archive_write_disk_posix.c revision 313571
1/*- 2 * Copyright (c) 2003-2010 Tim Kientzle 3 * Copyright (c) 2012 Michihiro NAKAJIMA 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer 11 * in this position and unchanged. 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#if !defined(_WIN32) || defined(__CYGWIN__) 32 33#ifdef HAVE_SYS_TYPES_H 34#include <sys/types.h> 35#endif 36#ifdef HAVE_SYS_ACL_H 37#include <sys/acl.h> 38#endif 39#ifdef HAVE_SYS_EXTATTR_H 40#include <sys/extattr.h> 41#endif 42#if defined(HAVE_SYS_XATTR_H) 43#include <sys/xattr.h> 44#elif defined(HAVE_ATTR_XATTR_H) 45#include <attr/xattr.h> 46#endif 47#ifdef HAVE_SYS_EA_H 48#include <sys/ea.h> 49#endif 50#ifdef HAVE_SYS_IOCTL_H 51#include <sys/ioctl.h> 52#endif 53#ifdef HAVE_SYS_STAT_H 54#include <sys/stat.h> 55#endif 56#ifdef HAVE_SYS_TIME_H 57#include <sys/time.h> 58#endif 59#ifdef HAVE_SYS_UTIME_H 60#include <sys/utime.h> 61#endif 62#ifdef HAVE_COPYFILE_H 63#include <copyfile.h> 64#endif 65#ifdef HAVE_ERRNO_H 66#include <errno.h> 67#endif 68#ifdef HAVE_FCNTL_H 69#include <fcntl.h> 70#endif 71#ifdef HAVE_GRP_H 72#include <grp.h> 73#endif 74#ifdef HAVE_LANGINFO_H 75#include <langinfo.h> 76#endif 77#ifdef HAVE_LINUX_FS_H 78#include <linux/fs.h> /* for Linux file flags */ 79#endif 80/* 81 * Some Linux distributions have both linux/ext2_fs.h and ext2fs/ext2_fs.h. 82 * As the include guards don't agree, the order of include is important. 83 */ 84#ifdef HAVE_LINUX_EXT2_FS_H 85#include <linux/ext2_fs.h> /* for Linux file flags */ 86#endif 87#if defined(HAVE_EXT2FS_EXT2_FS_H) && !defined(__CYGWIN__) 88#include <ext2fs/ext2_fs.h> /* Linux file flags, broken on Cygwin */ 89#endif 90#ifdef HAVE_LIMITS_H 91#include <limits.h> 92#endif 93#ifdef HAVE_PWD_H 94#include <pwd.h> 95#endif 96#include <stdio.h> 97#ifdef HAVE_STDLIB_H 98#include <stdlib.h> 99#endif 100#ifdef HAVE_STRING_H 101#include <string.h> 102#endif 103#ifdef HAVE_UNISTD_H 104#include <unistd.h> 105#endif 106#ifdef HAVE_UTIME_H 107#include <utime.h> 108#endif 109#ifdef F_GETTIMES /* Tru64 specific */ 110#include <sys/fcntl1.h> 111#endif 112 113/* 114 * Macro to cast st_mtime and time_t to an int64 so that 2 numbers can reliably be compared. 115 * 116 * It assumes that the input is an integer type of no more than 64 bits. 117 * If the number is less than zero, t must be a signed type, so it fits in 118 * int64_t. Otherwise, it's a nonnegative value so we can cast it to uint64_t 119 * without loss. But it could be a large unsigned value, so we have to clip it 120 * to INT64_MAX.* 121 */ 122#define to_int64_time(t) \ 123 ((t) < 0 ? (int64_t)(t) : (uint64_t)(t) > (uint64_t)INT64_MAX ? INT64_MAX : (int64_t)(t)) 124 125#if __APPLE__ 126#include <TargetConditionals.h> 127#if TARGET_OS_MAC && !TARGET_OS_EMBEDDED && HAVE_QUARANTINE_H 128#include <quarantine.h> 129#define HAVE_QUARANTINE 1 130#endif 131#endif 132 133#ifdef HAVE_ZLIB_H 134#include <zlib.h> 135#endif 136 137/* TODO: Support Mac OS 'quarantine' feature. This is really just a 138 * standard tag to mark files that have been downloaded as "tainted". 139 * On Mac OS, we should mark the extracted files as tainted if the 140 * archive being read was tainted. Windows has a similar feature; we 141 * should investigate ways to support this generically. */ 142 143#include "archive.h" 144#include "archive_acl_private.h" 145#include "archive_string.h" 146#include "archive_endian.h" 147#include "archive_entry.h" 148#include "archive_private.h" 149#include "archive_write_disk_private.h" 150 151#ifndef O_BINARY 152#define O_BINARY 0 153#endif 154#ifndef O_CLOEXEC 155#define O_CLOEXEC 0 156#endif 157 158/* Ignore non-int O_NOFOLLOW constant. */ 159/* gnulib's fcntl.h does this on AIX, but it seems practical everywhere */ 160#if defined O_NOFOLLOW && !(INT_MIN <= O_NOFOLLOW && O_NOFOLLOW <= INT_MAX) 161#undef O_NOFOLLOW 162#endif 163 164#ifndef O_NOFOLLOW 165#define O_NOFOLLOW 0 166#endif 167 168struct fixup_entry { 169 struct fixup_entry *next; 170 struct archive_acl acl; 171 mode_t mode; 172 int64_t atime; 173 int64_t birthtime; 174 int64_t mtime; 175 int64_t ctime; 176 unsigned long atime_nanos; 177 unsigned long birthtime_nanos; 178 unsigned long mtime_nanos; 179 unsigned long ctime_nanos; 180 unsigned long fflags_set; 181 size_t mac_metadata_size; 182 void *mac_metadata; 183 int fixup; /* bitmask of what needs fixing */ 184 char *name; 185}; 186 187/* 188 * We use a bitmask to track which operations remain to be done for 189 * this file. In particular, this helps us avoid unnecessary 190 * operations when it's possible to take care of one step as a 191 * side-effect of another. For example, mkdir() can specify the mode 192 * for the newly-created object but symlink() cannot. This means we 193 * can skip chmod() if mkdir() succeeded, but we must explicitly 194 * chmod() if we're trying to create a directory that already exists 195 * (mkdir() failed) or if we're restoring a symlink. Similarly, we 196 * need to verify UID/GID before trying to restore SUID/SGID bits; 197 * that verification can occur explicitly through a stat() call or 198 * implicitly because of a successful chown() call. 199 */ 200#define TODO_MODE_FORCE 0x40000000 201#define TODO_MODE_BASE 0x20000000 202#define TODO_SUID 0x10000000 203#define TODO_SUID_CHECK 0x08000000 204#define TODO_SGID 0x04000000 205#define TODO_SGID_CHECK 0x02000000 206#define TODO_APPLEDOUBLE 0x01000000 207#define TODO_MODE (TODO_MODE_BASE|TODO_SUID|TODO_SGID) 208#define TODO_TIMES ARCHIVE_EXTRACT_TIME 209#define TODO_OWNER ARCHIVE_EXTRACT_OWNER 210#define TODO_FFLAGS ARCHIVE_EXTRACT_FFLAGS 211#define TODO_ACLS ARCHIVE_EXTRACT_ACL 212#define TODO_XATTR ARCHIVE_EXTRACT_XATTR 213#define TODO_MAC_METADATA ARCHIVE_EXTRACT_MAC_METADATA 214#define TODO_HFS_COMPRESSION ARCHIVE_EXTRACT_HFS_COMPRESSION_FORCED 215 216struct archive_write_disk { 217 struct archive archive; 218 219 mode_t user_umask; 220 struct fixup_entry *fixup_list; 221 struct fixup_entry *current_fixup; 222 int64_t user_uid; 223 int skip_file_set; 224 int64_t skip_file_dev; 225 int64_t skip_file_ino; 226 time_t start_time; 227 228 int64_t (*lookup_gid)(void *private, const char *gname, int64_t gid); 229 void (*cleanup_gid)(void *private); 230 void *lookup_gid_data; 231 int64_t (*lookup_uid)(void *private, const char *uname, int64_t uid); 232 void (*cleanup_uid)(void *private); 233 void *lookup_uid_data; 234 235 /* 236 * Full path of last file to satisfy symlink checks. 237 */ 238 struct archive_string path_safe; 239 240 /* 241 * Cached stat data from disk for the current entry. 242 * If this is valid, pst points to st. Otherwise, 243 * pst is null. 244 */ 245 struct stat st; 246 struct stat *pst; 247 248 /* Information about the object being restored right now. */ 249 struct archive_entry *entry; /* Entry being extracted. */ 250 char *name; /* Name of entry, possibly edited. */ 251 struct archive_string _name_data; /* backing store for 'name' */ 252 /* Tasks remaining for this object. */ 253 int todo; 254 /* Tasks deferred until end-of-archive. */ 255 int deferred; 256 /* Options requested by the client. */ 257 int flags; 258 /* Handle for the file we're restoring. */ 259 int fd; 260 /* Current offset for writing data to the file. */ 261 int64_t offset; 262 /* Last offset actually written to disk. */ 263 int64_t fd_offset; 264 /* Total bytes actually written to files. */ 265 int64_t total_bytes_written; 266 /* Maximum size of file, -1 if unknown. */ 267 int64_t filesize; 268 /* Dir we were in before this restore; only for deep paths. */ 269 int restore_pwd; 270 /* Mode we should use for this entry; affected by _PERM and umask. */ 271 mode_t mode; 272 /* UID/GID to use in restoring this entry. */ 273 int64_t uid; 274 int64_t gid; 275 /* 276 * HFS+ Compression. 277 */ 278 /* Xattr "com.apple.decmpfs". */ 279 uint32_t decmpfs_attr_size; 280 unsigned char *decmpfs_header_p; 281 /* ResourceFork set options used for fsetxattr. */ 282 int rsrc_xattr_options; 283 /* Xattr "com.apple.ResourceFork". */ 284 unsigned char *resource_fork; 285 size_t resource_fork_allocated_size; 286 unsigned int decmpfs_block_count; 287 uint32_t *decmpfs_block_info; 288 /* Buffer for compressed data. */ 289 unsigned char *compressed_buffer; 290 size_t compressed_buffer_size; 291 size_t compressed_buffer_remaining; 292 /* The offset of the ResourceFork where compressed data will 293 * be placed. */ 294 uint32_t compressed_rsrc_position; 295 uint32_t compressed_rsrc_position_v; 296 /* Buffer for uncompressed data. */ 297 char *uncompressed_buffer; 298 size_t block_remaining_bytes; 299 size_t file_remaining_bytes; 300#ifdef HAVE_ZLIB_H 301 z_stream stream; 302 int stream_valid; 303 int decmpfs_compression_level; 304#endif 305}; 306 307/* 308 * Default mode for dirs created automatically (will be modified by umask). 309 * Note that POSIX specifies 0777 for implicitly-created dirs, "modified 310 * by the process' file creation mask." 311 */ 312#define DEFAULT_DIR_MODE 0777 313/* 314 * Dir modes are restored in two steps: During the extraction, the permissions 315 * in the archive are modified to match the following limits. During 316 * the post-extract fixup pass, the permissions from the archive are 317 * applied. 318 */ 319#define MINIMUM_DIR_MODE 0700 320#define MAXIMUM_DIR_MODE 0775 321 322/* 323 * Maximum uncompressed size of a decmpfs block. 324 */ 325#define MAX_DECMPFS_BLOCK_SIZE (64 * 1024) 326/* 327 * HFS+ compression type. 328 */ 329#define CMP_XATTR 3/* Compressed data in xattr. */ 330#define CMP_RESOURCE_FORK 4/* Compressed data in resource fork. */ 331/* 332 * HFS+ compression resource fork. 333 */ 334#define RSRC_H_SIZE 260 /* Base size of Resource fork header. */ 335#define RSRC_F_SIZE 50 /* Size of Resource fork footer. */ 336/* Size to write compressed data to resource fork. */ 337#define COMPRESSED_W_SIZE (64 * 1024) 338/* decmpfs definitions. */ 339#define MAX_DECMPFS_XATTR_SIZE 3802 340#ifndef DECMPFS_XATTR_NAME 341#define DECMPFS_XATTR_NAME "com.apple.decmpfs" 342#endif 343#define DECMPFS_MAGIC 0x636d7066 344#define DECMPFS_COMPRESSION_MAGIC 0 345#define DECMPFS_COMPRESSION_TYPE 4 346#define DECMPFS_UNCOMPRESSED_SIZE 8 347#define DECMPFS_HEADER_SIZE 16 348 349#define HFS_BLOCKS(s) ((s) >> 12) 350 351static void fsobj_error(int *, struct archive_string *, int, const char *, 352 const char *); 353static int check_symlinks_fsobj(char *, int *, struct archive_string *, 354 int); 355static int check_symlinks(struct archive_write_disk *); 356static int create_filesystem_object(struct archive_write_disk *); 357static struct fixup_entry *current_fixup(struct archive_write_disk *, 358 const char *pathname); 359#if defined(HAVE_FCHDIR) && defined(PATH_MAX) 360static void edit_deep_directories(struct archive_write_disk *ad); 361#endif 362static int cleanup_pathname_fsobj(char *, int *, struct archive_string *, 363 int); 364static int cleanup_pathname(struct archive_write_disk *); 365static int create_dir(struct archive_write_disk *, char *); 366static int create_parent_dir(struct archive_write_disk *, char *); 367static ssize_t hfs_write_data_block(struct archive_write_disk *, 368 const char *, size_t); 369static int fixup_appledouble(struct archive_write_disk *, const char *); 370static int older(struct stat *, struct archive_entry *); 371static int restore_entry(struct archive_write_disk *); 372static int set_mac_metadata(struct archive_write_disk *, const char *, 373 const void *, size_t); 374static int set_xattrs(struct archive_write_disk *); 375static int clear_nochange_fflags(struct archive_write_disk *); 376static int set_fflags(struct archive_write_disk *); 377static int set_fflags_platform(struct archive_write_disk *, int fd, 378 const char *name, mode_t mode, 379 unsigned long fflags_set, unsigned long fflags_clear); 380static int set_ownership(struct archive_write_disk *); 381static int set_mode(struct archive_write_disk *, int mode); 382static int set_time(int, int, const char *, time_t, long, time_t, long); 383static int set_times(struct archive_write_disk *, int, int, const char *, 384 time_t, long, time_t, long, time_t, long, time_t, long); 385static int set_times_from_entry(struct archive_write_disk *); 386static struct fixup_entry *sort_dir_list(struct fixup_entry *p); 387static ssize_t write_data_block(struct archive_write_disk *, 388 const char *, size_t); 389 390static struct archive_vtable *archive_write_disk_vtable(void); 391 392static int _archive_write_disk_close(struct archive *); 393static int _archive_write_disk_free(struct archive *); 394static int _archive_write_disk_header(struct archive *, 395 struct archive_entry *); 396static int64_t _archive_write_disk_filter_bytes(struct archive *, int); 397static int _archive_write_disk_finish_entry(struct archive *); 398static ssize_t _archive_write_disk_data(struct archive *, const void *, 399 size_t); 400static ssize_t _archive_write_disk_data_block(struct archive *, const void *, 401 size_t, int64_t); 402 403static int 404lazy_stat(struct archive_write_disk *a) 405{ 406 if (a->pst != NULL) { 407 /* Already have stat() data available. */ 408 return (ARCHIVE_OK); 409 } 410#ifdef HAVE_FSTAT 411 if (a->fd >= 0 && fstat(a->fd, &a->st) == 0) { 412 a->pst = &a->st; 413 return (ARCHIVE_OK); 414 } 415#endif 416 /* 417 * XXX At this point, symlinks should not be hit, otherwise 418 * XXX a race occurred. Do we want to check explicitly for that? 419 */ 420 if (lstat(a->name, &a->st) == 0) { 421 a->pst = &a->st; 422 return (ARCHIVE_OK); 423 } 424 archive_set_error(&a->archive, errno, "Couldn't stat file"); 425 return (ARCHIVE_WARN); 426} 427 428static struct archive_vtable * 429archive_write_disk_vtable(void) 430{ 431 static struct archive_vtable av; 432 static int inited = 0; 433 434 if (!inited) { 435 av.archive_close = _archive_write_disk_close; 436 av.archive_filter_bytes = _archive_write_disk_filter_bytes; 437 av.archive_free = _archive_write_disk_free; 438 av.archive_write_header = _archive_write_disk_header; 439 av.archive_write_finish_entry 440 = _archive_write_disk_finish_entry; 441 av.archive_write_data = _archive_write_disk_data; 442 av.archive_write_data_block = _archive_write_disk_data_block; 443 inited = 1; 444 } 445 return (&av); 446} 447 448static int64_t 449_archive_write_disk_filter_bytes(struct archive *_a, int n) 450{ 451 struct archive_write_disk *a = (struct archive_write_disk *)_a; 452 (void)n; /* UNUSED */ 453 if (n == -1 || n == 0) 454 return (a->total_bytes_written); 455 return (-1); 456} 457 458 459int 460archive_write_disk_set_options(struct archive *_a, int flags) 461{ 462 struct archive_write_disk *a = (struct archive_write_disk *)_a; 463 464 a->flags = flags; 465 return (ARCHIVE_OK); 466} 467 468 469/* 470 * Extract this entry to disk. 471 * 472 * TODO: Validate hardlinks. According to the standards, we're 473 * supposed to check each extracted hardlink and squawk if it refers 474 * to a file that we didn't restore. I'm not entirely convinced this 475 * is a good idea, but more importantly: Is there any way to validate 476 * hardlinks without keeping a complete list of filenames from the 477 * entire archive?? Ugh. 478 * 479 */ 480static int 481_archive_write_disk_header(struct archive *_a, struct archive_entry *entry) 482{ 483 struct archive_write_disk *a = (struct archive_write_disk *)_a; 484 struct fixup_entry *fe; 485 int ret, r; 486 487 archive_check_magic(&a->archive, ARCHIVE_WRITE_DISK_MAGIC, 488 ARCHIVE_STATE_HEADER | ARCHIVE_STATE_DATA, 489 "archive_write_disk_header"); 490 archive_clear_error(&a->archive); 491 if (a->archive.state & ARCHIVE_STATE_DATA) { 492 r = _archive_write_disk_finish_entry(&a->archive); 493 if (r == ARCHIVE_FATAL) 494 return (r); 495 } 496 497 /* Set up for this particular entry. */ 498 a->pst = NULL; 499 a->current_fixup = NULL; 500 a->deferred = 0; 501 if (a->entry) { 502 archive_entry_free(a->entry); 503 a->entry = NULL; 504 } 505 a->entry = archive_entry_clone(entry); 506 a->fd = -1; 507 a->fd_offset = 0; 508 a->offset = 0; 509 a->restore_pwd = -1; 510 a->uid = a->user_uid; 511 a->mode = archive_entry_mode(a->entry); 512 if (archive_entry_size_is_set(a->entry)) 513 a->filesize = archive_entry_size(a->entry); 514 else 515 a->filesize = -1; 516 archive_strcpy(&(a->_name_data), archive_entry_pathname(a->entry)); 517 a->name = a->_name_data.s; 518 archive_clear_error(&a->archive); 519 520 /* 521 * Clean up the requested path. This is necessary for correct 522 * dir restores; the dir restore logic otherwise gets messed 523 * up by nonsense like "dir/.". 