1 /*- 2 * Copyright (c) 2003-2007 Tim Kientzle 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR 15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 17 * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT, 18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26 #include "archive_platform.h" 27 __FBSDID("$FreeBSD: src/lib/libarchive/archive_read_support_format_tar.c,v 1.72 2008/12/06 06:45:15 kientzle Exp $"); 28 29 #ifdef HAVE_ERRNO_H 30 #include <errno.h> 31 #endif 32 #include <stddef.h> 33 /* #include <stdint.h> */ /* See archive_platform.h */ 34 #ifdef HAVE_STDLIB_H 35 #include <stdlib.h> 36 #endif 37 #ifdef HAVE_STRING_H 38 #include <string.h> 39 #endif 40 41 /* Obtain suitable wide-character manipulation functions. */ 42 #ifdef HAVE_WCHAR_H 43 #include <wchar.h> 44 #else 45 /* Good enough for equality testing, which is all we need. */ 46 static int wcscmp(const wchar_t *s1, const wchar_t *s2) 47 { 48 int diff = *s1 - *s2; 49 while (*s1 && diff == 0) 50 diff = (int)*++s1 - (int)*++s2; 51 return diff; 52 } 53 /* Good enough for equality testing, which is all we need. */ 54 static int wcsncmp(const wchar_t *s1, const wchar_t *s2, size_t n) 55 { 56 int diff = *s1 - *s2; 57 while (*s1 && diff == 0 && n-- > 0) 58 diff = (int)*++s1 - (int)*++s2; 59 return diff; 60 } 61 static size_t wcslen(const wchar_t *s) 62 { 63 const wchar_t *p = s; 64 while (*p) 65 p++; 66 return p - s; 67 } 68 #endif 69 70 #include "archive.h" 71 #include "archive_entry.h" 72 #include "archive_private.h" 73 #include "archive_read_private.h" 74 75 #define tar_min(a,b) ((a) < (b) ? (a) : (b)) 76 77 /* 78 * Layout of POSIX 'ustar' tar header. 79 */ 80 struct archive_entry_header_ustar { 81 char name[100]; 82 char mode[8]; 83 char uid[8]; 84 char gid[8]; 85 char size[12]; 86 char mtime[12]; 87 char checksum[8]; 88 char typeflag[1]; 89 char linkname[100]; /* "old format" header ends here */ 90 char magic[6]; /* For POSIX: "ustar\0" */ 91 char version[2]; /* For POSIX: "00" */ 92 char uname[32]; 93 char gname[32]; 94 char rdevmajor[8]; 95 char rdevminor[8]; 96 char prefix[155]; 97 }; 98 99 /* 100 * Structure of GNU tar header 101 */ 102 struct gnu_sparse { 103 char offset[12]; 104 char numbytes[12]; 105 }; 106 107 struct archive_entry_header_gnutar { 108 char name[100]; 109 char mode[8]; 110 char uid[8]; 111 char gid[8]; 112 char size[12]; 113 char mtime[12]; 114 char checksum[8]; 115 char typeflag[1]; 116 char linkname[100]; 117 char magic[8]; /* "ustar \0" (note blank/blank/null at end) */ 118 char uname[32]; 119 char gname[32]; 120 char rdevmajor[8]; 121 char rdevminor[8]; 122 char atime[12]; 123 char ctime[12]; 124 char offset[12]; 125 char longnames[4]; 126 char unused[1]; 127 struct gnu_sparse sparse[4]; 128 char isextended[1]; 129 char realsize[12]; 130 /* 131 * Old GNU format doesn't use POSIX 'prefix' field; they use 132 * the 'L' (longname) entry instead. 133 */ 134 }; 135 136 /* 137 * Data specific to this format. 138 */ 139 struct sparse_block { 140 struct sparse_block *next; 141 off_t offset; 142 off_t remaining; 143 }; 144 145 struct tar { 146 struct archive_string acl_text; 147 struct archive_string entry_pathname; 148 /* For "GNU.sparse.name" and other similar path extensions. */ 149 struct archive_string entry_pathname_override; 150 struct archive_string entry_linkpath; 151 struct archive_string entry_uname; 152 struct archive_string entry_gname; 153 struct archive_string longlink; 154 struct archive_string longname; 155 struct archive_string pax_header; 156 struct archive_string pax_global; 157 struct archive_string line; 158 int pax_hdrcharset_binary; 159 wchar_t *pax_entry; 160 size_t pax_entry_length; 161 int header_recursion_depth; 162 int64_t entry_bytes_remaining; 163 int64_t entry_offset; 164 int64_t entry_padding; 165 int64_t realsize; 166 struct sparse_block *sparse_list; 167 struct sparse_block *sparse_last; 168 int64_t sparse_offset; 169 int64_t sparse_numbytes; 170 int sparse_gnu_major; 171 int sparse_gnu_minor; 172 char sparse_gnu_pending; 173 }; 174 175 static ssize_t UTF8_mbrtowc(wchar_t *pwc, const char *s, size_t n); 176 static int archive_block_is_null(const unsigned char *p); 177 static char *base64_decode(const char *, size_t, size_t *); 178 static void gnu_add_sparse_entry(struct tar *, 179 off_t offset, off_t remaining); 180 static void gnu_clear_sparse_list(struct tar *); 181 static int gnu_sparse_old_read(struct archive_read *, struct tar *, 182 const struct archive_entry_header_gnutar *header); 183 static void gnu_sparse_old_parse(struct tar *, 184 const struct gnu_sparse *sparse, int length); 185 static int gnu_sparse_01_parse(struct tar *, const char *); 186 static ssize_t gnu_sparse_10_read(struct archive_read *, struct tar *); 187 static int header_Solaris_ACL(struct archive_read *, struct tar *, 188 struct archive_entry *, const void *); 189 static int header_common(struct archive_read *, struct tar *, 190 struct archive_entry *, const void *); 191 static int header_old_tar(struct archive_read *, struct tar *, 192 struct archive_entry *, const void *); 193 static int header_pax_extensions(struct archive_read *, struct tar *, 194 struct archive_entry *, const void *); 195 static int header_pax_global(struct archive_read *, struct tar *, 196 struct archive_entry *, const void *h); 197 static int header_longlink(struct archive_read *, struct tar *, 198 struct archive_entry *, const void *h); 199 static int header_longname(struct archive_read *, struct tar *, 200 struct archive_entry *, const void *h); 201 static int header_volume(struct archive_read *, struct tar *, 202 struct archive_entry *, const void *h); 203 static int header_ustar(struct archive_read *, struct tar *, 204 struct archive_entry *, const void *h); 205 static int header_gnutar(struct archive_read *, struct tar *, 206 struct archive_entry *, const void *h); 207 static int archive_read_format_tar_bid(struct archive_read *); 208 static int archive_read_format_tar_cleanup(struct archive_read *); 209 static int archive_read_format_tar_read_data(struct archive_read *a, 210 const void **buff, size_t *size, off_t *offset); 211 static int archive_read_format_tar_skip(struct archive_read *a); 212 static int archive_read_format_tar_read_header(struct archive_read *, 213 struct archive_entry *); 214 static int checksum(struct archive_read *, const void *); 215 static int pax_attribute(struct tar *, struct archive_entry *, 216 char *key, char *value); 217 static int pax_header(struct archive_read *, struct tar *, 218 struct archive_entry *, char *attr); 219 static void pax_time(const char *, int64_t *sec, long *nanos); 220 static ssize_t readline(struct archive_read *, struct tar *, const char **, 221 ssize_t limit); 222 static int read_body_to_string(struct archive_read *, struct tar *, 223 struct archive_string *, const void *h); 224 static int64_t tar_atol(const char *, unsigned); 225 static int64_t tar_atol10(const char *, unsigned); 226 static int64_t tar_atol256(const char *, unsigned); 227 static int64_t tar_atol8(const char *, unsigned); 228 static int tar_read_header(struct archive_read *, struct tar *, 229 struct archive_entry *); 230 static int tohex(int c); 231 static char *url_decode(const char *); 232 static wchar_t *utf8_decode(struct tar *, const char *, size_t length); 233 234 int 235 archive_read_support_format_gnutar(struct archive *a) 236 { 237 return (archive_read_support_format_tar(a)); 238 } 239 240 241 int 242 archive_read_support_format_tar(struct archive *_a) 243 { 244 struct archive_read *a = (struct archive_read *)_a; 245 struct tar *tar; 246 int r; 247 248 tar = (struct tar *)malloc(sizeof(*tar)); 249 if (tar == NULL) { 250 archive_set_error(&a->archive, ENOMEM, 251 "Can't allocate tar data"); 252 return (ARCHIVE_FATAL); 253 } 254 memset(tar, 0, sizeof(*tar)); 255 256 r = __archive_read_register_format(a, tar, "tar", 257 archive_read_format_tar_bid, 258 NULL, 259 archive_read_format_tar_read_header, 260 archive_read_format_tar_read_data, 261 archive_read_format_tar_skip, 262 archive_read_format_tar_cleanup); 263 264 if (r != ARCHIVE_OK) 265 free(tar); 266 return (ARCHIVE_OK); 267 } 268 269 static int 270 archive_read_format_tar_cleanup(struct archive_read *a) 271 { 272 struct tar *tar; 273 274 tar = (struct tar *)(a->format->data); 275 gnu_clear_sparse_list(tar); 276 archive_string_free(&tar->acl_text); 277 archive_string_free(&tar->entry_pathname); 278 archive_string_free(&tar->entry_pathname_override); 279 archive_string_free(&tar->entry_linkpath); 280 archive_string_free(&tar->entry_uname); 281 archive_string_free(&tar->entry_gname); 282 archive_string_free(&tar->line); 283 archive_string_free(&tar->pax_global); 284 archive_string_free(&tar->pax_header); 285 archive_string_free(&tar->longname); 286 archive_string_free(&tar->longlink); 287 free(tar->pax_entry); 288 free(tar); 289 (a->format->data) = NULL; 290 return (ARCHIVE_OK); 291 } 292 293 294 static int 295 archive_read_format_tar_bid(struct archive_read *a) 296 { 297 int bid; 298 const void *h; 299 const struct archive_entry_header_ustar *header; 300 301 bid = 0; 302 303 /* Now let's look at the actual header and see if it matches. */ 304 h = __archive_read_ahead(a, 512, NULL); 305 if (h == NULL) 306 return (-1); 307 308 /* If it's an end-of-archive mark, we can handle it. */ 309 if ((*(const char *)h) == 0 310 && archive_block_is_null((const unsigned char *)h)) { 311 /* 312 * Usually, I bid the number of bits verified, but 313 * in this case, 4096 seems excessive so I picked 10 as 314 * an arbitrary but reasonable-seeming value. 