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: head/lib/libarchive/archive_read_support_format_tar.c 201161 2009-12-29 05:44:39Z kientzle $"); 30 31 #ifdef HAVE_ERRNO_H 32 #include <errno.h> 33 #endif 34 #include <stddef.h> 35 #ifdef HAVE_STDLIB_H 36 #include <stdlib.h> 37 #endif 38 #ifdef HAVE_STRING_H 39 #include <string.h> 40 #endif 41 42 #include "archive.h" 43 #include "archive_acl_private.h" /* For ACL parsing routines. */ 44 #include "archive_entry.h" 45 #include "archive_entry_locale.h" 46 #include "archive_private.h" 47 #include "archive_read_private.h" 48 49 #define tar_min(a,b) ((a) < (b) ? (a) : (b)) 50 51 /* 52 * Layout of POSIX 'ustar' tar header. 53 */ 54 struct archive_entry_header_ustar { 55 char name[100]; 56 char mode[8]; 57 char uid[8]; 58 char gid[8]; 59 char size[12]; 60 char mtime[12]; 61 char checksum[8]; 62 char typeflag[1]; 63 char linkname[100]; /* "old format" header ends here */ 64 char magic[6]; /* For POSIX: "ustar\0" */ 65 char version[2]; /* For POSIX: "00" */ 66 char uname[32]; 67 char gname[32]; 68 char rdevmajor[8]; 69 char rdevminor[8]; 70 char prefix[155]; 71 }; 72 73 /* 74 * Structure of GNU tar header 75 */ 76 struct gnu_sparse { 77 char offset[12]; 78 char numbytes[12]; 79 }; 80 81 struct archive_entry_header_gnutar { 82 char name[100]; 83 char mode[8]; 84 char uid[8]; 85 char gid[8]; 86 char size[12]; 87 char mtime[12]; 88 char checksum[8]; 89 char typeflag[1]; 90 char linkname[100]; 91 char magic[8]; /* "ustar \0" (note blank/blank/null at end) */ 92 char uname[32]; 93 char gname[32]; 94 char rdevmajor[8]; 95 char rdevminor[8]; 96 char atime[12]; 97 char ctime[12]; 98 char offset[12]; 99 char longnames[4]; 100 char unused[1]; 101 struct gnu_sparse sparse[4]; 102 char isextended[1]; 103 char realsize[12]; 104 /* 105 * Old GNU format doesn't use POSIX 'prefix' field; they use 106 * the 'L' (longname) entry instead. 107 */ 108 }; 109 110 /* 111 * Data specific to this format. 112 */ 113 struct sparse_block { 114 struct sparse_block *next; 115 int64_t offset; 116 int64_t remaining; 117 int hole; 118 }; 119 120 struct tar { 121 struct archive_string acl_text; 122 struct archive_string entry_pathname; 123 /* For "GNU.sparse.name" and other similar path extensions. */ 124 struct archive_string entry_pathname_override; 125 struct archive_string entry_linkpath; 126 struct archive_string entry_uname; 127 struct archive_string entry_gname; 128 struct archive_string longlink; 129 struct archive_string longname; 130 struct archive_string pax_header; 131 struct archive_string pax_global; 132 struct archive_string line; 133 int pax_hdrcharset_binary; 134 int header_recursion_depth; 135 int64_t entry_bytes_remaining; 136 int64_t entry_offset; 137 int64_t entry_padding; 138 int64_t entry_bytes_unconsumed; 139 int64_t realsize; 140 int sparse_allowed; 141 struct sparse_block *sparse_list; 142 struct sparse_block *sparse_last; 143 int64_t sparse_offset; 144 int64_t sparse_numbytes; 145 int sparse_gnu_major; 146 int sparse_gnu_minor; 147 char sparse_gnu_pending; 148 149 struct archive_string localname; 150 struct archive_string_conv *opt_sconv; 151 struct archive_string_conv *sconv; 152 struct archive_string_conv *sconv_acl; 153 struct archive_string_conv *sconv_default; 154 int init_default_conversion; 155 int compat_2x; 156 int process_mac_extensions; 157 int read_concatenated_archives; 158 int realsize_override; 159 }; 160 161 static int archive_block_is_null(const char *p); 162 static char *base64_decode(const char *, size_t, size_t *); 163 static int gnu_add_sparse_entry(struct archive_read *, struct tar *, 164 int64_t offset, int64_t remaining); 165 166 static void gnu_clear_sparse_list(struct tar *); 167 static int gnu_sparse_old_read(struct archive_read *, struct tar *, 168 const struct archive_entry_header_gnutar *header, size_t *); 169 static int gnu_sparse_old_parse(struct archive_read *, struct tar *, 170 const struct gnu_sparse *sparse, int length); 171 static int gnu_sparse_01_parse(struct archive_read *, struct tar *, 172 const char *); 173 static ssize_t gnu_sparse_10_read(struct archive_read *, struct tar *, 174 size_t *); 175 static int header_Solaris_ACL(struct archive_read *, struct tar *, 176 struct archive_entry *, const void *, size_t *); 177 static int header_common(struct archive_read *, struct tar *, 178 struct archive_entry *, const void *); 179 static int header_old_tar(struct archive_read *, struct tar *, 180 struct archive_entry *, const void *); 181 static int header_pax_extensions(struct archive_read *, struct tar *, 182 struct archive_entry *, const void *, size_t *); 183 static int header_pax_global(struct archive_read *, struct tar *, 184 struct archive_entry *, const void *h, size_t *); 185 static int header_longlink(struct archive_read *, struct tar *, 186 struct archive_entry *, const void *h, size_t *); 187 static int header_longname(struct archive_read *, struct tar *, 188 struct archive_entry *, const void *h, size_t *); 189 static int read_mac_metadata_blob(struct archive_read *, struct tar *, 190 struct archive_entry *, const void *h, size_t *); 191 static int header_volume(struct archive_read *, struct tar *, 192 struct archive_entry *, const void *h, size_t *); 193 static int header_ustar(struct archive_read *, struct tar *, 194 struct archive_entry *, const void *h); 195 static int header_gnutar(struct archive_read *, struct tar *, 196 struct archive_entry *, const void *h, size_t *); 197 static int archive_read_format_tar_bid(struct archive_read *, int); 198 static int archive_read_format_tar_options(struct archive_read *, 199 const char *, const char *); 200 static int archive_read_format_tar_cleanup(struct archive_read *); 201 static int archive_read_format_tar_read_data(struct archive_read *a, 202 const void **buff, size_t *size, int64_t *offset); 203 static int archive_read_format_tar_skip(struct archive_read *a); 204 static int archive_read_format_tar_read_header(struct archive_read *, 205 struct archive_entry *); 206 static int checksum(struct archive_read *, const void *); 207 static int pax_attribute(struct archive_read *, struct tar *, 208 struct archive_entry *, const char *key, const char *value, 209 size_t value_length); 210 static int pax_attribute_acl(struct archive_read *, struct tar *, 211 struct archive_entry *, const char *, int); 212 static int pax_attribute_xattr(struct archive_entry *, const char *, 213 const char *); 214 static int pax_header(struct archive_read *, struct tar *, 215 struct archive_entry *, struct archive_string *); 216 static void pax_time(const char *, int64_t *sec, long *nanos); 217 static ssize_t readline(struct archive_read *, struct tar *, const char **, 218 ssize_t limit, size_t *); 219 static int read_body_to_string(struct archive_read *, struct tar *, 220 struct archive_string *, const void *h, size_t *); 221 static int solaris_sparse_parse(struct archive_read *, struct tar *, 222 struct archive_entry *, const char *); 223 static int64_t tar_atol(const char *, size_t); 224 static int64_t tar_atol10(const char *, size_t); 225 static int64_t