1 /*- 2 * Copyright (c) 2003-2007 Tim Kientzle 3 * Copyright (c) 2010-2012 Michihiro NAKAJIMA 4 * Copyright (c) 2016 Martin Matuska 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28 #include "archive_platform.h" 29 __FBSDID("$FreeBSD$"); 30 31 #ifdef HAVE_ERRNO_H 32 #include <errno.h> 33 #endif 34 #ifdef HAVE_STDLIB_H 35 #include <stdlib.h> 36 #endif 37 #ifdef HAVE_STRING_H 38 #include <string.h> 39 #endif 40 41 #include "archive.h" 42 #include "archive_entry.h" 43 #include "archive_entry_locale.h" 44 #include "archive_private.h" 45 #include "archive_write_private.h" 46 #include "archive_write_set_format_private.h" 47 48 struct sparse_block { 49 struct sparse_block *next; 50 int is_hole; 51 uint64_t offset; 52 uint64_t remaining; 53 }; 54 55 struct pax { 56 uint64_t entry_bytes_remaining; 57 uint64_t entry_padding; 58 struct archive_string l_url_encoded_name; 59 struct archive_string pax_header; 60 struct archive_string sparse_map; 61 size_t sparse_map_padding; 62 struct sparse_block *sparse_list; 63 struct sparse_block *sparse_tail; 64 struct archive_string_conv *sconv_utf8; 65 int opt_binary; 66 67 unsigned flags; 68 #define WRITE_SCHILY_XATTR (1 << 0) 69 #define WRITE_LIBARCHIVE_XATTR (1 << 1) 70 }; 71 72 static void add_pax_attr(struct archive_string *, const char *key, 73 const char *value); 74 static void add_pax_attr_binary(struct archive_string *, 75 const char *key, 76 const char *value, size_t value_len); 77 static void add_pax_attr_int(struct archive_string *, 78 const char *key, int64_t value); 79 static void add_pax_attr_time(struct archive_string *, 80 const char *key, int64_t sec, 81 unsigned long nanos); 82 static int add_pax_acl(struct archive_write *, 83 struct archive_entry *, struct pax *, int); 84 static ssize_t archive_write_pax_data(struct archive_write *, 85 const void *, size_t); 86 static int archive_write_pax_close(struct archive_write *); 87 static int archive_write_pax_free(struct archive_write *); 88 static int archive_write_pax_finish_entry(struct archive_write *); 89 static int archive_write_pax_header(struct archive_write *, 90 struct archive_entry *); 91 static int archive_write_pax_options(struct archive_write *, 92 const char *, const char *); 93 static char *base64_encode(const char *src, size_t len); 94 static char *build_gnu_sparse_name(char *dest, const char *src); 95 static char *build_pax_attribute_name(char *dest, const char *src); 96 static char *build_ustar_entry_name(char *dest, const char *src, 97 size_t src_length, const char *insert); 98 static char *format_int(char *dest, int64_t); 99 static int has_non_ASCII(const char *); 100 static void sparse_list_clear(struct pax *); 101 static int sparse_list_add(struct pax *, int64_t, int64_t); 102 static char *url_encode(const char *in); 103 104 /* 105 * Set output format to 'restricted pax' format. 106 * 107 * This is the same as normal 'pax', but tries to suppress 108 * the pax header whenever possible. This is the default for 109 * bsdtar, for instance. 110 */ 111 int 112 archive_write_set_format_pax_restricted(struct archive *_a) 113 { 114 struct archive_write *a = (struct archive_write *)_a; 115 int r; 116 117 archive_check_magic(_a, ARCHIVE_WRITE_MAGIC, 118 ARCHIVE_STATE_NEW, "archive_write_set_format_pax_restricted"); 119 120 r = archive_write_set_format_pax(&a->archive); 121 a->archive.archive_format = ARCHIVE_FORMAT_TAR_PAX_RESTRICTED; 122 a->archive.archive_format_name = "restricted POSIX pax interchange"; 123 return (r); 124 } 125 126 /* 127 * Set output format to 'pax' format. 128 */ 129 int 130 archive_write_set_format_pax(struct archive *_a) 131 { 132 struct archive_write *a = (struct archive_write *)_a; 133 struct pax *pax; 134 135 archive_check_magic(_a, ARCHIVE_WRITE_MAGIC, 136 ARCHIVE_STATE_NEW, "archive_write_set_format_pax"); 137 138 if (a->format_free != NULL) 139 (a->format_free)(a); 140 141 pax = (struct pax *)calloc(1, sizeof(*pax)); 142 if (pax == NULL) { 143 archive_set_error(&a->archive, ENOMEM, 144 "Can't allocate pax data"); 145 return (ARCHIVE_FATAL); 146 } 147 pax->flags = WRITE_LIBARCHIVE_XATTR | WRITE_SCHILY_XATTR; 148 149 a->format_data = pax; 150 a->format_name = "pax"; 151 a->format_options = archive_write_pax_options; 152 a->format_write_header = archive_write_pax_header; 153 a->format_write_data = archive_write_pax_data; 154 a->format_close = archive_write_pax_close; 155 a->format_free = archive_write_pax_free; 156 a->format_finish_entry = archive_write_pax_finish_entry; 157 a->archive.archive_format = ARCHIVE_FORMAT_TAR_PAX_INTERCHANGE; 158 a->archive.archive_format_name = "POSIX pax interchange"; 159 return (ARCHIVE_OK); 160 } 161 162 static int 163 archive_write_pax_options(struct archive_write *a, const char *key, 164 const char *val) 165 { 166 struct pax *pax = (struct pax *)a->format_data; 167 int ret = ARCHIVE_FAILED; 168 169 if (strcmp(key, "hdrcharset") == 0) { 170 /* 171 * The character-set we can use are defined in 172 * IEEE Std 1003.1-2001 173 */ 174 if (val == NULL || val[0] == 0) 175 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 176 "pax: hdrcharset option needs a character-set name"); 177 else if (strcmp(val, "BINARY") == 0 || 178 strcmp(val, "binary") == 0) { 179 /* 180 * Specify binary mode. We will not convert 181 * filenames, uname and gname to any charsets. 182 */ 183 pax->opt_binary = 1; 184 ret = ARCHIVE_OK; 185 } else if (strcmp(val, "UTF-8") == 0) { 186 /* 187 * Specify UTF-8 character-set to be used for 188 * filenames. This is almost the test that 189 * running platform supports the string conversion. 190 * Especially libarchive_test needs this trick for 191 * its test. 192 */ 193 pax->sconv_utf8 = archive_string_conversion_to_charset( 194 &(a->archive), "UTF-8", 0); 195 if (pax->sconv_utf8 == NULL) 196 ret = ARCHIVE_FATAL; 197 else 198 ret = ARCHIVE_OK; 199 } else 200 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 201 "pax: invalid charset name"); 202 return (ret); 203 } else if (strcmp(key, "xattrheader") == 0) { 204 if (val == NULL || val[0] == 0) { 205 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 206 "pax: xattrheader requires a value"); 207 } else if (strcmp(val, "ALL") == 0 || 208 strcmp(val, "all") == 0) { 209 pax->flags |= WRITE_LIBARCHIVE_XATTR | WRITE_SCHILY_XATTR; 210 ret = ARCHIVE_OK; 211 } else if (strcmp(val, "SCHILY") == 0 || 212 strcmp(val, "schily") == 0) { 213 pax->flags |= WRITE_SCHILY_XATTR; 214 pax->flags &= ~WRITE_LIBARCHIVE_XATTR; 215 ret = ARCHIVE_OK; 216 } else if (strcmp(val, "LIBARCHIVE") == 0 || 217 strcmp(val, "libarchive") == 0) { 218 pax->flags |= WRITE_LIBARCHIVE_XATTR; 219 pax->flags &= ~WRITE_SCHILY_XATTR; 220 ret = ARCHIVE_OK; 221 } else 222 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 223 "pax: invalid xattr header name"); 224 return (ret); 225 } 226 227 /* Note: The "warn" return is just to inform the options 228 * supervisor that we didn't handle it. It will generate 229 * a suitable error if no one used this option. */ 230 return (ARCHIVE_WARN); 231 } 232 233 /* 234 * Note: This code assumes that 'nanos' has the same sign as 'sec', 235 * which implies that sec=-1, nanos=200000000 represents -1.2 seconds 236 * and not -0.8 seconds. This is a pretty pedantic point, as we're 237 * unlikely to encounter many real files created before Jan 1, 1970, 238 * much less ones with timestamps recorded to sub-second resolution. 239 */ 240 static void 241 add_pax_attr_time(struct archive_string *as, const char *key, 242 int64_t sec, unsigned long nanos) 243 { 244 int digit, i; 245 char *t; 246 /* 247 * Note that each byte contributes fewer than 3 base-10 248 * digits, so this will always be big enough. 