315 */ 316 return (10); 317 } 318 319 /* If it's not an end-of-archive mark, it must have a valid checksum.*/ 320 if (!checksum(a, h)) 321 return (0); 322 bid += 48; /* Checksum is usually 6 octal digits. */ 323 324 header = (const struct archive_entry_header_ustar *)h; 325 326 /* Recognize POSIX formats. */ 327 if ((memcmp(header->magic, "ustar\0", 6) == 0) 328 &&(memcmp(header->version, "00", 2)==0)) 329 bid += 56; 330 331 /* Recognize GNU tar format. */ 332 if ((memcmp(header->magic, "ustar ", 6) == 0) 333 &&(memcmp(header->version, " \0", 2)==0)) 334 bid += 56; 335 336 /* Type flag must be null, digit or A-Z, a-z. */ 337 if (header->typeflag[0] != 0 && 338 !( header->typeflag[0] >= '0' && header->typeflag[0] <= '9') && 339 !( header->typeflag[0] >= 'A' && header->typeflag[0] <= 'Z') && 340 !( header->typeflag[0] >= 'a' && header->typeflag[0] <= 'z') ) 341 return (0); 342 bid += 2; /* 6 bits of variation in an 8-bit field leaves 2 bits. */ 343 344 /* Sanity check: Look at first byte of mode field. */ 345 switch (255 & (unsigned)header->mode[0]) { 346 case 0: case 255: 347 /* Base-256 value: No further verification possible! */ 348 break; 349 case ' ': /* Not recommended, but not illegal, either. */ 350 break; 351 case '0': case '1': case '2': case '3': 352 case '4': case '5': case '6': case '7': 353 /* Octal Value. */ 354 /* TODO: Check format of remainder of this field. */ 355 break; 356 default: 357 /* Not a valid mode; bail out here. */ 358 return (0); 359 } 360 /* TODO: Sanity test uid/gid/size/mtime/rdevmajor/rdevminor fields. */ 361 362 return (bid); 363 } 364 365 /* 366 * The function invoked by archive_read_header(). This 367 * just sets up a few things and then calls the internal 368 * tar_read_header() function below. 369 */ 370 static int 371 archive_read_format_tar_read_header(struct archive_read *a, 372 struct archive_entry *entry) 373 { 374 /* 375 * When converting tar archives to cpio archives, it is 376 * essential that each distinct file have a distinct inode 377 * number. To simplify this, we keep a static count here to 378 * assign fake dev/inode numbers to each tar entry. Note that 379 * pax format archives may overwrite this with something more 380 * useful. 381 * 382 * Ideally, we would track every file read from the archive so 383 * that we could assign the same dev/ino pair to hardlinks, 384 * but the memory required to store a complete lookup table is 385 * probably not worthwhile just to support the relatively 386 * obscure tar->cpio conversion case. 387 */ 388 static int default_inode; 389 static int default_dev; 390 struct tar *tar; 391 struct sparse_block *sp; 392 const char *p; 393 int r; 394 size_t l; 395 396 /* Assign default device/inode values. */ 397 archive_entry_set_dev(entry, 1 + default_dev); /* Don't use zero. */ 398 archive_entry_set_ino(entry, ++default_inode); /* Don't use zero. */ 399 /* Limit generated st_ino number to 16 bits. */ 400 if (default_inode >= 0xffff) { 401 ++default_dev; 402 default_inode = 0; 403 } 404 405 tar = (struct tar *)(a->format->data); 406 tar->entry_offset = 0; 407 while (tar->sparse_list != NULL) { 408 sp = tar->sparse_list; 409 tar->sparse_list = sp->next; 410 free(sp); 411 } 412 tar->sparse_last = NULL; 413 tar->realsize = -1; /* Mark this as "unset" */ 414 415 r = tar_read_header(a, tar, entry); 416 417 /* 418 * "non-sparse" files are really just sparse files with 419 * a single block. 420 */ 421 if (tar->sparse_list == NULL) 422 gnu_add_sparse_entry(tar, 0, tar->entry_bytes_remaining); 423 424 if (r == ARCHIVE_OK) { 425 /* 426 * "Regular" entry with trailing '/' is really 427 * directory: This is needed for certain old tar 428 * variants and even for some broken newer ones. 429 */ 430 p = archive_entry_pathname(entry); 431 l = strlen(p); 432 if (archive_entry_filetype(entry) == AE_IFREG 433 && p[l-1] == '/') 434 archive_entry_set_filetype(entry, AE_IFDIR); 435 } 436 return (r); 437 } 438 439 static int 440 archive_read_format_tar_read_data(struct archive_read *a, 441 const void **buff, size_t *size, off_t *offset) 442 { 443 ssize_t bytes_read; 444 struct tar *tar; 445 struct sparse_block *p; 446 447 tar = (struct tar *)(a->format->data); 448 449 if (tar->sparse_gnu_pending) { 450 if (tar->sparse_gnu_major == 1 && tar->sparse_gnu_minor == 0) { 451 tar->sparse_gnu_pending = 0; 452 /* Read initial sparse map. */ 453 bytes_read = gnu_sparse_10_read(a, tar); 454 tar->entry_bytes_remaining -= bytes_read; 455 if (bytes_read < 0) 456 return (bytes_read); 457 } else { 458 *size = 0; 459 *offset = 0; 460 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 461 "Unrecognized GNU sparse file format"); 462 return (ARCHIVE_WARN); 463 } 464 tar->sparse_gnu_pending = 0; 465 } 466 467 /* Remove exhausted entries from sparse list. */ 468 while (tar->sparse_list != NULL && 469 tar->sparse_list->remaining == 0) { 470 p = tar->sparse_list; 471 tar->sparse_list = p->next; 472 free(p); 473 } 474 475 /* If we're at end of file, return EOF. */ 476 if (tar->sparse_list == NULL || tar->entry_bytes_remaining == 0) { 477 if (__archive_read_skip(a, tar->entry_padding) < 0) 478 return (ARCHIVE_FATAL); 479 tar->entry_padding = 0; 480 *buff = NULL; 481 *size = 0; 482 *offset = tar->realsize; 483 return (ARCHIVE_EOF); 484 } 485 486 *buff = __archive_read_ahead(a, 1, &bytes_read); 487 if (bytes_read < 0) 488 return (ARCHIVE_FATAL); 489 if (*buff == NULL) { 490 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 491 "Truncated tar archive"); 492 return (ARCHIVE_FATAL); 493 } 494 if (bytes_read > tar->entry_bytes_remaining) 495 bytes_read = tar->entry_bytes_remaining; 496 /* Don't read more than is available in the 497 * current sparse block. */ 498 if (tar->sparse_list->remaining < bytes_read) 499 bytes_read = tar->sparse_list->remaining; 500 *size = bytes_read; 501 *offset = tar->sparse_list->offset; 502 tar->sparse_list->remaining -= bytes_read; 503 tar->sparse_list->offset += bytes_read; 504 tar->entry_bytes_remaining -= bytes_read; 505 __archive_read_consume(a, bytes_read); 506 return (ARCHIVE_OK); 507 } 508 509 static int 510 archive_read_format_tar_skip(struct archive_read *a) 511 { 512 int64_t bytes_skipped; 513 struct tar* tar; 514 515 tar = (struct tar *)(a->format->data); 516 517 /* 518 * Compression layer skip functions are required to either skip the 519 * length requested or fail, so we can rely upon the entire entry 520 * plus padding being skipped. 521 */ 522 bytes_skipped = __archive_read_skip(a, 523 tar->entry_bytes_remaining + tar->entry_padding); 524 if (bytes_skipped < 0) 525 return (ARCHIVE_FATAL); 526 527 tar->entry_bytes_remaining = 0; 528 tar->entry_padding = 0; 529 530 /* Free the sparse list. */ 531 gnu_clear_sparse_list(tar); 532 533 return (ARCHIVE_OK); 534 } 535 536 /* 537 * This function recursively interprets all of the headers associated 538 * with a single entry. 539 */ 540 static int 541 tar_read_header(struct archive_read *a, struct tar *tar, 542 struct archive_entry *entry) 543 { 544 ssize_t bytes; 545 int err; 546 const void *h; 547 const struct archive_entry_header_ustar *header; 548 549 /* Read 512-byte header record */ 550 h = __archive_read_ahead(a, 512, &bytes); 551 if (bytes < 0) 552 return (bytes); 553 if (bytes < 512) { /* Short read or EOF. */ 554 /* Try requesting just one byte and see what happens. */ 555 h = __archive_read_ahead(a, 1, &bytes); 556 if (bytes == 0) { 557 /* 558 * The archive ends at a 512-byte boundary but 559 * without a proper end-of-archive marker. 560 * Yes, there are tar writers that do this; 561 * hold our nose and accept it. 562 */ 563 return (ARCHIVE_EOF); 564 } 565 /* Archive ends with a partial block; this is bad. */ 566 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 567 "Truncated tar archive"); 568 return (ARCHIVE_FATAL); 569 } 570 __archive_read_consume(a, 512); 571 572 573 /* Check for end-of-archive mark. */ 574 if (((*(const char *)h)==0) && archive_block_is_null((const unsigned char *)h)) { 575 /* Try to consume a second all-null record, as well. */ 576 h = __archive_read_ahead(a, 512, NULL); 577 if (h != NULL) 578 __archive_read_consume(a, 512); 579 archive_set_error(&a->archive, 0, NULL); 580 if (a->archive.archive_format_name == NULL) { 581 a->archive.archive_format = ARCHIVE_FORMAT_TAR; 582 a->archive.archive_format_name = "tar"; 583 } 584 return (ARCHIVE_EOF); 585 } 586 587 /* 588 * Note: If the checksum fails and we return ARCHIVE_RETRY, 589 * then the client is likely to just retry. This is a very 590 * crude way to search for the next valid header! 