524 */ 525 ret = cleanup_pathname(a); 526 if (ret != ARCHIVE_OK) 527 return (ret); 528 529 /* 530 * Query the umask so we get predictable mode settings. 531 * This gets done on every call to _write_header in case the 532 * user edits their umask during the extraction for some 533 * reason. 534 */ 535 umask(a->user_umask = umask(0)); 536 537 /* Figure out what we need to do for this entry. */ 538 a->todo = TODO_MODE_BASE; 539 if (a->flags & ARCHIVE_EXTRACT_PERM) { 540 a->todo |= TODO_MODE_FORCE; /* Be pushy about permissions. */ 541 /* 542 * SGID requires an extra "check" step because we 543 * cannot easily predict the GID that the system will 544 * assign. (Different systems assign GIDs to files 545 * based on a variety of criteria, including process 546 * credentials and the gid of the enclosing 547 * directory.) We can only restore the SGID bit if 548 * the file has the right GID, and we only know the 549 * GID if we either set it (see set_ownership) or if 550 * we've actually called stat() on the file after it 551 * was restored. Since there are several places at 552 * which we might verify the GID, we need a TODO bit 553 * to keep track. 554 */ 555 if (a->mode & S_ISGID) 556 a->todo |= TODO_SGID | TODO_SGID_CHECK; 557 /* 558 * Verifying the SUID is simpler, but can still be 559 * done in multiple ways, hence the separate "check" bit. 560 */ 561 if (a->mode & S_ISUID) 562 a->todo |= TODO_SUID | TODO_SUID_CHECK; 563 } else { 564 /* 565 * User didn't request full permissions, so don't 566 * restore SUID, SGID bits and obey umask. 567 */ 568 a->mode &= ~S_ISUID; 569 a->mode &= ~S_ISGID; 570 a->mode &= ~S_ISVTX; 571 a->mode &= ~a->user_umask; 572 } 573 if (a->flags & ARCHIVE_EXTRACT_OWNER) 574 a->todo |= TODO_OWNER; 575 if (a->flags & ARCHIVE_EXTRACT_TIME) 576 a->todo |= TODO_TIMES; 577 if (a->flags & ARCHIVE_EXTRACT_ACL) { 578 if (archive_entry_filetype(a->entry) == AE_IFDIR) 579 a->deferred |= TODO_ACLS; 580 else 581 a->todo |= TODO_ACLS; 582 } 583 if (a->flags & ARCHIVE_EXTRACT_MAC_METADATA) { 584 if (archive_entry_filetype(a->entry) == AE_IFDIR) 585 a->deferred |= TODO_MAC_METADATA; 586 else 587 a->todo |= TODO_MAC_METADATA; 588 } 589#if defined(__APPLE__) && defined(UF_COMPRESSED) && defined(HAVE_ZLIB_H) 590 if ((a->flags & ARCHIVE_EXTRACT_NO_HFS_COMPRESSION) == 0) { 591 unsigned long set, clear; 592 archive_entry_fflags(a->entry, &set, &clear); 593 if ((set & ~clear) & UF_COMPRESSED) { 594 a->todo |= TODO_HFS_COMPRESSION; 595 a->decmpfs_block_count = (unsigned)-1; 596 } 597 } 598 if ((a->flags & ARCHIVE_EXTRACT_HFS_COMPRESSION_FORCED) != 0 && 599 (a->mode & AE_IFMT) == AE_IFREG && a->filesize > 0) { 600 a->todo |= TODO_HFS_COMPRESSION; 601 a->decmpfs_block_count = (unsigned)-1; 602 } 603 { 604 const char *p; 605 606 /* Check if the current file name is a type of the 607 * resource fork file. */ 608 p = strrchr(a->name, '/'); 609 if (p == NULL) 610 p = a->name; 611 else 612 p++; 613 if (p[0] == '.' && p[1] == '_') { 614 /* Do not compress "._XXX" files. */ 615 a->todo &= ~TODO_HFS_COMPRESSION; 616 if (a->filesize > 0) 617 a->todo |= TODO_APPLEDOUBLE; 618 } 619 } 620#endif 621 622 if (a->flags & ARCHIVE_EXTRACT_XATTR) 623 a->todo |= TODO_XATTR; 624 if (a->flags & ARCHIVE_EXTRACT_FFLAGS) 625 a->todo |= TODO_FFLAGS; 626 if (a->flags & ARCHIVE_EXTRACT_SECURE_SYMLINKS) { 627 ret = check_symlinks(a); 628 if (ret != ARCHIVE_OK) 629 return (ret); 630 } 631#if defined(HAVE_FCHDIR) && defined(PATH_MAX) 632 /* If path exceeds PATH_MAX, shorten the path. */ 633 edit_deep_directories(a); 634#endif 635 636 ret = restore_entry(a); 637 638#if defined(__APPLE__) && defined(UF_COMPRESSED) && defined(HAVE_ZLIB_H) 639 /* 640 * Check if the filesystem the file is restoring on supports 641 * HFS+ Compression. If not, cancel HFS+ Compression. 642 */ 643 if (a->todo | TODO_HFS_COMPRESSION) { 644 /* 645 * NOTE: UF_COMPRESSED is ignored even if the filesystem 646 * supports HFS+ Compression because the file should 647 * have at least an extended attribute "com.apple.decmpfs" 648 * before the flag is set to indicate that the file have 649 * been compressed. If the filesystem does not support 650 * HFS+ Compression the system call will fail. 651 */ 652 if (a->fd < 0 || fchflags(a->fd, UF_COMPRESSED) != 0) 653 a->todo &= ~TODO_HFS_COMPRESSION; 654 } 655#endif 656 657 /* 658 * TODO: There are rumours that some extended attributes must 659 * be restored before file data is written. If this is true, 660 * then we either need to write all extended attributes both 661 * before and after restoring the data, or find some rule for 662 * determining which must go first and which last. Due to the 663 * many ways people are using xattrs, this may prove to be an 664 * intractable problem. 665 */ 666 667#ifdef HAVE_FCHDIR 668 /* If we changed directory above, restore it here. */ 669 if (a->restore_pwd >= 0) { 670 r = fchdir(a->restore_pwd); 671 if (r != 0) { 672 archive_set_error(&a->archive, errno, 673 "chdir() failure"); 674 ret = ARCHIVE_FATAL; 675 } 676 close(a->restore_pwd); 677 a->restore_pwd = -1; 678 } 679#endif 680 681 /* 682 * Fixup uses the unedited pathname from archive_entry_pathname(), 683 * because it is relative to the base dir and the edited path 684 * might be relative to some intermediate dir as a result of the 685 * deep restore logic. 686 */ 687 if (a->deferred & TODO_MODE) { 688 fe = current_fixup(a, archive_entry_pathname(entry)); 689 if (fe == NULL) 690 return (ARCHIVE_FATAL); 691 fe->fixup |= TODO_MODE_BASE; 692 fe->mode = a->mode; 693 } 694 695 if ((a->deferred & TODO_TIMES) 696 && (archive_entry_mtime_is_set(entry) 697 || archive_entry_atime_is_set(entry))) { 698 fe = current_fixup(a, archive_entry_pathname(entry)); 699 if (fe == NULL) 700 return (ARCHIVE_FATAL); 701 fe->mode = a->mode; 702 fe->fixup |= TODO_TIMES; 703 if (archive_entry_atime_is_set(entry)) { 704 fe->atime = archive_entry_atime(entry); 705 fe->atime_nanos = archive_entry_atime_nsec(entry); 706 } else { 707 /* If atime is unset, use start time. */ 708 fe->atime = a->start_time; 709 fe->atime_nanos = 0; 710 } 711 if (archive_entry_mtime_is_set(entry)) { 712 fe->mtime = archive_entry_mtime(entry); 713 fe->mtime_nanos = archive_entry_mtime_nsec(entry); 714 } else { 715 /* If mtime is unset, use start time. */ 716 fe->mtime = a->start_time; 717 fe->mtime_nanos = 0; 718 } 719 if (archive_entry_birthtime_is_set(entry)) { 720 fe->birthtime = archive_entry_birthtime(entry); 721 fe->birthtime_nanos = archive_entry_birthtime_nsec( 722 entry); 723 } else { 724 /* If birthtime is unset, use mtime. */ 725 fe->birthtime = fe->mtime; 726 fe->birthtime_nanos = fe->mtime_nanos; 727 } 728 } 729 730 if (a->deferred & TODO_ACLS) { 731 fe = current_fixup(a, archive_entry_pathname(entry)); 732 if (fe == NULL) 733 return (ARCHIVE_FATAL); 734 fe->fixup |= TODO_ACLS; 735 archive_acl_copy(&fe->acl, archive_entry_acl(entry)); 736 } 737 738 if (a->deferred & TODO_MAC_METADATA) { 739 const void *metadata; 740 size_t metadata_size; 741 metadata = archive_entry_mac_metadata(a->entry, &metadata_size); 742 if (metadata != NULL && metadata_size > 0) { 743 fe = current_fixup(a, archive_entry_pathname(entry)); 744 if (fe == NULL) 745 return (ARCHIVE_FATAL); 746 fe->mac_metadata = malloc(metadata_size); 747 if (fe->mac_metadata != NULL) { 748 memcpy(fe->mac_metadata, metadata, 749 metadata_size); 750 fe->mac_metadata_size = metadata_size; 751 fe->fixup |= TODO_MAC_METADATA; 752 } 753 } 754 } 755 756 if (a->deferred & TODO_FFLAGS) { 757 fe = current_fixup(a, archive_entry_pathname(entry)); 758 if (fe == NULL) 759 return (ARCHIVE_FATAL); 760 fe->fixup |= TODO_FFLAGS; 761 /* TODO: Complete this.. defer fflags from below. */ 762 } 763 764 /* We've created the object and are ready to pour data into it. */ 765 if (ret >= ARCHIVE_WARN) 766 a->archive.state = ARCHIVE_STATE_DATA; 767 /* 768 * If it's not open, tell our client not to try writing. 769 * In particular, dirs, links, etc, don't get written to. 770 */ 771 if (a->fd < 0) { 772 archive_entry_set_size(entry, 0); 773 a->filesize = 0; 774 } 775 776 return (ret); 777} 778 779int 780archive_write_disk_set_skip_file(struct archive *_a, int64_t d, int64_t i) 781{ 782 struct archive_write_disk *a = (struct archive_write_disk *)_a; 783 archive_check_magic(&a->archive, ARCHIVE_WRITE_DISK_MAGIC, 784 ARCHIVE_STATE_ANY, "archive_write_disk_set_skip_file"); 785 a->skip_file_set = 1; 786 a->skip_file_dev = d; 787 a->skip_file_ino = i; 788 return (ARCHIVE_OK); 789} 790 791static ssize_t 792write_data_block(struct archive_write_disk *a, const char *buff, size_t size) 793{ 794 uint64_t start_size = size; 795 ssize_t bytes_written = 0; 796 ssize_t block_size = 0, bytes_to_write; 797 798 if (size == 0) 799 return (ARCHIVE_OK); 800 801 if (a->filesize == 0 || a->fd < 0) { 802 archive_set_error(&a->archive, 0, 803 "Attempt to write to an empty file"); 804 return (ARCHIVE_WARN); 805 } 806 807 if (a->flags & ARCHIVE_EXTRACT_SPARSE) { 808#if HAVE_STRUCT_STAT_ST_BLKSIZE 809 int r; 810 if ((r = lazy_stat(a)) != ARCHIVE_OK) 811 return (r); 812 block_size = a->pst->st_blksize; 813#else 814 /* XXX TODO XXX Is there a more appropriate choice here ? */ 815 /* This needn't match the filesystem allocation size. */ 816 block_size = 16*1024; 817#endif 818 } 819 820 /* If this write would run beyond the file size, truncate it. */ 821 if (a->filesize >= 0 && (int64_t)(a->offset + size) > a->filesize) 822 start_size = size = (size_t)(a->filesize - a->offset); 823 824 /* Write the data. */ 825 while (size > 0) { 826 if (block_size == 0) { 827 bytes_to_write = size; 828 } else { 829 /* We're sparsifying the file. */ 830 const char *p, *end; 831 int64_t block_end; 832 833 /* Skip leading zero bytes. */ 834 for (p = buff, end = buff + size; p < end; ++p) { 835 if (*p != '\0') 836 break; 837 } 838 a->offset += p - buff; 839 size -= p - buff; 840 buff = p; 841 if (size == 0) 842 break; 843 844 /* Calculate next block boundary after offset. */ 845 block_end 846 = (a->offset / block_size + 1) * block_size; 847 848 /* If the adjusted write would cross block boundary, 849 * truncate it to the block boundary. */ 850 bytes_to_write = size; 851 if (a->offset + bytes_to_write > block_end) 852 bytes_to_write = block_end - a->offset; 853 } 854 /* Seek if necessary to the specified offset. */ 855 if (a->offset != a->fd_offset) { 856 if (lseek(a->fd, a->offset, SEEK_SET) < 0) { 857 archive_set_error(&a->archive, errno, 858 "Seek failed"); 859 return (ARCHIVE_FATAL); 860 } 861 a->fd_offset = a->offset; 862 } 863 bytes_written = write(a->fd, buff, bytes_to_write); 864 if (bytes_written < 0) { 865 archive_set_error(&a->archive, errno, "Write failed"); 866 return (ARCHIVE_WARN); 867 } 868 buff += bytes_written; 869 size -= bytes_written; 870 a->total_bytes_written += bytes_written; 871 a->offset += bytes_written; 872 a->fd_offset = a->offset; 873 } 874 return (start_size - size); 875} 876 877#if defined(__APPLE__) && defined(UF_COMPRESSED) && defined(HAVE_SYS_XATTR_H)\ 878 && defined(HAVE_ZLIB_H) 879 880/* 881 * Set UF_COMPRESSED file flag. 882 * This have to be called after hfs_write_decmpfs() because if the 883 * file does not have "com.apple.decmpfs" xattr the flag is ignored. 884 */ 885static int 886hfs_set_compressed_fflag(struct archive_write_disk *a) 887{ 888 int r; 889 890 if ((r = lazy_stat(a)) != ARCHIVE_OK) 891 return (r); 892 893 a->st.st_flags |= UF_COMPRESSED; 894 if (fchflags(a->fd, a->st.st_flags) != 0) { 895 archive_set_error(&a->archive, errno, 896 "Failed to set UF_COMPRESSED file flag"); 897 return (ARCHIVE_WARN); 898 } 899 return (ARCHIVE_OK); 900} 901 902/* 903 * HFS+ Compression decmpfs 904 * 905 * +------------------------------+ +0 906 * | Magic(LE 4 bytes) | 907 * +------------------------------+ 908 * | Type(LE 4 bytes) | 909 * +------------------------------+ 910 * | Uncompressed size(LE 8 bytes)| 911 * +------------------------------+ +16 912 * | | 913 * | Compressed data | 914 * | (Placed only if Type == 3) | 915 * | | 916 * +------------------------------+ +3802 = MAX_DECMPFS_XATTR_SIZE 917 * 918 * Type is 3: decmpfs has compressed data. 919 * Type is 4: Resource Fork has compressed data. 920 */ 921/* 922 * Write "com.apple.decmpfs" 923 */ 924static int 925hfs_write_decmpfs(struct archive_write_disk *a) 926{ 927 int r; 928 uint32_t compression_type; 929 930 r = fsetxattr(a->fd, DECMPFS_XATTR_NAME, a->decmpfs_header_p, 931 a->decmpfs_attr_size, 0, 0); 932 if (r < 0) { 933 archive_set_error(&a->archive, errno, 934 "Cannot restore xattr:%s", DECMPFS_XATTR_NAME); 935 compression_type = archive_le32dec( 936 &a->decmpfs_header_p[DECMPFS_COMPRESSION_TYPE]); 937 if (compression_type == CMP_RESOURCE_FORK) 938 fremovexattr(a->fd, XATTR_RESOURCEFORK_NAME, 939 XATTR_SHOWCOMPRESSION); 940 return (ARCHIVE_WARN); 941 } 942 return (ARCHIVE_OK); 943} 944 945/* 946 * HFS+ Compression Resource Fork 947 * 948 * +-----------------------------+ 949 * | Header(260 bytes) | 950 * +-----------------------------+ 951 * | Block count(LE 4 bytes) | 952 * +-----------------------------+ --+ 953 * +-- | Offset (LE 4 bytes) | | 954 * | | [distance from Block count] | | Block 0 955 * | +-----------------------------+ | 956 * | | Compressed size(LE 4 bytes) | | 957 * | +-----------------------------+ --+ 958 * | | | 959 * | | .................. | 960 * | | | 961 * | +-----------------------------+ --+ 962 * | | Offset (LE 4 bytes) | | 963 * | +-----------------------------+ | Block (Block count -1) 964 * | | Compressed size(LE 4 bytes) | | 965 * +-> +-----------------------------+ --+ 966 * | Compressed data(n bytes) | Block 0 967 * +-----------------------------+ 968 * | | 969 * | .................. | 970 * | | 971 * +-----------------------------+ 972 * | Compressed data(n bytes) | Block (Block count -1) 973 * +-----------------------------+ 974 * | Footer(50 bytes) | 975 * +-----------------------------+ 976 * 977 */ 978/* 979 * Write the header of "com.apple.ResourceFork" 980 */ 981static int 982hfs_write_resource_fork(struct archive_write_disk *a, unsigned char *buff, 983 size_t bytes, uint32_t position) 984{ 985 int ret; 986 987 ret = fsetxattr(a->fd, XATTR_RESOURCEFORK_NAME, buff, bytes, 988 position, a->rsrc_xattr_options); 989 if (ret < 0) { 990 archive_set_error(&a->archive, errno, 991 "Cannot restore xattr: %s at %u pos %u bytes", 992 XATTR_RESOURCEFORK_NAME, 993 (unsigned)position, 994 (unsigned)bytes); 995 return (ARCHIVE_WARN); 996 } 997 a->rsrc_xattr_options &= ~XATTR_CREATE; 998 return (ARCHIVE_OK); 999} 1000 1001static int 1002hfs_write_compressed_data(struct archive_write_disk *a, size_t bytes_compressed) 1003{ 1004 int ret; 1005 1006 ret = hfs_write_resource_fork(a, a->compressed_buffer, 1007 bytes_compressed, a->compressed_rsrc_position); 1008 if (ret == ARCHIVE_OK) 1009 a->compressed_rsrc_position += bytes_compressed; 1010 return (ret); 1011} 1012 1013static int 1014hfs_write_resource_fork_header(struct archive_write_disk *a) 1015{ 1016 unsigned char *buff; 1017 uint32_t rsrc_bytes; 1018 uint32_t rsrc_header_bytes; 1019 1020 /* 1021 * Write resource fork header + block info. 1022 */ 1023 buff = a->resource_fork; 1024 rsrc_bytes = a->compressed_rsrc_position - RSRC_F_SIZE; 1025 