archive_write_disk_posix.c revision 342360
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, la_int64_t d, la_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 * HYPOTHESIS: 1709 * If we're not root, we won't be setting any security 1710 * attributes that may be wiped by the set_mode() routine 1711 * below. We also can't set xattr on non-owner-writable files, 1712 * which may be the state after set_mode(). Perform 1713 * set_xattrs() first based on these constraints. 1714 */ 1715 if (a->user_uid != 0 && 1716 (a->todo & TODO_XATTR)) { 1717 int r2 = set_xattrs(a); 1718 if (r2 < ret) ret = r2; 1719 } 1720 1721 /* 1722 * set_mode must precede ACLs on systems such as Solaris and 1723 * FreeBSD where setting the mode implicitly clears extended ACLs 1724 */ 1725 if (a->todo & TODO_MODE) { 1726 int r2 = set_mode(a, a->mode); 1727 if (r2 < ret) ret = r2; 1728 } 1729 1730 /* 1731 * Security-related extended attributes (such as 1732 * security.capability on Linux) have to be restored last, 1733 * since they're implicitly removed by other file changes. 1734 * We do this last only when root. 1735 */ 1736 if (a->user_uid == 0 && 1737 (a->todo & TODO_XATTR)) { 1738 int r2 = set_xattrs(a); 1739 if (r2 < ret) ret = r2; 1740 } 1741 1742 /* 1743 * Some flags prevent file modification; they must be restored after 1744 * file contents are written. 1745 */ 1746 if (a->todo & TODO_FFLAGS) { 1747 int r2 = set_fflags(a); 1748 if (r2 < ret) ret = r2; 1749 } 1750 1751 /* 1752 * Time must follow most other metadata; 1753 * otherwise atime will get changed. 1754 */ 1755 if (a->todo & TODO_TIMES) { 1756 int r2 = set_times_from_entry(a); 1757 if (r2 < ret) ret = r2; 1758 } 1759 1760 /* 1761 * Mac extended metadata includes ACLs. 1762 */ 1763 if (a->todo & TODO_MAC_METADATA) { 1764 const void *metadata; 1765 size_t metadata_size; 1766 metadata = archive_entry_mac_metadata(a->entry, &metadata_size); 1767 if (metadata != NULL && metadata_size > 0) { 1768 int r2 = set_mac_metadata(a, archive_entry_pathname( 1769 a->entry), metadata, metadata_size); 1770 if (r2 < ret) ret = r2; 1771 } 1772 } 1773 1774 /* 1775 * ACLs must be restored after timestamps because there are 1776 * ACLs that prevent attribute changes (including time). 1777 */ 1778 if (a->todo & TODO_ACLS) { 1779 int r2; 1780 r2 = archive_write_disk_set_acls(&a->archive, a->fd, 1781 archive_entry_pathname(a->entry), 1782 archive_entry_acl(a->entry), 1783 archive_entry_mode(a->entry)); 1784 if (r2 < ret) ret = r2; 1785 } 1786 1787finish_metadata: 1788 /* If there's an fd, we can close it now. */ 1789 if (a->fd >= 0) { 1790 close(a->fd); 1791 a->fd = -1; 1792 } 1793 /* If there's an entry, we can release it now. */ 1794 if (a->entry) { 1795 archive_entry_free(a->entry); 1796 a->entry = NULL; 1797 } 1798 a->archive.state = ARCHIVE_STATE_HEADER; 1799 return (ret); 1800} 1801 1802int 1803archive_write_disk_set_group_lookup(struct archive *_a, 1804 void *private_data, 1805 la_int64_t (*lookup_gid)(void *private, const char *gname, la_int64_t gid), 1806 void (*cleanup_gid)(void *private)) 1807{ 1808 struct archive_write_disk *a = (struct archive_write_disk *)_a; 1809 archive_check_magic(&a->archive, ARCHIVE_WRITE_DISK_MAGIC, 1810 ARCHIVE_STATE_ANY, "archive_write_disk_set_group_lookup"); 1811 1812 if (a->cleanup_gid != NULL && a->lookup_gid_data != NULL) 1813 (a->cleanup_gid)(a->lookup_gid_data); 1814 1815 a->lookup_gid = lookup_gid; 1816 a->cleanup_gid = cleanup_gid; 1817 a->lookup_gid_data = private_data; 1818 return (ARCHIVE_OK); 1819} 1820 1821int 1822archive_write_disk_set_user_lookup(struct archive *_a, 1823 void *private_data, 1824 int64_t (*lookup_uid)(void *private, const char *uname, int64_t uid), 1825 void (*cleanup_uid)(void *private)) 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_set_user_lookup"); 1830 1831 if (a->cleanup_uid != NULL && a->lookup_uid_data != NULL) 1832 (a->cleanup_uid)(a->lookup_uid_data); 1833 1834 a->lookup_uid = lookup_uid; 1835 a->cleanup_uid = cleanup_uid; 1836 a->lookup_uid_data = private_data; 1837 return (ARCHIVE_OK); 1838} 1839 1840int64_t 1841archive_write_disk_gid(struct archive *_a, const char *name, la_int64_t id) 1842{ 1843 struct archive_write_disk *a = (struct archive_write_disk *)_a; 1844 archive_check_magic(&a->archive, ARCHIVE_WRITE_DISK_MAGIC, 1845 ARCHIVE_STATE_ANY, "archive_write_disk_gid"); 1846 if (a->lookup_gid) 1847 return (a->lookup_gid)(a->lookup_gid_data, name, id); 1848 return (id); 1849} 1850 1851int64_t 1852archive_write_disk_uid(struct archive *_a, const char *name, la_int64_t id) 1853{ 1854 struct archive_write_disk *a = (struct archive_write_disk *)_a; 1855 archive_check_magic(&a->archive, ARCHIVE_WRITE_DISK_MAGIC, 1856 ARCHIVE_STATE_ANY, "archive_write_disk_uid"); 1857 if (a->lookup_uid) 1858 return (a->lookup_uid)(a->lookup_uid_data, name, id); 1859 return (id); 1860} 1861 1862/* 1863 * Create a new archive_write_disk object and initialize it with global state. 1864 */ 1865struct archive * 1866archive_write_disk_new(void) 1867{ 1868 struct archive_write_disk *a; 1869 1870 a = (struct archive_write_disk *)calloc(1, sizeof(*a)); 1871 if (a == NULL) 1872 return (NULL); 1873 a->archive.magic = ARCHIVE_WRITE_DISK_MAGIC; 1874 /* We're ready to write a header immediately. */ 1875 a->archive.state = ARCHIVE_STATE_HEADER; 1876 a->archive.vtable = archive_write_disk_vtable(); 1877 a->start_time = time(NULL); 1878 /* Query and restore the umask. */ 1879 umask(a->user_umask = umask(0)); 1880#ifdef HAVE_GETEUID 1881 a->user_uid = geteuid(); 1882#endif /* HAVE_GETEUID */ 1883 if (archive_string_ensure(&a->path_safe, 512) == NULL) { 1884 free(a); 1885 return (NULL); 1886 } 1887#ifdef HAVE_ZLIB_H 1888 a->decmpfs_compression_level = 5; 1889#endif 1890 return (&a->archive); 1891} 1892 1893 1894/* 1895 * If pathname is longer than PATH_MAX, chdir to a suitable 1896 * intermediate dir and edit the path down to a shorter suffix. Note 1897 * that this routine never returns an error; if the chdir() attempt 1898 * fails for any reason, we just go ahead with the long pathname. The 1899 * object creation is likely to fail, but any error will get handled 1900 * at that time. 1901 */ 1902#if defined(HAVE_FCHDIR) && defined(PATH_MAX) 1903static void 1904edit_deep_directories(struct archive_write_disk *a) 1905{ 1906 int ret; 1907 char *tail = a->name; 1908 1909 /* If path is short, avoid the open() below. */ 1910 if (strlen(tail) < PATH_MAX) 1911 return; 1912 1913 /* Try to record our starting dir. */ 1914 a->restore_pwd = open(".", O_RDONLY | O_BINARY | O_CLOEXEC); 1915 __archive_ensure_cloexec_flag(a->restore_pwd); 1916 if (a->restore_pwd < 0) 1917 return; 1918 1919 /* As long as the path is too long... */ 1920 while (strlen(tail) >= PATH_MAX) { 1921 /* Locate a dir prefix shorter than PATH_MAX. */ 1922 tail += PATH_MAX - 8; 1923 while (tail > a->name && *tail != '/') 1924 tail--; 1925 /* Exit if we find a too-long path component. */ 1926 if (tail <= a->name) 1927 return; 1928 /* Create the intermediate dir and chdir to it. */ 1929 *tail = '\0'; /* Terminate dir portion */ 1930 ret = create_dir(a, a->name); 1931 if (ret == ARCHIVE_OK && chdir(a->name) != 0) 1932 ret = ARCHIVE_FAILED; 1933 *tail = '/'; /* Restore the / we removed. */ 1934 if (ret != ARCHIVE_OK) 1935 return; 1936 tail++; 1937 /* The chdir() succeeded; we've now shortened the path. */ 1938 a->name = tail; 1939 } 1940 return; 1941} 1942#endif 1943 1944/* 1945 * The main restore function. 