591 * 592 * TODO: Improve this by implementing a real header scan. 593 */ 594 if (!checksum(a, h)) { 595 archive_set_error(&a->archive, EINVAL, "Damaged tar archive"); 596 return (ARCHIVE_RETRY); /* Retryable: Invalid header */ 597 } 598 599 if (++tar->header_recursion_depth > 32) { 600 archive_set_error(&a->archive, EINVAL, "Too many special headers"); 601 return (ARCHIVE_WARN); 602 } 603 604 /* Determine the format variant. */ 605 header = (const struct archive_entry_header_ustar *)h; 606 switch(header->typeflag[0]) { 607 case 'A': /* Solaris tar ACL */ 608 a->archive.archive_format = ARCHIVE_FORMAT_TAR_PAX_INTERCHANGE; 609 a->archive.archive_format_name = "Solaris tar"; 610 err = header_Solaris_ACL(a, tar, entry, h); 611 break; 612 case 'g': /* POSIX-standard 'g' header. */ 613 a->archive.archive_format = ARCHIVE_FORMAT_TAR_PAX_INTERCHANGE; 614 a->archive.archive_format_name = "POSIX pax interchange format"; 615 err = header_pax_global(a, tar, entry, h); 616 break; 617 case 'K': /* Long link name (GNU tar, others) */ 618 err = header_longlink(a, tar, entry, h); 619 break; 620 case 'L': /* Long filename (GNU tar, others) */ 621 err = header_longname(a, tar, entry, h); 622 break; 623 case 'V': /* GNU volume header */ 624 err = header_volume(a, tar, entry, h); 625 break; 626 case 'X': /* Used by SUN tar; same as 'x'. */ 627 a->archive.archive_format = ARCHIVE_FORMAT_TAR_PAX_INTERCHANGE; 628 a->archive.archive_format_name = 629 "POSIX pax interchange format (Sun variant)"; 630 err = header_pax_extensions(a, tar, entry, h); 631 break; 632 case 'x': /* POSIX-standard 'x' header. */ 633 a->archive.archive_format = ARCHIVE_FORMAT_TAR_PAX_INTERCHANGE; 634 a->archive.archive_format_name = "POSIX pax interchange format"; 635 err = header_pax_extensions(a, tar, entry, h); 636 break; 637 default: 638 if (memcmp(header->magic, "ustar \0", 8) == 0) { 639 a->archive.archive_format = ARCHIVE_FORMAT_TAR_GNUTAR; 640 a->archive.archive_format_name = "GNU tar format"; 641 err = header_gnutar(a, tar, entry, h); 642 } else if (memcmp(header->magic, "ustar", 5) == 0) { 643 if (a->archive.archive_format != ARCHIVE_FORMAT_TAR_PAX_INTERCHANGE) { 644 a->archive.archive_format = ARCHIVE_FORMAT_TAR_USTAR; 645 a->archive.archive_format_name = "POSIX ustar format"; 646 } 647 err = header_ustar(a, tar, entry, h); 648 } else { 649 a->archive.archive_format = ARCHIVE_FORMAT_TAR; 650 a->archive.archive_format_name = "tar (non-POSIX)"; 651 err = header_old_tar(a, tar, entry, h); 652 } 653 } 654 --tar->header_recursion_depth; 655 /* We return warnings or success as-is. Anything else is fatal. */ 656 if (err == ARCHIVE_WARN || err == ARCHIVE_OK) 657 return (err); 658 if (err == ARCHIVE_EOF) 659 /* EOF when recursively reading a header is bad. */ 660 archive_set_error(&a->archive, EINVAL, "Damaged tar archive"); 661 return (ARCHIVE_FATAL); 662 } 663 664 /* 665 * Return true if block checksum is correct. 666 */ 667 static int 668 checksum(struct archive_read *a, const void *h) 669 { 670 const unsigned char *bytes; 671 const struct archive_entry_header_ustar *header; 672 int check, i, sum; 673 674 (void)a; /* UNUSED */ 675 bytes = (const unsigned char *)h; 676 header = (const struct archive_entry_header_ustar *)h; 677 678 /* 679 * Test the checksum. Note that POSIX specifies _unsigned_ 680 * bytes for this calculation. 681 */ 682 sum = tar_atol(header->checksum, sizeof(header->checksum)); 683 check = 0; 684 for (i = 0; i < 148; i++) 685 check += (unsigned char)bytes[i]; 686 for (; i < 156; i++) 687 check += 32; 688 for (; i < 512; i++) 689 check += (unsigned char)bytes[i]; 690 if (sum == check) 691 return (1); 692 693 /* 694 * Repeat test with _signed_ bytes, just in case this archive 695 * was created by an old BSD, Solaris, or HP-UX tar with a 696 * broken checksum calculation. 697 */ 698 check = 0; 699 for (i = 0; i < 148; i++) 700 check += (signed char)bytes[i]; 701 for (; i < 156; i++) 702 check += 32; 703 for (; i < 512; i++) 704 check += (signed char)bytes[i]; 705 if (sum == check) 706 return (1); 707 708 return (0); 709 } 710 711 /* 712 * Return true if this block contains only nulls. 713 */ 714 static int 715 archive_block_is_null(const unsigned char *p) 716 { 717 unsigned i; 718 719 for (i = 0; i < 512; i++) 720 if (*p++) 721 return (0); 722 return (1); 723 } 724 725 /* 726 * Interpret 'A' Solaris ACL header 727 */ 728 static int 729 header_Solaris_ACL(struct archive_read *a, struct tar *tar, 730 struct archive_entry *entry, const void *h) 731 { 732 const struct archive_entry_header_ustar *header; 733 size_t size; 734 int err; 735 char *acl, *p; 736 wchar_t *wp; 737 738 /* 739 * read_body_to_string adds a NUL terminator, but we need a little 740 * more to make sure that we don't overrun acl_text later. 741 */ 742 header = (const struct archive_entry_header_ustar *)h; 743 size = tar_atol(header->size, sizeof(header->size)); 744 err = read_body_to_string(a, tar, &(tar->acl_text), h); 745 if (err != ARCHIVE_OK) 746 return (err); 747 err = tar_read_header(a, tar, entry); 748 if ((err != ARCHIVE_OK) && (err != ARCHIVE_WARN)) 749 return (err); 750 751 /* Skip leading octal number. */ 752 /* XXX TODO: Parse the octal number and sanity-check it. */ 753 p = acl = tar->acl_text.s; 754 while (*p != '\0' && p < acl + size) 755 p++; 756 p++; 757 758 if (p >= acl + size) { 759 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 760 "Malformed Solaris ACL attribute"); 761 return(ARCHIVE_WARN); 762 } 763 764 /* Skip leading octal number. */ 765 size -= (p - acl); 766 acl = p; 767 768 while (*p != '\0' && p < acl + size) 769 p++; 770 771 wp = utf8_decode(tar, acl, p - acl); 772 err = __archive_entry_acl_parse_w(entry, wp, 773 ARCHIVE_ENTRY_ACL_TYPE_ACCESS); 774 return (err); 775 } 776 777 /* 778 * Interpret 'K' long linkname header. 779 */ 780 static int 781 header_longlink(struct archive_read *a, struct tar *tar, 782 struct archive_entry *entry, const void *h) 783 { 784 int err; 785 786 err = read_body_to_string(a, tar, &(tar->longlink), h); 787 if (err != ARCHIVE_OK) 788 return (err); 789 err = tar_read_header(a, tar, entry); 790 if ((err != ARCHIVE_OK) && (err != ARCHIVE_WARN)) 791 return (err); 792 /* Set symlink if symlink already set, else hardlink. */ 793 archive_entry_copy_link(entry, tar->longlink.s); 794 return (ARCHIVE_OK); 795 } 796 797 /* 798 * Interpret 'L' long filename header. 799 */ 800 static int 801 header_longname(struct archive_read *a, struct tar *tar, 802 struct archive_entry *entry, const void *h) 803 { 804 int err; 805 806 err = read_body_to_string(a, tar, &(tar->longname), h); 807 if (err != ARCHIVE_OK) 808 return (err); 809 /* Read and parse "real" header, then override name. */ 810 err = tar_read_header(a, tar, entry); 811 if ((err != ARCHIVE_OK) && (err != ARCHIVE_WARN)) 812 return (err); 813 archive_entry_copy_pathname(entry, tar->longname.s); 814 return (ARCHIVE_OK); 815 } 816 817 818 /* 819 * Interpret 'V' GNU tar volume header. 820 */ 821 static int 822 header_volume(struct archive_read *a, struct tar *tar, 823 struct archive_entry *entry, const void *h) 824 { 825 (void)h; 826 827 /* Just skip this and read the next header. */ 828 return (tar_read_header(a, tar, entry)); 829 } 830 831 /* 832 * Read body of an archive entry into an archive_string object. 833 */ 834 static int 835 read_body_to_string(struct archive_read *a, struct tar *tar, 836 struct archive_string *as, const void *h) 837 { 838 off_t size, padded_size; 839 const struct archive_entry_header_ustar *header; 840 const void *src; 841 842 (void)tar; /* UNUSED */ 843 header = (const struct archive_entry_header_ustar *)h; 844 size = tar_atol(header->size, sizeof(header->size)); 845 if ((size > 1048576) || (size < 0)) { 846 archive_set_error(&a->archive, EINVAL, 847 "Special header too large"); 848 return (ARCHIVE_FATAL); 849 } 850 851 /* Fail if we can't make our buffer big enough. */ 852 if (archive_string_ensure(as, size+1) == NULL) { 853 archive_set_error(&a->archive, ENOMEM, 854 "No memory"); 855 return (ARCHIVE_FATAL); 856 } 857 858 /* Read the body into the string. */ 859 padded_size = (size + 511) & ~ 511; 860 src = __archive_read_ahead(a, padded_size, NULL); 861 if (src == NULL) 862 return (ARCHIVE_FATAL); 863 memcpy(as->s, src, size); 864 __archive_read_consume(a, padded_size); 865 as->s[size] = '\0'; 866 return (ARCHIVE_OK); 867 } 868 869 /* 870 * Parse out common header elements. 871 * 872 * This would be the same as header_old_tar, except that the 873 * filename is handled slightly differently for old and POSIX 874 * entries (POSIX entries support a 'prefix'). This factoring 875 * allows header_old_tar and header_ustar 876 * to handle filenames differently, while still putting most of the 877 * common parsing into one place. 