249 */ 250 char tmp[1 + 3*sizeof(sec) + 1 + 3*sizeof(nanos)]; 251 252 tmp[sizeof(tmp) - 1] = 0; 253 t = tmp + sizeof(tmp) - 1; 254 255 /* Skip trailing zeros in the fractional part. */ 256 for (digit = 0, i = 10; i > 0 && digit == 0; i--) { 257 digit = nanos % 10; 258 nanos /= 10; 259 } 260 261 /* Only format the fraction if it's non-zero. */ 262 if (i > 0) { 263 while (i > 0) { 264 *--t = "0123456789"[digit]; 265 digit = nanos % 10; 266 nanos /= 10; 267 i--; 268 } 269 *--t = '.'; 270 } 271 t = format_int(t, sec); 272 273 add_pax_attr(as, key, t); 274 } 275 276 static char * 277 format_int(char *t, int64_t i) 278 { 279 uint64_t ui; 280 281 if (i < 0) 282 ui = (i == INT64_MIN) ? (uint64_t)(INT64_MAX) + 1 : (uint64_t)(-i); 283 else 284 ui = i; 285 286 do { 287 *--t = "0123456789"[ui % 10]; 288 } while (ui /= 10); 289 if (i < 0) 290 *--t = '-'; 291 return (t); 292 } 293 294 static void 295 add_pax_attr_int(struct archive_string *as, const char *key, int64_t value) 296 { 297 char tmp[1 + 3 * sizeof(value)]; 298 299 tmp[sizeof(tmp) - 1] = 0; 300 add_pax_attr(as, key, format_int(tmp + sizeof(tmp) - 1, value)); 301 } 302 303 /* 304 * Add a key/value attribute to the pax header. This function handles 305 * the length field and various other syntactic requirements. 306 */ 307 static void 308 add_pax_attr(struct archive_string *as, const char *key, const char *value) 309 { 310 add_pax_attr_binary(as, key, value, strlen(value)); 311 } 312 313 /* 314 * Add a key/value attribute to the pax header. This function handles 315 * binary values. 316 */ 317 static void 318 add_pax_attr_binary(struct archive_string *as, const char *key, 319 const char *value, size_t value_len) 320 { 321 int digits, i, len, next_ten; 322 char tmp[1 + 3 * sizeof(int)]; /* < 3 base-10 digits per byte */ 323 324 /*- 325 * PAX attributes have the following layout: 326 * <len> <space> <key> <=> <value> <nl> 327 */ 328 len = 1 + (int)strlen(key) + 1 + (int)value_len + 1; 329 330 /* 331 * The <len> field includes the length of the <len> field, so 332 * computing the correct length is tricky. I start by 333 * counting the number of base-10 digits in 'len' and 334 * computing the next higher power of 10. 335 */ 336 next_ten = 1; 337 digits = 0; 338 i = len; 339 while (i > 0) { 340 i = i / 10; 341 digits++; 342 next_ten = next_ten * 10; 343 } 344 /* 345 * For example, if string without the length field is 99 346 * chars, then adding the 2 digit length "99" will force the 347 * total length past 100, requiring an extra digit. The next 348 * statement adjusts for this effect. 349 */ 350 if (len + digits >= next_ten) 351 digits++; 352 353 /* Now, we have the right length so we can build the line. */ 354 tmp[sizeof(tmp) - 1] = 0; /* Null-terminate the work area. */ 355 archive_strcat(as, format_int(tmp + sizeof(tmp) - 1, len + digits)); 356 archive_strappend_char(as, ' '); 357 archive_strcat(as, key); 358 archive_strappend_char(as, '='); 359 archive_array_append(as, value, value_len); 360 archive_strappend_char(as, '\n'); 361 } 362 363 static void 364 archive_write_pax_header_xattr(struct pax *pax, const char *encoded_name, 365 const void *value, size_t value_len) 366 { 367 struct archive_string s; 368 char *encoded_value; 369 370 if (pax->flags & WRITE_LIBARCHIVE_XATTR) { 371 encoded_value = base64_encode((const char *)value, value_len); 372 373 if (encoded_name != NULL && encoded_value != NULL) { 374 archive_string_init(&s); 375 archive_strcpy(&s, "LIBARCHIVE.xattr."); 376 archive_strcat(&s, encoded_name); 377 add_pax_attr(&(pax->pax_header), s.s, encoded_value); 378 archive_string_free(&s); 379 } 380 free(encoded_value); 381 } 382 if (pax->flags & WRITE_SCHILY_XATTR) { 383 archive_string_init(&s); 384 archive_strcpy(&s, "SCHILY.xattr."); 385 archive_strcat(&s, encoded_name); 386 add_pax_attr_binary(&(pax->pax_header), s.s, value, value_len); 387 archive_string_free(&s); 388 } 389 } 390 391 static int 392 archive_write_pax_header_xattrs(struct archive_write *a, 393 struct pax *pax, struct archive_entry *entry) 394 { 395 int i = archive_entry_xattr_reset(entry); 396 397 while (i--) { 398 const char *name; 399 const void *value; 400 char *url_encoded_name = NULL, *encoded_name = NULL; 401 size_t size; 402 int r; 403 404 archive_entry_xattr_next(entry, &name, &value, &size); 405 url_encoded_name = url_encode(name); 406 if (url_encoded_name != NULL) { 407 /* Convert narrow-character to UTF-8. */ 408 r = archive_strcpy_l(&(pax->l_url_encoded_name), 409 url_encoded_name, pax->sconv_utf8); 410 free(url_encoded_name); /* Done with this. */ 411 if (r == 0) 412 encoded_name = pax->l_url_encoded_name.s; 413 else if (errno == ENOMEM) { 414 archive_set_error(&a->archive, ENOMEM, 415 "Can't allocate memory for Linkname"); 416 return (ARCHIVE_FATAL); 417 } 418 } 419 420 archive_write_pax_header_xattr(pax, encoded_name, 421 value, size); 422 423 } 424 return (ARCHIVE_OK); 425 } 426 427 static int 428 get_entry_hardlink(struct archive_write *a, struct archive_entry *entry, 429 const char **name, size_t *length, struct archive_string_conv *sc) 430 { 431 int r; 432 433 r = archive_entry_hardlink_l(entry, name, length, sc); 434 if (r != 0) { 435 if (errno == ENOMEM) { 436 archive_set_error(&a->archive, ENOMEM, 437 "Can't allocate memory for Linkname"); 438 return (ARCHIVE_FATAL); 439 } 440 return (ARCHIVE_WARN); 441 } 442 return (ARCHIVE_OK); 443 } 444 445 static int 446 get_entry_pathname(struct archive_write *a, struct archive_entry *entry, 447 const char **name, size_t *length, struct archive_string_conv *sc) 448 { 449 int r; 450 451 r = archive_entry_pathname_l(entry, name, length, sc); 452 if (r != 0) { 453 if (errno == ENOMEM) { 454 archive_set_error(&a->archive, ENOMEM, 455 "Can't allocate memory for Pathname"); 456 return (ARCHIVE_FATAL); 457 } 458 return (ARCHIVE_WARN); 459 } 460 return (ARCHIVE_OK); 461 } 462 463 static int 464 get_entry_uname(struct archive_write *a, struct archive_entry *entry, 465 const char **name, size_t *length, struct archive_string_conv *sc) 466 { 467 int r; 468 469 r = archive_entry_uname_l(entry, name, length, sc); 470 if (r != 0) { 471 if (errno == ENOMEM) { 472 archive_set_error(&a->archive, ENOMEM, 473 "Can't allocate memory for Uname"); 474 return (ARCHIVE_FATAL); 475 } 476 return (ARCHIVE_WARN); 477 } 478 return (ARCHIVE_OK); 479 } 480 481 static int 482 get_entry_gname(struct archive_write *a, struct archive_entry *entry, 483 const char **name, size_t *length, struct archive_string_conv *sc) 484 { 485 int r; 486 487 r = archive_entry_gname_l(entry, name, length, sc); 488 if (r != 0) { 489 if (errno == ENOMEM) { 490 archive_set_error(&a->archive, ENOMEM, 491 "Can't allocate memory for Gname"); 492 return (ARCHIVE_FATAL); 493 } 494 return (ARCHIVE_WARN); 495 } 496 return (ARCHIVE_OK); 497 } 498 499 static int 500 get_entry_symlink(struct archive_write *a, struct archive_entry *entry, 501 const char **name, size_t *length, struct archive_string_conv *sc) 502 { 503 int r; 504 505 r = archive_entry_symlink_l(entry, name, length, sc); 506 if (r != 0) { 507 if (errno == ENOMEM) { 508 archive_set_error(&a->archive, ENOMEM, 509 "Can't allocate memory for Linkname"); 510 return (ARCHIVE_FATAL); 511 } 512 return (ARCHIVE_WARN); 513 } 514 return (ARCHIVE_OK); 515 } 516 517 /* Add ACL to pax header */ 518 static int 519 add_pax_acl(struct archive_write *a, 520 struct archive_entry *entry, struct pax *pax, int flags) 521 { 522 char *p; 523 const char *attr; 524 int acl_types; 525 526 acl_types = archive_entry_acl_types(entry); 527 528 if ((acl_types & ARCHIVE_ENTRY_ACL_TYPE_NFS4) != 0) 529 attr = "SCHILY.acl.ace"; 530 else if ((flags & ARCHIVE_ENTRY_ACL_TYPE_ACCESS) != 0) 531 attr = "SCHILY.acl.access"; 532 else if ((flags & ARCHIVE_ENTRY_ACL_TYPE_DEFAULT) != 0) 533 attr = "SCHILY.acl.default"; 534 else 535 return (ARCHIVE_FATAL); 536 537 p = archive_entry_acl_to_text_l(entry, NULL, flags, pax->sconv_utf8); 538 if (p == NULL) { 539 if (errno == ENOMEM) { 540 archive_set_error(&a->archive, ENOMEM, "%s %s", 541 "Can't allocate memory for ", attr); 542 return (ARCHIVE_FATAL); 543 } 544 archive_set_error(&a->archive, 545 ARCHIVE_ERRNO_FILE_FORMAT, "%s %s %s", 546 "Can't translate ", attr, " to UTF-8"); 547 return(ARCHIVE_WARN); 548 } 549 550 if (*p != '\0') { 551 add_pax_attr(&(pax->pax_header), 552 attr, p); 553 } 554 free(p); 555 return(ARCHIVE_OK); 556 } 557 558 /* 559 * TODO: Consider adding 'comment' and 'charset' fields to 560 * archive_entry so that clients can specify them. Also, consider 561 * adding generic key/value tags so clients can add arbitrary 562 * key/value data. 563 * 564 * TODO: Break up this 700-line function!!!! Yowza! 