 824 tar_flush_unconsumed(a, unconsumed); 825 826 h = NULL; 827 header = NULL; 828 829 --tar->header_recursion_depth; 830 /* Yuck. Apple's design here ends up storing long pathname 831 * extensions for both the AppleDouble extension entry and the 832 * regular entry. 833 */ 834 if ((err == ARCHIVE_WARN || err == ARCHIVE_OK) && 835 tar->header_recursion_depth == 0 && 836 tar->process_mac_extensions) { 837 int err2 = read_mac_metadata_blob(a, tar, entry, h, unconsumed); 838 if (err2 < err) 839 err = err2; 840 } 841 842 /* We return warnings or success as-is. Anything else is fatal. */ 843 if (err == ARCHIVE_WARN || err == ARCHIVE_OK) { 844 if (tar->sparse_gnu_pending) { 845 if (tar->sparse_gnu_major == 1 && 846 tar->sparse_gnu_minor == 0) { 847 ssize_t bytes_read; 848 849 tar->sparse_gnu_pending = 0; 850 /* Read initial sparse map. */ 851 bytes_read = gnu_sparse_10_read(a, tar, unconsumed); 852 if (bytes_read < 0) 853 return ((int)bytes_read); 854 tar->entry_bytes_remaining -= bytes_read; 855 } else { 856 archive_set_error(&a->archive, 857 ARCHIVE_ERRNO_MISC, 858 "Unrecognized GNU sparse file format"); 859 return (ARCHIVE_WARN); 860 } 861 tar->sparse_gnu_pending = 0; 862 } 863 return (err); 864 } 865 if (err == ARCHIVE_EOF) 866 /* EOF when recursively reading a header is bad. */ 867 archive_set_error(&a->archive, EINVAL, "Damaged tar archive"); 868 return (ARCHIVE_FATAL); 869 } 870 871 /* 872 * Return true if block checksum is correct. 873 */ 874 static int 875 checksum(struct archive_read *a, const void *h) 876 { 877 const unsigned char *bytes; 878 const struct archive_entry_header_ustar *header; 879 int check, sum; 880 size_t i; 881 882 (void)a; /* UNUSED */ 883 bytes = (const unsigned char *)h; 884 header = (const struct archive_entry_header_ustar *)h; 885 886 /* Checksum field must hold an octal number */ 887 for (i = 0; i < sizeof(header->checksum); ++i) { 888 char c = header->checksum[i]; 889 if (c != ' ' && c != '\0' && (c < '0' || c > '7')) 890 return 0; 891 } 892 893 /* 894 * Test the checksum. Note that POSIX specifies _unsigned_ 895 * bytes for this calculation. 896 */ 897 sum = (int)tar_atol(header->checksum, sizeof(header->checksum)); 898 check = 0; 899 for (i = 0; i < 148; i++) 900 check += (unsigned char)bytes[i]; 901 for (; i < 156; i++) 902 check += 32; 903 for (; i < 512; i++) 904 check += (unsigned char)bytes[i]; 905 if (sum == check) 906 return (1); 907 908 /* 909 * Repeat test with _signed_ bytes, just in case this archive 910 * was created by an old BSD, Solaris, or HP-UX tar with a 911 * broken checksum calculation. 912 */ 913 check = 0; 914 for (i = 0; i < 148; i++) 915 check += (signed char)bytes[i]; 916 for (; i < 156; i++) 917 check += 32; 918 for (; i < 512; i++) 919 check += (signed char)bytes[i]; 920 if (sum == check) 921 return (1); 922 923 return (0); 924 } 925 926 /* 927 * Return true if this block contains only nulls. 928 */ 929 static int 930 archive_block_is_null(const char *p) 931 { 932 unsigned i; 933 934 for (i = 0; i < 512; i++) 935 if (*p++) 936 return (0); 937 return (1); 938 } 939 940 /* 941 * Interpret 'A' Solaris ACL header 942 */ 943 static int 944 header_Solaris_ACL(struct archive_read *a, struct tar *tar, 945 struct archive_entry *entry, const void *h, size_t *unconsumed) 946 { 947 const struct archive_entry_header_ustar *header; 948 size_t size; 949 int err, acl_type; 950 int64_t type; 951 char *acl, *p; 952 953 /* 954 * read_body_to_string adds a NUL terminator, but we need a little 955 * more to make sure that we don't overrun acl_text later. 956 */ 957 header = (const struct archive_entry_header_ustar *)h; 958 size = (size_t)tar_atol(header->size, sizeof(header->size)); 959 err = read_body_to_string(a, tar, &(tar->acl_text), h, unconsumed); 960 if (err != ARCHIVE_OK) 961 return (err); 962 963 /* Recursively read next header */ 964 err = tar_read_header(a, tar, entry, unconsumed); 965 if ((err != ARCHIVE_OK) && (err != ARCHIVE_WARN)) 966 return (err); 967 968 /* TODO: Examine the first characters to see if this 969 * is an AIX ACL descriptor. We'll likely never support 970 * them, but it would be polite to recognize and warn when 971 * we do see them. */ 972 973 /* Leading octal number indicates ACL type and number of entries. */ 974 p = acl = tar->acl_text.s; 975 type = 0; 976 while (*p != '\0' && p < acl + size) { 977 if (*p < '0' || *p > '7') { 978 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 979 "Malformed Solaris ACL attribute (invalid digit)"); 980 return(ARCHIVE_WARN); 981 } 982 type <<= 3; 983 type += *p - '0'; 984 if (type > 077777777) { 985 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 986 "Malformed Solaris ACL attribute (count too large)"); 987 return (ARCHIVE_WARN); 988 } 989 p++; 990 } 991 switch ((int)type & ~0777777) { 992 case 01000000: 993 /* POSIX.1e ACL */ 994 acl_type = ARCHIVE_ENTRY_ACL_TYPE_ACCESS; 995 break; 996 case 03000000: 997 /* NFSv4 ACL */ 998 acl_type = ARCHIVE_ENTRY_ACL_TYPE_NFS4; 999 break; 1000 default: 1001 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 1002 "Malformed Solaris ACL attribute (unsupported type %o)", 1003 (int)type); 1004 return (ARCHIVE_WARN); 1005 } 1006 p++; 1007 1008 if (p >= acl + size) { 1009 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 1010 "Malformed Solaris ACL attribute (body overflow)"); 1011 return(ARCHIVE_WARN); 1012 } 1013 1014 /* ACL text is null-terminated; find the end. */ 1015 size -= (p - acl); 1016 acl = p; 1017 1018 while (*p != '\0' && p < acl + size) 1019 p++; 1020 1021 if (tar->sconv_acl == NULL) { 1022 tar->sconv_acl = archive_string_conversion_from_charset( 1023 &(a->archive), "UTF-8", 1); 1024 if (tar->sconv_acl == NULL) 1025 return (ARCHIVE_FATAL); 1026 } 1027 archive_strncpy(&(tar->localname), acl, p - acl); 1028 err = archive_acl_from_text_l(archive_entry_acl(entry), 1029 tar->localname.s, acl_type, tar->sconv_acl); 1030 if (err != ARCHIVE_OK) { 1031 if (errno == ENOMEM) { 1032 archive_set_error(&a->archive, ENOMEM, 1033 "Can't allocate memory for ACL"); 1034 } else 1035 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 1036 "Malformed Solaris ACL attribute (unparsable)"); 1037 } 1038 return (err); 1039 } 1040 1041 /* 1042 * Interpret 'K' long linkname header. 1043 */ 1044 static int 1045 header_longlink(struct archive_read *a, struct tar *tar, 1046 struct archive_entry *entry, const void *h, size_t *unconsumed) 1047 { 1048 int err; 1049 1050 err = read_body_to_string(a, tar, &(tar->longlink), h, unconsumed); 1051 if (err != ARCHIVE_OK) 1052 return (err); 1053 err = tar_read_header(a, tar, entry, unconsumed); 1054 if ((err != ARCHIVE_OK) && (err != ARCHIVE_WARN)) 1055 return (err); 1056 /* Set symlink if symlink already set, else hardlink. */ 1057 archive_entry_copy_link(entry, tar->longlink.s); 1058 return (ARCHIVE_OK); 1059 } 1060 1061 static int 1062 set_conversion_failed_error(struct archive_read *a, 1063 struct archive_string_conv *sconv, const char *name) 1064 { 1065 if (errno == ENOMEM) { 1066 archive_set_error(&a->archive, ENOMEM, 1067 "Can't allocate memory for %s", name); 1068 return (ARCHIVE_FATAL); 1069 } 1070 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 1071 "%s can't be converted from %s to current locale.", 1072 name, archive_string_conversion_charset_name(sconv)); 1073 return (ARCHIVE_WARN); 1074 } 1075 1076 /* 1077 * Interpret 'L' long filename header. 1078 */ 1079 static int 1080 header_longname(struct archive_read *a, struct tar *tar, 1081 struct archive_entry *entry, const void *h, size_t *unconsumed) 1082 { 1083 int err; 1084 1085 err = read_body_to_string(a, tar, &(tar->longname), h, unconsumed); 1086 if (err != ARCHIVE_OK) 1087 return (err); 1088 /* Read and parse "real" header, then override name. */ 1089 err = tar_read_header(a, tar, entry, unconsumed); 1090 if ((err != ARCHIVE_OK) && (err != ARCHIVE_WARN)) 1091 return (err); 1092 if (archive_entry_copy_pathname_l(entry, tar->longname.s, 1093 archive_strlen(&(tar->longname)), tar->sconv) != 0) 1094 err = set_conversion_failed_error(a, tar->sconv, "Pathname"); 1095 return (err); 1096 } 1097 1098 1099 /* 1100 * Interpret 'V' GNU tar volume header. 