878 */ 879 static int 880 header_common(struct archive_read *a, struct tar *tar, 881 struct archive_entry *entry, const void *h) 882 { 883 const struct archive_entry_header_ustar *header; 884 char tartype; 885 886 (void)a; /* UNUSED */ 887 888 header = (const struct archive_entry_header_ustar *)h; 889 if (header->linkname[0]) 890 archive_strncpy(&(tar->entry_linkpath), header->linkname, 891 sizeof(header->linkname)); 892 else 893 archive_string_empty(&(tar->entry_linkpath)); 894 895 /* Parse out the numeric fields (all are octal) */ 896 archive_entry_set_mode(entry, tar_atol(header->mode, sizeof(header->mode))); 897 archive_entry_set_uid(entry, tar_atol(header->uid, sizeof(header->uid))); 898 archive_entry_set_gid(entry, tar_atol(header->gid, sizeof(header->gid))); 899 tar->entry_bytes_remaining = tar_atol(header->size, sizeof(header->size)); 900 tar->realsize = tar->entry_bytes_remaining; 901 archive_entry_set_size(entry, tar->entry_bytes_remaining); 902 archive_entry_set_mtime(entry, tar_atol(header->mtime, sizeof(header->mtime)), 0); 903 904 /* Handle the tar type flag appropriately. */ 905 tartype = header->typeflag[0]; 906 907 switch (tartype) { 908 case '1': /* Hard link */ 909 archive_entry_copy_hardlink(entry, tar->entry_linkpath.s); 910 /* 911 * The following may seem odd, but: Technically, tar 912 * does not store the file type for a "hard link" 913 * entry, only the fact that it is a hard link. So, I 914 * leave the type zero normally. But, pax interchange 915 * format allows hard links to have data, which 916 * implies that the underlying entry is a regular 917 * file. 918 */ 919 if (archive_entry_size(entry) > 0) 920 archive_entry_set_filetype(entry, AE_IFREG); 921 922 /* 923 * A tricky point: Traditionally, tar readers have 924 * ignored the size field when reading hardlink 925 * entries, and some writers put non-zero sizes even 926 * though the body is empty. POSIX blessed this 927 * convention in the 1988 standard, but broke with 928 * this tradition in 2001 by permitting hardlink 929 * entries to store valid bodies in pax interchange 930 * format, but not in ustar format. Since there is no 931 * hard and fast way to distinguish pax interchange 932 * from earlier archives (the 'x' and 'g' entries are 933 * optional, after all), we need a heuristic. 934 */ 935 if (archive_entry_size(entry) == 0) { 936 /* If the size is already zero, we're done. */ 937 } else if (a->archive.archive_format 938 == ARCHIVE_FORMAT_TAR_PAX_INTERCHANGE) { 939 /* Definitely pax extended; must obey hardlink size. */ 940 } else if (a->archive.archive_format == ARCHIVE_FORMAT_TAR 941 || a->archive.archive_format == ARCHIVE_FORMAT_TAR_GNUTAR) 942 { 943 /* Old-style or GNU tar: we must ignore the size. */ 944 archive_entry_set_size(entry, 0); 945 tar->entry_bytes_remaining = 0; 946 } else if (archive_read_format_tar_bid(a) > 50) { 947 /* 948 * We don't know if it's pax: If the bid 949 * function sees a valid ustar header 950 * immediately following, then let's ignore 951 * the hardlink size. 952 */ 953 archive_entry_set_size(entry, 0); 954 tar->entry_bytes_remaining = 0; 955 } 956 /* 957 * TODO: There are still two cases I'd like to handle: 958 * = a ustar non-pax archive with a hardlink entry at 959 * end-of-archive. (Look for block of nulls following?) 960 * = a pax archive that has not seen any pax headers 961 * and has an entry which is a hardlink entry storing 962 * a body containing an uncompressed tar archive. 963 * The first is worth addressing; I don't see any reliable 964 * way to deal with the second possibility. 965 */ 966 break; 967 case '2': /* Symlink */ 968 archive_entry_set_filetype(entry, AE_IFLNK); 969 archive_entry_set_size(entry, 0); 970 tar->entry_bytes_remaining = 0; 971 archive_entry_copy_symlink(entry, tar->entry_linkpath.s); 972 break; 973 case '3': /* Character device */ 974 archive_entry_set_filetype(entry, AE_IFCHR); 975 archive_entry_set_size(entry, 0); 976 tar->entry_bytes_remaining = 0; 977 break; 978 case '4': /* Block device */ 979 archive_entry_set_filetype(entry, AE_IFBLK); 980 archive_entry_set_size(entry, 0); 981 tar->entry_bytes_remaining = 0; 982 break; 983 case '5': /* Dir */ 984 archive_entry_set_filetype(entry, AE_IFDIR); 985 archive_entry_set_size(entry, 0); 986 tar->entry_bytes_remaining = 0; 987 break; 988 case '6': /* FIFO device */ 989 archive_entry_set_filetype(entry, AE_IFIFO); 990 archive_entry_set_size(entry, 0); 991 tar->entry_bytes_remaining = 0; 992 break; 993 case 'D': /* GNU incremental directory type */ 994 /* 995 * No special handling is actually required here. 996 * It might be nice someday to preprocess the file list and 997 * provide it to the client, though. 998 */ 999 archive_entry_set_filetype(entry, AE_IFDIR); 1000 break; 1001 case 'M': /* GNU "Multi-volume" (remainder of file from last archive)*/ 1002 /* 1003 * As far as I can tell, this is just like a regular file 1004 * entry, except that the contents should be _appended_ to 1005 * the indicated file at the indicated offset. This may 1006 * require some API work to fully support. 1007 */ 1008 break; 1009 case 'N': /* Old GNU "long filename" entry. */ 1010 /* The body of this entry is a script for renaming 1011 * previously-extracted entries. Ugh. It will never 1012 * be supported by libarchive. */ 1013 archive_entry_set_filetype(entry, AE_IFREG); 1014 break; 1015 case 'S': /* GNU sparse files */ 1016 /* 1017 * Sparse files are really just regular files with 1018 * sparse information in the extended area. 1019 */ 1020 /* FALLTHROUGH */ 1021 default: /* Regular file and non-standard types */ 1022 /* 1023 * Per POSIX: non-recognized types should always be 1024 * treated as regular files. 1025 */ 1026 archive_entry_set_filetype(entry, AE_IFREG); 1027 break; 1028 } 1029 return (0); 1030 } 1031 1032 /* 1033 * Parse out header elements for "old-style" tar archives. 1034 */ 1035 static int 1036 header_old_tar(struct archive_read *a, struct tar *tar, 1037 struct archive_entry *entry, const void *h) 1038 { 1039 const struct archive_entry_header_ustar *header; 1040 1041 /* Copy filename over (to ensure null termination). */ 1042 header = (const struct archive_entry_header_ustar *)h; 1043 archive_strncpy(&(tar->entry_pathname), header->name, sizeof(header->name)); 1044 archive_entry_copy_pathname(entry, tar->entry_pathname.s); 1045 1046 /* Grab rest of common fields */ 1047 header_common(a, tar, entry, h); 1048 1049 tar->entry_padding = 0x1ff & (-tar->entry_bytes_remaining); 1050 return (0); 1051 } 1052 1053 /* 1054 * Parse a file header for a pax extended archive entry. 1055 */ 1056 static int 1057 header_pax_global(struct archive_read *a, struct tar *tar, 1058 struct archive_entry *entry, const void *h) 1059 { 1060 int err; 1061 1062 err = read_body_to_string(a, tar, &(tar->pax_global), h); 1063 if (err != ARCHIVE_OK) 1064 return (err); 1065 err = tar_read_header(a, tar, entry); 1066 return (err); 1067 } 1068 1069 static int 1070 header_pax_extensions(struct archive_read *a, struct tar *tar, 1071 struct archive_entry *entry, const void *h) 1072 { 1073 int err, err2; 1074 1075 err = read_body_to_string(a, tar, &(tar->pax_header), h); 1076 if (err != ARCHIVE_OK) 1077 return (err); 1078 1079 /* Parse the next header. */ 1080 err = tar_read_header(a, tar, entry); 1081 if ((err != ARCHIVE_OK) && (err != ARCHIVE_WARN)) 1082 return (err); 1083 1084 /* 1085 * TODO: Parse global/default options into 'entry' struct here 1086 * before handling file-specific options. 1087 * 1088 * This design (parse standard header, then overwrite with pax 1089 * extended attribute data) usually works well, but isn't ideal; 1090 * it would be better to parse the pax extended attributes first 1091 * and then skip any fields in the standard header that were 1092 * defined in the pax header. 1093 */ 1094 err2 = pax_header(a, tar, entry, tar->pax_header.s); 1095 err = err_combine(err, err2); 1096 tar->entry_padding = 0x1ff & (-tar->entry_bytes_remaining); 1097 return (err); 1098 } 1099 1100 1101 /* 1102 * Parse a file header for a Posix "ustar" archive entry. This also 1103 * handles "pax" or "extended ustar" entries. 1104 */ 1105 static int 1106 header_ustar(struct archive_read *a, struct tar *tar, 1107 struct archive_entry *entry, const void *h) 1108 { 1109 const struct archive_entry_header_ustar *header; 1110 struct archive_string *as; 1111 1112 header = (const struct archive_entry_header_ustar *)h; 1113 1114 /* Copy name into an internal buffer to ensure null-termination. */ 1115 as = &(tar->entry_pathname); 1116 if (header->prefix[0]) { 1117 archive_strncpy(as, header->prefix, sizeof(header->prefix)); 1118 if (as->s[archive_strlen(as) - 1] != '/') 1119 archive_strappend_char(as, '/'); 1120 archive_strncat(as, header->name, sizeof(header->name)); 1121 } else 1122 archive_strncpy(as, header->name, sizeof(header->name)); 1123 1124 archive_entry_copy_pathname(entry, as->s); 1125 1126 /* Handle rest of common fields. */ 1127 header_common(a, tar, entry, h); 1128 1129 /* Handle POSIX ustar fields. */ 1130 archive_strncpy(&(tar->entry_uname), header->uname, 1131 sizeof(header->uname)); 1132 archive_entry_copy_uname(entry, tar->entry_uname.s); 1133 1134 archive_strncpy(&(tar->entry_gname), header->gname, 1135 sizeof(header->gname)); 1136 archive_entry_copy_gname(entry, tar->entry_gname.s); 1137 1138 /* Parse out device numbers only for char and block specials. */ 1139 if (header->typeflag[0] == '3' || header->typeflag[0] == '4') { 1140 archive_entry_set_rdevmajor(entry, 1141 tar_atol(header->rdevmajor, sizeof(header->rdevmajor))); 1142 archive_entry_set_rdevminor(entry, 1143 tar_atol(header->rdevminor, sizeof(header->rdevminor))); 1144 } 1145 1146 tar->entry_padding = 0x1ff & (-tar->entry_bytes_remaining); 1147 1148 return (0); 1149 } 1150 1151 1152 /* 1153 * Parse the pax extended attributes record. 