archive_write_disk_posix.c revision 316338
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 HAVE_SYS_XATTR_H 43#include <sys/xattr.h> 44#elif 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_ACL_DARWIN 579 /* 580 * On MacOS, platform ACLs get stored in mac_metadata, too. 581 * If we intend to extract mac_metadata and it is present 582 * we skip extracting libarchive NFSv4 ACLs. 583 */ 584 size_t metadata_size; 585 586 if ((a->flags & ARCHIVE_EXTRACT_MAC_METADATA) == 0 || 587 archive_entry_mac_metadata(a->entry, 588 &metadata_size) == NULL || metadata_size == 0) 589#endif 590#if ARCHIVE_ACL_LIBRICHACL 591 /* 592 * RichACLs are stored in an extended attribute. 593 * If we intend to extract extended attributes and have this 594 * attribute we skip extracting libarchive NFSv4 ACLs. 595 */ 596 short extract_acls = 1; 597 if (a->flags & ARCHIVE_EXTRACT_XATTR && ( 598 archive_entry_acl_types(a->entry) & 599 ARCHIVE_ENTRY_ACL_TYPE_NFS4)) { 600 const char *attr_name; 601 const void *attr_value; 602 size_t attr_size; 603 int i = archive_entry_xattr_reset(a->entry); 604 while (i--) { 605 archive_entry_xattr_next(a->entry, &attr_name, 606 &attr_value, &attr_size); 607 if (attr_name != NULL && attr_value != NULL && 608 attr_size > 0 && strcmp(attr_name, 609 "trusted.richacl") == 0) { 610 extract_acls = 0; 611 break; 612 } 613 } 614 } 615 if (extract_acls) 616#endif 617#if ARCHIVE_ACL_DARWIN || ARCHIVE_ACL_LIBRICHACL 618 { 619#endif 620 if (archive_entry_filetype(a->entry) == AE_IFDIR) 621 a->deferred |= TODO_ACLS; 622 else 623 a->todo |= TODO_ACLS; 624#if ARCHIVE_ACL_DARWIN || ARCHIVE_ACL_LIBRICHACL 625 } 626#endif 627 } 628 if (a->flags & ARCHIVE_EXTRACT_MAC_METADATA) { 629 if (archive_entry_filetype(a->entry) == AE_IFDIR) 630 a->deferred |= TODO_MAC_METADATA; 631 else 632 a->todo |= TODO_MAC_METADATA; 633 } 634#if defined(__APPLE__) && defined(UF_COMPRESSED) && defined(HAVE_ZLIB_H) 635 if ((a->flags & ARCHIVE_EXTRACT_NO_HFS_COMPRESSION) == 0) { 636 unsigned long set, clear; 637 archive_entry_fflags(a->entry, &set, &clear); 638 if ((set & ~clear) & UF_COMPRESSED) { 639 a->todo |= TODO_HFS_COMPRESSION; 640 a->decmpfs_block_count = (unsigned)-1; 641 } 642 } 643 if ((a->flags & ARCHIVE_EXTRACT_HFS_COMPRESSION_FORCED) != 0 && 644 (a->mode & AE_IFMT) == AE_IFREG && a->filesize > 0) { 645 a->todo |= TODO_HFS_COMPRESSION; 646 a->decmpfs_block_count = (unsigned)-1; 647 } 648 { 649 const char *p; 650 651 /* Check if the current file name is a type of the 652 * resource fork file. */ 653 p = strrchr(a->name, '/'); 654 if (p == NULL) 655 p = a->name; 656 else 657 p++; 658 if (p[0] == '.' && p[1] == '_') { 659 /* Do not compress "._XXX" files. */ 660 a->todo &= ~TODO_HFS_COMPRESSION; 661 if (a->filesize > 0) 662 a->todo |= TODO_APPLEDOUBLE; 663 } 664 } 665#endif 666 667 if (a->flags & ARCHIVE_EXTRACT_XATTR) { 668#if ARCHIVE_XATTR_DARWIN 669 /* 670 * On MacOS, extended attributes get stored in mac_metadata, 671 * too. If we intend to extract mac_metadata and it is present 672 * we skip extracting extended attributes. 673 */ 674 size_t metadata_size; 675 676 if ((a->flags & ARCHIVE_EXTRACT_MAC_METADATA) == 0 || 677 archive_entry_mac_metadata(a->entry, 678 &metadata_size) == NULL || metadata_size == 0) 679#endif 680 a->todo |= TODO_XATTR; 681 } 682 if (a->flags & ARCHIVE_EXTRACT_FFLAGS) 683 a->todo |= TODO_FFLAGS; 684 if (a->flags & ARCHIVE_EXTRACT_SECURE_SYMLINKS) { 685 ret = check_symlinks(a); 686 if (ret != ARCHIVE_OK) 687 return (ret); 688 } 689#if defined(HAVE_FCHDIR) && defined(PATH_MAX) 690 /* If path exceeds PATH_MAX, shorten the path. */ 691 edit_deep_directories(a); 692#endif 693 694 ret = restore_entry(a); 695 696#if defined(__APPLE__) && defined(UF_COMPRESSED) && defined(HAVE_ZLIB_H) 697 /* 698 * Check if the filesystem the file is restoring on supports 699 * HFS+ Compression. If not, cancel HFS+ Compression. 700 */ 701 if (a->todo | TODO_HFS_COMPRESSION) { 702 /* 703 * NOTE: UF_COMPRESSED is ignored even if the filesystem 704 * supports HFS+ Compression because the file should 705 * have at least an extended attribute "com.apple.decmpfs" 706 * before the flag is set to indicate that the file have 707 * been compressed. If the filesystem does not support 708 * HFS+ Compression the system call will fail. 709 */ 710 if (a->fd < 0 || fchflags(a->fd, UF_COMPRESSED) != 0) 711 a->todo &= ~TODO_HFS_COMPRESSION; 712 } 713#endif 714 715 /* 716 * TODO: There are rumours that some extended attributes must 717 * be restored before file data is written. If this is true, 718 * then we either need to write all extended attributes both 719 * before and after restoring the data, or find some rule for 720 * determining which must go first and which last. Due to the 721 * many ways people are using xattrs, this may prove to be an 722 * intractable problem. 723 */ 724 725#ifdef HAVE_FCHDIR 726 /* If we changed directory above, restore it here. */ 727 if (a->restore_pwd >= 0) { 728 r = fchdir(a->restore_pwd); 729 if (r != 0) { 730 archive_set_error(&a->archive, errno, 731 "chdir() failure"); 732 ret = ARCHIVE_FATAL; 733 } 734 close(a->restore_pwd); 735 a->restore_pwd = -1; 736 } 737#endif 738 739 /* 740 * Fixup uses the unedited pathname from archive_entry_pathname(), 741 * because it is relative to the base dir and the edited path 742 * might be relative to some intermediate dir as a result of the 743 * deep restore logic. 744 */ 745 if (a->deferred & TODO_MODE) { 746 fe = current_fixup(a, archive_entry_pathname(entry)); 747 if (fe == NULL) 748 return (ARCHIVE_FATAL); 749 fe->fixup |= TODO_MODE_BASE; 750 fe->mode = a->mode; 751 } 752 753 if ((a->deferred & TODO_TIMES) 754 && (archive_entry_mtime_is_set(entry) 755 || archive_entry_atime_is_set(entry))) { 756 fe = current_fixup(a, archive_entry_pathname(entry)); 757 if (fe == NULL) 758 return (ARCHIVE_FATAL); 759 fe->mode = a->mode; 760 fe->fixup |= TODO_TIMES; 761 if (archive_entry_atime_is_set(entry)) { 762 fe->atime = archive_entry_atime(entry); 763 fe->atime_nanos = archive_entry_atime_nsec(entry); 764 } else { 765 /* If atime is unset, use start time. */ 766 fe->atime = a->start_time; 767 fe->atime_nanos = 0; 768 } 769 if (archive_entry_mtime_is_set(entry)) { 770 fe->mtime = archive_entry_mtime(entry); 771 fe->mtime_nanos = archive_entry_mtime_nsec(entry); 772 } else { 773 /* If mtime is unset, use start time. */ 774 fe->mtime = a->start_time; 775 fe->mtime_nanos = 0; 776 } 777 if (archive_entry_birthtime_is_set(entry)) { 778 fe->birthtime = archive_entry_birthtime(entry); 779 fe->birthtime_nanos = archive_entry_birthtime_nsec( 780 entry); 781 } else { 782 /* If birthtime is unset, use mtime. */ 783 fe->birthtime = fe->mtime; 784 fe->birthtime_nanos = fe->mtime_nanos; 785 } 786 } 787 788 if (a->deferred & TODO_ACLS) { 789 fe = current_fixup(a, archive_entry_pathname(entry)); 790 if (fe == NULL) 791 return (ARCHIVE_FATAL); 792 fe->fixup |= TODO_ACLS; 793 archive_acl_copy(&fe->acl, archive_entry_acl(entry)); 794 } 795 796 if (a->deferred & TODO_MAC_METADATA) { 797 const void *metadata; 798 size_t metadata_size; 799 metadata = archive_entry_mac_metadata(a->entry, &metadata_size); 800 if (metadata != NULL && metadata_size > 0) { 801 fe = current_fixup(a, archive_entry_pathname(entry)); 802 if (fe == NULL) 803 return (ARCHIVE_FATAL); 804 fe->mac_metadata = malloc(metadata_size); 805 if (fe->mac_metadata != NULL) { 806 memcpy(fe->mac_metadata, metadata, 807 metadata_size); 808 fe->mac_metadata_size = metadata_size; 809 fe->fixup |= TODO_MAC_METADATA; 810 } 811 } 812 } 813 814 if (a->deferred & TODO_FFLAGS) { 815 fe = current_fixup(a, archive_entry_pathname(entry)); 816 if (fe == NULL) 817 return (ARCHIVE_FATAL); 818 fe->fixup |= TODO_FFLAGS; 819 /* TODO: Complete this.. defer fflags from below. */ 820 } 821 822 /* We've created the object and are ready to pour data into it. */ 823 if (ret >= ARCHIVE_WARN) 824 a->archive.state = ARCHIVE_STATE_DATA; 825 /* 826 * If it's not open, tell our client not to try writing. 827 * In particular, dirs, links, etc, don't get written to. 828 */ 829 if (a->fd < 0) { 830 archive_entry_set_size(entry, 0); 831 a->filesize = 0; 832 } 833 834 return (ret); 835} 836 837int 838archive_write_disk_set_skip_file(struct archive *_a, int64_t d, int64_t i) 839{ 840 struct archive_write_disk *a = (struct archive_write_disk *)_a; 841 archive_check_magic(&a->archive, ARCHIVE_WRITE_DISK_MAGIC, 842 ARCHIVE_STATE_ANY, "archive_write_disk_set_skip_file"); 843 a->skip_file_set = 1; 844 a->skip_file_dev = d; 845 a->skip_file_ino = i; 846 return (ARCHIVE_OK); 847} 848 849static ssize_t 850write_data_block(struct archive_write_disk *a, const char *buff, size_t size) 851{ 852 uint64_t start_size = size; 853 ssize_t bytes_written = 0; 854 ssize_t block_size = 0, bytes_to_write; 855 856 if (size == 0) 857 return (ARCHIVE_OK); 858 859 if (a->filesize == 0 || a->fd < 0) { 860 archive_set_error(&a->archive, 0, 861 "Attempt to write to an empty file"); 862 return (ARCHIVE_WARN); 863 } 864 865 if (a->flags & ARCHIVE_EXTRACT_SPARSE) { 866#if HAVE_STRUCT_STAT_ST_BLKSIZE 867 int r; 868 if ((r = lazy_stat(a)) != ARCHIVE_OK) 869 return (r); 870 block_size = a->pst->st_blksize; 871#else 872 /* XXX TODO XXX Is there a more appropriate choice here ? */ 873 /* This needn't match the filesystem allocation size. */ 874 block_size = 16*1024; 875#endif 876 } 877 878 /* If this write would run beyond the file size, truncate it. */ 879 if (a->filesize >= 0 && (int64_t)(a->offset + size) > a->filesize) 880 start_size = size = (size_t)(a->filesize - a->offset); 881 882 /* Write the data. */ 883 while (size > 0) { 884 if (block_size == 0) { 885 bytes_to_write = size; 886 } else { 887 /* We're sparsifying the file. */ 888 const char *p, *end; 889 int64_t block_end; 890 891 /* Skip leading zero bytes. */ 892 for (p = buff, end = buff + size; p < end; ++p) { 893 if (*p != '\0') 894 break; 895 } 896 a->offset += p - buff; 897 size -= p - buff; 898 buff = p; 899 if (size == 0) 900 break; 901 902 /* Calculate next block boundary after offset. */ 903 block_end 904 = (a->offset / block_size + 1) * block_size; 905 906 /* If the adjusted write would cross block boundary, 907 * truncate it to the block boundary. */ 908 bytes_to_write = size; 909 if (a->offset + bytes_to_write > block_end) 910 bytes_to_write = block_end - a->offset; 911 } 912 /* Seek if necessary to the specified offset. */ 913 if (a->offset != a->fd_offset) { 914 if (lseek(a->fd, a->offset, SEEK_SET) < 0) { 915 archive_set_error(&a->archive, errno, 916 "Seek failed"); 917 return (ARCHIVE_FATAL); 918 } 919 a->fd_offset = a->offset; 920 } 921 bytes_written = write(a->fd, buff, bytes_to_write); 922 if (bytes_written < 0) { 923 archive_set_error(&a->archive, errno, "Write failed"); 924 return (ARCHIVE_WARN); 925 } 926 buff += bytes_written; 927 size -= bytes_written; 928 a->total_bytes_written += bytes_written; 929 a->offset += bytes_written; 930 a->fd_offset = a->offset; 931 } 932 return (start_size - size); 933} 934 935#if defined(__APPLE__) && defined(UF_COMPRESSED) && defined(HAVE_SYS_XATTR_H)\ 936 && defined(HAVE_ZLIB_H) 937 938/* 939 * Set UF_COMPRESSED file flag. 940 * This have to be called after hfs_write_decmpfs() because if the 941 * file does not have "com.apple.decmpfs" xattr the flag is ignored. 942 */ 943static int 944hfs_set_compressed_fflag(struct archive_write_disk *a) 945{ 946 int r; 947 948 if ((r = lazy_stat(a)) != ARCHIVE_OK) 949 return (r); 950 951 a->st.st_flags |= UF_COMPRESSED; 952 if (fchflags(a->fd, a->st.st_flags) != 0) { 953 archive_set_error(&a->archive, errno, 954 "Failed to set UF_COMPRESSED file flag"); 955 return (ARCHIVE_WARN); 956 } 957 return (ARCHIVE_OK); 958} 959 960/* 961 * HFS+ Compression decmpfs 962 * 963 * +------------------------------+ +0 964 * | Magic(LE 4 bytes) | 965 * +------------------------------+ 966 * | Type(LE 4 bytes) | 967 * +------------------------------+ 968 * | Uncompressed size(LE 8 bytes)| 969 * +------------------------------+ +16 970 * | | 971 * | Compressed data | 972 * | (Placed only if Type == 3) | 973 * | | 974 * +------------------------------+ +3802 = MAX_DECMPFS_XATTR_SIZE 975 * 976 * Type is 3: decmpfs has compressed data. 977 * Type is 4: Resource Fork has compressed data. 978 */ 979/* 980 * Write "com.apple.decmpfs" 981 */ 982static int 983hfs_write_decmpfs(struct archive_write_disk *a) 984{ 985 int r; 986 uint32_t compression_type; 987 988 r = fsetxattr(a->fd, DECMPFS_XATTR_NAME, a->decmpfs_header_p, 989 a->decmpfs_attr_size, 0, 0); 990 if (r < 0) { 991 archive_set_error(&a->archive, errno, 992 "Cannot restore xattr:%s", DECMPFS_XATTR_NAME); 993 compression_type = archive_le32dec( 994 &a->decmpfs_header_p[DECMPFS_COMPRESSION_TYPE]); 995 if (compression_type == CMP_RESOURCE_FORK) 996 fremovexattr(a->fd, XATTR_RESOURCEFORK_NAME, 997 XATTR_SHOWCOMPRESSION); 998 return (ARCHIVE_WARN); 999 } 1000 return (ARCHIVE_OK); 1001} 1002 1003/* 1004 * HFS+ Compression Resource Fork 1005 * 1006 * +-----------------------------+ 1007 * | Header(260 bytes) | 1008 * +-----------------------------+ 1009 * | Block count(LE 4 bytes) | 1010 * +-----------------------------+ --+ 1011 * +-- | Offset (LE 4 bytes) | | 1012 * | | [distance from Block count] | | Block 0 1013 * | +-----------------------------+ | 1014 * | | Compressed size(LE 4 bytes) | | 1015 * | +-----------------------------+ --+ 1016 * | | | 1017 * | | .................. | 1018 * | | | 1019 * | +-----------------------------+ --+ 1020 * | | Offset (LE 4 bytes) | | 1021 * | +-----------------------------+ | Block (Block count -1) 1022 * | | Compressed size(LE 4 bytes) | | 1023 * +-> +-----------------------------+ --+ 1024 * | Compressed data(n bytes) | Block 0 1025 * +-----------------------------+ 1026 * | | 1027 * | .................. | 1028 * | | 1029 * +-----------------------------+ 1030 * | Compressed data(n bytes) | Block (Block count -1) 1031 * +-----------------------------+ 1032 * | Footer(50 