rsrc_header_bytes = 1026 RSRC_H_SIZE + /* Header base size. */ 1027 4 + /* Block count. */ 1028 (a->decmpfs_block_count * 8);/* Block info */ 1029 archive_be32enc(buff, 0x100); 1030 archive_be32enc(buff + 4, rsrc_bytes); 1031 archive_be32enc(buff + 8, rsrc_bytes - 256); 1032 archive_be32enc(buff + 12, 0x32); 1033 memset(buff + 16, 0, 240); 1034 archive_be32enc(buff + 256, rsrc_bytes - 260); 1035 return hfs_write_resource_fork(a, buff, rsrc_header_bytes, 0); 1036} 1037 1038static size_t 1039hfs_set_resource_fork_footer(unsigned char *buff, size_t buff_size) 1040{ 1041 static const char rsrc_footer[RSRC_F_SIZE] = { 1042 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 1043 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 1044 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 1045 0x00, 0x1c, 0x00, 0x32, 0x00, 0x00, 'c', 'm', 1046 'p', 'f', 0x00, 0x00, 0x00, 0x0a, 0x00, 0x01, 1047 0xff, 0xff, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 1048 0x00, 0x00 1049 }; 1050 if (buff_size < sizeof(rsrc_footer)) 1051 return (0); 1052 memcpy(buff, rsrc_footer, sizeof(rsrc_footer)); 1053 return (sizeof(rsrc_footer)); 1054} 1055 1056static int 1057hfs_reset_compressor(struct archive_write_disk *a) 1058{ 1059 int ret; 1060 1061 if (a->stream_valid) 1062 ret = deflateReset(&a->stream); 1063 else 1064 ret = deflateInit(&a->stream, a->decmpfs_compression_level); 1065 1066 if (ret != Z_OK) { 1067 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 1068 "Failed to initialize compressor"); 1069 return (ARCHIVE_FATAL); 1070 } else 1071 a->stream_valid = 1; 1072 1073 return (ARCHIVE_OK); 1074} 1075 1076static int 1077hfs_decompress(struct archive_write_disk *a) 1078{ 1079 uint32_t *block_info; 1080 unsigned int block_count; 1081 uint32_t data_pos, data_size; 1082 ssize_t r; 1083 ssize_t bytes_written, bytes_to_write; 1084 unsigned char *b; 1085 1086 block_info = (uint32_t *)(a->resource_fork + RSRC_H_SIZE); 1087 block_count = archive_le32dec(block_info++); 1088 while (block_count--) { 1089 data_pos = RSRC_H_SIZE + archive_le32dec(block_info++); 1090 data_size = archive_le32dec(block_info++); 1091 r = fgetxattr(a->fd, XATTR_RESOURCEFORK_NAME, 1092 a->compressed_buffer, data_size, data_pos, 0); 1093 if (r != data_size) { 1094 archive_set_error(&a->archive, 1095 (r < 0)?errno:ARCHIVE_ERRNO_MISC, 1096 "Failed to read resource fork"); 1097 return (ARCHIVE_WARN); 1098 } 1099 if (a->compressed_buffer[0] == 0xff) { 1100 bytes_to_write = data_size -1; 1101 b = a->compressed_buffer + 1; 1102 } else { 1103 uLong dest_len = MAX_DECMPFS_BLOCK_SIZE; 1104 int zr; 1105 1106 zr = uncompress((Bytef *)a->uncompressed_buffer, 1107 &dest_len, a->compressed_buffer, data_size); 1108 if (zr != Z_OK) { 1109 archive_set_error(&a->archive, 1110 ARCHIVE_ERRNO_MISC, 1111 "Failed to decompress resource fork"); 1112 return (ARCHIVE_WARN); 1113 } 1114 bytes_to_write = dest_len; 1115 b = (unsigned char *)a->uncompressed_buffer; 1116 } 1117 do { 1118 bytes_written = write(a->fd, b, bytes_to_write); 1119 if (bytes_written < 0) { 1120 archive_set_error(&a->archive, errno, 1121 "Write failed"); 1122 return (ARCHIVE_WARN); 1123 } 1124 bytes_to_write -= bytes_written; 1125 b += bytes_written; 1126 } while (bytes_to_write > 0); 1127 } 1128 r = fremovexattr(a->fd, XATTR_RESOURCEFORK_NAME, 0); 1129 if (r == -1) { 1130 archive_set_error(&a->archive, errno, 1131 "Failed to remove resource fork"); 1132 return (ARCHIVE_WARN); 1133 } 1134 return (ARCHIVE_OK); 1135} 1136 1137static int 1138hfs_drive_compressor(struct archive_write_disk *a, const char *buff, 1139 size_t size) 1140{ 1141 unsigned char *buffer_compressed; 1142 size_t bytes_compressed; 1143 size_t bytes_used; 1144 int ret; 1145 1146 ret = hfs_reset_compressor(a); 1147 if (ret != ARCHIVE_OK) 1148 return (ret); 1149 1150 if (a->compressed_buffer == NULL) { 1151 size_t block_size; 1152 1153 block_size = COMPRESSED_W_SIZE + RSRC_F_SIZE + 1154 + compressBound(MAX_DECMPFS_BLOCK_SIZE); 1155 a->compressed_buffer = malloc(block_size); 1156 if (a->compressed_buffer == NULL) { 1157 archive_set_error(&a->archive, ENOMEM, 1158 "Can't allocate memory for Resource Fork"); 1159 return (ARCHIVE_FATAL); 1160 } 1161 a->compressed_buffer_size = block_size; 1162 a->compressed_buffer_remaining = block_size; 1163 } 1164 1165 buffer_compressed = a->compressed_buffer + 1166 a->compressed_buffer_size - a->compressed_buffer_remaining; 1167 a->stream.next_in = (Bytef *)(uintptr_t)(const void *)buff; 1168 a->stream.avail_in = size; 1169 a->stream.next_out = buffer_compressed; 1170 a->stream.avail_out = a->compressed_buffer_remaining; 1171 do { 1172 ret = deflate(&a->stream, Z_FINISH); 1173 switch (ret) { 1174 case Z_OK: 1175 case Z_STREAM_END: 1176 break; 1177 default: 1178 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 1179 "Failed to compress data"); 1180 return (ARCHIVE_FAILED); 1181 } 1182 } while (ret == Z_OK); 1183 bytes_compressed = a->compressed_buffer_remaining - a->stream.avail_out; 1184 1185 /* 1186 * If the compressed size is larger than the original size, 1187 * throw away compressed data, use uncompressed data instead. 1188 */ 1189 if (bytes_compressed > size) { 1190 buffer_compressed[0] = 0xFF;/* uncompressed marker. */ 1191 memcpy(buffer_compressed + 1, buff, size); 1192 bytes_compressed = size + 1; 1193 } 1194 a->compressed_buffer_remaining -= bytes_compressed; 1195 1196 /* 1197 * If the compressed size is smaller than MAX_DECMPFS_XATTR_SIZE 1198 * and the block count in the file is only one, store compressed 1199 * data to decmpfs xattr instead of the resource fork. 1200 */ 1201 if (a->decmpfs_block_count == 1 && 1202 (a->decmpfs_attr_size + bytes_compressed) 1203 <= MAX_DECMPFS_XATTR_SIZE) { 1204 archive_le32enc(&a->decmpfs_header_p[DECMPFS_COMPRESSION_TYPE], 1205 CMP_XATTR); 1206 memcpy(a->decmpfs_header_p + DECMPFS_HEADER_SIZE, 1207 buffer_compressed, bytes_compressed); 1208 a->decmpfs_attr_size += bytes_compressed; 1209 a->compressed_buffer_remaining = a->compressed_buffer_size; 1210 /* 1211 * Finish HFS+ Compression. 1212 * - Write the decmpfs xattr. 1213 * - Set the UF_COMPRESSED file flag. 1214 */ 1215 ret = hfs_write_decmpfs(a); 1216 if (ret == ARCHIVE_OK) 1217 ret = hfs_set_compressed_fflag(a); 1218 return (ret); 1219 } 1220 1221 /* Update block info. */ 1222 archive_le32enc(a->decmpfs_block_info++, 1223 a->compressed_rsrc_position_v - RSRC_H_SIZE); 1224 archive_le32enc(a->decmpfs_block_info++, bytes_compressed); 1225 a->compressed_rsrc_position_v += bytes_compressed; 1226 1227 /* 1228 * Write the compressed data to the resource fork. 1229 */ 1230 bytes_used = a->compressed_buffer_size - a->compressed_buffer_remaining; 1231 while (bytes_used >= COMPRESSED_W_SIZE) { 1232 ret = hfs_write_compressed_data(a, COMPRESSED_W_SIZE); 1233 if (ret != ARCHIVE_OK) 1234 return (ret); 1235 bytes_used -= COMPRESSED_W_SIZE; 1236 if (bytes_used > COMPRESSED_W_SIZE) 1237 memmove(a->compressed_buffer, 1238 a->compressed_buffer + COMPRESSED_W_SIZE, 1239 bytes_used); 1240 else 1241 memcpy(a->compressed_buffer, 1242 a->compressed_buffer + COMPRESSED_W_SIZE, 1243 bytes_used); 1244 } 1245 a->compressed_buffer_remaining = a->compressed_buffer_size - bytes_used; 1246 1247 /* 1248 * If the current block is the last block, write the remaining 1249 * compressed data and the resource fork footer. 1250 */ 1251 if (a->file_remaining_bytes == 0) { 1252 size_t rsrc_size; 1253 int64_t bk; 1254 1255 /* Append the resource footer. */ 1256 rsrc_size = hfs_set_resource_fork_footer( 1257 a->compressed_buffer + bytes_used, 1258 a->compressed_buffer_remaining); 1259 ret = hfs_write_compressed_data(a, bytes_used + rsrc_size); 1260 a->compressed_buffer_remaining = a->compressed_buffer_size; 1261 1262 /* If the compressed size is not enough smaller than 1263 * the uncompressed size. cancel HFS+ compression. 1264 * TODO: study a behavior of ditto utility and improve 1265 * the condition to fall back into no HFS+ compression. */ 1266 bk = HFS_BLOCKS(a->compressed_rsrc_position); 1267 bk += bk >> 7; 1268 if (bk > HFS_BLOCKS(a->filesize)) 1269 return hfs_decompress(a); 1270 /* 1271 * Write the resourcefork header. 1272 */ 1273 if (ret == ARCHIVE_OK) 1274 ret = hfs_write_resource_fork_header(a); 1275 /* 1276 * Finish HFS+ Compression. 1277 * - Write the decmpfs xattr. 1278 * - Set the UF_COMPRESSED file flag. 1279 */ 1280 if (ret == ARCHIVE_OK) 1281 ret = hfs_write_decmpfs(a); 1282 if (ret == ARCHIVE_OK) 1283 ret = hfs_set_compressed_fflag(a); 1284 } 1285 return (ret); 1286} 1287 1288static ssize_t 1289hfs_write_decmpfs_block(struct archive_write_disk *a, const char *buff, 1290 size_t size) 1291{ 1292 const char *buffer_to_write; 1293 size_t bytes_to_write; 1294 int ret; 1295 1296 if (a->decmpfs_block_count == (unsigned)-1) { 1297 void *new_block; 1298 size_t new_size; 1299 unsigned int block_count; 1300 1301 if (a->decmpfs_header_p == NULL) { 1302 new_block = malloc(MAX_DECMPFS_XATTR_SIZE 1303 + sizeof(uint32_t)); 1304 if (new_block == NULL) { 1305 archive_set_error(&a->archive, ENOMEM, 1306 "Can't allocate memory for decmpfs"); 1307 return (ARCHIVE_FATAL); 1308 } 1309 a->decmpfs_header_p = new_block; 1310 } 1311 a->decmpfs_attr_size = DECMPFS_HEADER_SIZE; 1312 archive_le32enc(&a->decmpfs_header_p[DECMPFS_COMPRESSION_MAGIC], 1313 DECMPFS_MAGIC); 1314 archive_le32enc(&a->decmpfs_header_p[DECMPFS_COMPRESSION_TYPE], 1315 CMP_RESOURCE_FORK); 1316 archive_le64enc(&a->decmpfs_header_p[DECMPFS_UNCOMPRESSED_SIZE], 1317 a->filesize); 1318 1319 /* Calculate a block count of the file. */ 1320 block_count = 1321 (a->filesize + MAX_DECMPFS_BLOCK_SIZE -1) / 1322 MAX_DECMPFS_BLOCK_SIZE; 1323 /* 1324 * Allocate buffer for resource fork. 1325 * Set up related pointers; 1326 */ 1327 new_size = 1328 RSRC_H_SIZE + /* header */ 1329 4 + /* Block count */ 1330 (block_count * sizeof(uint32_t) * 2) + 1331 RSRC_F_SIZE; /* footer */ 1332 if (new_size > a->resource_fork_allocated_size) { 1333 new_block = realloc(a->resource_fork, new_size); 1334 if (new_block == NULL) { 1335 archive_set_error(&a->archive, ENOMEM, 1336 "Can't allocate memory for ResourceFork"); 1337 return (ARCHIVE_FATAL); 1338 } 1339 a->resource_fork_allocated_size = new_size; 1340 a->resource_fork = new_block; 1341 } 1342 1343 /* Allocate uncompressed buffer */ 1344 if (a->uncompressed_buffer == NULL) { 1345 new_block = malloc(MAX_DECMPFS_BLOCK_SIZE); 1346 if (new_block == NULL) { 1347 archive_set_error(&a->archive, ENOMEM, 1348 "Can't allocate memory for decmpfs"); 1349 return (ARCHIVE_FATAL); 1350 } 1351 a->uncompressed_buffer = new_block; 1352 } 1353 a->block_remaining_bytes = MAX_DECMPFS_BLOCK_SIZE; 1354 a->file_remaining_bytes = a->filesize; 1355 a->compressed_buffer_remaining = a->compressed_buffer_size; 1356 1357 /* 1358 * Set up a resource fork. 1359 */ 1360 a->rsrc_xattr_options = XATTR_CREATE; 1361 /* Get the position where we are going to set a bunch 1362 * of block info. */ 1363 a->decmpfs_block_info = 1364 (uint32_t *)(a->resource_fork + RSRC_H_SIZE); 1365 /* Set the block count to the resource fork. */ 1366 archive_le32enc(a->decmpfs_block_info++, block_count); 1367 /* Get the position where we are going to set compressed 1368 * data. */ 1369 a->compressed_rsrc_position = 1370 RSRC_H_SIZE + 4 + (block_count * 8); 1371 a->compressed_rsrc_position_v = a->compressed_rsrc_position; 1372 a->decmpfs_block_count = block_count; 1373 } 1374 1375 /* Ignore redundant bytes. */ 1376 if (a->file_remaining_bytes == 0) 1377 return ((ssize_t)size); 1378 1379 /* Do not overrun a block size. */ 1380 if (size > a->block_remaining_bytes) 1381 bytes_to_write = a->block_remaining_bytes; 1382 else 1383 bytes_to_write = size; 1384 /* Do not overrun the file size. */ 1385 if (bytes_to_write > a->file_remaining_bytes) 1386 bytes_to_write = a->file_remaining_bytes; 1387 1388 /* For efficiency, if a copy length is full of the uncompressed 1389 * buffer size, do not copy writing data to it. */ 1390 if (bytes_to_write == MAX_DECMPFS_BLOCK_SIZE) 1391 buffer_to_write = buff; 1392 else { 1393 memcpy(a->uncompressed_buffer + 1394 MAX_DECMPFS_BLOCK_SIZE - a->block_remaining_bytes, 1395 buff, bytes_to_write); 1396 buffer_to_write = a->uncompressed_buffer; 1397 } 1398 a->block_remaining_bytes -= bytes_to_write; 1399 a->file_remaining_bytes -= bytes_to_write; 1400 1401 if (a->block_remaining_bytes == 0 || a->file_remaining_bytes == 0) { 1402 ret = hfs_drive_compressor(a, buffer_to_write, 1403 MAX_DECMPFS_BLOCK_SIZE - a->block_remaining_bytes); 1404 if (ret < 0) 1405 return (ret); 1406 a->block_remaining_bytes = MAX_DECMPFS_BLOCK_SIZE; 1407 } 1408 /* Ignore redundant bytes. */ 1409 if (a->file_remaining_bytes == 0) 1410 return ((ssize_t)size); 1411 return (bytes_to_write); 1412} 1413 1414static ssize_t 1415hfs_write_data_block(struct archive_write_disk *a, const char *buff, 1416 size_t size) 1417{ 1418 uint64_t start_size = size; 1419 ssize_t bytes_written = 0; 1420 ssize_t bytes_to_write; 1421 1422 if (size == 0) 1423 return (ARCHIVE_OK); 1424 1425 if (a->filesize == 0 || a->fd < 0) { 1426 archive_set_error(&a->archive, 0, 1427 "Attempt to write to an empty file"); 1428 return (ARCHIVE_WARN); 1429 } 1430 1431 /* If this write would run beyond the file size, truncate it. */ 1432 if (a->filesize >= 0 && (int64_t)(a->offset + size) > a->filesize) 1433 start_size = size = (size_t)(a->filesize - a->offset); 1434 1435 /* Write the data. */ 1436 while (size > 0) { 1437 bytes_to_write = size; 1438 /* Seek if necessary to the specified offset. */ 1439 if (a->offset < a->fd_offset) { 1440 /* Can't support backward move. */ 1441 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 1442 "Seek failed"); 1443 return (ARCHIVE_FATAL); 1444 } else if (a->offset > a->fd_offset) { 1445 int64_t skip = a->offset - a->fd_offset; 1446 char nullblock[1024]; 1447 1448 memset(nullblock, 0, sizeof(nullblock)); 1449 while (skip > 0) { 1450 if (skip > (int64_t)sizeof(nullblock)) 1451 bytes_written = hfs_write_decmpfs_block( 1452 a, nullblock, sizeof(nullblock)); 1453 else 1454 bytes_written = hfs_write_decmpfs_block( 1455 a, nullblock, skip); 1456 if (bytes_written < 0) { 1457 archive_set_error(&a->archive, errno, 1458 "Write failed"); 1459 return (ARCHIVE_WARN); 1460 } 1461 skip -= bytes_written; 1462 } 1463 1464 a->fd_offset = a->offset; 1465 } 1466 bytes_written = 1467 hfs_write_decmpfs_block(a, buff, bytes_to_write); 1468 if (bytes_written < 0) 1469 return (bytes_written); 1470 buff += bytes_written; 1471 size -= bytes_written; 1472 a->total_bytes_written += bytes_written; 1473 a->offset += bytes_written; 1474 a->fd_offset = a->offset; 1475 } 1476 return (start_size - size); 1477} 1478#else 1479static ssize_t 1480hfs_write_data_block(struct archive_write_disk *a, const char *buff, 1481 size_t size) 1482{ 1483 return (write_data_block(a, buff, size)); 1484} 1485#endif 1486 1487static ssize_t 1488_archive_write_disk_data_block(struct archive *_a, 1489 const void *buff, size_t size, int64_t offset) 1490{ 1491 struct archive_write_disk *a = (struct archive_write_disk *)_a; 1492 ssize_t r; 1493 1494 archive_check_magic(&a->archive, ARCHIVE_WRITE_DISK_MAGIC, 1495 ARCHIVE_STATE_DATA, "archive_write_data_block"); 1496 1497 a->offset = offset; 1498 if (a->todo & TODO_HFS_COMPRESSION) 1499 r = hfs_write_data_block(a, buff, size); 1500 else 1501 r = write_data_block(a, buff, size); 1502 if (r < ARCHIVE_OK) 1503 return (r); 1504 if ((size_t)r < size) { 1505 archive_set_error(&a->archive, 0, 1506 "Too much data: Truncating file at %ju bytes", 1507 (uintmax_t)a->filesize); 1508 return (ARCHIVE_WARN); 1509 } 1510#if ARCHIVE_VERSION_NUMBER < 3999000 1511 return (ARCHIVE_OK); 1512#else 1513 return (size); 1514#endif 1515} 1516 1517static ssize_t 1518_archive_write_disk_data(struct archive *_a, const void *buff, size_t size) 1519{ 1520 struct archive_write_disk *a = (struct archive_write_disk *)_a; 1521 1522 archive_check_magic(&a->archive, ARCHIVE_WRITE_DISK_MAGIC, 1523 ARCHIVE_STATE_DATA, "archive_write_data"); 1524 1525 if (a->todo & TODO_HFS_COMPRESSION) 1526 return (hfs_write_data_block(a, buff, size)); 1527 return (write_data_block(a, buff, size)); 1528} 1529 1530static int 1531_archive_write_disk_finish_entry(struct archive *_a) 1532{ 1533 struct archive_write_disk *a = (struct archive_write_disk *)_a; 1534 int ret = ARCHIVE_OK; 1535 1536 archive_check_magic(&a->archive, ARCHIVE_WRITE_DISK_MAGIC, 1537 ARCHIVE_STATE_HEADER | ARCHIVE_STATE_DATA, 1538 "archive_write_finish_entry"); 1539 if (a->archive.state & ARCHIVE_STATE_HEADER) 1540 return (ARCHIVE_OK); 1541 archive_clear_error(&a->archive); 1542 1543 /* Pad or truncate file to the right size. */ 1544 if (a->fd < 0) { 1545 /* There's no file. */ 1546 } else if (a->filesize < 0) { 1547 /* File size is unknown, so we can't set the size. */ 1548 } else if (a->fd_offset == a->filesize) { 1549 /* Last write ended at exactly the filesize; we're done. */ 1550 /* Hopefully, this is the common case. */ 1551#if defined(__APPLE__) && defined(UF_COMPRESSED) && defined(HAVE_ZLIB_H) 1552 } else if (a->todo & TODO_HFS_COMPRESSION) { 1553 char null_d[1024]; 1554 ssize_t r; 1555 1556 if (a->file_remaining_bytes) 1557 memset(null_d, 0, sizeof(null_d)); 1558 while (a->file_remaining_bytes) { 1559 if (a->file_remaining_bytes > sizeof(null_d)) 1560 r = hfs_write_data_block( 1561 a, null_d, sizeof(null_d)); 1562 else 1563 r = hfs_write_data_block( 1564 a, null_d, a->file_remaining_bytes); 1565 if (r < 0) 1566 return ((int)r); 1567 } 1568#endif 1569 } else { 1570#if HAVE_FTRUNCATE 1571 if (ftruncate(a->fd, a->filesize) == -1 && 1572 a->filesize == 0) { 1573 archive_set_error(&a->archive, errno, 1574 "File size could not be restored"); 1575 return (ARCHIVE_FAILED); 1576 } 1577#endif 1578 /* 1579 * Not all platforms implement the XSI option to 1580 * extend files via ftruncate. Stat() the file again 1581 * to see what happened. 