archive_read_support_format_tar.c revision 348607
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: stable/11/contrib/libarchive/libarchive/archive_read_support_format_tar.c 348607 2019-06-04 10:35:54Z mm $"); 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 */ 54struct 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 */ 76struct gnu_sparse { 77 char offset[12]; 78 char numbytes[12]; 79}; 80 81struct 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 */ 113struct sparse_block { 114 struct sparse_block *next; 115 int64_t offset; 116 int64_t remaining; 117 int hole; 118}; 119 120struct 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 161static int archive_block_is_null(const char *p); 162static char *base64_decode(const char *, size_t, size_t *); 163static int gnu_add_sparse_entry(struct archive_read *, struct tar *, 164 int64_t offset, int64_t remaining); 165 166static void gnu_clear_sparse_list(struct tar *); 167static int gnu_sparse_old_read(struct archive_read *, struct tar *, 168 const struct archive_entry_header_gnutar *header, size_t *); 169static int gnu_sparse_old_parse(struct archive_read *, struct tar *, 170 const struct gnu_sparse *sparse, int length); 171static int gnu_sparse_01_parse(struct archive_read *, struct tar *, 172 const char *); 173static ssize_t gnu_sparse_10_read(struct archive_read *, struct tar *, 174 size_t *); 175static int header_Solaris_ACL(struct archive_read *, struct tar *, 176 struct archive_entry *, const void *, size_t *); 177static int header_common(struct archive_read *, struct tar *, 178 struct archive_entry *, const void *); 179static int header_old_tar(struct archive_read *, struct tar *, 180 struct archive_entry *, const void *); 181static int header_pax_extensions(struct archive_read *, struct tar *, 182 struct archive_entry *, const void *, size_t *); 183static int header_pax_global(struct archive_read *, struct tar *, 184 struct archive_entry *, const void *h, size_t *); 185static int header_longlink(struct archive_read *, struct tar *, 186 struct archive_entry *, const void *h, size_t *); 187static int header_longname(struct archive_read *, struct tar *, 188 struct archive_entry *, const void *h, size_t *); 189static int read_mac_metadata_blob(struct archive_read *, struct tar *, 190 struct archive_entry *, const void *h, size_t *); 191static int header_volume(struct archive_read *, struct tar *, 192 struct archive_entry *, const void *h, size_t *); 193static int header_ustar(struct archive_read *, struct tar *, 194 struct archive_entry *, const void *h); 195static int header_gnutar(struct archive_read *, struct tar *, 196 struct archive_entry *, const void *h, size_t *); 197static int archive_read_format_tar_bid(struct archive_read *, int); 198static int archive_read_format_tar_options(struct archive_read *, 199 const char *, const char *); 200static int archive_read_format_tar_cleanup(struct archive_read *); 201static int archive_read_format_tar_read_data(struct archive_read *a, 202 const void **buff, size_t *size, int64_t *offset); 203static int archive_read_format_tar_skip(struct archive_read *a); 204static int archive_read_format_tar_read_header(struct archive_read *, 205 struct archive_entry *); 206static int checksum(struct archive_read *, const void *); 207static int pax_attribute(struct archive_read *, struct tar *, 208 struct archive_entry *, const char *key, const char *value, 209 size_t value_length); 210static int pax_attribute_acl(struct archive_read *, struct tar *, 211 struct archive_entry *, const char *, int); 212static int pax_attribute_xattr(struct archive_entry *, const char *, 213 const char *); 214static int pax_header(struct archive_read *, struct tar *, 215 struct archive_entry *, struct archive_string *); 216static void pax_time(const char *, int64_t *sec, long *nanos); 217static ssize_t readline(struct archive_read *, struct tar *, const char **, 218 ssize_t limit, size_t *); 219static int read_body_to_string(struct archive_read *, struct tar *, 220 struct archive_string *, const void *h, size_t *); 221static int solaris_sparse_parse(struct archive_read *, struct tar *, 222 struct archive_entry *, const char *); 223static int64_t tar_atol(const char *, size_t); 224static int64_t tar_atol10(const char *, size_t); 225static int64_t tar_atol256(const char *, size_t); 226static int64_t tar_atol8(const char *, size_t); 227static int tar_read_header(struct archive_read *, struct tar *, 228 struct archive_entry *, size_t *); 229static int tohex(int c); 230static char *url_decode(const char *); 231static void tar_flush_unconsumed(struct archive_read *, size_t *); 232 233 234int 235archive_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 243int 244archive_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 if (tar == NULL) { 255 archive_set_error(&a->archive, ENOMEM, 256 "Can't allocate tar data"); 257 return (ARCHIVE_FATAL); 258 } 259#ifdef HAVE_COPYFILE_H 260 /* Set this by default on Mac OS. */ 261 tar->process_mac_extensions = 1; 262#endif 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 280static int 281archive_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 */ 327static int 328validate_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 356static int 357archive_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 424static int 425archive_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 */ 469static void 470tar_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 */ 492static int 493archive_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 587static int 588archive_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 650static int 651archive_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 */ 692static int 693tar_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, eof_vol_header; 698 const char *h; 699 const struct archive_entry_header_ustar *header; 700 const struct archive_entry_header_gnutar *gnuheader; 701 702 eof_vol_header = 0; 703 704 /* Loop until we find a workable header record. */ 705 for (;;) { 706 tar_flush_unconsumed(a, unconsumed); 707 708 /* Read 512-byte header record */ 709 h = __archive_read_ahead(a, 512, &bytes); 710 if (bytes < 0) 711 return ((int)bytes); 712 if (bytes == 0) { /* EOF at a block boundary. */ 713 /* Some writers do omit the block of nulls. <sigh> */ 714 return (ARCHIVE_EOF); 715 } 716 if (bytes < 512) { /* Short block at EOF; this is bad. */ 717 archive_set_error(&a->archive, 718 ARCHIVE_ERRNO_FILE_FORMAT, 719 "Truncated tar archive"); 720 return (ARCHIVE_FATAL); 721 } 722 *unconsumed = 512; 723 724 /* Header is workable if it's not an end-of-archive mark. */ 725 if (h[0] != 0 || !archive_block_is_null(h)) 726 break; 727 728 /* Ensure format is set for archives with only null blocks. */ 729 if (a->archive.archive_format_name == NULL) { 730 a->archive.archive_format = ARCHIVE_FORMAT_TAR; 731 a->archive.archive_format_name = "tar"; 732 } 733 734 if (!tar->read_concatenated_archives) { 735 /* Try to consume a second all-null record, as well. */ 736 tar_flush_unconsumed(a, unconsumed); 737 h = __archive_read_ahead(a, 512, NULL); 738 if (h != NULL && h[0] == 0 && archive_block_is_null(h)) 739 __archive_read_consume(a, 512); 740 archive_clear_error(&a->archive); 741 return (ARCHIVE_EOF); 742 } 743 744 /* 745 * We're reading concatenated archives, ignore this block and 746 * loop to get the next. 747 */ 748 } 749 750 /* 751 * Note: If the checksum fails and we return ARCHIVE_RETRY, 752 * then the client is likely to just retry. This is a very 753 * crude way to search for the next valid header! 754 * 755 * TODO: Improve this by implementing a real header scan. 756 */ 757 if (!checksum(a, h)) { 758 tar_flush_unconsumed(a, unconsumed); 759 archive_set_error(&a->archive, EINVAL, "Damaged tar archive"); 760 return (ARCHIVE_RETRY); /* Retryable: Invalid header */ 761 } 762 763 if (++tar->header_recursion_depth > 32) { 764 tar_flush_unconsumed(a, unconsumed); 765 archive_set_error(&a->archive, EINVAL, "Too many special headers"); 766 return (ARCHIVE_WARN); 767 } 768 769 /* Determine the format variant. */ 770 header = (const struct archive_entry_header_ustar *)h; 771 772 switch(header->typeflag[0]) { 773 case 'A': /* Solaris tar ACL */ 774 a->archive.archive_format = ARCHIVE_FORMAT_TAR_PAX_INTERCHANGE; 775 a->archive.archive_format_name = "Solaris tar"; 776 err = header_Solaris_ACL(a, tar, entry, h, unconsumed); 777 break; 778 case 'g': /* POSIX-standard 'g' header. */ 779 a->archive.archive_format = ARCHIVE_FORMAT_TAR_PAX_INTERCHANGE; 780 a->archive.archive_format_name = "POSIX pax interchange format"; 781 err = header_pax_global(a, tar, entry, h, unconsumed); 782 if (err == ARCHIVE_EOF) 783 return (err); 784 break; 785 case 'K': /* Long link name (GNU tar, others) */ 786 err = header_longlink(a, tar, entry, h, unconsumed); 787 break; 788 case 'L': /* Long filename (GNU tar, others) */ 789 err = header_longname(a, tar, entry, h, unconsumed); 790 break; 791 case 'V': /* GNU volume header */ 792 err = header_volume(a, tar, entry, h, unconsumed); 793 if (err == ARCHIVE_EOF) 794 eof_vol_header = 1; 795 break; 796 case 'X': /* Used by SUN tar; same as 'x'. */ 797 a->archive.archive_format = ARCHIVE_FORMAT_TAR_PAX_INTERCHANGE; 798 a->archive.archive_format_name = 799 "POSIX pax interchange format (Sun variant)"; 800 err = header_pax_extensions(a, tar, entry, h, unconsumed); 801 break; 802 case 'x': /* POSIX-standard 'x' header. */ 803 a->archive.archive_format = ARCHIVE_FORMAT_TAR_PAX_INTERCHANGE; 804 a->archive.archive_format_name = "POSIX pax interchange format"; 805 err = header_pax_extensions(a, tar, entry, h, unconsumed); 806 break; 807 default: 808 gnuheader = (const struct archive_entry_header_gnutar *)h; 809 if (memcmp(gnuheader->magic, "ustar \0", 8) == 0) { 810 a->archive.archive_format = ARCHIVE_FORMAT_TAR_GNUTAR; 811 a->archive.archive_format_name = "GNU tar format"; 812 err = header_gnutar(a, tar, entry, h, unconsumed); 813 } else if (memcmp(header->magic, "ustar", 5) == 0) { 814 if (a->archive.archive_format != ARCHIVE_FORMAT_TAR_PAX_INTERCHANGE) { 815 a->archive.archive_format = ARCHIVE_FORMAT_TAR_USTAR; 816 a->archive.archive_format_name = "POSIX ustar format"; 817 } 818 err = header_ustar(a, tar, entry, h); 819 } else { 820 a->archive.archive_format = ARCHIVE_FORMAT_TAR; 821 a->archive.archive_format_name = "tar (non-POSIX)"; 822 err = header_old_tar(a, tar, entry, h); 823 } 824 } 825 if (err == ARCHIVE_FATAL) 826 return (err); 827 828 tar_flush_unconsumed(a, unconsumed); 829 830 h = NULL; 831 header = NULL; 832 833 --tar->header_recursion_depth; 834 /* Yuck. Apple's design here ends up storing long pathname 835 * extensions for both the AppleDouble extension entry and the 836 * regular entry. 