bytes) | 1033 * +-----------------------------+ 1034 * 1035 */ 1036/* 1037 * Write the header of "com.apple.ResourceFork" 1038 */ 1039static int 1040hfs_write_resource_fork(struct archive_write_disk *a, unsigned char *buff, 1041 size_t bytes, uint32_t position) 1042{ 1043 int ret; 1044 1045 ret = fsetxattr(a->fd, XATTR_RESOURCEFORK_NAME, buff, bytes, 1046 position, a->rsrc_xattr_options); 1047 if (ret < 0) { 1048 archive_set_error(&a->archive, errno, 1049 "Cannot restore xattr: %s at %u pos %u bytes", 1050 XATTR_RESOURCEFORK_NAME, 1051 (unsigned)position, 1052 (unsigned)bytes); 1053 return (ARCHIVE_WARN); 1054 } 1055 a->rsrc_xattr_options &= ~XATTR_CREATE; 1056 return (ARCHIVE_OK); 1057} 1058 1059static int 1060hfs_write_compressed_data(struct archive_write_disk *a, size_t bytes_compressed) 1061{ 1062 int ret; 1063 1064 ret = hfs_write_resource_fork(a, a->compressed_buffer, 1065 bytes_compressed, a->compressed_rsrc_position); 1066 if (ret == ARCHIVE_OK) 1067 a->compressed_rsrc_position += bytes_compressed; 1068 return (ret); 1069} 1070 1071static int 1072hfs_write_resource_fork_header(struct archive_write_disk *a) 1073{ 1074 unsigned char *buff; 1075 uint32_t rsrc_bytes; 1076 uint32_t rsrc_header_bytes; 1077 1078 /* 1079 * Write resource fork header + block info. 1080 */ 1081 buff = a->resource_fork; 1082 rsrc_bytes = a->compressed_rsrc_position - RSRC_F_SIZE; 1083 rsrc_header_bytes = 1084 RSRC_H_SIZE + /* Header base size. */ 1085 4 + /* Block count. */ 1086 (a->decmpfs_block_count * 8);/* Block info */ 1087 archive_be32enc(buff, 0x100); 1088 archive_be32enc(buff + 4, rsrc_bytes); 1089 archive_be32enc(buff + 8, rsrc_bytes - 256); 1090 archive_be32enc(buff + 12, 0x32); 1091 memset(buff + 16, 0, 240); 1092 archive_be32enc(buff + 256, rsrc_bytes - 260); 1093 return hfs_write_resource_fork(a, buff, rsrc_header_bytes, 0); 1094} 1095 1096static size_t 1097hfs_set_resource_fork_footer(unsigned char *buff, size_t buff_size) 1098{ 1099 static const char rsrc_footer[RSRC_F_SIZE] = { 1100 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 1101 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 1102 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 1103 0x00, 0x1c, 0x00, 0x32, 0x00, 0x00, 'c', 'm', 1104 'p', 'f', 0x00, 0x00, 0x00, 0x0a, 0x00, 0x01, 1105 0xff, 0xff, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 1106 0x00, 0x00 1107 }; 1108 if (buff_size < sizeof(rsrc_footer)) 1109 return (0); 1110 memcpy(buff, rsrc_footer, sizeof(rsrc_footer)); 1111 return (sizeof(rsrc_footer)); 1112} 1113 1114static int 1115hfs_reset_compressor(struct archive_write_disk *a) 1116{ 1117 int ret; 1118 1119 if (a->stream_valid) 1120 ret = deflateReset(&a->stream); 1121 else 1122 ret = deflateInit(&a->stream, a->decmpfs_compression_level); 1123 1124 if (ret != Z_OK) { 1125 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 1126 "Failed to initialize compressor"); 1127 return (ARCHIVE_FATAL); 1128 } else 1129 a->stream_valid = 1; 1130 1131 return (ARCHIVE_OK); 1132} 1133 1134static int 1135hfs_decompress(struct archive_write_disk *a) 1136{ 1137 uint32_t *block_info; 1138 unsigned int block_count; 1139 uint32_t data_pos, data_size; 1140 ssize_t r; 1141 ssize_t bytes_written, bytes_to_write; 1142 unsigned char *b; 1143 1144 block_info = (uint32_t *)(a->resource_fork + RSRC_H_SIZE); 1145 block_count = archive_le32dec(block_info++); 1146 while (block_count--) { 1147 data_pos = RSRC_H_SIZE + archive_le32dec(block_info++); 1148 data_size = archive_le32dec(block_info++); 1149 r = fgetxattr(a->fd, XATTR_RESOURCEFORK_NAME, 1150 a->compressed_buffer, data_size, data_pos, 0); 1151 if (r != data_size) { 1152 archive_set_error(&a->archive, 1153 (r < 0)?errno:ARCHIVE_ERRNO_MISC, 1154 "Failed to read resource fork"); 1155 return (ARCHIVE_WARN); 1156 } 1157 if (a->compressed_buffer[0] == 0xff) { 1158 bytes_to_write = data_size -1; 1159 b = a->compressed_buffer + 1; 1160 } else { 1161 uLong dest_len = MAX_DECMPFS_BLOCK_SIZE; 1162 int zr; 1163 1164 zr = uncompress((Bytef *)a->uncompressed_buffer, 1165 &dest_len, a->compressed_buffer, data_size); 1166 if (zr != Z_OK) { 1167 archive_set_error(&a->archive, 1168 ARCHIVE_ERRNO_MISC, 1169 "Failed to decompress resource fork"); 1170 return (ARCHIVE_WARN); 1171 } 1172 bytes_to_write = dest_len; 1173 b = (unsigned char *)a->uncompressed_buffer; 1174 } 1175 do { 1176 bytes_written = write(a->fd, b, bytes_to_write); 1177 if (bytes_written < 0) { 1178 archive_set_error(&a->archive, errno, 1179 "Write failed"); 1180 return (ARCHIVE_WARN); 1181 } 1182 bytes_to_write -= bytes_written; 1183 b += bytes_written; 1184 } while (bytes_to_write > 0); 1185 } 1186 r = fremovexattr(a->fd, XATTR_RESOURCEFORK_NAME, 0); 1187 if (r == -1) { 1188 archive_set_error(&a->archive, errno, 1189 "Failed to remove resource fork"); 1190 return (ARCHIVE_WARN); 1191 } 1192 return (ARCHIVE_OK); 1193} 1194 1195static int 1196hfs_drive_compressor(struct archive_write_disk *a, const char *buff, 1197 size_t size) 1198{ 1199 unsigned char *buffer_compressed; 1200 size_t bytes_compressed; 1201 size_t bytes_used; 1202 int ret; 1203 1204 ret = hfs_reset_compressor(a); 1205 if (ret != ARCHIVE_OK) 1206 return (ret); 1207 1208 if (a->compressed_buffer == NULL) { 1209 size_t block_size; 1210 1211 block_size = COMPRESSED_W_SIZE + RSRC_F_SIZE + 1212 + compressBound(MAX_DECMPFS_BLOCK_SIZE); 1213 a->compressed_buffer = malloc(block_size); 1214 if (a->compressed_buffer == NULL) { 1215 archive_set_error(&a->archive, ENOMEM, 1216 "Can't allocate memory for Resource Fork"); 1217 return (ARCHIVE_FATAL); 1218 } 1219 a->compressed_buffer_size = block_size; 1220 a->compressed_buffer_remaining = block_size; 1221 } 1222 1223 buffer_compressed = a->compressed_buffer + 1224 a->compressed_buffer_size - a->compressed_buffer_remaining; 1225 a->stream.next_in = (Bytef *)(uintptr_t)(const void *)buff; 1226 a->stream.avail_in = size; 1227 a->stream.next_out = buffer_compressed; 1228 a->stream.avail_out = a->compressed_buffer_remaining; 1229 do { 1230 ret = deflate(&a->stream, Z_FINISH); 1231 switch (ret) { 1232 case Z_OK: 1233 case Z_STREAM_END: 1234 break; 1235 default: 1236 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 1237 "Failed to compress data"); 1238 return (ARCHIVE_FAILED); 1239 } 1240 } while (ret == Z_OK); 1241 bytes_compressed = a->compressed_buffer_remaining - a->stream.avail_out; 1242 1243 /* 1244 * If the compressed size is larger than the original size, 1245 * throw away compressed data, use uncompressed data instead. 1246 */ 1247 if (bytes_compressed > size) { 1248 buffer_compressed[0] = 0xFF;/* uncompressed marker. */ 1249 memcpy(buffer_compressed + 1, buff, size); 1250 bytes_compressed = size + 1; 1251 } 1252 a->compressed_buffer_remaining -= bytes_compressed; 1253 1254 /* 1255 * If the compressed size is smaller than MAX_DECMPFS_XATTR_SIZE 1256 * and the block count in the file is only one, store compressed 1257 * data to decmpfs xattr instead of the resource fork. 1258 */ 1259 if (a->decmpfs_block_count == 1 && 1260 (a->decmpfs_attr_size + bytes_compressed) 1261 <= MAX_DECMPFS_XATTR_SIZE) { 1262 archive_le32enc(&a->decmpfs_header_p[DECMPFS_COMPRESSION_TYPE], 1263 CMP_XATTR); 1264 memcpy(a->decmpfs_header_p + DECMPFS_HEADER_SIZE, 1265 buffer_compressed, bytes_compressed); 1266 a->decmpfs_attr_size += bytes_compressed; 1267 a->compressed_buffer_remaining = a->compressed_buffer_size; 1268 /* 1269 * Finish HFS+ Compression. 1270 * - Write the decmpfs xattr. 1271 * - Set the UF_COMPRESSED file flag. 1272 */ 1273 ret = hfs_write_decmpfs(a); 1274 if (ret == ARCHIVE_OK) 1275 ret = hfs_set_compressed_fflag(a); 1276 return (ret); 1277 } 1278 1279 /* Update block info. */ 1280 archive_le32enc(a->decmpfs_block_info++, 1281 a->compressed_rsrc_position_v - RSRC_H_SIZE); 1282 archive_le32enc(a->decmpfs_block_info++, bytes_compressed); 1283 a->compressed_rsrc_position_v += bytes_compressed; 1284 1285 /* 1286 * Write the compressed data to the resource fork. 1287 */ 1288 bytes_used = a->compressed_buffer_size - a->compressed_buffer_remaining; 1289 while (bytes_used >= COMPRESSED_W_SIZE) { 1290 ret = hfs_write_compressed_data(a, COMPRESSED_W_SIZE); 1291 if (ret != ARCHIVE_OK) 1292 return (ret); 1293 bytes_used -= COMPRESSED_W_SIZE; 1294 if (bytes_used > COMPRESSED_W_SIZE) 1295 memmove(a->compressed_buffer, 1296 a->compressed_buffer + COMPRESSED_W_SIZE, 1297 bytes_used); 1298 else 1299 memcpy(a->compressed_buffer, 1300 a->compressed_buffer + COMPRESSED_W_SIZE, 1301 bytes_used); 1302 } 1303 a->compressed_buffer_remaining = a->compressed_buffer_size - bytes_used; 1304 1305 /* 1306 * If the current block is the last block, write the remaining 1307 * compressed data and the resource fork footer. 1308 */ 1309 if (a->file_remaining_bytes == 0) { 1310 size_t rsrc_size; 1311 int64_t bk; 1312 1313 /* Append the resource footer. */ 1314 rsrc_size = hfs_set_resource_fork_footer( 1315 a->compressed_buffer + bytes_used, 1316 a->compressed_buffer_remaining); 1317 ret = hfs_write_compressed_data(a, bytes_used + rsrc_size); 1318 a->compressed_buffer_remaining = a->compressed_buffer_size; 1319 1320 /* If the compressed size is not enough smaller than 1321 * the uncompressed size. cancel HFS+ compression. 1322 * TODO: study a behavior of ditto utility and improve 1323 * the condition to fall back into no HFS+ compression. */ 1324 bk = HFS_BLOCKS(a->compressed_rsrc_position); 1325 bk += bk >> 7; 1326 if (bk > HFS_BLOCKS(a->filesize)) 1327 return hfs_decompress(a); 1328 /* 1329 * Write the resourcefork header. 1330 */ 1331 if (ret == ARCHIVE_OK) 1332 ret = hfs_write_resource_fork_header(a); 1333 /* 1334 * Finish HFS+ Compression. 1335 * - Write the decmpfs xattr. 1336 * - Set the UF_COMPRESSED file flag. 1337 */ 1338 if (ret == ARCHIVE_OK) 1339 ret = hfs_write_decmpfs(a); 1340 if (ret == ARCHIVE_OK) 1341 ret = hfs_set_compressed_fflag(a); 1342 } 1343 return (ret); 1344} 1345 1346static ssize_t 1347hfs_write_decmpfs_block(struct archive_write_disk *a, const char *buff, 1348 size_t size) 1349{ 1350 const char *buffer_to_write; 1351 size_t bytes_to_write; 1352 int ret; 1353 1354 if (a->decmpfs_block_count == (unsigned)-1) { 1355 void *new_block; 1356 size_t new_size; 1357 unsigned int block_count; 1358 1359 if (a->decmpfs_header_p == NULL) { 1360 new_block = malloc(MAX_DECMPFS_XATTR_SIZE 1361 + sizeof(uint32_t)); 1362 if (new_block == NULL) { 1363 archive_set_error(&a->archive, ENOMEM, 1364 "Can't allocate memory for decmpfs"); 1365 return (ARCHIVE_FATAL); 1366 } 1367 a->decmpfs_header_p = new_block; 1368 } 1369 a->decmpfs_attr_size = DECMPFS_HEADER_SIZE; 1370 archive_le32enc(&a->decmpfs_header_p[DECMPFS_COMPRESSION_MAGIC], 1371 DECMPFS_MAGIC); 1372 archive_le32enc(&a->decmpfs_header_p[DECMPFS_COMPRESSION_TYPE], 1373 CMP_RESOURCE_FORK); 1374 archive_le64enc(&a->decmpfs_header_p[DECMPFS_UNCOMPRESSED_SIZE], 1375 a->filesize); 1376 1377 /* Calculate a block count of the file. */ 1378 block_count = 1379 (a->filesize + MAX_DECMPFS_BLOCK_SIZE -1) / 1380 MAX_DECMPFS_BLOCK_SIZE; 1381 /* 1382 * Allocate buffer for resource fork. 1383 * Set up related pointers; 1384 */ 1385 new_size = 1386 RSRC_H_SIZE + /* header */ 1387 4 + /* Block count */ 1388 (block_count * sizeof(uint32_t) * 2) + 1389 RSRC_F_SIZE; /* footer */ 1390 if (new_size > a->resource_fork_allocated_size) { 1391 new_block = realloc(a->resource_fork, new_size); 1392 if (new_block == NULL) { 1393 archive_set_error(&a->archive, ENOMEM, 1394 "Can't allocate memory for ResourceFork"); 1395 return (ARCHIVE_FATAL); 1396 } 1397 a->resource_fork_allocated_size = new_size; 1398 a->resource_fork = new_block; 1399 } 1400 1401 /* Allocate uncompressed buffer */ 1402 if (a->uncompressed_buffer == NULL) { 1403 new_block = malloc(MAX_DECMPFS_BLOCK_SIZE); 1404 if (new_block == NULL) { 1405 archive_set_error(&a->archive, ENOMEM, 1406 "Can't allocate memory for decmpfs"); 1407 return (ARCHIVE_FATAL); 1408 } 1409 a->uncompressed_buffer = new_block; 1410 } 1411 a->block_remaining_bytes = MAX_DECMPFS_BLOCK_SIZE; 1412 a->file_remaining_bytes = a->filesize; 1413 a->compressed_buffer_remaining = a->compressed_buffer_size; 1414 1415 /* 1416 * Set up a resource fork. 1417 */ 1418 a->rsrc_xattr_options = XATTR_CREATE; 1419 /* Get the position where we are going to set a bunch 1420 * of block info. */ 1421 a->decmpfs_block_info = 1422 (uint32_t *)(a->resource_fork + RSRC_H_SIZE); 1423 /* Set the block count to the resource fork. */ 1424 archive_le32enc(a->decmpfs_block_info++, block_count); 1425 /* Get the position where we are going to set compressed 1426 * data. */ 1427 a->compressed_rsrc_position = 1428 RSRC_H_SIZE + 4 + (block_count * 8); 1429 a->compressed_rsrc_position_v = a->compressed_rsrc_position; 1430 a->decmpfs_block_count = block_count; 1431 } 1432 1433 /* Ignore redundant bytes. */ 1434 if (a->file_remaining_bytes == 0) 1435 return ((ssize_t)size); 1436 1437 /* Do not overrun a block size. */ 1438 if (size > a->block_remaining_bytes) 1439 bytes_to_write = a->block_remaining_bytes; 1440 else 1441 bytes_to_write = size; 1442 /* Do not overrun the file size. */ 1443 if (bytes_to_write > a->file_remaining_bytes) 1444 bytes_to_write = a->file_remaining_bytes; 1445 1446 /* For efficiency, if a copy length is full of the uncompressed 1447 * buffer size, do not copy writing data to it. */ 1448 if (bytes_to_write == MAX_DECMPFS_BLOCK_SIZE) 1449 buffer_to_write = buff; 1450 else { 1451 memcpy(a->uncompressed_buffer + 1452 MAX_DECMPFS_BLOCK_SIZE - a->block_remaining_bytes, 1453 buff, bytes_to_write); 1454 buffer_to_write = a->uncompressed_buffer; 1455 } 1456 a->block_remaining_bytes -= bytes_to_write; 1457 a->file_remaining_bytes -= bytes_to_write; 1458 1459 if (a->block_remaining_bytes == 0 || a->file_remaining_bytes == 0) { 1460 ret = hfs_drive_compressor(a, buffer_to_write, 1461 MAX_DECMPFS_BLOCK_SIZE - a->block_remaining_bytes); 1462 if (ret < 0) 1463 return (ret); 1464 a->block_remaining_bytes = MAX_DECMPFS_BLOCK_SIZE; 