1154 * 1155 * Returns non-zero if there's an error in the data. 1156 */ 1157 static int 1158 pax_header(struct archive_read *a, struct tar *tar, 1159 struct archive_entry *entry, char *attr) 1160 { 1161 size_t attr_length, l, line_length; 1162 char *line, *p; 1163 char *key, *value; 1164 int err, err2; 1165 1166 attr_length = strlen(attr); 1167 tar->pax_hdrcharset_binary = 0; 1168 archive_string_empty(&(tar->entry_gname)); 1169 archive_string_empty(&(tar->entry_linkpath)); 1170 archive_string_empty(&(tar->entry_pathname)); 1171 archive_string_empty(&(tar->entry_pathname_override)); 1172 archive_string_empty(&(tar->entry_uname)); 1173 err = ARCHIVE_OK; 1174 while (attr_length > 0) { 1175 /* Parse decimal length field at start of line. */ 1176 line_length = 0; 1177 l = attr_length; 1178 line = p = attr; /* Record start of line. */ 1179 while (l>0) { 1180 if (*p == ' ') { 1181 p++; 1182 l--; 1183 break; 1184 } 1185 if (*p < '0' || *p > '9') { 1186 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 1187 "Ignoring malformed pax extended attributes"); 1188 return (ARCHIVE_WARN); 1189 } 1190 line_length *= 10; 1191 line_length += *p - '0'; 1192 if (line_length > 999999) { 1193 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 1194 "Rejecting pax extended attribute > 1MB"); 1195 return (ARCHIVE_WARN); 1196 } 1197 p++; 1198 l--; 1199 } 1200 1201 /* 1202 * Parsed length must be no bigger than available data, 1203 * at least 1, and the last character of the line must 1204 * be '\n'. 1205 */ 1206 if (line_length > attr_length 1207 || line_length < 1 1208 || attr[line_length - 1] != '\n') 1209 { 1210 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 1211 "Ignoring malformed pax extended attribute"); 1212 return (ARCHIVE_WARN); 1213 } 1214 1215 /* Null-terminate the line. */ 1216 attr[line_length - 1] = '\0'; 1217 1218 /* Find end of key and null terminate it. */ 1219 key = p; 1220 if (key[0] == '=') 1221 return (-1); 1222 while (*p && *p != '=') 1223 ++p; 1224 if (*p == '\0') { 1225 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 1226 "Invalid pax extended attributes"); 1227 return (ARCHIVE_WARN); 1228 } 1229 *p = '\0'; 1230 1231 /* Identify null-terminated 'value' portion. */ 1232 value = p + 1; 1233 1234 /* Identify this attribute and set it in the entry. */ 1235 err2 = pax_attribute(tar, entry, key, value); 1236 err = err_combine(err, err2); 1237 1238 /* Skip to next line */ 1239 attr += line_length; 1240 attr_length -= line_length; 1241 } 1242 if (archive_strlen(&(tar->entry_gname)) > 0) { 1243 value = tar->entry_gname.s; 1244 if (tar->pax_hdrcharset_binary) 1245 archive_entry_copy_gname(entry, value); 1246 else { 1247 if (!archive_entry_update_gname_utf8(entry, value)) { 1248 err = ARCHIVE_WARN; 1249 archive_set_error(&a->archive, 1250 ARCHIVE_ERRNO_FILE_FORMAT, 1251 "Gname in pax header can't " 1252 "be converted to current locale."); 1253 } 1254 } 1255 } 1256 if (archive_strlen(&(tar->entry_linkpath)) > 0) { 1257 value = tar->entry_linkpath.s; 1258 if (tar->pax_hdrcharset_binary) 1259 archive_entry_copy_link(entry, value); 1260 else { 1261 if (!archive_entry_update_link_utf8(entry, value)) { 1262 err = ARCHIVE_WARN; 1263 archive_set_error(&a->archive, 1264 ARCHIVE_ERRNO_FILE_FORMAT, 1265 "Linkname in pax header can't " 1266 "be converted to current locale."); 1267 } 1268 } 1269 } 1270 /* 1271 * Some extensions (such as the GNU sparse file extensions) 1272 * deliberately store a synthetic name under the regular 'path' 1273 * attribute and the real file name under a different attribute. 1274 * Since we're supposed to not care about the order, we 1275 * have no choice but to store all of the various filenames 1276 * we find and figure it all out afterwards. This is the 1277 * figuring out part. 1278 */ 1279 value = NULL; 1280 if (archive_strlen(&(tar->entry_pathname_override)) > 0) 1281 value = tar->entry_pathname_override.s; 1282 else if (archive_strlen(&(tar->entry_pathname)) > 0) 1283 value = tar->entry_pathname.s; 1284 if (value != NULL) { 1285 if (tar->pax_hdrcharset_binary) 1286 archive_entry_copy_pathname(entry, value); 1287 else { 1288 if (!archive_entry_update_pathname_utf8(entry, value)) { 1289 err = ARCHIVE_WARN; 1290 archive_set_error(&a->archive, 1291 ARCHIVE_ERRNO_FILE_FORMAT, 1292 "Pathname in pax header can't be " 1293 "converted to current locale."); 1294 } 1295 } 1296 } 1297 if (archive_strlen(&(tar->entry_uname)) > 0) { 1298 value = tar->entry_uname.s; 1299 if (tar->pax_hdrcharset_binary) 1300 archive_entry_copy_uname(entry, value); 1301 else { 1302 if (!archive_entry_update_uname_utf8(entry, value)) { 1303 err = ARCHIVE_WARN; 1304 archive_set_error(&a->archive, 1305 ARCHIVE_ERRNO_FILE_FORMAT, 1306 "Uname in pax header can't " 1307 "be converted to current locale."); 1308 } 1309 } 1310 } 1311 return (err); 1312 } 1313 1314 static int 1315 pax_attribute_xattr(struct archive_entry *entry, 1316 char *name, char *value) 1317 { 1318 char *name_decoded; 1319 void *value_decoded; 1320 size_t value_len; 1321 1322 if (strlen(name) < 18 || (strncmp(name, "LIBARCHIVE.xattr.", 17)) != 0) 1323 return 3; 1324 1325 name += 17; 1326 1327 /* URL-decode name */ 1328 name_decoded = url_decode(name); 1329 if (name_decoded == NULL) 1330 return 2; 1331 1332 /* Base-64 decode value */ 1333 value_decoded = base64_decode(value, strlen(value), &value_len); 1334 if (value_decoded == NULL) { 1335 free(name_decoded); 1336 return 1; 1337 } 1338 1339 archive_entry_xattr_add_entry(entry, name_decoded, 1340 value_decoded, value_len); 1341 1342 free(name_decoded); 1343 free(value_decoded); 1344 return 0; 1345 } 1346 1347 /* 1348 * Parse a single key=value attribute. key/value pointers are 1349 * assumed to point into reasonably long-lived storage. 1350 * 1351 * Note that POSIX reserves all-lowercase keywords. Vendor-specific 1352 * extensions should always have keywords of the form "VENDOR.attribute" 1353 * In particular, it's quite feasible to support many different 1354 * vendor extensions here. I'm using "LIBARCHIVE" for extensions 1355 * unique to this library. 1356 * 1357 * Investigate other vendor-specific extensions and see if 1358 * any of them look useful. 1359 */ 1360 static int 1361 pax_attribute(struct tar *tar, struct archive_entry *entry, 1362 char *key, char *value) 1363 { 1364 int64_t s; 1365 long n; 1366 wchar_t *wp; 1367 1368 switch (key[0]) { 1369 case 'G': 1370 /* GNU "0.0" sparse pax format. */ 1371 if (strcmp(key, "GNU.sparse.numblocks") == 0) { 1372 tar->sparse_offset = -1; 1373 tar->sparse_numbytes = -1; 1374 tar->sparse_gnu_major = 0; 1375 tar->sparse_gnu_minor = 0; 1376 } 1377 if (strcmp(key, "GNU.sparse.offset") == 0) { 1378 tar->sparse_offset = tar_atol10(value, strlen(value)); 1379 if (tar->sparse_numbytes != -1) { 1380 gnu_add_sparse_entry(tar, 1381 tar->sparse_offset, tar->sparse_numbytes); 1382 tar->sparse_offset = -1; 1383 tar->sparse_numbytes = -1; 1384 } 1385 } 1386 if (strcmp(key, "GNU.sparse.numbytes") == 0) { 1387 tar->sparse_numbytes = tar_atol10(value, strlen(value)); 1388 if (tar->sparse_numbytes != -1) { 1389 gnu_add_sparse_entry(tar, 1390 tar->sparse_offset, tar->sparse_numbytes); 1391 tar->sparse_offset = -1; 1392 tar->sparse_numbytes = -1; 1393 } 1394 } 1395 if (strcmp(key, "GNU.sparse.size") == 0) { 1396 tar->realsize = tar_atol10(value, strlen(value)); 1397 archive_entry_set_size(entry, tar->realsize); 1398 } 1399 1400 /* GNU "0.1" sparse pax format. */ 1401 if (strcmp(key, "GNU.sparse.map") == 0) { 1402 tar->sparse_gnu_major = 0; 1403 tar->sparse_gnu_minor = 1; 1404 if (gnu_sparse_01_parse(tar, value) != ARCHIVE_OK) 1405 return (ARCHIVE_WARN); 1406 } 1407 1408 /* GNU "1.0" sparse pax format */ 1409 if (strcmp(key, "GNU.sparse.major") == 0) { 1410 tar->sparse_gnu_major = tar_atol10(value, strlen(value)); 1411 tar->sparse_gnu_pending = 1; 1412 } 1413 if (strcmp(key, "GNU.sparse.minor") == 0) { 1414 tar->sparse_gnu_minor = tar_atol10(value, strlen(value)); 1415 tar->sparse_gnu_pending = 1; 1416 } 1417 if (strcmp(key, "GNU.sparse.name") == 0) { 1418 /* 1419 * The real filename; when storing sparse 1420 * files, GNU tar puts a synthesized name into 1421 * the regular 'path' attribute in an attempt 1422 * to limit confusion. ;-) 1423 */ 1424 archive_strcpy(&(tar->entry_pathname_override), value); 1425 } 1426 if (strcmp(key, "GNU.sparse.realsize") == 0) { 1427 tar->realsize = tar_atol10(value, strlen(value)); 1428 archive_entry_set_size(entry, tar->realsize); 1429 } 1430 break; 1431 case 'L': 1432 /* Our extensions */ 1433 /* TODO: Handle arbitrary extended attributes... */ 1434 /* 1435 if (strcmp(key, "LIBARCHIVE.xxxxxxx")==0) 1436 archive_entry_set_xxxxxx(entry, value); 