1101 */ 1102 static int 1103 header_volume(struct archive_read *a, struct tar *tar, 1104 struct archive_entry *entry, const void *h, size_t *unconsumed) 1105 { 1106 (void)h; 1107 1108 /* Just skip this and read the next header. */ 1109 return (tar_read_header(a, tar, entry, unconsumed)); 1110 } 1111 1112 /* 1113 * Read body of an archive entry into an archive_string object. 1114 */ 1115 static int 1116 read_body_to_string(struct archive_read *a, struct tar *tar, 1117 struct archive_string *as, const void *h, size_t *unconsumed) 1118 { 1119 int64_t size; 1120 const struct archive_entry_header_ustar *header; 1121 const void *src; 1122 1123 (void)tar; /* UNUSED */ 1124 header = (const struct archive_entry_header_ustar *)h; 1125 size = tar_atol(header->size, sizeof(header->size)); 1126 if ((size > 1048576) || (size < 0)) { 1127 archive_set_error(&a->archive, EINVAL, 1128 "Special header too large"); 1129 return (ARCHIVE_FATAL); 1130 } 1131 1132 /* Fail if we can't make our buffer big enough. */ 1133 if (archive_string_ensure(as, (size_t)size+1) == NULL) { 1134 archive_set_error(&a->archive, ENOMEM, 1135 "No memory"); 1136 return (ARCHIVE_FATAL); 1137 } 1138 1139 tar_flush_unconsumed(a, unconsumed); 1140 1141 /* Read the body into the string. */ 1142 *unconsumed = (size_t)((size + 511) & ~ 511); 1143 src = __archive_read_ahead(a, *unconsumed, NULL); 1144 if (src == NULL) { 1145 *unconsumed = 0; 1146 return (ARCHIVE_FATAL); 1147 } 1148 memcpy(as->s, src, (size_t)size); 1149 as->s[size] = '\0'; 1150 as->length = (size_t)size; 1151 return (ARCHIVE_OK); 1152 } 1153 1154 /* 1155 * Parse out common header elements. 1156 * 1157 * This would be the same as header_old_tar, except that the 1158 * filename is handled slightly differently for old and POSIX 1159 * entries (POSIX entries support a 'prefix'). This factoring 1160 * allows header_old_tar and header_ustar 1161 * to handle filenames differently, while still putting most of the 1162 * common parsing into one place. 1163 */ 1164 static int 1165 header_common(struct archive_read *a, struct tar *tar, 1166 struct archive_entry *entry, const void *h) 1167 { 1168 const struct archive_entry_header_ustar *header; 1169 char tartype; 1170 int err = ARCHIVE_OK; 1171 1172 header = (const struct archive_entry_header_ustar *)h; 1173 if (header->linkname[0]) 1174 archive_strncpy(&(tar->entry_linkpath), 1175 header->linkname, sizeof(header->linkname)); 1176 else 1177 archive_string_empty(&(tar->entry_linkpath)); 1178 1179 /* Parse out the numeric fields (all are octal) */ 1180 archive_entry_set_mode(entry, 1181 (mode_t)tar_atol(header->mode, sizeof(header->mode))); 1182 archive_entry_set_uid(entry, tar_atol(header->uid, sizeof(header->uid))); 1183 archive_entry_set_gid(entry, tar_atol(header->gid, sizeof(header->gid))); 1184 tar->entry_bytes_remaining = tar_atol(header->size, sizeof(header->size)); 1185 if (tar->entry_bytes_remaining < 0) { 1186 tar->entry_bytes_remaining = 0; 1187 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 1188 "Tar entry has negative size"); 1189 return (ARCHIVE_FATAL); 1190 } 1191 if (tar->entry_bytes_remaining == INT64_MAX) { 1192 /* Note: tar_atol returns INT64_MAX on overflow */ 1193 tar->entry_bytes_remaining = 0; 1194 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 1195 "Tar entry size overflow"); 1196 return (ARCHIVE_FATAL); 1197 } 1198 tar->realsize = tar->entry_bytes_remaining; 1199 archive_entry_set_size(entry, tar->entry_bytes_remaining); 1200 archive_entry_set_mtime(entry, tar_atol(header->mtime, sizeof(header->mtime)), 0); 1201 1202 /* Handle the tar type flag appropriately. */ 1203 tartype = header->typeflag[0]; 1204 1205 switch (tartype) { 1206 case '1': /* Hard link */ 1207 if (archive_entry_copy_hardlink_l(entry, tar->entry_linkpath.s, 1208 archive_strlen(&(tar->entry_linkpath)), tar->sconv) != 0) { 1209 err = set_conversion_failed_error(a, tar->sconv, 1210 "Linkname"); 1211 if (err == ARCHIVE_FATAL) 1212 return (err); 1213 } 1214 /* 1215 * The following may seem odd, but: Technically, tar 1216 * does not store the file type for a "hard link" 1217 * entry, only the fact that it is a hard link. So, I 1218 * leave the type zero normally. But, pax interchange 1219 * format allows hard links to have data, which 1220 * implies that the underlying entry is a regular 1221 * file. 1222 */ 1223 if (archive_entry_size(entry) > 0) 1224 archive_entry_set_filetype(entry, AE_IFREG); 1225 1226 /* 1227 * A tricky point: Traditionally, tar readers have 1228 * ignored the size field when reading hardlink 1229 * entries, and some writers put non-zero sizes even 1230 * though the body is empty. POSIX blessed this 1231 * convention in the 1988 standard, but broke with 1232 * this tradition in 2001 by permitting hardlink 1233 * entries to store valid bodies in pax interchange 1234 * format, but not in ustar format. Since there is no 1235 * hard and fast way to distinguish pax interchange 1236 * from earlier archives (the 'x' and 'g' entries are 1237 * optional, after all), we need a heuristic. 1238 */ 1239 if (archive_entry_size(entry) == 0) { 1240 /* If the size is already zero, we're done. */ 1241 } else if (a->archive.archive_format 1242 == ARCHIVE_FORMAT_TAR_PAX_INTERCHANGE) { 1243 /* Definitely pax extended; must obey hardlink size. */ 1244 } else if (a->archive.archive_format == ARCHIVE_FORMAT_TAR 1245 || a->archive.archive_format == ARCHIVE_FORMAT_TAR_GNUTAR) 1246 { 1247 /* Old-style or GNU tar: we must ignore the size. */ 1248 archive_entry_set_size(entry, 0); 1249 tar->entry_bytes_remaining = 0; 1250 } else if (archive_read_format_tar_bid(a, 50) > 50) { 1251 /* 1252 * We don't know if it's pax: If the bid 1253 * function sees a valid ustar header 1254 * immediately following, then let's ignore 1255 * the hardlink size. 1256 */ 1257 archive_entry_set_size(entry, 0); 1258 tar->entry_bytes_remaining = 0; 1259 } 1260 /* 1261 * TODO: There are still two cases I'd like to handle: 1262 * = a ustar non-pax archive with a hardlink entry at 1263 * end-of-archive. (Look for block of nulls following?) 1264 * = a pax archive that has not seen any pax headers 1265 * and has an entry which is a hardlink entry storing 1266 * a body containing an uncompressed tar archive. 1267 * The first is worth addressing; I don't see any reliable 1268 * way to deal with the second possibility. 1269 */ 1270 break; 1271 case '2': /* Symlink */ 1272 archive_entry_set_filetype(entry, AE_IFLNK); 1273 archive_entry_set_size(entry, 0); 1274 tar->entry_bytes_remaining = 0; 1275 if (archive_entry_copy_symlink_l(entry, tar->entry_linkpath.s, 1276 archive_strlen(&(tar->entry_linkpath)), tar->sconv) != 0) { 1277 err = set_conversion_failed_error(a, tar->sconv, 1278 "Linkname"); 1279 if (err == ARCHIVE_FATAL) 1280 return (err); 1281 } 1282 break; 1283 case '3': /* Character device */ 1284 archive_entry_set_filetype(entry, AE_IFCHR); 1285 archive_entry_set_size(entry, 0); 1286 tar->entry_bytes_remaining = 0; 1287 break; 1288 case '4': /* Block device */ 1289 archive_entry_set_filetype(entry, AE_IFBLK); 1290 archive_entry_set_size(entry, 0); 1291 tar->entry_bytes_remaining = 0; 1292 break; 1293 case '5': /* Dir */ 1294 archive_entry_set_filetype(entry, AE_IFDIR); 1295 archive_entry_set_size(entry, 0); 1296 tar->entry_bytes_remaining = 0; 1297 break; 1298 case '6': /* FIFO device */ 1299 archive_entry_set_filetype(entry, AE_IFIFO); 1300 archive_entry_set_size(entry, 0); 1301 tar->entry_bytes_remaining = 0; 1302 break; 1303 case 'D': /* GNU incremental directory type */ 1304 /* 1305 * No special handling is actually required here. 1306 * It might be nice someday to preprocess the file list and 1307 * provide it to the client, though. 