1582 */ 1583 a->pst = NULL; 1584 if ((ret = lazy_stat(a)) != ARCHIVE_OK) 1585 return (ret); 1586 /* We can use lseek()/write() to extend the file if 1587 * ftruncate didn't work or isn't available. */ 1588 if (a->st.st_size < a->filesize) { 1589 const char nul = '\0'; 1590 if (lseek(a->fd, a->filesize - 1, SEEK_SET) < 0) { 1591 archive_set_error(&a->archive, errno, 1592 "Seek failed"); 1593 return (ARCHIVE_FATAL); 1594 } 1595 if (write(a->fd, &nul, 1) < 0) { 1596 archive_set_error(&a->archive, errno, 1597 "Write to restore size failed"); 1598 return (ARCHIVE_FATAL); 1599 } 1600 a->pst = NULL; 1601 } 1602 } 1603 1604 /* Restore metadata. */ 1605 1606 /* 1607 * This is specific to Mac OS X. 1608 * If the current file is an AppleDouble file, it should be 1609 * linked with the data fork file and remove it. 1610 */ 1611 if (a->todo & TODO_APPLEDOUBLE) { 1612 int r2 = fixup_appledouble(a, a->name); 1613 if (r2 == ARCHIVE_EOF) { 1614 /* The current file has been successfully linked 1615 * with the data fork file and removed. So there 1616 * is nothing to do on the current file. */ 1617 goto finish_metadata; 1618 } 1619 if (r2 < ret) ret = r2; 1620 } 1621 1622 /* 1623 * Look up the "real" UID only if we're going to need it. 1624 * TODO: the TODO_SGID condition can be dropped here, can't it? 1625 */ 1626 if (a->todo & (TODO_OWNER | TODO_SUID | TODO_SGID)) { 1627 a->uid = archive_write_disk_uid(&a->archive, 1628 archive_entry_uname(a->entry), 1629 archive_entry_uid(a->entry)); 1630 } 1631 /* Look up the "real" GID only if we're going to need it. */ 1632 /* TODO: the TODO_SUID condition can be dropped here, can't it? */ 1633 if (a->todo & (TODO_OWNER | TODO_SGID | TODO_SUID)) { 1634 a->gid = archive_write_disk_gid(&a->archive, 1635 archive_entry_gname(a->entry), 1636 archive_entry_gid(a->entry)); 1637 } 1638 1639 /* 1640 * Restore ownership before set_mode tries to restore suid/sgid 1641 * bits. If we set the owner, we know what it is and can skip 1642 * a stat() call to examine the ownership of the file on disk. 1643 */ 1644 if (a->todo & TODO_OWNER) { 1645 int r2 = set_ownership(a); 1646 if (r2 < ret) ret = r2; 1647 } 1648 1649 /* 1650 * set_mode must precede ACLs on systems such as Solaris and 1651 * FreeBSD where setting the mode implicitly clears extended ACLs 1652 */ 1653 if (a->todo & TODO_MODE) { 1654 int r2 = set_mode(a, a->mode); 1655 if (r2 < ret) ret = r2; 1656 } 1657 1658 /* 1659 * Security-related extended attributes (such as 1660 * security.capability on Linux) have to be restored last, 1661 * since they're implicitly removed by other file changes. 1662 */ 1663 if (a->todo & TODO_XATTR) { 1664 int r2 = set_xattrs(a); 1665 if (r2 < ret) ret = r2; 1666 } 1667 1668 /* 1669 * Some flags prevent file modification; they must be restored after 1670 * file contents are written. 1671 */ 1672 if (a->todo & TODO_FFLAGS) { 1673 int r2 = set_fflags(a); 1674 if (r2 < ret) ret = r2; 1675 } 1676 1677 /* 1678 * Time must follow most other metadata; 1679 * otherwise atime will get changed. 1680 */ 1681 if (a->todo & TODO_TIMES) { 1682 int r2 = set_times_from_entry(a); 1683 if (r2 < ret) ret = r2; 1684 } 1685 1686 /* 1687 * Mac extended metadata includes ACLs. 1688 */ 1689 if (a->todo & TODO_MAC_METADATA) { 1690 const void *metadata; 1691 size_t metadata_size; 1692 metadata = archive_entry_mac_metadata(a->entry, &metadata_size); 1693 if (metadata != NULL && metadata_size > 0) { 1694 int r2 = set_mac_metadata(a, archive_entry_pathname( 1695 a->entry), metadata, metadata_size); 1696 if (r2 < ret) ret = r2; 1697 } 1698 } 1699 1700 /* 1701 * ACLs must be restored after timestamps because there are 1702 * ACLs that prevent attribute changes (including time). 1703 */ 1704 if (a->todo & TODO_ACLS) { 1705 int r2; 1706#ifdef HAVE_DARWIN_ACL 1707 /* 1708 * On Mac OS, platform ACLs are stored also in mac_metadata by 1709 * the operating system. If mac_metadata is present it takes 1710 * precedence and we skip extracting libarchive NFSv4 ACLs 1711 */ 1712 const void *metadata; 1713 size_t metadata_size; 1714 metadata = archive_entry_mac_metadata(a->entry, &metadata_size); 1715 if (metadata == NULL || metadata_size == 0) { 1716#endif 1717 r2 = archive_write_disk_set_acls(&a->archive, a->fd, 1718 archive_entry_pathname(a->entry), 1719 archive_entry_acl(a->entry)); 1720 if (r2 < ret) ret = r2; 1721#ifdef HAVE_DARWIN_ACL 1722 } 1723#endif 1724 } 1725 1726finish_metadata: 1727 /* If there's an fd, we can close it now. */ 1728 if (a->fd >= 0) { 1729 close(a->fd); 1730 a->fd = -1; 1731 } 1732 /* If there's an entry, we can release it now. */ 1733 if (a->entry) { 1734 archive_entry_free(a->entry); 1735 a->entry = NULL; 1736 } 1737 a->archive.state = ARCHIVE_STATE_HEADER; 1738 return (ret); 1739} 1740 1741int 1742archive_write_disk_set_group_lookup(struct archive *_a, 1743 void *private_data, 1744 int64_t (*lookup_gid)(void *private, const char *gname, int64_t gid), 1745 void (*cleanup_gid)(void *private)) 1746{ 1747 struct archive_write_disk *a = (struct archive_write_disk *)_a; 1748 archive_check_magic(&a->archive, ARCHIVE_WRITE_DISK_MAGIC, 1749 ARCHIVE_STATE_ANY, "archive_write_disk_set_group_lookup"); 1750 1751 if (a->cleanup_gid != NULL && a->lookup_gid_data != NULL) 1752 (a->cleanup_gid)(a->lookup_gid_data); 1753 1754 a->lookup_gid = lookup_gid; 1755 a->cleanup_gid = cleanup_gid; 1756 a->lookup_gid_data = private_data; 1757 return (ARCHIVE_OK); 1758} 1759 1760int 1761archive_write_disk_set_user_lookup(struct archive *_a, 1762 void *private_data, 1763 int64_t (*lookup_uid)(void *private, const char *uname, int64_t uid), 1764 void (*cleanup_uid)(void *private)) 1765{ 1766 struct archive_write_disk *a = (struct archive_write_disk *)_a; 1767 archive_check_magic(&a->archive, ARCHIVE_WRITE_DISK_MAGIC, 1768 ARCHIVE_STATE_ANY, "archive_write_disk_set_user_lookup"); 1769 1770 if (a->cleanup_uid != NULL && a->lookup_uid_data != NULL) 1771 (a->cleanup_uid)(a->lookup_uid_data); 1772 1773 a->lookup_uid = lookup_uid; 1774 a->cleanup_uid = cleanup_uid; 1775 a->lookup_uid_data = private_data; 1776 return (ARCHIVE_OK); 1777} 1778 1779int64_t 1780archive_write_disk_gid(struct archive *_a, const char *name, int64_t id) 1781{ 1782 struct archive_write_disk *a = (struct archive_write_disk *)_a; 1783 archive_check_magic(&a->archive, ARCHIVE_WRITE_DISK_MAGIC, 1784 ARCHIVE_STATE_ANY, "archive_write_disk_gid"); 1785 if (a->lookup_gid) 1786 return (a->lookup_gid)(a->lookup_gid_data, name, id); 1787 return (id); 1788} 1789 1790int64_t 1791archive_write_disk_uid(struct archive *_a, const char *name, int64_t id) 1792{ 1793 struct archive_write_disk *a = (struct archive_write_disk *)_a; 1794 archive_check_magic(&a->archive, ARCHIVE_WRITE_DISK_MAGIC, 1795 ARCHIVE_STATE_ANY, "archive_write_disk_uid"); 1796 if (a->lookup_uid) 1797 return (a->lookup_uid)(a->lookup_uid_data, name, id); 1798 return (id); 1799} 1800 1801/* 1802 * Create a new archive_write_disk object and initialize it with global state. 1803 */ 1804struct archive * 1805archive_write_disk_new(void) 1806{ 1807 struct archive_write_disk *a; 1808 1809 a = (struct archive_write_disk *)calloc(1, sizeof(*a)); 1810 if (a == NULL) 1811 return (NULL); 1812 a->archive.magic = ARCHIVE_WRITE_DISK_MAGIC; 1813 /* We're ready to write a header immediately. */ 1814 a->archive.state = ARCHIVE_STATE_HEADER; 1815 a->archive.vtable = archive_write_disk_vtable(); 1816 a->start_time = time(NULL); 1817 /* Query and restore the umask. */ 1818 umask(a->user_umask = umask(0)); 1819#ifdef HAVE_GETEUID 1820 a->user_uid = geteuid(); 1821#endif /* HAVE_GETEUID */ 1822 if (archive_string_ensure(&a->path_safe, 512) == NULL) { 1823 free(a); 1824 return (NULL); 1825 } 1826#ifdef HAVE_ZLIB_H 1827 a->decmpfs_compression_level = 5; 1828#endif 1829 return (&a->archive); 1830} 1831 1832 1833/* 1834 * If pathname is longer than PATH_MAX, chdir to a suitable 1835 * intermediate dir and edit the path down to a shorter suffix. Note 1836 * that this routine never returns an error; if the chdir() attempt 1837 * fails for any reason, we just go ahead with the long pathname. The 1838 * object creation is likely to fail, but any error will get handled 1839 * at that time. 1840 */ 1841#if defined(HAVE_FCHDIR) && defined(PATH_MAX) 1842static void 1843edit_deep_directories(struct archive_write_disk *a) 1844{ 1845 int ret; 1846 char *tail = a->name; 1847 1848 /* If path is short, avoid the open() below. */ 1849 if (strlen(tail) < PATH_MAX) 1850 return; 1851 1852 /* Try to record our starting dir. */ 1853 a->restore_pwd = open(".", O_RDONLY | O_BINARY | O_CLOEXEC); 1854 __archive_ensure_cloexec_flag(a->restore_pwd); 1855 if (a->restore_pwd < 0) 1856 return; 1857 1858 /* As long as the path is too long... */ 1859 while (strlen(tail) >= PATH_MAX) { 1860 /* Locate a dir prefix shorter than PATH_MAX. */ 1861 tail += PATH_MAX - 8; 1862 while (tail > a->name && *tail != '/') 1863 tail--; 1864 /* Exit if we find a too-long path component. */ 1865 if (tail <= a->name) 1866 return; 1867 /* Create the intermediate dir and chdir to it. */ 1868 *tail = '\0'; /* Terminate dir portion */ 1869 ret = create_dir(a, a->name); 1870 if (ret == ARCHIVE_OK && chdir(a->name) != 0) 1871 ret = ARCHIVE_FAILED; 1872 *tail = '/'; /* Restore the / we removed. */ 1873 if (ret != ARCHIVE_OK) 1874 return; 1875 tail++; 1876 /* The chdir() succeeded; we've now shortened the path. */ 1877 a->name = tail; 1878 } 1879 return; 1880} 1881#endif 1882 1883/* 1884 * The main restore function. 1885 */ 1886static int 1887restore_entry(struct archive_write_disk *a) 1888{ 1889 int ret = ARCHIVE_OK, en; 1890 1891 if (a->flags & ARCHIVE_EXTRACT_UNLINK && !S_ISDIR(a->mode)) { 1892 /* 1893 * TODO: Fix this. Apparently, there are platforms 1894 * that still allow root to hose the entire filesystem 1895 * by unlinking a dir. The S_ISDIR() test above 1896 * prevents us from using unlink() here if the new 1897 * object is a dir, but that doesn't mean the old 1898 * object isn't a dir. 1899 */ 1900 if (a->flags & ARCHIVE_EXTRACT_CLEAR_NOCHANGE_FFLAGS) 1901 (void)clear_nochange_fflags(a); 1902 if (unlink(a->name) == 0) { 1903 /* We removed it, reset cached stat. */ 1904 a->pst = NULL; 1905 } else if (errno == ENOENT) { 1906 /* File didn't exist, that's just as good. */ 1907 } else if (rmdir(a->name) == 0) { 1908 /* It was a dir, but now it's gone. */ 1909 a->pst = NULL; 1910 } else { 1911 /* We tried, but couldn't get rid of it. */ 1912 archive_set_error(&a->archive, errno, 1913 "Could not unlink"); 1914 return(ARCHIVE_FAILED); 1915 } 1916 } 1917 1918 /* Try creating it first; if this fails, we'll try to recover. */ 1919 en = create_filesystem_object(a); 1920 1921 if ((en == ENOTDIR || en == ENOENT) 1922 && !(a->flags & ARCHIVE_EXTRACT_NO_AUTODIR)) { 1923 /* If the parent dir doesn't exist, try creating it. */ 1924 create_parent_dir(a, a->name); 1925 /* Now try to create the object again. */ 1926 en = create_filesystem_object(a); 1927 } 1928 1929 if ((en == ENOENT) && (archive_entry_hardlink(a->entry) != NULL)) { 1930 archive_set_error(&a->archive, en, 1931 "Hard-link target '%s' does not exist.", 1932 archive_entry_hardlink(a->entry)); 1933 return (ARCHIVE_FAILED); 1934 } 1935 1936 if ((en == EISDIR || en == EEXIST) 1937 && (a->flags & ARCHIVE_EXTRACT_NO_OVERWRITE)) { 1938 /* If we're not overwriting, we're done. */ 1939 archive_entry_unset_size(a->entry); 1940 return (ARCHIVE_OK); 1941 } 1942 1943 /* 1944 * Some platforms return EISDIR if you call 1945 * open(O_WRONLY | O_EXCL | O_CREAT) on a directory, some 1946 * return EEXIST. POSIX is ambiguous, requiring EISDIR 1947 * for open(O_WRONLY) on a dir and EEXIST for open(O_EXCL | O_CREAT) 1948 * on an existing item. 1949 */ 1950 if (en == EISDIR) { 1951 /* A dir is in the way of a non-dir, rmdir it. */ 1952 if (rmdir(a->name) != 0) { 1953 archive_set_error(&a->archive, errno, 1954 "Can't remove already-existing dir"); 1955 return (ARCHIVE_FAILED); 1956 } 1957 a->pst = NULL; 1958 /* Try again. */ 1959 en = create_filesystem_object(a); 1960 } else if (en == EEXIST) { 1961 /* 1962 * We know something is in the way, but we don't know what; 1963 * we need to find out before we go any further. 1964 */ 1965 int r = 0; 1966 /* 1967 * The SECURE_SYMLINKS logic has already removed a 1968 * symlink to a dir if the client wants that. So 1969 * follow the symlink if we're creating a dir. 1970 */ 1971 if (S_ISDIR(a->mode)) 1972 r = stat(a->name, &a->st); 1973 /* 1974 * If it's not a dir (or it's a broken symlink), 1975 * then don't follow it. 1976 */ 1977 if (r != 0 || !S_ISDIR(a->mode)) 1978 r = lstat(a->name, &a->st); 1979 if (r != 0) { 1980 archive_set_error(&a->archive, errno, 1981 "Can't stat existing object"); 1982 return (ARCHIVE_FAILED); 1983 } 1984 1985 /* 1986 * NO_OVERWRITE_NEWER doesn't apply to directories. 1987 */ 1988 if ((a->flags & ARCHIVE_EXTRACT_NO_OVERWRITE_NEWER) 1989 && !S_ISDIR(a->st.st_mode)) { 1990 if (!older(&(a->st), a->entry)) { 1991 archive_entry_unset_size(a->entry); 1992 return (ARCHIVE_OK); 1993 } 1994 } 1995 1996 /* If it's our archive, we're done. */ 1997 if (a->skip_file_set && 1998 a->st.st_dev == (dev_t)a->skip_file_dev && 1999 a->st.st_ino == (ino_t)a->skip_file_ino) { 2000 archive_set_error(&a->archive, 0, 2001 "Refusing to overwrite archive"); 2002 return (ARCHIVE_FAILED); 2003 } 2004 2005 if (!S_ISDIR(a->st.st_mode)) { 2006 /* A non-dir is in the way, unlink it. */ 2007 if (a->flags & ARCHIVE_EXTRACT_CLEAR_NOCHANGE_FFLAGS) 2008 (void)clear_nochange_fflags(a); 2009 if (unlink(a->name) != 0) { 2010 archive_set_error(&a->archive, errno, 2011 "Can't unlink already-existing object"); 2012 return (ARCHIVE_FAILED); 2013 } 2014 a->pst = NULL; 2015 /* Try again. */ 2016 en = create_filesystem_object(a); 2017 } else if (!S_ISDIR(a->mode)) { 2018 /* A dir is in the way of a non-dir, rmdir it. */ 2019 if (a->flags & ARCHIVE_EXTRACT_CLEAR_NOCHANGE_FFLAGS) 2020 (void)clear_nochange_fflags(a); 2021 if (rmdir(a->name) != 0) { 2022 archive_set_error(&a->archive, errno, 2023 "Can't replace existing directory with non-directory"); 2024 return (ARCHIVE_FAILED); 2025 } 2026 /* Try again. */ 2027 en = create_filesystem_object(a); 2028 } else { 2029 /* 2030 * There's a dir in the way of a dir. Don't 2031 * waste time with rmdir()/mkdir(), just fix 2032 * up the permissions on the existing dir. 2033 * Note that we don't change perms on existing 2034 * dirs unless _EXTRACT_PERM is specified. 