1437 */ 1438 if (strcmp(key, "LIBARCHIVE.creationtime")==0) { 1439 pax_time(value, &s, &n); 1440 archive_entry_set_birthtime(entry, s, n); 1441 } 1442 if (strncmp(key, "LIBARCHIVE.xattr.", 17)==0) 1443 pax_attribute_xattr(entry, key, value); 1444 break; 1445 case 'S': 1446 /* We support some keys used by the "star" archiver */ 1447 if (strcmp(key, "SCHILY.acl.access")==0) { 1448 wp = utf8_decode(tar, value, strlen(value)); 1449 /* TODO: if (wp == NULL) */ 1450 __archive_entry_acl_parse_w(entry, wp, 1451 ARCHIVE_ENTRY_ACL_TYPE_ACCESS); 1452 } else if (strcmp(key, "SCHILY.acl.default")==0) { 1453 wp = utf8_decode(tar, value, strlen(value)); 1454 /* TODO: if (wp == NULL) */ 1455 __archive_entry_acl_parse_w(entry, wp, 1456 ARCHIVE_ENTRY_ACL_TYPE_DEFAULT); 1457 } else if (strcmp(key, "SCHILY.devmajor")==0) { 1458 archive_entry_set_rdevmajor(entry, 1459 tar_atol10(value, strlen(value))); 1460 } else if (strcmp(key, "SCHILY.devminor")==0) { 1461 archive_entry_set_rdevminor(entry, 1462 tar_atol10(value, strlen(value))); 1463 } else if (strcmp(key, "SCHILY.fflags")==0) { 1464 archive_entry_copy_fflags_text(entry, value); 1465 } else if (strcmp(key, "SCHILY.dev")==0) { 1466 archive_entry_set_dev(entry, 1467 tar_atol10(value, strlen(value))); 1468 } else if (strcmp(key, "SCHILY.ino")==0) { 1469 archive_entry_set_ino(entry, 1470 tar_atol10(value, strlen(value))); 1471 } else if (strcmp(key, "SCHILY.nlink")==0) { 1472 archive_entry_set_nlink(entry, 1473 tar_atol10(value, strlen(value))); 1474 } else if (strcmp(key, "SCHILY.realsize")==0) { 1475 tar->realsize = tar_atol10(value, strlen(value)); 1476 archive_entry_set_size(entry, tar->realsize); 1477 } 1478 break; 1479 case 'a': 1480 if (strcmp(key, "atime")==0) { 1481 pax_time(value, &s, &n); 1482 archive_entry_set_atime(entry, s, n); 1483 } 1484 break; 1485 case 'c': 1486 if (strcmp(key, "ctime")==0) { 1487 pax_time(value, &s, &n); 1488 archive_entry_set_ctime(entry, s, n); 1489 } else if (strcmp(key, "charset")==0) { 1490 /* TODO: Publish charset information in entry. */ 1491 } else if (strcmp(key, "comment")==0) { 1492 /* TODO: Publish comment in entry. */ 1493 } 1494 break; 1495 case 'g': 1496 if (strcmp(key, "gid")==0) { 1497 archive_entry_set_gid(entry, 1498 tar_atol10(value, strlen(value))); 1499 } else if (strcmp(key, "gname")==0) { 1500 archive_strcpy(&(tar->entry_gname), value); 1501 } 1502 break; 1503 case 'h': 1504 if (strcmp(key, "hdrcharset") == 0) { 1505 if (strcmp(value, "BINARY") == 0) 1506 tar->pax_hdrcharset_binary = 1; 1507 else if (strcmp(value, "ISO-IR 10646 2000 UTF-8") == 0) 1508 tar->pax_hdrcharset_binary = 0; 1509 else { 1510 /* TODO: Warn about unsupported hdrcharset */ 1511 } 1512 } 1513 break; 1514 case 'l': 1515 /* pax interchange doesn't distinguish hardlink vs. symlink. */ 1516 if (strcmp(key, "linkpath")==0) { 1517 archive_strcpy(&(tar->entry_linkpath), value); 1518 } 1519 break; 1520 case 'm': 1521 if (strcmp(key, "mtime")==0) { 1522 pax_time(value, &s, &n); 1523 archive_entry_set_mtime(entry, s, n); 1524 } 1525 break; 1526 case 'p': 1527 if (strcmp(key, "path")==0) { 1528 archive_strcpy(&(tar->entry_pathname), value); 1529 } 1530 break; 1531 case 'r': 1532 /* POSIX has reserved 'realtime.*' */ 1533 break; 1534 case 's': 1535 /* POSIX has reserved 'security.*' */ 1536 /* Someday: if (strcmp(key, "security.acl")==0) { ... } */ 1537 if (strcmp(key, "size")==0) { 1538 /* "size" is the size of the data in the entry. */ 1539 tar->entry_bytes_remaining 1540 = tar_atol10(value, strlen(value)); 1541 /* 1542 * But, "size" is not necessarily the size of 1543 * the file on disk; if this is a sparse file, 1544 * the disk size may have already been set from 1545 * GNU.sparse.realsize or GNU.sparse.size or 1546 * an old GNU header field or SCHILY.realsize 1547 * or .... 1548 */ 1549 if (tar->realsize < 0) { 1550 archive_entry_set_size(entry, 1551 tar->entry_bytes_remaining); 1552 tar->realsize 1553 = tar->entry_bytes_remaining; 1554 } 1555 } 1556 break; 1557 case 'u': 1558 if (strcmp(key, "uid")==0) { 1559 archive_entry_set_uid(entry, 1560 tar_atol10(value, strlen(value))); 1561 } else if (strcmp(key, "uname")==0) { 1562 archive_strcpy(&(tar->entry_uname), value); 1563 } 1564 break; 1565 } 1566 return (0); 1567 } 1568 1569 1570 1571 /* 1572 * parse a decimal time value, which may include a fractional portion 1573 */ 1574 static void 1575 pax_time(const char *p, int64_t *ps, long *pn) 1576 { 1577 char digit; 1578 int64_t s; 1579 unsigned long l; 1580 int sign; 1581 int64_t limit, last_digit_limit; 1582 1583 limit = INT64_MAX / 10; 1584 last_digit_limit = INT64_MAX % 10; 1585 1586 s = 0; 1587 sign = 1; 1588 if (*p == '-') { 1589 sign = -1; 1590 p++; 1591 } 1592 while (*p >= '0' && *p <= '9') { 1593 digit = *p - '0'; 1594 if (s > limit || 1595 (s == limit && digit > last_digit_limit)) { 1596 s = UINT64_MAX; 1597 break; 1598 } 1599 s = (s * 10) + digit; 1600 ++p; 1601 } 1602 1603 *ps = s * sign; 1604 1605 /* Calculate nanoseconds. */ 1606 *pn = 0; 1607 1608 if (*p != '.') 1609 return; 1610 1611 l = 100000000UL; 1612 do { 1613 ++p; 1614 if (*p >= '0' && *p <= '9') 1615 *pn += (*p - '0') * l; 1616 else 1617 break; 1618 } while (l /= 10); 1619 } 1620 1621 /* 1622 * Parse GNU tar header 1623 */ 1624 static int 1625 header_gnutar(struct archive_read *a, struct tar *tar, 1626 struct archive_entry *entry, const void *h) 1627 { 1628 const struct archive_entry_header_gnutar *header; 1629 1630 (void)a; 1631 1632 /* 1633 * GNU header is like POSIX ustar, except 'prefix' is 1634 * replaced with some other fields. This also means the 1635 * filename is stored as in old-style archives. 1636 */ 1637 1638 /* Grab fields common to all tar variants. */ 1639 header_common(a, tar, entry, h); 1640 1641 /* Copy filename over (to ensure null termination). */ 1642 header = (const struct archive_entry_header_gnutar *)h; 1643 archive_strncpy(&(tar->entry_pathname), header->name, 1644 sizeof(header->name)); 1645 archive_entry_copy_pathname(entry, tar->entry_pathname.s); 1646 1647 /* Fields common to ustar and GNU */ 1648 /* XXX Can the following be factored out since it's common 1649 * to ustar and gnu tar? Is it okay to move it down into 1650 * header_common, perhaps? */ 1651 archive_strncpy(&(tar->entry_uname), 1652 header->uname, sizeof(header->uname)); 1653 archive_entry_copy_uname(entry, tar->entry_uname.s); 1654 1655 archive_strncpy(&(tar->entry_gname), 1656 header->gname, sizeof(header->gname)); 1657 archive_entry_copy_gname(entry, tar->entry_gname.s); 1658 1659 /* Parse out device numbers only for char and block specials */ 1660 if (header->typeflag[0] == '3' || header->typeflag[0] == '4') { 1661 archive_entry_set_rdevmajor(entry, 1662 tar_atol(header->rdevmajor, sizeof(header->rdevmajor))); 1663 archive_entry_set_rdevminor(entry, 1664 tar_atol(header->rdevminor, sizeof(header->rdevminor))); 1665 } else 1666 archive_entry_set_rdev(entry, 0); 1667 1668 tar->entry_padding = 0x1ff & (-tar->entry_bytes_remaining); 1669 1670 /* Grab GNU-specific fields. */ 1671 archive_entry_set_atime(entry, 1672 tar_atol(header->atime, sizeof(header->atime)), 0); 1673 archive_entry_set_ctime(entry, 1674 tar_atol(header->ctime, sizeof(header->ctime)), 0); 1675 if (header->realsize[0] != 0) { 1676 tar->realsize 1677 = tar_atol(header->realsize, sizeof(header->realsize)); 1678 archive_entry_set_size(entry, tar->realsize); 1679 } 1680 1681 if (header->sparse[0].offset[0] != 0) { 1682 gnu_sparse_old_read(a, tar, header); 1683 } else { 1684 if (header->isextended[0] != 0) { 1685 /* XXX WTF? XXX */ 1686 } 1687 } 1688 1689 return (0); 1690 } 1691 1692 static void 1693 gnu_add_sparse_entry(struct tar *tar, off_t offset, off_t remaining) 1694 { 1695 struct sparse_block *p; 1696 1697 p = (struct sparse_block *)malloc(sizeof(*p)); 1698 if (p == NULL) 1699 __archive_errx(1, "Out of memory"); 1700 memset(p, 0, sizeof(*p)); 1701 if (tar->sparse_last != NULL) 1702 tar->sparse_last->next = p; 1703 else 1704 tar->sparse_list = p; 1705 tar->sparse_last = p; 1706 p->offset = offset; 1707 p->remaining = remaining; 1708 } 1709 1710 static void 1711 gnu_clear_sparse_list(struct tar *tar) 1712 { 1713 struct sparse_block *p; 1714 1715 while (tar->sparse_list != NULL) { 1716 p = tar->sparse_list; 1717 tar->sparse_list = p->next; 1718 free(p); 1719 } 1720 tar->sparse_last = NULL; 1721 } 1722 1723 /* 1724 * GNU tar old-format sparse data. 1725 * 1726 * GNU old-format sparse data is stored in a fixed-field 1727 * format. Offset/size values are 11-byte octal fields (same 1728 * format as 'size' field in ustart header). These are 1729 * stored in the header, allocating subsequent header blocks 1730 * as needed. Extending the header in this way is a pretty 1731 * severe POSIX violation; this design has earned GNU tar a 1732 * lot of criticism. 