1308 */ 1309 archive_entry_set_filetype(entry, AE_IFDIR); 1310 break; 1311 case 'M': /* GNU "Multi-volume" (remainder of file from last archive)*/ 1312 /* 1313 * As far as I can tell, this is just like a regular file 1314 * entry, except that the contents should be _appended_ to 1315 * the indicated file at the indicated offset. This may 1316 * require some API work to fully support. 1317 */ 1318 break; 1319 case 'N': /* Old GNU "long filename" entry. */ 1320 /* The body of this entry is a script for renaming 1321 * previously-extracted entries. Ugh. It will never 1322 * be supported by libarchive. */ 1323 archive_entry_set_filetype(entry, AE_IFREG); 1324 break; 1325 case 'S': /* GNU sparse files */ 1326 /* 1327 * Sparse files are really just regular files with 1328 * sparse information in the extended area. 1329 */ 1330 /* FALLTHROUGH */ 1331 case '0': 1332 /* 1333 * Enable sparse file "read" support only for regular 1334 * files and explicit GNU sparse files. However, we 1335 * don't allow non-standard file types to be sparse. 1336 */ 1337 tar->sparse_allowed = 1; 1338 /* FALLTHROUGH */ 1339 default: /* Regular file and non-standard types */ 1340 /* 1341 * Per POSIX: non-recognized types should always be 1342 * treated as regular files. 1343 */ 1344 archive_entry_set_filetype(entry, AE_IFREG); 1345 break; 1346 } 1347 return (err); 1348 } 1349 1350 /* 1351 * Parse out header elements for "old-style" tar archives. 1352 */ 1353 static int 1354 header_old_tar(struct archive_read *a, struct tar *tar, 1355 struct archive_entry *entry, const void *h) 1356 { 1357 const struct archive_entry_header_ustar *header; 1358 int err = ARCHIVE_OK, err2; 1359 1360 /* Copy filename over (to ensure null termination). */ 1361 header = (const struct archive_entry_header_ustar *)h; 1362 if (archive_entry_copy_pathname_l(entry, 1363 header->name, sizeof(header->name), tar->sconv) != 0) { 1364 err = set_conversion_failed_error(a, tar->sconv, "Pathname"); 1365 if (err == ARCHIVE_FATAL) 1366 return (err); 1367 } 1368 1369 /* Grab rest of common fields */ 1370 err2 = header_common(a, tar, entry, h); 1371 if (err > err2) 1372 err = err2; 1373 1374 tar->entry_padding = 0x1ff & (-tar->entry_bytes_remaining); 1375 return (err); 1376 } 1377 1378 /* 1379 * Read a Mac AppleDouble-encoded blob of file metadata, 1380 * if there is one. 1381 */ 1382 static int 1383 read_mac_metadata_blob(struct archive_read *a, struct tar *tar, 1384 struct archive_entry *entry, const void *h, size_t *unconsumed) 1385 { 1386 int64_t size; 1387 const void *data; 1388 const char *p, *name; 1389 const wchar_t *wp, *wname; 1390 1391 (void)h; /* UNUSED */ 1392 1393 wname = wp = archive_entry_pathname_w(entry); 1394 if (wp != NULL) { 1395 /* Find the last path element. */ 1396 for (; *wp != L'\0'; ++wp) { 1397 if (wp[0] == '/' && wp[1] != L'\0') 1398 wname = wp + 1; 1399 } 1400 /* 1401 * If last path element starts with "._", then 1402 * this is a Mac extension. 1403 */ 1404 if (wname[0] != L'.' || wname[1] != L'_' || wname[2] == L'\0') 1405 return ARCHIVE_OK; 1406 } else { 1407 /* Find the last path element. */ 1408 name = p = archive_entry_pathname(entry); 1409 if (p == NULL) 1410 return (ARCHIVE_FAILED); 1411 for (; *p != '\0'; ++p) { 1412 if (p[0] == '/' && p[1] != '\0') 1413 name = p + 1; 1414 } 1415 /* 1416 * If last path element starts with "._", then 1417 * this is a Mac extension. 1418 */ 1419 if (name[0] != '.' || name[1] != '_' || name[2] == '\0') 1420 return ARCHIVE_OK; 1421 } 1422 1423 /* Read the body as a Mac OS metadata blob. */ 1424 size = archive_entry_size(entry); 1425 1426 /* 1427 * TODO: Look beyond the body here to peek at the next header. 1428 * If it's a regular header (not an extension header) 1429 * that has the wrong name, just return the current 1430 * entry as-is, without consuming the body here. 1431 * That would reduce the risk of us mis-identifying 1432 * an ordinary file that just happened to have 1433 * a name starting with "._". 1434 * 1435 * Q: Is the above idea really possible? Even 1436 * when there are GNU or pax extension entries? 1437 */ 1438 data = __archive_read_ahead(a, (size_t)size, NULL); 1439 if (data == NULL) { 1440 *unconsumed = 0; 1441 return (ARCHIVE_FATAL); 1442 } 1443 archive_entry_copy_mac_metadata(entry, data, (size_t)size); 1444 *unconsumed = (size_t)((size + 511) & ~ 511); 1445 tar_flush_unconsumed(a, unconsumed); 1446 return (tar_read_header(a, tar, entry, unconsumed)); 1447 } 1448 1449 /* 1450 * Parse a file header for a pax extended archive entry. 1451 */ 1452 static int 1453 header_pax_global(struct archive_read *a, struct tar *tar, 1454 struct archive_entry *entry, const void *h, size_t *unconsumed) 1455 { 1456 int err; 1457 1458 err = read_body_to_string(a, tar, &(tar->pax_global), h, unconsumed); 1459 if (err != ARCHIVE_OK) 1460 return (err); 1461 err = tar_read_header(a, tar, entry, unconsumed); 1462 return (err); 1463 } 1464 1465 static int 1466 header_pax_extensions(struct archive_read *a, struct tar *tar, 1467 struct archive_entry *entry, const void *h, size_t *unconsumed) 1468 { 1469 int err, err2; 1470 1471 err = read_body_to_string(a, tar, &(tar->pax_header), h, unconsumed); 1472 if (err != ARCHIVE_OK) 1473 return (err); 1474 1475 /* Parse the next header. */ 1476 err = tar_read_header(a, tar, entry, unconsumed); 1477 if ((err != ARCHIVE_OK) && (err != ARCHIVE_WARN)) 1478 return (err); 1479 1480 /* 1481 * TODO: Parse global/default options into 'entry' struct here 1482 * before handling file-specific options. 1483 * 1484 * This design (parse standard header, then overwrite with pax 1485 * extended attribute data) usually works well, but isn't ideal; 1486 * it would be better to parse the pax extended attributes first 1487 * and then skip any fields in the standard header that were 1488 * defined in the pax header. 1489 */ 1490 err2 = pax_header(a, tar, entry, &tar->pax_header); 1491 err = err_combine(err, err2); 1492 tar->entry_padding = 0x1ff & (-tar->entry_bytes_remaining); 1493 return (err); 1494 } 1495 1496 1497 /* 1498 * Parse a file header for a Posix "ustar" archive entry. This also 1499 * handles "pax" or "extended ustar" entries. 1500 */ 1501 static int 1502 header_ustar(struct archive_read *a, struct tar *tar, 1503 struct archive_entry *entry, const void *h) 1504 { 1505 const struct archive_entry_header_ustar *header; 1506 struct archive_string *as; 1507 int err = ARCHIVE_OK, r; 1508 1509 header = (const struct archive_entry_header_ustar *)h; 1510 1511 /* Copy name into an internal buffer to ensure null-termination. */ 1512 as = &(tar->entry_pathname); 1513 if (header->prefix[0]) { 1514 archive_strncpy(as, header->prefix, sizeof(header->prefix)); 1515 if (as->s[archive_strlen(as) - 1] != '/') 1516 archive_strappend_char(as, '/'); 1517 archive_strncat(as, header->name, sizeof(header->name)); 1518 } else { 1519 archive_strncpy(as, header->name, sizeof(header->name)); 1520 } 1521 if (archive_entry_copy_pathname_l(entry, as->s, archive_strlen(as), 1522 tar->sconv) != 0) { 1523 err = set_conversion_failed_error(a, tar->sconv, "Pathname"); 1524 if (err == ARCHIVE_FATAL) 1525 return (err); 1526 } 1527 1528 /* Handle rest of common fields. */ 1529 r = header_common(a, tar, entry, h); 1530 if (r == ARCHIVE_FATAL) 1531 return (r); 1532 if (r < err) 1533 err = r; 1534 1535 /* Handle POSIX ustar fields. */ 1536 if (archive_entry_copy_uname_l(entry, 1537 header->uname, sizeof(header->uname), tar->sconv) != 0) { 1538 err = set_conversion_failed_error(a, tar->sconv, "Uname"); 1539 if (err == ARCHIVE_FATAL) 1540 return (err); 1541 } 1542 1543 if (archive_entry_copy_gname_l(entry, 1544 header->gname, sizeof(header->gname), tar->sconv) != 0) { 1545 err = set_conversion_failed_error(a, tar->sconv, "Gname"); 1546 if (err == ARCHIVE_FATAL) 1547 return (err); 1548 } 1549 1550 /* Parse out device numbers only for char and block specials. */ 1551 if (header->typeflag[0] == '3' || header->typeflag[0] == '4') { 1552 archive_entry_set_rdevmajor(entry, (dev_t) 1553 tar_atol(header->rdevmajor, sizeof(header->rdevmajor))); 1554 archive_entry_set_rdevminor(entry, (dev_t) 1555 tar_atol(header->rdevminor, sizeof(header->rdevminor))); 1556 } 1557 1558 tar->entry_padding = 0x1ff & (-tar->entry_bytes_remaining); 1559 1560 return (err); 1561 } 1562 1563 1564 /* 1565 * Parse the pax extended attributes record. 