tar_atol256(const char *, size_t); 226 static int64_t tar_atol8(const char *, size_t); 227 static int tar_read_header(struct archive_read *, struct tar *, 228 struct archive_entry *, size_t *); 229 static int tohex(int c); 230 static char *url_decode(const char *); 231 static void tar_flush_unconsumed(struct archive_read *, size_t *); 232 233 234 int 235 archive_read_support_format_gnutar(struct archive *a) 236 { 237 archive_check_magic(a, ARCHIVE_READ_MAGIC, 238 ARCHIVE_STATE_NEW, "archive_read_support_format_gnutar"); 239 return (archive_read_support_format_tar(a)); 240 } 241 242 243 int 244 archive_read_support_format_tar(struct archive *_a) 245 { 246 struct archive_read *a = (struct archive_read *)_a; 247 struct tar *tar; 248 int r; 249 250 archive_check_magic(_a, ARCHIVE_READ_MAGIC, 251 ARCHIVE_STATE_NEW, "archive_read_support_format_tar"); 252 253 tar = (struct tar *)calloc(1, sizeof(*tar)); 254 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 } 279 280 static int 281 archive_read_format_tar_cleanup(struct archive_read *a) 282 { 283 struct tar *tar; 284 285 tar = (struct tar *)(a->format->data); 286 gnu_clear_sparse_list(tar); 287 archive_string_free(&tar->acl_text); 288 archive_string_free(&tar->entry_pathname); 289 archive_string_free(&tar->entry_pathname_override); 290 archive_string_free(&tar->entry_linkpath); 291 archive_string_free(&tar->entry_uname); 292 archive_string_free(&tar->entry_gname); 293 archive_string_free(&tar->line); 294 archive_string_free(&tar->pax_global); 295 archive_string_free(&tar->pax_header); 296 archive_string_free(&tar->longname); 297 archive_string_free(&tar->longlink); 298 archive_string_free(&tar->localname); 299 free(tar); 300 (a->format->data) = NULL; 301 return (ARCHIVE_OK); 302 } 303 304 /* 305 * Validate number field 306 * 307 * This has to be pretty lenient in order to accommodate the enormous 308 * variety of tar writers in the world: 309 * = POSIX (IEEE Std 1003.1-1988) ustar requires octal values with leading 310 * zeros and allows fields to be terminated with space or null characters 311 * = Many writers use different termination (in particular, libarchive 312 * omits terminator bytes to squeeze one or two more digits) 313 * = Many writers pad with space and omit leading zeros 314 * = GNU tar and star write base-256 values if numbers are too 315 * big to be represented in octal 316 * 317 * Examples of specific tar headers that we should support: 318 * = Perl Archive::Tar terminates uid, gid, devminor and devmajor with two 319 * null bytes, pads size with spaces and other numeric fields with zeroes 320 * = plexus-archiver prior to 2.6.3 (before switching to commons-compress) 321 * may have uid and gid fields filled with spaces without any octal digits 322 * at all and pads all numeric fields with spaces 323 * 324 * This should tolerate all variants in use. It will reject a field 325 * where the writer just left garbage after a trailing NUL. 326 */ 327 static int 328 validate_number_field(const char* p_field, size_t i_size) 329 { 330 unsigned char marker = (unsigned char)p_field[0]; 331 if (marker == 128 || marker == 255 || marker == 0) { 332 /* Base-256 marker, there's nothing we can check. */ 333 return 1; 334 } else { 335 /* Must be octal */ 336 size_t i = 0; 337 /* Skip any leading spaces */ 338 while (i < i_size && p_field[i] == ' ') { 339 ++i; 340 } 341 /* Skip octal digits. */ 342 while (i < i_size && p_field[i] >= '0' && p_field[i] <= '7') { 343 ++i; 344 } 345 /* Any remaining characters must be space or NUL padding. */ 346 while (i < i_size) { 347 if (p_field[i] != ' ' && p_field[i] != 0) { 348 return 0; 349 } 350 ++i; 351 } 352 return 1; 353 } 354 } 355 356 static int 357 archive_read_format_tar_bid(struct archive_read *a, int best_bid) 358 { 359 int bid; 360 const char *h; 361 const struct archive_entry_header_ustar *header; 362 363 (void)best_bid; /* UNUSED */ 364 365 bid = 0; 366 367 /* Now let's look at the actual header and see if it matches. */ 368 h = __archive_read_ahead(a, 512, NULL); 369 if (h == NULL) 370 return (-1); 371 372 /* If it's an end-of-archive mark, we can handle it. */ 373 if (h[0] == 0 && archive_block_is_null(h)) { 374 /* 375 * Usually, I bid the number of bits verified, but 376 * in this case, 4096 seems excessive so I picked 10 as 377 * an arbitrary but reasonable-seeming value. 378 */ 379 return (10); 380 } 381 382 /* If it's not an end-of-archive mark, it must have a valid checksum.*/ 383 if (!checksum(a, h)) 384 return (0); 385 bid += 48; /* Checksum is usually 6 octal digits. */ 386 387 header = (const struct archive_entry_header_ustar *)h; 388 389 /* Recognize POSIX formats. */ 390 if ((memcmp(header->magic, "ustar\0", 6) == 0) 391 && (memcmp(header->version, "00", 2) == 0)) 392 bid += 56; 393 394 /* Recognize GNU tar format. */ 395 if ((memcmp(header->magic, "ustar ", 6) == 0) 396 && (memcmp(header->version, " \0", 2) == 0)) 397 bid += 56; 398 399 /* Type flag must be null, digit or A-Z, a-z. */ 400 if (header->typeflag[0] != 0 && 401 !( header->typeflag[0] >= '0' && header->typeflag[0] <= '9') && 402 !( header->typeflag[0] >= 'A' && header->typeflag[0] <= 'Z') && 403 !( header->typeflag[0] >= 'a' && header->typeflag[0] <= 'z') ) 404 return (0); 405 bid += 2; /* 6 bits of variation in an 8-bit field leaves 2 bits. */ 406 407 /* 408 * Check format of mode/uid/gid/mtime/size/rdevmajor/rdevminor fields. 409 */ 410 if (bid > 0 && ( 411 validate_number_field(header->mode, sizeof(header->mode)) == 0 412 || validate_number_field(header->uid, sizeof(header->uid)) == 0 413 || validate_number_field(header->gid, sizeof(header->gid)) == 0 414 || validate_number_field(header->mtime, sizeof(header->mtime)) == 0 415 || validate_number_field(header->size, sizeof(header->size)) == 0 416 || validate_number_field(header->rdevmajor, sizeof(header->rdevmajor)) == 0 417 || validate_number_field(header->rdevminor, sizeof(header->rdevminor)) == 0)) { 418 bid = 0; 419 } 420 421 return (bid); 422 } 423 424 static int 425 archive_read_format_tar_options(struct archive_read *a, 426 const char *key, const char *val) 427 { 428 struct tar *tar; 429 int ret = ARCHIVE_FAILED; 430 431 tar = (struct tar *)(a->format->data); 432 if (strcmp(key, "compat-2x") == 0) { 433 /* Handle UTF-8 filenames as libarchive 2.x */ 434 tar->compat_2x = (val != NULL && val[0] != 0); 435 tar->init_default_conversion = tar->compat_2x; 436 return (ARCHIVE_OK); 437 } else if (strcmp(key, "hdrcharset") == 0) { 438 if (val == NULL || val[0] == 0) 439 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 440 "tar: hdrcharset option needs a character-set name"); 441 else { 442 tar->opt_sconv = 443 archive_string_conversion_from_charset( 444 &a->archive, val, 0); 445 if (tar->opt_sconv != NULL) 446 ret = ARCHIVE_OK; 447 else 448 ret = ARCHIVE_FATAL; 449 } 450 return (ret); 451 } else if (strcmp(key, "mac-ext") == 0) { 452 tar->process_mac_extensions = (val != NULL && val[0] != 0); 453 return (ARCHIVE_OK); 454 } else if (strcmp(key, "read_concatenated_archives") == 0) { 455 tar->read_concatenated_archives = (val != NULL && val[0] != 0); 456 return (ARCHIVE_OK); 457 } 458 459 /* Note: The "warn" return is just to inform the options 460 * supervisor that we didn't handle it. It will generate 461 * a suitable error if no one used this option. */ 462 return (ARCHIVE_WARN); 463 } 464 465 /* utility function- this exists to centralize the logic of tracking 466 * how much unconsumed data we have floating around, and to consume 467 * anything outstanding since we're going to do read_aheads 468 */ 469 static void 470 tar_flush_unconsumed(struct archive_read *a, size_t *unconsumed) 471 { 472 if (*unconsumed) { 473 /* 474 void *data = (void *)__archive_read_ahead(a, *unconsumed, NULL); 475 * this block of code is to poison claimed unconsumed space, ensuring 476 * things break if it is in use still. 