565 */ 566 static int 567 archive_write_pax_header(struct archive_write *a, 568 struct archive_entry *entry_original) 569 { 570 struct archive_entry *entry_main; 571 const char *p; 572 const char *suffix; 573 int need_extension, r, ret; 574 int acl_types; 575 int sparse_count; 576 uint64_t sparse_total, real_size; 577 struct pax *pax; 578 const char *hardlink; 579 const char *path = NULL, *linkpath = NULL; 580 const char *uname = NULL, *gname = NULL; 581 const void *mac_metadata; 582 size_t mac_metadata_size; 583 struct archive_string_conv *sconv; 584 size_t hardlink_length, path_length, linkpath_length; 585 size_t uname_length, gname_length; 586 587 char paxbuff[512]; 588 char ustarbuff[512]; 589 char ustar_entry_name[256]; 590 char pax_entry_name[256]; 591 char gnu_sparse_name[256]; 592 struct archive_string entry_name; 593 594 ret = ARCHIVE_OK; 595 need_extension = 0; 596 pax = (struct pax *)a->format_data; 597 598 /* Sanity check. */ 599 if (archive_entry_pathname(entry_original) == NULL) { 600 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 601 "Can't record entry in tar file without pathname"); 602 return (ARCHIVE_FAILED); 603 } 604 605 /* 606 * Choose a header encoding. 607 */ 608 if (pax->opt_binary) 609 sconv = NULL;/* Binary mode. */ 610 else { 611 /* Header encoding is UTF-8. */ 612 if (pax->sconv_utf8 == NULL) { 613 /* Initialize the string conversion object 614 * we must need */ 615 pax->sconv_utf8 = archive_string_conversion_to_charset( 616 &(a->archive), "UTF-8", 1); 617 if (pax->sconv_utf8 == NULL) 618 /* Couldn't allocate memory */ 619 return (ARCHIVE_FAILED); 620 } 621 sconv = pax->sconv_utf8; 622 } 623 624 r = get_entry_hardlink(a, entry_original, &hardlink, 625 &hardlink_length, sconv); 626 if (r == ARCHIVE_FATAL) 627 return (r); 628 else if (r != ARCHIVE_OK) { 629 r = get_entry_hardlink(a, entry_original, &hardlink, 630 &hardlink_length, NULL); 631 if (r == ARCHIVE_FATAL) 632 return (r); 633 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 634 "Can't translate linkname '%s' to %s", hardlink, 635 archive_string_conversion_charset_name(sconv)); 636 ret = ARCHIVE_WARN; 637 sconv = NULL;/* The header charset switches to binary mode. */ 638 } 639 640 /* Make sure this is a type of entry that we can handle here */ 641 if (hardlink == NULL) { 642 switch (archive_entry_filetype(entry_original)) { 643 case AE_IFBLK: 644 case AE_IFCHR: 645 case AE_IFIFO: 646 case AE_IFLNK: 647 case AE_IFREG: 648 break; 649 case AE_IFDIR: 650 { 651 /* 652 * Ensure a trailing '/'. Modify the original 653 * entry so the client sees the change. 654 */ 655 #if defined(_WIN32) && !defined(__CYGWIN__) 656 const wchar_t *wp; 657 658 wp = archive_entry_pathname_w(entry_original); 659 if (wp != NULL && wp[wcslen(wp) -1] != L'/') { 660 struct archive_wstring ws; 661 662 archive_string_init(&ws); 663 path_length = wcslen(wp); 664 if (archive_wstring_ensure(&ws, 665 path_length + 2) == NULL) { 666 archive_set_error(&a->archive, ENOMEM, 667 "Can't allocate pax data"); 668 archive_wstring_free(&ws); 669 return(ARCHIVE_FATAL); 670 } 671 /* Should we keep '\' ? */ 672 if (wp[path_length -1] == L'\\') 673 path_length--; 674 archive_wstrncpy(&ws, wp, path_length); 675 archive_wstrappend_wchar(&ws, L'/'); 676 archive_entry_copy_pathname_w( 677 entry_original, ws.s); 678 archive_wstring_free(&ws); 679 p = NULL; 680 } else 681 #endif 682 p = archive_entry_pathname(entry_original); 683 /* 684 * On Windows, this is a backup operation just in 685 * case getting WCS failed. On POSIX, this is a 686 * normal operation. 687 */ 688 if (p != NULL && p[0] != '\0' && p[strlen(p) - 1] != '/') { 689 struct archive_string as; 690 691 archive_string_init(&as); 692 path_length = strlen(p); 693 if (archive_string_ensure(&as, 694 path_length + 2) == NULL) { 695 archive_set_error(&a->archive, ENOMEM, 696 "Can't allocate pax data"); 697 archive_string_free(&as); 698 return(ARCHIVE_FATAL); 699 } 700 #if defined(_WIN32) && !defined(__CYGWIN__) 701 /* NOTE: This might break the pathname 702 * if the current code page is CP932 and 703 * the pathname includes a character '\' 704 * as a part of its multibyte pathname. */ 705 if (p[strlen(p) -1] == '\\') 706 path_length--; 707 else 708 #endif 709 archive_strncpy(&as, p, path_length); 710 archive_strappend_char(&as, '/'); 711 archive_entry_copy_pathname( 712 entry_original, as.s); 713 archive_string_free(&as); 714 } 715 break; 716 } 717 default: /* AE_IFSOCK and unknown */ 718 __archive_write_entry_filetype_unsupported( 719 &a->archive, entry_original, "pax"); 720 return (ARCHIVE_FAILED); 721 } 722 } 723 724 /* 725 * If Mac OS metadata blob is here, recurse to write that 726 * as a separate entry. This is really a pretty poor design: 727 * In particular, it doubles the overhead for long filenames. 728 * TODO: Help Apple folks design something better and figure 729 * out how to transition from this legacy format. 730 * 731 * Note that this code is present on every platform; clients 732 * on non-Mac are unlikely to ever provide this data, but 733 * applications that copy entries from one archive to another 734 * should not lose data just because the local filesystem 735 * can't store it. 736 */ 737 mac_metadata = 738 archive_entry_mac_metadata(entry_original, &mac_metadata_size); 739 if (mac_metadata != NULL) { 740 const char *oname; 741 char *name, *bname; 742 size_t name_length; 743 struct archive_entry *extra = archive_entry_new2(&a->archive); 744 745 oname = archive_entry_pathname(entry_original); 746 name_length = strlen(oname); 747 name = malloc(name_length + 3); 748 if (name == NULL || extra == NULL) { 749 /* XXX error message */ 750 archive_entry_free(extra); 751 free(name); 752 return (ARCHIVE_FAILED); 753 } 754 strcpy(name, oname); 755 /* Find last '/'; strip trailing '/' characters */ 756 bname = strrchr(name, '/'); 757 while (bname != NULL && bname[1] == '\0') { 758 *bname = '\0'; 759 bname = strrchr(name, '/'); 760 } 761 if (bname == NULL) { 762 memmove(name + 2, name, name_length + 1); 763 memmove(name, "._", 2); 764 } else { 765 bname += 1; 766 memmove(bname + 2, bname, strlen(bname) + 1); 767 memmove(bname, "._", 2); 768 } 769 archive_entry_copy_pathname(extra, name); 770 free(name); 771 772 archive_entry_set_size(extra, mac_metadata_size); 773 archive_entry_set_filetype(extra, AE_IFREG); 774 archive_entry_set_perm(extra, 775 archive_entry_perm(entry_original)); 776 archive_entry_set_mtime(extra, 777 archive_entry_mtime(entry_original), 778 archive_entry_mtime_nsec(entry_original)); 779 archive_entry_set_gid(extra, 780 archive_entry_gid(entry_original)); 781 archive_entry_set_gname(extra, 782 archive_entry_gname(entry_original)); 783 archive_entry_set_uid(extra, 784 archive_entry_uid(entry_original)); 785 archive_entry_set_uname(extra, 786 archive_entry_uname(entry_original)); 787 788 /* Recurse to write the special copyfile entry. */ 789 r = archive_write_pax_header(a, extra); 790 archive_entry_free(extra); 791 if (r < ARCHIVE_WARN) 792 return (r); 793 if (r < ret) 794 ret = r; 795 r = (int)archive_write_pax_data(a, mac_metadata, 796 mac_metadata_size); 797 if (r < ARCHIVE_WARN) 798 return (r); 799 if (r < ret) 800 ret = r; 801 r = archive_write_pax_finish_entry(a); 802 if (r < ARCHIVE_WARN) 803 return (r); 804 if (r < ret) 805 ret = r; 806 } 807 808 /* Copy entry so we can modify it as needed. */ 809 #if defined(_WIN32) && !defined(__CYGWIN__) 810 /* Make sure the path separators in pathname, hardlink and symlink 811 * are all slash '/', not the Windows path separator '\'. */ 812 entry_main = __la_win_entry_in_posix_pathseparator(entry_original); 813 if (entry_main == entry_original) 814 entry_main = archive_entry_clone(entry_original); 815 #else 816 entry_main = archive_entry_clone(entry_original); 817 #endif 818 if (entry_main == NULL) { 819 archive_set_error(&a->archive, ENOMEM, 820 "Can't allocate pax data"); 821 return(ARCHIVE_FATAL); 822 } 823 archive_string_empty(&(pax->pax_header)); /* Blank our work area. */ 824 archive_string_empty(&(pax->sparse_map)); 