1566 * 1567 * Returns non-zero if there's an error in the data. 1568 */ 1569 static int 1570 pax_header(struct archive_read *a, struct tar *tar, 1571 struct archive_entry *entry, struct archive_string *in_as) 1572 { 1573 size_t attr_length, l, line_length, value_length; 1574 char *p; 1575 char *key, *value; 1576 struct archive_string *as; 1577 struct archive_string_conv *sconv; 1578 int err, err2; 1579 char *attr = in_as->s; 1580 1581 attr_length = in_as->length; 1582 tar->pax_hdrcharset_binary = 0; 1583 archive_string_empty(&(tar->entry_gname)); 1584 archive_string_empty(&(tar->entry_linkpath)); 1585 archive_string_empty(&(tar->entry_pathname)); 1586 archive_string_empty(&(tar->entry_pathname_override)); 1587 archive_string_empty(&(tar->entry_uname)); 1588 err = ARCHIVE_OK; 1589 while (attr_length > 0) { 1590 /* Parse decimal length field at start of line. */ 1591 line_length = 0; 1592 l = attr_length; 1593 p = attr; /* Record start of line. */ 1594 while (l>0) { 1595 if (*p == ' ') { 1596 p++; 1597 l--; 1598 break; 1599 } 1600 if (*p < '0' || *p > '9') { 1601 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 1602 "Ignoring malformed pax extended attributes"); 1603 return (ARCHIVE_WARN); 1604 } 1605 line_length *= 10; 1606 line_length += *p - '0'; 1607 if (line_length > 999999) { 1608 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 1609 "Rejecting pax extended attribute > 1MB"); 1610 return (ARCHIVE_WARN); 1611 } 1612 p++; 1613 l--; 1614 } 1615 1616 /* 1617 * Parsed length must be no bigger than available data, 1618 * at least 1, and the last character of the line must 1619 * be '\n'. 1620 */ 1621 if (line_length > attr_length 1622 || line_length < 1 1623 || attr[line_length - 1] != '\n') 1624 { 1625 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 1626 "Ignoring malformed pax extended attribute"); 1627 return (ARCHIVE_WARN); 1628 } 1629 1630 /* Null-terminate the line. */ 1631 attr[line_length - 1] = '\0'; 1632 1633 /* Find end of key and null terminate it. */ 1634 key = p; 1635 if (key[0] == '=') 1636 return (-1); 1637 while (*p && *p != '=') 1638 ++p; 1639 if (*p == '\0') { 1640 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 1641 "Invalid pax extended attributes"); 1642 return (ARCHIVE_WARN); 1643 } 1644 *p = '\0'; 1645 1646 value = p + 1; 1647 1648 /* Some values may be binary data */ 1649 value_length = attr + line_length - 1 - value; 1650 1651 /* Identify this attribute and set it in the entry. */ 1652 err2 = pax_attribute(a, tar, entry, key, value, value_length); 1653 if (err2 == ARCHIVE_FATAL) 1654 return (err2); 1655 err = err_combine(err, err2); 1656 1657 /* Skip to next line */ 1658 attr += line_length; 1659 attr_length -= line_length; 1660 } 1661 1662 /* 1663 * PAX format uses UTF-8 as default charset for its metadata 1664 * unless hdrcharset=BINARY is present in its header. 1665 * We apply the charset specified by the hdrcharset option only 1666 * when the hdrcharset attribute(in PAX header) is BINARY because 1667 * we respect the charset described in PAX header and BINARY also 1668 * means that metadata(filename,uname and gname) character-set 1669 * is unknown. 1670 */ 1671 if (tar->pax_hdrcharset_binary) 1672 sconv = tar->opt_sconv; 1673 else { 1674 sconv = archive_string_conversion_from_charset( 1675 &(a->archive), "UTF-8", 1); 1676 if (sconv == NULL) 1677 return (ARCHIVE_FATAL); 1678 if (tar->compat_2x) 1679 archive_string_conversion_set_opt(sconv, 1680 SCONV_SET_OPT_UTF8_LIBARCHIVE2X); 1681 } 1682 1683 if (archive_strlen(&(tar->entry_gname)) > 0) { 1684 if (archive_entry_copy_gname_l(entry, tar->entry_gname.s, 1685 archive_strlen(&(tar->entry_gname)), sconv) != 0) { 1686 err = set_conversion_failed_error(a, sconv, "Gname"); 1687 if (err == ARCHIVE_FATAL) 1688 return (err); 1689 /* Use a converted an original name. */ 1690 archive_entry_copy_gname(entry, tar->entry_gname.s); 1691 } 1692 } 1693 if (archive_strlen(&(tar->entry_linkpath)) > 0) { 1694 if (archive_entry_copy_link_l(entry, tar->entry_linkpath.s, 1695 archive_strlen(&(tar->entry_linkpath)), sconv) != 0) { 1696 err = set_conversion_failed_error(a, sconv, "Linkname"); 1697 if (err == ARCHIVE_FATAL) 1698 return (err); 1699 /* Use a converted an original name. */ 1700 archive_entry_copy_link(entry, tar->entry_linkpath.s); 1701 } 1702 } 1703 /* 1704 * Some extensions (such as the GNU sparse file extensions) 1705 * deliberately store a synthetic name under the regular 'path' 1706 * attribute and the real file name under a different attribute. 1707 * Since we're supposed to not care about the order, we 1708 * have no choice but to store all of the various filenames 1709 * we find and figure it all out afterwards. This is the 1710 * figuring out part. 1711 */ 1712 as = NULL; 1713 if (archive_strlen(&(tar->entry_pathname_override)) > 0) 1714 as = &(tar->entry_pathname_override); 1715 else if (archive_strlen(&(tar->entry_pathname)) > 0) 1716 as = &(tar->entry_pathname); 1717 if (as != NULL) { 1718 if (archive_entry_copy_pathname_l(entry, as->s, 1719 archive_strlen(as), sconv) != 0) { 1720 err = set_conversion_failed_error(a, sconv, "Pathname"); 1721 if (err == ARCHIVE_FATAL) 1722 return (err); 1723 /* Use a converted an original name. */ 1724 archive_entry_copy_pathname(entry, as->s); 1725 } 1726 } 1727 if (archive_strlen(&(tar->entry_uname)) > 0) { 1728 if (archive_entry_copy_uname_l(entry, tar->entry_uname.s, 1729 archive_strlen(&(tar->entry_uname)), sconv) != 0) { 1730 err = set_conversion_failed_error(a, sconv, "Uname"); 1731 if (err == ARCHIVE_FATAL) 1732 return (err); 1733 /* Use a converted an original name. */ 1734 archive_entry_copy_uname(entry, tar->entry_uname.s); 1735 } 1736 } 1737 return (err); 1738 } 1739 1740 static int 1741 pax_attribute_xattr(struct archive_entry *entry, 1742 const char *name, const char *value) 1743 { 1744 char *name_decoded; 1745 void *value_decoded; 1746 size_t value_len; 1747 1748 if (strlen(name) < 18 || (memcmp(name, "LIBARCHIVE.xattr.", 17)) != 0) 1749 return 3; 1750 1751 name += 17; 1752 1753 /* URL-decode name */ 1754 name_decoded = url_decode(name); 1755 if (name_decoded == NULL) 1756 return 2; 1757 1758 /* Base-64 decode value */ 1759 value_decoded = base64_decode(value, strlen(value), &value_len); 1760 if (value_decoded == NULL) { 1761 free(name_decoded); 1762 return 1; 1763 } 1764 1765 archive_entry_xattr_add_entry(entry, name_decoded, 1766 value_decoded, value_len); 1767 1768 free(name_decoded); 1769 free(value_decoded); 1770 return 0; 1771 } 1772 1773 static int 1774 pax_attribute_schily_xattr(struct archive_entry *entry, 1775 const char *name, const char *value, size_t value_length) 1776 { 1777 if (strlen(name) < 14 || (memcmp(name, "SCHILY.xattr.", 13)) != 0) 1778 return 1; 1779 1780 name += 13; 1781 1782 archive_entry_xattr_add_entry(entry, name, value, value_length); 1783 1784 return 0; 1785 } 1786 1787 static int 1788 pax_attribute_acl(struct archive_read *a, struct tar *tar, 1789 struct archive_entry *entry, const char *value, int type) 1790 { 1791 int r; 1792 const char* errstr; 1793 1794 switch (type) { 1795 case ARCHIVE_ENTRY_ACL_TYPE_ACCESS: 1796 errstr = "SCHILY.acl.access"; 1797 break; 1798 case ARCHIVE_ENTRY_ACL_TYPE_DEFAULT: 1799 errstr = "SCHILY.acl.default"; 1800 break; 1801 case ARCHIVE_ENTRY_ACL_TYPE_NFS4: 1802 errstr = "SCHILY.acl.ace"; 1803 break; 1804 default: 1805 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 1806 "Unknown ACL type: %d", type); 1807 return(ARCHIVE_FATAL); 1808 } 1809 1810 if (tar->sconv_acl == NULL) { 1811 tar->sconv_acl = 1812 archive_string_conversion_from_charset( 1813 &(a->archive), "UTF-8", 1); 1814 if (tar->sconv_acl == NULL) 1815 return (ARCHIVE_FATAL); 1816 } 1817 1818 r = archive_acl_from_text_l(archive_entry_acl(entry), value, type, 1819 tar->sconv_acl); 1820 if (r != ARCHIVE_OK) { 1821 if (r == ARCHIVE_FATAL) { 1822 archive_set_error(&a->archive, ENOMEM, 1823 "%s %s", "Can't allocate memory for ", 1824 errstr); 1825 return (r); 1826 } 1827 archive_set_error(&a->archive, 1828 ARCHIVE_ERRNO_MISC, "%s %s", "Parse error: ", errstr); 1829 } 1830 return (r); 1831 } 1832 1833 /* 1834 * Parse a single key=value attribute. key/value pointers are 1835 * assumed to point into reasonably long-lived storage. 