477 * currently it WILL break things, so enable it only for debugging this issue 478 if (data) { 479 memset(data, 0xff, *unconsumed); 480 } 481 */ 482 __archive_read_consume(a, *unconsumed); 483 *unconsumed = 0; 484 } 485 } 486 487 /* 488 * The function invoked by archive_read_next_header(). This 489 * just sets up a few things and then calls the internal 490 * tar_read_header() function below. 491 */ 492 static int 493 archive_read_format_tar_read_header(struct archive_read *a, 494 struct archive_entry *entry) 495 { 496 /* 497 * When converting tar archives to cpio archives, it is 498 * essential that each distinct file have a distinct inode 499 * number. To simplify this, we keep a static count here to 500 * assign fake dev/inode numbers to each tar entry. Note that 501 * pax format archives may overwrite this with something more 502 * useful. 503 * 504 * Ideally, we would track every file read from the archive so 505 * that we could assign the same dev/ino pair to hardlinks, 506 * but the memory required to store a complete lookup table is 507 * probably not worthwhile just to support the relatively 508 * obscure tar->cpio conversion case. 509 */ 510 static int default_inode; 511 static int default_dev; 512 struct tar *tar; 513 const char *p; 514 const wchar_t *wp; 515 int r; 516 size_t l, unconsumed = 0; 517 518 /* Assign default device/inode values. */ 519 archive_entry_set_dev(entry, 1 + default_dev); /* Don't use zero. */ 520 archive_entry_set_ino(entry, ++default_inode); /* Don't use zero. */ 521 /* Limit generated st_ino number to 16 bits. */ 522 if (default_inode >= 0xffff) { 523 ++default_dev; 524 default_inode = 0; 525 } 526 527 tar = (struct tar *)(a->format->data); 528 tar->entry_offset = 0; 529 gnu_clear_sparse_list(tar); 530 tar->realsize = -1; /* Mark this as "unset" */ 531 tar->realsize_override = 0; 532 533 /* Setup default string conversion. */ 534 tar->sconv = tar->opt_sconv; 535 if (tar->sconv == NULL) { 536 if (!tar->init_default_conversion) { 537 tar->sconv_default = 538 archive_string_default_conversion_for_read(&(a->archive)); 539 tar->init_default_conversion = 1; 540 } 541 tar->sconv = tar->sconv_default; 542 } 543 544 r = tar_read_header(a, tar, entry, &unconsumed); 545 546 tar_flush_unconsumed(a, &unconsumed); 547 548 /* 549 * "non-sparse" files are really just sparse files with 550 * a single block. 551 */ 552 if (tar->sparse_list == NULL) { 553 if (gnu_add_sparse_entry(a, tar, 0, tar->entry_bytes_remaining) 554 != ARCHIVE_OK) 555 return (ARCHIVE_FATAL); 556 } else { 557 struct sparse_block *sb; 558 559 for (sb = tar->sparse_list; sb != NULL; sb = sb->next) { 560 if (!sb->hole) 561 archive_entry_sparse_add_entry(entry, 562 sb->offset, sb->remaining); 563 } 564 } 565 566 if (r == ARCHIVE_OK && archive_entry_filetype(entry) == AE_IFREG) { 567 /* 568 * "Regular" entry with trailing '/' is really 569 * directory: This is needed for certain old tar 570 * variants and even for some broken newer ones. 571 */ 572 if ((wp = archive_entry_pathname_w(entry)) != NULL) { 573 l = wcslen(wp); 574 if (l > 0 && wp[l - 1] == L'/') { 575 archive_entry_set_filetype(entry, AE_IFDIR); 576 } 577 } else if ((p = archive_entry_pathname(entry)) != NULL) { 578 l = strlen(p); 579 if (l > 0 && p[l - 1] == '/') { 580 archive_entry_set_filetype(entry, AE_IFDIR); 581 } 582 } 583 } 584 return (r); 585 } 586 587 static int 588 archive_read_format_tar_read_data(struct archive_read *a, 589 const void **buff, size_t *size, int64_t *offset) 590 { 591 ssize_t bytes_read; 592 struct tar *tar; 593 struct sparse_block *p; 594 595 tar = (struct tar *)(a->format->data); 596 597 for (;;) { 598 /* Remove exhausted entries from sparse list. */ 599 while (tar->sparse_list != NULL && 600 tar->sparse_list->remaining == 0) { 601 p = tar->sparse_list; 602 tar->sparse_list = p->next; 603 free(p); 604 } 605 606 if (tar->entry_bytes_unconsumed) { 607 __archive_read_consume(a, tar->entry_bytes_unconsumed); 608 tar->entry_bytes_unconsumed = 0; 609 } 610 611 /* If we're at end of file, return EOF. */ 612 if (tar->sparse_list == NULL || 613 tar->entry_bytes_remaining == 0) { 614 if (__archive_read_consume(a, tar->entry_padding) < 0) 615 return (ARCHIVE_FATAL); 616 tar->entry_padding = 0; 617 *buff = NULL; 618 *size = 0; 619 *offset = tar->realsize; 620 return (ARCHIVE_EOF); 621 } 622 623 *buff = __archive_read_ahead(a, 1, &bytes_read); 624 if (bytes_read < 0) 625 return (ARCHIVE_FATAL); 626 if (*buff == NULL) { 627 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 628 "Truncated tar archive"); 629 return (ARCHIVE_FATAL); 630 } 631 if (bytes_read > tar->entry_bytes_remaining) 632 bytes_read = (ssize_t)tar->entry_bytes_remaining; 633 /* Don't read more than is available in the 634 * current sparse block. */ 635 if (tar->sparse_list->remaining < bytes_read) 636 bytes_read = (ssize_t)tar->sparse_list->remaining; 637 *size = bytes_read; 638 *offset = tar->sparse_list->offset; 639 tar->sparse_list->remaining -= bytes_read; 640 tar->sparse_list->offset += bytes_read; 641 tar->entry_bytes_remaining -= bytes_read; 642 tar->entry_bytes_unconsumed = bytes_read; 643 644 if (!tar->sparse_list->hole) 645 return (ARCHIVE_OK); 646 /* Current is hole data and skip this. */ 647 } 648 } 649 650 static int 651 archive_read_format_tar_skip(struct archive_read *a) 652 { 653 int64_t bytes_skipped; 654 int64_t request; 655 struct sparse_block *p; 656 struct tar* tar; 657 658 tar = (struct tar *)(a->format->data); 659 660 /* Do not consume the hole of a sparse file. */ 661 request = 0; 662 for (p = tar->sparse_list; p != NULL; p = p->next) { 663 if (!p->hole) { 664 if (p->remaining >= INT64_MAX - request) { 665 return ARCHIVE_FATAL; 666 } 667 request += p->remaining; 668 } 669 } 670 if (request > tar->entry_bytes_remaining) 671 request = tar->entry_bytes_remaining; 672 request += tar->entry_padding + tar->entry_bytes_unconsumed; 673 674 bytes_skipped = __archive_read_consume(a, request); 675 if (bytes_skipped < 0) 676 return (ARCHIVE_FATAL); 677 678 tar->entry_bytes_remaining = 0; 679 tar->entry_bytes_unconsumed = 0; 680 tar->entry_padding = 0; 681 682 /* Free the sparse list. */ 683 gnu_clear_sparse_list(tar); 684 685 return (ARCHIVE_OK); 686 } 687 688 /* 689 * This function recursively interprets all of the headers associated 690 * with a single entry. 