1465 } 1466 /* Ignore redundant bytes. */ 1467 if (a->file_remaining_bytes == 0) 1468 return ((ssize_t)size); 1469 return (bytes_to_write); 1470} 1471 1472static ssize_t 1473hfs_write_data_block(struct archive_write_disk *a, const char *buff, 1474 size_t size) 1475{ 1476 uint64_t start_size = size; 1477 ssize_t bytes_written = 0; 1478 ssize_t bytes_to_write; 1479 1480 if (size == 0) 1481 return (ARCHIVE_OK); 1482 1483 if (a->filesize == 0 || a->fd < 0) { 1484 archive_set_error(&a->archive, 0, 1485 "Attempt to write to an empty file"); 1486 return (ARCHIVE_WARN); 1487 } 1488 1489 /* If this write would run beyond the file size, truncate it. */ 1490 if (a->filesize >= 0 && (int64_t)(a->offset + size) > a->filesize) 1491 start_size = size = (size_t)(a->filesize - a->offset); 1492 1493 /* Write the data. */ 1494 while (size > 0) { 1495 bytes_to_write = size; 1496 /* Seek if necessary to the specified offset. */ 1497 if (a->offset < a->fd_offset) { 1498 /* Can't support backward move. */ 1499 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 1500 "Seek failed"); 1501 return (ARCHIVE_FATAL); 1502 } else if (a->offset > a->fd_offset) { 1503 int64_t skip = a->offset - a->fd_offset; 1504 char nullblock[1024]; 1505 1506 memset(nullblock, 0, sizeof(nullblock)); 1507 while (skip > 0) { 1508 if (skip > (int64_t)sizeof(nullblock)) 1509 bytes_written = hfs_write_decmpfs_block( 1510 a, nullblock, sizeof(nullblock)); 1511 else 1512 bytes_written = hfs_write_decmpfs_block( 1513 a, nullblock, skip); 1514 if (bytes_written < 0) { 1515 archive_set_error(&a->archive, errno, 1516 "Write failed"); 1517 return (ARCHIVE_WARN); 1518 } 1519 skip -= bytes_written; 1520 } 1521 1522 a->fd_offset = a->offset; 1523 } 1524 bytes_written = 1525 hfs_write_decmpfs_block(a, buff, bytes_to_write); 1526 if (bytes_written < 0) 1527 return (bytes_written); 1528 buff += bytes_written; 1529 size -= bytes_written; 1530 a->total_bytes_written += bytes_written; 1531 a->offset += bytes_written; 1532 a->fd_offset = a->offset; 1533 } 1534 return (start_size - size); 1535} 1536#else 1537static ssize_t 1538hfs_write_data_block(struct archive_write_disk *a, const char *buff, 1539 size_t size) 1540{ 1541 return (write_data_block(a, buff, size)); 1542} 1543#endif 1544 1545static ssize_t 1546_archive_write_disk_data_block(struct archive *_a, 1547 const void *buff, size_t size, int64_t offset) 1548{ 1549 struct archive_write_disk *a = (struct archive_write_disk *)_a; 1550 ssize_t r; 1551 1552 archive_check_magic(&a->archive, ARCHIVE_WRITE_DISK_MAGIC, 1553 ARCHIVE_STATE_DATA, "archive_write_data_block"); 1554 1555 a->offset = offset; 1556 if (a->todo & TODO_HFS_COMPRESSION) 1557 r = hfs_write_data_block(a, buff, size); 1558 else 1559 r = write_data_block(a, buff, size); 1560 if (r < ARCHIVE_OK) 1561 return (r); 1562 if ((size_t)r < size) { 1563 archive_set_error(&a->archive, 0, 1564 "Too much data: Truncating file at %ju bytes", 1565 (uintmax_t)a->filesize); 1566 return (ARCHIVE_WARN); 1567 } 1568#if ARCHIVE_VERSION_NUMBER < 3999000 1569 return (ARCHIVE_OK); 1570#else 1571 return (size); 1572#endif 1573} 1574 1575static ssize_t 1576_archive_write_disk_data(struct archive *_a, const void *buff, size_t size) 1577{ 1578 struct archive_write_disk *a = (struct archive_write_disk *)_a; 1579 1580 archive_check_magic(&a->archive, ARCHIVE_WRITE_DISK_MAGIC, 1581 ARCHIVE_STATE_DATA, "archive_write_data"); 1582 1583 if (a->todo & TODO_HFS_COMPRESSION) 1584 return (hfs_write_data_block(a, buff, size)); 1585 return (write_data_block(a, buff, size)); 1586} 1587 1588static int 1589_archive_write_disk_finish_entry(struct archive *_a) 1590{ 1591 struct archive_write_disk *a = (struct archive_write_disk *)_a; 1592 int ret = ARCHIVE_OK; 1593 1594 archive_check_magic(&a->archive, ARCHIVE_WRITE_DISK_MAGIC, 1595 ARCHIVE_STATE_HEADER | ARCHIVE_STATE_DATA, 1596 "archive_write_finish_entry"); 1597 if (a->archive.state & ARCHIVE_STATE_HEADER) 1598 return (ARCHIVE_OK); 1599 archive_clear_error(&a->archive); 1600 1601 /* Pad or truncate file to the right size. */ 1602 if (a->fd < 0) { 1603 /* There's no file. */ 1604 } else if (a->filesize < 0) { 1605 /* File size is unknown, so we can't set the size. */ 1606 } else if (a->fd_offset == a->filesize) { 1607 /* Last write ended at exactly the filesize; we're done. */ 1608 /* Hopefully, this is the common case. */ 1609#if defined(__APPLE__) && defined(UF_COMPRESSED) && defined(HAVE_ZLIB_H) 1610 } else if (a->todo & TODO_HFS_COMPRESSION) { 1611 char null_d[1024]; 1612 ssize_t r; 1613 1614 if (a->file_remaining_bytes) 1615 memset(null_d, 0, sizeof(null_d)); 1616 while (a->file_remaining_bytes) { 1617 if (a->file_remaining_bytes > sizeof(null_d)) 1618 r = hfs_write_data_block( 1619 a, null_d, sizeof(null_d)); 1620 else 1621 r = hfs_write_data_block( 1622 a, null_d, a->file_remaining_bytes); 1623 if (r < 0) 1624 return ((int)r); 1625 } 1626#endif 1627 } else { 1628#if HAVE_FTRUNCATE 1629 if (ftruncate(a->fd, a->filesize) == -1 && 1630 a->filesize == 0) { 1631 archive_set_error(&a->archive, errno, 1632 "File size could not be restored"); 1633 return (ARCHIVE_FAILED); 1634 } 1635#endif 1636 /* 1637 * Not all platforms implement the XSI option to 1638 * extend files via ftruncate. Stat() the file again 1639 * to see what happened. 1640 */ 1641 a->pst = NULL; 1642 if ((ret = lazy_stat(a)) != ARCHIVE_OK) 1643 return (ret); 1644 /* We can use lseek()/write() to extend the file if 1645 * ftruncate didn't work or isn't available. */ 1646 if (a->st.st_size < a->filesize) { 1647 const char nul = '\0'; 1648 if (lseek(a->fd, a->filesize - 1, SEEK_SET) < 0) { 1649 archive_set_error(&a->archive, errno, 1650 "Seek failed"); 1651 return (ARCHIVE_FATAL); 1652 } 1653 if (write(a->fd, &nul, 1) < 0) { 1654 archive_set_error(&a->archive, errno, 1655 "Write to restore size failed"); 1656 return (ARCHIVE_FATAL); 1657 } 1658 a->pst = NULL; 1659 } 1660 } 1661 1662 /* Restore metadata. */ 1663 1664 /* 1665 * This is specific to Mac OS X. 1666 * If the current file is an AppleDouble file, it should be 1667 * linked with the data fork file and remove it. 1668 */ 1669 if (a->todo & TODO_APPLEDOUBLE) { 1670 int r2 = fixup_appledouble(a, a->name); 1671 if (r2 == ARCHIVE_EOF) { 1672 /* The current file has been successfully linked 1673 * with the data fork file and removed. So there 1674 * is nothing to do on the current file. */ 1675 goto finish_metadata; 1676 } 1677 if (r2 < ret) ret = r2; 1678 } 1679 1680 /* 1681 * Look up the "real" UID only if we're going to need it. 1682 * TODO: the TODO_SGID condition can be dropped here, can't it? 1683 */ 1684 if (a->todo & (TODO_OWNER | TODO_SUID | TODO_SGID)) { 1685 a->uid = archive_write_disk_uid(&a->archive, 1686 archive_entry_uname(a->entry), 1687 archive_entry_uid(a->entry)); 1688 } 1689 /* Look up the "real" GID only if we're going to need it. */ 1690 /* TODO: the TODO_SUID condition can be dropped here, can't it? */ 1691 if (a->todo & (TODO_OWNER | TODO_SGID | TODO_SUID)) { 1692 a->gid = archive_write_disk_gid(&a->archive, 1693 archive_entry_gname(a->entry), 1694 archive_entry_gid(a->entry)); 1695 } 1696 1697 /* 1698 * Restore ownership before set_mode tries to restore suid/sgid 1699 * bits. If we set the owner, we know what it is and can skip 1700 * a stat() call to examine the ownership of the file on disk. 1701 */ 1702 if (a->todo & TODO_OWNER) { 1703 int r2 = set_ownership(a); 1704 if (r2 < ret) ret = r2; 1705 } 1706 1707 /* 1708 * set_mode must precede ACLs on systems such as Solaris and 1709 * FreeBSD where setting the mode implicitly clears extended ACLs 1710 */ 1711 if (a->todo & TODO_MODE) { 1712 int r2 = set_mode(a, a->mode); 1713 if (r2 < ret) ret = r2; 1714 } 1715 1716 /* 1717 * Security-related extended attributes (such as 1718 * security.capability on Linux) have to be restored last, 1719 * since they're implicitly removed by other file changes. 1720 */ 1721 if (a->todo & TODO_XATTR) { 1722 int r2 = set_xattrs(a); 1723 if (r2 < ret) ret = r2; 1724 } 1725 1726 /* 1727 * Some flags prevent file modification; they must be restored after 1728 * file contents are written. 1729 */ 1730 if (a->todo & TODO_FFLAGS) { 1731 int r2 = set_fflags(a); 1732 if (r2 < ret) ret = r2; 1733 } 1734 1735 /* 1736 * Time must follow most other metadata; 1737 * otherwise atime will get changed. 1738 */ 1739 if (a->todo & TODO_TIMES) { 1740 int r2 = set_times_from_entry(a); 1741 if (r2 < ret) ret = r2; 1742 } 1743 1744 /* 1745 * Mac extended metadata includes ACLs. 1746 */ 1747 if (a->todo & TODO_MAC_METADATA) { 1748 const void *metadata; 1749 size_t metadata_size; 1750 metadata = archive_entry_mac_metadata(a->entry, &metadata_size); 1751 if (metadata != NULL && metadata_size > 0) { 1752 int r2 = set_mac_metadata(a, archive_entry_pathname( 1753 a->entry), metadata, metadata_size); 1754 if (r2 < ret) ret = r2; 1755 } 1756 } 1757 1758 /* 1759 * ACLs must be restored after timestamps because there are 1760 * ACLs that prevent attribute changes (including time). 1761 */ 1762 if (a->todo & TODO_ACLS) { 1763 int r2; 1764 r2 = archive_write_disk_set_acls(&a->archive, a->fd, 1765 archive_entry_pathname(a->entry), 1766 archive_entry_acl(a->entry), 1767 archive_entry_mode(a->entry)); 1768 if (r2 < ret) ret = r2; 1769 } 1770 1771finish_metadata: 1772 /* If there's an fd, we can close it now. */ 1773 if (a->fd >= 0) { 1774 close(a->fd); 1775 a->fd = -1; 1776 } 1777 /* If there's an entry, we can release it now. */ 1778 if (a->entry) { 1779 archive_entry_free(a->entry); 1780 a->entry = NULL; 1781 } 1782 a->archive.state = ARCHIVE_STATE_HEADER; 1783 return (ret); 1784} 1785 1786int 1787archive_write_disk_set_group_lookup(struct archive *_a, 1788 void *private_data, 1789 int64_t (*lookup_gid)(void *private, const char *gname, int64_t gid), 1790 void (*cleanup_gid)(void *private)) 1791{ 1792 struct archive_write_disk *a = (struct archive_write_disk *)_a; 1793 archive_check_magic(&a->archive, ARCHIVE_WRITE_DISK_MAGIC, 1794 ARCHIVE_STATE_ANY, "archive_write_disk_set_group_lookup"); 1795 1796 if (a->cleanup_gid != NULL && a->lookup_gid_data != NULL) 1797 (a->cleanup_gid)(a->lookup_gid_data); 1798 1799 a->lookup_gid = lookup_gid; 1800 a->cleanup_gid = cleanup_gid; 1801 a->lookup_gid_data = private_data; 1802 return (ARCHIVE_OK); 1803} 1804 1805int 1806archive_write_disk_set_user_lookup(struct archive *_a, 1807 void *private_data, 1808 int64_t (*lookup_uid)(void *private, const char *uname, int64_t uid), 1809 void (*cleanup_uid)(void *private)) 1810{ 1811 struct archive_write_disk *a = (struct archive_write_disk *)_a; 1812 archive_check_magic(&a->archive, ARCHIVE_WRITE_DISK_MAGIC, 1813 ARCHIVE_STATE_ANY, "archive_write_disk_set_user_lookup"); 1814 1815 if (a->cleanup_uid != NULL && a->lookup_uid_data != NULL) 1816 (a->cleanup_uid)(a->lookup_uid_data); 1817 1818 a->lookup_uid = lookup_uid; 1819 a->cleanup_uid = cleanup_uid; 1820 a->lookup_uid_data = private_data; 1821 return (ARCHIVE_OK); 1822} 1823 1824int64_t 1825archive_write_disk_gid(struct archive *_a, const char *name, int64_t id) 1826{ 1827 struct archive_write_disk *a = (struct archive_write_disk *)_a; 1828 archive_check_magic(&a->archive, ARCHIVE_WRITE_DISK_MAGIC, 1829 ARCHIVE_STATE_ANY, "archive_write_disk_gid"); 1830 if (a->lookup_gid) 1831 return (a->lookup_gid)(a->lookup_gid_data, name, id); 1832 return (id); 1833} 1834 1835int64_t 1836archive_write_disk_uid(struct archive *_a, const char *name, int64_t id) 1837{ 1838 struct archive_write_disk *a = (struct archive_write_disk *)_a; 1839 archive_check_magic(&a->archive, ARCHIVE_WRITE_DISK_MAGIC, 1840 ARCHIVE_STATE_ANY, "archive_write_disk_uid"); 1841 if (a->lookup_uid) 1842 return (a->lookup_uid)(a->lookup_uid_data, name, id); 1843 return (id); 1844} 1845 1846/* 1847 * Create a new archive_write_disk object and initialize it with global state. 1848 */ 1849struct archive * 1850archive_write_disk_new(void) 1851{ 1852 struct archive_write_disk *a; 1853 1854 a = (struct archive_write_disk *)calloc(1, sizeof(*a)); 1855 if (a == NULL) 1856 return (NULL); 1857 a->archive.magic = ARCHIVE_WRITE_DISK_MAGIC; 1858 /* We're ready to write a header immediately. */ 1859 a->archive.state = ARCHIVE_STATE_HEADER; 1860 a->archive.vtable = archive_write_disk_vtable(); 1861 a->start_time = time(NULL); 1862 /* Query and restore the umask. */ 1863 umask(a->user_umask = umask(0)); 1864#ifdef HAVE_GETEUID 1865 a->user_uid = geteuid(); 1866#endif /* HAVE_GETEUID */ 1867 if (archive_string_ensure(&a->path_safe, 512) == NULL) { 1868 free(a); 1869 return (NULL); 1870 } 1871#ifdef HAVE_ZLIB_H 1872 a->decmpfs_compression_level = 5; 1873#endif 1874 return (&a->archive); 1875} 1876 1877 1878/* 1879 * If pathname is longer than PATH_MAX, chdir to a suitable 1880 * intermediate dir and edit the path down to a shorter suffix. Note 1881 * that this routine never returns an error; if the chdir() attempt 1882 * fails for any reason, we just go ahead with the long pathname. The 1883 * object creation is likely to fail, but any error will get handled 1884 * at that time. 1885 */ 1886#if defined(HAVE_FCHDIR) && defined(PATH_MAX) 1887static void 1888edit_deep_directories(struct archive_write_disk *a) 1889{ 1890 int ret; 1891 char *tail = a->name; 1892 1893 /* If path is short, avoid the open() below. */ 1894 if (strlen(tail) < PATH_MAX) 1895 return; 1896 1897 /* Try to record our starting dir. */ 1898 a->restore_pwd = open(".", O_RDONLY | O_BINARY | O_CLOEXEC); 1899 __archive_ensure_cloexec_flag(a->restore_pwd); 1900 if (a->restore_pwd < 0) 1901 return; 1902 1903 /* As long as the path is too long... */ 1904 while (strlen(tail) >= PATH_MAX) { 1905 /* Locate a dir prefix shorter than PATH_MAX. */ 1906 tail += PATH_MAX - 8; 1907 while (tail > a->name && *tail != '/') 1908 tail--; 1909 /* Exit if we find a too-long path component. */ 1910 if (tail <= a->name) 1911 return; 1912 /* Create the intermediate dir and chdir to it. */ 1913 *tail = '\0'; /* Terminate dir portion */ 1914 ret = create_dir(a, a->name); 1915 if (ret == ARCHIVE_OK && chdir(a->name) != 0) 1916 ret = ARCHIVE_FAILED; 1917 *tail = '/'; /* Restore the / we removed. */ 1918 if (ret != ARCHIVE_OK) 1919 return; 1920 tail++; 1921 /* The chdir() succeeded; we've now shortened the path. */ 1922 a->name = tail; 1923 } 1924 return; 1925} 1926#endif 1927 1928/* 1929 * The main restore function. 