837 */ 838 if ((err == ARCHIVE_WARN || err == ARCHIVE_OK) && 839 tar->header_recursion_depth == 0 && 840 tar->process_mac_extensions) { 841 int err2 = read_mac_metadata_blob(a, tar, entry, h, unconsumed); 842 if (err2 < err) 843 err = err2; 844 } 845 846 /* We return warnings or success as-is. Anything else is fatal. */ 847 if (err == ARCHIVE_WARN || err == ARCHIVE_OK) { 848 if (tar->sparse_gnu_pending) { 849 if (tar->sparse_gnu_major == 1 && 850 tar->sparse_gnu_minor == 0) { 851 ssize_t bytes_read; 852 853 tar->sparse_gnu_pending = 0; 854 /* Read initial sparse map. */ 855 bytes_read = gnu_sparse_10_read(a, tar, unconsumed); 856 if (bytes_read < 0) 857 return ((int)bytes_read); 858 tar->entry_bytes_remaining -= bytes_read; 859 } else { 860 archive_set_error(&a->archive, 861 ARCHIVE_ERRNO_MISC, 862 "Unrecognized GNU sparse file format"); 863 return (ARCHIVE_WARN); 864 } 865 tar->sparse_gnu_pending = 0; 866 } 867 return (err); 868 } 869 if (err == ARCHIVE_EOF) { 870 if (!eof_vol_header) { 871 /* EOF when recursively reading a header is bad. */ 872 archive_set_error(&a->archive, EINVAL, 873 "Damaged tar archive"); 874 } else { 875 /* If we encounter just a GNU volume header treat 876 * this situation as an empty archive */ 877 return (ARCHIVE_EOF); 878 } 879 } 880 return (ARCHIVE_FATAL); 881} 882 883/* 884 * Return true if block checksum is correct. 885 */ 886static int 887checksum(struct archive_read *a, const void *h) 888{ 889 const unsigned char *bytes; 890 const struct archive_entry_header_ustar *header; 891 int check, sum; 892 size_t i; 893 894 (void)a; /* UNUSED */ 895 bytes = (const unsigned char *)h; 896 header = (const struct archive_entry_header_ustar *)h; 897 898 /* Checksum field must hold an octal number */ 899 for (i = 0; i < sizeof(header->checksum); ++i) { 900 char c = header->checksum[i]; 901 if (c != ' ' && c != '\0' && (c < '0' || c > '7')) 902 return 0; 903 } 904 905 /* 906 * Test the checksum. Note that POSIX specifies _unsigned_ 907 * bytes for this calculation. 908 */ 909 sum = (int)tar_atol(header->checksum, sizeof(header->checksum)); 910 check = 0; 911 for (i = 0; i < 148; i++) 912 check += (unsigned char)bytes[i]; 913 for (; i < 156; i++) 914 check += 32; 915 for (; i < 512; i++) 916 check += (unsigned char)bytes[i]; 917 if (sum == check) 918 return (1); 919 920 /* 921 * Repeat test with _signed_ bytes, just in case this archive 922 * was created by an old BSD, Solaris, or HP-UX tar with a 923 * broken checksum calculation. 924 */ 925 check = 0; 926 for (i = 0; i < 148; i++) 927 check += (signed char)bytes[i]; 928 for (; i < 156; i++) 929 check += 32; 930 for (; i < 512; i++) 931 check += (signed char)bytes[i]; 932 if (sum == check) 933 return (1); 934 935 return (0); 936} 937 938/* 939 * Return true if this block contains only nulls. 940 */ 941static int 942archive_block_is_null(const char *p) 943{ 944 unsigned i; 945 946 for (i = 0; i < 512; i++) 947 if (*p++) 948 return (0); 949 return (1); 950} 951 952/* 953 * Interpret 'A' Solaris ACL header 954 */ 955static int 956header_Solaris_ACL(struct archive_read *a, struct tar *tar, 957 struct archive_entry *entry, const void *h, size_t *unconsumed) 958{ 959 const struct archive_entry_header_ustar *header; 960 size_t size; 961 int err, acl_type; 962 int64_t type; 963 char *acl, *p; 964 965 /* 966 * read_body_to_string adds a NUL terminator, but we need a little 967 * more to make sure that we don't overrun acl_text later. 968 */ 969 header = (const struct archive_entry_header_ustar *)h; 970 size = (size_t)tar_atol(header->size, sizeof(header->size)); 971 err = read_body_to_string(a, tar, &(tar->acl_text), h, unconsumed); 972 if (err != ARCHIVE_OK) 973 return (err); 974 975 /* Recursively read next header */ 976 err = tar_read_header(a, tar, entry, unconsumed); 977 if ((err != ARCHIVE_OK) && (err != ARCHIVE_WARN)) 978 return (err); 979 980 /* TODO: Examine the first characters to see if this 981 * is an AIX ACL descriptor. We'll likely never support 982 * them, but it would be polite to recognize and warn when 983 * we do see them. */ 984 985 /* Leading octal number indicates ACL type and number of entries. */ 986 p = acl = tar->acl_text.s; 987 type = 0; 988 while (*p != '\0' && p < acl + size) { 989 if (*p < '0' || *p > '7') { 990 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 991 "Malformed Solaris ACL attribute (invalid digit)"); 992 return(ARCHIVE_WARN); 993 } 994 type <<= 3; 995 type += *p - '0'; 996 if (type > 077777777) { 997 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 998 "Malformed Solaris ACL attribute (count too large)"); 999 return (ARCHIVE_WARN); 1000 } 1001 p++; 1002 } 1003 switch ((int)type & ~0777777) { 1004 case 01000000: 1005 /* POSIX.1e ACL */ 1006 acl_type = ARCHIVE_ENTRY_ACL_TYPE_ACCESS; 1007 break; 1008 case 03000000: 1009 /* NFSv4 ACL */ 1010 acl_type = ARCHIVE_ENTRY_ACL_TYPE_NFS4; 1011 break; 1012 default: 1013 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 1014 "Malformed Solaris ACL attribute (unsupported type %o)", 1015 (int)type); 1016 return (ARCHIVE_WARN); 1017 } 1018 p++; 1019 1020 if (p >= acl + size) { 1021 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 1022 "Malformed Solaris ACL attribute (body overflow)"); 1023 return(ARCHIVE_WARN); 1024 } 1025 1026 /* ACL text is null-terminated; find the end. */ 1027 size -= (p - acl); 1028 acl = p; 1029 1030 while (*p != '\0' && p < acl + size) 1031 p++; 1032 1033 if (tar->sconv_acl == NULL) { 1034 tar->sconv_acl = archive_string_conversion_from_charset( 1035 &(a->archive), "UTF-8", 1); 1036 if (tar->sconv_acl == NULL) 1037 return (ARCHIVE_FATAL); 1038 } 1039 archive_strncpy(&(tar->localname), acl, p - acl); 1040 err = archive_acl_from_text_l(archive_entry_acl(entry), 1041 tar->localname.s, acl_type, tar->sconv_acl); 1042 if (err != ARCHIVE_OK) { 1043 if (errno == ENOMEM) { 1044 archive_set_error(&a->archive, ENOMEM, 1045 "Can't allocate memory for ACL"); 1046 } else 1047 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 1048 "Malformed Solaris ACL attribute (unparsable)"); 1049 } 1050 return (err); 1051} 1052 1053/* 1054 * Interpret 'K' long linkname header. 1055 */ 1056static int 1057header_longlink(struct archive_read *a, struct tar *tar, 1058 struct archive_entry *entry, const void *h, size_t *unconsumed) 1059{ 1060 int err; 1061 1062 err = read_body_to_string(a, tar, &(tar->longlink), h, unconsumed); 1063 if (err != ARCHIVE_OK) 1064 return (err); 1065 err = tar_read_header(a, tar, entry, unconsumed); 1066 if ((err != ARCHIVE_OK) && (err != ARCHIVE_WARN)) 1067 return (err); 1068 /* Set symlink if symlink already set, else hardlink. */ 1069 archive_entry_copy_link(entry, tar->longlink.s); 1070 return (ARCHIVE_OK); 1071} 1072 1073static int 1074set_conversion_failed_error(struct archive_read *a, 1075 struct archive_string_conv *sconv, const char *name) 1076{ 1077 if (errno == ENOMEM) { 1078 archive_set_error(&a->archive, ENOMEM, 1079 "Can't allocate memory for %s", name); 1080 return (ARCHIVE_FATAL); 1081 } 1082 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 1083 "%s can't be converted from %s to current locale.", 1084 name, archive_string_conversion_charset_name(sconv)); 1085 return (ARCHIVE_WARN); 1086} 1087 1088/* 1089 * Interpret 'L' long filename header. 1090 */ 1091static int 1092header_longname(struct archive_read *a, struct tar *tar, 1093 struct archive_entry *entry, const void *h, size_t *unconsumed) 1094{ 1095 int err; 1096 1097 err = read_body_to_string(a, tar, &(tar->longname), h, unconsumed); 1098 if (err != ARCHIVE_OK) 1099 return (err); 1100 /* Read and parse "real" header, then override name. */ 1101 err = tar_read_header(a, tar, entry, unconsumed); 1102 if ((err != ARCHIVE_OK) && (err != ARCHIVE_WARN)) 1103 return (err); 1104 if (archive_entry_copy_pathname_l(entry, tar->longname.s, 1105 archive_strlen(&(tar->longname)), tar->sconv) != 0) 1106 err = set_conversion_failed_error(a, tar->sconv, "Pathname"); 1107 return (err); 1108} 1109 1110 1111/* 1112 * Interpret 'V' GNU tar volume header. 