825 sparse_total = 0; 826 sparse_list_clear(pax); 827 828 if (hardlink == NULL && 829 archive_entry_filetype(entry_main) == AE_IFREG) 830 sparse_count = archive_entry_sparse_reset(entry_main); 831 else 832 sparse_count = 0; 833 if (sparse_count) { 834 int64_t offset, length, last_offset = 0; 835 /* Get the last entry of sparse block. */ 836 while (archive_entry_sparse_next( 837 entry_main, &offset, &length) == ARCHIVE_OK) 838 last_offset = offset + length; 839 840 /* If the last sparse block does not reach the end of file, 841 * We have to add a empty sparse block as the last entry to 842 * manage storing file data. */ 843 if (last_offset < archive_entry_size(entry_main)) 844 archive_entry_sparse_add_entry(entry_main, 845 archive_entry_size(entry_main), 0); 846 sparse_count = archive_entry_sparse_reset(entry_main); 847 } 848 849 /* 850 * First, check the name fields and see if any of them 851 * require binary coding. If any of them does, then all of 852 * them do. 853 */ 854 r = get_entry_pathname(a, entry_main, &path, &path_length, sconv); 855 if (r == ARCHIVE_FATAL) { 856 archive_entry_free(entry_main); 857 return (r); 858 } else if (r != ARCHIVE_OK) { 859 r = get_entry_pathname(a, entry_main, &path, 860 &path_length, NULL); 861 if (r == ARCHIVE_FATAL) { 862 archive_entry_free(entry_main); 863 return (r); 864 } 865 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 866 "Can't translate pathname '%s' to %s", path, 867 archive_string_conversion_charset_name(sconv)); 868 ret = ARCHIVE_WARN; 869 sconv = NULL;/* The header charset switches to binary mode. */ 870 } 871 r = get_entry_uname(a, entry_main, &uname, &uname_length, sconv); 872 if (r == ARCHIVE_FATAL) { 873 archive_entry_free(entry_main); 874 return (r); 875 } else if (r != ARCHIVE_OK) { 876 r = get_entry_uname(a, entry_main, &uname, &uname_length, NULL); 877 if (r == ARCHIVE_FATAL) { 878 archive_entry_free(entry_main); 879 return (r); 880 } 881 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 882 "Can't translate uname '%s' to %s", uname, 883 archive_string_conversion_charset_name(sconv)); 884 ret = ARCHIVE_WARN; 885 sconv = NULL;/* The header charset switches to binary mode. */ 886 } 887 r = get_entry_gname(a, entry_main, &gname, &gname_length, sconv); 888 if (r == ARCHIVE_FATAL) { 889 archive_entry_free(entry_main); 890 return (r); 891 } else if (r != ARCHIVE_OK) { 892 r = get_entry_gname(a, entry_main, &gname, &gname_length, NULL); 893 if (r == ARCHIVE_FATAL) { 894 archive_entry_free(entry_main); 895 return (r); 896 } 897 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 898 "Can't translate gname '%s' to %s", gname, 899 archive_string_conversion_charset_name(sconv)); 900 ret = ARCHIVE_WARN; 901 sconv = NULL;/* The header charset switches to binary mode. */ 902 } 903 linkpath = hardlink; 904 linkpath_length = hardlink_length; 905 if (linkpath == NULL) { 906 r = get_entry_symlink(a, entry_main, &linkpath, 907 &linkpath_length, sconv); 908 if (r == ARCHIVE_FATAL) { 909 archive_entry_free(entry_main); 910 return (r); 911 } else if (r != ARCHIVE_OK) { 912 r = get_entry_symlink(a, entry_main, &linkpath, 913 &linkpath_length, NULL); 914 if (r == ARCHIVE_FATAL) { 915 archive_entry_free(entry_main); 916 return (r); 917 } 918 archive_set_error(&a->archive, 919 ARCHIVE_ERRNO_FILE_FORMAT, 920 "Can't translate linkname '%s' to %s", linkpath, 921 archive_string_conversion_charset_name(sconv)); 922 ret = ARCHIVE_WARN; 923 sconv = NULL; 924 } 925 } 926 927 /* If any string conversions failed, get all attributes 928 * in binary-mode. */ 929 if (sconv == NULL && !pax->opt_binary) { 930 if (hardlink != NULL) { 931 r = get_entry_hardlink(a, entry_main, &hardlink, 932 &hardlink_length, NULL); 933 if (r == ARCHIVE_FATAL) { 934 archive_entry_free(entry_main); 935 return (r); 936 } 937 linkpath = hardlink; 938 linkpath_length = hardlink_length; 939 } 940 r = get_entry_pathname(a, entry_main, &path, 941 &path_length, NULL); 942 if (r == ARCHIVE_FATAL) { 943 archive_entry_free(entry_main); 944 return (r); 945 } 946 r = get_entry_uname(a, entry_main, &uname, &uname_length, NULL); 947 if (r == ARCHIVE_FATAL) { 948 archive_entry_free(entry_main); 949 return (r); 950 } 951 r = get_entry_gname(a, entry_main, &gname, &gname_length, NULL); 952 if (r == ARCHIVE_FATAL) { 953 archive_entry_free(entry_main); 954 return (r); 955 } 956 } 957 958 /* Store the header encoding first, to be nice to readers. */ 959 if (sconv == NULL) 960 add_pax_attr(&(pax->pax_header), "hdrcharset", "BINARY"); 961 962 963 /* 964 * If name is too long, or has non-ASCII characters, add 965 * 'path' to pax extended attrs. (Note that an unconvertible 966 * name must have non-ASCII characters.) 967 */ 968 if (has_non_ASCII(path)) { 969 /* We have non-ASCII characters. */ 970 add_pax_attr(&(pax->pax_header), "path", path); 971 archive_entry_set_pathname(entry_main, 972 build_ustar_entry_name(ustar_entry_name, 973 path, path_length, NULL)); 974 need_extension = 1; 975 } else { 976 /* We have an all-ASCII path; we'd like to just store 977 * it in the ustar header if it will fit. Yes, this 978 * duplicates some of the logic in 979 * archive_write_set_format_ustar.c 980 */ 981 if (path_length <= 100) { 982 /* Fits in the old 100-char tar name field. */ 983 } else { 984 /* Find largest suffix that will fit. */ 985 /* Note: strlen() > 100, so strlen() - 100 - 1 >= 0 */ 986 suffix = strchr(path + path_length - 100 - 1, '/'); 987 /* Don't attempt an empty prefix. */ 988 if (suffix == path) 989 suffix = strchr(suffix + 1, '/'); 990 /* We can put it in the ustar header if it's 991 * all ASCII and it's either <= 100 characters 992 * or can be split at a '/' into a prefix <= 993 * 155 chars and a suffix <= 100 chars. (Note 994 * the strchr() above will return NULL exactly 995 * when the path can't be split.) 996 */ 997 if (suffix == NULL /* Suffix > 100 chars. */ 998 || suffix[1] == '\0' /* empty suffix */ 999 || suffix - path > 155) /* Prefix > 155 chars */ 1000 { 1001 add_pax_attr(&(pax->pax_header), "path", path); 1002 archive_entry_set_pathname(entry_main, 1003 build_ustar_entry_name(ustar_entry_name, 1004 path, path_length, NULL)); 1005 need_extension = 1; 1006 } 1007 } 1008 } 1009 1010 if (linkpath != NULL) { 1011 /* If link name is too long or has non-ASCII characters, add 1012 * 'linkpath' to pax extended attrs. */ 1013 if (linkpath_length > 100 || has_non_ASCII(linkpath)) { 1014 add_pax_attr(&(pax->pax_header), "linkpath", linkpath); 1015 if (linkpath_length > 100) { 1016 if (hardlink != NULL) 1017 archive_entry_set_hardlink(entry_main, 1018 "././@LongHardLink"); 1019 else 1020 archive_entry_set_symlink(entry_main, 1021 "././@LongSymLink"); 1022 } 1023 need_extension = 1; 1024 } 1025 } 1026 /* Save a pathname since it will be renamed if `entry_main` has 1027 * sparse blocks. */ 1028 archive_string_init(&entry_name); 1029 archive_strcpy(&entry_name, archive_entry_pathname(entry_main)); 1030 1031 /* If file size is too large, we need pax extended attrs. */ 1032 if (archive_entry_size(entry_main) >= (((int64_t)1) << 33)) { 1033 need_extension = 1; 1034 } 1035 1036 /* If numeric GID is too large, add 'gid' to pax extended attrs. */ 1037 if ((unsigned int)archive_entry_gid(entry_main) >= (1 << 18)) { 1038 add_pax_attr_int(&(pax->pax_header), "gid", 1039 archive_entry_gid(entry_main)); 1040 need_extension = 1; 1041 } 1042 1043 /* If group name is too large or has non-ASCII characters, add 1044 * 'gname' to pax extended attrs. */ 1045 if (gname != NULL) { 1046 if (gname_length > 31 || has_non_ASCII(gname)) { 1047 add_pax_attr(&(pax->pax_header), "gname", gname); 1048 need_extension = 1; 1049 } 1050 } 1051 1052 /* If numeric UID is too large, add 'uid' to pax extended attrs. */ 1053 if ((unsigned int)archive_entry_uid(entry_main) >= (1 << 18)) { 1054 add_pax_attr_int(&(pax->pax_header), "uid", 1055 archive_entry_uid(entry_main)); 1056 need_extension = 1; 1057 } 1058 1059 /* Add 'uname' to pax extended attrs if necessary. */ 1060 if (uname != NULL) { 1061 if (uname_length > 31 || has_non_ASCII(uname)) { 1062 add_pax_attr(&(pax->pax_header), "uname", uname); 1063 need_extension = 1; 1064 } 1065 } 1066 1067 /* 1068 * POSIX/SUSv3 doesn't provide a standard key for large device 1069 * numbers. I use the same keys here that Joerg Schilling 1070 * used for 'star.' (Which, somewhat confusingly, are called 1071 * "devXXX" even though they code "rdev" values.) No doubt, 1072 * other implementations use other keys. Note that there's no 1073 * reason we can't write the same information into a number of 1074 * different keys. 1075 * 1076 * Of course, this is only needed for block or char device entries. 