1930 */ 1931static int 1932restore_entry(struct archive_write_disk *a) 1933{ 1934 int ret = ARCHIVE_OK, en; 1935 1936 if (a->flags & ARCHIVE_EXTRACT_UNLINK && !S_ISDIR(a->mode)) { 1937 /* 1938 * TODO: Fix this. Apparently, there are platforms 1939 * that still allow root to hose the entire filesystem 1940 * by unlinking a dir. The S_ISDIR() test above 1941 * prevents us from using unlink() here if the new 1942 * object is a dir, but that doesn't mean the old 1943 * object isn't a dir. 1944 */ 1945 if (a->flags & ARCHIVE_EXTRACT_CLEAR_NOCHANGE_FFLAGS) 1946 (void)clear_nochange_fflags(a); 1947 if (unlink(a->name) == 0) { 1948 /* We removed it, reset cached stat. */ 1949 a->pst = NULL; 1950 } else if (errno == ENOENT) { 1951 /* File didn't exist, that's just as good. */ 1952 } else if (rmdir(a->name) == 0) { 1953 /* It was a dir, but now it's gone. */ 1954 a->pst = NULL; 1955 } else { 1956 /* We tried, but couldn't get rid of it. */ 1957 archive_set_error(&a->archive, errno, 1958 "Could not unlink"); 1959 return(ARCHIVE_FAILED); 1960 } 1961 } 1962 1963 /* Try creating it first; if this fails, we'll try to recover. */ 1964 en = create_filesystem_object(a); 1965 1966 if ((en == ENOTDIR || en == ENOENT) 1967 && !(a->flags & ARCHIVE_EXTRACT_NO_AUTODIR)) { 1968 /* If the parent dir doesn't exist, try creating it. */ 1969 create_parent_dir(a, a->name); 1970 /* Now try to create the object again. */ 1971 en = create_filesystem_object(a); 1972 } 1973 1974 if ((en == ENOENT) && (archive_entry_hardlink(a->entry) != NULL)) { 1975 archive_set_error(&a->archive, en, 1976 "Hard-link target '%s' does not exist.", 1977 archive_entry_hardlink(a->entry)); 1978 return (ARCHIVE_FAILED); 1979 } 1980 1981 if ((en == EISDIR || en == EEXIST) 1982 && (a->flags & ARCHIVE_EXTRACT_NO_OVERWRITE)) { 1983 /* If we're not overwriting, we're done. */ 1984 archive_entry_unset_size(a->entry); 1985 return (ARCHIVE_OK); 1986 } 1987 1988 /* 1989 * Some platforms return EISDIR if you call 1990 * open(O_WRONLY | O_EXCL | O_CREAT) on a directory, some 1991 * return EEXIST. POSIX is ambiguous, requiring EISDIR 1992 * for open(O_WRONLY) on a dir and EEXIST for open(O_EXCL | O_CREAT) 1993 * on an existing item. 1994 */ 1995 if (en == EISDIR) { 1996 /* A dir is in the way of a non-dir, rmdir it. */ 1997 if (rmdir(a->name) != 0) { 1998 archive_set_error(&a->archive, errno, 1999 "Can't remove already-existing dir"); 2000 return (ARCHIVE_FAILED); 2001 } 2002 a->pst = NULL; 2003 /* Try again. */ 2004 en = create_filesystem_object(a); 2005 } else if (en == EEXIST) { 2006 /* 2007 * We know something is in the way, but we don't know what; 2008 * we need to find out before we go any further. 2009 */ 2010 int r = 0; 2011 /* 2012 * The SECURE_SYMLINKS logic has already removed a 2013 * symlink to a dir if the client wants that. So 2014 * follow the symlink if we're creating a dir. 2015 */ 2016 if (S_ISDIR(a->mode)) 2017 r = stat(a->name, &a->st); 2018 /* 2019 * If it's not a dir (or it's a broken symlink), 2020 * then don't follow it. 2021 */ 2022 if (r != 0 || !S_ISDIR(a->mode)) 2023 r = lstat(a->name, &a->st); 2024 if (r != 0) { 2025 archive_set_error(&a->archive, errno, 2026 "Can't stat existing object"); 2027 return (ARCHIVE_FAILED); 2028 } 2029 2030 /* 2031 * NO_OVERWRITE_NEWER doesn't apply to directories. 2032 */ 2033 if ((a->flags & ARCHIVE_EXTRACT_NO_OVERWRITE_NEWER) 2034 && !S_ISDIR(a->st.st_mode)) { 2035 if (!older(&(a->st), a->entry)) { 2036 archive_entry_unset_size(a->entry); 2037 return (ARCHIVE_OK); 2038 } 2039 } 2040 2041 /* If it's our archive, we're done. */ 2042 if (a->skip_file_set && 2043 a->st.st_dev == (dev_t)a->skip_file_dev && 2044 a->st.st_ino == (ino_t)a->skip_file_ino) { 2045 archive_set_error(&a->archive, 0, 2046 "Refusing to overwrite archive"); 2047 return (ARCHIVE_FAILED); 2048 } 2049 2050 if (!S_ISDIR(a->st.st_mode)) { 2051 /* A non-dir is in the way, unlink it. */ 2052 if (a->flags & ARCHIVE_EXTRACT_CLEAR_NOCHANGE_FFLAGS) 2053 (void)clear_nochange_fflags(a); 2054 if (unlink(a->name) != 0) { 2055 archive_set_error(&a->archive, errno, 2056 "Can't unlink already-existing object"); 2057 return (ARCHIVE_FAILED); 2058 } 2059 a->pst = NULL; 2060 /* Try again. */ 2061 en = create_filesystem_object(a); 2062 } else if (!S_ISDIR(a->mode)) { 2063 /* A dir is in the way of a non-dir, rmdir it. */ 2064 if (a->flags & ARCHIVE_EXTRACT_CLEAR_NOCHANGE_FFLAGS) 2065 (void)clear_nochange_fflags(a); 2066 if (rmdir(a->name) != 0) { 2067 archive_set_error(&a->archive, errno, 2068 "Can't replace existing directory with non-directory"); 2069 return (ARCHIVE_FAILED); 2070 } 2071 /* Try again. */ 2072 en = create_filesystem_object(a); 2073 } else { 2074 /* 2075 * There's a dir in the way of a dir. Don't 2076 * waste time with rmdir()/mkdir(), just fix 2077 * up the permissions on the existing dir. 2078 * Note that we don't change perms on existing 2079 * dirs unless _EXTRACT_PERM is specified. 2080 */ 2081 if ((a->mode != a->st.st_mode) 2082 && (a->todo & TODO_MODE_FORCE)) 2083 a->deferred |= (a->todo & TODO_MODE); 2084 /* Ownership doesn't need deferred fixup. */ 2085 en = 0; /* Forget the EEXIST. */ 2086 } 2087 } 2088 2089 if (en) { 2090 /* Everything failed; give up here. */ 2091 if ((&a->archive)->error == NULL) 2092 archive_set_error(&a->archive, en, "Can't create '%s'", 2093 a->name); 2094 return (ARCHIVE_FAILED); 2095 } 2096 2097 a->pst = NULL; /* Cached stat data no longer valid. */ 2098 return (ret); 2099} 2100 2101/* 2102 * Returns 0 if creation succeeds, or else returns errno value from 2103 * the failed system call. Note: This function should only ever perform 2104 * a single system call. 2105 */ 2106static int 2107create_filesystem_object(struct archive_write_disk *a) 2108{ 2109 /* Create the entry. */ 2110 const char *linkname; 2111 mode_t final_mode, mode; 2112 int r; 2113 /* these for check_symlinks_fsobj */ 2114 char *linkname_copy; /* non-const copy of linkname */ 2115 struct stat st; 2116 struct archive_string error_string; 2117 int error_number; 2118 2119 /* We identify hard/symlinks according to the link names. */ 2120 /* Since link(2) and symlink(2) don't handle modes, we're done here. */ 2121 linkname = archive_entry_hardlink(a->entry); 2122 if (linkname != NULL) { 2123#if !HAVE_LINK 2124 return (EPERM); 2125#else 2126 archive_string_init(&error_string); 2127 linkname_copy = strdup(linkname); 2128 if (linkname_copy == NULL) { 2129 return (EPERM); 2130 } 2131 /* 2132 * TODO: consider using the cleaned-up path as the link 2133 * target? 2134 */ 2135 r = cleanup_pathname_fsobj(linkname_copy, &error_number, 2136 &error_string, a->flags); 2137 if (r != ARCHIVE_OK) { 2138 archive_set_error(&a->archive, error_number, "%s", 2139 error_string.s); 2140 free(linkname_copy); 2141 archive_string_free(&error_string); 2142 /* 2143 * EPERM is more appropriate than error_number for our 2144 * callers 2145 */ 2146 return (EPERM); 2147 } 2148 r = check_symlinks_fsobj(linkname_copy, &error_number, 2149 &error_string, a->flags); 2150 if (r != ARCHIVE_OK) { 2151 archive_set_error(&a->archive, error_number, "%s", 2152 error_string.s); 2153 free(linkname_copy); 2154 archive_string_free(&error_string); 2155 /* 2156 * EPERM is more appropriate than error_number for our 2157 * callers 2158 */ 2159 return (EPERM); 2160 } 2161 free(linkname_copy); 2162 archive_string_free(&error_string); 2163 r = link(linkname, a->name) ? errno : 0; 2164 /* 2165 * New cpio and pax formats allow hardlink entries 2166 * to carry data, so we may have to open the file 2167 * for hardlink entries. 2168 * 2169 * If the hardlink was successfully created and 2170 * the archive doesn't have carry data for it, 2171 * consider it to be non-authoritative for meta data. 2172 * This is consistent with GNU tar and BSD pax. 2173 * If the hardlink does carry data, let the last 2174 * archive entry decide ownership. 2175 */ 2176 if (r == 0 && a->filesize <= 0) { 2177 a->todo = 0; 2178 a->deferred = 0; 2179 } else if (r == 0 && a->filesize > 0) { 2180#ifdef HAVE_LSTAT 2181 r = lstat(a->name, &st); 2182#else 2183 r = stat(a->name, &st); 2184#endif 2185 if (r != 0) 2186 r = errno; 2187 else if ((st.st_mode & AE_IFMT) == AE_IFREG) { 2188 a->fd = open(a->name, O_WRONLY | O_TRUNC | 2189 O_BINARY | O_CLOEXEC | O_NOFOLLOW); 2190 __archive_ensure_cloexec_flag(a->fd); 2191 if (a->fd < 0) 2192 r = errno; 2193 } 2194 } 2195 return (r); 2196#endif 2197 } 2198 linkname = archive_entry_symlink(a->entry); 2199 if (linkname != NULL) { 2200#if HAVE_SYMLINK 2201 return symlink(linkname, a->name) ? errno : 0; 2202#else 2203 return (EPERM); 2204#endif 2205 } 2206 2207 /* 2208 * The remaining system calls all set permissions, so let's 2209 * try to take advantage of that to avoid an extra chmod() 2210 * call. (Recall that umask is set to zero right now!) 2211 */ 2212 2213 /* Mode we want for the final restored object (w/o file type bits). */ 2214 final_mode = a->mode & 07777; 2215 /* 2216 * The mode that will actually be restored in this step. Note 2217 * that SUID, SGID, etc, require additional work to ensure 2218 * security, so we never restore them at this point. 2219 */ 2220 mode = final_mode & 0777 & ~a->user_umask; 2221 2222 switch (a->mode & AE_IFMT) { 2223 default: 2224 /* POSIX requires that we fall through here. */ 2225 /* FALLTHROUGH */ 2226 case AE_IFREG: 2227 a->fd = open(a->name, 2228 O_WRONLY | O_CREAT | O_EXCL | O_BINARY | O_CLOEXEC, mode); 2229 __archive_ensure_cloexec_flag(a->fd); 2230 r = (a->fd < 0); 2231 break; 2232 case AE_IFCHR: 2233#ifdef HAVE_MKNOD 2234 /* Note: we use AE_IFCHR for the case label, and 2235 * S_IFCHR for the mknod() call. This is correct. */ 2236 r = mknod(a->name, mode | S_IFCHR, 2237 archive_entry_rdev(a->entry)); 2238 break; 2239#else 2240 /* TODO: Find a better way to warn about our inability 2241 * to restore a char device node. */ 2242 return (EINVAL); 2243#endif /* HAVE_MKNOD */ 2244 case AE_IFBLK: 2245#ifdef HAVE_MKNOD 2246 r = mknod(a->name, mode | S_IFBLK, 2247 archive_entry_rdev(a->entry)); 2248 break; 2249#else 2250 /* TODO: Find a better way to warn about our inability 2251 * to restore a block device node. */ 2252 return (EINVAL); 2253#endif /* HAVE_MKNOD */ 2254 case AE_IFDIR: 2255 mode = (mode | MINIMUM_DIR_MODE) & MAXIMUM_DIR_MODE; 2256 r = mkdir(a->name, mode); 2257 if (r == 0) { 2258 /* Defer setting dir times. */ 2259 a->deferred |= (a->todo & TODO_TIMES); 2260 a->todo &= ~TODO_TIMES; 2261 /* Never use an immediate chmod(). */ 2262 /* We can't avoid the chmod() entirely if EXTRACT_PERM 2263 * because of SysV SGID inheritance. */ 2264 if ((mode != final_mode) 2265 || (a->flags & ARCHIVE_EXTRACT_PERM)) 2266 a->deferred |= (a->todo & TODO_MODE); 2267 a->todo &= ~TODO_MODE; 2268 } 2269 break; 2270 case AE_IFIFO: 2271#ifdef HAVE_MKFIFO 2272 r = mkfifo(a->name, mode); 2273 break; 2274#else 2275 /* TODO: Find a better way to warn about our inability 2276 * to restore a fifo. */ 2277 return (EINVAL); 2278#endif /* HAVE_MKFIFO */ 2279 } 2280 2281 /* All the system calls above set errno on failure. */ 2282 if (r) 2283 return (errno); 2284 2285 /* If we managed to set the final mode, we've avoided a chmod(). */ 2286 if (mode == final_mode) 2287 a->todo &= ~TODO_MODE; 2288 return (0); 2289} 2290 2291/* 2292 * Cleanup function for archive_extract. Mostly, this involves processing 2293 * the fixup list, which is used to address a number of problems: 2294 * * Dir permissions might prevent us from restoring a file in that 2295 * dir, so we restore the dir with minimum 0700 permissions first, 2296 * then correct the mode at the end. 2297 * * Similarly, the act of restoring a file touches the directory 2298 * and changes the timestamp on the dir, so we have to touch-up dir 2299 * timestamps at the end as well. 2300 * * Some file flags can interfere with the restore by, for example, 2301 * preventing the creation of hardlinks to those files. 2302 * * Mac OS extended metadata includes ACLs, so must be deferred on dirs. 2303 * 2304 * Note that tar/cpio do not require that archives be in a particular 2305 * order; there is no way to know when the last file has been restored 2306 * within a directory, so there's no way to optimize the memory usage 2307 * here by fixing up the directory any earlier than the 2308 * end-of-archive. 