1836 * 1837 * Note that POSIX reserves all-lowercase keywords. Vendor-specific 1838 * extensions should always have keywords of the form "VENDOR.attribute" 1839 * In particular, it's quite feasible to support many different 1840 * vendor extensions here. I'm using "LIBARCHIVE" for extensions 1841 * unique to this library. 1842 * 1843 * Investigate other vendor-specific extensions and see if 1844 * any of them look useful. 1845 */ 1846 static int 1847 pax_attribute(struct archive_read *a, struct tar *tar, 1848 struct archive_entry *entry, const char *key, const char *value, size_t value_length) 1849 { 1850 int64_t s; 1851 long n; 1852 int err = ARCHIVE_OK, r; 1853 1854 #ifndef __FreeBSD__ 1855 if (value == NULL) 1856 value = ""; /* Disable compiler warning; do not pass 1857 * NULL pointer to strlen(). */ 1858 #endif 1859 switch (key[0]) { 1860 case 'G': 1861 /* Reject GNU.sparse.* headers on non-regular files. */ 1862 if (strncmp(key, "GNU.sparse", 10) == 0 && 1863 !tar->sparse_allowed) { 1864 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 1865 "Non-regular file cannot be sparse"); 1866 return (ARCHIVE_FATAL); 1867 } 1868 1869 /* GNU "0.0" sparse pax format. */ 1870 if (strcmp(key, "GNU.sparse.numblocks") == 0) { 1871 tar->sparse_offset = -1; 1872 tar->sparse_numbytes = -1; 1873 tar->sparse_gnu_major = 0; 1874 tar->sparse_gnu_minor = 0; 1875 } 1876 if (strcmp(key, "GNU.sparse.offset") == 0) { 1877 tar->sparse_offset = tar_atol10(value, strlen(value)); 1878 if (tar->sparse_numbytes != -1) { 1879 if (gnu_add_sparse_entry(a, tar, 1880 tar->sparse_offset, tar->sparse_numbytes) 1881 != ARCHIVE_OK) 1882 return (ARCHIVE_FATAL); 1883 tar->sparse_offset = -1; 1884 tar->sparse_numbytes = -1; 1885 } 1886 } 1887 if (strcmp(key, "GNU.sparse.numbytes") == 0) { 1888 tar->sparse_numbytes = tar_atol10(value, strlen(value)); 1889 if (tar->sparse_numbytes != -1) { 1890 if (gnu_add_sparse_entry(a, tar, 1891 tar->sparse_offset, tar->sparse_numbytes) 1892 != ARCHIVE_OK) 1893 return (ARCHIVE_FATAL); 1894 tar->sparse_offset = -1; 1895 tar->sparse_numbytes = -1; 1896 } 1897 } 1898 if (strcmp(key, "GNU.sparse.size") == 0) { 1899 tar->realsize = tar_atol10(value, strlen(value)); 1900 archive_entry_set_size(entry, tar->realsize); 1901 tar->realsize_override = 1; 1902 } 1903 1904 /* GNU "0.1" sparse pax format. */ 1905 if (strcmp(key, "GNU.sparse.map") == 0) { 1906 tar->sparse_gnu_major = 0; 1907 tar->sparse_gnu_minor = 1; 1908 if (gnu_sparse_01_parse(a, tar, value) != ARCHIVE_OK) 1909 return (ARCHIVE_WARN); 1910 } 1911 1912 /* GNU "1.0" sparse pax format */ 1913 if (strcmp(key, "GNU.sparse.major") == 0) { 1914 tar->sparse_gnu_major = (int)tar_atol10(value, strlen(value)); 1915 tar->sparse_gnu_pending = 1; 1916 } 1917 if (strcmp(key, "GNU.sparse.minor") == 0) { 1918 tar->sparse_gnu_minor = (int)tar_atol10(value, strlen(value)); 1919 tar->sparse_gnu_pending = 1; 1920 } 1921 if (strcmp(key, "GNU.sparse.name") == 0) { 1922 /* 1923 * The real filename; when storing sparse 1924 * files, GNU tar puts a synthesized name into 1925 * the regular 'path' attribute in an attempt 1926 * to limit confusion. ;-) 1927 */ 1928 archive_strcpy(&(tar->entry_pathname_override), value); 1929 } 1930 if (strcmp(key, "GNU.sparse.realsize") == 0) { 1931 tar->realsize = tar_atol10(value, strlen(value)); 1932 archive_entry_set_size(entry, tar->realsize); 1933 tar->realsize_override = 1; 1934 } 1935 break; 1936 case 'L': 1937 /* Our extensions */ 1938 /* TODO: Handle arbitrary extended attributes... */ 1939 /* 1940 if (strcmp(key, "LIBARCHIVE.xxxxxxx") == 0) 1941 archive_entry_set_xxxxxx(entry, value); 1942 */ 1943 if (strcmp(key, "LIBARCHIVE.creationtime") == 0) { 1944 pax_time(value, &s, &n); 1945 archive_entry_set_birthtime(entry, s, n); 1946 } 1947 if (memcmp(key, "LIBARCHIVE.xattr.", 17) == 0) 1948 pax_attribute_xattr(entry, key, value); 1949 break; 1950 case 'S': 1951 /* We support some keys used by the "star" archiver */ 1952 if (strcmp(key, "SCHILY.acl.access") == 0) { 1953 r = pax_attribute_acl(a, tar, entry, value, 1954 ARCHIVE_ENTRY_ACL_TYPE_ACCESS); 1955 if (r == ARCHIVE_FATAL) 1956 return (r); 1957 } else if (strcmp(key, "SCHILY.acl.default") == 0) { 1958 r = pax_attribute_acl(a, tar, entry, value, 1959 ARCHIVE_ENTRY_ACL_TYPE_DEFAULT); 1960 if (r == ARCHIVE_FATAL) 1961 return (r); 1962 } else if (strcmp(key, "SCHILY.acl.ace") == 0) { 1963 r = pax_attribute_acl(a, tar, entry, value, 1964 ARCHIVE_ENTRY_ACL_TYPE_NFS4); 1965 if (r == ARCHIVE_FATAL) 1966 return (r); 1967 } else if (strcmp(key, "SCHILY.devmajor") == 0) { 1968 archive_entry_set_rdevmajor(entry, 1969 (dev_t)tar_atol10(value, strlen(value))); 1970 } else if (strcmp(key, "SCHILY.devminor") == 0) { 1971 archive_entry_set_rdevminor(entry, 1972 (dev_t)tar_atol10(value, strlen(value))); 1973 } else if (strcmp(key, "SCHILY.fflags") == 0) { 1974 archive_entry_copy_fflags_text(entry, value); 1975 } else if (strcmp(key, "SCHILY.dev") == 0) { 1976 archive_entry_set_dev(entry, 1977 (dev_t)tar_atol10(value, strlen(value))); 1978 } else if (strcmp(key, "SCHILY.ino") == 0) { 1979 archive_entry_set_ino(entry, 1980 tar_atol10(value, strlen(value))); 1981 } else if (strcmp(key, "SCHILY.nlink") == 0) { 1982 archive_entry_set_nlink(entry, (unsigned) 1983 tar_atol10(value, strlen(value))); 1984 } else if (strcmp(key, "SCHILY.realsize") == 0) { 1985 tar->realsize = tar_atol10(value, strlen(value)); 1986 tar->realsize_override = 1; 1987 archive_entry_set_size(entry, tar->realsize); 1988 } else if (strncmp(key, "SCHILY.xattr.", 13) == 0) { 1989 pax_attribute_schily_xattr(entry, key, value, 1990 value_length); 1991 } else if (strcmp(key, "SUN.holesdata") == 0) { 1992 /* A Solaris extension for sparse. */ 1993 r = solaris_sparse_parse(a, tar, entry, value); 1994 if (r < err) { 1995 if (r == ARCHIVE_FATAL) 1996 return (r); 1997 err = r; 1998 archive_set_error(&a->archive, 1999 ARCHIVE_ERRNO_MISC, 2000 "Parse error: SUN.holesdata"); 2001 } 2002 } 2003 break; 2004 case 'a': 2005 if (strcmp(key, "atime") == 0) { 2006 pax_time(value, &s, &n); 2007 archive_entry_set_atime(entry, s, n); 2008 } 2009 break; 2010 case 'c': 2011 if (strcmp(key, "ctime") == 0) { 2012 pax_time(value, &s, &n); 2013 archive_entry_set_ctime(entry, s, n); 2014 } else if (strcmp(key, "charset") == 0) { 2015 /* TODO: Publish charset information in entry. */ 2016 } else if (strcmp(key, "comment") == 0) { 2017 /* TODO: Publish comment in entry. */ 2018 } 2019 break; 2020 case 'g': 2021 if (strcmp(key, "gid") == 0) { 2022 archive_entry_set_gid(entry, 2023 tar_atol10(value, strlen(value))); 2024 } else if (strcmp(key, "gname") == 0) { 2025 archive_strcpy(&(tar->entry_gname), value); 2026 } 2027 break; 2028 case 'h': 2029 if (strcmp(key, "hdrcharset") == 0) { 2030 if (strcmp(value, "BINARY") == 0) 2031 /* Binary mode. */ 2032 tar->pax_hdrcharset_binary = 1; 2033 else if (strcmp(value, "ISO-IR 10646 2000 UTF-8") == 0) 2034 tar->pax_hdrcharset_binary = 0; 2035 } 2036 break; 2037 case 'l': 2038 /* pax interchange doesn't distinguish hardlink vs. symlink. */ 2039 if (strcmp(key, "linkpath") == 0) { 2040 archive_strcpy(&(tar->entry_linkpath), value); 2041 } 2042 break; 2043 case 'm': 2044 if (strcmp(key, "mtime") == 0) { 2045 pax_time(value, &s, &n); 2046 archive_entry_set_mtime(entry, s, n); 2047 } 2048 break; 2049 case 'p': 2050 if (strcmp(key, "path") == 0) { 2051 archive_strcpy(&(tar->entry_pathname), value); 2052 } 2053 break; 2054 case 'r': 2055 /* POSIX has reserved 'realtime.*' */ 2056 break; 2057 case 's': 2058 /* POSIX has reserved 'security.