691 */ 692 static int 693 tar_read_header(struct archive_read *a, struct tar *tar, 694 struct archive_entry *entry, size_t *unconsumed) 695 { 696 ssize_t bytes; 697 int err, 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 */ 886 static int 887 checksum(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 */ 941 static int 942 archive_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 */ 955 static int 956 header_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 */ 1056 static int 1057 header_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 1073 static int 1074 set_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 */ 1091 static int 1092 header_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 */ 1114 static int 1115 header_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 */ 1127 static int 1128 read_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 */ 1176 static int 1177 header_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 */ 1365 static int 1366 header_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 */ 1394 static int 1395 read_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 */ 1464 static int 1465 header_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 1477 static int 1478 header_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 */ 1513 static int 1514 header_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 */ 1581 static int 1582 pax_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 1752 static int 1753 pax_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 1785 static int 1786 pax_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 1799 static int 1800 pax_attribute_rht_security_selinux(struct archive_entry *entry, 1801 const char *value, size_t value_length) 1802 { 1803 archive_entry_xattr_add_entry(entry, "security.selinux", 1804 value, value_length); 1805 1806 return 0; 1807 } 1808 1809 static int 1810 pax_attribute_acl(struct archive_read *a, struct tar *tar, 1811 struct archive_entry *entry, const char *value, int type) 1812 { 1813 int r; 1814 const char* errstr; 1815 1816 switch (type) { 1817 case ARCHIVE_ENTRY_ACL_TYPE_ACCESS: 1818 errstr = "SCHILY.acl.access"; 1819 break; 1820 case ARCHIVE_ENTRY_ACL_TYPE_DEFAULT: 1821 errstr = "SCHILY.acl.default"; 1822 break; 1823 case ARCHIVE_ENTRY_ACL_TYPE_NFS4: 1824 errstr = "SCHILY.acl.ace"; 1825 break; 1826 default: 1827 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 1828 "Unknown ACL type: %d", type); 1829 return(ARCHIVE_FATAL); 1830 } 1831 1832 if (tar->sconv_acl == NULL) { 1833 tar->sconv_acl = 1834 archive_string_conversion_from_charset( 1835 &(a->archive), "UTF-8", 1); 1836 if (tar->sconv_acl == NULL) 1837 return (ARCHIVE_FATAL); 1838 } 1839 1840 r = archive_acl_from_text_l(archive_entry_acl(entry), value, type, 1841 tar->sconv_acl); 1842 if (r != ARCHIVE_OK) { 1843 if (r == ARCHIVE_FATAL) { 1844 archive_set_error(&a->archive, ENOMEM, 1845 "%s %s", "Can't allocate memory for ", 1846 errstr); 1847 return (r); 1848 } 1849 archive_set_error(&a->archive, 1850 ARCHIVE_ERRNO_MISC, "%s %s", "Parse error: ", errstr); 1851 } 1852 return (r); 1853 } 1854 1855 /* 1856 * Parse a single key=value attribute. key/value pointers are 1857 * assumed to point into reasonably long-lived storage. 1858 * 1859 * Note that POSIX reserves all-lowercase keywords. Vendor-specific 1860 * extensions should always have keywords of the form "VENDOR.attribute" 1861 * In particular, it's quite feasible to support many different 1862 * vendor extensions here. I'm using "LIBARCHIVE" for extensions 1863 * unique to this library. 1864 * 1865 * Investigate other vendor-specific extensions and see if 1866 * any of them look useful. 1867 */ 1868 static int 1869 pax_attribute(struct archive_read *a, struct tar *tar, 1870 struct archive_entry *entry, const char *key, const char *value, size_t value_length) 1871 { 1872 int64_t s; 1873 long n; 1874 int err = ARCHIVE_OK, r; 1875 1876 if (value == NULL) 1877 value = ""; /* Disable compiler warning; do not pass 1878 * NULL pointer to strlen(). */ 1879 switch (key[0]) { 1880 case 'G': 1881 /* Reject GNU.sparse.* headers on non-regular files. */ 1882 if (strncmp(key, "GNU.sparse", 10) == 0 && 1883 !tar->sparse_allowed) { 1884 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 1885 "Non-regular file cannot be sparse"); 1886 return (ARCHIVE_FATAL); 1887 } 1888 1889 /* GNU "0.0" sparse pax format. */ 1890 if (strcmp(key, "GNU.sparse.numblocks") == 0) { 1891 tar->sparse_offset = -1; 1892 tar->sparse_numbytes = -1; 1893 tar->sparse_gnu_major = 0; 1894 tar->sparse_gnu_minor = 0; 1895 } 1896 if (strcmp(key, "GNU.sparse.offset") == 0) { 1897 tar->sparse_offset = tar_atol10(value, strlen(value)); 1898 if (tar->sparse_numbytes != -1) { 1899 if (gnu_add_sparse_entry(a, tar, 1900 tar->sparse_offset, tar->sparse_numbytes) 1901 != ARCHIVE_OK) 1902 return (ARCHIVE_FATAL); 1903 tar->sparse_offset = -1; 1904 tar->sparse_numbytes = -1; 1905 } 1906 } 1907 if (strcmp(key, "GNU.sparse.numbytes") == 0) { 1908 tar->sparse_numbytes = tar_atol10(value, strlen(value)); 1909 if (tar->sparse_numbytes != -1) { 1910 if (gnu_add_sparse_entry(a, tar, 1911 tar->sparse_offset, tar->sparse_numbytes) 1912 != ARCHIVE_OK) 1913 return (ARCHIVE_FATAL); 1914 tar->sparse_offset = -1; 1915 tar->sparse_numbytes = -1; 1916 } 1917 } 1918 if (strcmp(key, "GNU.sparse.size") == 0) { 1919 tar->realsize = tar_atol10(value, strlen(value)); 1920 archive_entry_set_size(entry, tar->realsize); 1921 tar->realsize_override = 1; 1922 } 1923 1924 /* GNU "0.1" sparse pax format. */ 1925 if (strcmp(key, "GNU.sparse.map") == 0) { 1926 tar->sparse_gnu_major = 0; 1927 tar->sparse_gnu_minor = 1; 1928 if (gnu_sparse_01_parse(a, tar, value) != ARCHIVE_OK) 1929 return (ARCHIVE_WARN); 1930 } 1931 1932 /* GNU "1.0" sparse pax format */ 1933 if (strcmp(key, "GNU.sparse.major") == 0) { 1934 tar->sparse_gnu_major = (int)tar_atol10(value, strlen(value)); 1935 tar->sparse_gnu_pending = 1; 1936 } 1937 if (strcmp(key, "GNU.sparse.minor") == 0) { 1938 tar->sparse_gnu_minor = (int)tar_atol10(value, strlen(value)); 1939 tar->sparse_gnu_pending = 1; 1940 } 1941 if (strcmp(key, "GNU.sparse.name") == 0) { 1942 /* 1943 * The real filename; when storing sparse 1944 * files, GNU tar puts a synthesized name into 1945 * the regular 'path' attribute in an attempt 1946 * to limit confusion. ;-) 1947 */ 1948 archive_strcpy(&(tar->entry_pathname_override), value); 1949 } 1950 if (strcmp(key, "GNU.sparse.realsize") == 0) { 1951 tar->realsize = tar_atol10(value, strlen(value)); 1952 archive_entry_set_size(entry, tar->realsize); 1953 tar->realsize_override = 1; 1954 } 1955 break; 1956 case 'L': 1957 /* Our extensions */ 1958 /* TODO: Handle arbitrary extended attributes... */ 1959 /* 1960 if (strcmp(key, "LIBARCHIVE.xxxxxxx") == 0) 1961 archive_entry_set_xxxxxx(entry, value); 1962 */ 1963 if (strcmp(key, "LIBARCHIVE.creationtime") == 0) { 1964 pax_time(value, &s, &n); 1965 archive_entry_set_birthtime(entry, s, n); 1966 } 1967 if (strcmp(key, "LIBARCHIVE.symlinktype") == 0) { 1968 if (strcmp(value, "file") == 0) { 1969 archive_entry_set_symlink_type(entry, 