1946 */ 1947static int 1948restore_entry(struct archive_write_disk *a) 1949{ 1950 int ret = ARCHIVE_OK, en; 1951 1952 if (a->flags & ARCHIVE_EXTRACT_UNLINK && !S_ISDIR(a->mode)) { 1953 /* 1954 * TODO: Fix this. Apparently, there are platforms 1955 * that still allow root to hose the entire filesystem 1956 * by unlinking a dir. The S_ISDIR() test above 1957 * prevents us from using unlink() here if the new 1958 * object is a dir, but that doesn't mean the old 1959 * object isn't a dir. 1960 */ 1961 if (a->flags & ARCHIVE_EXTRACT_CLEAR_NOCHANGE_FFLAGS) 1962 (void)clear_nochange_fflags(a); 1963 if (unlink(a->name) == 0) { 1964 /* We removed it, reset cached stat. */ 1965 a->pst = NULL; 1966 } else if (errno == ENOENT) { 1967 /* File didn't exist, that's just as good. */ 1968 } else if (rmdir(a->name) == 0) { 1969 /* It was a dir, but now it's gone. */ 1970 a->pst = NULL; 1971 } else { 1972 /* We tried, but couldn't get rid of it. */ 1973 archive_set_error(&a->archive, errno, 1974 "Could not unlink"); 1975 return(ARCHIVE_FAILED); 1976 } 1977 } 1978 1979 /* Try creating it first; if this fails, we'll try to recover. */ 1980 en = create_filesystem_object(a); 1981 1982 if ((en == ENOTDIR || en == ENOENT) 1983 && !(a->flags & ARCHIVE_EXTRACT_NO_AUTODIR)) { 1984 /* If the parent dir doesn't exist, try creating it. */ 1985 create_parent_dir(a, a->name); 1986 /* Now try to create the object again. */ 1987 en = create_filesystem_object(a); 1988 } 1989 1990 if ((en == ENOENT) && (archive_entry_hardlink(a->entry) != NULL)) { 1991 archive_set_error(&a->archive, en, 1992 "Hard-link target '%s' does not exist.", 1993 archive_entry_hardlink(a->entry)); 1994 return (ARCHIVE_FAILED); 1995 } 1996 1997 if ((en == EISDIR || en == EEXIST) 1998 && (a->flags & ARCHIVE_EXTRACT_NO_OVERWRITE)) { 1999 /* If we're not overwriting, we're done. */ 2000 if (S_ISDIR(a->mode)) { 2001 /* Don't overwrite any settings on existing directories. */ 2002 a->todo = 0; 2003 } 2004 archive_entry_unset_size(a->entry); 2005 return (ARCHIVE_OK); 2006 } 2007 2008 /* 2009 * Some platforms return EISDIR if you call 2010 * open(O_WRONLY | O_EXCL | O_CREAT) on a directory, some 2011 * return EEXIST. POSIX is ambiguous, requiring EISDIR 2012 * for open(O_WRONLY) on a dir and EEXIST for open(O_EXCL | O_CREAT) 2013 * on an existing item. 2014 */ 2015 if (en == EISDIR) { 2016 /* A dir is in the way of a non-dir, rmdir it. */ 2017 if (rmdir(a->name) != 0) { 2018 archive_set_error(&a->archive, errno, 2019 "Can't remove already-existing dir"); 2020 return (ARCHIVE_FAILED); 2021 } 2022 a->pst = NULL; 2023 /* Try again. */ 2024 en = create_filesystem_object(a); 2025 } else if (en == EEXIST) { 2026 /* 2027 * We know something is in the way, but we don't know what; 2028 * we need to find out before we go any further. 2029 */ 2030 int r = 0; 2031 /* 2032 * The SECURE_SYMLINKS logic has already removed a 2033 * symlink to a dir if the client wants that. So 2034 * follow the symlink if we're creating a dir. 2035 */ 2036 if (S_ISDIR(a->mode)) 2037 r = stat(a->name, &a->st); 2038 /* 2039 * If it's not a dir (or it's a broken symlink), 2040 * then don't follow it. 2041 */ 2042 if (r != 0 || !S_ISDIR(a->mode)) 2043 r = lstat(a->name, &a->st); 2044 if (r != 0) { 2045 archive_set_error(&a->archive, errno, 2046 "Can't stat existing object"); 2047 return (ARCHIVE_FAILED); 2048 } 2049 2050 /* 2051 * NO_OVERWRITE_NEWER doesn't apply to directories. 2052 */ 2053 if ((a->flags & ARCHIVE_EXTRACT_NO_OVERWRITE_NEWER) 2054 && !S_ISDIR(a->st.st_mode)) { 2055 if (!older(&(a->st), a->entry)) { 2056 archive_entry_unset_size(a->entry); 2057 return (ARCHIVE_OK); 2058 } 2059 } 2060 2061 /* If it's our archive, we're done. */ 2062 if (a->skip_file_set && 2063 a->st.st_dev == (dev_t)a->skip_file_dev && 2064 a->st.st_ino == (ino_t)a->skip_file_ino) { 2065 archive_set_error(&a->archive, 0, 2066 "Refusing to overwrite archive"); 2067 return (ARCHIVE_FAILED); 2068 } 2069 2070 if (!S_ISDIR(a->st.st_mode)) { 2071 /* A non-dir is in the way, unlink it. */ 2072 if (a->flags & ARCHIVE_EXTRACT_CLEAR_NOCHANGE_FFLAGS) 2073 (void)clear_nochange_fflags(a); 2074 if (unlink(a->name) != 0) { 2075 archive_set_error(&a->archive, errno, 2076 "Can't unlink already-existing object"); 2077 return (ARCHIVE_FAILED); 2078 } 2079 a->pst = NULL; 2080 /* Try again. */ 2081 en = create_filesystem_object(a); 2082 } else if (!S_ISDIR(a->mode)) { 2083 /* A dir is in the way of a non-dir, rmdir it. */ 2084 if (a->flags & ARCHIVE_EXTRACT_CLEAR_NOCHANGE_FFLAGS) 2085 (void)clear_nochange_fflags(a); 2086 if (rmdir(a->name) != 0) { 2087 archive_set_error(&a->archive, errno, 2088 "Can't replace existing directory with non-directory"); 2089 return (ARCHIVE_FAILED); 2090 } 2091 /* Try again. */ 2092 en = create_filesystem_object(a); 2093 } else { 2094 /* 2095 * There's a dir in the way of a dir. Don't 2096 * waste time with rmdir()/mkdir(), just fix 2097 * up the permissions on the existing dir. 2098 * Note that we don't change perms on existing 2099 * dirs unless _EXTRACT_PERM is specified. 2100 */ 2101 if ((a->mode != a->st.st_mode) 2102 && (a->todo & TODO_MODE_FORCE)) 2103 a->deferred |= (a->todo & TODO_MODE); 2104 /* Ownership doesn't need deferred fixup. */ 2105 en = 0; /* Forget the EEXIST. */ 2106 } 2107 } 2108 2109 if (en) { 2110 /* Everything failed; give up here. */ 2111 if ((&a->archive)->error == NULL) 2112 archive_set_error(&a->archive, en, "Can't create '%s'", 2113 a->name); 2114 return (ARCHIVE_FAILED); 2115 } 2116 2117 a->pst = NULL; /* Cached stat data no longer valid. */ 2118 return (ret); 2119} 2120 2121/* 2122 * Returns 0 if creation succeeds, or else returns errno value from 2123 * the failed system call. Note: This function should only ever perform 2124 * a single system call. 2125 */ 2126static int 2127create_filesystem_object(struct archive_write_disk *a) 2128{ 2129 /* Create the entry. */ 2130 const char *linkname; 2131 mode_t final_mode, mode; 2132 int r; 2133 /* these for check_symlinks_fsobj */ 2134 char *linkname_copy; /* non-const copy of linkname */ 2135 struct stat st; 2136 struct archive_string error_string; 2137 int error_number; 2138 2139 /* We identify hard/symlinks according to the link names. */ 2140 /* Since link(2) and symlink(2) don't handle modes, we're done here. */ 2141 linkname = archive_entry_hardlink(a->entry); 2142 if (linkname != NULL) { 2143#if !HAVE_LINK 2144 return (EPERM); 2145#else 2146 archive_string_init(&error_string); 2147 linkname_copy = strdup(linkname); 2148 if (linkname_copy == NULL) { 2149 return (EPERM); 2150 } 2151 /* 2152 * TODO: consider using the cleaned-up path as the link 2153 * target? 2154 */ 2155 r = cleanup_pathname_fsobj(linkname_copy, &error_number, 2156 &error_string, a->flags); 2157 if (r != ARCHIVE_OK) { 2158 archive_set_error(&a->archive, error_number, "%s", 2159 error_string.s); 2160 free(linkname_copy); 2161 archive_string_free(&error_string); 2162 /* 2163 * EPERM is more appropriate than error_number for our 2164 * callers 2165 */ 2166 return (EPERM); 2167 } 2168 r = check_symlinks_fsobj(linkname_copy, &error_number, 2169 &error_string, a->flags); 2170 if (r != ARCHIVE_OK) { 2171 archive_set_error(&a->archive, error_number, "%s", 2172 error_string.s); 2173 free(linkname_copy); 2174 archive_string_free(&error_string); 2175 /* 2176 * EPERM is more appropriate than error_number for our 2177 * callers 2178 */ 2179 return (EPERM); 2180 } 2181 free(linkname_copy); 2182 archive_string_free(&error_string); 2183 r = link(linkname, a->name) ? errno : 0; 2184 /* 2185 * New cpio and pax formats allow hardlink entries 2186 * to carry data, so we may have to open the file 2187 * for hardlink entries. 