2035 */ 2036 if ((a->mode != a->st.st_mode) 2037 && (a->todo & TODO_MODE_FORCE)) 2038 a->deferred |= (a->todo & TODO_MODE); 2039 /* Ownership doesn't need deferred fixup. */ 2040 en = 0; /* Forget the EEXIST. */ 2041 } 2042 } 2043 2044 if (en) { 2045 /* Everything failed; give up here. */ 2046 if ((&a->archive)->error == NULL) 2047 archive_set_error(&a->archive, en, "Can't create '%s'", 2048 a->name); 2049 return (ARCHIVE_FAILED); 2050 } 2051 2052 a->pst = NULL; /* Cached stat data no longer valid. */ 2053 return (ret); 2054} 2055 2056/* 2057 * Returns 0 if creation succeeds, or else returns errno value from 2058 * the failed system call. Note: This function should only ever perform 2059 * a single system call. 2060 */ 2061static int 2062create_filesystem_object(struct archive_write_disk *a) 2063{ 2064 /* Create the entry. */ 2065 const char *linkname; 2066 mode_t final_mode, mode; 2067 int r; 2068 /* these for check_symlinks_fsobj */ 2069 char *linkname_copy; /* non-const copy of linkname */ 2070 struct archive_string error_string; 2071 int error_number; 2072 2073 /* We identify hard/symlinks according to the link names. */ 2074 /* Since link(2) and symlink(2) don't handle modes, we're done here. */ 2075 linkname = archive_entry_hardlink(a->entry); 2076 if (linkname != NULL) { 2077#if !HAVE_LINK 2078 return (EPERM); 2079#else 2080 archive_string_init(&error_string); 2081 linkname_copy = strdup(linkname); 2082 if (linkname_copy == NULL) { 2083 return (EPERM); 2084 } 2085 /* 2086 * TODO: consider using the cleaned-up path as the link 2087 * target? 2088 */ 2089 r = cleanup_pathname_fsobj(linkname_copy, &error_number, 2090 &error_string, a->flags); 2091 if (r != ARCHIVE_OK) { 2092 archive_set_error(&a->archive, error_number, "%s", 2093 error_string.s); 2094 free(linkname_copy); 2095 archive_string_free(&error_string); 2096 /* 2097 * EPERM is more appropriate than error_number for our 2098 * callers 2099 */ 2100 return (EPERM); 2101 } 2102 r = check_symlinks_fsobj(linkname_copy, &error_number, 2103 &error_string, a->flags); 2104 if (r != ARCHIVE_OK) { 2105 archive_set_error(&a->archive, error_number, "%s", 2106 error_string.s); 2107 free(linkname_copy); 2108 archive_string_free(&error_string); 2109 /* 2110 * EPERM is more appropriate than error_number for our 2111 * callers 2112 */ 2113 return (EPERM); 2114 } 2115 free(linkname_copy); 2116 archive_string_free(&error_string); 2117 r = link(linkname, a->name) ? errno : 0; 2118 /* 2119 * New cpio and pax formats allow hardlink entries 2120 * to carry data, so we may have to open the file 2121 * for hardlink entries. 2122 * 2123 * If the hardlink was successfully created and 2124 * the archive doesn't have carry data for it, 2125 * consider it to be non-authoritative for meta data. 2126 * This is consistent with GNU tar and BSD pax. 2127 * If the hardlink does carry data, let the last 2128 * archive entry decide ownership. 2129 */ 2130 if (r == 0 && a->filesize <= 0) { 2131 a->todo = 0; 2132 a->deferred = 0; 2133 } else if (r == 0 && a->filesize > 0) { 2134 a->fd = open(a->name, O_WRONLY | O_TRUNC | O_BINARY 2135 | O_CLOEXEC | O_NOFOLLOW); 2136 __archive_ensure_cloexec_flag(a->fd); 2137 if (a->fd < 0) 2138 r = errno; 2139 } 2140 return (r); 2141#endif 2142 } 2143 linkname = archive_entry_symlink(a->entry); 2144 if (linkname != NULL) { 2145#if HAVE_SYMLINK 2146 return symlink(linkname, a->name) ? errno : 0; 2147#else 2148 return (EPERM); 2149#endif 2150 } 2151 2152 /* 2153 * The remaining system calls all set permissions, so let's 2154 * try to take advantage of that to avoid an extra chmod() 2155 * call. (Recall that umask is set to zero right now!) 2156 */ 2157 2158 /* Mode we want for the final restored object (w/o file type bits). */ 2159 final_mode = a->mode & 07777; 2160 /* 2161 * The mode that will actually be restored in this step. Note 2162 * that SUID, SGID, etc, require additional work to ensure 2163 * security, so we never restore them at this point. 2164 */ 2165 mode = final_mode & 0777 & ~a->user_umask; 2166 2167 switch (a->mode & AE_IFMT) { 2168 default: 2169 /* POSIX requires that we fall through here. */ 2170 /* FALLTHROUGH */ 2171 case AE_IFREG: 2172 a->fd = open(a->name, 2173 O_WRONLY | O_CREAT | O_EXCL | O_BINARY | O_CLOEXEC, mode); 2174 __archive_ensure_cloexec_flag(a->fd); 2175 r = (a->fd < 0); 2176 break; 2177 case AE_IFCHR: 2178#ifdef HAVE_MKNOD 2179 /* Note: we use AE_IFCHR for the case label, and 2180 * S_IFCHR for the mknod() call. This is correct. */ 2181 r = mknod(a->name, mode | S_IFCHR, 2182 archive_entry_rdev(a->entry)); 2183 break; 2184#else 2185 /* TODO: Find a better way to warn about our inability 2186 * to restore a char device node. */ 2187 return (EINVAL); 2188#endif /* HAVE_MKNOD */ 2189 case AE_IFBLK: 2190#ifdef HAVE_MKNOD 2191 r = mknod(a->name, mode | S_IFBLK, 2192 archive_entry_rdev(a->entry)); 2193 break; 2194#else 2195 /* TODO: Find a better way to warn about our inability 2196 * to restore a block device node. */ 2197 return (EINVAL); 2198#endif /* HAVE_MKNOD */ 2199 case AE_IFDIR: 2200 mode = (mode | MINIMUM_DIR_MODE) & MAXIMUM_DIR_MODE; 2201 r = mkdir(a->name, mode); 2202 if (r == 0) { 2203 /* Defer setting dir times. */ 2204 a->deferred |= (a->todo & TODO_TIMES); 2205 a->todo &= ~TODO_TIMES; 2206 /* Never use an immediate chmod(). */ 2207 /* We can't avoid the chmod() entirely if EXTRACT_PERM 2208 * because of SysV SGID inheritance. */ 2209 if ((mode != final_mode) 2210 || (a->flags & ARCHIVE_EXTRACT_PERM)) 2211 a->deferred |= (a->todo & TODO_MODE); 2212 a->todo &= ~TODO_MODE; 2213 } 2214 break; 2215 case AE_IFIFO: 2216#ifdef HAVE_MKFIFO 2217 r = mkfifo(a->name, mode); 2218 break; 2219#else 2220 /* TODO: Find a better way to warn about our inability 2221 * to restore a fifo. */ 2222 return (EINVAL); 2223#endif /* HAVE_MKFIFO */ 2224 } 2225 2226 /* All the system calls above set errno on failure. */ 2227 if (r) 2228 return (errno); 2229 2230 /* If we managed to set the final mode, we've avoided a chmod(). */ 2231 if (mode == final_mode) 2232 a->todo &= ~TODO_MODE; 2233 return (0); 2234} 2235 2236/* 2237 * Cleanup function for archive_extract. Mostly, this involves processing 2238 * the fixup list, which is used to address a number of problems: 2239 * * Dir permissions might prevent us from restoring a file in that 2240 * dir, so we restore the dir with minimum 0700 permissions first, 2241 * then correct the mode at the end. 2242 * * Similarly, the act of restoring a file touches the directory 2243 * and changes the timestamp on the dir, so we have to touch-up dir 2244 * timestamps at the end as well. 2245 * * Some file flags can interfere with the restore by, for example, 2246 * preventing the creation of hardlinks to those files. 2247 * * Mac OS extended metadata includes ACLs, so must be deferred on dirs. 2248 * 2249 * Note that tar/cpio do not require that archives be in a particular 2250 * order; there is no way to know when the last file has been restored 2251 * within a directory, so there's no way to optimize the memory usage 2252 * here by fixing up the directory any earlier than the 2253 * end-of-archive. 2254 * 2255 * XXX TODO: Directory ACLs should be restored here, for the same 2256 * reason we set directory perms here. XXX 2257 */ 2258static int 2259_archive_write_disk_close(struct archive *_a) 2260{ 2261 struct archive_write_disk *a = (struct archive_write_disk *)_a; 2262 struct fixup_entry *next, *p; 2263 int ret; 2264 2265 archive_check_magic(&a->archive, ARCHIVE_WRITE_DISK_MAGIC, 2266 ARCHIVE_STATE_HEADER | ARCHIVE_STATE_DATA, 2267 "archive_write_disk_close"); 2268 ret = _archive_write_disk_finish_entry(&a->archive); 2269 2270 /* Sort dir list so directories are fixed up in depth-first order. */ 2271 p = sort_dir_list(a->fixup_list); 2272 2273 while (p != NULL) { 2274 a->pst = NULL; /* Mark stat cache as out-of-date. */ 2275 if (p->fixup & TODO_TIMES) { 2276 set_times(a, -1, p->mode, p->name, 2277 p->atime, p->atime_nanos, 2278 p->birthtime, p->birthtime_nanos, 2279 p->mtime, p->mtime_nanos, 2280 p->ctime, p->ctime_nanos); 2281 } 2282 if (p->fixup & TODO_MODE_BASE) 2283 chmod(p->name, p->mode); 2284 if (p->fixup & TODO_ACLS) 2285#ifdef HAVE_DARWIN_ACL 2286 if (p->mac_metadata == NULL || 2287 p->mac_metadata_size == 0) 2288#endif 2289 archive_write_disk_set_acls(&a->archive, 2290 -1, p->name, &p->acl); 2291 if (p->fixup & TODO_FFLAGS) 2292 set_fflags_platform(a, -1, p->name, 2293 p->mode, p->fflags_set, 0); 2294 if (p->fixup & TODO_MAC_METADATA) 2295 set_mac_metadata(a, p->name, p->mac_metadata, 2296 p->mac_metadata_size); 2297 next = p->next; 2298 archive_acl_clear(&p->acl); 2299 free(p->mac_metadata); 2300 free(p->name); 2301 free(p); 2302 p = next; 2303 } 2304 a->fixup_list = NULL; 2305 return (ret); 2306} 2307 2308static int 2309_archive_write_disk_free(struct archive *_a) 2310{ 2311 struct archive_write_disk *a; 2312 int ret; 2313 if (_a == NULL) 2314 return (ARCHIVE_OK); 2315 archive_check_magic(_a, ARCHIVE_WRITE_DISK_MAGIC, 2316 ARCHIVE_STATE_ANY | ARCHIVE_STATE_FATAL, "archive_write_disk_free"); 2317 a = (struct archive_write_disk *)_a; 2318 ret = _archive_write_disk_close(&a->archive); 2319 archive_write_disk_set_group_lookup(&a->archive, NULL, NULL, NULL); 2320 archive_write_disk_set_user_lookup(&a->archive, NULL, NULL, NULL); 2321 if (a->entry) 2322 archive_entry_free(a->entry); 2323 archive_string_free(&a->_name_data); 2324 archive_string_free(&a->archive.error_string); 2325 archive_string_free(&a->path_safe); 2326 a->archive.magic = 0; 2327 __archive_clean(&a->archive); 2328 free(a->decmpfs_header_p); 2329 free(a->resource_fork); 2330 free(a->compressed_buffer); 2331 free(a->uncompressed_buffer); 2332#if defined(__APPLE__) && defined(UF_COMPRESSED) && defined(HAVE_SYS_XATTR_H)\ 2333 && defined(HAVE_ZLIB_H) 2334 if (a->stream_valid) { 2335 switch (deflateEnd(&a->stream)) { 2336 case Z_OK: 2337 break; 2338 default: 2339 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 2340 "Failed to clean up compressor"); 2341 ret = ARCHIVE_FATAL; 2342 break; 2343 } 2344 } 2345#endif 2346 free(a); 2347 return (ret); 2348} 2349 2350/* 2351 * Simple O(n log n) merge sort to order the fixup list. In 2352 * particular, we want to restore dir timestamps depth-first. 2353 */ 2354static struct fixup_entry * 2355sort_dir_list(struct fixup_entry *p) 2356{ 2357 struct fixup_entry *a, *b, *t; 2358 2359 if (p == NULL) 2360 return (NULL); 2361 /* A one-item list is already sorted. */ 2362 if (p->next == NULL) 2363 return (p); 2364 2365 /* Step 1: split the list. */ 2366 t = p; 2367 a = p->next->next; 2368 while (a != NULL) { 2369 /* Step a twice, t once. */ 2370 a = a->next; 2371 if (a != NULL) 2372 a = a->next; 2373 t = t->next; 2374 } 2375 /* Now, t is at the mid-point, so break the list here. */ 2376 b = t->next; 2377 t->next = NULL; 2378 a = p; 2379 2380 /* Step 2: Recursively sort the two sub-lists. */ 2381 a = sort_dir_list(a); 2382 b = sort_dir_list(b); 2383 2384 /* Step 3: Merge the returned lists. */ 2385 /* Pick the first element for the merged list. */ 2386 if (strcmp(a->name, b->name) > 0) { 2387 t = p = a; 2388 a = a->next; 2389 } else { 2390 t = p = b; 2391 b = b->next; 2392 } 2393 2394 /* Always put the later element on the list first. */ 2395 while (a != NULL && b != NULL) { 2396 if (strcmp(a->name, b->name) > 0) { 2397 t->next = a; 2398 a = a->next; 2399 } else { 2400 t->next = b; 2401 b = b->next; 2402 } 2403 t = t->next; 2404 } 2405 2406 /* Only one list is non-empty, so just splice it on. */ 2407 if (a != NULL) 2408 t->next = a; 2409 if (b != NULL) 2410 t->next = b; 2411 2412 return (p); 2413} 2414 2415/* 2416 * Returns a new, initialized fixup entry. 2417 * 2418 * TODO: Reduce the memory requirements for this list by using a tree 2419 * structure rather than a simple list of names. 2420 */ 2421static struct fixup_entry * 2422new_fixup(struct archive_write_disk *a, const char *pathname) 2423{ 2424 struct fixup_entry *fe; 2425 2426 fe = (struct fixup_entry *)calloc(1, sizeof(struct fixup_entry)); 2427 if (fe == NULL) { 2428 archive_set_error(&a->archive, ENOMEM, 2429 "Can't allocate memory for a fixup"); 2430 return (NULL); 2431 } 2432 fe->next = a->fixup_list; 2433 a->fixup_list = fe; 2434 fe->fixup = 0; 2435 fe->name = strdup(pathname); 2436 return (fe); 2437} 2438 2439/* 2440 * Returns a fixup structure for the current entry. 2441 */ 2442static struct fixup_entry * 2443current_fixup(struct archive_write_disk *a, const char *pathname) 2444{ 2445 if (a->current_fixup == NULL) 2446 a->current_fixup = new_fixup(a, pathname); 2447 return (a->current_fixup); 2448} 2449 2450/* Error helper for new *_fsobj functions */ 2451static void 2452fsobj_error(int *a_eno, struct archive_string *a_estr, 2453 int err, const char *errstr, const char *path) 2454{ 2455 if (a_eno) 2456 *a_eno = err; 2457 if (a_estr) 2458 archive_string_sprintf(a_estr, errstr, path); 2459} 2460 2461/* 2462 * TODO: Someday, integrate this with the deep dir support; they both 2463 * scan the path and both can be optimized by comparing against other 2464 * recent paths. 2465 */ 2466/* TODO: Extend this to support symlinks on Windows Vista and later. */ 2467 2468/* 2469 * Checks the given path to see if any elements along it are symlinks. Returns 2470 * ARCHIVE_OK if there are none, otherwise puts an error in errmsg. 2471 */ 2472static int 2473check_symlinks_fsobj(char *path, int *a_eno, struct archive_string *a_estr, 2474 int flags) 2475{ 2476#if !defined(HAVE_LSTAT) 2477 /* Platform doesn't have lstat, so we can't look for symlinks. */ 2478 (void)path; /* UNUSED */ 2479 (void)error_number; /* UNUSED */ 2480 (void)error_string; /* UNUSED */ 2481 (void)flags; /* UNUSED */ 2482 return (ARCHIVE_OK); 2483#else 2484 int res = ARCHIVE_OK; 2485 char *tail; 2486 char *head; 2487 int last; 2488 char c; 2489 int r; 2490 struct stat st; 2491 int restore_pwd; 2492 2493 /* Nothing to do here if name is empty */ 2494 if(path[0] == '\0') 2495 return (ARCHIVE_OK); 2496 2497 /* 2498 * Guard against symlink tricks. Reject any archive entry whose 2499 * destination would be altered by a symlink. 2500 * 2501 * Walk the filename in chunks separated by '/'. For each segment: 2502 * - if it doesn't exist, continue 2503 * - if it's symlink, abort or remove it 2504 * - if it's a directory and it's not the last chunk, cd into it 2505 * As we go: 2506 * head points to the current (relative) path 2507 * tail points to the temporary \0 terminating the segment we're 2508 * currently examining 2509 * c holds what used to be in *tail 2510 * last is 1 if this is the last tail 2511 */ 2512 restore_pwd = open(".", O_RDONLY | O_BINARY | O_CLOEXEC); 2513 __archive_ensure_cloexec_flag(restore_pwd); 2514 if (restore_pwd < 0) 2515 return (ARCHIVE_FATAL); 2516 head = path; 2517 tail = path; 2518 last = 0; 2519 /* TODO: reintroduce a safe cache here? */ 2520 /* Skip the root directory if the path is absolute. */ 2521 if(tail == path && tail[0] == '/') 2522 ++tail; 2523 /* Keep going until we've checked the entire name. 2524 * head, tail, path all alias the same string, which is 2525 * temporarily zeroed at tail, so be careful restoring the 2526 * stashed (c=tail[0]) for error messages. 