1970 AE_SYMLINK_TYPE_FILE); 1971 } else if (strcmp(value, "dir") == 0) { 1972 archive_entry_set_symlink_type(entry, 1973 AE_SYMLINK_TYPE_DIRECTORY); 1974 } 1975 } 1976 if (memcmp(key, "LIBARCHIVE.xattr.", 17) == 0) 1977 pax_attribute_xattr(entry, key, value); 1978 break; 1979 case 'R': 1980 /* GNU tar uses RHT.security header to store SELinux xattrs 1981 * SCHILY.xattr.security.selinux == RHT.security.selinux */ 1982 if (strcmp(key, "RHT.security.selinux") == 0) { 1983 pax_attribute_rht_security_selinux(entry, value, 1984 value_length); 1985 } 1986 break; 1987 case 'S': 1988 /* We support some keys used by the "star" archiver */ 1989 if (strcmp(key, "SCHILY.acl.access") == 0) { 1990 r = pax_attribute_acl(a, tar, entry, value, 1991 ARCHIVE_ENTRY_ACL_TYPE_ACCESS); 1992 if (r == ARCHIVE_FATAL) 1993 return (r); 1994 } else if (strcmp(key, "SCHILY.acl.default") == 0) { 1995 r = pax_attribute_acl(a, tar, entry, value, 1996 ARCHIVE_ENTRY_ACL_TYPE_DEFAULT); 1997 if (r == ARCHIVE_FATAL) 1998 return (r); 1999 } else if (strcmp(key, "SCHILY.acl.ace") == 0) { 2000 r = pax_attribute_acl(a, tar, entry, value, 2001 ARCHIVE_ENTRY_ACL_TYPE_NFS4); 2002 if (r == ARCHIVE_FATAL) 2003 return (r); 2004 } else if (strcmp(key, "SCHILY.devmajor") == 0) { 2005 archive_entry_set_rdevmajor(entry, 2006 (dev_t)tar_atol10(value, strlen(value))); 2007 } else if (strcmp(key, "SCHILY.devminor") == 0) { 2008 archive_entry_set_rdevminor(entry, 2009 (dev_t)tar_atol10(value, strlen(value))); 2010 } else if (strcmp(key, "SCHILY.fflags") == 0) { 2011 archive_entry_copy_fflags_text(entry, value); 2012 } else if (strcmp(key, "SCHILY.dev") == 0) { 2013 archive_entry_set_dev(entry, 2014 (dev_t)tar_atol10(value, strlen(value))); 2015 } else if (strcmp(key, "SCHILY.ino") == 0) { 2016 archive_entry_set_ino(entry, 2017 tar_atol10(value, strlen(value))); 2018 } else if (strcmp(key, "SCHILY.nlink") == 0) { 2019 archive_entry_set_nlink(entry, (unsigned) 2020 tar_atol10(value, strlen(value))); 2021 } else if (strcmp(key, "SCHILY.realsize") == 0) { 2022 tar->realsize = tar_atol10(value, strlen(value)); 2023 tar->realsize_override = 1; 2024 archive_entry_set_size(entry, tar->realsize); 2025 } else if (strncmp(key, "SCHILY.xattr.", 13) == 0) { 2026 pax_attribute_schily_xattr(entry, key, value, 2027 value_length); 2028 } else if (strcmp(key, "SUN.holesdata") == 0) { 2029 /* A Solaris extension for sparse. */ 2030 r = solaris_sparse_parse(a, tar, entry, value); 2031 if (r < err) { 2032 if (r == ARCHIVE_FATAL) 2033 return (r); 2034 err = r; 2035 archive_set_error(&a->archive, 2036 ARCHIVE_ERRNO_MISC, 2037 "Parse error: SUN.holesdata"); 2038 } 2039 } 2040 break; 2041 case 'a': 2042 if (strcmp(key, "atime") == 0) { 2043 pax_time(value, &s, &n); 2044 archive_entry_set_atime(entry, s, n); 2045 } 2046 break; 2047 case 'c': 2048 if (strcmp(key, "ctime") == 0) { 2049 pax_time(value, &s, &n); 2050 archive_entry_set_ctime(entry, s, n); 2051 } else if (strcmp(key, "charset") == 0) { 2052 /* TODO: Publish charset information in entry. */ 2053 } else if (strcmp(key, "comment") == 0) { 2054 /* TODO: Publish comment in entry. */ 2055 } 2056 break; 2057 case 'g': 2058 if (strcmp(key, "gid") == 0) { 2059 archive_entry_set_gid(entry, 2060 tar_atol10(value, strlen(value))); 2061 } else if (strcmp(key, "gname") == 0) { 2062 archive_strcpy(&(tar->entry_gname), value); 2063 } 2064 break; 2065 case 'h': 2066 if (strcmp(key, "hdrcharset") == 0) { 2067 if (strcmp(value, "BINARY") == 0) 2068 /* Binary mode. */ 2069 tar->pax_hdrcharset_binary = 1; 2070 else if (strcmp(value, "ISO-IR 10646 2000 UTF-8") == 0) 2071 tar->pax_hdrcharset_binary = 0; 2072 } 2073 break; 2074 case 'l': 2075 /* pax interchange doesn't distinguish hardlink vs. symlink. */ 2076 if (strcmp(key, "linkpath") == 0) { 2077 archive_strcpy(&(tar->entry_linkpath), value); 2078 } 2079 break; 2080 case 'm': 2081 if (strcmp(key, "mtime") == 0) { 2082 pax_time(value, &s, &n); 2083 archive_entry_set_mtime(entry, s, n); 2084 } 2085 break; 2086 case 'p': 2087 if (strcmp(key, "path") == 0) { 2088 archive_strcpy(&(tar->entry_pathname), value); 2089 } 2090 break; 2091 case 'r': 2092 /* POSIX has reserved 'realtime.*' */ 2093 break; 2094 case 's': 2095 /* POSIX has reserved 'security.*' */ 2096 /* Someday: if (strcmp(key, "security.acl") == 0) { ... } */ 2097 if (strcmp(key, "size") == 0) { 2098 /* "size" is the size of the data in the entry. */ 2099 tar->entry_bytes_remaining 2100 = tar_atol10(value, strlen(value)); 2101 /* 2102 * The "size" pax header keyword always overrides the 2103 * "size" field in the tar header. 2104 * GNU.sparse.realsize, GNU.sparse.size and 2105 * SCHILY.realsize override this value. 2106 */ 2107 if (!tar->realsize_override) { 2108 archive_entry_set_size(entry, 2109 tar->entry_bytes_remaining); 2110 tar->realsize 2111 = tar->entry_bytes_remaining; 2112 } 2113 } 2114 break; 2115 case 'u': 2116 if (strcmp(key, "uid") == 0) { 2117 archive_entry_set_uid(entry, 2118 tar_atol10(value, strlen(value))); 2119 } else if (strcmp(key, "uname") == 0) { 2120 archive_strcpy(&(tar->entry_uname), value); 2121 } 2122 break; 2123 } 2124 return (err); 2125 } 2126 2127 2128 2129 /* 2130 * parse a decimal time value, which may include a fractional portion 2131 */ 2132 static void 2133 pax_time(const char *p, int64_t *ps, long *pn) 2134 { 2135 char digit; 2136 int64_t s; 2137 unsigned long l; 2138 int sign; 2139 int64_t limit, last_digit_limit; 2140 2141 limit = INT64_MAX / 10; 2142 last_digit_limit = INT64_MAX % 10; 2143 2144 s = 0; 2145 sign = 1; 2146 if (*p == '-') { 2147 sign = -1; 2148 p++; 2149 } 2150 while (*p >= '0' && *p <= '9') { 2151 digit = *p - '0'; 2152 if (s > limit || 2153 (s == limit && digit > last_digit_limit)) { 2154 s = INT64_MAX; 2155 break; 2156 } 2157 s = (s * 10) + digit; 2158 ++p; 2159 } 2160 2161 *ps = s * sign; 2162 2163 /* Calculate nanoseconds. */ 2164 *pn = 0; 2165 2166 if (*p != '.') 2167 return; 2168 2169 l = 100000000UL; 2170 do { 2171 ++p; 2172 if (*p >= '0' && *p <= '9') 2173 *pn += (*p - '0') * l; 2174 else 2175 break; 2176 } while (l /= 10); 2177 } 2178 2179 /* 2180 * Parse GNU tar header 2181 */ 2182 static int 2183 header_gnutar(struct archive_read *a, struct tar *tar, 2184 struct archive_entry *entry, const void *h, size_t *unconsumed) 2185 { 2186 const struct archive_entry_header_gnutar *header; 2187 int64_t t; 2188 int err = ARCHIVE_OK; 2189 2190 /* 2191 * GNU header is like POSIX ustar, except 'prefix' is 2192 * replaced with some other fields. This also means the 2193 * filename is stored as in old-style archives. 