2188 * 2189 * If the hardlink was successfully created and 2190 * the archive doesn't have carry data for it, 2191 * consider it to be non-authoritative for meta data. 2192 * This is consistent with GNU tar and BSD pax. 2193 * If the hardlink does carry data, let the last 2194 * archive entry decide ownership. 2195 */ 2196 if (r == 0 && a->filesize <= 0) { 2197 a->todo = 0; 2198 a->deferred = 0; 2199 } else if (r == 0 && a->filesize > 0) { 2200#ifdef HAVE_LSTAT 2201 r = lstat(a->name, &st); 2202#else 2203 r = stat(a->name, &st); 2204#endif 2205 if (r != 0) 2206 r = errno; 2207 else if ((st.st_mode & AE_IFMT) == AE_IFREG) { 2208 a->fd = open(a->name, O_WRONLY | O_TRUNC | 2209 O_BINARY | O_CLOEXEC | O_NOFOLLOW); 2210 __archive_ensure_cloexec_flag(a->fd); 2211 if (a->fd < 0) 2212 r = errno; 2213 } 2214 } 2215 return (r); 2216#endif 2217 } 2218 linkname = archive_entry_symlink(a->entry); 2219 if (linkname != NULL) { 2220#if HAVE_SYMLINK 2221 return symlink(linkname, a->name) ? errno : 0; 2222#else 2223 return (EPERM); 2224#endif 2225 } 2226 2227 /* 2228 * The remaining system calls all set permissions, so let's 2229 * try to take advantage of that to avoid an extra chmod() 2230 * call. (Recall that umask is set to zero right now!) 2231 */ 2232 2233 /* Mode we want for the final restored object (w/o file type bits). */ 2234 final_mode = a->mode & 07777; 2235 /* 2236 * The mode that will actually be restored in this step. Note 2237 * that SUID, SGID, etc, require additional work to ensure 2238 * security, so we never restore them at this point. 2239 */ 2240 mode = final_mode & 0777 & ~a->user_umask; 2241 2242 /* 2243 * Always create writable such that [f]setxattr() works if we're not 2244 * root. 2245 */ 2246 if (a->user_uid != 0 && 2247 a->todo & (TODO_HFS_COMPRESSION | TODO_XATTR)) { 2248 mode |= 0200; 2249 } 2250 2251 switch (a->mode & AE_IFMT) { 2252 default: 2253 /* POSIX requires that we fall through here. */ 2254 /* FALLTHROUGH */ 2255 case AE_IFREG: 2256 a->fd = open(a->name, 2257 O_WRONLY | O_CREAT | O_EXCL | O_BINARY | O_CLOEXEC, mode); 2258 __archive_ensure_cloexec_flag(a->fd); 2259 r = (a->fd < 0); 2260 break; 2261 case AE_IFCHR: 2262#ifdef HAVE_MKNOD 2263 /* Note: we use AE_IFCHR for the case label, and 2264 * S_IFCHR for the mknod() call. This is correct. */ 2265 r = mknod(a->name, mode | S_IFCHR, 2266 archive_entry_rdev(a->entry)); 2267 break; 2268#else 2269 /* TODO: Find a better way to warn about our inability 2270 * to restore a char device node. */ 2271 return (EINVAL); 2272#endif /* HAVE_MKNOD */ 2273 case AE_IFBLK: 2274#ifdef HAVE_MKNOD 2275 r = mknod(a->name, mode | S_IFBLK, 2276 archive_entry_rdev(a->entry)); 2277 break; 2278#else 2279 /* TODO: Find a better way to warn about our inability 2280 * to restore a block device node. */ 2281 return (EINVAL); 2282#endif /* HAVE_MKNOD */ 2283 case AE_IFDIR: 2284 mode = (mode | MINIMUM_DIR_MODE) & MAXIMUM_DIR_MODE; 2285 r = mkdir(a->name, mode); 2286 if (r == 0) { 2287 /* Defer setting dir times. */ 2288 a->deferred |= (a->todo & TODO_TIMES); 2289 a->todo &= ~TODO_TIMES; 2290 /* Never use an immediate chmod(). */ 2291 /* We can't avoid the chmod() entirely if EXTRACT_PERM 2292 * because of SysV SGID inheritance. */ 2293 if ((mode != final_mode) 2294 || (a->flags & ARCHIVE_EXTRACT_PERM)) 2295 a->deferred |= (a->todo & TODO_MODE); 2296 a->todo &= ~TODO_MODE; 2297 } 2298 break; 2299 case AE_IFIFO: 2300#ifdef HAVE_MKFIFO 2301 r = mkfifo(a->name, mode); 2302 break; 2303#else 2304 /* TODO: Find a better way to warn about our inability 2305 * to restore a fifo. */ 2306 return (EINVAL); 2307#endif /* HAVE_MKFIFO */ 2308 } 2309 2310 /* All the system calls above set errno on failure. */ 2311 if (r) 2312 return (errno); 2313 2314 /* If we managed to set the final mode, we've avoided a chmod(). */ 2315 if (mode == final_mode) 2316 a->todo &= ~TODO_MODE; 2317 return (0); 2318} 2319 2320/* 2321 * Cleanup function for archive_extract. Mostly, this involves processing 2322 * the fixup list, which is used to address a number of problems: 2323 * * Dir permissions might prevent us from restoring a file in that 2324 * dir, so we restore the dir with minimum 0700 permissions first, 2325 * then correct the mode at the end. 2326 * * Similarly, the act of restoring a file touches the directory 2327 * and changes the timestamp on the dir, so we have to touch-up dir 2328 * timestamps at the end as well. 2329 * * Some file flags can interfere with the restore by, for example, 2330 * preventing the creation of hardlinks to those files. 2331 * * Mac OS extended metadata includes ACLs, so must be deferred on dirs. 2332 * 2333 * Note that tar/cpio do not require that archives be in a particular 2334 * order; there is no way to know when the last file has been restored 2335 * within a directory, so there's no way to optimize the memory usage 2336 * here by fixing up the directory any earlier than the 2337 * end-of-archive. 2338 * 2339 * XXX TODO: Directory ACLs should be restored here, for the same 2340 * reason we set directory perms here. XXX 2341 */ 2342static int 2343_archive_write_disk_close(struct archive *_a) 2344{ 2345 struct archive_write_disk *a = (struct archive_write_disk *)_a; 2346 struct fixup_entry *next, *p; 2347 int ret; 2348 2349 archive_check_magic(&a->archive, ARCHIVE_WRITE_DISK_MAGIC, 2350 ARCHIVE_STATE_HEADER | ARCHIVE_STATE_DATA, 2351 "archive_write_disk_close"); 2352 ret = _archive_write_disk_finish_entry(&a->archive); 2353 2354 /* Sort dir list so directories are fixed up in depth-first order. */ 2355 p = sort_dir_list(a->fixup_list); 2356 2357 while (p != NULL) { 2358 a->pst = NULL; /* Mark stat cache as out-of-date. */ 2359 if (p->fixup & TODO_TIMES) { 2360 set_times(a, -1, p->mode, p->name, 2361 p->atime, p->atime_nanos, 2362 p->birthtime, p->birthtime_nanos, 2363 p->mtime, p->mtime_nanos, 2364 p->ctime, p->ctime_nanos); 2365 } 2366 if (p->fixup & TODO_MODE_BASE) 2367 chmod(p->name, p->mode); 2368 if (p->fixup & TODO_ACLS) 2369 archive_write_disk_set_acls(&a->archive, -1, p->name, 2370 &p->acl, p->mode); 2371 if (p->fixup & TODO_FFLAGS) 2372 set_fflags_platform(a, -1, p->name, 2373 p->mode, p->fflags_set, 0); 2374 if (p->fixup & TODO_MAC_METADATA) 2375 set_mac_metadata(a, p->name, p->mac_metadata, 2376 p->mac_metadata_size); 2377 next = p->next; 2378 archive_acl_clear(&p->acl); 2379 free(p->mac_metadata); 2380 free(p->name); 2381 free(p); 2382 p = next; 2383 } 2384 a->fixup_list = NULL; 2385 return (ret); 2386} 2387 2388static int 2389_archive_write_disk_free(struct archive *_a) 2390{ 2391 struct archive_write_disk *a; 2392 int ret; 2393 if (_a == NULL) 2394 return (ARCHIVE_OK); 2395 archive_check_magic(_a, ARCHIVE_WRITE_DISK_MAGIC, 2396 ARCHIVE_STATE_ANY | ARCHIVE_STATE_FATAL, "archive_write_disk_free"); 2397 a = (struct archive_write_disk *)_a; 2398 ret = _archive_write_disk_close(&a->archive); 2399 archive_write_disk_set_group_lookup(&a->archive, NULL, NULL, NULL); 2400 archive_write_disk_set_user_lookup(&a->archive, NULL, NULL, NULL); 2401 if (a->entry) 2402 archive_entry_free(a->entry); 2403 archive_string_free(&a->_name_data); 2404 archive_string_free(&a->archive.error_string); 2405 archive_string_free(&a->path_safe); 2406 a->archive.magic = 0; 2407 __archive_clean(&a->archive); 2408 free(a->decmpfs_header_p); 2409 free(a->resource_fork); 2410 free(a->compressed_buffer); 2411 free(a->uncompressed_buffer); 2412#if defined(__APPLE__) && defined(UF_COMPRESSED) && defined(HAVE_SYS_XATTR_H)\ 2413 && defined(HAVE_ZLIB_H) 2414 if (a->stream_valid) { 2415 switch (deflateEnd(&a->stream)) { 2416 case Z_OK: 2417 break; 2418 default: 2419 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 2420 "Failed to clean up compressor"); 2421 ret = ARCHIVE_FATAL; 2422 break; 2423 } 2424 } 2425#endif 2426 free(a); 2427 return (ret); 2428} 2429 2430/* 2431 * Simple O(n log n) merge sort to order the fixup list. In 2432 * particular, we want to restore dir timestamps depth-first. 