2309 * 2310 * XXX TODO: Directory ACLs should be restored here, for the same 2311 * reason we set directory perms here. XXX 2312 */ 2313static int 2314_archive_write_disk_close(struct archive *_a) 2315{ 2316 struct archive_write_disk *a = (struct archive_write_disk *)_a; 2317 struct fixup_entry *next, *p; 2318 int ret; 2319 2320 archive_check_magic(&a->archive, ARCHIVE_WRITE_DISK_MAGIC, 2321 ARCHIVE_STATE_HEADER | ARCHIVE_STATE_DATA, 2322 "archive_write_disk_close"); 2323 ret = _archive_write_disk_finish_entry(&a->archive); 2324 2325 /* Sort dir list so directories are fixed up in depth-first order. */ 2326 p = sort_dir_list(a->fixup_list); 2327 2328 while (p != NULL) { 2329 a->pst = NULL; /* Mark stat cache as out-of-date. */ 2330 if (p->fixup & TODO_TIMES) { 2331 set_times(a, -1, p->mode, p->name, 2332 p->atime, p->atime_nanos, 2333 p->birthtime, p->birthtime_nanos, 2334 p->mtime, p->mtime_nanos, 2335 p->ctime, p->ctime_nanos); 2336 } 2337 if (p->fixup & TODO_MODE_BASE) 2338 chmod(p->name, p->mode); 2339 if (p->fixup & TODO_ACLS) 2340 archive_write_disk_set_acls(&a->archive, -1, p->name, 2341 &p->acl, p->mode); 2342 if (p->fixup & TODO_FFLAGS) 2343 set_fflags_platform(a, -1, p->name, 2344 p->mode, p->fflags_set, 0); 2345 if (p->fixup & TODO_MAC_METADATA) 2346 set_mac_metadata(a, p->name, p->mac_metadata, 2347 p->mac_metadata_size); 2348 next = p->next; 2349 archive_acl_clear(&p->acl); 2350 free(p->mac_metadata); 2351 free(p->name); 2352 free(p); 2353 p = next; 2354 } 2355 a->fixup_list = NULL; 2356 return (ret); 2357} 2358 2359static int 2360_archive_write_disk_free(struct archive *_a) 2361{ 2362 struct archive_write_disk *a; 2363 int ret; 2364 if (_a == NULL) 2365 return (ARCHIVE_OK); 2366 archive_check_magic(_a, ARCHIVE_WRITE_DISK_MAGIC, 2367 ARCHIVE_STATE_ANY | ARCHIVE_STATE_FATAL, "archive_write_disk_free"); 2368 a = (struct archive_write_disk *)_a; 2369 ret = _archive_write_disk_close(&a->archive); 2370 archive_write_disk_set_group_lookup(&a->archive, NULL, NULL, NULL); 2371 archive_write_disk_set_user_lookup(&a->archive, NULL, NULL, NULL); 2372 if (a->entry) 2373 archive_entry_free(a->entry); 2374 archive_string_free(&a->_name_data); 2375 archive_string_free(&a->archive.error_string); 2376 archive_string_free(&a->path_safe); 2377 a->archive.magic = 0; 2378 __archive_clean(&a->archive); 2379 free(a->decmpfs_header_p); 2380 free(a->resource_fork); 2381 free(a->compressed_buffer); 2382 free(a->uncompressed_buffer); 2383#if defined(__APPLE__) && defined(UF_COMPRESSED) && defined(HAVE_SYS_XATTR_H)\ 2384 && defined(HAVE_ZLIB_H) 2385 if (a->stream_valid) { 2386 switch (deflateEnd(&a->stream)) { 2387 case Z_OK: 2388 break; 2389 default: 2390 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 2391 "Failed to clean up compressor"); 2392 ret = ARCHIVE_FATAL; 2393 break; 2394 } 2395 } 2396#endif 2397 free(a); 2398 return (ret); 2399} 2400 2401/* 2402 * Simple O(n log n) merge sort to order the fixup list. In 2403 * particular, we want to restore dir timestamps depth-first. 2404 */ 2405static struct fixup_entry * 2406sort_dir_list(struct fixup_entry *p) 2407{ 2408 struct fixup_entry *a, *b, *t; 2409 2410 if (p == NULL) 2411 return (NULL); 2412 /* A one-item list is already sorted. */ 2413 if (p->next == NULL) 2414 return (p); 2415 2416 /* Step 1: split the list. */ 2417 t = p; 2418 a = p->next->next; 2419 while (a != NULL) { 2420 /* Step a twice, t once. */ 2421 a = a->next; 2422 if (a != NULL) 2423 a = a->next; 2424 t = t->next; 2425 } 2426 /* Now, t is at the mid-point, so break the list here. */ 2427 b = t->next; 2428 t->next = NULL; 2429 a = p; 2430 2431 /* Step 2: Recursively sort the two sub-lists. */ 2432 a = sort_dir_list(a); 2433 b = sort_dir_list(b); 2434 2435 /* Step 3: Merge the returned lists. */ 2436 /* Pick the first element for the merged list. */ 2437 if (strcmp(a->name, b->name) > 0) { 2438 t = p = a; 2439 a = a->next; 2440 } else { 2441 t = p = b; 2442 b = b->next; 2443 } 2444 2445 /* Always put the later element on the list first. */ 2446 while (a != NULL && b != NULL) { 2447 if (strcmp(a->name, b->name) > 0) { 2448 t->next = a; 2449 a = a->next; 2450 } else { 2451 t->next = b; 2452 b = b->next; 2453 } 2454 t = t->next; 2455 } 2456 2457 /* Only one list is non-empty, so just splice it on. */ 2458 if (a != NULL) 2459 t->next = a; 2460 if (b != NULL) 2461 t->next = b; 2462 2463 return (p); 2464} 2465 2466/* 2467 * Returns a new, initialized fixup entry. 2468 * 2469 * TODO: Reduce the memory requirements for this list by using a tree 2470 * structure rather than a simple list of names. 2471 */ 2472static struct fixup_entry * 2473new_fixup(struct archive_write_disk *a, const char *pathname) 2474{ 2475 struct fixup_entry *fe; 2476 2477 fe = (struct fixup_entry *)calloc(1, sizeof(struct fixup_entry)); 2478 if (fe == NULL) { 2479 archive_set_error(&a->archive, ENOMEM, 2480 "Can't allocate memory for a fixup"); 2481 return (NULL); 2482 } 2483 fe->next = a->fixup_list; 2484 a->fixup_list = fe; 2485 fe->fixup = 0; 2486 fe->name = strdup(pathname); 2487 return (fe); 2488} 2489 2490/* 2491 * Returns a fixup structure for the current entry. 2492 */ 2493static struct fixup_entry * 2494current_fixup(struct archive_write_disk *a, const char *pathname) 2495{ 2496 if (a->current_fixup == NULL) 2497 a->current_fixup = new_fixup(a, pathname); 2498 return (a->current_fixup); 2499} 2500 2501/* Error helper for new *_fsobj functions */ 2502static void 2503fsobj_error(int *a_eno, struct archive_string *a_estr, 2504 int err, const char *errstr, const char *path) 2505{ 2506 if (a_eno) 2507 *a_eno = err; 2508 if (a_estr) 2509 archive_string_sprintf(a_estr, "%s%s", errstr, path); 2510} 2511 2512/* 2513 * TODO: Someday, integrate this with the deep dir support; they both 2514 * scan the path and both can be optimized by comparing against other 2515 * recent paths. 2516 */ 2517/* TODO: Extend this to support symlinks on Windows Vista and later. */ 2518 2519/* 2520 * Checks the given path to see if any elements along it are symlinks. Returns 2521 * ARCHIVE_OK if there are none, otherwise puts an error in errmsg. 2522 */ 2523static int 2524check_symlinks_fsobj(char *path, int *a_eno, struct archive_string *a_estr, 2525 int flags) 2526{ 2527#if !defined(HAVE_LSTAT) 2528 /* Platform doesn't have lstat, so we can't look for symlinks. */ 2529 (void)path; /* UNUSED */ 2530 (void)error_number; /* UNUSED */ 2531 (void)error_string; /* UNUSED */ 2532 (void)flags; /* UNUSED */ 2533 return (ARCHIVE_OK); 2534#else 2535 int res = ARCHIVE_OK; 2536 char *tail; 2537 char *head; 2538 int last; 2539 char c; 2540 int r; 2541 struct stat st; 2542 int restore_pwd; 2543 2544 /* Nothing to do here if name is empty */ 2545 if(path[0] == '\0') 2546 return (ARCHIVE_OK); 2547 2548 /* 2549 * Guard against symlink tricks. Reject any archive entry whose 2550 * destination would be altered by a symlink. 2551 * 2552 * Walk the filename in chunks separated by '/'. For each segment: 2553 * - if it doesn't exist, continue 2554 * - if it's symlink, abort or remove it 2555 * - if it's a directory and it's not the last chunk, cd into it 2556 * As we go: 2557 * head points to the current (relative) path 2558 * tail points to the temporary \0 terminating the segment we're 2559 * currently examining 2560 * c holds what used to be in *tail 2561 * last is 1 if this is the last tail 2562 */ 2563 restore_pwd = open(".", O_RDONLY | O_BINARY | O_CLOEXEC); 2564 __archive_ensure_cloexec_flag(restore_pwd); 2565 if (restore_pwd < 0) 2566 return (ARCHIVE_FATAL); 2567 head = path; 2568 tail = path; 2569 last = 0; 2570 /* TODO: reintroduce a safe cache here? */ 2571 /* Skip the root directory if the path is absolute. */ 2572 if(tail == path && tail[0] == '/') 2573 ++tail; 2574 /* Keep going until we've checked the entire name. 2575 * head, tail, path all alias the same string, which is 2576 * temporarily zeroed at tail, so be careful restoring the 2577 * stashed (c=tail[0]) for error messages. 2578 * Exiting the loop with break is okay; continue is not. 2579 */ 2580 while (!last) { 2581 /* 2582 * Skip the separator we just consumed, plus any adjacent ones 2583 */ 2584 while (*tail == '/') 2585 ++tail; 2586 /* Skip the next path element. */ 2587 while (*tail != '\0' && *tail != '/') 2588 ++tail; 2589 /* is this the last path component? */ 2590 last = (tail[0] == '\0') || (tail[0] == '/' && tail[1] == '\0'); 2591 /* temporarily truncate the string here */ 2592 c = tail[0]; 2593 tail[0] = '\0'; 2594 /* Check that we haven't hit a symlink. */ 2595 r = lstat(head, &st); 2596 if (r != 0) { 2597 tail[0] = c; 2598 /* We've hit a dir that doesn't exist; stop now. */ 2599 if (errno == ENOENT) { 2600 break; 2601 } else { 2602 /* 2603 * Treat any other error as fatal - best to be 2604 * paranoid here. 2605 * Note: This effectively disables deep 2606 * directory support when security checks are 2607 * enabled. Otherwise, very long pathnames that 2608 * trigger an error here could evade the 2609 * sandbox. 2610 * TODO: We could do better, but it would 2611 * probably require merging the symlink checks 2612 * with the deep-directory editing. 2613 */ 2614 fsobj_error(a_eno, a_estr, errno, 2615 "Could not stat ", path); 2616 res = ARCHIVE_FAILED; 2617 break; 2618 } 2619 } else if (S_ISDIR(st.st_mode)) { 2620 if (!last) { 2621 if (chdir(head) != 0) { 2622 tail[0] = c; 2623 fsobj_error(a_eno, a_estr, errno, 2624 "Could not chdir ", path); 2625 res = (ARCHIVE_FATAL); 2626 break; 2627 } 2628 /* Our view is now from inside this dir: */ 2629 head = tail + 1; 2630 } 2631 } else if (S_ISLNK(st.st_mode)) { 2632 if (last) { 2633 /* 2634 * Last element is symlink; remove it 2635 * so we can overwrite it with the 2636 * item being extracted. 2637 */ 2638 if (unlink(head)) { 2639 tail[0] = c; 2640 fsobj_error(a_eno, a_estr, errno, 2641 "Could not remove symlink ", 2642 path); 2643 res = ARCHIVE_FAILED; 2644 break; 2645 } 2646 /* 2647 * Even if we did remove it, a warning 2648 * is in order. The warning is silly, 2649 * though, if we're just replacing one 2650 * symlink with another symlink. 2651 */ 2652 tail[0] = c; 2653 /* 2654 * FIXME: not sure how important this is to 2655 * restore 2656 */ 2657 /* 2658 if (!S_ISLNK(path)) { 2659 fsobj_error(a_eno, a_estr, 0, 2660 "Removing symlink ", path); 2661 } 2662 */ 2663 /* Symlink gone. No more problem! */ 2664 res = ARCHIVE_OK; 2665 break; 2666 } else if (flags & ARCHIVE_EXTRACT_UNLINK) { 2667 /* User asked us to remove problems. */ 2668 if (unlink(head) != 0) { 2669 tail[0] = c; 2670 fsobj_error(a_eno, a_estr, 0, 2671 "Cannot remove intervening " 2672 "symlink ", path); 2673 res = ARCHIVE_FAILED; 2674 break; 2675 } 2676 tail[0] = c; 2677 } else if ((flags & 2678 ARCHIVE_EXTRACT_SECURE_SYMLINKS) == 0) { 2679 /* 2680 * We are not the last element and we want to 2681 * follow symlinks if they are a directory. 2682 * 2683 * This is needed to extract hardlinks over 2684 * symlinks. 2685 */ 2686 r = stat(head, &st); 2687 if (r != 0) { 2688 tail[0] = c; 2689 if (errno == ENOENT) { 2690 break; 2691 } else { 2692 fsobj_error(a_eno, a_estr, 2693 errno, 2694 "Could not stat ", path); 2695 res = (ARCHIVE_FAILED); 2696 break; 2697 } 2698 } else if (S_ISDIR(st.st_mode)) { 2699 if (chdir(head) != 0) { 2700 tail[0] = c; 2701 fsobj_error(a_eno, a_estr, 2702 errno, 2703 "Could not chdir ", path); 2704 res = (ARCHIVE_FATAL); 2705 break; 2706 } 2707 /* 2708 * Our view is now from inside 2709 * this dir: 2710 */ 2711 head = tail + 1; 2712 } else { 2713 tail[0] = c; 2714 fsobj_error(a_eno, a_estr, 0, 2715 "Cannot extract through " 2716 "symlink ", path); 2717 res = ARCHIVE_FAILED; 2718 break; 2719 } 2720 } else { 2721 tail[0] = c; 2722 fsobj_error(a_eno, a_estr, 0, 2723 "Cannot extract through symlink ", path); 2724 res = ARCHIVE_FAILED; 2725 break; 2726 } 2727 } 2728 /* be sure to always maintain this */ 2729 tail[0] = c; 2730 if (tail[0] != '\0') 2731 tail++; /* Advance to the next segment. */ 2732 } 2733 /* Catches loop exits via break */ 2734 tail[0] = c; 2735#ifdef HAVE_FCHDIR 2736 /* If we changed directory above, restore it here. */ 2737 if (restore_pwd >= 0) { 2738 r = fchdir(restore_pwd); 2739 if (r != 0) { 2740 fsobj_error(a_eno, a_estr, errno, 2741 "chdir() failure", ""); 2742 } 2743 close(restore_pwd); 2744 restore_pwd = -1; 2745 if (r != 0) { 2746 res = (ARCHIVE_FATAL); 2747 } 2748 } 2749#endif 2750 /* TODO: reintroduce a safe cache here? */ 2751 return res; 2752#endif 2753} 2754 2755/* 2756 * Check a->name for symlinks, returning ARCHIVE_OK if its clean, otherwise 2757 * calls archive_set_error and returns ARCHIVE_{FATAL,FAILED} 2758 */ 2759static int 2760check_symlinks(struct archive_write_disk *a) 2761{ 2762 struct archive_string error_string; 2763 int error_number; 2764 int rc; 2765 archive_string_init(&error_string); 2766 rc = check_symlinks_fsobj(a->name, &error_number, &error_string, 2767 a->flags); 2768 if (rc != ARCHIVE_OK) { 2769 archive_set_error(&a->archive, error_number, "%s", 2770 error_string.s); 2771 } 2772 archive_string_free(&error_string); 2773 a->pst = NULL; /* to be safe */ 2774 return rc; 2775} 2776 2777 2778#if defined(__CYGWIN__) 2779/* 2780 * 1. Convert a path separator from '\' to '/' . 2781 * We shouldn't check multibyte character directly because some 2782 * character-set have been using the '\' character for a part of 2783 * its multibyte character code. 2784 * 2. Replace unusable characters in Windows with underscore('_'). 2785 * See also : http://msdn.microsoft.com/en-us/library/aa365247.aspx 2786 */ 2787static void 2788cleanup_pathname_win(char *path) 2789{ 2790 wchar_t wc; 2791 char *p; 2792 size_t alen, l; 2793 int mb, complete, utf8; 2794 2795 alen = 0; 2796 mb = 0; 2797 complete = 1; 2798 utf8 = (strcmp(nl_langinfo(CODESET), "UTF-8") == 0)? 1: 0; 2799 for (p = path; *p != '\0'; p++) { 2800 ++alen; 2801 if (*p == '\\') { 2802 /* If previous byte is smaller than 128, 2803 * this is not second byte of multibyte characters, 2804 * so we can replace '\' with '/'. */ 2805 if (utf8 || !mb) 2806 *p = '/'; 2807 else 2808 complete = 0;/* uncompleted. */ 2809 } else if (*(unsigned char *)p > 127) 2810 mb = 1; 2811 else 2812 mb = 0; 2813 /* Rewrite the path name if its next character is unusable. */ 2814 if (*p == ':' || *p == '*' || *p == '?' || *p == '"' || 2815 *p == '<' || *p == '>' || *p == '|') 2816 *p = '_'; 2817 } 2818 if (complete) 2819 return; 2820 2821 /* 2822 * Convert path separator in wide-character. 2823 */ 2824 p = path; 2825 while (*p != '\0' && alen) { 2826 l = mbtowc(&wc, p, alen); 2827 if (l == (size_t)-1) { 2828 while (*p != '\0') { 2829 if (*p == '\\') 2830 *p = '/'; 2831 ++p; 2832 } 2833 break; 2834 } 2835 if (l == 1 && wc == L'\\') 2836 *p = '/'; 2837 p += l; 2838 alen -= l; 2839 } 2840} 2841#endif 2842 2843/* 2844 * Canonicalize the pathname. In particular, this strips duplicate 2845 * '/' characters, '.' elements, and trailing '/'. It also raises an 2846 * error for an empty path, a trailing '..', (if _SECURE_NODOTDOT is 2847 * set) any '..' in the path or (if ARCHIVE_EXTRACT_SECURE_NOABSOLUTEPATHS 2848 * is set) if the path is absolute. 