*' */ 2059 /* Someday: if (strcmp(key, "security.acl") == 0) { ... } */ 2060 if (strcmp(key, "size") == 0) { 2061 /* "size" is the size of the data in the entry. */ 2062 tar->entry_bytes_remaining 2063 = tar_atol10(value, strlen(value)); 2064 /* 2065 * The "size" pax header keyword always overrides the 2066 * "size" field in the tar header. 2067 * GNU.sparse.realsize, GNU.sparse.size and 2068 * SCHILY.realsize override this value. 2069 */ 2070 if (!tar->realsize_override) { 2071 archive_entry_set_size(entry, 2072 tar->entry_bytes_remaining); 2073 tar->realsize 2074 = tar->entry_bytes_remaining; 2075 } 2076 } 2077 break; 2078 case 'u': 2079 if (strcmp(key, "uid") == 0) { 2080 archive_entry_set_uid(entry, 2081 tar_atol10(value, strlen(value))); 2082 } else if (strcmp(key, "uname") == 0) { 2083 archive_strcpy(&(tar->entry_uname), value); 2084 } 2085 break; 2086 } 2087 return (err); 2088 } 2089 2090 2091 2092 /* 2093 * parse a decimal time value, which may include a fractional portion 2094 */ 2095 static void 2096 pax_time(const char *p, int64_t *ps, long *pn) 2097 { 2098 char digit; 2099 int64_t s; 2100 unsigned long l; 2101 int sign; 2102 int64_t limit, last_digit_limit; 2103 2104 limit = INT64_MAX / 10; 2105 last_digit_limit = INT64_MAX % 10; 2106 2107 s = 0; 2108 sign = 1; 2109 if (*p == '-') { 2110 sign = -1; 2111 p++; 2112 } 2113 while (*p >= '0' && *p <= '9') { 2114 digit = *p - '0'; 2115 if (s > limit || 2116 (s == limit && digit > last_digit_limit)) { 2117 s = INT64_MAX; 2118 break; 2119 } 2120 s = (s * 10) + digit; 2121 ++p; 2122 } 2123 2124 *ps = s * sign; 2125 2126 /* Calculate nanoseconds. */ 2127 *pn = 0; 2128 2129 if (*p != '.') 2130 return; 2131 2132 l = 100000000UL; 2133 do { 2134 ++p; 2135 if (*p >= '0' && *p <= '9') 2136 *pn += (*p - '0') * l; 2137 else 2138 break; 2139 } while (l /= 10); 2140 } 2141 2142 /* 2143 * Parse GNU tar header 2144 */ 2145 static int 2146 header_gnutar(struct archive_read *a, struct tar *tar, 2147 struct archive_entry *entry, const void *h, size_t *unconsumed) 2148 { 2149 const struct archive_entry_header_gnutar *header; 2150 int64_t t; 2151 int err = ARCHIVE_OK; 2152 2153 /* 2154 * GNU header is like POSIX ustar, except 'prefix' is 2155 * replaced with some other fields. This also means the 2156 * filename is stored as in old-style archives. 2157 */ 2158 2159 /* Grab fields common to all tar variants. */ 2160 err = header_common(a, tar, entry, h); 2161 if (err == ARCHIVE_FATAL) 2162 return (err); 2163 2164 /* Copy filename over (to ensure null termination). */ 2165 header = (const struct archive_entry_header_gnutar *)h; 2166 if (archive_entry_copy_pathname_l(entry, 2167 header->name, sizeof(header->name), tar->sconv) != 0) { 2168 err = set_conversion_failed_error(a, tar->sconv, "Pathname"); 2169 if (err == ARCHIVE_FATAL) 2170 return (err); 2171 } 2172 2173 /* Fields common to ustar and GNU */ 2174 /* XXX Can the following be factored out since it's common 2175 * to ustar and gnu tar? Is it okay to move it down into 2176 * header_common, perhaps? */ 2177 if (archive_entry_copy_uname_l(entry, 2178 header->uname, sizeof(header->uname), tar->sconv) != 0) { 2179 err = set_conversion_failed_error(a, tar->sconv, "Uname"); 2180 if (err == ARCHIVE_FATAL) 2181 return (err); 2182 } 2183 2184 if (archive_entry_copy_gname_l(entry, 2185 header->gname, sizeof(header->gname), tar->sconv) != 0) { 2186 err = set_conversion_failed_error(a, tar->sconv, "Gname"); 2187 if (err == ARCHIVE_FATAL) 2188 return (err); 2189 } 2190 2191 /* Parse out device numbers only for char and block specials */ 2192 if (header->typeflag[0] == '3' || header->typeflag[0] == '4') { 2193 archive_entry_set_rdevmajor(entry, (dev_t) 2194 tar_atol(header->rdevmajor, sizeof(header->rdevmajor))); 2195 archive_entry_set_rdevminor(entry, (dev_t) 2196 tar_atol(header->rdevminor, sizeof(header->rdevminor))); 2197 } else 2198 archive_entry_set_rdev(entry, 0); 2199 2200 tar->entry_padding = 0x1ff & (-tar->entry_bytes_remaining); 2201 2202 /* Grab GNU-specific fields. */ 2203 t = tar_atol(header->atime, sizeof(header->atime)); 2204 if (t > 0) 2205 archive_entry_set_atime(entry, t, 0); 2206 t = tar_atol(header->ctime, sizeof(header->ctime)); 2207 if (t > 0) 2208 archive_entry_set_ctime(entry, t, 0); 2209 2210 if (header->realsize[0] != 0) { 2211 tar->realsize 2212 = tar_atol(header->realsize, sizeof(header->realsize)); 2213 archive_entry_set_size(entry, tar->realsize); 2214 tar->realsize_override = 1; 2215 } 2216 2217 if (header->sparse[0].offset[0] != 0) { 2218 if (gnu_sparse_old_read(a, tar, header, unconsumed) 2219 != ARCHIVE_OK) 2220 return (ARCHIVE_FATAL); 2221 } else { 2222 if (header->isextended[0] != 0) { 2223 /* XXX WTF? XXX */ 2224 } 2225 } 2226 2227 return (err); 2228 } 2229 2230 static int 2231 gnu_add_sparse_entry(struct archive_read *a, struct tar *tar, 2232 int64_t offset, int64_t remaining) 2233 { 2234 struct sparse_block *p; 2235 2236 p = (struct sparse_block *)calloc(1, sizeof(*p)); 2237 if (p == NULL) { 2238 archive_set_error(&a->archive, ENOMEM, "Out of memory"); 2239 return (ARCHIVE_FATAL); 2240 } 2241 if (tar->sparse_last != NULL) 2242 tar->sparse_last->next = p; 2243 else 2244 tar->sparse_list = p; 2245 tar->sparse_last = p; 2246 if (remaining < 0 || offset < 0) { 2247 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, "Malformed sparse map data"); 2248 return (ARCHIVE_FATAL); 2249 } 2250 p->offset = offset; 2251 p->remaining = remaining; 2252 return (ARCHIVE_OK); 2253 } 2254 2255 static void 2256 gnu_clear_sparse_list(struct tar *tar) 2257 { 2258 struct sparse_block *p; 2259 2260 while (tar->sparse_list != NULL) { 2261 p = tar->sparse_list; 2262 tar->sparse_list = p->next; 2263 free(p); 2264 } 2265 tar->sparse_last = NULL; 2266 } 2267 2268 /* 2269 * GNU tar old-format sparse data. 2270 * 2271 * GNU old-format sparse data is stored in a fixed-field 2272 * format. Offset/size values are 11-byte octal fields (same 2273 * format as 'size' field in ustart header). These are 2274 * stored in the header, allocating subsequent header blocks 2275 * as needed. Extending the header in this way is a pretty 2276 * severe POSIX violation; this design has earned GNU tar a 2277 * lot of criticism. 2278 */ 2279 2280 static int 2281 gnu_sparse_old_read(struct archive_read *a, struct tar *tar, 2282 const struct archive_entry_header_gnutar *header, size_t *unconsumed) 2283 { 2284 ssize_t bytes_read; 2285 const void *data; 2286 struct extended { 2287 struct gnu_sparse sparse[21]; 2288 char isextended[1]; 2289 char padding[7]; 2290 }; 2291 const struct extended *ext; 2292 2293 if (gnu_sparse_old_parse(a, tar, header->sparse, 4) != ARCHIVE_OK) 2294 return (ARCHIVE_FATAL); 2295 if (header->isextended[0] == 0) 2296 return (ARCHIVE_OK); 2297 2298 do { 2299 tar_flush_unconsumed(a, unconsumed); 2300 data = __archive_read_ahead(a, 512, &bytes_read); 2301 if (bytes_read < 0) 2302 return (ARCHIVE_FATAL); 2303 if (bytes_read < 512) { 2304 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 2305 "Truncated tar archive " 2306 "detected while reading sparse file data"); 2307 return (ARCHIVE_FATAL); 2308 } 2309 *unconsumed = 512; 2310 ext = (const struct extended *)data; 2311 if (gnu_sparse_old_parse(a, tar, ext->sparse, 21) != ARCHIVE_OK) 2312 return (ARCHIVE_FATAL); 2313 } while (ext->isextended[0] != 0); 2314 if (tar->sparse_list != NULL) 2315 tar->entry_offset = tar->sparse_list->offset; 2316 return (ARCHIVE_OK); 2317 } 2318 2319 static int 2320 gnu_sparse_old_parse(struct archive_read *a, struct tar *tar, 2321 const struct gnu_sparse *sparse, int length) 2322 { 2323 while (length > 0 && sparse->offset[0] != 0) { 2324 if (gnu_add_sparse_entry(a, tar, 2325 tar_atol(sparse->offset, sizeof(sparse->offset)), 2326 tar_atol(sparse->numbytes, sizeof(sparse->numbytes))) 2327 != ARCHIVE_OK) 2328 return (ARCHIVE_FATAL); 2329 sparse++; 2330 length--; 2331 } 2332 return (ARCHIVE_OK); 2333 } 2334 2335 /* 2336 * GNU tar sparse format 0.0 2337 * 2338 * Beginning with GNU tar 1.15, sparse files are stored using 2339 * information in the pax extended header. The GNU tar maintainers 2340 * have gone through a number of variations in the process of working 2341 * out this scheme; fortunately, they're all numbered. 