1077 */ 1078 if (archive_entry_filetype(entry_main) == AE_IFBLK 1079 || archive_entry_filetype(entry_main) == AE_IFCHR) { 1080 /* 1081 * If rdevmajor is too large, add 'SCHILY.devmajor' to 1082 * extended attributes. 1083 */ 1084 int rdevmajor, rdevminor; 1085 rdevmajor = archive_entry_rdevmajor(entry_main); 1086 rdevminor = archive_entry_rdevminor(entry_main); 1087 if (rdevmajor >= (1 << 18)) { 1088 add_pax_attr_int(&(pax->pax_header), "SCHILY.devmajor", 1089 rdevmajor); 1090 /* 1091 * Non-strict formatting below means we don't 1092 * have to truncate here. Not truncating improves 1093 * the chance that some more modern tar archivers 1094 * (such as GNU tar 1.13) can restore the full 1095 * value even if they don't understand the pax 1096 * extended attributes. See my rant below about 1097 * file size fields for additional details. 1098 */ 1099 /* archive_entry_set_rdevmajor(entry_main, 1100 rdevmajor & ((1 << 18) - 1)); */ 1101 need_extension = 1; 1102 } 1103 1104 /* 1105 * If devminor is too large, add 'SCHILY.devminor' to 1106 * extended attributes. 1107 */ 1108 if (rdevminor >= (1 << 18)) { 1109 add_pax_attr_int(&(pax->pax_header), "SCHILY.devminor", 1110 rdevminor); 1111 /* Truncation is not necessary here, either. */ 1112 /* archive_entry_set_rdevminor(entry_main, 1113 rdevminor & ((1 << 18) - 1)); */ 1114 need_extension = 1; 1115 } 1116 } 1117 1118 /* 1119 * Technically, the mtime field in the ustar header can 1120 * support 33 bits, but many platforms use signed 32-bit time 1121 * values. The cutoff of 0x7fffffff here is a compromise. 1122 * Yes, this check is duplicated just below; this helps to 1123 * avoid writing an mtime attribute just to handle a 1124 * high-resolution timestamp in "restricted pax" mode. 1125 */ 1126 if (!need_extension && 1127 ((archive_entry_mtime(entry_main) < 0) 1128 || (archive_entry_mtime(entry_main) >= 0x7fffffff))) 1129 need_extension = 1; 1130 1131 /* I use a star-compatible file flag attribute. */ 1132 p = archive_entry_fflags_text(entry_main); 1133 if (!need_extension && p != NULL && *p != '\0') 1134 need_extension = 1; 1135 1136 /* If there are extended attributes, we need an extension */ 1137 if (!need_extension && archive_entry_xattr_count(entry_original) > 0) 1138 need_extension = 1; 1139 1140 /* If there are sparse info, we need an extension */ 1141 if (!need_extension && sparse_count > 0) 1142 need_extension = 1; 1143 1144 acl_types = archive_entry_acl_types(entry_original); 1145 1146 /* If there are any ACL entries, we need an extension */ 1147 if (!need_extension && acl_types != 0) 1148 need_extension = 1; 1149 1150 /* If the symlink type is defined, we need an extension */ 1151 if (!need_extension && archive_entry_symlink_type(entry_main) > 0) 1152 need_extension = 1; 1153 1154 /* 1155 * Libarchive used to include these in extended headers for 1156 * restricted pax format, but that confused people who 1157 * expected ustar-like time semantics. So now we only include 1158 * them in full pax format. 1159 */ 1160 if (a->archive.archive_format != ARCHIVE_FORMAT_TAR_PAX_RESTRICTED) { 1161 if (archive_entry_ctime(entry_main) != 0 || 1162 archive_entry_ctime_nsec(entry_main) != 0) 1163 add_pax_attr_time(&(pax->pax_header), "ctime", 1164 archive_entry_ctime(entry_main), 1165 archive_entry_ctime_nsec(entry_main)); 1166 1167 if (archive_entry_atime(entry_main) != 0 || 1168 archive_entry_atime_nsec(entry_main) != 0) 1169 add_pax_attr_time(&(pax->pax_header), "atime", 1170 archive_entry_atime(entry_main), 1171 archive_entry_atime_nsec(entry_main)); 1172 1173 /* Store birth/creationtime only if it's earlier than mtime */ 1174 if (archive_entry_birthtime_is_set(entry_main) && 1175 archive_entry_birthtime(entry_main) 1176 < archive_entry_mtime(entry_main)) 1177 add_pax_attr_time(&(pax->pax_header), 1178 "LIBARCHIVE.creationtime", 1179 archive_entry_birthtime(entry_main), 1180 archive_entry_birthtime_nsec(entry_main)); 1181 } 1182 1183 /* 1184 * The following items are handled differently in "pax 1185 * restricted" format. In particular, in "pax restricted" 1186 * format they won't be added unless need_extension is 1187 * already set (we're already generating an extended header, so 1188 * may as well include these). 1189 */ 1190 if (a->archive.archive_format != ARCHIVE_FORMAT_TAR_PAX_RESTRICTED || 1191 need_extension) { 1192 if (archive_entry_mtime(entry_main) < 0 || 1193 archive_entry_mtime(entry_main) >= 0x7fffffff || 1194 archive_entry_mtime_nsec(entry_main) != 0) 1195 add_pax_attr_time(&(pax->pax_header), "mtime", 1196 archive_entry_mtime(entry_main), 1197 archive_entry_mtime_nsec(entry_main)); 1198 1199 /* I use a star-compatible file flag attribute. */ 1200 p = archive_entry_fflags_text(entry_main); 1201 if (p != NULL && *p != '\0') 1202 add_pax_attr(&(pax->pax_header), "SCHILY.fflags", p); 1203 1204 /* I use star-compatible ACL attributes. */ 1205 if ((acl_types & ARCHIVE_ENTRY_ACL_TYPE_NFS4) != 0) { 1206 ret = add_pax_acl(a, entry_original, pax, 1207 ARCHIVE_ENTRY_ACL_STYLE_EXTRA_ID | 1208 ARCHIVE_ENTRY_ACL_STYLE_SEPARATOR_COMMA | 1209 ARCHIVE_ENTRY_ACL_STYLE_COMPACT); 1210 if (ret == ARCHIVE_FATAL) { 1211 archive_entry_free(entry_main); 1212 archive_string_free(&entry_name); 1213 return (ARCHIVE_FATAL); 1214 } 1215 } 1216 if (acl_types & ARCHIVE_ENTRY_ACL_TYPE_ACCESS) { 1217 ret = add_pax_acl(a, entry_original, pax, 1218 ARCHIVE_ENTRY_ACL_TYPE_ACCESS | 1219 ARCHIVE_ENTRY_ACL_STYLE_EXTRA_ID | 1220 ARCHIVE_ENTRY_ACL_STYLE_SEPARATOR_COMMA); 1221 if (ret == ARCHIVE_FATAL) { 1222 archive_entry_free(entry_main); 1223 archive_string_free(&entry_name); 1224 return (ARCHIVE_FATAL); 1225 } 1226 } 1227 if (acl_types & ARCHIVE_ENTRY_ACL_TYPE_DEFAULT) { 1228 ret = add_pax_acl(a, entry_original, pax, 1229 ARCHIVE_ENTRY_ACL_TYPE_DEFAULT | 1230 ARCHIVE_ENTRY_ACL_STYLE_EXTRA_ID | 1231 ARCHIVE_ENTRY_ACL_STYLE_SEPARATOR_COMMA); 1232 if (ret == ARCHIVE_FATAL) { 1233 archive_entry_free(entry_main); 1234 archive_string_free(&entry_name); 1235 return (ARCHIVE_FATAL); 1236 } 1237 } 1238 1239 /* We use GNU-tar-compatible sparse attributes. */ 1240 if (sparse_count > 0) { 1241 int64_t soffset, slength; 1242 1243 add_pax_attr_int(&(pax->pax_header), 1244 "GNU.sparse.major", 1); 1245 add_pax_attr_int(&(pax->pax_header), 1246 "GNU.sparse.minor", 0); 1247 /* 1248 * Make sure to store the original path, since 1249 * truncation to ustar limit happened already. 1250 */ 1251 add_pax_attr(&(pax->pax_header), 1252 "GNU.sparse.name", path); 1253 add_pax_attr_int(&(pax->pax_header), 1254 "GNU.sparse.realsize", 1255 archive_entry_size(entry_main)); 1256 1257 /* Rename the file name which will be used for 1258 * ustar header to a special name, which GNU 1259 * PAX Format 1.0 requires */ 1260 archive_entry_set_pathname(entry_main, 1261 build_gnu_sparse_name(gnu_sparse_name, 1262 entry_name.s)); 1263 1264 /* 1265 * - Make a sparse map, which will precede a file data. 1266 * - Get the total size of available data of sparse. 