2433 */ 2434static struct fixup_entry * 2435sort_dir_list(struct fixup_entry *p) 2436{ 2437 struct fixup_entry *a, *b, *t; 2438 2439 if (p == NULL) 2440 return (NULL); 2441 /* A one-item list is already sorted. */ 2442 if (p->next == NULL) 2443 return (p); 2444 2445 /* Step 1: split the list. */ 2446 t = p; 2447 a = p->next->next; 2448 while (a != NULL) { 2449 /* Step a twice, t once. */ 2450 a = a->next; 2451 if (a != NULL) 2452 a = a->next; 2453 t = t->next; 2454 } 2455 /* Now, t is at the mid-point, so break the list here. */ 2456 b = t->next; 2457 t->next = NULL; 2458 a = p; 2459 2460 /* Step 2: Recursively sort the two sub-lists. */ 2461 a = sort_dir_list(a); 2462 b = sort_dir_list(b); 2463 2464 /* Step 3: Merge the returned lists. */ 2465 /* Pick the first element for the merged list. */ 2466 if (strcmp(a->name, b->name) > 0) { 2467 t = p = a; 2468 a = a->next; 2469 } else { 2470 t = p = b; 2471 b = b->next; 2472 } 2473 2474 /* Always put the later element on the list first. */ 2475 while (a != NULL && b != NULL) { 2476 if (strcmp(a->name, b->name) > 0) { 2477 t->next = a; 2478 a = a->next; 2479 } else { 2480 t->next = b; 2481 b = b->next; 2482 } 2483 t = t->next; 2484 } 2485 2486 /* Only one list is non-empty, so just splice it on. */ 2487 if (a != NULL) 2488 t->next = a; 2489 if (b != NULL) 2490 t->next = b; 2491 2492 return (p); 2493} 2494 2495/* 2496 * Returns a new, initialized fixup entry. 2497 * 2498 * TODO: Reduce the memory requirements for this list by using a tree 2499 * structure rather than a simple list of names. 2500 */ 2501static struct fixup_entry * 2502new_fixup(struct archive_write_disk *a, const char *pathname) 2503{ 2504 struct fixup_entry *fe; 2505 2506 fe = (struct fixup_entry *)calloc(1, sizeof(struct fixup_entry)); 2507 if (fe == NULL) { 2508 archive_set_error(&a->archive, ENOMEM, 2509 "Can't allocate memory for a fixup"); 2510 return (NULL); 2511 } 2512 fe->next = a->fixup_list; 2513 a->fixup_list = fe; 2514 fe->fixup = 0; 2515 fe->name = strdup(pathname); 2516 return (fe); 2517} 2518 2519/* 2520 * Returns a fixup structure for the current entry. 2521 */ 2522static struct fixup_entry * 2523current_fixup(struct archive_write_disk *a, const char *pathname) 2524{ 2525 if (a->current_fixup == NULL) 2526 a->current_fixup = new_fixup(a, pathname); 2527 return (a->current_fixup); 2528} 2529 2530/* Error helper for new *_fsobj functions */ 2531static void 2532fsobj_error(int *a_eno, struct archive_string *a_estr, 2533 int err, const char *errstr, const char *path) 2534{ 2535 if (a_eno) 2536 *a_eno = err; 2537 if (a_estr) 2538 archive_string_sprintf(a_estr, "%s%s", errstr, path); 2539} 2540 2541/* 2542 * TODO: Someday, integrate this with the deep dir support; they both 2543 * scan the path and both can be optimized by comparing against other 2544 * recent paths. 2545 */ 2546/* TODO: Extend this to support symlinks on Windows Vista and later. */ 2547 2548/* 2549 * Checks the given path to see if any elements along it are symlinks. Returns 2550 * ARCHIVE_OK if there are none, otherwise puts an error in errmsg. 2551 */ 2552static int 2553check_symlinks_fsobj(char *path, int *a_eno, struct archive_string *a_estr, 2554 int flags) 2555{ 2556#if !defined(HAVE_LSTAT) 2557 /* Platform doesn't have lstat, so we can't look for symlinks. */ 2558 (void)path; /* UNUSED */ 2559 (void)error_number; /* UNUSED */ 2560 (void)error_string; /* UNUSED */ 2561 (void)flags; /* UNUSED */ 2562 return (ARCHIVE_OK); 2563#else 2564 int res = ARCHIVE_OK; 2565 char *tail; 2566 char *head; 2567 int last; 2568 char c; 2569 int r; 2570 struct stat st; 2571 int restore_pwd; 2572 2573 /* Nothing to do here if name is empty */ 2574 if(path[0] == '\0') 2575 return (ARCHIVE_OK); 2576 2577 /* 2578 * Guard against symlink tricks. Reject any archive entry whose 2579 * destination would be altered by a symlink. 2580 * 2581 * Walk the filename in chunks separated by '/'. For each segment: 2582 * - if it doesn't exist, continue 2583 * - if it's symlink, abort or remove it 2584 * - if it's a directory and it's not the last chunk, cd into it 2585 * As we go: 2586 * head points to the current (relative) path 2587 * tail points to the temporary \0 terminating the segment we're 2588 * currently examining 2589 * c holds what used to be in *tail 2590 * last is 1 if this is the last tail 2591 */ 2592 restore_pwd = open(".", O_RDONLY | O_BINARY | O_CLOEXEC); 2593 __archive_ensure_cloexec_flag(restore_pwd); 2594 if (restore_pwd < 0) 2595 return (ARCHIVE_FATAL); 2596 head = path; 2597 tail = path; 2598 last = 0; 2599 /* TODO: reintroduce a safe cache here? */ 2600 /* Skip the root directory if the path is absolute. */ 2601 if(tail == path && tail[0] == '/') 2602 ++tail; 2603 /* Keep going until we've checked the entire name. 2604 * head, tail, path all alias the same string, which is 2605 * temporarily zeroed at tail, so be careful restoring the 2606 * stashed (c=tail[0]) for error messages. 2607 * Exiting the loop with break is okay; continue is not. 2608 */ 2609 while (!last) { 2610 /* 2611 * Skip the separator we just consumed, plus any adjacent ones 2612 */ 2613 while (*tail == '/') 2614 ++tail; 2615 /* Skip the next path element. */ 2616 while (*tail != '\0' && *tail != '/') 2617 ++tail; 2618 /* is this the last path component? */ 2619 last = (tail[0] == '\0') || (tail[0] == '/' && tail[1] == '\0'); 2620 /* temporarily truncate the string here */ 2621 c = tail[0]; 2622 tail[0] = '\0'; 2623 /* Check that we haven't hit a symlink. */ 2624 r = lstat(head, &st); 2625 if (r != 0) { 2626 tail[0] = c; 2627 /* We've hit a dir that doesn't exist; stop now. */ 2628 if (errno == ENOENT) { 2629 break; 2630 } else { 2631 /* 2632 * Treat any other error as fatal - best to be 2633 * paranoid here. 2634 * Note: This effectively disables deep 2635 * directory support when security checks are 2636 * enabled. Otherwise, very long pathnames that 2637 * trigger an error here could evade the 2638 * sandbox. 2639 * TODO: We could do better, but it would 2640 * probably require merging the symlink checks 2641 * with the deep-directory editing. 2642 */ 2643 fsobj_error(a_eno, a_estr, errno, 2644 "Could not stat ", path); 2645 res = ARCHIVE_FAILED; 2646 break; 2647 } 2648 } else if (S_ISDIR(st.st_mode)) { 2649 if (!last) { 2650 if (chdir(head) != 0) { 2651 tail[0] = c; 2652 fsobj_error(a_eno, a_estr, errno, 2653 "Could not chdir ", path); 2654 res = (ARCHIVE_FATAL); 2655 break; 2656 } 2657 /* Our view is now from inside this dir: */ 2658 head = tail + 1; 2659 } 2660 } else if (S_ISLNK(st.st_mode)) { 2661 if (last) { 2662 /* 2663 * Last element is symlink; remove it 2664 * so we can overwrite it with the 2665 * item being extracted. 2666 */ 2667 if (unlink(head)) { 2668 tail[0] = c; 2669 fsobj_error(a_eno, a_estr, errno, 2670 "Could not remove symlink ", 2671 path); 2672 res = ARCHIVE_FAILED; 2673 break; 2674 } 2675 /* 2676 * Even if we did remove it, a warning 2677 * is in order. The warning is silly, 2678 * though, if we're just replacing one 2679 * symlink with another symlink. 