2342 * 2343 * Sparse format 0.0 uses attribute GNU.sparse.numblocks to store the 2344 * number of blocks, and GNU.sparse.offset/GNU.sparse.numbytes to 2345 * store offset/size for each block. The repeated instances of these 2346 * latter fields violate the pax specification (which frowns on 2347 * duplicate keys), so this format was quickly replaced. 2348 */ 2349 2350 /* 2351 * GNU tar sparse format 0.1 2352 * 2353 * This version replaced the offset/numbytes attributes with 2354 * a single "map" attribute that stored a list of integers. This 2355 * format had two problems: First, the "map" attribute could be very 2356 * long, which caused problems for some implementations. More 2357 * importantly, the sparse data was lost when extracted by archivers 2358 * that didn't recognize this extension. 2359 */ 2360 2361 static int 2362 gnu_sparse_01_parse(struct archive_read *a, struct tar *tar, const char *p) 2363 { 2364 const char *e; 2365 int64_t offset = -1, size = -1; 2366 2367 for (;;) { 2368 e = p; 2369 while (*e != '\0' && *e != ',') { 2370 if (*e < '0' || *e > '9') 2371 return (ARCHIVE_WARN); 2372 e++; 2373 } 2374 if (offset < 0) { 2375 offset = tar_atol10(p, e - p); 2376 if (offset < 0) 2377 return (ARCHIVE_WARN); 2378 } else { 2379 size = tar_atol10(p, e - p); 2380 if (size < 0) 2381 return (ARCHIVE_WARN); 2382 if (gnu_add_sparse_entry(a, tar, offset, size) 2383 != ARCHIVE_OK) 2384 return (ARCHIVE_FATAL); 2385 offset = -1; 2386 } 2387 if (*e == '\0') 2388 return (ARCHIVE_OK); 2389 p = e + 1; 2390 } 2391 } 2392 2393 /* 2394 * GNU tar sparse format 1.0 2395 * 2396 * The idea: The offset/size data is stored as a series of base-10 2397 * ASCII numbers prepended to the file data, so that dearchivers that 2398 * don't support this format will extract the block map along with the 2399 * data and a separate post-process can restore the sparseness. 2400 * 2401 * Unfortunately, GNU tar 1.16 had a bug that added unnecessary 2402 * padding to the body of the file when using this format. GNU tar 2403 * 1.17 corrected this bug without bumping the version number, so 2404 * it's not possible to support both variants. This code supports 2405 * the later variant at the expense of not supporting the former. 2406 * 2407 * This variant also replaced GNU.sparse.size with GNU.sparse.realsize 2408 * and introduced the GNU.sparse.major/GNU.sparse.minor attributes. 2409 */ 2410 2411 /* 2412 * Read the next line from the input, and parse it as a decimal 2413 * integer followed by '\n'. Returns positive integer value or 2414 * negative on error. 2415 */ 2416 static int64_t 2417 gnu_sparse_10_atol(struct archive_read *a, struct tar *tar, 2418 int64_t *remaining, size_t *unconsumed) 2419 { 2420 int64_t l, limit, last_digit_limit; 2421 const char *p; 2422 ssize_t bytes_read; 2423 int base, digit; 2424 2425 base = 10; 2426 limit = INT64_MAX / base; 2427 last_digit_limit = INT64_MAX % base; 2428 2429 /* 2430 * Skip any lines starting with '#'; GNU tar specs 2431 * don't require this, but they should. 2432 */ 2433 do { 2434 bytes_read = readline(a, tar, &p, 2435 (ssize_t)tar_min(*remaining, 100), unconsumed); 2436 if (bytes_read <= 0) 2437 return (ARCHIVE_FATAL); 2438 *remaining -= bytes_read; 2439 } while (p[0] == '#'); 2440 2441 l = 0; 2442 while (bytes_read > 0) { 2443 if (*p == '\n') 2444 return (l); 2445 if (*p < '0' || *p >= '0' + base) 2446 return (ARCHIVE_WARN); 2447 digit = *p - '0'; 2448 if (l > limit || (l == limit && digit > last_digit_limit)) 2449 l = INT64_MAX; /* Truncate on overflow. */ 2450 else 2451 l = (l * base) + digit; 2452 p++; 2453 bytes_read--; 2454 } 2455 /* TODO: Error message. */ 2456 return (ARCHIVE_WARN); 2457 } 2458 2459 /* 2460 * Returns length (in bytes) of the sparse data description 2461 * that was read. 2462 */ 2463 static ssize_t 2464 gnu_sparse_10_read(struct archive_read *a, struct tar *tar, size_t *unconsumed) 2465 { 2466 ssize_t bytes_read; 2467 int entries; 2468 int64_t offset, size, to_skip, remaining; 2469 2470 /* Clear out the existing sparse list. */ 2471 gnu_clear_sparse_list(tar); 2472 2473 remaining = tar->entry_bytes_remaining; 2474 2475 /* Parse entries. */ 2476 entries = (int)gnu_sparse_10_atol(a, tar, &remaining, unconsumed); 2477 if (entries < 0) 2478 return (ARCHIVE_FATAL); 2479 /* Parse the individual entries. */ 2480 while (entries-- > 0) { 2481 /* Parse offset/size */ 2482 offset = gnu_sparse_10_atol(a, tar, &remaining, unconsumed); 2483 if (offset < 0) 2484 return (ARCHIVE_FATAL); 2485 size = gnu_sparse_10_atol(a, tar, &remaining, unconsumed); 2486 if (size < 0) 2487 return (ARCHIVE_FATAL); 2488 /* Add a new sparse entry. */ 2489 if (gnu_add_sparse_entry(a, tar, offset, size) != ARCHIVE_OK) 2490 return (ARCHIVE_FATAL); 2491 } 2492 /* Skip rest of block... */ 2493 tar_flush_unconsumed(a, unconsumed); 2494 bytes_read = (ssize_t)(tar->entry_bytes_remaining - remaining); 2495 to_skip = 0x1ff & -bytes_read; 2496 /* Fail if tar->entry_bytes_remaing would get negative */ 2497 if (to_skip > remaining) 2498 return (ARCHIVE_FATAL); 2499 if (to_skip != __archive_read_consume(a, to_skip)) 2500 return (ARCHIVE_FATAL); 2501 return ((ssize_t)(bytes_read + to_skip)); 2502 } 2503 2504 /* 2505 * Solaris pax extension for a sparse file. This is recorded with the 2506 * data and hole pairs. The way recording sparse information by Solaris' 2507 * pax simply indicates where data and sparse are, so the stored contents 2508 * consist of both data and hole. 2509 */ 2510 static int 2511 solaris_sparse_parse(struct archive_read *a, struct tar *tar, 2512 struct archive_entry *entry, const char *p) 2513 { 2514 const char *e; 2515 int64_t start, end; 2516 int hole = 1; 2517 2518 (void)entry; /* UNUSED */ 2519 2520 end = 0; 2521 if (*p == ' ') 2522 p++; 2523 else 2524 return (ARCHIVE_WARN); 2525 for (;;) { 2526 e = p; 2527 while (*e != '\0' && *e != ' ') { 2528 if (*e < '0' || *e > '9') 2529 return (ARCHIVE_WARN); 2530 e++; 2531 } 2532 start = end; 2533 end = tar_atol10(p, e - p); 2534 if (end < 0) 2535 return (ARCHIVE_WARN); 2536 if (start < end) { 2537 if (gnu_add_sparse_entry(a, tar, start, 2538 end - start) != ARCHIVE_OK) 2539 return (ARCHIVE_FATAL); 2540 tar->sparse_last->hole = hole; 2541 } 2542 if (*e == '\0') 2543 return (ARCHIVE_OK); 2544 p = e + 1; 2545 hole = hole == 0; 2546 } 2547 } 2548 2549 /*- 2550 * Convert text->integer. 2551 * 2552 * Traditional tar formats (including POSIX) specify base-8 for 2553 * all of the standard numeric fields. This is a significant limitation 2554 * in practice: 2555 * = file size is limited to 8GB 2556 * = rdevmajor and rdevminor are limited to 21 bits 2557 * = uid/gid are limited to 21 bits 2558 * 2559 * There are two workarounds for this: 2560 * = pax extended headers, which use variable-length string fields 2561 * = GNU tar and STAR both allow either base-8 or base-256 in 2562 * most fields. The high bit is set to indicate base-256. 2563 * 2564 * On read, this implementation supports both extensions. 2565 */ 2566 static int64_t 2567 tar_atol(const char *p, size_t char_cnt) 2568 { 2569 /* 2570 * Technically, GNU tar considers a field to be in base-256 2571 * only if the first byte is 0xff or 0x80. 2572 */ 2573 if (*p & 0x80) 2574 return (tar_atol256(p, char_cnt)); 2575 return (tar_atol8(p, char_cnt)); 2576 } 2577 2578 /* 2579 * Note that this implementation does not (and should not!) obey 2580 * locale settings; you cannot simply substitute strtol here, since 2581 * it does obey locale. 2582 */ 2583 static int64_t 2584 tar_atol_base_n(const char *p, size_t char_cnt, int base) 2585 { 2586 int64_t l, maxval, limit, last_digit_limit; 2587 int digit, sign; 2588 2589 maxval = INT64_MAX; 2590 limit = INT64_MAX / base; 2591 last_digit_limit = INT64_MAX % base; 2592 2593 /* the pointer will not be dereferenced if char_cnt is zero 2594 * due to the way the && operator is evaluated. 