1113 */ 1114static int 1115header_volume(struct archive_read *a, struct tar *tar, 1116 struct archive_entry *entry, const void *h, size_t *unconsumed) 1117{ 1118 (void)h; 1119 1120 /* Just skip this and read the next header. */ 1121 return (tar_read_header(a, tar, entry, unconsumed)); 1122} 1123 1124/* 1125 * Read body of an archive entry into an archive_string object. 1126 */ 1127static int 1128read_body_to_string(struct archive_read *a, struct tar *tar, 1129 struct archive_string *as, const void *h, size_t *unconsumed) 1130{ 1131 int64_t size; 1132 const struct archive_entry_header_ustar *header; 1133 const void *src; 1134 1135 (void)tar; /* UNUSED */ 1136 header = (const struct archive_entry_header_ustar *)h; 1137 size = tar_atol(header->size, sizeof(header->size)); 1138 if ((size > 1048576) || (size < 0)) { 1139 archive_set_error(&a->archive, EINVAL, 1140 "Special header too large"); 1141 return (ARCHIVE_FATAL); 1142 } 1143 1144 /* Fail if we can't make our buffer big enough. */ 1145 if (archive_string_ensure(as, (size_t)size+1) == NULL) { 1146 archive_set_error(&a->archive, ENOMEM, 1147 "No memory"); 1148 return (ARCHIVE_FATAL); 1149 } 1150 1151 tar_flush_unconsumed(a, unconsumed); 1152 1153 /* Read the body into the string. */ 1154 *unconsumed = (size_t)((size + 511) & ~ 511); 1155 src = __archive_read_ahead(a, *unconsumed, NULL); 1156 if (src == NULL) { 1157 *unconsumed = 0; 1158 return (ARCHIVE_FATAL); 1159 } 1160 memcpy(as->s, src, (size_t)size); 1161 as->s[size] = '\0'; 1162 as->length = (size_t)size; 1163 return (ARCHIVE_OK); 1164} 1165 1166/* 1167 * Parse out common header elements. 1168 * 1169 * This would be the same as header_old_tar, except that the 1170 * filename is handled slightly differently for old and POSIX 1171 * entries (POSIX entries support a 'prefix'). This factoring 1172 * allows header_old_tar and header_ustar 1173 * to handle filenames differently, while still putting most of the 1174 * common parsing into one place. 1175 */ 1176static int 1177header_common(struct archive_read *a, struct tar *tar, 1178 struct archive_entry *entry, const void *h) 1179{ 1180 const struct archive_entry_header_ustar *header; 1181 char tartype; 1182 int err = ARCHIVE_OK; 1183 1184 header = (const struct archive_entry_header_ustar *)h; 1185 if (header->linkname[0]) 1186 archive_strncpy(&(tar->entry_linkpath), 1187 header->linkname, sizeof(header->linkname)); 1188 else 1189 archive_string_empty(&(tar->entry_linkpath)); 1190 1191 /* Parse out the numeric fields (all are octal) */ 1192 archive_entry_set_mode(entry, 1193 (mode_t)tar_atol(header->mode, sizeof(header->mode))); 1194 archive_entry_set_uid(entry, tar_atol(header->uid, sizeof(header->uid))); 1195 archive_entry_set_gid(entry, tar_atol(header->gid, sizeof(header->gid))); 1196 tar->entry_bytes_remaining = tar_atol(header->size, sizeof(header->size)); 1197 if (tar->entry_bytes_remaining < 0) { 1198 tar->entry_bytes_remaining = 0; 1199 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 1200 "Tar entry has negative size"); 1201 return (ARCHIVE_FATAL); 1202 } 1203 if (tar->entry_bytes_remaining == INT64_MAX) { 1204 /* Note: tar_atol returns INT64_MAX on overflow */ 1205 tar->entry_bytes_remaining = 0; 1206 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 1207 "Tar entry size overflow"); 1208 return (ARCHIVE_FATAL); 1209 } 1210 tar->realsize = tar->entry_bytes_remaining; 1211 archive_entry_set_size(entry, tar->entry_bytes_remaining); 1212 archive_entry_set_mtime(entry, tar_atol(header->mtime, sizeof(header->mtime)), 0); 1213 1214 /* Handle the tar type flag appropriately. */ 1215 tartype = header->typeflag[0]; 1216 1217 switch (tartype) { 1218 case '1': /* Hard link */ 1219 if (archive_entry_copy_hardlink_l(entry, tar->entry_linkpath.s, 1220 archive_strlen(&(tar->entry_linkpath)), tar->sconv) != 0) { 1221 err = set_conversion_failed_error(a, tar->sconv, 1222 "Linkname"); 1223 if (err == ARCHIVE_FATAL) 1224 return (err); 1225 } 1226 /* 1227 * The following may seem odd, but: Technically, tar 1228 * does not store the file type for a "hard link" 1229 * entry, only the fact that it is a hard link. So, I 1230 * leave the type zero normally. But, pax interchange 1231 * format allows hard links to have data, which 1232 * implies that the underlying entry is a regular 1233 * file. 1234 */ 1235 if (archive_entry_size(entry) > 0) 1236 archive_entry_set_filetype(entry, AE_IFREG); 1237 1238 /* 1239 * A tricky point: Traditionally, tar readers have 1240 * ignored the size field when reading hardlink 1241 * entries, and some writers put non-zero sizes even 1242 * though the body is empty. POSIX blessed this 1243 * convention in the 1988 standard, but broke with 1244 * this tradition in 2001 by permitting hardlink 1245 * entries to store valid bodies in pax interchange 1246 * format, but not in ustar format. Since there is no 1247 * hard and fast way to distinguish pax interchange 1248 * from earlier archives (the 'x' and 'g' entries are 1249 * optional, after all), we need a heuristic. 1250 */ 1251 if (archive_entry_size(entry) == 0) { 1252 /* If the size is already zero, we're done. */ 1253 } else if (a->archive.archive_format 1254 == ARCHIVE_FORMAT_TAR_PAX_INTERCHANGE) { 1255 /* Definitely pax extended; must obey hardlink size. */ 1256 } else if (a->archive.archive_format == ARCHIVE_FORMAT_TAR 1257 || a->archive.archive_format == ARCHIVE_FORMAT_TAR_GNUTAR) 1258 { 1259 /* Old-style or GNU tar: we must ignore the size. */ 1260 archive_entry_set_size(entry, 0); 1261 tar->entry_bytes_remaining = 0; 1262 } else if (archive_read_format_tar_bid(a, 50) > 50) { 1263 /* 1264 * We don't know if it's pax: If the bid 1265 * function sees a valid ustar header 1266 * immediately following, then let's ignore 1267 * the hardlink size. 1268 */ 1269 archive_entry_set_size(entry, 0); 1270 tar->entry_bytes_remaining = 0; 1271 } 1272 /* 1273 * TODO: There are still two cases I'd like to handle: 1274 * = a ustar non-pax archive with a hardlink entry at 1275 * end-of-archive. (Look for block of nulls following?) 1276 * = a pax archive that has not seen any pax headers 1277 * and has an entry which is a hardlink entry storing 1278 * a body containing an uncompressed tar archive. 1279 * The first is worth addressing; I don't see any reliable 1280 * way to deal with the second possibility. 1281 */ 1282 break; 1283 case '2': /* Symlink */ 1284 archive_entry_set_filetype(entry, AE_IFLNK); 1285 archive_entry_set_size(entry, 0); 1286 tar->entry_bytes_remaining = 0; 1287 if (archive_entry_copy_symlink_l(entry, tar->entry_linkpath.s, 1288 archive_strlen(&(tar->entry_linkpath)), tar->sconv) != 0) { 1289 err = set_conversion_failed_error(a, tar->sconv, 1290 "Linkname"); 1291 if (err == ARCHIVE_FATAL) 1292 return (err); 1293 } 1294 break; 1295 case '3': /* Character device */ 1296 archive_entry_set_filetype(entry, AE_IFCHR); 1297 archive_entry_set_size(entry, 0); 1298 tar->entry_bytes_remaining = 0; 1299 break; 1300 case '4': /* Block device */ 1301 archive_entry_set_filetype(entry, AE_IFBLK); 1302 archive_entry_set_size(entry, 0); 1303 tar->entry_bytes_remaining = 0; 1304 break; 1305 case '5': /* Dir */ 1306 archive_entry_set_filetype(entry, AE_IFDIR); 1307 archive_entry_set_size(entry, 0); 1308 tar->entry_bytes_remaining = 0; 1309 break; 1310 case '6': /* FIFO device */ 1311 archive_entry_set_filetype(entry, AE_IFIFO); 1312 archive_entry_set_size(entry, 0); 1313 tar->entry_bytes_remaining = 0; 1314 break; 1315 case 'D': /* GNU incremental directory type */ 1316 /* 1317 * No special handling is actually required here. 1318 * It might be nice someday to preprocess the file list and 1319 * provide it to the client, though. 1320 */ 1321 archive_entry_set_filetype(entry, AE_IFDIR); 1322 break; 1323 case 'M': /* GNU "Multi-volume" (remainder of file from last archive)*/ 1324 /* 1325 * As far as I can tell, this is just like a regular file 1326 * entry, except that the contents should be _appended_ to 1327 * the indicated file at the indicated offset. This may 1328 * require some API work to fully support. 1329 */ 1330 break; 1331 case 'N': /* Old GNU "long filename" entry. */ 1332 /* The body of this entry is a script for renaming 1333 * previously-extracted entries. Ugh. It will never 1334 * be supported by libarchive. */ 1335 archive_entry_set_filetype(entry, AE_IFREG); 1336 break; 1337 case 'S': /* GNU sparse files */ 1338 /* 1339 * Sparse files are really just regular files with 1340 * sparse information in the extended area. 1341 */ 1342 /* FALLTHROUGH */ 1343 case '0': 1344 /* 1345 * Enable sparse file "read" support only for regular 1346 * files and explicit GNU sparse files. However, we 1347 * don't allow non-standard file types to be sparse. 1348 */ 1349 tar->sparse_allowed = 1; 1350 /* FALLTHROUGH */ 1351 default: /* Regular file and non-standard types */ 1352 /* 1353 * Per POSIX: non-recognized types should always be 1354 * treated as regular files. 1355 */ 1356 archive_entry_set_filetype(entry, AE_IFREG); 1357 break; 1358 } 1359 return (err); 1360} 1361 1362/* 1363 * Parse out header elements for "old-style" tar archives. 