2680 */ 2681 tail[0] = c; 2682 /* 2683 * FIXME: not sure how important this is to 2684 * restore 2685 */ 2686 /* 2687 if (!S_ISLNK(path)) { 2688 fsobj_error(a_eno, a_estr, 0, 2689 "Removing symlink ", path); 2690 } 2691 */ 2692 /* Symlink gone. No more problem! */ 2693 res = ARCHIVE_OK; 2694 break; 2695 } else if (flags & ARCHIVE_EXTRACT_UNLINK) { 2696 /* User asked us to remove problems. */ 2697 if (unlink(head) != 0) { 2698 tail[0] = c; 2699 fsobj_error(a_eno, a_estr, 0, 2700 "Cannot remove intervening " 2701 "symlink ", path); 2702 res = ARCHIVE_FAILED; 2703 break; 2704 } 2705 tail[0] = c; 2706 } else if ((flags & 2707 ARCHIVE_EXTRACT_SECURE_SYMLINKS) == 0) { 2708 /* 2709 * We are not the last element and we want to 2710 * follow symlinks if they are a directory. 2711 * 2712 * This is needed to extract hardlinks over 2713 * symlinks. 2714 */ 2715 r = stat(head, &st); 2716 if (r != 0) { 2717 tail[0] = c; 2718 if (errno == ENOENT) { 2719 break; 2720 } else { 2721 fsobj_error(a_eno, a_estr, 2722 errno, 2723 "Could not stat ", path); 2724 res = (ARCHIVE_FAILED); 2725 break; 2726 } 2727 } else if (S_ISDIR(st.st_mode)) { 2728 if (chdir(head) != 0) { 2729 tail[0] = c; 2730 fsobj_error(a_eno, a_estr, 2731 errno, 2732 "Could not chdir ", path); 2733 res = (ARCHIVE_FATAL); 2734 break; 2735 } 2736 /* 2737 * Our view is now from inside 2738 * this dir: 2739 */ 2740 head = tail + 1; 2741 } else { 2742 tail[0] = c; 2743 fsobj_error(a_eno, a_estr, 0, 2744 "Cannot extract through " 2745 "symlink ", path); 2746 res = ARCHIVE_FAILED; 2747 break; 2748 } 2749 } else { 2750 tail[0] = c; 2751 fsobj_error(a_eno, a_estr, 0, 2752 "Cannot extract through symlink ", path); 2753 res = ARCHIVE_FAILED; 2754 break; 2755 } 2756 } 2757 /* be sure to always maintain this */ 2758 tail[0] = c; 2759 if (tail[0] != '\0') 2760 tail++; /* Advance to the next segment. */ 2761 } 2762 /* Catches loop exits via break */ 2763 tail[0] = c; 2764#ifdef HAVE_FCHDIR 2765 /* If we changed directory above, restore it here. */ 2766 if (restore_pwd >= 0) { 2767 r = fchdir(restore_pwd); 2768 if (r != 0) { 2769 fsobj_error(a_eno, a_estr, errno, 2770 "chdir() failure", ""); 2771 } 2772 close(restore_pwd); 2773 restore_pwd = -1; 2774 if (r != 0) { 2775 res = (ARCHIVE_FATAL); 2776 } 2777 } 2778#endif 2779 /* TODO: reintroduce a safe cache here? */ 2780 return res; 2781#endif 2782} 2783 2784/* 2785 * Check a->name for symlinks, returning ARCHIVE_OK if its clean, otherwise 2786 * calls archive_set_error and returns ARCHIVE_{FATAL,FAILED} 2787 */ 2788static int 2789check_symlinks(struct archive_write_disk *a) 2790{ 2791 struct archive_string error_string; 2792 int error_number; 2793 int rc; 2794 archive_string_init(&error_string); 2795 rc = check_symlinks_fsobj(a->name, &error_number, &error_string, 2796 a->flags); 2797 if (rc != ARCHIVE_OK) { 2798 archive_set_error(&a->archive, error_number, "%s", 2799 error_string.s); 2800 } 2801 archive_string_free(&error_string); 2802 a->pst = NULL; /* to be safe */ 2803 return rc; 2804} 2805 2806 2807#if defined(__CYGWIN__) 2808/* 2809 * 1. Convert a path separator from '\' to '/' . 2810 * We shouldn't check multibyte character directly because some 2811 * character-set have been using the '\' character for a part of 2812 * its multibyte character code. 2813 * 2. Replace unusable characters in Windows with underscore('_'). 2814 * See also : http://msdn.microsoft.com/en-us/library/aa365247.aspx 2815 */ 2816static void 2817cleanup_pathname_win(char *path) 2818{ 2819 wchar_t wc; 2820 char *p; 2821 size_t alen, l; 2822 int mb, complete, utf8; 2823 2824 alen = 0; 2825 mb = 0; 2826 complete = 1; 2827 utf8 = (strcmp(nl_langinfo(CODESET), "UTF-8") == 0)? 1: 0; 2828 for (p = path; *p != '\0'; p++) { 2829 ++alen; 2830 if (*p == '\\') { 2831 /* If previous byte is smaller than 128, 2832 * this is not second byte of multibyte characters, 2833 * so we can replace '\' with '/'. */ 2834 if (utf8 || !mb) 2835 *p = '/'; 2836 else 2837 complete = 0;/* uncompleted. */ 2838 } else if (*(unsigned char *)p > 127) 2839 mb = 1; 2840 else 2841 mb = 0; 2842 /* Rewrite the path name if its next character is unusable. */ 2843 if (*p == ':' || *p == '*' || *p == '?' || *p == '"' || 2844 *p == '<' || *p == '>' || *p == '|') 2845 *p = '_'; 2846 } 2847 if (complete) 2848 return; 2849 2850 /* 2851 * Convert path separator in wide-character. 2852 */ 2853 p = path; 2854 while (*p != '\0' && alen) { 2855 l = mbtowc(&wc, p, alen); 2856 if (l == (size_t)-1) { 2857 while (*p != '\0') { 2858 if (*p == '\\') 2859 *p = '/'; 2860 ++p; 2861 } 2862 break; 2863 } 2864 if (l == 1 && wc == L'\\') 2865 *p = '/'; 2866 p += l; 2867 alen -= l; 2868 } 2869} 2870#endif 2871 2872/* 2873 * Canonicalize the pathname. In particular, this strips duplicate 2874 * '/' characters, '.' elements, and trailing '/'. It also raises an 2875 * error for an empty path, a trailing '..', (if _SECURE_NODOTDOT is 2876 * set) any '..' in the path or (if ARCHIVE_EXTRACT_SECURE_NOABSOLUTEPATHS 2877 * is set) if the path is absolute. 2878 */ 2879static int 2880cleanup_pathname_fsobj(char *path, int *a_eno, struct archive_string *a_estr, 2881 int flags) 2882{ 2883 char *dest, *src; 2884 char separator = '\0'; 2885 2886 dest = src = path; 2887 if (*src == '\0') { 2888 fsobj_error(a_eno, a_estr, ARCHIVE_ERRNO_MISC, 2889 "Invalid empty ", "pathname"); 2890 return (ARCHIVE_FAILED); 2891 } 2892 2893#if defined(__CYGWIN__) 2894 cleanup_pathname_win(path); 2895#endif 2896 /* Skip leading '/'. */ 2897 if (*src == '/') { 2898 if (flags & ARCHIVE_EXTRACT_SECURE_NOABSOLUTEPATHS) { 2899 fsobj_error(a_eno, a_estr, ARCHIVE_ERRNO_MISC, 2900 "Path is ", "absolute"); 2901 return (ARCHIVE_FAILED); 2902 } 2903 2904 separator = *src++; 2905 } 2906 2907 /* Scan the pathname one element at a time. */ 2908 for (;;) { 2909 /* src points to first char after '/' */ 2910 if (src[0] == '\0') { 2911 break; 2912 } else if (src[0] == '/') { 2913 /* Found '//', ignore second one. */ 2914 src++; 2915 continue; 2916 } else if (src[0] == '.') { 2917 if (src[1] == '\0') { 2918 /* Ignore trailing '.' */ 2919 break; 2920 } else if (src[1] == '/') { 2921 /* Skip './'. */ 2922 src += 2; 2923 continue; 2924 } else if (src[1] == '.') { 2925 if (src[2] == '/' || src[2] == '\0') { 2926 /* Conditionally warn about '..' */ 2927 if (flags 2928 & ARCHIVE_EXTRACT_SECURE_NODOTDOT) { 2929 fsobj_error(a_eno, a_estr, 2930 ARCHIVE_ERRNO_MISC, 2931 "Path contains ", "'..'"); 2932 return (ARCHIVE_FAILED); 2933 } 2934 } 2935 /* 2936 * Note: Under no circumstances do we 2937 * remove '..' elements. In 2938 * particular, restoring 2939 * '/foo/../bar/' should create the 2940 * 'foo' dir as a side-effect. 2941 */ 2942 } 2943 } 2944 2945 /* Copy current element, including leading '/'. */ 2946 if (separator) 2947 *dest++ = '/'; 2948 while (*src != '\0' && *src != '/') { 2949 *dest++ = *src++; 2950 } 2951 2952 if (*src == '\0') 2953 break; 2954 2955 /* Skip '/' separator. */ 2956 separator = *src++; 2957 } 2958 /* 2959 * We've just copied zero or more path elements, not including the 2960 * final '/'. 2961 */ 2962 if (dest == path) { 2963 /* 2964 * Nothing got copied. The path must have been something 2965 * like '.' or '/' or './' or '/././././/./'. 2966 */ 2967 if (separator) 2968 *dest++ = '/'; 2969 else 2970 *dest++ = '.'; 2971 } 2972 /* Terminate the result. */ 2973 *dest = '\0'; 2974 return (ARCHIVE_OK); 2975} 2976 2977static int 2978cleanup_pathname(struct archive_write_disk *a) 2979{ 2980 struct archive_string error_string; 2981 int error_number; 2982 int rc; 2983 archive_string_init(&error_string); 2984 rc = cleanup_pathname_fsobj(a->name, &error_number, &error_string, 2985 a->flags); 2986 if (rc != ARCHIVE_OK) { 2987 archive_set_error(&a->archive, error_number, "%s", 2988 error_string.s); 2989 } 2990 archive_string_free(&error_string); 2991 return rc; 2992} 2993 2994/* 2995 * Create the parent directory of the specified path, assuming path 2996 * is already in mutable storage. 