2527 * Exiting the loop with break is okay; continue is not. 2528 */ 2529 while (!last) { 2530 /* 2531 * Skip the separator we just consumed, plus any adjacent ones 2532 */ 2533 while (*tail == '/') 2534 ++tail; 2535 /* Skip the next path element. */ 2536 while (*tail != '\0' && *tail != '/') 2537 ++tail; 2538 /* is this the last path component? */ 2539 last = (tail[0] == '\0') || (tail[0] == '/' && tail[1] == '\0'); 2540 /* temporarily truncate the string here */ 2541 c = tail[0]; 2542 tail[0] = '\0'; 2543 /* Check that we haven't hit a symlink. */ 2544 r = lstat(head, &st); 2545 if (r != 0) { 2546 tail[0] = c; 2547 /* We've hit a dir that doesn't exist; stop now. */ 2548 if (errno == ENOENT) { 2549 break; 2550 } else { 2551 /* 2552 * Treat any other error as fatal - best to be 2553 * paranoid here. 2554 * Note: This effectively disables deep 2555 * directory support when security checks are 2556 * enabled. Otherwise, very long pathnames that 2557 * trigger an error here could evade the 2558 * sandbox. 2559 * TODO: We could do better, but it would 2560 * probably require merging the symlink checks 2561 * with the deep-directory editing. 2562 */ 2563 fsobj_error(a_eno, a_estr, errno, 2564 "Could not stat %s", path); 2565 res = ARCHIVE_FAILED; 2566 break; 2567 } 2568 } else if (S_ISDIR(st.st_mode)) { 2569 if (!last) { 2570 if (chdir(head) != 0) { 2571 tail[0] = c; 2572 fsobj_error(a_eno, a_estr, errno, 2573 "Could not chdir %s", path); 2574 res = (ARCHIVE_FATAL); 2575 break; 2576 } 2577 /* Our view is now from inside this dir: */ 2578 head = tail + 1; 2579 } 2580 } else if (S_ISLNK(st.st_mode)) { 2581 if (last) { 2582 /* 2583 * Last element is symlink; remove it 2584 * so we can overwrite it with the 2585 * item being extracted. 2586 */ 2587 if (unlink(head)) { 2588 tail[0] = c; 2589 fsobj_error(a_eno, a_estr, errno, 2590 "Could not remove symlink %s", 2591 path); 2592 res = ARCHIVE_FAILED; 2593 break; 2594 } 2595 /* 2596 * Even if we did remove it, a warning 2597 * is in order. The warning is silly, 2598 * though, if we're just replacing one 2599 * symlink with another symlink. 2600 */ 2601 tail[0] = c; 2602 /* 2603 * FIXME: not sure how important this is to 2604 * restore 2605 */ 2606 /* 2607 if (!S_ISLNK(path)) { 2608 fsobj_error(a_eno, a_estr, 0, 2609 "Removing symlink %s", path); 2610 } 2611 */ 2612 /* Symlink gone. No more problem! */ 2613 res = ARCHIVE_OK; 2614 break; 2615 } else if (flags & ARCHIVE_EXTRACT_UNLINK) { 2616 /* User asked us to remove problems. */ 2617 if (unlink(head) != 0) { 2618 tail[0] = c; 2619 fsobj_error(a_eno, a_estr, 0, 2620 "Cannot remove intervening " 2621 "symlink %s", path); 2622 res = ARCHIVE_FAILED; 2623 break; 2624 } 2625 tail[0] = c; 2626 } else if ((flags & 2627 ARCHIVE_EXTRACT_SECURE_SYMLINKS) == 0) { 2628 /* 2629 * We are not the last element and we want to 2630 * follow symlinks if they are a directory. 2631 * 2632 * This is needed to extract hardlinks over 2633 * symlinks. 2634 */ 2635 r = stat(head, &st); 2636 if (r != 0) { 2637 tail[0] = c; 2638 if (errno == ENOENT) { 2639 break; 2640 } else { 2641 fsobj_error(a_eno, a_estr, 2642 errno, 2643 "Could not stat %s", path); 2644 res = (ARCHIVE_FAILED); 2645 break; 2646 } 2647 } else if (S_ISDIR(st.st_mode)) { 2648 if (chdir(head) != 0) { 2649 tail[0] = c; 2650 fsobj_error(a_eno, a_estr, 2651 errno, 2652 "Could not chdir %s", path); 2653 res = (ARCHIVE_FATAL); 2654 break; 2655 } 2656 /* 2657 * Our view is now from inside 2658 * this dir: 2659 */ 2660 head = tail + 1; 2661 } else { 2662 tail[0] = c; 2663 fsobj_error(a_eno, a_estr, 0, 2664 "Cannot extract through " 2665 "symlink %s", path); 2666 res = ARCHIVE_FAILED; 2667 break; 2668 } 2669 } else { 2670 tail[0] = c; 2671 fsobj_error(a_eno, a_estr, 0, 2672 "Cannot extract through symlink %s", path); 2673 res = ARCHIVE_FAILED; 2674 break; 2675 } 2676 } 2677 /* be sure to always maintain this */ 2678 tail[0] = c; 2679 if (tail[0] != '\0') 2680 tail++; /* Advance to the next segment. */ 2681 } 2682 /* Catches loop exits via break */ 2683 tail[0] = c; 2684#ifdef HAVE_FCHDIR 2685 /* If we changed directory above, restore it here. */ 2686 if (restore_pwd >= 0) { 2687 r = fchdir(restore_pwd); 2688 if (r != 0) { 2689 fsobj_error(a_eno, a_estr, errno, 2690 "chdir() failure", ""); 2691 } 2692 close(restore_pwd); 2693 restore_pwd = -1; 2694 if (r != 0) { 2695 res = (ARCHIVE_FATAL); 2696 } 2697 } 2698#endif 2699 /* TODO: reintroduce a safe cache here? */ 2700 return res; 2701#endif 2702} 2703 2704/* 2705 * Check a->name for symlinks, returning ARCHIVE_OK if its clean, otherwise 2706 * calls archive_set_error and returns ARCHIVE_{FATAL,FAILED} 2707 */ 2708static int 2709check_symlinks(struct archive_write_disk *a) 2710{ 2711 struct archive_string error_string; 2712 int error_number; 2713 int rc; 2714 archive_string_init(&error_string); 2715 rc = check_symlinks_fsobj(a->name, &error_number, &error_string, 2716 a->flags); 2717 if (rc != ARCHIVE_OK) { 2718 archive_set_error(&a->archive, error_number, "%s", 2719 error_string.s); 2720 } 2721 archive_string_free(&error_string); 2722 a->pst = NULL; /* to be safe */ 2723 return rc; 2724} 2725 2726 2727#if defined(__CYGWIN__) 2728/* 2729 * 1. Convert a path separator from '\' to '/' . 2730 * We shouldn't check multibyte character directly because some 2731 * character-set have been using the '\' character for a part of 2732 * its multibyte character code. 2733 * 2. Replace unusable characters in Windows with underscore('_'). 2734 * See also : http://msdn.microsoft.com/en-us/library/aa365247.aspx 2735 */ 2736static void 2737cleanup_pathname_win(char *path) 2738{ 2739 wchar_t wc; 2740 char *p; 2741 size_t alen, l; 2742 int mb, complete, utf8; 2743 2744 alen = 0; 2745 mb = 0; 2746 complete = 1; 2747 utf8 = (strcmp(nl_langinfo(CODESET), "UTF-8") == 0)? 1: 0; 2748 for (p = path; *p != '\0'; p++) { 2749 ++alen; 2750 if (*p == '\\') { 2751 /* If previous byte is smaller than 128, 2752 * this is not second byte of multibyte characters, 2753 * so we can replace '\' with '/'. */ 2754 if (utf8 || !mb) 2755 *p = '/'; 2756 else 2757 complete = 0;/* uncompleted. */ 2758 } else if (*(unsigned char *)p > 127) 2759 mb = 1; 2760 else 2761 mb = 0; 2762 /* Rewrite the path name if its next character is unusable. */ 2763 if (*p == ':' || *p == '*' || *p == '?' || *p == '"' || 2764 *p == '<' || *p == '>' || *p == '|') 2765 *p = '_'; 2766 } 2767 if (complete) 2768 return; 2769 2770 /* 2771 * Convert path separator in wide-character. 2772 */ 2773 p = path; 2774 while (*p != '\0' && alen) { 2775 l = mbtowc(&wc, p, alen); 2776 if (l == (size_t)-1) { 2777 while (*p != '\0') { 2778 if (*p == '\\') 2779 *p = '/'; 2780 ++p; 2781 } 2782 break; 2783 } 2784 if (l == 1 && wc == L'\\') 2785 *p = '/'; 2786 p += l; 2787 alen -= l; 2788 } 2789} 2790#endif 2791 2792/* 2793 * Canonicalize the pathname. In particular, this strips duplicate 2794 * '/' characters, '.' elements, and trailing '/'. It also raises an 2795 * error for an empty path, a trailing '..', (if _SECURE_NODOTDOT is 2796 * set) any '..' in the path or (if ARCHIVE_EXTRACT_SECURE_NOABSOLUTEPATHS 2797 * is set) if the path is absolute. 2798 */ 2799static int 2800cleanup_pathname_fsobj(char *path, int *a_eno, struct archive_string *a_estr, 2801 int flags) 2802{ 2803 char *dest, *src; 2804 char separator = '\0'; 2805 2806 dest = src = path; 2807 if (*src == '\0') { 2808 fsobj_error(a_eno, a_estr, ARCHIVE_ERRNO_MISC, 2809 "Invalid empty ", "pathname"); 2810 return (ARCHIVE_FAILED); 2811 } 2812 2813#if defined(__CYGWIN__) 2814 cleanup_pathname_win(path); 2815#endif 2816 /* Skip leading '/'. */ 2817 if (*src == '/') { 2818 if (flags & ARCHIVE_EXTRACT_SECURE_NOABSOLUTEPATHS) { 2819 fsobj_error(a_eno, a_estr, ARCHIVE_ERRNO_MISC, 2820 "Path is ", "absolute"); 2821 return (ARCHIVE_FAILED); 2822 } 2823 2824 separator = *src++; 2825 } 2826 2827 /* Scan the pathname one element at a time. */ 2828 for (;;) { 2829 /* src points to first char after '/' */ 2830 if (src[0] == '\0') { 2831 break; 2832 } else if (src[0] == '/') { 2833 /* Found '//', ignore second one. */ 2834 src++; 2835 continue; 2836 } else if (src[0] == '.') { 2837 if (src[1] == '\0') { 2838 /* Ignore trailing '.' */ 2839 break; 2840 } else if (src[1] == '/') { 2841 /* Skip './'. */ 2842 src += 2; 2843 continue; 2844 } else if (src[1] == '.') { 2845 if (src[2] == '/' || src[2] == '\0') { 2846 /* Conditionally warn about '..' */ 2847 if (flags 2848 & ARCHIVE_EXTRACT_SECURE_NODOTDOT) { 2849 fsobj_error(a_eno, a_estr, 2850 ARCHIVE_ERRNO_MISC, 2851 "Path contains ", "'..'"); 2852 return (ARCHIVE_FAILED); 2853 } 2854 } 2855 /* 2856 * Note: Under no circumstances do we 2857 * remove '..' elements. In 2858 * particular, restoring 2859 * '/foo/../bar/' should create the 2860 * 'foo' dir as a side-effect. 2861 */ 2862 } 2863 } 2864 2865 /* Copy current element, including leading '/'. */ 2866 if (separator) 2867 *dest++ = '/'; 2868 while (*src != '\0' && *src != '/') { 2869 *dest++ = *src++; 2870 } 2871 2872 if (*src == '\0') 2873 break; 2874 2875 /* Skip '/' separator. */ 2876 separator = *src++; 2877 } 2878 /* 2879 * We've just copied zero or more path elements, not including the 2880 * final '/'. 2881 */ 2882 if (dest == path) { 2883 /* 2884 * Nothing got copied. The path must have been something 2885 * like '.' or '/' or './' or '/././././/./'. 2886 */ 2887 if (separator) 2888 *dest++ = '/'; 2889 else 2890 *dest++ = '.'; 2891 } 2892 /* Terminate the result. */ 2893 *dest = '\0'; 2894 return (ARCHIVE_OK); 2895} 2896 2897static int 2898cleanup_pathname(struct archive_write_disk *a) 2899{ 2900 struct archive_string error_string; 2901 int error_number; 2902 int rc; 2903 archive_string_init(&error_string); 2904 rc = cleanup_pathname_fsobj(a->name, &error_number, &error_string, 2905 a->flags); 2906 if (rc != ARCHIVE_OK) { 2907 archive_set_error(&a->archive, error_number, "%s", 2908 error_string.s); 2909 } 2910 archive_string_free(&error_string); 2911 return rc; 2912} 2913 2914/* 2915 * Create the parent directory of the specified path, assuming path 2916 * is already in mutable storage. 2917 */ 2918static int 2919create_parent_dir(struct archive_write_disk *a, char *path) 2920{ 2921 char *slash; 2922 int r; 2923 2924 /* Remove tail element to obtain parent name. */ 2925 slash = strrchr(path, '/'); 2926 if (slash == NULL) 2927 return (ARCHIVE_OK); 2928 *slash = '\0'; 2929 r = create_dir(a, path); 2930 *slash = '/'; 2931 return (r); 2932} 2933 2934/* 2935 * Create the specified dir, recursing to create parents as necessary. 2936 * 2937 * Returns ARCHIVE_OK if the path exists when we're done here. 2938 * Otherwise, returns ARCHIVE_FAILED. 2939 * Assumes path is in mutable storage; path is unchanged on exit. 2940 */ 2941static int 2942create_dir(struct archive_write_disk *a, char *path) 2943{ 2944 struct stat st; 2945 struct fixup_entry *le; 2946 char *slash, *base; 2947 mode_t mode_final, mode; 2948 int r; 2949 2950 /* Check for special names and just skip them. */ 2951 slash = strrchr(path, '/'); 2952 if (slash == NULL) 2953 base = path; 2954 else 2955 base = slash + 1; 2956 2957 if (base[0] == '\0' || 2958 (base[0] == '.' && base[1] == '\0') || 2959 (base[0] == '.' && base[1] == '.' && base[2] == '\0')) { 2960 /* Don't bother trying to create null path, '.', or '..'. */ 2961 if (slash != NULL) { 2962 *slash = '\0'; 2963 r = create_dir(a, path); 2964 *slash = '/'; 2965 return (r); 2966 } 2967 return (ARCHIVE_OK); 2968 } 2969 2970 /* 2971 * Yes, this should be stat() and not lstat(). Using lstat() 2972 * here loses the ability to extract through symlinks. Also note 2973 * that this should not use the a->st cache. 2974 */ 2975 if (stat(path, &st) == 0) { 2976 if (S_ISDIR(st.st_mode)) 2977 return (ARCHIVE_OK); 2978 if ((a->flags & ARCHIVE_EXTRACT_NO_OVERWRITE)) { 2979 archive_set_error(&a->archive, EEXIST, 2980 "Can't create directory '%s'", path); 2981 return (ARCHIVE_FAILED); 2982 } 2983 if (unlink(path) != 0) { 2984 archive_set_error(&a->archive, errno, 2985 "Can't create directory '%s': " 2986 "Conflicting file cannot be removed", 2987 path); 2988 return (ARCHIVE_FAILED); 2989 } 2990 } else if (errno != ENOENT && errno != ENOTDIR) { 2991 /* Stat failed? */ 2992 archive_set_error(&a->archive, errno, 2993 "Can't test directory '%s'", path); 2994 return (ARCHIVE_FAILED); 2995 } else if (slash != NULL) { 2996 *slash = '\0'; 2997 r = create_dir(a, path); 2998 *slash = '/'; 2999 if (r != ARCHIVE_OK) 3000 return (r); 3001 } 3002 3003 /* 3004 * Mode we want for the final restored directory. Per POSIX, 3005 * implicitly-created dirs must be created obeying the umask. 3006 * There's no mention whether this is different for privileged 3007 * restores (which the rest of this code handles by pretending 3008 * umask=0). I've chosen here to always obey the user's umask for 3009 * implicit dirs, even if _EXTRACT_PERM was specified. 3010 */ 3011 mode_final = DEFAULT_DIR_MODE & ~a->user_umask; 3012 /* Mode we want on disk during the restore process. */ 3013 mode = mode_final; 3014 mode |= MINIMUM_DIR_MODE; 3015 mode &= MAXIMUM_DIR_MODE; 3016 if (mkdir(path, mode) == 0) { 3017 if (mode != mode_final) { 3018 le = new_fixup(a, path); 3019 if (le == NULL) 3020 return (ARCHIVE_FATAL); 3021 le->fixup |=TODO_MODE_BASE; 3022 le->mode = mode_final; 3023 } 3024 return (ARCHIVE_OK); 3025 } 3026 3027 /* 3028 * Without the following check, a/b/../b/c/d fails at the 3029 * second visit to 'b', so 'd' can't be created. Note that we 3030 * don't add it to the fixup list here, as it's already been 3031 * added. 3032 */ 3033 if (stat(path, &st) == 0 && S_ISDIR(st.st_mode)) 3034 return (ARCHIVE_OK); 3035 3036 archive_set_error(&a->archive, errno, "Failed to create dir '%s'", 3037 path); 3038 return (ARCHIVE_FAILED); 3039} 3040 3041/* 3042 * Note: Although we can skip setting the user id if the desired user 3043 * id matches the current user, we cannot skip setting the group, as 3044 * many systems set the gid based on the containing directory. So 3045 * we have to perform a chown syscall if we want to set the SGID 3046 * bit. (The alternative is to stat() and then possibly chown(); it's 3047 * more efficient to skip the stat() and just always chown().) Note 3048 * that a successful chown() here clears the TODO_SGID_CHECK bit, which 3049 * allows set_mode to skip the stat() check for the GID. 3050 */ 3051static int 3052set_ownership(struct archive_write_disk *a) 3053{ 3054#ifndef __CYGWIN__ 3055/* unfortunately, on win32 there is no 'root' user with uid 0, 3056 so we just have to try the chown and see if it works */ 3057 3058 /* If we know we can't change it, don't bother trying. */ 3059 if (a->user_uid != 0 && a->user_uid != a->uid) { 3060 archive_set_error(&a->archive, errno, 3061 "Can't set UID=%jd", (intmax_t)a->uid); 3062 return (ARCHIVE_WARN); 3063 } 3064#endif 3065 3066#ifdef HAVE_FCHOWN 3067 /* If we have an fd, we can avoid a race. */ 3068 if (a->fd >= 0 && fchown(a->fd, a->uid, a->gid) == 0) { 3069 /* We've set owner and know uid/gid are correct. */ 3070 a->todo &= ~(TODO_OWNER | TODO_SGID_CHECK | TODO_SUID_CHECK); 3071 return (ARCHIVE_OK); 3072 } 3073#endif 3074 3075 /* We prefer lchown() but will use chown() if that's all we have. */ 3076 /* Of course, if we have neither, this will always fail. */ 3077#ifdef HAVE_LCHOWN 3078 if (lchown(a->name, a->uid, a->gid) == 0) { 3079 /* We've set owner and know uid/gid are correct. */ 3080 a->todo &= ~(TODO_OWNER | TODO_SGID_CHECK | TODO_SUID_CHECK); 3081 return (ARCHIVE_OK); 3082 } 3083#elif HAVE_CHOWN 3084 if (!S_ISLNK(a->mode) && chown(a->name, a->uid, a->gid) == 0) { 3085 /* We've set owner and know uid/gid are correct. */ 3086 a->todo &= ~(TODO_OWNER | TODO_SGID_CHECK | TODO_SUID_CHECK); 3087 return (ARCHIVE_OK); 3088 } 3089#endif 3090 3091 archive_set_error(&a->archive, errno, 3092 "Can't set user=%jd/group=%jd for %s", 3093 (intmax_t)a->uid, (intmax_t)a->gid, a->name); 3094 return (ARCHIVE_WARN); 3095} 3096 3097/* 3098 * Note: Returns 0 on success, non-zero on failure. 