1364 */ 1365static int 1366header_old_tar(struct archive_read *a, struct tar *tar, 1367 struct archive_entry *entry, const void *h) 1368{ 1369 const struct archive_entry_header_ustar *header; 1370 int err = ARCHIVE_OK, err2; 1371 1372 /* Copy filename over (to ensure null termination). */ 1373 header = (const struct archive_entry_header_ustar *)h; 1374 if (archive_entry_copy_pathname_l(entry, 1375 header->name, sizeof(header->name), tar->sconv) != 0) { 1376 err = set_conversion_failed_error(a, tar->sconv, "Pathname"); 1377 if (err == ARCHIVE_FATAL) 1378 return (err); 1379 } 1380 1381 /* Grab rest of common fields */ 1382 err2 = header_common(a, tar, entry, h); 1383 if (err > err2) 1384 err = err2; 1385 1386 tar->entry_padding = 0x1ff & (-tar->entry_bytes_remaining); 1387 return (err); 1388} 1389 1390/* 1391 * Read a Mac AppleDouble-encoded blob of file metadata, 1392 * if there is one. 1393 */ 1394static int 1395read_mac_metadata_blob(struct archive_read *a, struct tar *tar, 1396 struct archive_entry *entry, const void *h, size_t *unconsumed) 1397{ 1398 int64_t size; 1399 const void *data; 1400 const char *p, *name; 1401 const wchar_t *wp, *wname; 1402 1403 (void)h; /* UNUSED */ 1404 1405 wname = wp = archive_entry_pathname_w(entry); 1406 if (wp != NULL) { 1407 /* Find the last path element. */ 1408 for (; *wp != L'\0'; ++wp) { 1409 if (wp[0] == '/' && wp[1] != L'\0') 1410 wname = wp + 1; 1411 } 1412 /* 1413 * If last path element starts with "._", then 1414 * this is a Mac extension. 1415 */ 1416 if (wname[0] != L'.' || wname[1] != L'_' || wname[2] == L'\0') 1417 return ARCHIVE_OK; 1418 } else { 1419 /* Find the last path element. */ 1420 name = p = archive_entry_pathname(entry); 1421 if (p == NULL) 1422 return (ARCHIVE_FAILED); 1423 for (; *p != '\0'; ++p) { 1424 if (p[0] == '/' && p[1] != '\0') 1425 name = p + 1; 1426 } 1427 /* 1428 * If last path element starts with "._", then 1429 * this is a Mac extension. 1430 */ 1431 if (name[0] != '.' || name[1] != '_' || name[2] == '\0') 1432 return ARCHIVE_OK; 1433 } 1434 1435 /* Read the body as a Mac OS metadata blob. */ 1436 size = archive_entry_size(entry); 1437 1438 /* 1439 * TODO: Look beyond the body here to peek at the next header. 1440 * If it's a regular header (not an extension header) 1441 * that has the wrong name, just return the current 1442 * entry as-is, without consuming the body here. 1443 * That would reduce the risk of us mis-identifying 1444 * an ordinary file that just happened to have 1445 * a name starting with "._". 1446 * 1447 * Q: Is the above idea really possible? Even 1448 * when there are GNU or pax extension entries? 1449 */ 1450 data = __archive_read_ahead(a, (size_t)size, NULL); 1451 if (data == NULL) { 1452 *unconsumed = 0; 1453 return (ARCHIVE_FATAL); 1454 } 1455 archive_entry_copy_mac_metadata(entry, data, (size_t)size); 1456 *unconsumed = (size_t)((size + 511) & ~ 511); 1457 tar_flush_unconsumed(a, unconsumed); 1458 return (tar_read_header(a, tar, entry, unconsumed)); 1459} 1460 1461/* 1462 * Parse a file header for a pax extended archive entry. 1463 */ 1464static int 1465header_pax_global(struct archive_read *a, struct tar *tar, 1466 struct archive_entry *entry, const void *h, size_t *unconsumed) 1467{ 1468 int err; 1469 1470 err = read_body_to_string(a, tar, &(tar->pax_global), h, unconsumed); 1471 if (err != ARCHIVE_OK) 1472 return (err); 1473 err = tar_read_header(a, tar, entry, unconsumed); 1474 return (err); 1475} 1476 1477static int 1478header_pax_extensions(struct archive_read *a, struct tar *tar, 1479 struct archive_entry *entry, const void *h, size_t *unconsumed) 1480{ 1481 int err, err2; 1482 1483 err = read_body_to_string(a, tar, &(tar->pax_header), h, unconsumed); 1484 if (err != ARCHIVE_OK) 1485 return (err); 1486 1487 /* Parse the next header. */ 1488 err = tar_read_header(a, tar, entry, unconsumed); 1489 if ((err != ARCHIVE_OK) && (err != ARCHIVE_WARN)) 1490 return (err); 1491 1492 /* 1493 * TODO: Parse global/default options into 'entry' struct here 1494 * before handling file-specific options. 1495 * 1496 * This design (parse standard header, then overwrite with pax 1497 * extended attribute data) usually works well, but isn't ideal; 1498 * it would be better to parse the pax extended attributes first 1499 * and then skip any fields in the standard header that were 1500 * defined in the pax header. 1501 */ 1502 err2 = pax_header(a, tar, entry, &tar->pax_header); 1503 err = err_combine(err, err2); 1504 tar->entry_padding = 0x1ff & (-tar->entry_bytes_remaining); 1505 return (err); 1506} 1507 1508 1509/* 1510 * Parse a file header for a Posix "ustar" archive entry. This also 1511 * handles "pax" or "extended ustar" entries. 1512 */ 1513static int 1514header_ustar(struct archive_read *a, struct tar *tar, 1515 struct archive_entry *entry, const void *h) 1516{ 1517 const struct archive_entry_header_ustar *header; 1518 struct archive_string *as; 1519 int err = ARCHIVE_OK, r; 1520 1521 header = (const struct archive_entry_header_ustar *)h; 1522 1523 /* Copy name into an internal buffer to ensure null-termination. */ 1524 as = &(tar->entry_pathname); 1525 if (header->prefix[0]) { 1526 archive_strncpy(as, header->prefix, sizeof(header->prefix)); 1527 if (as->s[archive_strlen(as) - 1] != '/') 1528 archive_strappend_char(as, '/'); 1529 archive_strncat(as, header->name, sizeof(header->name)); 1530 } else { 1531 archive_strncpy(as, header->name, sizeof(header->name)); 1532 } 1533 if (archive_entry_copy_pathname_l(entry, as->s, archive_strlen(as), 1534 tar->sconv) != 0) { 1535 err = set_conversion_failed_error(a, tar->sconv, "Pathname"); 1536 if (err == ARCHIVE_FATAL) 1537 return (err); 1538 } 1539 1540 /* Handle rest of common fields. */ 1541 r = header_common(a, tar, entry, h); 1542 if (r == ARCHIVE_FATAL) 1543 return (r); 1544 if (r < err) 1545 err = r; 1546 1547 /* Handle POSIX ustar fields. */ 1548 if (archive_entry_copy_uname_l(entry, 1549 header->uname, sizeof(header->uname), tar->sconv) != 0) { 1550 err = set_conversion_failed_error(a, tar->sconv, "Uname"); 1551 if (err == ARCHIVE_FATAL) 1552 return (err); 1553 } 1554 1555 if (archive_entry_copy_gname_l(entry, 1556 header->gname, sizeof(header->gname), tar->sconv) != 0) { 1557 err = set_conversion_failed_error(a, tar->sconv, "Gname"); 1558 if (err == ARCHIVE_FATAL) 1559 return (err); 1560 } 1561 1562 /* Parse out device numbers only for char and block specials. */ 1563 if (header->typeflag[0] == '3' || header->typeflag[0] == '4') { 1564 archive_entry_set_rdevmajor(entry, (dev_t) 1565 tar_atol(header->rdevmajor, sizeof(header->rdevmajor))); 1566 archive_entry_set_rdevminor(entry, (dev_t) 1567 tar_atol(header->rdevminor, sizeof(header->rdevminor))); 1568 } 1569 1570 tar->entry_padding = 0x1ff & (-tar->entry_bytes_remaining); 1571 1572 return (err); 1573} 1574 1575 1576/* 1577 * Parse the pax extended attributes record. 1578 * 1579 * Returns non-zero if there's an error in the data. 1580 */ 1581static int 1582pax_header(struct archive_read *a, struct tar *tar, 1583 struct archive_entry *entry, struct archive_string *in_as) 1584{ 1585 size_t attr_length, l, line_length, value_length; 1586 char *p; 1587 char *key, *value; 1588 struct archive_string *as; 1589 struct archive_string_conv *sconv; 1590 int err, err2; 1591 char *attr = in_as->s; 1592 1593 attr_length = in_as->length; 1594 tar->pax_hdrcharset_binary = 0; 1595 archive_string_empty(&(tar->entry_gname)); 1596 archive_string_empty(&(tar->entry_linkpath)); 1597 archive_string_empty(&(tar->entry_pathname)); 1598 archive_string_empty(&(tar->entry_pathname_override)); 1599 archive_string_empty(&(tar->entry_uname)); 1600 err = ARCHIVE_OK; 1601 while (attr_length > 0) { 1602 /* Parse decimal length field at start of line. */ 1603 line_length = 0; 1604 l = attr_length; 1605 p = attr; /* Record start of line. */ 1606 while (l>0) { 1607 if (*p == ' ') { 1608 p++; 1609 l--; 1610 break; 1611 } 1612 if (*p < '0' || *p > '9') { 1613 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 1614 "Ignoring malformed pax extended attributes"); 1615 return (ARCHIVE_WARN); 1616 } 1617 line_length *= 10; 1618 line_length += *p - '0'; 1619 if (line_length > 999999) { 1620 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 1621 "Rejecting pax extended attribute > 1MB"); 1622 return (ARCHIVE_WARN); 1623 } 1624 p++; 1625 l--; 1626 } 1627 1628 /* 1629 * Parsed length must be no bigger than available data, 1630 * at least 1, and the last character of the line must 1631 * be '\n'. 1632 */ 1633 if (line_length > attr_length 1634 || line_length < 1 1635 || attr[line_length - 1] != '\n') 1636 { 1637 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 1638 "Ignoring malformed pax extended attribute"); 1639 return (ARCHIVE_WARN); 1640 } 1641 1642 /* Null-terminate the line. */ 1643 attr[line_length - 1] = '\0'; 1644 1645 /* Find end of key and null terminate it. */ 1646 key = p; 1647 if (key[0] == '=') 1648 return (-1); 1649 while (*p && *p != '=') 1650 ++p; 1651 if (*p == '\0') { 1652 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 1653 "Invalid pax extended attributes"); 1654 return (ARCHIVE_WARN); 1655 } 1656 *p = '\0'; 1657 1658 value = p + 1; 1659 1660 /* Some values may be binary data */ 1661 value_length = attr + line_length - 1 - value; 1662 1663 /* Identify this attribute and set it in the entry. */ 1664 err2 = pax_attribute(a, tar, entry, key, value, value_length); 1665 if (err2 == ARCHIVE_FATAL) 1666 return (err2); 1667 err = err_combine(err, err2); 1668 1669 /* Skip to next line */ 1670 attr += line_length; 1671 attr_length -= line_length; 1672 } 1673 1674 /* 1675 * PAX format uses UTF-8 as default charset for its metadata 1676 * unless hdrcharset=BINARY is present in its header. 