2194 */ 2195 2196 /* Grab fields common to all tar variants. */ 2197 err = header_common(a, tar, entry, h); 2198 if (err == ARCHIVE_FATAL) 2199 return (err); 2200 2201 /* Copy filename over (to ensure null termination). */ 2202 header = (const struct archive_entry_header_gnutar *)h; 2203 if (archive_entry_copy_pathname_l(entry, 2204 header->name, sizeof(header->name), tar->sconv) != 0) { 2205 err = set_conversion_failed_error(a, tar->sconv, "Pathname"); 2206 if (err == ARCHIVE_FATAL) 2207 return (err); 2208 } 2209 2210 /* Fields common to ustar and GNU */ 2211 /* XXX Can the following be factored out since it's common 2212 * to ustar and gnu tar? Is it okay to move it down into 2213 * header_common, perhaps? */ 2214 if (archive_entry_copy_uname_l(entry, 2215 header->uname, sizeof(header->uname), tar->sconv) != 0) { 2216 err = set_conversion_failed_error(a, tar->sconv, "Uname"); 2217 if (err == ARCHIVE_FATAL) 2218 return (err); 2219 } 2220 2221 if (archive_entry_copy_gname_l(entry, 2222 header->gname, sizeof(header->gname), tar->sconv) != 0) { 2223 err = set_conversion_failed_error(a, tar->sconv, "Gname"); 2224 if (err == ARCHIVE_FATAL) 2225 return (err); 2226 } 2227 2228 /* Parse out device numbers only for char and block specials */ 2229 if (header->typeflag[0] == '3' || header->typeflag[0] == '4') { 2230 archive_entry_set_rdevmajor(entry, (dev_t) 2231 tar_atol(header->rdevmajor, sizeof(header->rdevmajor))); 2232 archive_entry_set_rdevminor(entry, (dev_t) 2233 tar_atol(header->rdevminor, sizeof(header->rdevminor))); 2234 } else 2235 archive_entry_set_rdev(entry, 0); 2236 2237 tar->entry_padding = 0x1ff & (-tar->entry_bytes_remaining); 2238 2239 /* Grab GNU-specific fields. */ 2240 t = tar_atol(header->atime, sizeof(header->atime)); 2241 if (t > 0) 2242 archive_entry_set_atime(entry, t, 0); 2243 t = tar_atol(header->ctime, sizeof(header->ctime)); 2244 if (t > 0) 2245 archive_entry_set_ctime(entry, t, 0); 2246 2247 if (header->realsize[0] != 0) { 2248 tar->realsize 2249 = tar_atol(header->realsize, sizeof(header->realsize)); 2250 archive_entry_set_size(entry, tar->realsize); 2251 tar->realsize_override = 1; 2252 } 2253 2254 if (header->sparse[0].offset[0] != 0) { 2255 if (gnu_sparse_old_read(a, tar, header, unconsumed) 2256 != ARCHIVE_OK) 2257 return (ARCHIVE_FATAL); 2258 } else { 2259 if (header->isextended[0] != 0) { 2260 /* XXX WTF? XXX */ 2261 } 2262 } 2263 2264 return (err); 2265 } 2266 2267 static int 2268 gnu_add_sparse_entry(struct archive_read *a, struct tar *tar, 2269 int64_t offset, int64_t remaining) 2270 { 2271 struct sparse_block *p; 2272 2273 p = (struct sparse_block *)calloc(1, sizeof(*p)); 2274 if (p == NULL) { 2275 archive_set_error(&a->archive, ENOMEM, "Out of memory"); 2276 return (ARCHIVE_FATAL); 2277 } 2278 if (tar->sparse_last != NULL) 2279 tar->sparse_last->next = p; 2280 else 2281 tar->sparse_list = p; 2282 tar->sparse_last = p; 2283 if (remaining < 0 || offset < 0 || offset > INT64_MAX - remaining) { 2284 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, "Malformed sparse map data"); 2285 return (ARCHIVE_FATAL); 2286 } 2287 p->offset = offset; 2288 p->remaining = remaining; 2289 return (ARCHIVE_OK); 2290 } 2291 2292 static void 2293 gnu_clear_sparse_list(struct tar *tar) 2294 { 2295 struct sparse_block *p; 2296 2297 while (tar->sparse_list != NULL) { 2298 p = tar->sparse_list; 2299 tar->sparse_list = p->next; 2300 free(p); 2301 } 2302 tar->sparse_last = NULL; 2303 } 2304 2305 /* 2306 * GNU tar old-format sparse data. 2307 * 2308 * GNU old-format sparse data is stored in a fixed-field 2309 * format. Offset/size values are 11-byte octal fields (same 2310 * format as 'size' field in ustart header). These are 2311 * stored in the header, allocating subsequent header blocks 2312 * as needed. Extending the header in this way is a pretty 2313 * severe POSIX violation; this design has earned GNU tar a 2314 * lot of criticism. 2315 */ 2316 2317 static int 2318 gnu_sparse_old_read(struct archive_read *a, struct tar *tar, 2319 const struct archive_entry_header_gnutar *header, size_t *unconsumed) 2320 { 2321 ssize_t bytes_read; 2322 const void *data; 2323 struct extended { 2324 struct gnu_sparse sparse[21]; 2325 char isextended[1]; 2326 char padding[7]; 2327 }; 2328 const struct extended *ext; 2329 2330 if (gnu_sparse_old_parse(a, tar, header->sparse, 4) != ARCHIVE_OK) 2331 return (ARCHIVE_FATAL); 2332 if (header->isextended[0] == 0) 2333 return (ARCHIVE_OK); 2334 2335 do { 2336 tar_flush_unconsumed(a, unconsumed); 2337 data = __archive_read_ahead(a, 512, &bytes_read); 2338 if (bytes_read < 0) 2339 return (ARCHIVE_FATAL); 2340 if (bytes_read < 512) { 2341 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 2342 "Truncated tar archive " 2343 "detected while reading sparse file data"); 2344 return (ARCHIVE_FATAL); 2345 } 2346 *unconsumed = 512; 2347 ext = (const struct extended *)data; 2348 if (gnu_sparse_old_parse(a, tar, ext->sparse, 21) != ARCHIVE_OK) 2349 return (ARCHIVE_FATAL); 2350 } while (ext->isextended[0] != 0); 2351 if (tar->sparse_list != NULL) 2352 tar->entry_offset = tar->sparse_list->offset; 2353 return (ARCHIVE_OK); 2354 } 2355 2356 static int 2357 gnu_sparse_old_parse(struct archive_read *a, struct tar *tar, 2358 const struct gnu_sparse *sparse, int length) 2359 { 2360 while (length > 0 && sparse->offset[0] != 0) { 2361 if (gnu_add_sparse_entry(a, tar, 2362 tar_atol(sparse->offset, sizeof(sparse->offset)), 2363 tar_atol(sparse->numbytes, sizeof(sparse->numbytes))) 2364 != ARCHIVE_OK) 2365 return (ARCHIVE_FATAL); 2366 sparse++; 2367 length--; 2368 } 2369 return (ARCHIVE_OK); 2370 } 2371 2372 /* 2373 * GNU tar sparse format 0.0 2374 * 2375 * Beginning with GNU tar 1.15, sparse files are stored using 2376 * information in the pax extended header. The GNU tar maintainers 2377 * have gone through a number of variations in the process of working 2378 * out this scheme; fortunately, they're all numbered. 2379 * 2380 * Sparse format 0.0 uses attribute GNU.sparse.numblocks to store the 2381 * number of blocks, and GNU.sparse.offset/GNU.sparse.numbytes to 2382 * store offset/size for each block. The repeated instances of these 2383 * latter fields violate the pax specification (which frowns on 2384 * duplicate keys), so this format was quickly replaced. 2385 */ 2386 2387 /* 2388 * GNU tar sparse format 0.1 2389 * 2390 * This version replaced the offset/numbytes attributes with 2391 * a single "map" attribute that stored a list of integers. This 2392 * format had two problems: First, the "map" attribute could be very 2393 * long, which caused problems for some implementations. More 2394 * importantly, the sparse data was lost when extracted by archivers 2395 * that didn't recognize this extension. 2396 */ 2397 2398 static int 2399 gnu_sparse_01_parse(struct archive_read *a, struct tar *tar, const char *p) 2400 { 2401 const char *e; 2402 int64_t offset = -1, size = -1; 2403 2404 for (;;) { 2405 e = p; 2406 while (*e != '\0' && *e != ',') { 2407 if (*e < '0' || *e > '9') 2408 return (ARCHIVE_WARN); 2409 e++; 2410 } 2411 if (offset < 0) { 2412 offset = tar_atol10(p, e - p); 2413 if (offset < 0) 2414 return (ARCHIVE_WARN); 2415 } else { 2416 size = tar_atol10(p, e - p); 2417 if (size < 0) 2418 return (ARCHIVE_WARN); 2419 if (gnu_add_sparse_entry(a, tar, offset, size) 2420 != ARCHIVE_OK) 2421 return (ARCHIVE_FATAL); 2422 offset = -1; 2423 } 2424 if (*e == '\0') 2425 return (ARCHIVE_OK); 2426 p = e + 1; 2427 } 2428 } 2429 2430 /* 2431 * GNU tar sparse format 1.0 2432 * 2433 * The idea: The offset/size data is stored as a series of base-10 2434 * ASCII numbers prepended to the file data, so that dearchivers that 2435 * don't support this format will extract the block map along with the 2436 * data and a separate post-process can restore the sparseness. 