1733 */ 1734 1735 static int 1736 gnu_sparse_old_read(struct archive_read *a, struct tar *tar, 1737 const struct archive_entry_header_gnutar *header) 1738 { 1739 ssize_t bytes_read; 1740 const void *data; 1741 struct extended { 1742 struct gnu_sparse sparse[21]; 1743 char isextended[1]; 1744 char padding[7]; 1745 }; 1746 const struct extended *ext; 1747 1748 gnu_sparse_old_parse(tar, header->sparse, 4); 1749 if (header->isextended[0] == 0) 1750 return (ARCHIVE_OK); 1751 1752 do { 1753 data = __archive_read_ahead(a, 512, &bytes_read); 1754 if (bytes_read < 0) 1755 return (ARCHIVE_FATAL); 1756 if (bytes_read < 512) { 1757 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 1758 "Truncated tar archive " 1759 "detected while reading sparse file data"); 1760 return (ARCHIVE_FATAL); 1761 } 1762 __archive_read_consume(a, 512); 1763 ext = (const struct extended *)data; 1764 gnu_sparse_old_parse(tar, ext->sparse, 21); 1765 } while (ext->isextended[0] != 0); 1766 if (tar->sparse_list != NULL) 1767 tar->entry_offset = tar->sparse_list->offset; 1768 return (ARCHIVE_OK); 1769 } 1770 1771 static void 1772 gnu_sparse_old_parse(struct tar *tar, 1773 const struct gnu_sparse *sparse, int length) 1774 { 1775 while (length > 0 && sparse->offset[0] != 0) { 1776 gnu_add_sparse_entry(tar, 1777 tar_atol(sparse->offset, sizeof(sparse->offset)), 1778 tar_atol(sparse->numbytes, sizeof(sparse->numbytes))); 1779 sparse++; 1780 length--; 1781 } 1782 } 1783 1784 /* 1785 * GNU tar sparse format 0.0 1786 * 1787 * Beginning with GNU tar 1.15, sparse files are stored using 1788 * information in the pax extended header. The GNU tar maintainers 1789 * have gone through a number of variations in the process of working 1790 * out this scheme; furtunately, they're all numbered. 1791 * 1792 * Sparse format 0.0 uses attribute GNU.sparse.numblocks to store the 1793 * number of blocks, and GNU.sparse.offset/GNU.sparse.numbytes to 1794 * store offset/size for each block. The repeated instances of these 1795 * latter fields violate the pax specification (which frowns on 1796 * duplicate keys), so this format was quickly replaced. 1797 */ 1798 1799 /* 1800 * GNU tar sparse format 0.1 1801 * 1802 * This version replaced the offset/numbytes attributes with 1803 * a single "map" attribute that stored a list of integers. This 1804 * format had two problems: First, the "map" attribute could be very 1805 * long, which caused problems for some implementations. More 1806 * importantly, the sparse data was lost when extracted by archivers 1807 * that didn't recognize this extension. 1808 */ 1809 1810 static int 1811 gnu_sparse_01_parse(struct tar *tar, const char *p) 1812 { 1813 const char *e; 1814 off_t offset = -1, size = -1; 1815 1816 for (;;) { 1817 e = p; 1818 while (*e != '\0' && *e != ',') { 1819 if (*e < '0' || *e > '9') 1820 return (ARCHIVE_WARN); 1821 e++; 1822 } 1823 if (offset < 0) { 1824 offset = tar_atol10(p, e - p); 1825 if (offset < 0) 1826 return (ARCHIVE_WARN); 1827 } else { 1828 size = tar_atol10(p, e - p); 1829 if (size < 0) 1830 return (ARCHIVE_WARN); 1831 gnu_add_sparse_entry(tar, offset, size); 1832 offset = -1; 1833 } 1834 if (*e == '\0') 1835 return (ARCHIVE_OK); 1836 p = e + 1; 1837 } 1838 } 1839 1840 /* 1841 * GNU tar sparse format 1.0 1842 * 1843 * The idea: The offset/size data is stored as a series of base-10 1844 * ASCII numbers prepended to the file data, so that dearchivers that 1845 * don't support this format will extract the block map along with the 1846 * data and a separate post-process can restore the sparseness. 1847 * 1848 * Unfortunately, GNU tar 1.16 had a bug that added unnecessary 1849 * padding to the body of the file when using this format. GNU tar 1850 * 1.17 corrected this bug without bumping the version number, so 1851 * it's not possible to support both variants. This code supports 1852 * the later variant at the expense of not supporting the former. 1853 * 1854 * This variant also replaced GNU.sparse.size with GNU.sparse.realsize 1855 * and introduced the GNU.sparse.major/GNU.sparse.minor attributes. 1856 */ 1857 1858 /* 1859 * Read the next line from the input, and parse it as a decimal 1860 * integer followed by '\n'. Returns positive integer value or 1861 * negative on error. 1862 */ 1863 static int64_t 1864 gnu_sparse_10_atol(struct archive_read *a, struct tar *tar, 1865 ssize_t *remaining) 1866 { 1867 int64_t l, limit, last_digit_limit; 1868 const char *p; 1869 ssize_t bytes_read; 1870 int base, digit; 1871 1872 base = 10; 1873 limit = INT64_MAX / base; 1874 last_digit_limit = INT64_MAX % base; 1875 1876 /* 1877 * Skip any lines starting with '#'; GNU tar specs 1878 * don't require this, but they should. 1879 */ 1880 do { 1881 bytes_read = readline(a, tar, &p, tar_min(*remaining, 100)); 1882 if (bytes_read <= 0) 1883 return (ARCHIVE_FATAL); 1884 *remaining -= bytes_read; 1885 } while (p[0] == '#'); 1886 1887 l = 0; 1888 while (bytes_read > 0) { 1889 if (*p == '\n') 1890 return (l); 1891 if (*p < '0' || *p >= '0' + base) 1892 return (ARCHIVE_WARN); 1893 digit = *p - '0'; 1894 if (l > limit || (l == limit && digit > last_digit_limit)) 1895 l = UINT64_MAX; /* Truncate on overflow. */ 1896 else 1897 l = (l * base) + digit; 1898 p++; 1899 bytes_read--; 1900 } 1901 /* TODO: Error message. */ 1902 return (ARCHIVE_WARN); 1903 } 1904 1905 /* 1906 * Returns length (in bytes) of the sparse data description 1907 * that was read. 1908 */ 1909 static ssize_t 1910 gnu_sparse_10_read(struct archive_read *a, struct tar *tar) 1911 { 1912 ssize_t remaining, bytes_read; 1913 int entries; 1914 off_t offset, size, to_skip; 1915 1916 /* Clear out the existing sparse list. */ 1917 gnu_clear_sparse_list(tar); 1918 1919 remaining = tar->entry_bytes_remaining; 1920 1921 /* Parse entries. */ 1922 entries = gnu_sparse_10_atol(a, tar, &remaining); 1923 if (entries < 0) 1924 return (ARCHIVE_FATAL); 1925 /* Parse the individual entries. */ 1926 while (entries-- > 0) { 1927 /* Parse offset/size */ 1928 offset = gnu_sparse_10_atol(a, tar, &remaining); 1929 if (offset < 0) 1930 return (ARCHIVE_FATAL); 1931 size = gnu_sparse_10_atol(a, tar, &remaining); 1932 if (size < 0) 1933 return (ARCHIVE_FATAL); 1934 /* Add a new sparse entry. */ 1935 gnu_add_sparse_entry(tar, offset, size); 1936 } 1937 /* Skip rest of block... */ 1938 bytes_read = tar->entry_bytes_remaining - remaining; 1939 to_skip = 0x1ff & -bytes_read; 1940 if (to_skip != __archive_read_skip(a, to_skip)) 1941 return (ARCHIVE_FATAL); 1942 return (bytes_read + to_skip); 1943 } 1944 1945 /*- 1946 * Convert text->integer. 1947 * 1948 * Traditional tar formats (including POSIX) specify base-8 for 1949 * all of the standard numeric fields. This is a significant limitation 1950 * in practice: 1951 * = file size is limited to 8GB 1952 * = rdevmajor and rdevminor are limited to 21 bits 1953 * = uid/gid are limited to 21 bits 1954 * 1955 * There are two workarounds for this: 1956 * = pax extended headers, which use variable-length string fields 1957 * = GNU tar and STAR both allow either base-8 or base-256 in 1958 * most fields. The high bit is set to indicate base-256. 1959 * 1960 * On read, this implementation supports both extensions. 1961 */ 1962 static int64_t 1963 tar_atol(const char *p, unsigned char_cnt) 1964 { 1965 /* 1966 * Technically, GNU tar considers a field to be in base-256 1967 * only if the first byte is 0xff or 0x80. 1968 */ 1969 if (*p & 0x80) 1970 return (tar_atol256(p, char_cnt)); 1971 return (tar_atol8(p, char_cnt)); 1972 } 1973 1974 /* 1975 * Note that this implementation does not (and should not!) obey 1976 * locale settings; you cannot simply substitute strtol here, since 1977 * it does obey locale. 1978 */ 1979 static int64_t 1980 tar_atol8(const char *p, unsigned char_cnt) 1981 { 1982 int64_t l, limit, last_digit_limit; 1983 int digit, sign, base; 1984 1985 base = 8; 1986 limit = INT64_MAX / base; 1987 last_digit_limit = INT64_MAX % base; 1988 1989 while (*p == ' ' || *p == '\t') 1990 p++; 1991 if (*p == '-') { 1992 sign = -1; 1993 p++; 1994 } else 1995 sign = 1; 1996 1997 l = 0; 1998 digit = *p - '0'; 1999 while (digit >= 0 && digit < base && char_cnt-- > 0) { 2000 if (l>limit || (l == limit && digit > last_digit_limit)) { 2001 l = UINT64_MAX; /* Truncate on overflow. */ 2002 break; 2003 } 2004 l = (l * base) + digit; 2005 digit = *++p - '0'; 2006 } 2007 return (sign < 0) ? -l : l; 2008 } 2009 2010 /* 2011 * Note that this implementation does not (and should not!) obey 2012 * locale settings; you cannot simply substitute strtol here, since 2013 * it does obey locale. 2014 */ 2015 static int64_t 2016 tar_atol10(const char *p, unsigned char_cnt) 2017 { 2018 int64_t l, limit, last_digit_limit; 2019 int base, digit, sign; 2020 2021 base = 10; 2022 limit = INT64_MAX / base; 2023 last_digit_limit = INT64_MAX % base; 2024 2025 while (*p == ' ' || *p == '\t') 2026 p++; 2027 if (*p == '-') { 2028 sign = -1; 2029 p++; 2030 } else 2031 sign = 1; 2032 2033 l = 0; 2034 digit = *p - '0'; 2035 while (digit >= 0 && digit < base && char_cnt-- > 0) { 2036 if (l > limit || (l == limit && digit > last_digit_limit)) { 2037 l = UINT64_MAX; /* Truncate on overflow. */ 2038 break; 2039 } 2040 l = (l * base) + digit; 2041 digit = *++p - '0'; 2042 } 2043 return (sign < 0) ? -l : l; 2044 } 2045 2046 /* 2047 * Parse a base-256 integer. This is just a straight signed binary 2048 * value in big-endian order, except that the high-order bit is 2049 * ignored. 