1677 * We apply the charset specified by the hdrcharset option only 1678 * when the hdrcharset attribute(in PAX header) is BINARY because 1679 * we respect the charset described in PAX header and BINARY also 1680 * means that metadata(filename,uname and gname) character-set 1681 * is unknown. 1682 */ 1683 if (tar->pax_hdrcharset_binary) 1684 sconv = tar->opt_sconv; 1685 else { 1686 sconv = archive_string_conversion_from_charset( 1687 &(a->archive), "UTF-8", 1); 1688 if (sconv == NULL) 1689 return (ARCHIVE_FATAL); 1690 if (tar->compat_2x) 1691 archive_string_conversion_set_opt(sconv, 1692 SCONV_SET_OPT_UTF8_LIBARCHIVE2X); 1693 } 1694 1695 if (archive_strlen(&(tar->entry_gname)) > 0) { 1696 if (archive_entry_copy_gname_l(entry, tar->entry_gname.s, 1697 archive_strlen(&(tar->entry_gname)), sconv) != 0) { 1698 err = set_conversion_failed_error(a, sconv, "Gname"); 1699 if (err == ARCHIVE_FATAL) 1700 return (err); 1701 /* Use a converted an original name. */ 1702 archive_entry_copy_gname(entry, tar->entry_gname.s); 1703 } 1704 } 1705 if (archive_strlen(&(tar->entry_linkpath)) > 0) { 1706 if (archive_entry_copy_link_l(entry, tar->entry_linkpath.s, 1707 archive_strlen(&(tar->entry_linkpath)), sconv) != 0) { 1708 err = set_conversion_failed_error(a, sconv, "Linkname"); 1709 if (err == ARCHIVE_FATAL) 1710 return (err); 1711 /* Use a converted an original name. */ 1712 archive_entry_copy_link(entry, tar->entry_linkpath.s); 1713 } 1714 } 1715 /* 1716 * Some extensions (such as the GNU sparse file extensions) 1717 * deliberately store a synthetic name under the regular 'path' 1718 * attribute and the real file name under a different attribute. 1719 * Since we're supposed to not care about the order, we 1720 * have no choice but to store all of the various filenames 1721 * we find and figure it all out afterwards. This is the 1722 * figuring out part. 1723 */ 1724 as = NULL; 1725 if (archive_strlen(&(tar->entry_pathname_override)) > 0) 1726 as = &(tar->entry_pathname_override); 1727 else if (archive_strlen(&(tar->entry_pathname)) > 0) 1728 as = &(tar->entry_pathname); 1729 if (as != NULL) { 1730 if (archive_entry_copy_pathname_l(entry, as->s, 1731 archive_strlen(as), sconv) != 0) { 1732 err = set_conversion_failed_error(a, sconv, "Pathname"); 1733 if (err == ARCHIVE_FATAL) 1734 return (err); 1735 /* Use a converted an original name. */ 1736 archive_entry_copy_pathname(entry, as->s); 1737 } 1738 } 1739 if (archive_strlen(&(tar->entry_uname)) > 0) { 1740 if (archive_entry_copy_uname_l(entry, tar->entry_uname.s, 1741 archive_strlen(&(tar->entry_uname)), sconv) != 0) { 1742 err = set_conversion_failed_error(a, sconv, "Uname"); 1743 if (err == ARCHIVE_FATAL) 1744 return (err); 1745 /* Use a converted an original name. */ 1746 archive_entry_copy_uname(entry, tar->entry_uname.s); 1747 } 1748 } 1749 return (err); 1750} 1751 1752static int 1753pax_attribute_xattr(struct archive_entry *entry, 1754 const char *name, const char *value) 1755{ 1756 char *name_decoded; 1757 void *value_decoded; 1758 size_t value_len; 1759 1760 if (strlen(name) < 18 || (memcmp(name, "LIBARCHIVE.xattr.", 17)) != 0) 1761 return 3; 1762 1763 name += 17; 1764 1765 /* URL-decode name */ 1766 name_decoded = url_decode(name); 1767 if (name_decoded == NULL) 1768 return 2; 1769 1770 /* Base-64 decode value */ 1771 value_decoded = base64_decode(value, strlen(value), &value_len); 1772 if (value_decoded == NULL) { 1773 free(name_decoded); 1774 return 1; 1775 } 1776 1777 archive_entry_xattr_add_entry(entry, name_decoded, 1778 value_decoded, value_len); 1779 1780 free(name_decoded); 1781 free(value_decoded); 1782 return 0; 1783} 1784 1785static int 1786pax_attribute_schily_xattr(struct archive_entry *entry, 1787 const char *name, const char *value, size_t value_length) 1788{ 1789 if (strlen(name) < 14 || (memcmp(name, "SCHILY.xattr.", 13)) != 0) 1790 return 1; 1791 1792 name += 13; 1793 1794 archive_entry_xattr_add_entry(entry, name, value, value_length); 1795 1796 return 0; 1797} 1798 1799static int 1800pax_attribute_acl(struct archive_read *a, struct tar *tar, 1801 struct archive_entry *entry, const char *value, int type) 1802{ 1803 int r; 1804 const char* errstr; 1805 1806 switch (type) { 1807 case ARCHIVE_ENTRY_ACL_TYPE_ACCESS: 1808 errstr = "SCHILY.acl.access"; 1809 break; 1810 case ARCHIVE_ENTRY_ACL_TYPE_DEFAULT: 1811 errstr = "SCHILY.acl.default"; 1812 break; 1813 case ARCHIVE_ENTRY_ACL_TYPE_NFS4: 1814 errstr = "SCHILY.acl.ace"; 1815 break; 1816 default: 1817 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 1818 "Unknown ACL type: %d", type); 1819 return(ARCHIVE_FATAL); 1820 } 1821 1822 if (tar->sconv_acl == NULL) { 1823 tar->sconv_acl = 1824 archive_string_conversion_from_charset( 1825 &(a->archive), "UTF-8", 1); 1826 if (tar->sconv_acl == NULL) 1827 return (ARCHIVE_FATAL); 1828 } 1829 1830 r = archive_acl_from_text_l(archive_entry_acl(entry), value, type, 1831 tar->sconv_acl); 1832 if (r != ARCHIVE_OK) { 1833 if (r == ARCHIVE_FATAL) { 1834 archive_set_error(&a->archive, ENOMEM, 1835 "%s %s", "Can't allocate memory for ", 1836 errstr); 1837 return (r); 1838 } 1839 archive_set_error(&a->archive, 1840 ARCHIVE_ERRNO_MISC, "%s %s", "Parse error: ", errstr); 1841 } 1842 return (r); 1843} 1844 1845/* 1846 * Parse a single key=value attribute. key/value pointers are 1847 * assumed to point into reasonably long-lived storage. 1848 * 1849 * Note that POSIX reserves all-lowercase keywords. Vendor-specific 1850 * extensions should always have keywords of the form "VENDOR.attribute" 1851 * In particular, it's quite feasible to support many different 1852 * vendor extensions here. I'm using "LIBARCHIVE" for extensions 1853 * unique to this library. 1854 * 1855 * Investigate other vendor-specific extensions and see if 1856 * any of them look useful. 1857 */ 1858static int 1859pax_attribute(struct archive_read *a, struct tar *tar, 1860 struct archive_entry *entry, const char *key, const char *value, size_t value_length) 1861{ 1862 int64_t s; 1863 long n; 1864 int err = ARCHIVE_OK, r; 1865 1866#ifndef __FreeBSD__ 1867 if (value == NULL) 1868 value = ""; /* Disable compiler warning; do not pass 1869 * NULL pointer to strlen(). */ 1870#endif 1871 switch (key[0]) { 1872 case 'G': 1873 /* Reject GNU.sparse.* headers on non-regular files. */ 1874 if (strncmp(key, "GNU.sparse", 10) == 0 && 1875 !tar->sparse_allowed) { 1876 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 1877 "Non-regular file cannot be sparse"); 1878 return (ARCHIVE_FATAL); 1879 } 1880 1881 /* GNU "0.0" sparse pax format. */ 1882 if (strcmp(key, "GNU.sparse.numblocks") == 0) { 1883 tar->sparse_offset = -1; 1884 tar->sparse_numbytes = -1; 1885 tar->sparse_gnu_major = 0; 1886 tar->sparse_gnu_minor = 0; 1887 } 1888 if (strcmp(key, "GNU.sparse.offset") == 0) { 1889 tar->sparse_offset = tar_atol10(value, strlen(value)); 1890 if (tar->sparse_numbytes != -1) { 1891 if (gnu_add_sparse_entry(a, tar, 1892 tar->sparse_offset, tar->sparse_numbytes) 1893 != ARCHIVE_OK) 1894 return (ARCHIVE_FATAL); 1895 tar->sparse_offset = -1; 1896 tar->sparse_numbytes = -1; 1897 } 1898 } 1899 if (strcmp(key, "GNU.sparse.numbytes") == 0) { 1900 tar->sparse_numbytes = tar_atol10(value, strlen(value)); 1901 if (tar->sparse_numbytes != -1) { 1902 if (gnu_add_sparse_entry(a, tar, 1903 tar->sparse_offset, tar->sparse_numbytes) 1904 != ARCHIVE_OK) 1905 return (ARCHIVE_FATAL); 1906 tar->sparse_offset = -1; 1907 tar->sparse_numbytes = -1; 1908 } 1909 } 1910 if (strcmp(key, "GNU.sparse.size") == 0) { 1911 tar->realsize = tar_atol10(value, strlen(value)); 1912 archive_entry_set_size(entry, tar->realsize); 1913 tar->realsize_override = 1; 1914 } 1915 1916 /* GNU "0.1" sparse pax format. */ 1917 if (strcmp(key, "GNU.sparse.map") == 0) { 1918 tar->sparse_gnu_major = 0; 1919 tar->sparse_gnu_minor = 1; 1920 if (gnu_sparse_01_parse(a, tar, value) != ARCHIVE_OK) 1921 return (ARCHIVE_WARN); 1922 } 1923 1924 /* GNU "1.0" sparse pax format */ 1925 if (strcmp(key, "GNU.sparse.major") == 0) { 1926 tar->sparse_gnu_major = (int)tar_atol10(value, strlen(value)); 1927 tar->sparse_gnu_pending = 1; 1928 } 1929 if (strcmp(key, "GNU.sparse.minor") == 0) { 1930 tar->sparse_gnu_minor = (int)tar_atol10(value, strlen(value)); 1931 tar->sparse_gnu_pending = 1; 1932 } 1933 if (strcmp(key, "GNU.sparse.name") == 0) { 1934 /* 1935 * The real filename; when storing sparse 1936 * files, GNU tar puts a synthesized name into 1937 * the regular 'path' attribute in an attempt 1938 * to limit confusion. ;-) 1939 */ 1940 archive_strcpy(&(tar->entry_pathname_override), value); 1941 } 1942 if (strcmp(key, "GNU.sparse.realsize") == 0) { 1943 tar->realsize = tar_atol10(value, strlen(value)); 1944 archive_entry_set_size(entry, tar->realsize); 1945 tar->realsize_override = 1; 1946 } 1947 break; 1948 case 'L': 1949 /* Our extensions */ 1950/* TODO: Handle arbitrary extended attributes... */ 1951/* 1952 if (strcmp(key, "LIBARCHIVE.xxxxxxx") == 0) 1953 archive_entry_set_xxxxxx(entry, value); 1954*/ 1955 if (strcmp(key, "LIBARCHIVE.creationtime") == 0) { 1956 pax_time(value, &s, &n); 1957 archive_entry_set_birthtime(entry, s, n); 1958 } 1959 if (strcmp(key, "LIBARCHIVE.symlinktype") == 