3099 */ 3100static int 3101set_time(int fd, int mode, const char *name, 3102 time_t atime, long atime_nsec, 3103 time_t mtime, long mtime_nsec) 3104{ 3105 /* Select the best implementation for this platform. */ 3106#if defined(HAVE_UTIMENSAT) && defined(HAVE_FUTIMENS) 3107 /* 3108 * utimensat() and futimens() are defined in 3109 * POSIX.1-2008. They support ns resolution and setting times 3110 * on fds and symlinks. 3111 */ 3112 struct timespec ts[2]; 3113 (void)mode; /* UNUSED */ 3114 ts[0].tv_sec = atime; 3115 ts[0].tv_nsec = atime_nsec; 3116 ts[1].tv_sec = mtime; 3117 ts[1].tv_nsec = mtime_nsec; 3118 if (fd >= 0) 3119 return futimens(fd, ts); 3120 return utimensat(AT_FDCWD, name, ts, AT_SYMLINK_NOFOLLOW); 3121 3122#elif HAVE_UTIMES 3123 /* 3124 * The utimes()-family functions support ��s-resolution and 3125 * setting times fds and symlinks. utimes() is documented as 3126 * LEGACY by POSIX, futimes() and lutimes() are not described 3127 * in POSIX. 3128 */ 3129 struct timeval times[2]; 3130 3131 times[0].tv_sec = atime; 3132 times[0].tv_usec = atime_nsec / 1000; 3133 times[1].tv_sec = mtime; 3134 times[1].tv_usec = mtime_nsec / 1000; 3135 3136#ifdef HAVE_FUTIMES 3137 if (fd >= 0) 3138 return (futimes(fd, times)); 3139#else 3140 (void)fd; /* UNUSED */ 3141#endif 3142#ifdef HAVE_LUTIMES 3143 (void)mode; /* UNUSED */ 3144 return (lutimes(name, times)); 3145#else 3146 if (S_ISLNK(mode)) 3147 return (0); 3148 return (utimes(name, times)); 3149#endif 3150 3151#elif defined(HAVE_UTIME) 3152 /* 3153 * utime() is POSIX-standard but only supports 1s resolution and 3154 * does not support fds or symlinks. 3155 */ 3156 struct utimbuf times; 3157 (void)fd; /* UNUSED */ 3158 (void)name; /* UNUSED */ 3159 (void)atime_nsec; /* UNUSED */ 3160 (void)mtime_nsec; /* UNUSED */ 3161 times.actime = atime; 3162 times.modtime = mtime; 3163 if (S_ISLNK(mode)) 3164 return (ARCHIVE_OK); 3165 return (utime(name, ×)); 3166 3167#else 3168 /* 3169 * We don't know how to set the time on this platform. 3170 */ 3171 (void)fd; /* UNUSED */ 3172 (void)mode; /* UNUSED */ 3173 (void)name; /* UNUSED */ 3174 (void)atime_nsec; /* UNUSED */ 3175 (void)mtime_nsec; /* UNUSED */ 3176 return (ARCHIVE_WARN); 3177#endif 3178} 3179 3180#ifdef F_SETTIMES 3181static int 3182set_time_tru64(int fd, int mode, const char *name, 3183 time_t atime, long atime_nsec, 3184 time_t mtime, long mtime_nsec, 3185 time_t ctime, long ctime_nsec) 3186{ 3187 struct attr_timbuf tstamp; 3188 tstamp.atime.tv_sec = atime; 3189 tstamp.mtime.tv_sec = mtime; 3190 tstamp.ctime.tv_sec = ctime; 3191#if defined (__hpux) && defined (__ia64) 3192 tstamp.atime.tv_nsec = atime_nsec; 3193 tstamp.mtime.tv_nsec = mtime_nsec; 3194 tstamp.ctime.tv_nsec = ctime_nsec; 3195#else 3196 tstamp.atime.tv_usec = atime_nsec / 1000; 3197 tstamp.mtime.tv_usec = mtime_nsec / 1000; 3198 tstamp.ctime.tv_usec = ctime_nsec / 1000; 3199#endif 3200 return (fcntl(fd,F_SETTIMES,&tstamp)); 3201} 3202#endif /* F_SETTIMES */ 3203 3204static int 3205set_times(struct archive_write_disk *a, 3206 int fd, int mode, const char *name, 3207 time_t atime, long atime_nanos, 3208 time_t birthtime, long birthtime_nanos, 3209 time_t mtime, long mtime_nanos, 3210 time_t cctime, long ctime_nanos) 3211{ 3212 /* Note: set_time doesn't use libarchive return conventions! 3213 * It uses syscall conventions. So 0 here instead of ARCHIVE_OK. */ 3214 int r1 = 0, r2 = 0; 3215 3216#ifdef F_SETTIMES 3217 /* 3218 * on Tru64 try own fcntl first which can restore even the 3219 * ctime, fall back to default code path below if it fails 3220 * or if we are not running as root 3221 */ 3222 if (a->user_uid == 0 && 3223 set_time_tru64(fd, mode, name, 3224 atime, atime_nanos, mtime, 3225 mtime_nanos, cctime, ctime_nanos) == 0) { 3226 return (ARCHIVE_OK); 3227 } 3228#else /* Tru64 */ 3229 (void)cctime; /* UNUSED */ 3230 (void)ctime_nanos; /* UNUSED */ 3231#endif /* Tru64 */ 3232 3233#ifdef HAVE_STRUCT_STAT_ST_BIRTHTIME 3234 /* 3235 * If you have struct stat.st_birthtime, we assume BSD 3236 * birthtime semantics, in which {f,l,}utimes() updates 3237 * birthtime to earliest mtime. So we set the time twice, 3238 * first using the birthtime, then using the mtime. If 3239 * birthtime == mtime, this isn't necessary, so we skip it. 3240 * If birthtime > mtime, then this won't work, so we skip it. 3241 */ 3242 if (birthtime < mtime 3243 || (birthtime == mtime && birthtime_nanos < mtime_nanos)) 3244 r1 = set_time(fd, mode, name, 3245 atime, atime_nanos, 3246 birthtime, birthtime_nanos); 3247#else 3248 (void)birthtime; /* UNUSED */ 3249 (void)birthtime_nanos; /* UNUSED */ 3250#endif 3251 r2 = set_time(fd, mode, name, 3252 atime, atime_nanos, 3253 mtime, mtime_nanos); 3254 if (r1 != 0 || r2 != 0) { 3255 archive_set_error(&a->archive, errno, 3256 "Can't restore time"); 3257 return (ARCHIVE_WARN); 3258 } 3259 return (ARCHIVE_OK); 3260} 3261 3262static int 3263set_times_from_entry(struct archive_write_disk *a) 3264{ 3265 time_t atime, birthtime, mtime, cctime; 3266 long atime_nsec, birthtime_nsec, mtime_nsec, ctime_nsec; 3267 3268 /* Suitable defaults. */ 3269 atime = birthtime = mtime = cctime = a->start_time; 3270 atime_nsec = birthtime_nsec = mtime_nsec = ctime_nsec = 0; 3271 3272 /* If no time was provided, we're done. */ 3273 if (!archive_entry_atime_is_set(a->entry) 3274#if HAVE_STRUCT_STAT_ST_BIRTHTIME 3275 && !archive_entry_birthtime_is_set(a->entry) 3276#endif 3277 && !archive_entry_mtime_is_set(a->entry)) 3278 return (ARCHIVE_OK); 3279 3280 if (archive_entry_atime_is_set(a->entry)) { 3281 atime = archive_entry_atime(a->entry); 3282 atime_nsec = archive_entry_atime_nsec(a->entry); 3283 } 3284 if (archive_entry_birthtime_is_set(a->entry)) { 3285 birthtime = archive_entry_birthtime(a->entry); 3286 birthtime_nsec = archive_entry_birthtime_nsec(a->entry); 3287 } 3288 if (archive_entry_mtime_is_set(a->entry)) { 3289 mtime = archive_entry_mtime(a->entry); 3290 mtime_nsec = archive_entry_mtime_nsec(a->entry); 3291 } 3292 if (archive_entry_ctime_is_set(a->entry)) { 3293 cctime = archive_entry_ctime(a->entry); 3294 ctime_nsec = archive_entry_ctime_nsec(a->entry); 3295 } 3296 3297 return set_times(a, a->fd, a->mode, a->name, 3298 atime, atime_nsec, 3299 birthtime, birthtime_nsec, 3300 mtime, mtime_nsec, 3301 cctime, ctime_nsec); 3302} 3303 3304static int 3305set_mode(struct archive_write_disk *a, int mode) 3306{ 3307 int r = ARCHIVE_OK; 3308 mode &= 07777; /* Strip off file type bits. */ 3309 3310 if (a->todo & TODO_SGID_CHECK) { 3311 /* 3312 * If we don't know the GID is right, we must stat() 3313 * to verify it. We can't just check the GID of this 3314 * process, since systems sometimes set GID from 3315 * the enclosing dir or based on ACLs. 3316 */ 3317 if ((r = lazy_stat(a)) != ARCHIVE_OK) 3318 return (r); 3319 if (a->pst->st_gid != a->gid) { 3320 mode &= ~ S_ISGID; 3321 if (a->flags & ARCHIVE_EXTRACT_OWNER) { 3322 /* 3323 * This is only an error if you 3324 * requested owner restore. If you 3325 * didn't, we'll try to restore 3326 * sgid/suid, but won't consider it a 3327 * problem if we can't. 3328 */ 3329 archive_set_error(&a->archive, -1, 3330 "Can't restore SGID bit"); 3331 r = ARCHIVE_WARN; 3332 } 3333 } 3334 /* While we're here, double-check the UID. */ 3335 if (a->pst->st_uid != a->uid 3336 && (a->todo & TODO_SUID)) { 3337 mode &= ~ S_ISUID; 3338 if (a->flags & ARCHIVE_EXTRACT_OWNER) { 3339 archive_set_error(&a->archive, -1, 3340 "Can't restore SUID bit"); 3341 r = ARCHIVE_WARN; 3342 } 3343 } 3344 a->todo &= ~TODO_SGID_CHECK; 3345 a->todo &= ~TODO_SUID_CHECK; 3346 } else if (a->todo & TODO_SUID_CHECK) { 3347 /* 3348 * If we don't know the UID is right, we can just check 3349 * the user, since all systems set the file UID from 3350 * the process UID. 3351 */ 3352 if (a->user_uid != a->uid) { 3353 mode &= ~ S_ISUID; 3354 if (a->flags & ARCHIVE_EXTRACT_OWNER) { 3355 archive_set_error(&a->archive, -1, 3356 "Can't make file SUID"); 3357 r = ARCHIVE_WARN; 3358 } 3359 } 3360 a->todo &= ~TODO_SUID_CHECK; 3361 } 3362 3363 if (S_ISLNK(a->mode)) { 3364#ifdef HAVE_LCHMOD 3365 /* 3366 * If this is a symlink, use lchmod(). If the 3367 * platform doesn't support lchmod(), just skip it. A 3368 * platform that doesn't provide a way to set 3369 * permissions on symlinks probably ignores 3370 * permissions on symlinks, so a failure here has no 3371 * impact. 3372 */ 3373 if (lchmod(a->name, mode) != 0) { 3374 switch (errno) { 3375 case ENOTSUP: 3376 case ENOSYS: 3377#if ENOTSUP != EOPNOTSUPP 3378 case EOPNOTSUPP: 3379#endif 3380 /* 3381 * if lchmod is defined but the platform 3382 * doesn't support it, silently ignore 3383 * error 3384 */ 3385 break; 3386 default: 3387 archive_set_error(&a->archive, errno, 3388 "Can't set permissions to 0%o", (int)mode); 3389 r = ARCHIVE_WARN; 3390 } 3391 } 3392#endif 3393 } else if (!S_ISDIR(a->mode)) { 3394 /* 3395 * If it's not a symlink and not a dir, then use 3396 * fchmod() or chmod(), depending on whether we have 3397 * an fd. Dirs get their perms set during the 3398 * post-extract fixup, which is handled elsewhere. 3399 */ 3400#ifdef HAVE_FCHMOD 3401 if (a->fd >= 0) { 3402 if (fchmod(a->fd, mode) != 0) { 3403 archive_set_error(&a->archive, errno, 3404 "Can't set permissions to 0%o", (int)mode); 3405 r = ARCHIVE_WARN; 3406 } 3407 } else 3408#endif 3409 /* If this platform lacks fchmod(), then 3410 * we'll just use chmod(). */ 3411 if (chmod(a->name, mode) != 0) { 3412 archive_set_error(&a->archive, errno, 3413 "Can't set permissions to 0%o", (int)mode); 3414 r = ARCHIVE_WARN; 3415 } 3416 } 3417 return (r); 3418} 3419 3420static int 3421set_fflags(struct archive_write_disk *a) 3422{ 3423 struct fixup_entry *le; 3424 unsigned long set, clear; 3425 int r; 3426 int critical_flags; 3427 mode_t mode = archive_entry_mode(a->entry); 3428 3429 /* 3430 * Make 'critical_flags' hold all file flags that can't be 3431 * immediately restored. For example, on BSD systems, 3432 * SF_IMMUTABLE prevents hardlinks from being created, so 3433 * should not be set until after any hardlinks are created. To 3434 * preserve some semblance of portability, this uses #ifdef 3435 * extensively. Ugly, but it works. 3436 * 3437 * Yes, Virginia, this does create a security race. It's mitigated 3438 * somewhat by the practice of creating dirs 0700 until the extract 3439 * is done, but it would be nice if we could do more than that. 3440 * People restoring critical file systems should be wary of 3441 * other programs that might try to muck with files as they're 3442 * being restored. 3443 */ 3444 /* Hopefully, the compiler will optimize this mess into a constant. */ 3445 critical_flags = 0; 3446#ifdef SF_IMMUTABLE 3447 critical_flags |= SF_IMMUTABLE; 3448#endif 3449#ifdef UF_IMMUTABLE 3450 critical_flags |= UF_IMMUTABLE; 3451#endif 3452#ifdef SF_APPEND 3453 critical_flags |= SF_APPEND; 3454#endif 3455#ifdef UF_APPEND 3456 critical_flags |= UF_APPEND; 3457#endif 3458#ifdef EXT2_APPEND_FL 3459 critical_flags |= EXT2_APPEND_FL; 3460#endif 3461#ifdef EXT2_IMMUTABLE_FL 3462 critical_flags |= EXT2_IMMUTABLE_FL; 3463#endif 3464 3465 if (a->todo & TODO_FFLAGS) { 3466 archive_entry_fflags(a->entry, &set, &clear); 3467 3468 /* 3469 * The first test encourages the compiler to eliminate 3470 * all of this if it's not necessary. 3471 */ 3472 if ((critical_flags != 0) && (set & critical_flags)) { 3473 le = current_fixup(a, a->name); 3474 if (le == NULL) 3475 return (ARCHIVE_FATAL); 3476 le->fixup |= TODO_FFLAGS; 3477 le->fflags_set = set; 3478 /* Store the mode if it's not already there. */ 3479 if ((le->fixup & TODO_MODE) == 0) 3480 le->mode = mode; 3481 } else { 3482 r = set_fflags_platform(a, a->fd, 3483 a->name, mode, set, clear); 3484 if (r != ARCHIVE_OK) 3485 return (r); 3486 } 3487 } 3488 return (ARCHIVE_OK); 3489} 3490 3491static int 3492clear_nochange_fflags(struct archive_write_disk *a) 3493{ 3494 int nochange_flags; 3495 mode_t mode = archive_entry_mode(a->entry); 3496 3497 /* Hopefully, the compiler will optimize this mess into a constant. */ 3498 nochange_flags = 0; 3499#ifdef SF_IMMUTABLE 3500 nochange_flags |= SF_IMMUTABLE; 3501#endif 3502#ifdef UF_IMMUTABLE 3503 nochange_flags |= UF_IMMUTABLE; 3504#endif 3505#ifdef SF_APPEND 3506 nochange_flags |= SF_APPEND; 3507#endif 3508#ifdef UF_APPEND 3509 nochange_flags |= UF_APPEND; 3510#endif 3511#ifdef EXT2_APPEND_FL 3512 nochange_flags |= EXT2_APPEND_FL; 3513#endif 3514#ifdef EXT2_IMMUTABLE_FL 3515 nochange_flags |= EXT2_IMMUTABLE_FL; 3516#endif 3517 3518 return (set_fflags_platform(a, a->fd, a->name, mode, 0, 3519 nochange_flags)); 3520} 3521 3522 3523#if ( defined(HAVE_LCHFLAGS) || defined(HAVE_CHFLAGS) || defined(HAVE_FCHFLAGS) ) && defined(HAVE_STRUCT_STAT_ST_FLAGS) 3524/* 3525 * BSD reads flags using stat() and sets them with one of {f,l,}chflags() 3526 */ 3527static int 3528set_fflags_platform(struct archive_write_disk *a, int fd, const char *name, 3529 mode_t mode, unsigned long set, unsigned long clear) 3530{ 3531 int r; 3532 3533 (void)mode; /* UNUSED */ 3534 if (set == 0 && clear == 0) 3535 return (ARCHIVE_OK); 3536 3537 /* 3538 * XXX Is the stat here really necessary? Or can I just use 3539 * the 'set' flags directly? In particular, I'm not sure 3540 * about the correct approach if we're overwriting an existing 3541 * file that already has flags on it. XXX 3542 */ 3543 if ((r = lazy_stat(a)) != ARCHIVE_OK) 3544 return (r); 3545 3546 a->st.st_flags &= ~clear; 3547 a->st.st_flags |= set; 3548#ifdef HAVE_FCHFLAGS 3549 /* If platform has fchflags() and we were given an fd, use it. */ 3550 if (fd >= 0 && fchflags(fd, a->st.st_flags) == 0) 3551 return (ARCHIVE_OK); 3552#endif 3553 /* 3554 * If we can't use the fd to set the flags, we'll use the 3555 * pathname to set flags. We prefer lchflags() but will use 3556 * chflags() if we must. 3557 */ 3558#ifdef HAVE_LCHFLAGS 3559 if (lchflags(name, a->st.st_flags) == 0) 3560 return (ARCHIVE_OK); 3561#elif defined(HAVE_CHFLAGS) 3562 if (S_ISLNK(a->st.st_mode)) { 3563 archive_set_error(&a->archive, errno, 3564 "Can't set file flags on symlink."); 3565 return (ARCHIVE_WARN); 3566 } 3567 if (chflags(name, a->st.st_flags) == 0) 3568 return (ARCHIVE_OK); 3569#endif 3570 archive_set_error(&a->archive, errno, 3571 "Failed to set file flags"); 3572 return (ARCHIVE_WARN); 3573} 3574 3575#elif defined(EXT2_IOC_GETFLAGS) && defined(EXT2_IOC_SETFLAGS) && defined(HAVE_WORKING_EXT2_IOC_GETFLAGS) 3576/* 3577 * Linux uses ioctl() to read and write file flags. 3578 */ 3579static int 3580set_fflags_platform(struct archive_write_disk *a, int fd, const char *name, 3581 mode_t mode, unsigned long set, unsigned long clear) 3582{ 3583 int ret; 3584 int myfd = fd; 3585 int newflags, oldflags; 3586 int sf_mask = 0; 3587 3588 if (set == 0 && clear == 0) 3589 return (ARCHIVE_OK); 3590 /* Only regular files and dirs can have flags. */ 3591 if (!S_ISREG(mode) && !S_ISDIR(mode)) 3592 return (ARCHIVE_OK); 3593 3594 /* If we weren't given an fd, open it ourselves. */ 3595 if (myfd < 0) { 3596 myfd = open(name, O_RDONLY | O_NONBLOCK | O_BINARY | O_CLOEXEC); 3597 __archive_ensure_cloexec_flag(myfd); 3598 } 3599 if (myfd < 0) 3600 return (ARCHIVE_OK); 3601 3602 /* 3603 * Linux has no define for the flags that are only settable by 3604 * the root user. This code may seem a little complex, but 3605 * there seem to be some Linux systems that lack these 3606 * defines. (?) The code below degrades reasonably gracefully 3607 * if sf_mask is incomplete. 