2997 */ 2998static int 2999create_parent_dir(struct archive_write_disk *a, char *path) 3000{ 3001 char *slash; 3002 int r; 3003 3004 /* Remove tail element to obtain parent name. */ 3005 slash = strrchr(path, '/'); 3006 if (slash == NULL) 3007 return (ARCHIVE_OK); 3008 *slash = '\0'; 3009 r = create_dir(a, path); 3010 *slash = '/'; 3011 return (r); 3012} 3013 3014/* 3015 * Create the specified dir, recursing to create parents as necessary. 3016 * 3017 * Returns ARCHIVE_OK if the path exists when we're done here. 3018 * Otherwise, returns ARCHIVE_FAILED. 3019 * Assumes path is in mutable storage; path is unchanged on exit. 3020 */ 3021static int 3022create_dir(struct archive_write_disk *a, char *path) 3023{ 3024 struct stat st; 3025 struct fixup_entry *le; 3026 char *slash, *base; 3027 mode_t mode_final, mode; 3028 int r; 3029 3030 /* Check for special names and just skip them. */ 3031 slash = strrchr(path, '/'); 3032 if (slash == NULL) 3033 base = path; 3034 else 3035 base = slash + 1; 3036 3037 if (base[0] == '\0' || 3038 (base[0] == '.' && base[1] == '\0') || 3039 (base[0] == '.' && base[1] == '.' && base[2] == '\0')) { 3040 /* Don't bother trying to create null path, '.', or '..'. */ 3041 if (slash != NULL) { 3042 *slash = '\0'; 3043 r = create_dir(a, path); 3044 *slash = '/'; 3045 return (r); 3046 } 3047 return (ARCHIVE_OK); 3048 } 3049 3050 /* 3051 * Yes, this should be stat() and not lstat(). Using lstat() 3052 * here loses the ability to extract through symlinks. Also note 3053 * that this should not use the a->st cache. 3054 */ 3055 if (stat(path, &st) == 0) { 3056 if (S_ISDIR(st.st_mode)) 3057 return (ARCHIVE_OK); 3058 if ((a->flags & ARCHIVE_EXTRACT_NO_OVERWRITE)) { 3059 archive_set_error(&a->archive, EEXIST, 3060 "Can't create directory '%s'", path); 3061 return (ARCHIVE_FAILED); 3062 } 3063 if (unlink(path) != 0) { 3064 archive_set_error(&a->archive, errno, 3065 "Can't create directory '%s': " 3066 "Conflicting file cannot be removed", 3067 path); 3068 return (ARCHIVE_FAILED); 3069 } 3070 } else if (errno != ENOENT && errno != ENOTDIR) { 3071 /* Stat failed? */ 3072 archive_set_error(&a->archive, errno, 3073 "Can't test directory '%s'", path); 3074 return (ARCHIVE_FAILED); 3075 } else if (slash != NULL) { 3076 *slash = '\0'; 3077 r = create_dir(a, path); 3078 *slash = '/'; 3079 if (r != ARCHIVE_OK) 3080 return (r); 3081 } 3082 3083 /* 3084 * Mode we want for the final restored directory. Per POSIX, 3085 * implicitly-created dirs must be created obeying the umask. 3086 * There's no mention whether this is different for privileged 3087 * restores (which the rest of this code handles by pretending 3088 * umask=0). I've chosen here to always obey the user's umask for 3089 * implicit dirs, even if _EXTRACT_PERM was specified. 3090 */ 3091 mode_final = DEFAULT_DIR_MODE & ~a->user_umask; 3092 /* Mode we want on disk during the restore process. */ 3093 mode = mode_final; 3094 mode |= MINIMUM_DIR_MODE; 3095 mode &= MAXIMUM_DIR_MODE; 3096 if (mkdir(path, mode) == 0) { 3097 if (mode != mode_final) { 3098 le = new_fixup(a, path); 3099 if (le == NULL) 3100 return (ARCHIVE_FATAL); 3101 le->fixup |=TODO_MODE_BASE; 3102 le->mode = mode_final; 3103 } 3104 return (ARCHIVE_OK); 3105 } 3106 3107 /* 3108 * Without the following check, a/b/../b/c/d fails at the 3109 * second visit to 'b', so 'd' can't be created. Note that we 3110 * don't add it to the fixup list here, as it's already been 3111 * added. 3112 */ 3113 if (stat(path, &st) == 0 && S_ISDIR(st.st_mode)) 3114 return (ARCHIVE_OK); 3115 3116 archive_set_error(&a->archive, errno, "Failed to create dir '%s'", 3117 path); 3118 return (ARCHIVE_FAILED); 3119} 3120 3121/* 3122 * Note: Although we can skip setting the user id if the desired user 3123 * id matches the current user, we cannot skip setting the group, as 3124 * many systems set the gid based on the containing directory. So 3125 * we have to perform a chown syscall if we want to set the SGID 3126 * bit. (The alternative is to stat() and then possibly chown(); it's 3127 * more efficient to skip the stat() and just always chown().) Note 3128 * that a successful chown() here clears the TODO_SGID_CHECK bit, which 3129 * allows set_mode to skip the stat() check for the GID. 3130 */ 3131static int 3132set_ownership(struct archive_write_disk *a) 3133{ 3134#ifndef __CYGWIN__ 3135/* unfortunately, on win32 there is no 'root' user with uid 0, 3136 so we just have to try the chown and see if it works */ 3137 3138 /* If we know we can't change it, don't bother trying. */ 3139 if (a->user_uid != 0 && a->user_uid != a->uid) { 3140 archive_set_error(&a->archive, errno, 3141 "Can't set UID=%jd", (intmax_t)a->uid); 3142 return (ARCHIVE_WARN); 3143 } 3144#endif 3145 3146#ifdef HAVE_FCHOWN 3147 /* If we have an fd, we can avoid a race. */ 3148 if (a->fd >= 0 && fchown(a->fd, a->uid, a->gid) == 0) { 3149 /* We've set owner and know uid/gid are correct. */ 3150 a->todo &= ~(TODO_OWNER | TODO_SGID_CHECK | TODO_SUID_CHECK); 3151 return (ARCHIVE_OK); 3152 } 3153#endif 3154 3155 /* We prefer lchown() but will use chown() if that's all we have. */ 3156 /* Of course, if we have neither, this will always fail. */ 3157#ifdef HAVE_LCHOWN 3158 if (lchown(a->name, a->uid, a->gid) == 0) { 3159 /* We've set owner and know uid/gid are correct. */ 3160 a->todo &= ~(TODO_OWNER | TODO_SGID_CHECK | TODO_SUID_CHECK); 3161 return (ARCHIVE_OK); 3162 } 3163#elif HAVE_CHOWN 3164 if (!S_ISLNK(a->mode) && chown(a->name, a->uid, a->gid) == 0) { 3165 /* We've set owner and know uid/gid are correct. */ 3166 a->todo &= ~(TODO_OWNER | TODO_SGID_CHECK | TODO_SUID_CHECK); 3167 return (ARCHIVE_OK); 3168 } 3169#endif 3170 3171 archive_set_error(&a->archive, errno, 3172 "Can't set user=%jd/group=%jd for %s", 3173 (intmax_t)a->uid, (intmax_t)a->gid, a->name); 3174 return (ARCHIVE_WARN); 3175} 3176 3177/* 3178 * Note: Returns 0 on success, non-zero on failure. 3179 */ 3180static int 3181set_time(int fd, int mode, const char *name, 3182 time_t atime, long atime_nsec, 3183 time_t mtime, long mtime_nsec) 3184{ 3185 /* Select the best implementation for this platform. */ 3186#if defined(HAVE_UTIMENSAT) && defined(HAVE_FUTIMENS) 3187 /* 3188 * utimensat() and futimens() are defined in 3189 * POSIX.1-2008. They support ns resolution and setting times 3190 * on fds and symlinks. 3191 */ 3192 struct timespec ts[2]; 3193 (void)mode; /* UNUSED */ 3194 ts[0].tv_sec = atime; 3195 ts[0].tv_nsec = atime_nsec; 3196 ts[1].tv_sec = mtime; 3197 ts[1].tv_nsec = mtime_nsec; 3198 if (fd >= 0) 3199 return futimens(fd, ts); 3200 return utimensat(AT_FDCWD, name, ts, AT_SYMLINK_NOFOLLOW); 3201 3202#elif HAVE_UTIMES 3203 /* 3204 * The utimes()-family functions support ��s-resolution and 3205 * setting times fds and symlinks. utimes() is documented as 3206 * LEGACY by POSIX, futimes() and lutimes() are not described 3207 * in POSIX. 3208 */ 3209 struct timeval times[2]; 3210 3211 times[0].tv_sec = atime; 3212 times[0].tv_usec = atime_nsec / 1000; 3213 times[1].tv_sec = mtime; 3214 times[1].tv_usec = mtime_nsec / 1000; 3215 3216#ifdef HAVE_FUTIMES 3217 if (fd >= 0) 3218 return (futimes(fd, times)); 3219#else 3220 (void)fd; /* UNUSED */ 3221#endif 3222#ifdef HAVE_LUTIMES 3223 (void)mode; /* UNUSED */ 3224 return (lutimes(name, times)); 3225#else 3226 if (S_ISLNK(mode)) 3227 return (0); 3228 return (utimes(name, times)); 3229#endif 3230 3231#elif defined(HAVE_UTIME) 3232 /* 3233 * utime() is POSIX-standard but only supports 1s resolution and 3234 * does not support fds or symlinks. 