2050 */ 2051 static int64_t 2052 tar_atol256(const char *_p, unsigned char_cnt) 2053 { 2054 int64_t l, upper_limit, lower_limit; 2055 const unsigned char *p = (const unsigned char *)_p; 2056 2057 upper_limit = INT64_MAX / 256; 2058 lower_limit = INT64_MIN / 256; 2059 2060 /* Pad with 1 or 0 bits, depending on sign. */ 2061 if ((0x40 & *p) == 0x40) 2062 l = (int64_t)-1; 2063 else 2064 l = 0; 2065 l = (l << 6) | (0x3f & *p++); 2066 while (--char_cnt > 0) { 2067 if (l > upper_limit) { 2068 l = INT64_MAX; /* Truncate on overflow */ 2069 break; 2070 } else if (l < lower_limit) { 2071 l = INT64_MIN; 2072 break; 2073 } 2074 l = (l << 8) | (0xff & (int64_t)*p++); 2075 } 2076 return (l); 2077 } 2078 2079 /* 2080 * Returns length of line (including trailing newline) 2081 * or negative on error. 'start' argument is updated to 2082 * point to first character of line. This avoids copying 2083 * when possible. 2084 */ 2085 static ssize_t 2086 readline(struct archive_read *a, struct tar *tar, const char **start, 2087 ssize_t limit) 2088 { 2089 ssize_t bytes_read; 2090 ssize_t total_size = 0; 2091 const void *t; 2092 const char *s; 2093 void *p; 2094 2095 t = __archive_read_ahead(a, 1, &bytes_read); 2096 if (bytes_read <= 0) 2097 return (ARCHIVE_FATAL); 2098 s = t; /* Start of line? */ 2099 p = memchr(t, '\n', bytes_read); 2100 /* If we found '\n' in the read buffer, return pointer to that. */ 2101 if (p != NULL) { 2102 bytes_read = 1 + ((const char *)p) - s; 2103 if (bytes_read > limit) { 2104 archive_set_error(&a->archive, 2105 ARCHIVE_ERRNO_FILE_FORMAT, 2106 "Line too long"); 2107 return (ARCHIVE_FATAL); 2108 } 2109 __archive_read_consume(a, bytes_read); 2110 *start = s; 2111 return (bytes_read); 2112 } 2113 /* Otherwise, we need to accumulate in a line buffer. */ 2114 for (;;) { 2115 if (total_size + bytes_read > limit) { 2116 archive_set_error(&a->archive, 2117 ARCHIVE_ERRNO_FILE_FORMAT, 2118 "Line too long"); 2119 return (ARCHIVE_FATAL); 2120 } 2121 if (archive_string_ensure(&tar->line, total_size + bytes_read) == NULL) { 2122 archive_set_error(&a->archive, ENOMEM, 2123 "Can't allocate working buffer"); 2124 return (ARCHIVE_FATAL); 2125 } 2126 memcpy(tar->line.s + total_size, t, bytes_read); 2127 __archive_read_consume(a, bytes_read); 2128 total_size += bytes_read; 2129 /* If we found '\n', clean up and return. */ 2130 if (p != NULL) { 2131 *start = tar->line.s; 2132 return (total_size); 2133 } 2134 /* Read some more. */ 2135 t = __archive_read_ahead(a, 1, &bytes_read); 2136 if (bytes_read <= 0) 2137 return (ARCHIVE_FATAL); 2138 s = t; /* Start of line? */ 2139 p = memchr(t, '\n', bytes_read); 2140 /* If we found '\n', trim the read. */ 2141 if (p != NULL) { 2142 bytes_read = 1 + ((const char *)p) - s; 2143 } 2144 } 2145 } 2146 2147 static wchar_t * 2148 utf8_decode(struct tar *tar, const char *src, size_t length) 2149 { 2150 wchar_t *dest; 2151 ssize_t n; 2152 2153 /* Ensure pax_entry buffer is big enough. */ 2154 if (tar->pax_entry_length <= length) { 2155 wchar_t *old_entry = tar->pax_entry; 2156 2157 if (tar->pax_entry_length <= 0) 2158 tar->pax_entry_length = 1024; 2159 while (tar->pax_entry_length <= length + 1) 2160 tar->pax_entry_length *= 2; 2161 2162 old_entry = tar->pax_entry; 2163 tar->pax_entry = (wchar_t *)realloc(tar->pax_entry, 2164 tar->pax_entry_length * sizeof(wchar_t)); 2165 if (tar->pax_entry == NULL) { 2166 free(old_entry); 2167 /* TODO: Handle this error. */ 2168 return (NULL); 2169 } 2170 } 2171 2172 dest = tar->pax_entry; 2173 while (length > 0) { 2174 n = UTF8_mbrtowc(dest, src, length); 2175 if (n < 0) 2176 return (NULL); 2177 if (n == 0) 2178 break; 2179 dest++; 2180 src += n; 2181 length -= n; 2182 } 2183 *dest++ = L'\0'; 2184 return (tar->pax_entry); 2185 } 2186 2187 /* 2188 * Copied and simplified from FreeBSD libc/locale. 2189 */ 2190 static ssize_t 2191 UTF8_mbrtowc(wchar_t *pwc, const char *s, size_t n) 2192 { 2193 int ch, i, len, mask; 2194 unsigned long wch; 2195 2196 if (s == NULL || n == 0 || pwc == NULL) 2197 return (0); 2198 2199 /* 2200 * Determine the number of octets that make up this character from 2201 * the first octet, and a mask that extracts the interesting bits of 2202 * the first octet. 2203 */ 2204 ch = (unsigned char)*s; 2205 if ((ch & 0x80) == 0) { 2206 mask = 0x7f; 2207 len = 1; 2208 } else if ((ch & 0xe0) == 0xc0) { 2209 mask = 0x1f; 2210 len = 2; 2211 } else if ((ch & 0xf0) == 0xe0) { 2212 mask = 0x0f; 2213 len = 3; 2214 } else if ((ch & 0xf8) == 0xf0) { 2215 mask = 0x07; 2216 len = 4; 2217 } else { 2218 /* Invalid first byte. */ 2219 return (-1); 2220 } 2221 2222 if (n < (size_t)len) { 2223 /* Valid first byte but truncated. */ 2224 return (-2); 2225 } 2226 2227 /* 2228 * Decode the octet sequence representing the character in chunks 2229 * of 6 bits, most significant first. 2230 */ 2231 wch = (unsigned char)*s++ & mask; 2232 i = len; 2233 while (--i != 0) { 2234 if ((*s & 0xc0) != 0x80) { 2235 /* Invalid intermediate byte; consume one byte and 2236 * emit '?' */ 2237 *pwc = '?'; 2238 return (1); 2239 } 2240 wch <<= 6; 2241 wch |= *s++ & 0x3f; 2242 } 2243 2244 /* Assign the value to the output; out-of-range values 2245 * just get truncated. */ 2246 *pwc = (wchar_t)wch; 2247 #ifdef WCHAR_MAX 2248 /* 2249 * If platform has WCHAR_MAX, we can do something 2250 * more sensible with out-of-range values. 2251 */ 2252 if (wch >= WCHAR_MAX) 2253 *pwc = '?'; 2254 #endif 2255 /* Return number of bytes input consumed: 0 for end-of-string. */ 2256 return (wch == L'\0' ? 0 : len); 2257 } 2258 2259 2260 /* 2261 * base64_decode - Base64 decode 2262 * 2263 * This accepts most variations of base-64 encoding, including: 2264 * * with or without line breaks 2265 * * with or without the final group padded with '=' or '_' characters 2266 * (The most economical Base-64 variant does not pad the last group and 2267 * omits line breaks; RFC1341 used for MIME requires both.) 2268 */ 2269 static char * 2270 base64_decode(const char *s, size_t len, size_t *out_len) 2271 { 2272 static const unsigned char digits[64] = { 2273 'A','B','C','D','E','F','G','H','I','J','K','L','M','N', 2274 'O','P','Q','R','S','T','U','V','W','X','Y','Z','a','b', 2275 'c','d','e','f','g','h','i','j','k','l','m','n','o','p', 2276 'q','r','s','t','u','v','w','x','y','z','0','1','2','3', 2277 '4','5','6','7','8','9','+','/' }; 2278 static unsigned char decode_table[128]; 2279 char *out, *d; 2280 const unsigned char *src = (const unsigned char *)s; 2281 2282 /* If the decode table is not yet initialized, prepare it. */ 2283 if (decode_table[digits[1]] != 1) { 2284 size_t i; 2285 memset(decode_table, 0xff, sizeof(decode_table)); 2286 for (i = 0; i < sizeof(digits); i++) 2287 decode_table[digits[i]] = i; 2288 } 2289 2290 /* Allocate enough space to hold the entire output. */ 2291 /* Note that we may not use all of this... */ 2292 out = (char *)malloc(len - len / 4 + 1); 2293 if (out == NULL) { 2294 *out_len = 0; 2295 return (NULL); 2296 } 2297 d = out; 2298 2299 while (len > 0) { 2300 /* Collect the next group of (up to) four characters. */ 2301 int v = 0; 2302 int group_size = 0; 2303 while (group_size < 4 && len > 0) { 2304 /* '=' or '_' padding indicates final group. */ 2305 if (*src == '=' || *src == '_') { 2306 len = 0; 2307 break; 2308 } 2309 /* Skip illegal characters (including line breaks) */ 2310 if (*src > 127 || *src < 32 2311 || decode_table[*src] == 0xff) { 2312 len--; 2313 src++; 2314 continue; 2315 } 2316 v <<= 6; 2317 v |= decode_table[*src++]; 2318 len --; 2319 group_size++; 2320 } 2321 /* Align a short group properly. */ 2322 v <<= 6 * (4 - group_size); 2323 /* Unpack the group we just collected. */ 2324 switch (group_size) { 2325 case 4: d[2] = v & 0xff; 2326 /* FALLTHROUGH */ 2327 case 3: d[1] = (v >> 8) & 0xff; 2328 /* FALLTHROUGH */ 2329 case 2: d[0] = (v >> 16) & 0xff; 2330 break; 2331 case 1: /* this is invalid! */ 2332 break; 2333 } 2334 d += group_size * 3 / 4; 2335 } 2336 2337 *out_len = d - out; 2338 return (out); 2339 } 2340 2341 static char * 2342 url_decode(const char *in) 2343 { 2344 char *out, *d; 2345 const char *s; 2346 2347 out = (char *)malloc(strlen(in) + 1); 2348 if (out == NULL) 2349 return (NULL); 2350 for (s = in, d = out; *s != '\0'; ) { 2351 if (s[0] == '%' && s[1] != '\0' && s[2] != '\0') { 2352 /* Try to convert % escape */ 2353 int digit1 = tohex(s[1]); 2354 int digit2 = tohex(s[2]); 2355 if (digit1 >= 0 && digit2 >= 0) { 2356 /* Looks good, consume three chars */ 2357 s += 3; 2358 /* Convert output */ 2359 *d++ = ((digit1 << 4) | digit2); 2360 continue; 2361 } 2362 /* Else fall through and treat '%' as normal char */ 2363 } 2364 *d++ = *s++; 2365 } 2366 *d = '\0'; 2367 return (out); 2368 } 2369 2370 static int 2371 tohex(int c) 2372 { 2373 if (c >= '0' && c <= '9') 2374 return (c - '0'); 2375 else if (c >= 'A' && c <= 'F') 2376 return (c - 'A' + 10); 2377 else if (c >= 'a' && c <= 'f') 2378 return (c - 'a' + 10); 2379 else 2380 return (-1); 2381 } 2382