2849 */ 2850static int 2851cleanup_pathname_fsobj(char *path, int *a_eno, struct archive_string *a_estr, 2852 int flags) 2853{ 2854 char *dest, *src; 2855 char separator = '\0'; 2856 2857 dest = src = path; 2858 if (*src == '\0') { 2859 fsobj_error(a_eno, a_estr, ARCHIVE_ERRNO_MISC, 2860 "Invalid empty ", "pathname"); 2861 return (ARCHIVE_FAILED); 2862 } 2863 2864#if defined(__CYGWIN__) 2865 cleanup_pathname_win(path); 2866#endif 2867 /* Skip leading '/'. */ 2868 if (*src == '/') { 2869 if (flags & ARCHIVE_EXTRACT_SECURE_NOABSOLUTEPATHS) { 2870 fsobj_error(a_eno, a_estr, ARCHIVE_ERRNO_MISC, 2871 "Path is ", "absolute"); 2872 return (ARCHIVE_FAILED); 2873 } 2874 2875 separator = *src++; 2876 } 2877 2878 /* Scan the pathname one element at a time. */ 2879 for (;;) { 2880 /* src points to first char after '/' */ 2881 if (src[0] == '\0') { 2882 break; 2883 } else if (src[0] == '/') { 2884 /* Found '//', ignore second one. */ 2885 src++; 2886 continue; 2887 } else if (src[0] == '.') { 2888 if (src[1] == '\0') { 2889 /* Ignore trailing '.' */ 2890 break; 2891 } else if (src[1] == '/') { 2892 /* Skip './'. */ 2893 src += 2; 2894 continue; 2895 } else if (src[1] == '.') { 2896 if (src[2] == '/' || src[2] == '\0') { 2897 /* Conditionally warn about '..' */ 2898 if (flags 2899 & ARCHIVE_EXTRACT_SECURE_NODOTDOT) { 2900 fsobj_error(a_eno, a_estr, 2901 ARCHIVE_ERRNO_MISC, 2902 "Path contains ", "'..'"); 2903 return (ARCHIVE_FAILED); 2904 } 2905 } 2906 /* 2907 * Note: Under no circumstances do we 2908 * remove '..' elements. In 2909 * particular, restoring 2910 * '/foo/../bar/' should create the 2911 * 'foo' dir as a side-effect. 2912 */ 2913 } 2914 } 2915 2916 /* Copy current element, including leading '/'. */ 2917 if (separator) 2918 *dest++ = '/'; 2919 while (*src != '\0' && *src != '/') { 2920 *dest++ = *src++; 2921 } 2922 2923 if (*src == '\0') 2924 break; 2925 2926 /* Skip '/' separator. */ 2927 separator = *src++; 2928 } 2929 /* 2930 * We've just copied zero or more path elements, not including the 2931 * final '/'. 2932 */ 2933 if (dest == path) { 2934 /* 2935 * Nothing got copied. The path must have been something 2936 * like '.' or '/' or './' or '/././././/./'. 2937 */ 2938 if (separator) 2939 *dest++ = '/'; 2940 else 2941 *dest++ = '.'; 2942 } 2943 /* Terminate the result. */ 2944 *dest = '\0'; 2945 return (ARCHIVE_OK); 2946} 2947 2948static int 2949cleanup_pathname(struct archive_write_disk *a) 2950{ 2951 struct archive_string error_string; 2952 int error_number; 2953 int rc; 2954 archive_string_init(&error_string); 2955 rc = cleanup_pathname_fsobj(a->name, &error_number, &error_string, 2956 a->flags); 2957 if (rc != ARCHIVE_OK) { 2958 archive_set_error(&a->archive, error_number, "%s", 2959 error_string.s); 2960 } 2961 archive_string_free(&error_string); 2962 return rc; 2963} 2964 2965/* 2966 * Create the parent directory of the specified path, assuming path 2967 * is already in mutable storage. 2968 */ 2969static int 2970create_parent_dir(struct archive_write_disk *a, char *path) 2971{ 2972 char *slash; 2973 int r; 2974 2975 /* Remove tail element to obtain parent name. */ 2976 slash = strrchr(path, '/'); 2977 if (slash == NULL) 2978 return (ARCHIVE_OK); 2979 *slash = '\0'; 2980 r = create_dir(a, path); 2981 *slash = '/'; 2982 return (r); 2983} 2984 2985/* 2986 * Create the specified dir, recursing to create parents as necessary. 2987 * 2988 * Returns ARCHIVE_OK if the path exists when we're done here. 2989 * Otherwise, returns ARCHIVE_FAILED. 2990 * Assumes path is in mutable storage; path is unchanged on exit. 2991 */ 2992static int 2993create_dir(struct archive_write_disk *a, char *path) 2994{ 2995 struct stat st; 2996 struct fixup_entry *le; 2997 char *slash, *base; 2998 mode_t mode_final, mode; 2999 int r; 3000 3001 /* Check for special names and just skip them. */ 3002 slash = strrchr(path, '/'); 3003 if (slash == NULL) 3004 base = path; 3005 else 3006 base = slash + 1; 3007 3008 if (base[0] == '\0' || 3009 (base[0] == '.' && base[1] == '\0') || 3010 (base[0] == '.' && base[1] == '.' && base[2] == '\0')) { 3011 /* Don't bother trying to create null path, '.', or '..'. */ 3012 if (slash != NULL) { 3013 *slash = '\0'; 3014 r = create_dir(a, path); 3015 *slash = '/'; 3016 return (r); 3017 } 3018 return (ARCHIVE_OK); 3019 } 3020 3021 /* 3022 * Yes, this should be stat() and not lstat(). Using lstat() 3023 * here loses the ability to extract through symlinks. Also note 3024 * that this should not use the a->st cache. 3025 */ 3026 if (stat(path, &st) == 0) { 3027 if (S_ISDIR(st.st_mode)) 3028 return (ARCHIVE_OK); 3029 if ((a->flags & ARCHIVE_EXTRACT_NO_OVERWRITE)) { 3030 archive_set_error(&a->archive, EEXIST, 3031 "Can't create directory '%s'", path); 3032 return (ARCHIVE_FAILED); 3033 } 3034 if (unlink(path) != 0) { 3035 archive_set_error(&a->archive, errno, 3036 "Can't create directory '%s': " 3037 "Conflicting file cannot be removed", 3038 path); 3039 return (ARCHIVE_FAILED); 3040 } 3041 } else if (errno != ENOENT && errno != ENOTDIR) { 3042 /* Stat failed? */ 3043 archive_set_error(&a->archive, errno, 3044 "Can't test directory '%s'", path); 3045 return (ARCHIVE_FAILED); 3046 } else if (slash != NULL) { 3047 *slash = '\0'; 3048 r = create_dir(a, path); 3049 *slash = '/'; 3050 if (r != ARCHIVE_OK) 3051 return (r); 3052 } 3053 3054 /* 3055 * Mode we want for the final restored directory. Per POSIX, 3056 * implicitly-created dirs must be created obeying the umask. 3057 * There's no mention whether this is different for privileged 3058 * restores (which the rest of this code handles by pretending 3059 * umask=0). I've chosen here to always obey the user's umask for 3060 * implicit dirs, even if _EXTRACT_PERM was specified. 3061 */ 3062 mode_final = DEFAULT_DIR_MODE & ~a->user_umask; 3063 /* Mode we want on disk during the restore process. */ 3064 mode = mode_final; 3065 mode |= MINIMUM_DIR_MODE; 3066 mode &= MAXIMUM_DIR_MODE; 3067 if (mkdir(path, mode) == 0) { 3068 if (mode != mode_final) { 3069 le = new_fixup(a, path); 3070 if (le == NULL) 3071 return (ARCHIVE_FATAL); 3072 le->fixup |=TODO_MODE_BASE; 3073 le->mode = mode_final; 3074 } 3075 return (ARCHIVE_OK); 3076 } 3077 3078 /* 3079 * Without the following check, a/b/../b/c/d fails at the 3080 * second visit to 'b', so 'd' can't be created. Note that we 3081 * don't add it to the fixup list here, as it's already been 3082 * added. 3083 */ 3084 if (stat(path, &st) == 0 && S_ISDIR(st.st_mode)) 3085 return (ARCHIVE_OK); 3086 3087 archive_set_error(&a->archive, errno, "Failed to create dir '%s'", 3088 path); 3089 return (ARCHIVE_FAILED); 3090} 3091 3092/* 3093 * Note: Although we can skip setting the user id if the desired user 3094 * id matches the current user, we cannot skip setting the group, as 3095 * many systems set the gid based on the containing directory. So 3096 * we have to perform a chown syscall if we want to set the SGID 3097 * bit. (The alternative is to stat() and then possibly chown(); it's 3098 * more efficient to skip the stat() and just always chown().) Note 3099 * that a successful chown() here clears the TODO_SGID_CHECK bit, which 3100 * allows set_mode to skip the stat() check for the GID. 3101 */ 3102static int 3103set_ownership(struct archive_write_disk *a) 3104{ 3105#ifndef __CYGWIN__ 3106/* unfortunately, on win32 there is no 'root' user with uid 0, 3107 so we just have to try the chown and see if it works */ 3108 3109 /* If we know we can't change it, don't bother trying. */ 3110 if (a->user_uid != 0 && a->user_uid != a->uid) { 3111 archive_set_error(&a->archive, errno, 3112 "Can't set UID=%jd", (intmax_t)a->uid); 3113 return (ARCHIVE_WARN); 3114 } 3115#endif 3116 3117#ifdef HAVE_FCHOWN 3118 /* If we have an fd, we can avoid a race. */ 3119 if (a->fd >= 0 && fchown(a->fd, a->uid, a->gid) == 0) { 3120 /* We've set owner and know uid/gid are correct. */ 3121 a->todo &= ~(TODO_OWNER | TODO_SGID_CHECK | TODO_SUID_CHECK); 3122 return (ARCHIVE_OK); 3123 } 3124#endif 3125 3126 /* We prefer lchown() but will use chown() if that's all we have. */ 3127 /* Of course, if we have neither, this will always fail. */ 3128#ifdef HAVE_LCHOWN 3129 if (lchown(a->name, a->uid, a->gid) == 0) { 3130 /* We've set owner and know uid/gid are correct. */ 3131 a->todo &= ~(TODO_OWNER | TODO_SGID_CHECK | TODO_SUID_CHECK); 3132 return (ARCHIVE_OK); 3133 } 3134#elif HAVE_CHOWN 3135 if (!S_ISLNK(a->mode) && chown(a->name, a->uid, a->gid) == 0) { 3136 /* We've set owner and know uid/gid are correct. */ 3137 a->todo &= ~(TODO_OWNER | TODO_SGID_CHECK | TODO_SUID_CHECK); 3138 return (ARCHIVE_OK); 3139 } 3140#endif 3141 3142 archive_set_error(&a->archive, errno, 3143 "Can't set user=%jd/group=%jd for %s", 3144 (intmax_t)a->uid, (intmax_t)a->gid, a->name); 3145 return (ARCHIVE_WARN); 3146} 3147 3148/* 3149 * Note: Returns 0 on success, non-zero on failure. 3150 */ 3151static int 3152set_time(int fd, int mode, const char *name, 3153 time_t atime, long atime_nsec, 3154 time_t mtime, long mtime_nsec) 3155{ 3156 /* Select the best implementation for this platform. */ 3157#if defined(HAVE_UTIMENSAT) && defined(HAVE_FUTIMENS) 3158 /* 3159 * utimensat() and futimens() are defined in 3160 * POSIX.1-2008. They support ns resolution and setting times 3161 * on fds and symlinks. 3162 */ 3163 struct timespec ts[2]; 3164 (void)mode; /* UNUSED */ 3165 ts[0].tv_sec = atime; 3166 ts[0].tv_nsec = atime_nsec; 3167 ts[1].tv_sec = mtime; 3168 ts[1].tv_nsec = mtime_nsec; 3169 if (fd >= 0) 3170 return futimens(fd, ts); 3171 return utimensat(AT_FDCWD, name, ts, AT_SYMLINK_NOFOLLOW); 3172 3173#elif HAVE_UTIMES 3174 /* 3175 * The utimes()-family functions support ��s-resolution and 3176 * setting times fds and symlinks. utimes() is documented as 3177 * LEGACY by POSIX, futimes() and lutimes() are not described 3178 * in POSIX. 3179 */ 3180 struct timeval times[2]; 3181 3182 times[0].tv_sec = atime; 3183 times[0].tv_usec = atime_nsec / 1000; 3184 times[1].tv_sec = mtime; 3185 times[1].tv_usec = mtime_nsec / 1000; 3186 3187#ifdef HAVE_FUTIMES 3188 if (fd >= 0) 3189 return (futimes(fd, times)); 3190#else 3191 (void)fd; /* UNUSED */ 3192#endif 3193#ifdef HAVE_LUTIMES 3194 (void)mode; /* UNUSED */ 3195 return (lutimes(name, times)); 3196#else 3197 if (S_ISLNK(mode)) 3198 return (0); 3199 return (utimes(name, times)); 3200#endif 3201 3202#elif defined(HAVE_UTIME) 3203 /* 3204 * utime() is POSIX-standard but only supports 1s resolution and 3205 * does not support fds or symlinks. 3206 */ 3207 struct utimbuf times; 3208 (void)fd; /* UNUSED */ 3209 (void)name; /* UNUSED */ 3210 (void)atime_nsec; /* UNUSED */ 3211 (void)mtime_nsec; /* UNUSED */ 3212 times.actime = atime; 3213 times.modtime = mtime; 3214 if (S_ISLNK(mode)) 3215 return (ARCHIVE_OK); 3216 return (utime(name, ×)); 3217 3218#else 3219 /* 3220 * We don't know how to set the time on this platform. 3221 */ 3222 (void)fd; /* UNUSED */ 3223 (void)mode; /* UNUSED */ 3224 (void)name; /* UNUSED */ 3225 (void)atime_nsec; /* UNUSED */ 3226 (void)mtime_nsec; /* UNUSED */ 3227 return (ARCHIVE_WARN); 3228#endif 3229} 3230 3231#ifdef F_SETTIMES 3232static int 3233set_time_tru64(int fd, int mode, const char *name, 3234 time_t atime, long atime_nsec, 3235 time_t mtime, long mtime_nsec, 3236 time_t ctime, long ctime_nsec) 3237{ 3238 struct attr_timbuf tstamp; 3239 tstamp.atime.tv_sec = atime; 3240 tstamp.mtime.tv_sec = mtime; 3241 tstamp.ctime.tv_sec = ctime; 3242#if defined (__hpux) && defined (__ia64) 3243 tstamp.atime.tv_nsec = atime_nsec; 3244 tstamp.mtime.tv_nsec = mtime_nsec; 3245 tstamp.ctime.tv_nsec = ctime_nsec; 3246#else 3247 tstamp.atime.tv_usec = atime_nsec / 1000; 3248 tstamp.mtime.tv_usec = mtime_nsec / 1000; 3249 tstamp.ctime.tv_usec = ctime_nsec / 1000; 3250#endif 3251 return (fcntl(fd,F_SETTIMES,&tstamp)); 3252} 3253#endif /* F_SETTIMES */ 3254 3255static int 3256set_times(struct archive_write_disk *a, 3257 int fd, int mode, const char *name, 3258 time_t atime, long atime_nanos, 3259 time_t birthtime, long birthtime_nanos, 3260 time_t mtime, long mtime_nanos, 3261 time_t cctime, long ctime_nanos) 3262{ 3263 /* Note: set_time doesn't use libarchive return conventions! 