0) { 1960 if (strcmp(value, "file") == 0) { 1961 archive_entry_set_symlink_type(entry, 1962 AE_SYMLINK_TYPE_FILE); 1963 } else if (strcmp(value, "dir") == 0) { 1964 archive_entry_set_symlink_type(entry, 1965 AE_SYMLINK_TYPE_DIRECTORY); 1966 } 1967 } 1968 if (memcmp(key, "LIBARCHIVE.xattr.", 17) == 0) 1969 pax_attribute_xattr(entry, key, value); 1970 break; 1971 case 'S': 1972 /* We support some keys used by the "star" archiver */ 1973 if (strcmp(key, "SCHILY.acl.access") == 0) { 1974 r = pax_attribute_acl(a, tar, entry, value, 1975 ARCHIVE_ENTRY_ACL_TYPE_ACCESS); 1976 if (r == ARCHIVE_FATAL) 1977 return (r); 1978 } else if (strcmp(key, "SCHILY.acl.default") == 0) { 1979 r = pax_attribute_acl(a, tar, entry, value, 1980 ARCHIVE_ENTRY_ACL_TYPE_DEFAULT); 1981 if (r == ARCHIVE_FATAL) 1982 return (r); 1983 } else if (strcmp(key, "SCHILY.acl.ace") == 0) { 1984 r = pax_attribute_acl(a, tar, entry, value, 1985 ARCHIVE_ENTRY_ACL_TYPE_NFS4); 1986 if (r == ARCHIVE_FATAL) 1987 return (r); 1988 } else if (strcmp(key, "SCHILY.devmajor") == 0) { 1989 archive_entry_set_rdevmajor(entry, 1990 (dev_t)tar_atol10(value, strlen(value))); 1991 } else if (strcmp(key, "SCHILY.devminor") == 0) { 1992 archive_entry_set_rdevminor(entry, 1993 (dev_t)tar_atol10(value, strlen(value))); 1994 } else if (strcmp(key, "SCHILY.fflags") == 0) { 1995 archive_entry_copy_fflags_text(entry, value); 1996 } else if (strcmp(key, "SCHILY.dev") == 0) { 1997 archive_entry_set_dev(entry, 1998 (dev_t)tar_atol10(value, strlen(value))); 1999 } else if (strcmp(key, "SCHILY.ino") == 0) { 2000 archive_entry_set_ino(entry, 2001 tar_atol10(value, strlen(value))); 2002 } else if (strcmp(key, "SCHILY.nlink") == 0) { 2003 archive_entry_set_nlink(entry, (unsigned) 2004 tar_atol10(value, strlen(value))); 2005 } else if (strcmp(key, "SCHILY.realsize") == 0) { 2006 tar->realsize = tar_atol10(value, strlen(value)); 2007 tar->realsize_override = 1; 2008 archive_entry_set_size(entry, tar->realsize); 2009 } else if (strncmp(key, "SCHILY.xattr.", 13) == 0) { 2010 pax_attribute_schily_xattr(entry, key, value, 2011 value_length); 2012 } else if (strcmp(key, "SUN.holesdata") == 0) { 2013 /* A Solaris extension for sparse. */ 2014 r = solaris_sparse_parse(a, tar, entry, value); 2015 if (r < err) { 2016 if (r == ARCHIVE_FATAL) 2017 return (r); 2018 err = r; 2019 archive_set_error(&a->archive, 2020 ARCHIVE_ERRNO_MISC, 2021 "Parse error: SUN.holesdata"); 2022 } 2023 } 2024 break; 2025 case 'a': 2026 if (strcmp(key, "atime") == 0) { 2027 pax_time(value, &s, &n); 2028 archive_entry_set_atime(entry, s, n); 2029 } 2030 break; 2031 case 'c': 2032 if (strcmp(key, "ctime") == 0) { 2033 pax_time(value, &s, &n); 2034 archive_entry_set_ctime(entry, s, n); 2035 } else if (strcmp(key, "charset") == 0) { 2036 /* TODO: Publish charset information in entry. */ 2037 } else if (strcmp(key, "comment") == 0) { 2038 /* TODO: Publish comment in entry. */ 2039 } 2040 break; 2041 case 'g': 2042 if (strcmp(key, "gid") == 0) { 2043 archive_entry_set_gid(entry, 2044 tar_atol10(value, strlen(value))); 2045 } else if (strcmp(key, "gname") == 0) { 2046 archive_strcpy(&(tar->entry_gname), value); 2047 } 2048 break; 2049 case 'h': 2050 if (strcmp(key, "hdrcharset") == 0) { 2051 if (strcmp(value, "BINARY") == 0) 2052 /* Binary mode. */ 2053 tar->pax_hdrcharset_binary = 1; 2054 else if (strcmp(value, "ISO-IR 10646 2000 UTF-8") == 0) 2055 tar->pax_hdrcharset_binary = 0; 2056 } 2057 break; 2058 case 'l': 2059 /* pax interchange doesn't distinguish hardlink vs. symlink. */ 2060 if (strcmp(key, "linkpath") == 0) { 2061 archive_strcpy(&(tar->entry_linkpath), value); 2062 } 2063 break; 2064 case 'm': 2065 if (strcmp(key, "mtime") == 0) { 2066 pax_time(value, &s, &n); 2067 archive_entry_set_mtime(entry, s, n); 2068 } 2069 break; 2070 case 'p': 2071 if (strcmp(key, "path") == 0) { 2072 archive_strcpy(&(tar->entry_pathname), value); 2073 } 2074 break; 2075 case 'r': 2076 /* POSIX has reserved 'realtime.*' */ 2077 break; 2078 case 's': 2079 /* POSIX has reserved 'security.*' */ 2080 /* Someday: if (strcmp(key, "security.acl") == 0) { ... } */ 2081 if (strcmp(key, "size") == 0) { 2082 /* "size" is the size of the data in the entry. */ 2083 tar->entry_bytes_remaining 2084 = tar_atol10(value, strlen(value)); 2085 /* 2086 * The "size" pax header keyword always overrides the 2087 * "size" field in the tar header. 2088 * GNU.sparse.realsize, GNU.sparse.size and 2089 * SCHILY.realsize override this value. 2090 */ 2091 if (!tar->realsize_override) { 2092 archive_entry_set_size(entry, 2093 tar->entry_bytes_remaining); 2094 tar->realsize 2095 = tar->entry_bytes_remaining; 2096 } 2097 } 2098 break; 2099 case 'u': 2100 if (strcmp(key, "uid") == 0) { 2101 archive_entry_set_uid(entry, 2102 tar_atol10(value, strlen(value))); 2103 } else if (strcmp(key, "uname") == 0) { 2104 archive_strcpy(&(tar->entry_uname), value); 2105 } 2106 break; 2107 } 2108 return (err); 2109} 2110 2111 2112 2113/* 2114 * parse a decimal time value, which may include a fractional portion 2115 */ 2116static void 2117pax_time(const char *p, int64_t *ps, long *pn) 2118{ 2119 char digit; 2120 int64_t s; 2121 unsigned long l; 2122 int sign; 2123 int64_t limit, last_digit_limit; 2124 2125 limit = INT64_MAX / 10; 2126 last_digit_limit = INT64_MAX % 10; 2127 2128 s = 0; 2129 sign = 1; 2130 if (*p == '-') { 2131 sign = -1; 2132 p++; 2133 } 2134 while (*p >= '0' && *p <= '9') { 2135 digit = *p - '0'; 2136 if (s > limit || 2137 (s == limit && digit > last_digit_limit)) { 2138 s = INT64_MAX; 2139 break; 2140 } 2141 s = (s * 10) + digit; 2142 ++p; 2143 } 2144 2145 *ps = s * sign; 2146 2147 /* Calculate nanoseconds. */ 2148 *pn = 0; 2149 2150 if (*p != '.') 2151 return; 2152 2153 l = 100000000UL; 2154 do { 2155 ++p; 2156 if (*p >= '0' && *p <= '9') 2157 *pn += (*p - '0') * l; 2158 else 2159 break; 2160 } while (l /= 10); 2161} 2162 2163/* 2164 * Parse GNU tar header 2165 */ 2166static int 2167header_gnutar(struct archive_read *a, struct tar *tar, 2168 struct archive_entry *entry, const void *h, size_t *unconsumed) 2169{ 2170 const struct archive_entry_header_gnutar *header; 2171 int64_t t; 2172 int err = ARCHIVE_OK; 2173 2174 /* 2175 * GNU header is like POSIX ustar, except 'prefix' is 2176 * replaced with some other fields. This also means the 2177 * filename is stored as in old-style archives. 2178 */ 2179 2180 /* Grab fields common to all tar variants. */ 2181 err = header_common(a, tar, entry, h); 2182 if (err == ARCHIVE_FATAL) 2183 return (err); 2184 2185 /* Copy filename over (to ensure null termination). */ 2186 header = (const struct archive_entry_header_gnutar *)h; 2187 if (archive_entry_copy_pathname_l(entry, 2188 header->name, sizeof(header->name), tar->sconv) != 0) { 2189 err = set_conversion_failed_error(a, tar->sconv, "Pathname"); 2190 if (err == ARCHIVE_FATAL) 2191 return (err); 2192 } 2193 2194 /* Fields common to ustar and GNU */ 2195 /* XXX Can the following be factored out since it's common 2196 * to ustar and gnu tar? Is it okay to move it down into 2197 * header_common, perhaps? */ 2198 if (archive_entry_copy_uname_l(entry, 2199 header->uname, sizeof(header->uname), tar->sconv) != 0) { 2200 err = set_conversion_failed_error(a, tar->sconv, "Uname"); 2201 if (err == ARCHIVE_FATAL) 2202 return (err); 2203 } 2204 2205 if (archive_entry_copy_gname_l(entry, 2206 header->gname, sizeof(header->gname), tar->sconv) != 0) { 2207 err = set_conversion_failed_error(a, tar->sconv, "Gname"); 2208 if (err == ARCHIVE_FATAL) 2209 return (err); 2210 } 2211 2212 /* Parse out device numbers only for char and block specials */ 2213 if (header->typeflag[0] == '3' || header->typeflag[0] == '4') { 2214 archive_entry_set_rdevmajor(entry, (dev_t) 2215 tar_atol(header->rdevmajor, sizeof(header->rdevmajor))); 2216 archive_entry_set_rdevminor(entry, (dev_t) 2217 tar_atol(header->rdevminor, sizeof(header->rdevminor))); 2218 } else 2219 archive_entry_set_rdev(entry, 0); 2220 2221 tar->entry_padding = 0x1ff & (-tar->entry_bytes_remaining); 2222 2223 /* Grab GNU-specific fields. */ 2224 t = tar_atol(header->atime, sizeof(header->atime)); 2225 if (t > 0) 2226 archive_entry_set_atime(entry, t, 0); 2227 t = tar_atol(header->ctime, sizeof(header->ctime)); 2228 if (t > 0) 2229 archive_entry_set_ctime(entry, t, 0); 2230 2231 if (header->realsize[0] != 0) { 2232 tar->realsize 2233 = tar_atol(header->realsize, sizeof(header->realsize)); 2234 archive_entry_set_size(entry, tar->realsize); 2235 tar->realsize_override = 1; 2236 } 2237 2238 if (header->sparse[0].offset[0] != 0) { 2239 if (gnu_sparse_old_read(a, tar, header, unconsumed) 2240 != ARCHIVE_OK) 2241 return (ARCHIVE_FATAL); 2242 } else { 2243 if (header->isextended[0] != 0) { 2244 /* XXX WTF? XXX */ 2245 } 2246 } 2247 2248 return (err); 2249} 2250 2251static int 2252gnu_add_sparse_entry(struct archive_read *a, struct tar *tar, 2253 int64_t offset, int64_t remaining) 2254{ 2255 struct sparse_block *p; 2256 2257 p = (struct sparse_block *)calloc(1, sizeof(*p)); 2258 if (p == NULL) { 2259 archive_set_error(&a->archive, ENOMEM, "Out of memory"); 2260 return (ARCHIVE_FATAL); 2261 } 2262 if (tar->sparse_last != NULL) 2263 tar->sparse_last->next = p; 2264 else 2265 tar->sparse_list = p; 2266 tar->sparse_last = p; 2267 if (remaining < 0 || offset < 0 || offset > INT64_MAX - remaining) { 2268 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, "Malformed sparse map data"); 2269 return (ARCHIVE_FATAL); 2270 } 2271 p->offset = offset; 2272 p->remaining = remaining; 2273 return (ARCHIVE_OK); 2274} 2275 2276static void 2277gnu_clear_sparse_list(struct tar *tar) 2278{ 2279 struct sparse_block *p; 2280 2281 while (tar->sparse_list != NULL) { 2282 p = tar->sparse_list; 2283 tar->sparse_list = p->next; 2284 free(p); 2285 } 2286 tar->sparse_last = NULL; 2287} 2288 2289/* 2290 * GNU tar old-format sparse data. 2291 * 2292 * GNU old-format sparse data is stored in a fixed-field 2293 * format. Offset/size values are 11-byte octal fields (same 2294 * format as 'size' field in ustart header). These are 2295 * stored in the header, allocating subsequent header blocks 2296 * as needed. Extending the header in this way is a pretty 2297 * severe POSIX violation; this design has earned GNU tar a 2298 * lot of criticism. 