3608 */ 3609#ifdef EXT2_IMMUTABLE_FL 3610 sf_mask |= EXT2_IMMUTABLE_FL; 3611#endif 3612#ifdef EXT2_APPEND_FL 3613 sf_mask |= EXT2_APPEND_FL; 3614#endif 3615 /* 3616 * XXX As above, this would be way simpler if we didn't have 3617 * to read the current flags from disk. XXX 3618 */ 3619 ret = ARCHIVE_OK; 3620 3621 /* Read the current file flags. */ 3622 if (ioctl(myfd, EXT2_IOC_GETFLAGS, &oldflags) < 0) 3623 goto fail; 3624 3625 /* Try setting the flags as given. */ 3626 newflags = (oldflags & ~clear) | set; 3627 if (ioctl(myfd, EXT2_IOC_SETFLAGS, &newflags) >= 0) 3628 goto cleanup; 3629 if (errno != EPERM) 3630 goto fail; 3631 3632 /* If we couldn't set all the flags, try again with a subset. */ 3633 newflags &= ~sf_mask; 3634 oldflags &= sf_mask; 3635 newflags |= oldflags; 3636 if (ioctl(myfd, EXT2_IOC_SETFLAGS, &newflags) >= 0) 3637 goto cleanup; 3638 3639 /* We couldn't set the flags, so report the failure. */ 3640fail: 3641 archive_set_error(&a->archive, errno, 3642 "Failed to set file flags"); 3643 ret = ARCHIVE_WARN; 3644cleanup: 3645 if (fd < 0) 3646 close(myfd); 3647 return (ret); 3648} 3649 3650#else 3651 3652/* 3653 * Of course, some systems have neither BSD chflags() nor Linux' flags 3654 * support through ioctl(). 3655 */ 3656static int 3657set_fflags_platform(struct archive_write_disk *a, int fd, const char *name, 3658 mode_t mode, unsigned long set, unsigned long clear) 3659{ 3660 (void)a; /* UNUSED */ 3661 (void)fd; /* UNUSED */ 3662 (void)name; /* UNUSED */ 3663 (void)mode; /* UNUSED */ 3664 (void)set; /* UNUSED */ 3665 (void)clear; /* UNUSED */ 3666 return (ARCHIVE_OK); 3667} 3668 3669#endif /* __linux */ 3670 3671#ifndef HAVE_COPYFILE_H 3672/* Default is to simply drop Mac extended metadata. */ 3673static int 3674set_mac_metadata(struct archive_write_disk *a, const char *pathname, 3675 const void *metadata, size_t metadata_size) 3676{ 3677 (void)a; /* UNUSED */ 3678 (void)pathname; /* UNUSED */ 3679 (void)metadata; /* UNUSED */ 3680 (void)metadata_size; /* UNUSED */ 3681 return (ARCHIVE_OK); 3682} 3683 3684static int 3685fixup_appledouble(struct archive_write_disk *a, const char *pathname) 3686{ 3687 (void)a; /* UNUSED */ 3688 (void)pathname; /* UNUSED */ 3689 return (ARCHIVE_OK); 3690} 3691#else 3692 3693/* 3694 * On Mac OS, we use copyfile() to unpack the metadata and 3695 * apply it to the target file. 3696 */ 3697 3698#if defined(HAVE_SYS_XATTR_H) 3699static int 3700copy_xattrs(struct archive_write_disk *a, int tmpfd, int dffd) 3701{ 3702 ssize_t xattr_size; 3703 char *xattr_names = NULL, *xattr_val = NULL; 3704 int ret = ARCHIVE_OK, xattr_i; 3705 3706 xattr_size = flistxattr(tmpfd, NULL, 0, 0); 3707 if (xattr_size == -1) { 3708 archive_set_error(&a->archive, errno, 3709 "Failed to read metadata(xattr)"); 3710 ret = ARCHIVE_WARN; 3711 goto exit_xattr; 3712 } 3713 xattr_names = malloc(xattr_size); 3714 if (xattr_names == NULL) { 3715 archive_set_error(&a->archive, ENOMEM, 3716 "Can't allocate memory for metadata(xattr)"); 3717 ret = ARCHIVE_FATAL; 3718 goto exit_xattr; 3719 } 3720 xattr_size = flistxattr(tmpfd, xattr_names, xattr_size, 0); 3721 if (xattr_size == -1) { 3722 archive_set_error(&a->archive, errno, 3723 "Failed to read metadata(xattr)"); 3724 ret = ARCHIVE_WARN; 3725 goto exit_xattr; 3726 } 3727 for (xattr_i = 0; xattr_i < xattr_size; 3728 xattr_i += strlen(xattr_names + xattr_i) + 1) { 3729 char *xattr_val_saved; 3730 ssize_t s; 3731 int f; 3732 3733 s = fgetxattr(tmpfd, xattr_names + xattr_i, NULL, 0, 0, 0); 3734 if (s == -1) { 3735 archive_set_error(&a->archive, errno, 3736 "Failed to get metadata(xattr)"); 3737 ret = ARCHIVE_WARN; 3738 goto exit_xattr; 3739 } 3740 xattr_val_saved = xattr_val; 3741 xattr_val = realloc(xattr_val, s); 3742 if (xattr_val == NULL) { 3743 archive_set_error(&a->archive, ENOMEM, 3744 "Failed to get metadata(xattr)"); 3745 ret = ARCHIVE_WARN; 3746 free(xattr_val_saved); 3747 goto exit_xattr; 3748 } 3749 s = fgetxattr(tmpfd, xattr_names + xattr_i, xattr_val, s, 0, 0); 3750 if (s == -1) { 3751 archive_set_error(&a->archive, errno, 3752 "Failed to get metadata(xattr)"); 3753 ret = ARCHIVE_WARN; 3754 goto exit_xattr; 3755 } 3756 f = fsetxattr(dffd, xattr_names + xattr_i, xattr_val, s, 0, 0); 3757 if (f == -1) { 3758 archive_set_error(&a->archive, errno, 3759 "Failed to get metadata(xattr)"); 3760 ret = ARCHIVE_WARN; 3761 goto exit_xattr; 3762 } 3763 } 3764exit_xattr: 3765 free(xattr_names); 3766 free(xattr_val); 3767 return (ret); 3768} 3769#endif 3770 3771static int 3772copy_acls(struct archive_write_disk *a, int tmpfd, int dffd) 3773{ 3774#ifndef HAVE_SYS_ACL_H 3775 return 0; 3776#else 3777 acl_t acl, dfacl = NULL; 3778 int acl_r, ret = ARCHIVE_OK; 3779 3780 acl = acl_get_fd(tmpfd); 3781 if (acl == NULL) { 3782 if (errno == ENOENT) 3783 /* There are not any ACLs. */ 3784 return (ret); 3785 archive_set_error(&a->archive, errno, 3786 "Failed to get metadata(acl)"); 3787 ret = ARCHIVE_WARN; 3788 goto exit_acl; 3789 } 3790 dfacl = acl_dup(acl); 3791 acl_r = acl_set_fd(dffd, dfacl); 3792 if (acl_r == -1) { 3793 archive_set_error(&a->archive, errno, 3794 "Failed to get metadata(acl)"); 3795 ret = ARCHIVE_WARN; 3796 goto exit_acl; 3797 } 3798exit_acl: 3799 if (acl) 3800 acl_free(acl); 3801 if (dfacl) 3802 acl_free(dfacl); 3803 return (ret); 3804#endif 3805} 3806 3807static int 3808create_tempdatafork(struct archive_write_disk *a, const char *pathname) 3809{ 3810 struct archive_string tmpdatafork; 3811 int tmpfd; 3812 3813 archive_string_init(&tmpdatafork); 3814 archive_strcpy(&tmpdatafork, "tar.md.XXXXXX"); 3815 tmpfd = mkstemp(tmpdatafork.s); 3816 if (tmpfd < 0) { 3817 archive_set_error(&a->archive, errno, 3818 "Failed to mkstemp"); 3819 archive_string_free(&tmpdatafork); 3820 return (-1); 3821 } 3822 if (copyfile(pathname, tmpdatafork.s, 0, 3823 COPYFILE_UNPACK | COPYFILE_NOFOLLOW 3824 | COPYFILE_ACL | COPYFILE_XATTR) < 0) { 3825 archive_set_error(&a->archive, errno, 3826 "Failed to restore metadata"); 3827 close(tmpfd); 3828 tmpfd = -1; 3829 } 3830 unlink(tmpdatafork.s); 3831 archive_string_free(&tmpdatafork); 3832 return (tmpfd); 3833} 3834 3835static int 3836copy_metadata(struct archive_write_disk *a, const char *metadata, 3837 const char *datafork, int datafork_compressed) 3838{ 3839 int ret = ARCHIVE_OK; 3840 3841 if (datafork_compressed) { 3842 int dffd, tmpfd; 3843 3844 tmpfd = create_tempdatafork(a, metadata); 3845 if (tmpfd == -1) 3846 return (ARCHIVE_WARN); 3847 3848 /* 3849 * Do not open the data fork compressed by HFS+ compression 3850 * with at least a writing mode(O_RDWR or O_WRONLY). it 3851 * makes the data fork uncompressed. 3852 */ 3853 dffd = open(datafork, 0); 3854 if (dffd == -1) { 3855 archive_set_error(&a->archive, errno, 3856 "Failed to open the data fork for metadata"); 3857 close(tmpfd); 3858 return (ARCHIVE_WARN); 3859 } 3860 3861#if defined(HAVE_SYS_XATTR_H) 3862 ret = copy_xattrs(a, tmpfd, dffd); 3863 if (ret == ARCHIVE_OK) 3864#endif 3865 ret = copy_acls(a, tmpfd, dffd); 3866 close(tmpfd); 3867 close(dffd); 3868 } else { 3869 if (copyfile(metadata, datafork, 0, 3870 COPYFILE_UNPACK | COPYFILE_NOFOLLOW 3871 | COPYFILE_ACL | COPYFILE_XATTR) < 0) { 3872 archive_set_error(&a->archive, errno, 3873 "Failed to restore metadata"); 3874 ret = ARCHIVE_WARN; 3875 } 3876 } 3877 return (ret); 3878} 3879 3880static int 3881set_mac_metadata(struct archive_write_disk *a, const char *pathname, 3882 const void *metadata, size_t metadata_size) 3883{ 3884 struct archive_string tmp; 3885 ssize_t written; 3886 int fd; 3887 int ret = ARCHIVE_OK; 3888 3889 /* This would be simpler if copyfile() could just accept the 3890 * metadata as a block of memory; then we could sidestep this 3891 * silly dance of writing the data to disk just so that 3892 * copyfile() can read it back in again. */ 3893 archive_string_init(&tmp); 3894 archive_strcpy(&tmp, pathname); 3895 archive_strcat(&tmp, ".XXXXXX"); 3896 fd = mkstemp(tmp.s); 3897 3898 if (fd < 0) { 3899 archive_set_error(&a->archive, errno, 3900 "Failed to restore metadata"); 3901 archive_string_free(&tmp); 3902 return (ARCHIVE_WARN); 3903 } 3904 written = write(fd, metadata, metadata_size); 3905 close(fd); 3906 if ((size_t)written != metadata_size) { 3907 archive_set_error(&a->archive, errno, 3908 "Failed to restore metadata"); 3909 ret = ARCHIVE_WARN; 3910 } else { 3911 int compressed; 3912 3913#if defined(UF_COMPRESSED) 3914 if ((a->todo & TODO_HFS_COMPRESSION) != 0 && 3915 (ret = lazy_stat(a)) == ARCHIVE_OK) 3916 compressed = a->st.st_flags & UF_COMPRESSED; 3917 else 3918#endif 3919 compressed = 0; 3920 ret = copy_metadata(a, tmp.s, pathname, compressed); 3921 } 3922 unlink(tmp.s); 3923 archive_string_free(&tmp); 3924 return (ret); 3925} 3926 3927static int 3928fixup_appledouble(struct archive_write_disk *a, const char *pathname) 3929{ 3930 char buff[8]; 3931 struct stat st; 3932 const char *p; 3933 struct archive_string datafork; 3934 int fd = -1, ret = ARCHIVE_OK; 3935 3936 archive_string_init(&datafork); 3937 /* Check if the current file name is a type of the resource 3938 * fork file. */ 3939 p = strrchr(pathname, '/'); 3940 if (p == NULL) 3941 p = pathname; 3942 else 3943 p++; 3944 if (p[0] != '.' || p[1] != '_') 3945 goto skip_appledouble; 3946 3947 /* 3948 * Check if the data fork file exists. 3949 * 3950 * TODO: Check if this write disk object has handled it. 3951 */ 3952 archive_strncpy(&datafork, pathname, p - pathname); 3953 archive_strcat(&datafork, p + 2); 3954 if (lstat(datafork.s, &st) == -1 || 3955 (st.st_mode & AE_IFMT) != AE_IFREG) 3956 goto skip_appledouble; 3957 3958 /* 3959 * Check if the file is in the AppleDouble form. 3960 */ 3961 fd = open(pathname, O_RDONLY | O_BINARY | O_CLOEXEC); 3962 __archive_ensure_cloexec_flag(fd); 3963 if (fd == -1) { 3964 archive_set_error(&a->archive, errno, 3965 "Failed to open a restoring file"); 3966 ret = ARCHIVE_WARN; 3967 goto skip_appledouble; 3968 } 3969 if (read(fd, buff, 8) == -1) { 3970 archive_set_error(&a->archive, errno, 3971 "Failed to read a restoring file"); 3972 close(fd); 3973 ret = ARCHIVE_WARN; 3974 goto skip_appledouble; 3975 } 3976 close(fd); 3977 /* Check AppleDouble Magic Code. */ 3978 if (archive_be32dec(buff) != 0x00051607) 3979 goto skip_appledouble; 3980 /* Check AppleDouble Version. */ 3981 if (archive_be32dec(buff+4) != 0x00020000) 3982 goto skip_appledouble; 3983 3984 ret = copy_metadata(a, pathname, datafork.s, 3985#if defined(UF_COMPRESSED) 3986 st.st_flags & UF_COMPRESSED); 3987#else 3988 0); 3989#endif 3990 if (ret == ARCHIVE_OK) { 3991 unlink(pathname); 3992 ret = ARCHIVE_EOF; 3993 } 3994skip_appledouble: 3995 archive_string_free(&datafork); 3996 return (ret); 3997} 3998#endif 3999 4000#if HAVE_LSETXATTR || HAVE_LSETEA 4001/* 4002 * Restore extended attributes - Linux and AIX implementations: 4003 * AIX' ea interface is syntaxwise identical to the Linux xattr interface. 4004 */ 4005static int 4006set_xattrs(struct archive_write_disk *a) 4007{ 4008 struct archive_entry *entry = a->entry; 4009 static int warning_done = 0; 4010 int ret = ARCHIVE_OK; 4011 int i = archive_entry_xattr_reset(entry); 4012 4013 while (i--) { 4014 const char *name; 4015 const void *value; 4016 size_t size; 4017 archive_entry_xattr_next(entry, &name, &value, &size); 4018 if (name != NULL && 4019 strncmp(name, "xfsroot.", 8) != 0 && 4020 strncmp(name, "system.", 7) != 0) { 4021 int e; 4022#if HAVE_FSETXATTR 4023 if (a->fd >= 0) 4024 e = fsetxattr(a->fd, name, value, size, 0); 4025 else 4026#elif HAVE_FSETEA 4027 if (a->fd >= 0) 4028 e = fsetea(a->fd, name, value, size, 0); 4029 else 4030#endif 4031 { 4032#if HAVE_LSETXATTR 4033 e = lsetxattr(archive_entry_pathname(entry), 4034 name, value, size, 0); 4035#elif HAVE_LSETEA 4036 e = lsetea(archive_entry_pathname(entry), 4037 name, value, size, 0); 4038#endif 4039 } 4040 if (e == -1) { 4041 if (errno == ENOTSUP || errno == ENOSYS) { 4042 if (!warning_done) { 4043 warning_done = 1; 4044 archive_set_error(&a->archive, 4045 errno, 4046 "Cannot restore extended " 4047 "attributes on this file " 4048 "system"); 4049 } 4050 } else 4051 archive_set_error(&a->archive, errno, 4052 "Failed to set extended attribute"); 4053 ret = ARCHIVE_WARN; 4054 } 4055 } else { 4056 archive_set_error(&a->archive, 4057 ARCHIVE_ERRNO_FILE_FORMAT, 4058 "Invalid extended attribute encountered"); 4059 ret = ARCHIVE_WARN; 4060 } 4061 } 4062 return (ret); 4063} 4064#elif HAVE_EXTATTR_SET_FILE && HAVE_DECL_EXTATTR_NAMESPACE_USER 4065/* 4066 * Restore extended attributes - FreeBSD implementation 4067 */ 4068static int 4069set_xattrs(struct archive_write_disk *a) 4070{ 4071 struct archive_entry *entry = a->entry; 4072 static int warning_done = 0; 4073 int ret = ARCHIVE_OK; 4074 int i = archive_entry_xattr_reset(entry); 4075 4076 while (i--) { 4077 const char *name; 4078 const void *value; 4079 size_t size; 4080 archive_entry_xattr_next(entry, &name, &value, &size); 4081 if (name != NULL) { 4082 ssize_t e; 4083 int namespace; 4084 4085 if (strncmp(name, "user.", 5) == 0) { 4086 /* "user." attributes go to user namespace */ 4087 name += 5; 4088 namespace = EXTATTR_NAMESPACE_USER; 4089 } else { 4090 /* Warn about other extended attributes. */ 4091 archive_set_error(&a->archive, 4092 ARCHIVE_ERRNO_FILE_FORMAT, 4093 "Can't restore extended attribute ``%s''", 4094 name); 4095 ret = ARCHIVE_WARN; 4096 continue; 4097 } 4098 errno = 0; 4099#if HAVE_EXTATTR_SET_FD 4100 if (a->fd >= 0) 4101 e = extattr_set_fd(a->fd, namespace, name, 4102 value, size); 4103 else 4104#endif 4105 /* TODO: should we use extattr_set_link() instead? */ 4106 { 4107 e = extattr_set_file( 4108 archive_entry_pathname(entry), namespace, 4109 name, value, size); 4110 } 4111 if (e != (ssize_t)size) { 4112 if (errno == ENOTSUP || errno == ENOSYS) { 4113 if (!warning_done) { 4114 warning_done = 1; 4115 archive_set_error(&a->archive, 4116 errno, 4117 "Cannot restore extended " 4118 "attributes on this file " 4119 "system"); 4120 } 4121 } else { 4122 archive_set_error(&a->archive, errno, 4123 "Failed to set extended attribute"); 4124 } 4125 4126 ret = ARCHIVE_WARN; 4127 } 4128 } 4129 } 4130 return (ret); 4131} 4132#else 4133/* 4134 * Restore extended attributes - stub implementation for unsupported systems 4135 */ 4136static int 4137set_xattrs(struct archive_write_disk *a) 4138{ 4139 static int warning_done = 0; 4140 4141 /* If there aren't any extended attributes, then it's okay not 4142 * to extract them, otherwise, issue a single warning. */ 4143 if (archive_entry_xattr_count(a->entry) != 0 && !warning_done) { 4144 warning_done = 1; 4145 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 4146 "Cannot restore extended attributes on this system"); 4147 return (ARCHIVE_WARN); 4148 } 4149 /* Warning was already emitted; suppress further warnings. */ 4150 return (ARCHIVE_OK); 4151} 4152#endif 4153 4154/* 4155 * Test if file on disk is older than entry. 4156 */ 4157static int 4158older(struct stat *st, struct archive_entry *entry) 4159{ 4160 /* First, test the seconds and return if we have a definite answer. */ 4161 /* Definitely older. */ 4162 if (to_int64_time(st->st_mtime) < to_int64_time(archive_entry_mtime(entry))) 4163 return (1); 4164 /* Definitely younger. */ 4165 if (to_int64_time(st->st_mtime) > to_int64_time(archive_entry_mtime(entry))) 4166 return (0); 4167 /* If this platform supports fractional seconds, try those. */ 4168#if HAVE_STRUCT_STAT_ST_MTIMESPEC_TV_NSEC 4169 /* Definitely older. */ 4170 if (st->st_mtimespec.tv_nsec < archive_entry_mtime_nsec(entry)) 4171 return (1); 4172#elif HAVE_STRUCT_STAT_ST_MTIM_TV_NSEC 4173 /* Definitely older. */ 4174 if (st->st_mtim.tv_nsec < archive_entry_mtime_nsec(entry)) 4175 return (1); 4176#elif HAVE_STRUCT_STAT_ST_MTIME_N 4177 /* older. */ 4178 if (st->st_mtime_n < archive_entry_mtime_nsec(entry)) 4179 return (1); 4180#elif HAVE_STRUCT_STAT_ST_UMTIME 4181 /* older. */ 4182 if (st->st_umtime * 1000 < archive_entry_mtime_nsec(entry)) 4183 return (1); 4184#elif HAVE_STRUCT_STAT_ST_MTIME_USEC 4185 /* older. */ 4186 if (st->st_mtime_usec * 1000 < archive_entry_mtime_nsec(entry)) 4187 return (1); 4188#else 4189 /* This system doesn't have high-res timestamps. */ 4190#endif 4191 /* Same age or newer, so not older. */ 4192 return (0); 4193} 4194 4195#endif /* !_WIN32 || __CYGWIN__ */ 4196 4197