3235 */ 3236 struct utimbuf times; 3237 (void)fd; /* UNUSED */ 3238 (void)name; /* UNUSED */ 3239 (void)atime_nsec; /* UNUSED */ 3240 (void)mtime_nsec; /* UNUSED */ 3241 times.actime = atime; 3242 times.modtime = mtime; 3243 if (S_ISLNK(mode)) 3244 return (ARCHIVE_OK); 3245 return (utime(name, ×)); 3246 3247#else 3248 /* 3249 * We don't know how to set the time on this platform. 3250 */ 3251 (void)fd; /* UNUSED */ 3252 (void)mode; /* UNUSED */ 3253 (void)name; /* UNUSED */ 3254 (void)atime_nsec; /* UNUSED */ 3255 (void)mtime_nsec; /* UNUSED */ 3256 return (ARCHIVE_WARN); 3257#endif 3258} 3259 3260#ifdef F_SETTIMES 3261static int 3262set_time_tru64(int fd, int mode, const char *name, 3263 time_t atime, long atime_nsec, 3264 time_t mtime, long mtime_nsec, 3265 time_t ctime, long ctime_nsec) 3266{ 3267 struct attr_timbuf tstamp; 3268 tstamp.atime.tv_sec = atime; 3269 tstamp.mtime.tv_sec = mtime; 3270 tstamp.ctime.tv_sec = ctime; 3271#if defined (__hpux) && defined (__ia64) 3272 tstamp.atime.tv_nsec = atime_nsec; 3273 tstamp.mtime.tv_nsec = mtime_nsec; 3274 tstamp.ctime.tv_nsec = ctime_nsec; 3275#else 3276 tstamp.atime.tv_usec = atime_nsec / 1000; 3277 tstamp.mtime.tv_usec = mtime_nsec / 1000; 3278 tstamp.ctime.tv_usec = ctime_nsec / 1000; 3279#endif 3280 return (fcntl(fd,F_SETTIMES,&tstamp)); 3281} 3282#endif /* F_SETTIMES */ 3283 3284static int 3285set_times(struct archive_write_disk *a, 3286 int fd, int mode, const char *name, 3287 time_t atime, long atime_nanos, 3288 time_t birthtime, long birthtime_nanos, 3289 time_t mtime, long mtime_nanos, 3290 time_t cctime, long ctime_nanos) 3291{ 3292 /* Note: set_time doesn't use libarchive return conventions! 3293 * It uses syscall conventions. So 0 here instead of ARCHIVE_OK. */ 3294 int r1 = 0, r2 = 0; 3295 3296#ifdef F_SETTIMES 3297 /* 3298 * on Tru64 try own fcntl first which can restore even the 3299 * ctime, fall back to default code path below if it fails 3300 * or if we are not running as root 3301 */ 3302 if (a->user_uid == 0 && 3303 set_time_tru64(fd, mode, name, 3304 atime, atime_nanos, mtime, 3305 mtime_nanos, cctime, ctime_nanos) == 0) { 3306 return (ARCHIVE_OK); 3307 } 3308#else /* Tru64 */ 3309 (void)cctime; /* UNUSED */ 3310 (void)ctime_nanos; /* UNUSED */ 3311#endif /* Tru64 */ 3312 3313#ifdef HAVE_STRUCT_STAT_ST_BIRTHTIME 3314 /* 3315 * If you have struct stat.st_birthtime, we assume BSD 3316 * birthtime semantics, in which {f,l,}utimes() updates 3317 * birthtime to earliest mtime. So we set the time twice, 3318 * first using the birthtime, then using the mtime. If 3319 * birthtime == mtime, this isn't necessary, so we skip it. 3320 * If birthtime > mtime, then this won't work, so we skip it. 3321 */ 3322 if (birthtime < mtime 3323 || (birthtime == mtime && birthtime_nanos < mtime_nanos)) 3324 r1 = set_time(fd, mode, name, 3325 atime, atime_nanos, 3326 birthtime, birthtime_nanos); 3327#else 3328 (void)birthtime; /* UNUSED */ 3329 (void)birthtime_nanos; /* UNUSED */ 3330#endif 3331 r2 = set_time(fd, mode, name, 3332 atime, atime_nanos, 3333 mtime, mtime_nanos); 3334 if (r1 != 0 || r2 != 0) { 3335 archive_set_error(&a->archive, errno, 3336 "Can't restore time"); 3337 return (ARCHIVE_WARN); 3338 } 3339 return (ARCHIVE_OK); 3340} 3341 3342static int 3343set_times_from_entry(struct archive_write_disk *a) 3344{ 3345 time_t atime, birthtime, mtime, cctime; 3346 long atime_nsec, birthtime_nsec, mtime_nsec, ctime_nsec; 3347 3348 /* Suitable defaults. */ 3349 atime = birthtime = mtime = cctime = a->start_time; 3350 atime_nsec = birthtime_nsec = mtime_nsec = ctime_nsec = 0; 3351 3352 /* If no time was provided, we're done. */ 3353 if (!archive_entry_atime_is_set(a->entry) 3354#if HAVE_STRUCT_STAT_ST_BIRTHTIME 3355 && !archive_entry_birthtime_is_set(a->entry) 3356#endif 3357 && !archive_entry_mtime_is_set(a->entry)) 3358 return (ARCHIVE_OK); 3359 3360 if (archive_entry_atime_is_set(a->entry)) { 3361 atime = archive_entry_atime(a->entry); 3362 atime_nsec = archive_entry_atime_nsec(a->entry); 3363 } 3364 if (archive_entry_birthtime_is_set(a->entry)) { 3365 birthtime = archive_entry_birthtime(a->entry); 3366 birthtime_nsec = archive_entry_birthtime_nsec(a->entry); 3367 } 3368 if (archive_entry_mtime_is_set(a->entry)) { 3369 mtime = archive_entry_mtime(a->entry); 3370 mtime_nsec = archive_entry_mtime_nsec(a->entry); 3371 } 3372 if (archive_entry_ctime_is_set(a->entry)) { 3373 cctime = archive_entry_ctime(a->entry); 3374 ctime_nsec = archive_entry_ctime_nsec(a->entry); 3375 } 3376 3377 return set_times(a, a->fd, a->mode, a->name, 3378 atime, atime_nsec, 3379 birthtime, birthtime_nsec, 3380 mtime, mtime_nsec, 3381 cctime, ctime_nsec); 3382} 3383 3384static int 3385set_mode(struct archive_write_disk *a, int mode) 3386{ 3387 int r = ARCHIVE_OK; 3388 mode &= 07777; /* Strip off file type bits. */ 3389 3390 if (a->todo & TODO_SGID_CHECK) { 3391 /* 3392 * If we don't know the GID is right, we must stat() 3393 * to verify it. We can't just check the GID of this 3394 * process, since systems sometimes set GID from 3395 * the enclosing dir or based on ACLs. 3396 */ 3397 if ((r = lazy_stat(a)) != ARCHIVE_OK) 3398 return (r); 3399 if (a->pst->st_gid != a->gid) { 3400 mode &= ~ S_ISGID; 3401 if (a->flags & ARCHIVE_EXTRACT_OWNER) { 3402 /* 3403 * This is only an error if you 3404 * requested owner restore. If you 3405 * didn't, we'll try to restore 3406 * sgid/suid, but won't consider it a 3407 * problem if we can't. 3408 */ 3409 archive_set_error(&a->archive, -1, 3410 "Can't restore SGID bit"); 3411 r = ARCHIVE_WARN; 3412 } 3413 } 3414 /* While we're here, double-check the UID. */ 3415 if (a->pst->st_uid != a->uid 3416 && (a->todo & TODO_SUID)) { 3417 mode &= ~ S_ISUID; 3418 if (a->flags & ARCHIVE_EXTRACT_OWNER) { 3419 archive_set_error(&a->archive, -1, 3420 "Can't restore SUID bit"); 3421 r = ARCHIVE_WARN; 3422 } 3423 } 3424 a->todo &= ~TODO_SGID_CHECK; 3425 a->todo &= ~TODO_SUID_CHECK; 3426 } else if (a->todo & TODO_SUID_CHECK) { 3427 /* 3428 * If we don't know the UID is right, we can just check 3429 * the user, since all systems set the file UID from 3430 * the process UID. 3431 */ 3432 if (a->user_uid != a->uid) { 3433 mode &= ~ S_ISUID; 3434 if (a->flags & ARCHIVE_EXTRACT_OWNER) { 3435 archive_set_error(&a->archive, -1, 3436 "Can't make file SUID"); 3437 r = ARCHIVE_WARN; 3438 } 3439 } 3440 a->todo &= ~TODO_SUID_CHECK; 3441 } 3442 3443 if (S_ISLNK(a->mode)) { 3444#ifdef HAVE_LCHMOD 3445 /* 3446 * If this is a symlink, use lchmod(). If the 3447 * platform doesn't support lchmod(), just skip it. A 3448 * platform that doesn't provide a way to set 3449 * permissions on symlinks probably ignores 3450 * permissions on symlinks, so a failure here has no 3451 * impact. 3452 */ 3453 if (lchmod(a->name, mode) != 0) { 3454 switch (errno) { 3455 case ENOTSUP: 3456 case ENOSYS: 3457#if ENOTSUP != EOPNOTSUPP 3458 case EOPNOTSUPP: 3459#endif 3460 /* 3461 * if lchmod is defined but the platform 3462 * doesn't support it, silently ignore 3463 * error 3464 */ 3465 break; 3466 default: 3467 archive_set_error(&a->archive, errno, 3468 "Can't set permissions to 0%o", (int)mode); 3469 r = ARCHIVE_WARN; 3470 } 3471 } 3472#endif 3473 } else if (!S_ISDIR(a->mode)) { 3474 /* 3475 * If it's not a symlink and not a dir, then use 3476 * fchmod() or chmod(), depending on whether we have 3477 * an fd. Dirs get their perms set during the 3478 * post-extract fixup, which is handled elsewhere. 