2437 * 2438 * Unfortunately, GNU tar 1.16 had a bug that added unnecessary 2439 * padding to the body of the file when using this format. GNU tar 2440 * 1.17 corrected this bug without bumping the version number, so 2441 * it's not possible to support both variants. This code supports 2442 * the later variant at the expense of not supporting the former. 2443 * 2444 * This variant also replaced GNU.sparse.size with GNU.sparse.realsize 2445 * and introduced the GNU.sparse.major/GNU.sparse.minor attributes. 2446 */ 2447 2448 /* 2449 * Read the next line from the input, and parse it as a decimal 2450 * integer followed by '\n'. Returns positive integer value or 2451 * negative on error. 2452 */ 2453 static int64_t 2454 gnu_sparse_10_atol(struct archive_read *a, struct tar *tar, 2455 int64_t *remaining, size_t *unconsumed) 2456 { 2457 int64_t l, limit, last_digit_limit; 2458 const char *p; 2459 ssize_t bytes_read; 2460 int base, digit; 2461 2462 base = 10; 2463 limit = INT64_MAX / base; 2464 last_digit_limit = INT64_MAX % base; 2465 2466 /* 2467 * Skip any lines starting with '#'; GNU tar specs 2468 * don't require this, but they should. 2469 */ 2470 do { 2471 bytes_read = readline(a, tar, &p, 2472 (ssize_t)tar_min(*remaining, 100), unconsumed); 2473 if (bytes_read <= 0) 2474 return (ARCHIVE_FATAL); 2475 *remaining -= bytes_read; 2476 } while (p[0] == '#'); 2477 2478 l = 0; 2479 while (bytes_read > 0) { 2480 if (*p == '\n') 2481 return (l); 2482 if (*p < '0' || *p >= '0' + base) 2483 return (ARCHIVE_WARN); 2484 digit = *p - '0'; 2485 if (l > limit || (l == limit && digit > last_digit_limit)) 2486 l = INT64_MAX; /* Truncate on overflow. */ 2487 else 2488 l = (l * base) + digit; 2489 p++; 2490 bytes_read--; 2491 } 2492 /* TODO: Error message. */ 2493 return (ARCHIVE_WARN); 2494 } 2495 2496 /* 2497 * Returns length (in bytes) of the sparse data description 2498 * that was read. 2499 */ 2500 static ssize_t 2501 gnu_sparse_10_read(struct archive_read *a, struct tar *tar, size_t *unconsumed) 2502 { 2503 ssize_t bytes_read; 2504 int entries; 2505 int64_t offset, size, to_skip, remaining; 2506 2507 /* Clear out the existing sparse list. */ 2508 gnu_clear_sparse_list(tar); 2509 2510 remaining = tar->entry_bytes_remaining; 2511 2512 /* Parse entries. */ 2513 entries = (int)gnu_sparse_10_atol(a, tar, &remaining, unconsumed); 2514 if (entries < 0) 2515 return (ARCHIVE_FATAL); 2516 /* Parse the individual entries. */ 2517 while (entries-- > 0) { 2518 /* Parse offset/size */ 2519 offset = gnu_sparse_10_atol(a, tar, &remaining, unconsumed); 2520 if (offset < 0) 2521 return (ARCHIVE_FATAL); 2522 size = gnu_sparse_10_atol(a, tar, &remaining, unconsumed); 2523 if (size < 0) 2524 return (ARCHIVE_FATAL); 2525 /* Add a new sparse entry. */ 2526 if (gnu_add_sparse_entry(a, tar, offset, size) != ARCHIVE_OK) 2527 return (ARCHIVE_FATAL); 2528 } 2529 /* Skip rest of block... */ 2530 tar_flush_unconsumed(a, unconsumed); 2531 bytes_read = (ssize_t)(tar->entry_bytes_remaining - remaining); 2532 to_skip = 0x1ff & -bytes_read; 2533 /* Fail if tar->entry_bytes_remaing would get negative */ 2534 if (to_skip > remaining) 2535 return (ARCHIVE_FATAL); 2536 if (to_skip != __archive_read_consume(a, to_skip)) 2537 return (ARCHIVE_FATAL); 2538 return ((ssize_t)(bytes_read + to_skip)); 2539 } 2540 2541 /* 2542 * Solaris pax extension for a sparse file. This is recorded with the 2543 * data and hole pairs. The way recording sparse information by Solaris' 2544 * pax simply indicates where data and sparse are, so the stored contents 2545 * consist of both data and hole. 2546 */ 2547 static int 2548 solaris_sparse_parse(struct archive_read *a, struct tar *tar, 2549 struct archive_entry *entry, const char *p) 2550 { 2551 const char *e; 2552 int64_t start, end; 2553 int hole = 1; 2554 2555 (void)entry; /* UNUSED */ 2556 2557 end = 0; 2558 if (*p == ' ') 2559 p++; 2560 else 2561 return (ARCHIVE_WARN); 2562 for (;;) { 2563 e = p; 2564 while (*e != '\0' && *e != ' ') { 2565 if (*e < '0' || *e > '9') 2566 return (ARCHIVE_WARN); 2567 e++; 2568 } 2569 start = end; 2570 end = tar_atol10(p, e - p); 2571 if (end < 0) 2572 return (ARCHIVE_WARN); 2573 if (start < end) { 2574 if (gnu_add_sparse_entry(a, tar, start, 2575 end - start) != ARCHIVE_OK) 2576 return (ARCHIVE_FATAL); 2577 tar->sparse_last->hole = hole; 2578 } 2579 if (*e == '\0') 2580 return (ARCHIVE_OK); 2581 p = e + 1; 2582 hole = hole == 0; 2583 } 2584 } 2585 2586 /*- 2587 * Convert text->integer. 2588 * 2589 * Traditional tar formats (including POSIX) specify base-8 for 2590 * all of the standard numeric fields. This is a significant limitation 2591 * in practice: 2592 * = file size is limited to 8GB 2593 * = rdevmajor and rdevminor are limited to 21 bits 2594 * = uid/gid are limited to 21 bits 2595 * 2596 * There are two workarounds for this: 2597 * = pax extended headers, which use variable-length string fields 2598 * = GNU tar and STAR both allow either base-8 or base-256 in 2599 * most fields. The high bit is set to indicate base-256. 2600 * 2601 * On read, this implementation supports both extensions. 2602 */ 2603 static int64_t 2604 tar_atol(const char *p, size_t char_cnt) 2605 { 2606 /* 2607 * Technically, GNU tar considers a field to be in base-256 2608 * only if the first byte is 0xff or 0x80. 2609 */ 2610 if (*p & 0x80) 2611 return (tar_atol256(p, char_cnt)); 2612 return (tar_atol8(p, char_cnt)); 2613 } 2614 2615 /* 2616 * Note that this implementation does not (and should not!) obey 2617 * locale settings; you cannot simply substitute strtol here, since 2618 * it does obey locale. 2619 */ 2620 static int64_t 2621 tar_atol_base_n(const char *p, size_t char_cnt, int base) 2622 { 2623 int64_t l, maxval, limit, last_digit_limit; 2624 int digit, sign; 2625 2626 maxval = INT64_MAX; 2627 limit = INT64_MAX / base; 2628 last_digit_limit = INT64_MAX % base; 2629 2630 /* the pointer will not be dereferenced if char_cnt is zero 2631 * due to the way the && operator is evaluated. 2632 */ 2633 while (char_cnt != 0 && (*p == ' ' || *p == '\t')) { 2634 p++; 2635 char_cnt--; 2636 } 2637 2638 sign = 1; 2639 if (char_cnt != 0 && *p == '-') { 2640 sign = -1; 2641 p++; 2642 char_cnt--; 2643 2644 maxval = INT64_MIN; 2645 limit = -(INT64_MIN / base); 2646 last_digit_limit = INT64_MIN % base; 2647 } 2648 2649 l = 0; 2650 if (char_cnt != 0) { 2651 digit = *p - '0'; 2652 while (digit >= 0 && digit < base && char_cnt != 0) { 2653 if (l>limit || (l == limit && digit > last_digit_limit)) { 2654 return maxval; /* Truncate on overflow. */ 2655 } 2656 l = (l * base) + digit; 2657 digit = *++p - '0'; 2658 char_cnt--; 2659 } 2660 } 2661 return (sign < 0) ? -l : l; 2662 } 2663 2664 static int64_t 2665 tar_atol8(const char *p, size_t char_cnt) 2666 { 2667 return tar_atol_base_n(p, char_cnt, 8); 2668 } 2669 2670 static int64_t 2671 tar_atol10(const char *p, size_t char_cnt) 2672 { 2673 return tar_atol_base_n(p, char_cnt, 10); 2674 } 2675 2676 /* 2677 * Parse a base-256 integer. This is just a variable-length 2678 * twos-complement signed binary value in big-endian order, except 2679 * that the high-order bit is ignored. The values here can be up to 2680 * 12 bytes, so we need to be careful about overflowing 64-bit 2681 * (8-byte) integers. 