3264 * It uses syscall conventions. So 0 here instead of ARCHIVE_OK. */ 3265 int r1 = 0, r2 = 0; 3266 3267#ifdef F_SETTIMES 3268 /* 3269 * on Tru64 try own fcntl first which can restore even the 3270 * ctime, fall back to default code path below if it fails 3271 * or if we are not running as root 3272 */ 3273 if (a->user_uid == 0 && 3274 set_time_tru64(fd, mode, name, 3275 atime, atime_nanos, mtime, 3276 mtime_nanos, cctime, ctime_nanos) == 0) { 3277 return (ARCHIVE_OK); 3278 } 3279#else /* Tru64 */ 3280 (void)cctime; /* UNUSED */ 3281 (void)ctime_nanos; /* UNUSED */ 3282#endif /* Tru64 */ 3283 3284#ifdef HAVE_STRUCT_STAT_ST_BIRTHTIME 3285 /* 3286 * If you have struct stat.st_birthtime, we assume BSD 3287 * birthtime semantics, in which {f,l,}utimes() updates 3288 * birthtime to earliest mtime. So we set the time twice, 3289 * first using the birthtime, then using the mtime. If 3290 * birthtime == mtime, this isn't necessary, so we skip it. 3291 * If birthtime > mtime, then this won't work, so we skip it. 3292 */ 3293 if (birthtime < mtime 3294 || (birthtime == mtime && birthtime_nanos < mtime_nanos)) 3295 r1 = set_time(fd, mode, name, 3296 atime, atime_nanos, 3297 birthtime, birthtime_nanos); 3298#else 3299 (void)birthtime; /* UNUSED */ 3300 (void)birthtime_nanos; /* UNUSED */ 3301#endif 3302 r2 = set_time(fd, mode, name, 3303 atime, atime_nanos, 3304 mtime, mtime_nanos); 3305 if (r1 != 0 || r2 != 0) { 3306 archive_set_error(&a->archive, errno, 3307 "Can't restore time"); 3308 return (ARCHIVE_WARN); 3309 } 3310 return (ARCHIVE_OK); 3311} 3312 3313static int 3314set_times_from_entry(struct archive_write_disk *a) 3315{ 3316 time_t atime, birthtime, mtime, cctime; 3317 long atime_nsec, birthtime_nsec, mtime_nsec, ctime_nsec; 3318 3319 /* Suitable defaults. */ 3320 atime = birthtime = mtime = cctime = a->start_time; 3321 atime_nsec = birthtime_nsec = mtime_nsec = ctime_nsec = 0; 3322 3323 /* If no time was provided, we're done. */ 3324 if (!archive_entry_atime_is_set(a->entry) 3325#if HAVE_STRUCT_STAT_ST_BIRTHTIME 3326 && !archive_entry_birthtime_is_set(a->entry) 3327#endif 3328 && !archive_entry_mtime_is_set(a->entry)) 3329 return (ARCHIVE_OK); 3330 3331 if (archive_entry_atime_is_set(a->entry)) { 3332 atime = archive_entry_atime(a->entry); 3333 atime_nsec = archive_entry_atime_nsec(a->entry); 3334 } 3335 if (archive_entry_birthtime_is_set(a->entry)) { 3336 birthtime = archive_entry_birthtime(a->entry); 3337 birthtime_nsec = archive_entry_birthtime_nsec(a->entry); 3338 } 3339 if (archive_entry_mtime_is_set(a->entry)) { 3340 mtime = archive_entry_mtime(a->entry); 3341 mtime_nsec = archive_entry_mtime_nsec(a->entry); 3342 } 3343 if (archive_entry_ctime_is_set(a->entry)) { 3344 cctime = archive_entry_ctime(a->entry); 3345 ctime_nsec = archive_entry_ctime_nsec(a->entry); 3346 } 3347 3348 return set_times(a, a->fd, a->mode, a->name, 3349 atime, atime_nsec, 3350 birthtime, birthtime_nsec, 3351 mtime, mtime_nsec, 3352 cctime, ctime_nsec); 3353} 3354 3355static int 3356set_mode(struct archive_write_disk *a, int mode) 3357{ 3358 int r = ARCHIVE_OK; 3359 mode &= 07777; /* Strip off file type bits. */ 3360 3361 if (a->todo & TODO_SGID_CHECK) { 3362 /* 3363 * If we don't know the GID is right, we must stat() 3364 * to verify it. We can't just check the GID of this 3365 * process, since systems sometimes set GID from 3366 * the enclosing dir or based on ACLs. 3367 */ 3368 if ((r = lazy_stat(a)) != ARCHIVE_OK) 3369 return (r); 3370 if (a->pst->st_gid != a->gid) { 3371 mode &= ~ S_ISGID; 3372 if (a->flags & ARCHIVE_EXTRACT_OWNER) { 3373 /* 3374 * This is only an error if you 3375 * requested owner restore. If you 3376 * didn't, we'll try to restore 3377 * sgid/suid, but won't consider it a 3378 * problem if we can't. 3379 */ 3380 archive_set_error(&a->archive, -1, 3381 "Can't restore SGID bit"); 3382 r = ARCHIVE_WARN; 3383 } 3384 } 3385 /* While we're here, double-check the UID. */ 3386 if (a->pst->st_uid != a->uid 3387 && (a->todo & TODO_SUID)) { 3388 mode &= ~ S_ISUID; 3389 if (a->flags & ARCHIVE_EXTRACT_OWNER) { 3390 archive_set_error(&a->archive, -1, 3391 "Can't restore SUID bit"); 3392 r = ARCHIVE_WARN; 3393 } 3394 } 3395 a->todo &= ~TODO_SGID_CHECK; 3396 a->todo &= ~TODO_SUID_CHECK; 3397 } else if (a->todo & TODO_SUID_CHECK) { 3398 /* 3399 * If we don't know the UID is right, we can just check 3400 * the user, since all systems set the file UID from 3401 * the process UID. 3402 */ 3403 if (a->user_uid != a->uid) { 3404 mode &= ~ S_ISUID; 3405 if (a->flags & ARCHIVE_EXTRACT_OWNER) { 3406 archive_set_error(&a->archive, -1, 3407 "Can't make file SUID"); 3408 r = ARCHIVE_WARN; 3409 } 3410 } 3411 a->todo &= ~TODO_SUID_CHECK; 3412 } 3413 3414 if (S_ISLNK(a->mode)) { 3415#ifdef HAVE_LCHMOD 3416 /* 3417 * If this is a symlink, use lchmod(). If the 3418 * platform doesn't support lchmod(), just skip it. A 3419 * platform that doesn't provide a way to set 3420 * permissions on symlinks probably ignores 3421 * permissions on symlinks, so a failure here has no 3422 * impact. 3423 */ 3424 if (lchmod(a->name, mode) != 0) { 3425 switch (errno) { 3426 case ENOTSUP: 3427 case ENOSYS: 3428#if ENOTSUP != EOPNOTSUPP 3429 case EOPNOTSUPP: 3430#endif 3431 /* 3432 * if lchmod is defined but the platform 3433 * doesn't support it, silently ignore 3434 * error 3435 */ 3436 break; 3437 default: 3438 archive_set_error(&a->archive, errno, 3439 "Can't set permissions to 0%o", (int)mode); 3440 r = ARCHIVE_WARN; 3441 } 3442 } 3443#endif 3444 } else if (!S_ISDIR(a->mode)) { 3445 /* 3446 * If it's not a symlink and not a dir, then use 3447 * fchmod() or chmod(), depending on whether we have 3448 * an fd. Dirs get their perms set during the 3449 * post-extract fixup, which is handled elsewhere. 3450 */ 3451#ifdef HAVE_FCHMOD 3452 if (a->fd >= 0) { 3453 if (fchmod(a->fd, mode) != 0) { 3454 archive_set_error(&a->archive, errno, 3455 "Can't set permissions to 0%o", (int)mode); 3456 r = ARCHIVE_WARN; 3457 } 3458 } else 3459#endif 3460 /* If this platform lacks fchmod(), then 3461 * we'll just use chmod(). */ 3462 if (chmod(a->name, mode) != 0) { 3463 archive_set_error(&a->archive, errno, 3464 "Can't set permissions to 0%o", (int)mode); 3465 r = ARCHIVE_WARN; 3466 } 3467 } 3468 return (r); 3469} 3470 3471static int 3472set_fflags(struct archive_write_disk *a) 3473{ 3474 struct fixup_entry *le; 3475 unsigned long set, clear; 3476 int r; 3477 int critical_flags; 3478 mode_t mode = archive_entry_mode(a->entry); 3479 3480 /* 3481 * Make 'critical_flags' hold all file flags that can't be 3482 * immediately restored. For example, on BSD systems, 3483 * SF_IMMUTABLE prevents hardlinks from being created, so 3484 * should not be set until after any hardlinks are created. To 3485 * preserve some semblance of portability, this uses #ifdef 3486 * extensively. Ugly, but it works. 3487 * 3488 * Yes, Virginia, this does create a security race. It's mitigated 3489 * somewhat by the practice of creating dirs 0700 until the extract 3490 * is done, but it would be nice if we could do more than that. 3491 * People restoring critical file systems should be wary of 3492 * other programs that might try to muck with files as they're 3493 * being restored. 3494 */ 3495 /* Hopefully, the compiler will optimize this mess into a constant. */ 3496 critical_flags = 0; 3497#ifdef SF_IMMUTABLE 3498 critical_flags |= SF_IMMUTABLE; 3499#endif 3500#ifdef UF_IMMUTABLE 3501 critical_flags |= UF_IMMUTABLE; 3502#endif 3503#ifdef SF_APPEND 3504 critical_flags |= SF_APPEND; 3505#endif 3506#ifdef UF_APPEND 3507 critical_flags |= UF_APPEND; 3508#endif 3509#if defined(FS_APPEND_FL) 3510 critical_flags |= FS_APPEND_FL; 3511#elif defined(EXT2_APPEND_FL) 3512 critical_flags |= EXT2_APPEND_FL; 3513#endif 3514#if defined(FS_IMMUTABLE_FL) 3515 critical_flags |= FS_IMMUTABLE_FL; 3516#elif defined(EXT2_IMMUTABLE_FL) 3517 critical_flags |= EXT2_IMMUTABLE_FL; 3518#endif 3519#ifdef FS_JOURNAL_DATA_FL 3520 critical_flags |= FS_JOURNAL_DATA_FL; 3521#endif 3522 3523 if (a->todo & TODO_FFLAGS) { 3524 archive_entry_fflags(a->entry, &set, &clear); 3525 3526 /* 3527 * The first test encourages the compiler to eliminate 3528 * all of this if it's not necessary. 3529 */ 3530 if ((critical_flags != 0) && (set & critical_flags)) { 3531 le = current_fixup(a, a->name); 3532 if (le == NULL) 3533 return (ARCHIVE_FATAL); 3534 le->fixup |= TODO_FFLAGS; 3535 le->fflags_set = set; 3536 /* Store the mode if it's not already there. */ 3537 if ((le->fixup & TODO_MODE) == 0) 3538 le->mode = mode; 3539 } else { 3540 r = set_fflags_platform(a, a->fd, 3541 a->name, mode, set, clear); 3542 if (r != ARCHIVE_OK) 3543 return (r); 3544 } 3545 } 3546 return (ARCHIVE_OK); 3547} 3548 3549static int 3550clear_nochange_fflags(struct archive_write_disk *a) 3551{ 3552 int nochange_flags; 3553 mode_t mode = archive_entry_mode(a->entry); 3554 3555 /* Hopefully, the compiler will optimize this mess into a constant. */ 3556 nochange_flags = 0; 3557#ifdef SF_IMMUTABLE 3558 nochange_flags |= SF_IMMUTABLE; 3559#endif 3560#ifdef UF_IMMUTABLE 3561 nochange_flags |= UF_IMMUTABLE; 3562#endif 3563#ifdef SF_APPEND 3564 nochange_flags |= SF_APPEND; 3565#endif 3566#ifdef UF_APPEND 3567 nochange_flags |= UF_APPEND; 3568#endif 3569#ifdef EXT2_APPEND_FL 3570 nochange_flags |= EXT2_APPEND_FL; 3571#endif 3572#ifdef EXT2_IMMUTABLE_FL 3573 nochange_flags |= EXT2_IMMUTABLE_FL; 3574#endif 3575 3576 return (set_fflags_platform(a, a->fd, a->name, mode, 0, 3577 nochange_flags)); 3578} 3579 3580 3581#if ( defined(HAVE_LCHFLAGS) || defined(HAVE_CHFLAGS) || defined(HAVE_FCHFLAGS) ) && defined(HAVE_STRUCT_STAT_ST_FLAGS) 3582/* 3583 * BSD reads flags using stat() and sets them with one of {f,l,}chflags() 3584 */ 3585static int 3586set_fflags_platform(struct archive_write_disk *a, int fd, const char *name, 3587 mode_t mode, unsigned long set, unsigned long clear) 3588{ 3589 int r; 3590 3591 (void)mode; /* UNUSED */ 3592 if (set == 0 && clear == 0) 3593 return (ARCHIVE_OK); 3594 3595 /* 3596 * XXX Is the stat here really necessary? Or can I just use 3597 * the 'set' flags directly? In particular, I'm not sure 3598 * about the correct approach if we're overwriting an existing 3599 * file that already has flags on it. XXX 3600 */ 3601 if ((r = lazy_stat(a)) != ARCHIVE_OK) 3602 return (r); 3603 3604 a->st.st_flags &= ~clear; 3605 a->st.st_flags |= set; 3606#ifdef HAVE_FCHFLAGS 3607 /* If platform has fchflags() and we were given an fd, use it. */ 3608 if (fd >= 0 && fchflags(fd, a->st.st_flags) == 0) 3609 return (ARCHIVE_OK); 3610#endif 3611 /* 3612 * If we can't use the fd to set the flags, we'll use the 3613 * pathname to set flags. We prefer lchflags() but will use 3614 * chflags() if we must. 3615 */ 3616#ifdef HAVE_LCHFLAGS 3617 if (lchflags(name, a->st.st_flags) == 0) 3618 return (ARCHIVE_OK); 3619#elif defined(HAVE_CHFLAGS) 3620 if (S_ISLNK(a->st.st_mode)) { 3621 archive_set_error(&a->archive, errno, 3622 "Can't set file flags on symlink."); 3623 return (ARCHIVE_WARN); 3624 } 3625 if (chflags(name, a->st.st_flags) == 0) 3626 return (ARCHIVE_OK); 3627#endif 3628 archive_set_error(&a->archive, errno, 3629 "Failed to set file flags"); 3630 return (ARCHIVE_WARN); 3631} 3632 3633#elif (defined(FS_IOC_GETFLAGS) && defined(FS_IOC_SETFLAGS) && \ 3634 defined(HAVE_WORKING_FS_IOC_GETFLAGS)) || \ 3635 (defined(EXT2_IOC_GETFLAGS) && defined(EXT2_IOC_SETFLAGS) && \ 3636 defined(HAVE_WORKING_EXT2_IOC_GETFLAGS)) 3637/* 3638 * Linux uses ioctl() to read and write file flags. 3639 */ 3640static int 3641set_fflags_platform(struct archive_write_disk *a, int fd, const char *name, 3642 mode_t mode, unsigned long set, unsigned long clear) 3643{ 3644 int ret; 3645 int myfd = fd; 3646 int newflags, oldflags; 3647 int sf_mask = 0; 3648 3649 if (set == 0 && clear == 0) 3650 return (ARCHIVE_OK); 3651 /* Only regular files and dirs can have flags. */ 3652 if (!S_ISREG(mode) && !S_ISDIR(mode)) 3653 return (ARCHIVE_OK); 3654 3655 /* If we weren't given an fd, open it ourselves. */ 3656 if (myfd < 0) { 3657 myfd = open(name, O_RDONLY | O_NONBLOCK | O_BINARY | O_CLOEXEC); 3658 __archive_ensure_cloexec_flag(myfd); 3659 } 3660 if (myfd < 0) 3661 return (ARCHIVE_OK); 3662 3663 /* 3664 * Linux has no define for the flags that are only settable by 3665 * the root user. This code may seem a little complex, but 3666 * there seem to be some Linux systems that lack these 3667 * defines. (?) The code below degrades reasonably gracefully 3668 * if sf_mask is incomplete. 3669 */ 3670#if defined(FS_IMMUTABLE_FL) 3671 sf_mask |= FS_IMMUTABLE_FL; 3672#elif defined(EXT2_IMMUTABLE_FL) 3673 sf_mask |= EXT2_IMMUTABLE_FL; 3674#endif 3675#if defined(FS_APPEND_FL) 3676 sf_mask |= FS_APPEND_FL; 3677#elif defined(EXT2_APPEND_FL) 3678 sf_mask |= EXT2_APPEND_FL; 3679#endif 3680#if defined(FS_JOURNAL_DATA_FL) 3681 sf_mask |= FS_JOURNAL_DATA_FL; 3682#endif 3683 /* 3684 * XXX As above, this would be way simpler if we didn't have 3685 * to read the current flags from disk. XXX 3686 */ 3687 ret = ARCHIVE_OK; 3688 3689 /* Read the current file flags. */ 3690 if (ioctl(myfd, 3691#ifdef FS_IOC_GETFLAGS 3692 FS_IOC_GETFLAGS, 3693#else 3694 EXT2_IOC_GETFLAGS, 3695#endif 3696 &oldflags) < 0) 3697 goto fail; 3698 3699 /* Try setting the flags as given. */ 3700 newflags = (oldflags & ~clear) | set; 3701 if (ioctl(myfd, 3702#ifdef FS_IOC_SETFLAGS 3703 FS_IOC_SETFLAGS, 3704#else 3705 EXT2_IOC_SETFLAGS, 3706#endif 3707 &newflags) >= 0) 3708 goto cleanup; 3709 if (errno != EPERM) 3710 goto fail; 3711 3712 /* If we couldn't set all the flags, try again with a subset. */ 3713 newflags &= ~sf_mask; 3714 oldflags &= sf_mask; 3715 newflags |= oldflags; 3716 if (ioctl(myfd, 3717#ifdef FS_IOC_SETFLAGS 3718 FS_IOC_SETFLAGS, 3719#else 3720 EXT2_IOC_SETFLAGS, 3721#endif 3722 &newflags) >= 0) 3723 goto cleanup; 3724 3725 /* We couldn't set the flags, so report the failure. */ 3726fail: 3727 archive_set_error(&a->archive, errno, 3728 "Failed to set file flags"); 3729 ret = ARCHIVE_WARN; 3730cleanup: 3731 if (fd < 0) 3732 close(myfd); 3733 return (ret); 3734} 3735 3736#else 3737 3738/* 3739 * Of course, some systems have neither BSD chflags() nor Linux' flags 3740 * support through ioctl(). 