2299 */ 2300 2301static int 2302gnu_sparse_old_read(struct archive_read *a, struct tar *tar, 2303 const struct archive_entry_header_gnutar *header, size_t *unconsumed) 2304{ 2305 ssize_t bytes_read; 2306 const void *data; 2307 struct extended { 2308 struct gnu_sparse sparse[21]; 2309 char isextended[1]; 2310 char padding[7]; 2311 }; 2312 const struct extended *ext; 2313 2314 if (gnu_sparse_old_parse(a, tar, header->sparse, 4) != ARCHIVE_OK) 2315 return (ARCHIVE_FATAL); 2316 if (header->isextended[0] == 0) 2317 return (ARCHIVE_OK); 2318 2319 do { 2320 tar_flush_unconsumed(a, unconsumed); 2321 data = __archive_read_ahead(a, 512, &bytes_read); 2322 if (bytes_read < 0) 2323 return (ARCHIVE_FATAL); 2324 if (bytes_read < 512) { 2325 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 2326 "Truncated tar archive " 2327 "detected while reading sparse file data"); 2328 return (ARCHIVE_FATAL); 2329 } 2330 *unconsumed = 512; 2331 ext = (const struct extended *)data; 2332 if (gnu_sparse_old_parse(a, tar, ext->sparse, 21) != ARCHIVE_OK) 2333 return (ARCHIVE_FATAL); 2334 } while (ext->isextended[0] != 0); 2335 if (tar->sparse_list != NULL) 2336 tar->entry_offset = tar->sparse_list->offset; 2337 return (ARCHIVE_OK); 2338} 2339 2340static int 2341gnu_sparse_old_parse(struct archive_read *a, struct tar *tar, 2342 const struct gnu_sparse *sparse, int length) 2343{ 2344 while (length > 0 && sparse->offset[0] != 0) { 2345 if (gnu_add_sparse_entry(a, tar, 2346 tar_atol(sparse->offset, sizeof(sparse->offset)), 2347 tar_atol(sparse->numbytes, sizeof(sparse->numbytes))) 2348 != ARCHIVE_OK) 2349 return (ARCHIVE_FATAL); 2350 sparse++; 2351 length--; 2352 } 2353 return (ARCHIVE_OK); 2354} 2355 2356/* 2357 * GNU tar sparse format 0.0 2358 * 2359 * Beginning with GNU tar 1.15, sparse files are stored using 2360 * information in the pax extended header. The GNU tar maintainers 2361 * have gone through a number of variations in the process of working 2362 * out this scheme; fortunately, they're all numbered. 2363 * 2364 * Sparse format 0.0 uses attribute GNU.sparse.numblocks to store the 2365 * number of blocks, and GNU.sparse.offset/GNU.sparse.numbytes to 2366 * store offset/size for each block. The repeated instances of these 2367 * latter fields violate the pax specification (which frowns on 2368 * duplicate keys), so this format was quickly replaced. 2369 */ 2370 2371/* 2372 * GNU tar sparse format 0.1 2373 * 2374 * This version replaced the offset/numbytes attributes with 2375 * a single "map" attribute that stored a list of integers. This 2376 * format had two problems: First, the "map" attribute could be very 2377 * long, which caused problems for some implementations. More 2378 * importantly, the sparse data was lost when extracted by archivers 2379 * that didn't recognize this extension. 2380 */ 2381 2382static int 2383gnu_sparse_01_parse(struct archive_read *a, struct tar *tar, const char *p) 2384{ 2385 const char *e; 2386 int64_t offset = -1, size = -1; 2387 2388 for (;;) { 2389 e = p; 2390 while (*e != '\0' && *e != ',') { 2391 if (*e < '0' || *e > '9') 2392 return (ARCHIVE_WARN); 2393 e++; 2394 } 2395 if (offset < 0) { 2396 offset = tar_atol10(p, e - p); 2397 if (offset < 0) 2398 return (ARCHIVE_WARN); 2399 } else { 2400 size = tar_atol10(p, e - p); 2401 if (size < 0) 2402 return (ARCHIVE_WARN); 2403 if (gnu_add_sparse_entry(a, tar, offset, size) 2404 != ARCHIVE_OK) 2405 return (ARCHIVE_FATAL); 2406 offset = -1; 2407 } 2408 if (*e == '\0') 2409 return (ARCHIVE_OK); 2410 p = e + 1; 2411 } 2412} 2413 2414/* 2415 * GNU tar sparse format 1.0 2416 * 2417 * The idea: The offset/size data is stored as a series of base-10 2418 * ASCII numbers prepended to the file data, so that dearchivers that 2419 * don't support this format will extract the block map along with the 2420 * data and a separate post-process can restore the sparseness. 2421 * 2422 * Unfortunately, GNU tar 1.16 had a bug that added unnecessary 2423 * padding to the body of the file when using this format. GNU tar 2424 * 1.17 corrected this bug without bumping the version number, so 2425 * it's not possible to support both variants. This code supports 2426 * the later variant at the expense of not supporting the former. 2427 * 2428 * This variant also replaced GNU.sparse.size with GNU.sparse.realsize 2429 * and introduced the GNU.sparse.major/GNU.sparse.minor attributes. 2430 */ 2431 2432/* 2433 * Read the next line from the input, and parse it as a decimal 2434 * integer followed by '\n'. Returns positive integer value or 2435 * negative on error. 2436 */ 2437static int64_t 2438gnu_sparse_10_atol(struct archive_read *a, struct tar *tar, 2439 int64_t *remaining, size_t *unconsumed) 2440{ 2441 int64_t l, limit, last_digit_limit; 2442 const char *p; 2443 ssize_t bytes_read; 2444 int base, digit; 2445 2446 base = 10; 2447 limit = INT64_MAX / base; 2448 last_digit_limit = INT64_MAX % base; 2449 2450 /* 2451 * Skip any lines starting with '#'; GNU tar specs 2452 * don't require this, but they should. 2453 */ 2454 do { 2455 bytes_read = readline(a, tar, &p, 2456 (ssize_t)tar_min(*remaining, 100), unconsumed); 2457 if (bytes_read <= 0) 2458 return (ARCHIVE_FATAL); 2459 *remaining -= bytes_read; 2460 } while (p[0] == '#'); 2461 2462 l = 0; 2463 while (bytes_read > 0) { 2464 if (*p == '\n') 2465 return (l); 2466 if (*p < '0' || *p >= '0' + base) 2467 return (ARCHIVE_WARN); 2468 digit = *p - '0'; 2469 if (l > limit || (l == limit && digit > last_digit_limit)) 2470 l = INT64_MAX; /* Truncate on overflow. */ 2471 else 2472 l = (l * base) + digit; 2473 p++; 2474 bytes_read--; 2475 } 2476 /* TODO: Error message. */ 2477 return (ARCHIVE_WARN); 2478} 2479 2480/* 2481 * Returns length (in bytes) of the sparse data description 2482 * that was read. 2483 */ 2484static ssize_t 2485gnu_sparse_10_read(struct archive_read *a, struct tar *tar, size_t *unconsumed) 2486{ 2487 ssize_t bytes_read; 2488 int entries; 2489 int64_t offset, size, to_skip, remaining; 2490 2491 /* Clear out the existing sparse list. */ 2492 gnu_clear_sparse_list(tar); 2493 2494 remaining = tar->entry_bytes_remaining; 2495 2496 /* Parse entries. */ 2497 entries = (int)gnu_sparse_10_atol(a, tar, &remaining, unconsumed); 2498 if (entries < 0) 2499 return (ARCHIVE_FATAL); 2500 /* Parse the individual entries. */ 2501 while (entries-- > 0) { 2502 /* Parse offset/size */ 2503 offset = gnu_sparse_10_atol(a, tar, &remaining, unconsumed); 2504 if (offset < 0) 2505 return (ARCHIVE_FATAL); 2506 size = gnu_sparse_10_atol(a, tar, &remaining, unconsumed); 2507 if (size < 0) 2508 return (ARCHIVE_FATAL); 2509 /* Add a new sparse entry. */ 2510 if (gnu_add_sparse_entry(a, tar, offset, size) != ARCHIVE_OK) 2511 return (ARCHIVE_FATAL); 2512 } 2513 /* Skip rest of block... */ 2514 tar_flush_unconsumed(a, unconsumed); 2515 bytes_read = (ssize_t)(tar->entry_bytes_remaining - remaining); 2516 to_skip = 0x1ff & -bytes_read; 2517 /* Fail if tar->entry_bytes_remaing would get negative */ 2518 if (to_skip > remaining) 2519 return (ARCHIVE_FATAL); 2520 if (to_skip != __archive_read_consume(a, to_skip)) 2521 return (ARCHIVE_FATAL); 2522 return ((ssize_t)(bytes_read + to_skip)); 2523} 2524 2525/* 2526 * Solaris pax extension for a sparse file. This is recorded with the 2527 * data and hole pairs. The way recording sparse information by Solaris' 2528 * pax simply indicates where data and sparse are, so the stored contents 2529 * consist of both data and hole. 2530 */ 2531static int 2532solaris_sparse_parse(struct archive_read *a, struct tar *tar, 2533 struct archive_entry *entry, const char *p) 2534{ 2535 const char *e; 2536 int64_t start, end; 2537 int hole = 1; 2538 2539 (void)entry; /* UNUSED */ 2540 2541 end = 0; 2542 if (*p == ' ') 2543 p++; 2544 else 2545 return (ARCHIVE_WARN); 2546 for (;;) { 2547 e = p; 2548 while (*e != '\0' && *e != ' ') { 2549 if (*e < '0' || *e > '9') 2550 return (ARCHIVE_WARN); 2551 e++; 2552 } 2553 start = end; 2554 end = tar_atol10(p, e - p); 2555 if (end < 0) 2556 return (ARCHIVE_WARN); 2557 if (start < end) { 2558 if (gnu_add_sparse_entry(a, tar, start, 2559 end - start) != ARCHIVE_OK) 2560 return (ARCHIVE_FATAL); 2561 tar->sparse_last->hole = hole; 2562 } 2563 if (*e == '\0') 2564 return (ARCHIVE_OK); 2565 p = e + 1; 2566 hole = hole == 0; 2567 } 2568} 2569 2570/*- 2571 * Convert text->integer. 