1267 */ 1268 archive_string_sprintf(&(pax->sparse_map), "%d\n", 1269 sparse_count); 1270 while (archive_entry_sparse_next(entry_main, 1271 &soffset, &slength) == ARCHIVE_OK) { 1272 archive_string_sprintf(&(pax->sparse_map), 1273 "%jd\n%jd\n", 1274 (intmax_t)soffset, 1275 (intmax_t)slength); 1276 sparse_total += slength; 1277 if (sparse_list_add(pax, soffset, slength) 1278 != ARCHIVE_OK) { 1279 archive_set_error(&a->archive, 1280 ENOMEM, 1281 "Can't allocate memory"); 1282 archive_entry_free(entry_main); 1283 archive_string_free(&entry_name); 1284 return (ARCHIVE_FATAL); 1285 } 1286 } 1287 } 1288 1289 /* Store extended attributes */ 1290 if (archive_write_pax_header_xattrs(a, pax, entry_original) 1291 == ARCHIVE_FATAL) { 1292 archive_entry_free(entry_main); 1293 archive_string_free(&entry_name); 1294 return (ARCHIVE_FATAL); 1295 } 1296 1297 /* Store extended symlink information */ 1298 if (archive_entry_symlink_type(entry_main) == 1299 AE_SYMLINK_TYPE_FILE) { 1300 add_pax_attr(&(pax->pax_header), 1301 "LIBARCHIVE.symlinktype", "file"); 1302 } else if (archive_entry_symlink_type(entry_main) == 1303 AE_SYMLINK_TYPE_DIRECTORY) { 1304 add_pax_attr(&(pax->pax_header), 1305 "LIBARCHIVE.symlinktype", "dir"); 1306 } 1307 } 1308 1309 /* Only regular files have data. */ 1310 if (archive_entry_filetype(entry_main) != AE_IFREG) 1311 archive_entry_set_size(entry_main, 0); 1312 1313 /* 1314 * Pax-restricted does not store data for hardlinks, in order 1315 * to improve compatibility with ustar. 1316 */ 1317 if (a->archive.archive_format != ARCHIVE_FORMAT_TAR_PAX_INTERCHANGE && 1318 hardlink != NULL) 1319 archive_entry_set_size(entry_main, 0); 1320 1321 /* 1322 * XXX Full pax interchange format does permit a hardlink 1323 * entry to have data associated with it. I'm not supporting 1324 * that here because the client expects me to tell them whether 1325 * or not this format expects data for hardlinks. If I 1326 * don't check here, then every pax archive will end up with 1327 * duplicated data for hardlinks. Someday, there may be 1328 * need to select this behavior, in which case the following 1329 * will need to be revisited. XXX 1330 */ 1331 if (hardlink != NULL) 1332 archive_entry_set_size(entry_main, 0); 1333 1334 /* Save a real file size. */ 1335 real_size = archive_entry_size(entry_main); 1336 /* 1337 * Overwrite a file size by the total size of sparse blocks and 1338 * the size of sparse map info. That file size is the length of 1339 * the data, which we will exactly store into an archive file. 1340 */ 1341 if (archive_strlen(&(pax->sparse_map))) { 1342 size_t mapsize = archive_strlen(&(pax->sparse_map)); 1343 pax->sparse_map_padding = 0x1ff & (-(ssize_t)mapsize); 1344 archive_entry_set_size(entry_main, 1345 mapsize + pax->sparse_map_padding + sparse_total); 1346 } 1347 1348 /* If file size is too large, add 'size' to pax extended attrs. */ 1349 if (archive_entry_size(entry_main) >= (((int64_t)1) << 33)) { 1350 add_pax_attr_int(&(pax->pax_header), "size", 1351 archive_entry_size(entry_main)); 1352 } 1353 1354 /* Format 'ustar' header for main entry. 1355 * 1356 * The trouble with file size: If the reader can't understand 1357 * the file size, they may not be able to locate the next 1358 * entry and the rest of the archive is toast. Pax-compliant 1359 * readers are supposed to ignore the file size in the main 1360 * header, so the question becomes how to maximize portability 1361 * for readers that don't support pax attribute extensions. 1362 * For maximum compatibility, I permit numeric extensions in 1363 * the main header so that the file size stored will always be 1364 * correct, even if it's in a format that only some 1365 * implementations understand. The technique used here is: 1366 * 1367 * a) If possible, follow the standard exactly. This handles 1368 * files up to 8 gigabytes minus 1. 1369 * 1370 * b) If that fails, try octal but omit the field terminator. 1371 * That handles files up to 64 gigabytes minus 1. 1372 * 1373 * c) Otherwise, use base-256 extensions. That handles files 1374 * up to 2^63 in this implementation, with the potential to 1375 * go up to 2^94. That should hold us for a while. ;-) 1376 * 1377 * The non-strict formatter uses similar logic for other 1378 * numeric fields, though they're less critical. 1379 */ 1380 if (__archive_write_format_header_ustar(a, ustarbuff, entry_main, -1, 0, 1381 NULL) == ARCHIVE_FATAL) { 1382 archive_entry_free(entry_main); 1383 archive_string_free(&entry_name); 1384 return (ARCHIVE_FATAL); 1385 } 1386 1387 /* If we built any extended attributes, write that entry first. */ 1388 if (archive_strlen(&(pax->pax_header)) > 0) { 1389 struct archive_entry *pax_attr_entry; 1390 time_t s; 1391 int64_t uid, gid; 1392 int mode; 1393 1394 pax_attr_entry = archive_entry_new2(&a->archive); 1395 p = entry_name.s; 1396 archive_entry_set_pathname(pax_attr_entry, 1397 build_pax_attribute_name(pax_entry_name, p)); 1398 archive_entry_set_size(pax_attr_entry, 1399 archive_strlen(&(pax->pax_header))); 1400 /* Copy uid/gid (but clip to ustar limits). */ 1401 uid = archive_entry_uid(entry_main); 1402 if (uid >= 1 << 18) 1403 uid = (1 << 18) - 1; 1404 archive_entry_set_uid(pax_attr_entry, uid); 1405 gid = archive_entry_gid(entry_main); 1406 if (gid >= 1 << 18) 1407 gid = (1 << 18) - 1; 1408 archive_entry_set_gid(pax_attr_entry, gid); 1409 /* Copy mode over (but not setuid/setgid bits) */ 1410 mode = archive_entry_mode(entry_main); 1411 #ifdef S_ISUID 1412 mode &= ~S_ISUID; 1413 #endif 1414 #ifdef S_ISGID 1415 mode &= ~S_ISGID; 1416 #endif 1417 #ifdef S_ISVTX 1418 mode &= ~S_ISVTX; 1419 #endif 1420 archive_entry_set_mode(pax_attr_entry, mode); 1421 1422 /* Copy uname/gname. */ 1423 archive_entry_set_uname(pax_attr_entry, 1424 archive_entry_uname(entry_main)); 1425 archive_entry_set_gname(pax_attr_entry, 1426 archive_entry_gname(entry_main)); 1427 1428 /* Copy mtime, but clip to ustar limits. */ 1429 s = archive_entry_mtime(entry_main); 1430 if (s < 0) { s = 0; } 1431 if (s >= 0x7fffffff) { s = 0x7fffffff; } 1432 archive_entry_set_mtime(pax_attr_entry, s, 0); 1433 1434 /* Standard ustar doesn't support atime. */ 1435 archive_entry_set_atime(pax_attr_entry, 0, 0); 1436 1437 /* Standard ustar doesn't support ctime. */ 1438 archive_entry_set_ctime(pax_attr_entry, 0, 0); 1439 1440 r = __archive_write_format_header_ustar(a, paxbuff, 1441 pax_attr_entry, 'x', 1, NULL); 1442 1443 archive_entry_free(pax_attr_entry); 1444 1445 /* Note that the 'x' header shouldn't ever fail to format */ 1446 if (r < ARCHIVE_WARN) { 1447 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 1448 "archive_write_pax_header: " 1449 "'x' header failed?! This can't happen.\n"); 1450 archive_entry_free(entry_main); 1451 archive_string_free(&entry_name); 1452 return (ARCHIVE_FATAL); 1453 } else if (r < ret) 1454 ret = r; 1455 r = __archive_write_output(a, paxbuff, 512); 1456 if (r != ARCHIVE_OK) { 1457 sparse_list_clear(pax); 1458 pax->entry_bytes_remaining = 0; 1459 pax->entry_padding = 0; 1460 archive_entry_free(entry_main); 1461 archive_string_free(&entry_name); 1462 return (ARCHIVE_FATAL); 1463 } 1464 1465 pax->entry_bytes_remaining = archive_strlen(&(pax->pax_header)); 1466 pax->entry_padding = 1467 0x1ff & (-(int64_t)pax->entry_bytes_remaining); 1468 1469 r = __archive_write_output(a, pax->pax_header.s, 1470 archive_strlen(&(pax->pax_header))); 1471 if (r != ARCHIVE_OK) { 1472 /* If a write fails, we're pretty much toast. */ 1473 archive_entry_free(entry_main); 1474 archive_string_free(&entry_name); 1475 return (ARCHIVE_FATAL); 1476 } 1477 /* Pad out the end of the entry. */ 1478 r = __archive_write_nulls(a, (size_t)pax->entry_padding); 1479 if (r != ARCHIVE_OK) { 1480 /* If a write fails, we're pretty much toast. */ 1481 archive_entry_free(entry_main); 1482 archive_string_free(&entry_name); 1483 return (ARCHIVE_FATAL); 1484 } 1485 pax->entry_bytes_remaining = pax->entry_padding = 0; 1486 } 1487 1488 /* Write the header for main entry. */ 1489 r = __archive_write_output(a, ustarbuff, 512); 1490 if (r != ARCHIVE_OK) { 1491 archive_entry_free(entry_main); 1492 archive_string_free(&entry_name); 1493 return (r); 1494 } 1495 1496 /* 1497 * Inform the client of the on-disk size we're using, so 1498 * they can avoid unnecessarily writing a body for something 1499 * that we're just going to ignore. 1500 */ 1501 archive_entry_set_size(entry_original, real_size); 1502 if (pax->sparse_list == NULL && real_size > 0) { 1503 /* This is not a sparse file but we handle its data as 1504 * a sparse block. */ 1505 sparse_list_add(pax, 0, real_size); 1506 sparse_total = real_size; 1507 } 1508 pax->entry_padding = 0x1ff & (-(int64_t)sparse_total); 1509 archive_entry_free(entry_main); 1510 archive_string_free(&entry_name); 1511 1512 return (ret); 1513 } 1514 1515 /* 1516 * We need a valid name for the regular 'ustar' entry. This routine 1517 * tries to hack something more-or-less reasonable. 