2595 */ 2596 while (char_cnt != 0 && (*p == ' ' || *p == '\t')) { 2597 p++; 2598 char_cnt--; 2599 } 2600 2601 sign = 1; 2602 if (char_cnt != 0 && *p == '-') { 2603 sign = -1; 2604 p++; 2605 char_cnt--; 2606 2607 maxval = INT64_MIN; 2608 limit = -(INT64_MIN / base); 2609 last_digit_limit = INT64_MIN % base; 2610 } 2611 2612 l = 0; 2613 if (char_cnt != 0) { 2614 digit = *p - '0'; 2615 while (digit >= 0 && digit < base && char_cnt != 0) { 2616 if (l>limit || (l == limit && digit > last_digit_limit)) { 2617 return maxval; /* Truncate on overflow. */ 2618 } 2619 l = (l * base) + digit; 2620 digit = *++p - '0'; 2621 char_cnt--; 2622 } 2623 } 2624 return (sign < 0) ? -l : l; 2625 } 2626 2627 static int64_t 2628 tar_atol8(const char *p, size_t char_cnt) 2629 { 2630 return tar_atol_base_n(p, char_cnt, 8); 2631 } 2632 2633 static int64_t 2634 tar_atol10(const char *p, size_t char_cnt) 2635 { 2636 return tar_atol_base_n(p, char_cnt, 10); 2637 } 2638 2639 /* 2640 * Parse a base-256 integer. This is just a variable-length 2641 * twos-complement signed binary value in big-endian order, except 2642 * that the high-order bit is ignored. The values here can be up to 2643 * 12 bytes, so we need to be careful about overflowing 64-bit 2644 * (8-byte) integers. 2645 * 2646 * This code unashamedly assumes that the local machine uses 8-bit 2647 * bytes and twos-complement arithmetic. 2648 */ 2649 static int64_t 2650 tar_atol256(const char *_p, size_t char_cnt) 2651 { 2652 uint64_t l; 2653 const unsigned char *p = (const unsigned char *)_p; 2654 unsigned char c, neg; 2655 2656 /* Extend 7-bit 2s-comp to 8-bit 2s-comp, decide sign. */ 2657 c = *p; 2658 if (c & 0x40) { 2659 neg = 0xff; 2660 c |= 0x80; 2661 l = ~ARCHIVE_LITERAL_ULL(0); 2662 } else { 2663 neg = 0; 2664 c &= 0x7f; 2665 l = 0; 2666 } 2667 2668 /* If more than 8 bytes, check that we can ignore 2669 * high-order bits without overflow. */ 2670 while (char_cnt > sizeof(int64_t)) { 2671 --char_cnt; 2672 if (c != neg) 2673 return neg ? INT64_MIN : INT64_MAX; 2674 c = *++p; 2675 } 2676 2677 /* c is first byte that fits; if sign mismatch, return overflow */ 2678 if ((c ^ neg) & 0x80) { 2679 return neg ? INT64_MIN : INT64_MAX; 2680 } 2681 2682 /* Accumulate remaining bytes. */ 2683 while (--char_cnt > 0) { 2684 l = (l << 8) | c; 2685 c = *++p; 2686 } 2687 l = (l << 8) | c; 2688 /* Return signed twos-complement value. */ 2689 return (int64_t)(l); 2690 } 2691 2692 /* 2693 * Returns length of line (including trailing newline) 2694 * or negative on error. 'start' argument is updated to 2695 * point to first character of line. This avoids copying 2696 * when possible. 2697 */ 2698 static ssize_t 2699 readline(struct archive_read *a, struct tar *tar, const char **start, 2700 ssize_t limit, size_t *unconsumed) 2701 { 2702 ssize_t bytes_read; 2703 ssize_t total_size = 0; 2704 const void *t; 2705 const char *s; 2706 void *p; 2707 2708 tar_flush_unconsumed(a, unconsumed); 2709 2710 t = __archive_read_ahead(a, 1, &bytes_read); 2711 if (bytes_read <= 0) 2712 return (ARCHIVE_FATAL); 2713 s = t; /* Start of line? */ 2714 p = memchr(t, '\n', bytes_read); 2715 /* If we found '\n' in the read buffer, return pointer to that. */ 2716 if (p != NULL) { 2717 bytes_read = 1 + ((const char *)p) - s; 2718 if (bytes_read > limit) { 2719 archive_set_error(&a->archive, 2720 ARCHIVE_ERRNO_FILE_FORMAT, 2721 "Line too long"); 2722 return (ARCHIVE_FATAL); 2723 } 2724 *unconsumed = bytes_read; 2725 *start = s; 2726 return (bytes_read); 2727 } 2728 *unconsumed = bytes_read; 2729 /* Otherwise, we need to accumulate in a line buffer. */ 2730 for (;;) { 2731 if (total_size + bytes_read > limit) { 2732 archive_set_error(&a->archive, 2733 ARCHIVE_ERRNO_FILE_FORMAT, 2734 "Line too long"); 2735 return (ARCHIVE_FATAL); 2736 } 2737 if (archive_string_ensure(&tar->line, total_size + bytes_read) == NULL) { 2738 archive_set_error(&a->archive, ENOMEM, 2739 "Can't allocate working buffer"); 2740 return (ARCHIVE_FATAL); 2741 } 2742 memcpy(tar->line.s + total_size, t, bytes_read); 2743 tar_flush_unconsumed(a, unconsumed); 2744 total_size += bytes_read; 2745 /* If we found '\n', clean up and return. */ 2746 if (p != NULL) { 2747 *start = tar->line.s; 2748 return (total_size); 2749 } 2750 /* Read some more. */ 2751 t = __archive_read_ahead(a, 1, &bytes_read); 2752 if (bytes_read <= 0) 2753 return (ARCHIVE_FATAL); 2754 s = t; /* Start of line? */ 2755 p = memchr(t, '\n', bytes_read); 2756 /* If we found '\n', trim the read. */ 2757 if (p != NULL) { 2758 bytes_read = 1 + ((const char *)p) - s; 2759 } 2760 *unconsumed = bytes_read; 2761 } 2762 } 2763 2764 /* 2765 * base64_decode - Base64 decode 2766 * 2767 * This accepts most variations of base-64 encoding, including: 2768 * * with or without line breaks 2769 * * with or without the final group padded with '=' or '_' characters 2770 * (The most economical Base-64 variant does not pad the last group and 2771 * omits line breaks; RFC1341 used for MIME requires both.) 2772 */ 2773 static char * 2774 base64_decode(const char *s, size_t len, size_t *out_len) 2775 { 2776 static const unsigned char digits[64] = { 2777 'A','B','C','D','E','F','G','H','I','J','K','L','M','N', 2778 'O','P','Q','R','S','T','U','V','W','X','Y','Z','a','b', 2779 'c','d','e','f','g','h','i','j','k','l','m','n','o','p', 2780 'q','r','s','t','u','v','w','x','y','z','0','1','2','3', 2781 '4','5','6','7','8','9','+','/' }; 2782 static unsigned char decode_table[128]; 2783 char *out, *d; 2784 const unsigned char *src = (const unsigned char *)s; 2785 2786 /* If the decode table is not yet initialized, prepare it. */ 2787 if (decode_table[digits[1]] != 1) { 2788 unsigned i; 2789 memset(decode_table, 0xff, sizeof(decode_table)); 2790 for (i = 0; i < sizeof(digits); i++) 2791 decode_table[digits[i]] = i; 2792 } 2793 2794 /* Allocate enough space to hold the entire output. */ 2795 /* Note that we may not use all of this... */ 2796 out = (char *)malloc(len - len / 4 + 1); 2797 if (out == NULL) { 2798 *out_len = 0; 2799 return (NULL); 2800 } 2801 d = out; 2802 2803 while (len > 0) { 2804 /* Collect the next group of (up to) four characters. */ 2805 int v = 0; 2806 int group_size = 0; 2807 while (group_size < 4 && len > 0) { 2808 /* '=' or '_' padding indicates final group. */ 2809 if (*src == '=' || *src == '_') { 2810 len = 0; 2811 break; 2812 } 2813 /* Skip illegal characters (including line breaks) */ 2814 if (*src > 127 || *src < 32 2815 || decode_table[*src] == 0xff) { 2816 len--; 2817 src++; 2818 continue; 2819 } 2820 v <<= 6; 2821 v |= decode_table[*src++]; 2822 len --; 2823 group_size++; 2824 } 2825 /* Align a short group properly. */ 2826 v <<= 6 * (4 - group_size); 2827 /* Unpack the group we just collected. */ 2828 switch (group_size) { 2829 case 4: d[2] = v & 0xff; 2830 /* FALLTHROUGH */ 2831 case 3: d[1] = (v >> 8) & 0xff; 2832 /* FALLTHROUGH */ 2833 case 2: d[0] = (v >> 16) & 0xff; 2834 break; 2835 case 1: /* this is invalid! */ 2836 break; 2837 } 2838 d += group_size * 3 / 4; 2839 } 2840 2841 *out_len = d - out; 2842 return (out); 2843 } 2844 2845 static char * 2846 url_decode(const char *in) 2847 { 2848 char *out, *d; 2849 const char *s; 2850 2851 out = (char *)malloc(strlen(in) + 1); 2852 if (out == NULL) 2853 return (NULL); 2854 for (s = in, d = out; *s != '\0'; ) { 2855 if (s[0] == '%' && s[1] != '\0' && s[2] != '\0') { 2856 /* Try to convert % escape */ 2857 int digit1 = tohex(s[1]); 2858 int digit2 = tohex(s[2]); 2859 if (digit1 >= 0 && digit2 >= 0) { 2860 /* Looks good, consume three chars */ 2861 s += 3; 2862 /* Convert output */ 2863 *d++ = ((digit1 << 4) | digit2); 2864 continue; 2865 } 2866 /* Else fall through and treat '%' as normal char */ 2867 } 2868 *d++ = *s++; 2869 } 2870 *d = '\0'; 2871 return (out); 2872 } 2873 2874 static int 2875 tohex(int c) 2876 { 2877 if (c >= '0' && c <= '9') 2878 return (c - '0'); 2879 else if (c >= 'A' && c <= 'F') 2880 return (c - 'A' + 10); 2881 else if (c >= 'a' && c <= 'f') 2882 return (c - 'a' + 10); 2883 else 2884 return (-1); 2885 } 2886