2572 * 2573 * Traditional tar formats (including POSIX) specify base-8 for 2574 * all of the standard numeric fields. This is a significant limitation 2575 * in practice: 2576 * = file size is limited to 8GB 2577 * = rdevmajor and rdevminor are limited to 21 bits 2578 * = uid/gid are limited to 21 bits 2579 * 2580 * There are two workarounds for this: 2581 * = pax extended headers, which use variable-length string fields 2582 * = GNU tar and STAR both allow either base-8 or base-256 in 2583 * most fields. The high bit is set to indicate base-256. 2584 * 2585 * On read, this implementation supports both extensions. 2586 */ 2587static int64_t 2588tar_atol(const char *p, size_t char_cnt) 2589{ 2590 /* 2591 * Technically, GNU tar considers a field to be in base-256 2592 * only if the first byte is 0xff or 0x80. 2593 */ 2594 if (*p & 0x80) 2595 return (tar_atol256(p, char_cnt)); 2596 return (tar_atol8(p, char_cnt)); 2597} 2598 2599/* 2600 * Note that this implementation does not (and should not!) obey 2601 * locale settings; you cannot simply substitute strtol here, since 2602 * it does obey locale. 2603 */ 2604static int64_t 2605tar_atol_base_n(const char *p, size_t char_cnt, int base) 2606{ 2607 int64_t l, maxval, limit, last_digit_limit; 2608 int digit, sign; 2609 2610 maxval = INT64_MAX; 2611 limit = INT64_MAX / base; 2612 last_digit_limit = INT64_MAX % base; 2613 2614 /* the pointer will not be dereferenced if char_cnt is zero 2615 * due to the way the && operator is evaluated. 2616 */ 2617 while (char_cnt != 0 && (*p == ' ' || *p == '\t')) { 2618 p++; 2619 char_cnt--; 2620 } 2621 2622 sign = 1; 2623 if (char_cnt != 0 && *p == '-') { 2624 sign = -1; 2625 p++; 2626 char_cnt--; 2627 2628 maxval = INT64_MIN; 2629 limit = -(INT64_MIN / base); 2630 last_digit_limit = INT64_MIN % base; 2631 } 2632 2633 l = 0; 2634 if (char_cnt != 0) { 2635 digit = *p - '0'; 2636 while (digit >= 0 && digit < base && char_cnt != 0) { 2637 if (l>limit || (l == limit && digit > last_digit_limit)) { 2638 return maxval; /* Truncate on overflow. */ 2639 } 2640 l = (l * base) + digit; 2641 digit = *++p - '0'; 2642 char_cnt--; 2643 } 2644 } 2645 return (sign < 0) ? -l : l; 2646} 2647 2648static int64_t 2649tar_atol8(const char *p, size_t char_cnt) 2650{ 2651 return tar_atol_base_n(p, char_cnt, 8); 2652} 2653 2654static int64_t 2655tar_atol10(const char *p, size_t char_cnt) 2656{ 2657 return tar_atol_base_n(p, char_cnt, 10); 2658} 2659 2660/* 2661 * Parse a base-256 integer. This is just a variable-length 2662 * twos-complement signed binary value in big-endian order, except 2663 * that the high-order bit is ignored. The values here can be up to 2664 * 12 bytes, so we need to be careful about overflowing 64-bit 2665 * (8-byte) integers. 2666 * 2667 * This code unashamedly assumes that the local machine uses 8-bit 2668 * bytes and twos-complement arithmetic. 2669 */ 2670static int64_t 2671tar_atol256(const char *_p, size_t char_cnt) 2672{ 2673 uint64_t l; 2674 const unsigned char *p = (const unsigned char *)_p; 2675 unsigned char c, neg; 2676 2677 /* Extend 7-bit 2s-comp to 8-bit 2s-comp, decide sign. */ 2678 c = *p; 2679 if (c & 0x40) { 2680 neg = 0xff; 2681 c |= 0x80; 2682 l = ~ARCHIVE_LITERAL_ULL(0); 2683 } else { 2684 neg = 0; 2685 c &= 0x7f; 2686 l = 0; 2687 } 2688 2689 /* If more than 8 bytes, check that we can ignore 2690 * high-order bits without overflow. */ 2691 while (char_cnt > sizeof(int64_t)) { 2692 --char_cnt; 2693 if (c != neg) 2694 return neg ? INT64_MIN : INT64_MAX; 2695 c = *++p; 2696 } 2697 2698 /* c is first byte that fits; if sign mismatch, return overflow */ 2699 if ((c ^ neg) & 0x80) { 2700 return neg ? INT64_MIN : INT64_MAX; 2701 } 2702 2703 /* Accumulate remaining bytes. */ 2704 while (--char_cnt > 0) { 2705 l = (l << 8) | c; 2706 c = *++p; 2707 } 2708 l = (l << 8) | c; 2709 /* Return signed twos-complement value. */ 2710 return (int64_t)(l); 2711} 2712 2713/* 2714 * Returns length of line (including trailing newline) 2715 * or negative on error. 'start' argument is updated to 2716 * point to first character of line. This avoids copying 2717 * when possible. 2718 */ 2719static ssize_t 2720readline(struct archive_read *a, struct tar *tar, const char **start, 2721 ssize_t limit, size_t *unconsumed) 2722{ 2723 ssize_t bytes_read; 2724 ssize_t total_size = 0; 2725 const void *t; 2726 const char *s; 2727 void *p; 2728 2729 tar_flush_unconsumed(a, unconsumed); 2730 2731 t = __archive_read_ahead(a, 1, &bytes_read); 2732 if (bytes_read <= 0) 2733 return (ARCHIVE_FATAL); 2734 s = t; /* Start of line? */ 2735 p = memchr(t, '\n', bytes_read); 2736 /* If we found '\n' in the read buffer, return pointer to that. */ 2737 if (p != NULL) { 2738 bytes_read = 1 + ((const char *)p) - s; 2739 if (bytes_read > limit) { 2740 archive_set_error(&a->archive, 2741 ARCHIVE_ERRNO_FILE_FORMAT, 2742 "Line too long"); 2743 return (ARCHIVE_FATAL); 2744 } 2745 *unconsumed = bytes_read; 2746 *start = s; 2747 return (bytes_read); 2748 } 2749 *unconsumed = bytes_read; 2750 /* Otherwise, we need to accumulate in a line buffer. */ 2751 for (;;) { 2752 if (total_size + bytes_read > limit) { 2753 archive_set_error(&a->archive, 2754 ARCHIVE_ERRNO_FILE_FORMAT, 2755 "Line too long"); 2756 return (ARCHIVE_FATAL); 2757 } 2758 if (archive_string_ensure(&tar->line, total_size + bytes_read) == NULL) { 2759 archive_set_error(&a->archive, ENOMEM, 2760 "Can't allocate working buffer"); 2761 return (ARCHIVE_FATAL); 2762 } 2763 memcpy(tar->line.s + total_size, t, bytes_read); 2764 tar_flush_unconsumed(a, unconsumed); 2765 total_size += bytes_read; 2766 /* If we found '\n', clean up and return. */ 2767 if (p != NULL) { 2768 *start = tar->line.s; 2769 return (total_size); 2770 } 2771 /* Read some more. */ 2772 t = __archive_read_ahead(a, 1, &bytes_read); 2773 if (bytes_read <= 0) 2774 return (ARCHIVE_FATAL); 2775 s = t; /* Start of line? */ 2776 p = memchr(t, '\n', bytes_read); 2777 /* If we found '\n', trim the read. */ 2778 if (p != NULL) { 2779 bytes_read = 1 + ((const char *)p) - s; 2780 } 2781 *unconsumed = bytes_read; 2782 } 2783} 2784 2785/* 2786 * base64_decode - Base64 decode 2787 * 2788 * This accepts most variations of base-64 encoding, including: 2789 * * with or without line breaks 2790 * * with or without the final group padded with '=' or '_' characters 2791 * (The most economical Base-64 variant does not pad the last group and 2792 * omits line breaks; RFC1341 used for MIME requires both.) 2793 */ 2794static char * 2795base64_decode(const char *s, size_t len, size_t *out_len) 2796{ 2797 static const unsigned char digits[64] = { 2798 'A','B','C','D','E','F','G','H','I','J','K','L','M','N', 2799 'O','P','Q','R','S','T','U','V','W','X','Y','Z','a','b', 2800 'c','d','e','f','g','h','i','j','k','l','m','n','o','p', 2801 'q','r','s','t','u','v','w','x','y','z','0','1','2','3', 2802 '4','5','6','7','8','9','+','/' }; 2803 static unsigned char decode_table[128]; 2804 char *out, *d; 2805 const unsigned char *src = (const unsigned char *)s; 2806 2807 /* If the decode table is not yet initialized, prepare it. */ 2808 if (decode_table[digits[1]] != 1) { 2809 unsigned i; 2810 memset(decode_table, 0xff, sizeof(decode_table)); 2811 for (i = 0; i < sizeof(digits); i++) 2812 decode_table[digits[i]] = i; 2813 } 2814 2815 /* Allocate enough space to hold the entire output. */ 2816 /* Note that we may not use all of this... */ 2817 out = (char *)malloc(len - len / 4 + 1); 2818 if (out == NULL) { 2819 *out_len = 0; 2820 return (NULL); 2821 } 2822 d = out; 2823 2824 while (len > 0) { 2825 /* Collect the next group of (up to) four characters. */ 2826 int v = 0; 2827 int group_size = 0; 2828 while (group_size < 4 && len > 0) { 2829 /* '=' or '_' padding indicates final group. */ 2830 if (*src == '=' || *src == '_') { 2831 len = 0; 2832 break; 2833 } 2834 /* Skip illegal characters (including line breaks) */ 2835 if (*src > 127 || *src < 32 2836 || decode_table[*src] == 0xff) { 2837 len--; 2838 src++; 2839 continue; 2840 } 2841 v <<= 6; 2842 v |= decode_table[*src++]; 2843 len --; 2844 group_size++; 2845 } 2846 /* Align a short group properly. */ 2847 v <<= 6 * (4 - group_size); 2848 /* Unpack the group we just collected. */ 2849 switch (group_size) { 2850 case 4: d[2] = v & 0xff; 2851 /* FALLTHROUGH */ 2852 case 3: d[1] = (v >> 8) & 0xff; 2853 /* FALLTHROUGH */ 2854 case 2: d[0] = (v >> 16) & 0xff; 2855 break; 2856 case 1: /* this is invalid! */ 2857 break; 2858 } 2859 d += group_size * 3 / 4; 2860 } 2861 2862 *out_len = d - out; 2863 return (out); 2864} 2865 2866static char * 2867url_decode(const char *in) 2868{ 2869 char *out, *d; 2870 const char *s; 2871 2872 out = (char *)malloc(strlen(in) + 1); 2873 if (out == NULL) 2874 return (NULL); 2875 for (s = in, d = out; *s != '\0'; ) { 2876 if (s[0] == '%' && s[1] != '\0' && s[2] != '\0') { 2877 /* Try to convert % escape */ 2878 int digit1 = tohex(s[1]); 2879 int digit2 = tohex(s[2]); 2880 if (digit1 >= 0 && digit2 >= 0) { 2881 /* Looks good, consume three chars */ 2882 s += 3; 2883 /* Convert output */ 2884 *d++ = ((digit1 << 4) | digit2); 2885 continue; 2886 } 2887 /* Else fall through and treat '%' as normal char */ 2888 } 2889 *d++ = *s++; 2890 } 2891 *d = '\0'; 2892 return (out); 2893} 2894 2895static int 2896tohex(int c) 2897{ 2898 if (c >= '0' && c <= '9') 2899 return (c - '0'); 2900 else if (c >= 'A' && c <= 'F') 2901 return (c - 'A' + 10); 2902 else if (c >= 'a' && c <= 'f') 2903 return (c - 'a' + 10); 2904 else 2905 return (-1); 2906} 2907