2682 * 2683 * This code unashamedly assumes that the local machine uses 8-bit 2684 * bytes and twos-complement arithmetic. 2685 */ 2686 static int64_t 2687 tar_atol256(const char *_p, size_t char_cnt) 2688 { 2689 uint64_t l; 2690 const unsigned char *p = (const unsigned char *)_p; 2691 unsigned char c, neg; 2692 2693 /* Extend 7-bit 2s-comp to 8-bit 2s-comp, decide sign. */ 2694 c = *p; 2695 if (c & 0x40) { 2696 neg = 0xff; 2697 c |= 0x80; 2698 l = ~ARCHIVE_LITERAL_ULL(0); 2699 } else { 2700 neg = 0; 2701 c &= 0x7f; 2702 l = 0; 2703 } 2704 2705 /* If more than 8 bytes, check that we can ignore 2706 * high-order bits without overflow. */ 2707 while (char_cnt > sizeof(int64_t)) { 2708 --char_cnt; 2709 if (c != neg) 2710 return neg ? INT64_MIN : INT64_MAX; 2711 c = *++p; 2712 } 2713 2714 /* c is first byte that fits; if sign mismatch, return overflow */ 2715 if ((c ^ neg) & 0x80) { 2716 return neg ? INT64_MIN : INT64_MAX; 2717 } 2718 2719 /* Accumulate remaining bytes. */ 2720 while (--char_cnt > 0) { 2721 l = (l << 8) | c; 2722 c = *++p; 2723 } 2724 l = (l << 8) | c; 2725 /* Return signed twos-complement value. */ 2726 return (int64_t)(l); 2727 } 2728 2729 /* 2730 * Returns length of line (including trailing newline) 2731 * or negative on error. 'start' argument is updated to 2732 * point to first character of line. This avoids copying 2733 * when possible. 2734 */ 2735 static ssize_t 2736 readline(struct archive_read *a, struct tar *tar, const char **start, 2737 ssize_t limit, size_t *unconsumed) 2738 { 2739 ssize_t bytes_read; 2740 ssize_t total_size = 0; 2741 const void *t; 2742 const char *s; 2743 void *p; 2744 2745 tar_flush_unconsumed(a, unconsumed); 2746 2747 t = __archive_read_ahead(a, 1, &bytes_read); 2748 if (bytes_read <= 0) 2749 return (ARCHIVE_FATAL); 2750 s = t; /* Start of line? */ 2751 p = memchr(t, '\n', bytes_read); 2752 /* If we found '\n' in the read buffer, return pointer to that. */ 2753 if (p != NULL) { 2754 bytes_read = 1 + ((const char *)p) - s; 2755 if (bytes_read > limit) { 2756 archive_set_error(&a->archive, 2757 ARCHIVE_ERRNO_FILE_FORMAT, 2758 "Line too long"); 2759 return (ARCHIVE_FATAL); 2760 } 2761 *unconsumed = bytes_read; 2762 *start = s; 2763 return (bytes_read); 2764 } 2765 *unconsumed = bytes_read; 2766 /* Otherwise, we need to accumulate in a line buffer. */ 2767 for (;;) { 2768 if (total_size + bytes_read > limit) { 2769 archive_set_error(&a->archive, 2770 ARCHIVE_ERRNO_FILE_FORMAT, 2771 "Line too long"); 2772 return (ARCHIVE_FATAL); 2773 } 2774 if (archive_string_ensure(&tar->line, total_size + bytes_read) == NULL) { 2775 archive_set_error(&a->archive, ENOMEM, 2776 "Can't allocate working buffer"); 2777 return (ARCHIVE_FATAL); 2778 } 2779 memcpy(tar->line.s + total_size, t, bytes_read); 2780 tar_flush_unconsumed(a, unconsumed); 2781 total_size += bytes_read; 2782 /* If we found '\n', clean up and return. */ 2783 if (p != NULL) { 2784 *start = tar->line.s; 2785 return (total_size); 2786 } 2787 /* Read some more. */ 2788 t = __archive_read_ahead(a, 1, &bytes_read); 2789 if (bytes_read <= 0) 2790 return (ARCHIVE_FATAL); 2791 s = t; /* Start of line? */ 2792 p = memchr(t, '\n', bytes_read); 2793 /* If we found '\n', trim the read. */ 2794 if (p != NULL) { 2795 bytes_read = 1 + ((const char *)p) - s; 2796 } 2797 *unconsumed = bytes_read; 2798 } 2799 } 2800 2801 /* 2802 * base64_decode - Base64 decode 2803 * 2804 * This accepts most variations of base-64 encoding, including: 2805 * * with or without line breaks 2806 * * with or without the final group padded with '=' or '_' characters 2807 * (The most economical Base-64 variant does not pad the last group and 2808 * omits line breaks; RFC1341 used for MIME requires both.) 2809 */ 2810 static char * 2811 base64_decode(const char *s, size_t len, size_t *out_len) 2812 { 2813 static const unsigned char digits[64] = { 2814 'A','B','C','D','E','F','G','H','I','J','K','L','M','N', 2815 'O','P','Q','R','S','T','U','V','W','X','Y','Z','a','b', 2816 'c','d','e','f','g','h','i','j','k','l','m','n','o','p', 2817 'q','r','s','t','u','v','w','x','y','z','0','1','2','3', 2818 '4','5','6','7','8','9','+','/' }; 2819 static unsigned char decode_table[128]; 2820 char *out, *d; 2821 const unsigned char *src = (const unsigned char *)s; 2822 2823 /* If the decode table is not yet initialized, prepare it. */ 2824 if (decode_table[digits[1]] != 1) { 2825 unsigned i; 2826 memset(decode_table, 0xff, sizeof(decode_table)); 2827 for (i = 0; i < sizeof(digits); i++) 2828 decode_table[digits[i]] = i; 2829 } 2830 2831 /* Allocate enough space to hold the entire output. */ 2832 /* Note that we may not use all of this... */ 2833 out = (char *)malloc(len - len / 4 + 1); 2834 if (out == NULL) { 2835 *out_len = 0; 2836 return (NULL); 2837 } 2838 d = out; 2839 2840 while (len > 0) { 2841 /* Collect the next group of (up to) four characters. */ 2842 int v = 0; 2843 int group_size = 0; 2844 while (group_size < 4 && len > 0) { 2845 /* '=' or '_' padding indicates final group. */ 2846 if (*src == '=' || *src == '_') { 2847 len = 0; 2848 break; 2849 } 2850 /* Skip illegal characters (including line breaks) */ 2851 if (*src > 127 || *src < 32 2852 || decode_table[*src] == 0xff) { 2853 len--; 2854 src++; 2855 continue; 2856 } 2857 v <<= 6; 2858 v |= decode_table[*src++]; 2859 len --; 2860 group_size++; 2861 } 2862 /* Align a short group properly. */ 2863 v <<= 6 * (4 - group_size); 2864 /* Unpack the group we just collected. */ 2865 switch (group_size) { 2866 case 4: d[2] = v & 0xff; 2867 /* FALLTHROUGH */ 2868 case 3: d[1] = (v >> 8) & 0xff; 2869 /* FALLTHROUGH */ 2870 case 2: d[0] = (v >> 16) & 0xff; 2871 break; 2872 case 1: /* this is invalid! */ 2873 break; 2874 } 2875 d += group_size * 3 / 4; 2876 } 2877 2878 *out_len = d - out; 2879 return (out); 2880 } 2881 2882 static char * 2883 url_decode(const char *in) 2884 { 2885 char *out, *d; 2886 const char *s; 2887 2888 out = (char *)malloc(strlen(in) + 1); 2889 if (out == NULL) 2890 return (NULL); 2891 for (s = in, d = out; *s != '\0'; ) { 2892 if (s[0] == '%' && s[1] != '\0' && s[2] != '\0') { 2893 /* Try to convert % escape */ 2894 int digit1 = tohex(s[1]); 2895 int digit2 = tohex(s[2]); 2896 if (digit1 >= 0 && digit2 >= 0) { 2897 /* Looks good, consume three chars */ 2898 s += 3; 2899 /* Convert output */ 2900 *d++ = ((digit1 << 4) | digit2); 2901 continue; 2902 } 2903 /* Else fall through and treat '%' as normal char */ 2904 } 2905 *d++ = *s++; 2906 } 2907 *d = '\0'; 2908 return (out); 2909 } 2910 2911 static int 2912 tohex(int c) 2913 { 2914 if (c >= '0' && c <= '9') 2915 return (c - '0'); 2916 else if (c >= 'A' && c <= 'F') 2917 return (c - 'A' + 10); 2918 else if (c >= 'a' && c <= 'f') 2919 return (c - 'a' + 10); 2920 else 2921 return (-1); 2922 } 2923