1518 * 1519 * The approach here tries to preserve leading dir names. We do so by 1520 * working with four sections: 1521 * 1) "prefix" directory names, 1522 * 2) "suffix" directory names, 1523 * 3) inserted dir name (optional), 1524 * 4) filename. 1525 * 1526 * These sections must satisfy the following requirements: 1527 * * Parts 1 & 2 together form an initial portion of the dir name. 1528 * * Part 3 is specified by the caller. (It should not contain a leading 1529 * or trailing '/'.) 1530 * * Part 4 forms an initial portion of the base filename. 1531 * * The filename must be <= 99 chars to fit the ustar 'name' field. 1532 * * Parts 2, 3, 4 together must be <= 99 chars to fit the ustar 'name' fld. 1533 * * Part 1 must be <= 155 chars to fit the ustar 'prefix' field. 1534 * * If the original name ends in a '/', the new name must also end in a '/' 1535 * * Trailing '/.' sequences may be stripped. 1536 * 1537 * Note: Recall that the ustar format does not store the '/' separating 1538 * parts 1 & 2, but does store the '/' separating parts 2 & 3. 1539 */ 1540 static char * 1541 build_ustar_entry_name(char *dest, const char *src, size_t src_length, 1542 const char *insert) 1543 { 1544 const char *prefix, *prefix_end; 1545 const char *suffix, *suffix_end; 1546 const char *filename, *filename_end; 1547 char *p; 1548 int need_slash = 0; /* Was there a trailing slash? */ 1549 size_t suffix_length = 99; 1550 size_t insert_length; 1551 1552 /* Length of additional dir element to be added. */ 1553 if (insert == NULL) 1554 insert_length = 0; 1555 else 1556 /* +2 here allows for '/' before and after the insert. */ 1557 insert_length = strlen(insert) + 2; 1558 1559 /* Step 0: Quick bailout in a common case. */ 1560 if (src_length < 100 && insert == NULL) { 1561 strncpy(dest, src, src_length); 1562 dest[src_length] = '\0'; 1563 return (dest); 1564 } 1565 1566 /* Step 1: Locate filename and enforce the length restriction. */ 1567 filename_end = src + src_length; 1568 /* Remove trailing '/' chars and '/.' pairs. */ 1569 for (;;) { 1570 if (filename_end > src && filename_end[-1] == '/') { 1571 filename_end --; 1572 need_slash = 1; /* Remember to restore trailing '/'. */ 1573 continue; 1574 } 1575 if (filename_end > src + 1 && filename_end[-1] == '.' 1576 && filename_end[-2] == '/') { 1577 filename_end -= 2; 1578 need_slash = 1; /* "foo/." will become "foo/" */ 1579 continue; 1580 } 1581 break; 1582 } 1583 if (need_slash) 1584 suffix_length--; 1585 /* Find start of filename. */ 1586 filename = filename_end - 1; 1587 while ((filename > src) && (*filename != '/')) 1588 filename --; 1589 if ((*filename == '/') && (filename < filename_end - 1)) 1590 filename ++; 1591 /* Adjust filename_end so that filename + insert fits in 99 chars. */ 1592 suffix_length -= insert_length; 1593 if (filename_end > filename + suffix_length) 1594 filename_end = filename + suffix_length; 1595 /* Calculate max size for "suffix" section (#3 above). */ 1596 suffix_length -= filename_end - filename; 1597 1598 /* Step 2: Locate the "prefix" section of the dirname, including 1599 * trailing '/'. */ 1600 prefix = src; 1601 prefix_end = prefix + 155; 1602 if (prefix_end > filename) 1603 prefix_end = filename; 1604 while (prefix_end > prefix && *prefix_end != '/') 1605 prefix_end--; 1606 if ((prefix_end < filename) && (*prefix_end == '/')) 1607 prefix_end++; 1608 1609 /* Step 3: Locate the "suffix" section of the dirname, 1610 * including trailing '/'. */ 1611 suffix = prefix_end; 1612 suffix_end = suffix + suffix_length; /* Enforce limit. */ 1613 if (suffix_end > filename) 1614 suffix_end = filename; 1615 if (suffix_end < suffix) 1616 suffix_end = suffix; 1617 while (suffix_end > suffix && *suffix_end != '/') 1618 suffix_end--; 1619 if ((suffix_end < filename) && (*suffix_end == '/')) 1620 suffix_end++; 1621 1622 /* Step 4: Build the new name. */ 1623 /* The OpenBSD strlcpy function is safer, but less portable. */ 1624 /* Rather than maintain two versions, just use the strncpy version. */ 1625 p = dest; 1626 if (prefix_end > prefix) { 1627 strncpy(p, prefix, prefix_end - prefix); 1628 p += prefix_end - prefix; 1629 } 1630 if (suffix_end > suffix) { 1631 strncpy(p, suffix, suffix_end - suffix); 1632 p += suffix_end - suffix; 1633 } 1634 if (insert != NULL) { 1635 /* Note: assume insert does not have leading or trailing '/' */ 1636 strcpy(p, insert); 1637 p += strlen(insert); 1638 *p++ = '/'; 1639 } 1640 strncpy(p, filename, filename_end - filename); 1641 p += filename_end - filename; 1642 if (need_slash) 1643 *p++ = '/'; 1644 *p = '\0'; 1645 1646 return (dest); 1647 } 1648 1649 /* 1650 * The ustar header for the pax extended attributes must have a 1651 * reasonable name: SUSv3 requires 'dirname'/PaxHeader.'pid'/'filename' 1652 * where 'pid' is the PID of the archiving process. Unfortunately, 1653 * that makes testing a pain since the output varies for each run, 1654 * so I'm sticking with the simpler 'dirname'/PaxHeader/'filename' 1655 * for now. (Someday, I'll make this settable. Then I can use the 1656 * SUS recommendation as default and test harnesses can override it 1657 * to get predictable results.) 1658 * 1659 * Joerg Schilling has argued that this is unnecessary because, in 1660 * practice, if the pax extended attributes get extracted as regular 1661 * files, no one is going to bother reading those attributes to 1662 * manually restore them. Based on this, 'star' uses 1663 * /tmp/PaxHeader/'basename' as the ustar header name. This is a 1664 * tempting argument, in part because it's simpler than the SUSv3 1665 * recommendation, but I'm not entirely convinced. I'm also 1666 * uncomfortable with the fact that "/tmp" is a Unix-ism. 1667 * 1668 * The following routine leverages build_ustar_entry_name() above and 1669 * so is simpler than you might think. It just needs to provide the 1670 * additional path element and handle a few pathological cases). 1671 */ 1672 static char * 1673 build_pax_attribute_name(char *dest, const char *src) 1674 { 1675 char buff[64]; 1676 const char *p; 1677 1678 /* Handle the null filename case. */ 1679 if (src == NULL || *src == '\0') { 1680 strcpy(dest, "PaxHeader/blank"); 1681 return (dest); 1682 } 1683 1684 /* Prune final '/' and other unwanted final elements. */ 1685 p = src + strlen(src); 1686 for (;;) { 1687 /* Ends in "/", remove the '/' */ 1688 if (p > src && p[-1] == '/') { 1689 --p; 1690 continue; 1691 } 1692 /* Ends in "/.", remove the '.' */ 1693 if (p > src + 1 && p[-1] == '.' 1694 && p[-2] == '/') { 1695 --p; 1696 continue; 1697 } 1698 break; 1699 } 1700 1701 /* Pathological case: After above, there was nothing left. 1702 * This includes "/." "/./." "/.//./." etc. */ 1703 if (p == src) { 1704 strcpy(dest, "/PaxHeader/rootdir"); 1705 return (dest); 1706 } 1707 1708 /* Convert unadorned "." into a suitable filename. */ 1709 if (*src == '.' && p == src + 1) { 1710 strcpy(dest, "PaxHeader/currentdir"); 1711 return (dest); 1712 } 1713 1714 /* 1715 * TODO: Push this string into the 'pax' structure to avoid 1716 * recomputing it every time. That will also open the door 1717 * to having clients override it. 1718 */ 1719 #if HAVE_GETPID && 0 /* Disable this for now; see above comment. */ 1720 snprintf(buff, sizeof(buff), "PaxHeader.%d", getpid()); 1721 #else 1722 /* If the platform can't fetch the pid, don't include it. */ 1723 strcpy(buff, "PaxHeader"); 1724 #endif 1725 /* General case: build a ustar-compatible name adding 1726 * "/PaxHeader/". */ 1727 build_ustar_entry_name(dest, src, p - src, buff); 1728 1729 return (dest); 1730 } 1731 1732 /* 1733 * GNU PAX Format 1.0 requires the special name, which pattern is: 1734 * <dir>/GNUSparseFile.