3741 */ 3742static int 3743set_fflags_platform(struct archive_write_disk *a, int fd, const char *name, 3744 mode_t mode, unsigned long set, unsigned long clear) 3745{ 3746 (void)a; /* UNUSED */ 3747 (void)fd; /* UNUSED */ 3748 (void)name; /* UNUSED */ 3749 (void)mode; /* UNUSED */ 3750 (void)set; /* UNUSED */ 3751 (void)clear; /* UNUSED */ 3752 return (ARCHIVE_OK); 3753} 3754 3755#endif /* __linux */ 3756 3757#ifndef HAVE_COPYFILE_H 3758/* Default is to simply drop Mac extended metadata. */ 3759static int 3760set_mac_metadata(struct archive_write_disk *a, const char *pathname, 3761 const void *metadata, size_t metadata_size) 3762{ 3763 (void)a; /* UNUSED */ 3764 (void)pathname; /* UNUSED */ 3765 (void)metadata; /* UNUSED */ 3766 (void)metadata_size; /* UNUSED */ 3767 return (ARCHIVE_OK); 3768} 3769 3770static int 3771fixup_appledouble(struct archive_write_disk *a, const char *pathname) 3772{ 3773 (void)a; /* UNUSED */ 3774 (void)pathname; /* UNUSED */ 3775 return (ARCHIVE_OK); 3776} 3777#else 3778 3779/* 3780 * On Mac OS, we use copyfile() to unpack the metadata and 3781 * apply it to the target file. 3782 */ 3783 3784#if defined(HAVE_SYS_XATTR_H) 3785static int 3786copy_xattrs(struct archive_write_disk *a, int tmpfd, int dffd) 3787{ 3788 ssize_t xattr_size; 3789 char *xattr_names = NULL, *xattr_val = NULL; 3790 int ret = ARCHIVE_OK, xattr_i; 3791 3792 xattr_size = flistxattr(tmpfd, NULL, 0, 0); 3793 if (xattr_size == -1) { 3794 archive_set_error(&a->archive, errno, 3795 "Failed to read metadata(xattr)"); 3796 ret = ARCHIVE_WARN; 3797 goto exit_xattr; 3798 } 3799 xattr_names = malloc(xattr_size); 3800 if (xattr_names == NULL) { 3801 archive_set_error(&a->archive, ENOMEM, 3802 "Can't allocate memory for metadata(xattr)"); 3803 ret = ARCHIVE_FATAL; 3804 goto exit_xattr; 3805 } 3806 xattr_size = flistxattr(tmpfd, xattr_names, xattr_size, 0); 3807 if (xattr_size == -1) { 3808 archive_set_error(&a->archive, errno, 3809 "Failed to read metadata(xattr)"); 3810 ret = ARCHIVE_WARN; 3811 goto exit_xattr; 3812 } 3813 for (xattr_i = 0; xattr_i < xattr_size; 3814 xattr_i += strlen(xattr_names + xattr_i) + 1) { 3815 char *xattr_val_saved; 3816 ssize_t s; 3817 int f; 3818 3819 s = fgetxattr(tmpfd, xattr_names + xattr_i, NULL, 0, 0, 0); 3820 if (s == -1) { 3821 archive_set_error(&a->archive, errno, 3822 "Failed to get metadata(xattr)"); 3823 ret = ARCHIVE_WARN; 3824 goto exit_xattr; 3825 } 3826 xattr_val_saved = xattr_val; 3827 xattr_val = realloc(xattr_val, s); 3828 if (xattr_val == NULL) { 3829 archive_set_error(&a->archive, ENOMEM, 3830 "Failed to get metadata(xattr)"); 3831 ret = ARCHIVE_WARN; 3832 free(xattr_val_saved); 3833 goto exit_xattr; 3834 } 3835 s = fgetxattr(tmpfd, xattr_names + xattr_i, xattr_val, s, 0, 0); 3836 if (s == -1) { 3837 archive_set_error(&a->archive, errno, 3838 "Failed to get metadata(xattr)"); 3839 ret = ARCHIVE_WARN; 3840 goto exit_xattr; 3841 } 3842 f = fsetxattr(dffd, xattr_names + xattr_i, xattr_val, s, 0, 0); 3843 if (f == -1) { 3844 archive_set_error(&a->archive, errno, 3845 "Failed to get metadata(xattr)"); 3846 ret = ARCHIVE_WARN; 3847 goto exit_xattr; 3848 } 3849 } 3850exit_xattr: 3851 free(xattr_names); 3852 free(xattr_val); 3853 return (ret); 3854} 3855#endif 3856 3857static int 3858copy_acls(struct archive_write_disk *a, int tmpfd, int dffd) 3859{ 3860#ifndef HAVE_SYS_ACL_H 3861 return 0; 3862#else 3863 acl_t acl, dfacl = NULL; 3864 int acl_r, ret = ARCHIVE_OK; 3865 3866 acl = acl_get_fd(tmpfd); 3867 if (acl == NULL) { 3868 if (errno == ENOENT) 3869 /* There are not any ACLs. */ 3870 return (ret); 3871 archive_set_error(&a->archive, errno, 3872 "Failed to get metadata(acl)"); 3873 ret = ARCHIVE_WARN; 3874 goto exit_acl; 3875 } 3876 dfacl = acl_dup(acl); 3877 acl_r = acl_set_fd(dffd, dfacl); 3878 if (acl_r == -1) { 3879 archive_set_error(&a->archive, errno, 3880 "Failed to get metadata(acl)"); 3881 ret = ARCHIVE_WARN; 3882 goto exit_acl; 3883 } 3884exit_acl: 3885 if (acl) 3886 acl_free(acl); 3887 if (dfacl) 3888 acl_free(dfacl); 3889 return (ret); 3890#endif 3891} 3892 3893static int 3894create_tempdatafork(struct archive_write_disk *a, const char *pathname) 3895{ 3896 struct archive_string tmpdatafork; 3897 int tmpfd; 3898 3899 archive_string_init(&tmpdatafork); 3900 archive_strcpy(&tmpdatafork, "tar.md.XXXXXX"); 3901 tmpfd = mkstemp(tmpdatafork.s); 3902 if (tmpfd < 0) { 3903 archive_set_error(&a->archive, errno, 3904 "Failed to mkstemp"); 3905 archive_string_free(&tmpdatafork); 3906 return (-1); 3907 } 3908 if (copyfile(pathname, tmpdatafork.s, 0, 3909 COPYFILE_UNPACK | COPYFILE_NOFOLLOW 3910 | COPYFILE_ACL | COPYFILE_XATTR) < 0) { 3911 archive_set_error(&a->archive, errno, 3912 "Failed to restore metadata"); 3913 close(tmpfd); 3914 tmpfd = -1; 3915 } 3916 unlink(tmpdatafork.s); 3917 archive_string_free(&tmpdatafork); 3918 return (tmpfd); 3919} 3920 3921static int 3922copy_metadata(struct archive_write_disk *a, const char *metadata, 3923 const char *datafork, int datafork_compressed) 3924{ 3925 int ret = ARCHIVE_OK; 3926 3927 if (datafork_compressed) { 3928 int dffd, tmpfd; 3929 3930 tmpfd = create_tempdatafork(a, metadata); 3931 if (tmpfd == -1) 3932 return (ARCHIVE_WARN); 3933 3934 /* 3935 * Do not open the data fork compressed by HFS+ compression 3936 * with at least a writing mode(O_RDWR or O_WRONLY). it 3937 * makes the data fork uncompressed. 3938 */ 3939 dffd = open(datafork, 0); 3940 if (dffd == -1) { 3941 archive_set_error(&a->archive, errno, 3942 "Failed to open the data fork for metadata"); 3943 close(tmpfd); 3944 return (ARCHIVE_WARN); 3945 } 3946 3947#if defined(HAVE_SYS_XATTR_H) 3948 ret = copy_xattrs(a, tmpfd, dffd); 3949 if (ret == ARCHIVE_OK) 3950#endif 3951 ret = copy_acls(a, tmpfd, dffd); 3952 close(tmpfd); 3953 close(dffd); 3954 } else { 3955 if (copyfile(metadata, datafork, 0, 3956 COPYFILE_UNPACK | COPYFILE_NOFOLLOW 3957 | COPYFILE_ACL | COPYFILE_XATTR) < 0) { 3958 archive_set_error(&a->archive, errno, 3959 "Failed to restore metadata"); 3960 ret = ARCHIVE_WARN; 3961 } 3962 } 3963 return (ret); 3964} 3965 3966static int 3967set_mac_metadata(struct archive_write_disk *a, const char *pathname, 3968 const void *metadata, size_t metadata_size) 3969{ 3970 struct archive_string tmp; 3971 ssize_t written; 3972 int fd; 3973 int ret = ARCHIVE_OK; 3974 3975 /* This would be simpler if copyfile() could just accept the 3976 * metadata as a block of memory; then we could sidestep this 3977 * silly dance of writing the data to disk just so that 3978 * copyfile() can read it back in again. */ 3979 archive_string_init(&tmp); 3980 archive_strcpy(&tmp, pathname); 3981 archive_strcat(&tmp, ".XXXXXX"); 3982 fd = mkstemp(tmp.s); 3983 3984 if (fd < 0) { 3985 archive_set_error(&a->archive, errno, 3986 "Failed to restore metadata"); 3987 archive_string_free(&tmp); 3988 return (ARCHIVE_WARN); 3989 } 3990 written = write(fd, metadata, metadata_size); 3991 close(fd); 3992 if ((size_t)written != metadata_size) { 3993 archive_set_error(&a->archive, errno, 3994 "Failed to restore metadata"); 3995 ret = ARCHIVE_WARN; 3996 } else { 3997 int compressed; 3998 3999#if defined(UF_COMPRESSED) 4000 if ((a->todo & TODO_HFS_COMPRESSION) != 0 && 4001 (ret = lazy_stat(a)) == ARCHIVE_OK) 4002 compressed = a->st.st_flags & UF_COMPRESSED; 4003 else 4004#endif 4005 compressed = 0; 4006 ret = copy_metadata(a, tmp.s, pathname, compressed); 4007 } 4008 unlink(tmp.s); 4009 archive_string_free(&tmp); 4010 return (ret); 4011} 4012 4013static int 4014fixup_appledouble(struct archive_write_disk *a, const char *pathname) 4015{ 4016 char buff[8]; 4017 struct stat st; 4018 const char *p; 4019 struct archive_string datafork; 4020 int fd = -1, ret = ARCHIVE_OK; 4021 4022 archive_string_init(&datafork); 4023 /* Check if the current file name is a type of the resource 4024 * fork file. */ 4025 p = strrchr(pathname, '/'); 4026 if (p == NULL) 4027 p = pathname; 4028 else 4029 p++; 4030 if (p[0] != '.' || p[1] != '_') 4031 goto skip_appledouble; 4032 4033 /* 4034 * Check if the data fork file exists. 4035 * 4036 * TODO: Check if this write disk object has handled it. 4037 */ 4038 archive_strncpy(&datafork, pathname, p - pathname); 4039 archive_strcat(&datafork, p + 2); 4040 if (lstat(datafork.s, &st) == -1 || 4041 (st.st_mode & AE_IFMT) != AE_IFREG) 4042 goto skip_appledouble; 4043 4044 /* 4045 * Check if the file is in the AppleDouble form. 4046 */ 4047 fd = open(pathname, O_RDONLY | O_BINARY | O_CLOEXEC); 4048 __archive_ensure_cloexec_flag(fd); 4049 if (fd == -1) { 4050 archive_set_error(&a->archive, errno, 4051 "Failed to open a restoring file"); 4052 ret = ARCHIVE_WARN; 4053 goto skip_appledouble; 4054 } 4055 if (read(fd, buff, 8) == -1) { 4056 archive_set_error(&a->archive, errno, 4057 "Failed to read a restoring file"); 4058 close(fd); 4059 ret = ARCHIVE_WARN; 4060 goto skip_appledouble; 4061 } 4062 close(fd); 4063 /* Check AppleDouble Magic Code. */ 4064 if (archive_be32dec(buff) != 0x00051607) 4065 goto skip_appledouble; 4066 /* Check AppleDouble Version. */ 4067 if (archive_be32dec(buff+4) != 0x00020000) 4068 goto skip_appledouble; 4069 4070 ret = copy_metadata(a, pathname, datafork.s, 4071#if defined(UF_COMPRESSED) 4072 st.st_flags & UF_COMPRESSED); 4073#else 4074 0); 4075#endif 4076 if (ret == ARCHIVE_OK) { 4077 unlink(pathname); 4078 ret = ARCHIVE_EOF; 4079 } 4080skip_appledouble: 4081 archive_string_free(&datafork); 4082 return (ret); 4083} 4084#endif 4085 4086#if ARCHIVE_XATTR_LINUX || ARCHIVE_XATTR_DARWIN || ARCHIVE_XATTR_AIX 4087/* 4088 * Restore extended attributes - Linux, Darwin and AIX implementations: 4089 * AIX' ea interface is syntaxwise identical to the Linux xattr interface. 4090 */ 4091static int 4092set_xattrs(struct archive_write_disk *a) 4093{ 4094 struct archive_entry *entry = a->entry; 4095 static int warning_done = 0; 4096 int ret = ARCHIVE_OK; 4097 int i = archive_entry_xattr_reset(entry); 4098 4099 while (i--) { 4100 const char *name; 4101 const void *value; 4102 size_t size; 4103 archive_entry_xattr_next(entry, &name, &value, &size); 4104 if (name != NULL && 4105 strncmp(name, "xfsroot.", 8) != 0 && 4106 strncmp(name, "system.", 7) != 0) { 4107 int e; 4108 if (a->fd >= 0) { 4109#if ARCHIVE_XATTR_LINUX 4110 e = fsetxattr(a->fd, name, value, size, 0); 4111#elif ARCHIVE_XATTR_DARWIN 4112 e = fsetxattr(a->fd, name, value, size, 0, 0); 4113#elif ARCHIVE_XATTR_AIX 4114 e = fsetea(a->fd, name, value, size, 0); 4115#endif 4116 } else { 4117#if ARCHIVE_XATTR_LINUX 4118 e = lsetxattr(archive_entry_pathname(entry), 4119 name, value, size, 0); 4120#elif ARCHIVE_XATTR_DARWIN 4121 e = setxattr(archive_entry_pathname(entry), 4122 name, value, size, 0, XATTR_NOFOLLOW); 4123#elif ARCHIVE_XATTR_AIX 4124 e = lsetea(archive_entry_pathname(entry), 4125 name, value, size, 0); 4126#endif 4127 } 4128 if (e == -1) { 4129 if (errno == ENOTSUP || errno == ENOSYS) { 4130 if (!warning_done) { 4131 warning_done = 1; 4132 archive_set_error(&a->archive, 4133 errno, 4134 "Cannot restore extended " 4135 "attributes on this file " 4136 "system"); 4137 } 4138 } else 4139 archive_set_error(&a->archive, errno, 4140 "Failed to set extended attribute"); 4141 ret = ARCHIVE_WARN; 4142 } 4143 } else { 4144 archive_set_error(&a->archive, 4145 ARCHIVE_ERRNO_FILE_FORMAT, 4146 "Invalid extended attribute encountered"); 4147 ret = ARCHIVE_WARN; 4148 } 4149 } 4150 return (ret); 4151} 4152#elif ARCHIVE_XATTR_FREEBSD 4153/* 4154 * Restore extended attributes - FreeBSD implementation 4155 */ 4156static int 4157set_xattrs(struct archive_write_disk *a) 4158{ 4159 struct archive_entry *entry = a->entry; 4160 static int warning_done = 0; 4161 int ret = ARCHIVE_OK; 4162 int i = archive_entry_xattr_reset(entry); 4163 4164 while (i--) { 4165 const char *name; 4166 const void *value; 4167 size_t size; 4168 archive_entry_xattr_next(entry, &name, &value, &size); 4169 if (name != NULL) { 4170 ssize_t e; 4171 int namespace; 4172 4173 if (strncmp(name, "user.", 5) == 0) { 4174 /* "user." attributes go to user namespace */ 4175 name += 5; 4176 namespace = EXTATTR_NAMESPACE_USER; 4177 } else { 4178 /* Warn about other extended attributes. */ 4179 archive_set_error(&a->archive, 4180 ARCHIVE_ERRNO_FILE_FORMAT, 4181 "Can't restore extended attribute ``%s''", 4182 name); 4183 ret = ARCHIVE_WARN; 4184 continue; 4185 } 4186 errno = 0; 4187 4188 if (a->fd >= 0) { 4189 e = extattr_set_fd(a->fd, namespace, name, 4190 value, size); 4191 } else { 4192 e = extattr_set_link( 4193 archive_entry_pathname(entry), namespace, 4194 name, value, size); 4195 } 4196 if (e != (ssize_t)size) { 4197 if (errno == ENOTSUP || errno == ENOSYS) { 4198 if (!warning_done) { 4199 warning_done = 1; 4200 archive_set_error(&a->archive, 4201 errno, 4202 "Cannot restore extended " 4203 "attributes on this file " 4204 "system"); 4205 } 4206 } else { 4207 archive_set_error(&a->archive, errno, 4208 "Failed to set extended attribute"); 4209 } 4210 4211 ret = ARCHIVE_WARN; 4212 } 4213 } 4214 } 4215 return (ret); 4216} 4217#else 4218/* 4219 * Restore extended attributes - stub implementation for unsupported systems 4220 */ 4221static int 4222set_xattrs(struct archive_write_disk *a) 4223{ 4224 static int warning_done = 0; 4225 4226 /* If there aren't any extended attributes, then it's okay not 4227 * to extract them, otherwise, issue a single warning. */ 4228 if (archive_entry_xattr_count(a->entry) != 0 && !warning_done) { 4229 warning_done = 1; 4230 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 4231 "Cannot restore extended attributes on this system"); 4232 return (ARCHIVE_WARN); 4233 } 4234 /* Warning was already emitted; suppress further warnings. */ 4235 return (ARCHIVE_OK); 4236} 4237#endif 4238 4239/* 4240 * Test if file on disk is older than entry. 4241 */ 4242static int 4243older(struct stat *st, struct archive_entry *entry) 4244{ 4245 /* First, test the seconds and return if we have a definite answer. */ 4246 /* Definitely older. */ 4247 if (to_int64_time(st->st_mtime) < to_int64_time(archive_entry_mtime(entry))) 4248 return (1); 4249 /* Definitely younger. */ 4250 if (to_int64_time(st->st_mtime) > to_int64_time(archive_entry_mtime(entry))) 4251 return (0); 4252 /* If this platform supports fractional seconds, try those. */ 4253#if HAVE_STRUCT_STAT_ST_MTIMESPEC_TV_NSEC 4254 /* Definitely older. */ 4255 if (st->st_mtimespec.tv_nsec < archive_entry_mtime_nsec(entry)) 4256 return (1); 4257#elif HAVE_STRUCT_STAT_ST_MTIM_TV_NSEC 4258 /* Definitely older. */ 4259 if (st->st_mtim.tv_nsec < archive_entry_mtime_nsec(entry)) 4260 return (1); 4261#elif HAVE_STRUCT_STAT_ST_MTIME_N 4262 /* older. */ 4263 if (st->st_mtime_n < archive_entry_mtime_nsec(entry)) 4264 return (1); 4265#elif HAVE_STRUCT_STAT_ST_UMTIME 4266 /* older. */ 4267 if (st->st_umtime * 1000 < archive_entry_mtime_nsec(entry)) 4268 return (1); 4269#elif HAVE_STRUCT_STAT_ST_MTIME_USEC 4270 /* older. */ 4271 if (st->st_mtime_usec * 1000 < archive_entry_mtime_nsec(entry)) 4272 return (1); 4273#else 4274 /* This system doesn't have high-res timestamps. */ 4275#endif 4276 /* Same age or newer, so not older. */ 4277 return (0); 4278} 4279 4280#ifndef ARCHIVE_ACL_SUPPORT 4281int 4282archive_write_disk_set_acls(struct archive *a, int fd, const char *name, 4283 struct archive_acl *abstract_acl, __LA_MODE_T mode) 4284{ 4285 (void)a; /* UNUSED */ 4286 (void)fd; /* UNUSED */ 4287 (void)name; /* UNUSED */ 4288 (void)abstract_acl; /* UNUSED */ 4289 (void)mode; /* UNUSED */ 4290 return (ARCHIVE_OK); 4291} 4292#endif 4293 4294#endif /* !_WIN32 || __CYGWIN__ */ 4295 4296