<pid>/<original file name> 1735 * 1736 * Since reproducible archives are more important, use 0 as pid. 1737 * 1738 * This function is used for only Sparse file, a file type of which 1739 * is regular file. 1740 */ 1741 static char * 1742 build_gnu_sparse_name(char *dest, const char *src) 1743 { 1744 const char *p; 1745 1746 /* Handle the null filename case. */ 1747 if (src == NULL || *src == '\0') { 1748 strcpy(dest, "GNUSparseFile/blank"); 1749 return (dest); 1750 } 1751 1752 /* Prune final '/' and other unwanted final elements. */ 1753 p = src + strlen(src); 1754 for (;;) { 1755 /* Ends in "/", remove the '/' */ 1756 if (p > src && p[-1] == '/') { 1757 --p; 1758 continue; 1759 } 1760 /* Ends in "/.", remove the '.' */ 1761 if (p > src + 1 && p[-1] == '.' 1762 && p[-2] == '/') { 1763 --p; 1764 continue; 1765 } 1766 break; 1767 } 1768 1769 /* General case: build a ustar-compatible name adding 1770 * "/GNUSparseFile/". */ 1771 build_ustar_entry_name(dest, src, p - src, "GNUSparseFile.0"); 1772 1773 return (dest); 1774 } 1775 1776 /* Write two null blocks for the end of archive */ 1777 static int 1778 archive_write_pax_close(struct archive_write *a) 1779 { 1780 return (__archive_write_nulls(a, 512 * 2)); 1781 } 1782 1783 static int 1784 archive_write_pax_free(struct archive_write *a) 1785 { 1786 struct pax *pax; 1787 1788 pax = (struct pax *)a->format_data; 1789 if (pax == NULL) 1790 return (ARCHIVE_OK); 1791 1792 archive_string_free(&pax->pax_header); 1793 archive_string_free(&pax->sparse_map); 1794 archive_string_free(&pax->l_url_encoded_name); 1795 sparse_list_clear(pax); 1796 free(pax); 1797 a->format_data = NULL; 1798 return (ARCHIVE_OK); 1799 } 1800 1801 static int 1802 archive_write_pax_finish_entry(struct archive_write *a) 1803 { 1804 struct pax *pax; 1805 uint64_t remaining; 1806 int ret; 1807 1808 pax = (struct pax *)a->format_data; 1809 remaining = pax->entry_bytes_remaining; 1810 if (remaining == 0) { 1811 while (pax->sparse_list) { 1812 struct sparse_block *sb; 1813 if (!pax->sparse_list->is_hole) 1814 remaining += pax->sparse_list->remaining; 1815 sb = pax->sparse_list->next; 1816 free(pax->sparse_list); 1817 pax->sparse_list = sb; 1818 } 1819 } 1820 ret = __archive_write_nulls(a, (size_t)(remaining + pax->entry_padding)); 1821 pax->entry_bytes_remaining = pax->entry_padding = 0; 1822 return (ret); 1823 } 1824 1825 static ssize_t 1826 archive_write_pax_data(struct archive_write *a, const void *buff, size_t s) 1827 { 1828 struct pax *pax; 1829 size_t ws; 1830 size_t total; 1831 int ret; 1832 1833 pax = (struct pax *)a->format_data; 1834 1835 /* 1836 * According to GNU PAX format 1.0, write a sparse map 1837 * before the body. 1838 */ 1839 if (archive_strlen(&(pax->sparse_map))) { 1840 ret = __archive_write_output(a, pax->sparse_map.s, 1841 archive_strlen(&(pax->sparse_map))); 1842 if (ret != ARCHIVE_OK) 1843 return (ret); 1844 ret = __archive_write_nulls(a, pax->sparse_map_padding); 1845 if (ret != ARCHIVE_OK) 1846 return (ret); 1847 archive_string_empty(&(pax->sparse_map)); 1848 } 1849 1850 total = 0; 1851 while (total < s) { 1852 const unsigned char *p; 1853 1854 while (pax->sparse_list != NULL && 1855 pax->sparse_list->remaining == 0) { 1856 struct sparse_block *sb = pax->sparse_list->next; 1857 free(pax->sparse_list); 1858 pax->sparse_list = sb; 1859 } 1860 1861 if (pax->sparse_list == NULL) 1862 return (total); 1863 1864 p = ((const unsigned char *)buff) + total; 1865 ws = s - total; 1866 if (ws > pax->sparse_list->remaining) 1867 ws = (size_t)pax->sparse_list->remaining; 1868 1869 if (pax->sparse_list->is_hole) { 1870 /* Current block is hole thus we do not write 1871 * the body. */ 1872 pax->sparse_list->remaining -= ws; 1873 total += ws; 1874 continue; 1875 } 1876 1877 ret = __archive_write_output(a, p, ws); 1878 pax->sparse_list->remaining -= ws; 1879 total += ws; 1880 if (ret != ARCHIVE_OK) 1881 return (ret); 1882 } 1883 return (total); 1884 } 1885 1886 static int 1887 has_non_ASCII(const char *_p) 1888 { 1889 const unsigned char *p = (const unsigned char *)_p; 1890 1891 if (p == NULL) 1892 return (1); 1893 while (*p != '\0' && *p < 128) 1894 p++; 1895 return (*p != '\0'); 1896 } 1897 1898 /* 1899 * Used by extended attribute support; encodes the name 1900 * so that there will be no '=' characters in the result. 1901 */ 1902 static char * 1903 url_encode(const char *in) 1904 { 1905 const char *s; 1906 char *d; 1907 int out_len = 0; 1908 char *out; 1909 1910 for (s = in; *s != '\0'; s++) { 1911 if (*s < 33 || *s > 126 || *s == '%' || *s == '=') 1912 out_len += 3; 1913 else 1914 out_len++; 1915 } 1916 1917 out = (char *)malloc(out_len + 1); 1918 if (out == NULL) 1919 return (NULL); 1920 1921 for (s = in, d = out; *s != '\0'; s++) { 1922 /* encode any non-printable ASCII character or '%' or '=' */ 1923 if (*s < 33 || *s > 126 || *s == '%' || *s == '=') { 1924 /* URL encoding is '%' followed by two hex digits */ 1925 *d++ = '%'; 1926 *d++ = "0123456789ABCDEF"[0x0f & (*s >> 4)]; 1927 *d++ = "0123456789ABCDEF"[0x0f & *s]; 1928 } else { 1929 *d++ = *s; 1930 } 1931 } 1932 *d = '\0'; 1933 return (out); 1934 } 1935 1936 /* 1937 * Encode a sequence of bytes into a C string using base-64 encoding. 1938 * 1939 * Returns a null-terminated C string allocated with malloc(); caller 1940 * is responsible for freeing the result. 1941 */ 1942 static char * 1943 base64_encode(const char *s, size_t len) 1944 { 1945 static const char digits[64] = 1946 { 'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O', 1947 'P','Q','R','S','T','U','V','W','X','Y','Z','a','b','c','d', 1948 'e','f','g','h','i','j','k','l','m','n','o','p','q','r','s', 1949 't','u','v','w','x','y','z','0','1','2','3','4','5','6','7', 1950 '8','9','+','/' }; 1951 int v; 1952 char *d, *out; 1953 1954 /* 3 bytes becomes 4 chars, but round up and allow for trailing NUL */ 1955 out = (char *)malloc((len * 4 + 2) / 3 + 1); 1956 if (out == NULL) 1957 return (NULL); 1958 d = out; 1959 1960 /* Convert each group of 3 bytes into 4 characters. */ 1961 while (len >= 3) { 1962 v = (((int)s[0] << 16) & 0xff0000) 1963 | (((int)s[1] << 8) & 0xff00) 1964 | (((int)s[2]) & 0x00ff); 1965 s += 3; 1966 len -= 3; 1967 *d++ = digits[(v >> 18) & 0x3f]; 1968 *d++ = digits[(v >> 12) & 0x3f]; 1969 *d++ = digits[(v >> 6) & 0x3f]; 1970 *d++ = digits[(v) & 0x3f]; 1971 } 1972 /* Handle final group of 1 byte (2 chars) or 2 bytes (3 chars). */ 1973 switch (len) { 1974 case 0: break; 1975 case 1: 1976 v = (((int)s[0] << 16) & 0xff0000); 1977 *d++ = digits[(v >> 18) & 0x3f]; 1978 *d++ = digits[(v >> 12) & 0x3f]; 1979 break; 1980 case 2: 1981 v = (((int)s[0] << 16) & 0xff0000) 1982 | (((int)s[1] << 8) & 0xff00); 1983 *d++ = digits[(v >> 18) & 0x3f]; 1984 *d++ = digits[(v >> 12) & 0x3f]; 1985 *d++ = digits[(v >> 6) & 0x3f]; 1986 break; 1987 } 1988 /* Add trailing NUL character so output is a valid C string. */ 1989 *d = '\0'; 1990 return (out); 1991 } 1992 1993 static void 1994 sparse_list_clear(struct pax *pax) 1995 { 1996 while (pax->sparse_list != NULL) { 1997 struct sparse_block *sb = pax->sparse_list; 1998 pax->sparse_list = sb->next; 1999 free(sb); 2000 } 2001 pax->sparse_tail = NULL; 2002 } 2003 2004 static int 2005 _sparse_list_add_block(struct pax *pax, int64_t offset, int64_t length, 2006 int is_hole) 2007 { 2008 struct sparse_block *sb; 2009 2010 sb = (struct sparse_block *)malloc(sizeof(*sb)); 2011 if (sb == NULL) 2012 return (ARCHIVE_FATAL); 2013 sb->next = NULL; 2014 sb->is_hole = is_hole; 2015 sb->offset = offset; 2016 sb->remaining = length; 2017 if (pax->sparse_list == NULL || pax->sparse_tail == NULL) 2018 pax->sparse_list = pax->sparse_tail = sb; 2019 else { 2020 pax->sparse_tail->next = sb; 2021 pax->sparse_tail = sb; 2022 } 2023 return (ARCHIVE_OK); 2024 } 2025 2026 static int 2027 sparse_list_add(struct pax *pax, int64_t offset, int64_t length) 2028 { 2029 int64_t last_offset; 2030 int r; 2031 2032 if (pax->sparse_tail == NULL) 2033 last_offset = 0; 2034 else { 2035 last_offset = pax->sparse_tail->offset + 2036 pax->sparse_tail->remaining; 2037 } 2038 if (last_offset < offset) { 2039 /* Add a hole block. */ 2040 r = _sparse_list_add_block(pax, last_offset, 2041 offset - last_offset, 1); 2042 if (r != ARCHIVE_OK) 2043 return (r); 2044 } 2045 /* Add data block. */ 2046 return (_sparse_list_add_block(pax, offset, length, 0)); 2047 } 2048 2049