3479 */ 3480#ifdef HAVE_FCHMOD 3481 if (a->fd >= 0) { 3482 if (fchmod(a->fd, mode) != 0) { 3483 archive_set_error(&a->archive, errno, 3484 "Can't set permissions to 0%o", (int)mode); 3485 r = ARCHIVE_WARN; 3486 } 3487 } else 3488#endif 3489 /* If this platform lacks fchmod(), then 3490 * we'll just use chmod(). */ 3491 if (chmod(a->name, mode) != 0) { 3492 archive_set_error(&a->archive, errno, 3493 "Can't set permissions to 0%o", (int)mode); 3494 r = ARCHIVE_WARN; 3495 } 3496 } 3497 return (r); 3498} 3499 3500static int 3501set_fflags(struct archive_write_disk *a) 3502{ 3503 struct fixup_entry *le; 3504 unsigned long set, clear; 3505 int r; 3506 int critical_flags; 3507 mode_t mode = archive_entry_mode(a->entry); 3508 3509 /* 3510 * Make 'critical_flags' hold all file flags that can't be 3511 * immediately restored. For example, on BSD systems, 3512 * SF_IMMUTABLE prevents hardlinks from being created, so 3513 * should not be set until after any hardlinks are created. To 3514 * preserve some semblance of portability, this uses #ifdef 3515 * extensively. Ugly, but it works. 3516 * 3517 * Yes, Virginia, this does create a security race. It's mitigated 3518 * somewhat by the practice of creating dirs 0700 until the extract 3519 * is done, but it would be nice if we could do more than that. 3520 * People restoring critical file systems should be wary of 3521 * other programs that might try to muck with files as they're 3522 * being restored. 3523 */ 3524 /* Hopefully, the compiler will optimize this mess into a constant. */ 3525 critical_flags = 0; 3526#ifdef SF_IMMUTABLE 3527 critical_flags |= SF_IMMUTABLE; 3528#endif 3529#ifdef UF_IMMUTABLE 3530 critical_flags |= UF_IMMUTABLE; 3531#endif 3532#ifdef SF_APPEND 3533 critical_flags |= SF_APPEND; 3534#endif 3535#ifdef UF_APPEND 3536 critical_flags |= UF_APPEND; 3537#endif 3538#if defined(FS_APPEND_FL) 3539 critical_flags |= FS_APPEND_FL; 3540#elif defined(EXT2_APPEND_FL) 3541 critical_flags |= EXT2_APPEND_FL; 3542#endif 3543#if defined(FS_IMMUTABLE_FL) 3544 critical_flags |= FS_IMMUTABLE_FL; 3545#elif defined(EXT2_IMMUTABLE_FL) 3546 critical_flags |= EXT2_IMMUTABLE_FL; 3547#endif 3548#ifdef FS_JOURNAL_DATA_FL 3549 critical_flags |= FS_JOURNAL_DATA_FL; 3550#endif 3551 3552 if (a->todo & TODO_FFLAGS) { 3553 archive_entry_fflags(a->entry, &set, &clear); 3554 3555 /* 3556 * The first test encourages the compiler to eliminate 3557 * all of this if it's not necessary. 3558 */ 3559 if ((critical_flags != 0) && (set & critical_flags)) { 3560 le = current_fixup(a, a->name); 3561 if (le == NULL) 3562 return (ARCHIVE_FATAL); 3563 le->fixup |= TODO_FFLAGS; 3564 le->fflags_set = set; 3565 /* Store the mode if it's not already there. */ 3566 if ((le->fixup & TODO_MODE) == 0) 3567 le->mode = mode; 3568 } else { 3569 r = set_fflags_platform(a, a->fd, 3570 a->name, mode, set, clear); 3571 if (r != ARCHIVE_OK) 3572 return (r); 3573 } 3574 } 3575 return (ARCHIVE_OK); 3576} 3577 3578static int 3579clear_nochange_fflags(struct archive_write_disk *a) 3580{ 3581 int nochange_flags; 3582 mode_t mode = archive_entry_mode(a->entry); 3583 3584 /* Hopefully, the compiler will optimize this mess into a constant. */ 3585 nochange_flags = 0; 3586#ifdef SF_IMMUTABLE 3587 nochange_flags |= SF_IMMUTABLE; 3588#endif 3589#ifdef UF_IMMUTABLE 3590 nochange_flags |= UF_IMMUTABLE; 3591#endif 3592#ifdef SF_APPEND 3593 nochange_flags |= SF_APPEND; 3594#endif 3595#ifdef UF_APPEND 3596 nochange_flags |= UF_APPEND; 3597#endif 3598#ifdef EXT2_APPEND_FL 3599 nochange_flags |= EXT2_APPEND_FL; 3600#endif 3601#ifdef EXT2_IMMUTABLE_FL 3602 nochange_flags |= EXT2_IMMUTABLE_FL; 3603#endif 3604 3605 return (set_fflags_platform(a, a->fd, a->name, mode, 0, 3606 nochange_flags)); 3607} 3608 3609 3610#if ( defined(HAVE_LCHFLAGS) || defined(HAVE_CHFLAGS) || defined(HAVE_FCHFLAGS) ) && defined(HAVE_STRUCT_STAT_ST_FLAGS) 3611/* 3612 * BSD reads flags using stat() and sets them with one of {f,l,}chflags() 3613 */ 3614static int 3615set_fflags_platform(struct archive_write_disk *a, int fd, const char *name, 3616 mode_t mode, unsigned long set, unsigned long clear) 3617{ 3618 int r; 3619 3620 (void)mode; /* UNUSED */ 3621 if (set == 0 && clear == 0) 3622 return (ARCHIVE_OK); 3623 3624 /* 3625 * XXX Is the stat here really necessary? Or can I just use 3626 * the 'set' flags directly? In particular, I'm not sure 3627 * about the correct approach if we're overwriting an existing 3628 * file that already has flags on it. XXX 3629 */ 3630 if ((r = lazy_stat(a)) != ARCHIVE_OK) 3631 return (r); 3632 3633 a->st.st_flags &= ~clear; 3634 a->st.st_flags |= set; 3635#ifdef HAVE_FCHFLAGS 3636 /* If platform has fchflags() and we were given an fd, use it. */ 3637 if (fd >= 0 && fchflags(fd, a->st.st_flags) == 0) 3638 return (ARCHIVE_OK); 3639#endif 3640 /* 3641 * If we can't use the fd to set the flags, we'll use the 3642 * pathname to set flags. We prefer lchflags() but will use 3643 * chflags() if we must. 3644 */ 3645#ifdef HAVE_LCHFLAGS 3646 if (lchflags(name, a->st.st_flags) == 0) 3647 return (ARCHIVE_OK); 3648#elif defined(HAVE_CHFLAGS) 3649 if (S_ISLNK(a->st.st_mode)) { 3650 archive_set_error(&a->archive, errno, 3651 "Can't set file flags on symlink."); 3652 return (ARCHIVE_WARN); 3653 } 3654 if (chflags(name, a->st.st_flags) == 0) 3655 return (ARCHIVE_OK); 3656#endif 3657 archive_set_error(&a->archive, errno, 3658 "Failed to set file flags"); 3659 return (ARCHIVE_WARN); 3660} 3661 3662#elif (defined(FS_IOC_GETFLAGS) && defined(FS_IOC_SETFLAGS) && \ 3663 defined(HAVE_WORKING_FS_IOC_GETFLAGS)) || \ 3664 (defined(EXT2_IOC_GETFLAGS) && defined(EXT2_IOC_SETFLAGS) && \ 3665 defined(HAVE_WORKING_EXT2_IOC_GETFLAGS)) 3666/* 3667 * Linux uses ioctl() to read and write file flags. 3668 */ 3669static int 3670set_fflags_platform(struct archive_write_disk *a, int fd, const char *name, 3671 mode_t mode, unsigned long set, unsigned long clear) 3672{ 3673 int ret; 3674 int myfd = fd; 3675 int newflags, oldflags; 3676 int sf_mask = 0; 3677 3678 if (set == 0 && clear == 0) 3679 return (ARCHIVE_OK); 3680 /* Only regular files and dirs can have flags. */ 3681 if (!S_ISREG(mode) && !S_ISDIR(mode)) 3682 return (ARCHIVE_OK); 3683 3684 /* If we weren't given an fd, open it ourselves. */ 3685 if (myfd < 0) { 3686 myfd = open(name, O_RDONLY | O_NONBLOCK | O_BINARY | O_CLOEXEC); 3687 __archive_ensure_cloexec_flag(myfd); 3688 } 3689 if (myfd < 0) 3690 return (ARCHIVE_OK); 3691 3692 /* 3693 * Linux has no define for the flags that are only settable by 3694 * the root user. This code may seem a little complex, but 3695 * there seem to be some Linux systems that lack these 3696 * defines. (?) The code below degrades reasonably gracefully 3697 * if sf_mask is incomplete. 3698 */ 3699#if defined(FS_IMMUTABLE_FL) 3700 sf_mask |= FS_IMMUTABLE_FL; 3701#elif defined(EXT2_IMMUTABLE_FL) 3702 sf_mask |= EXT2_IMMUTABLE_FL; 3703#endif 3704#if defined(FS_APPEND_FL) 3705 sf_mask |= FS_APPEND_FL; 3706#elif defined(EXT2_APPEND_FL) 3707 sf_mask |= EXT2_APPEND_FL; 3708#endif 3709#if defined(FS_JOURNAL_DATA_FL) 3710 sf_mask |= FS_JOURNAL_DATA_FL; 3711#endif 3712 /* 3713 * XXX As above, this would be way simpler if we didn't have 3714 * to read the current flags from disk. XXX 3715 */ 3716 ret = ARCHIVE_OK; 3717 3718 /* Read the current file flags. */ 3719 if (ioctl(myfd, 3720#ifdef FS_IOC_GETFLAGS 3721 FS_IOC_GETFLAGS, 3722#else 3723 EXT2_IOC_GETFLAGS, 3724#endif 3725 &oldflags) < 0) 3726 goto fail; 3727 3728 /* Try setting the flags as given. */ 3729 newflags = (oldflags & ~clear) | set; 3730 if (ioctl(myfd, 3731#ifdef FS_IOC_SETFLAGS 3732 FS_IOC_SETFLAGS, 3733#else 3734 EXT2_IOC_SETFLAGS, 3735#endif 3736 &newflags) >= 0) 3737 goto cleanup; 3738 if (errno != EPERM) 3739 goto fail; 3740 3741 /* If we couldn't set all the flags, try again with a subset. */ 3742 newflags &= ~sf_mask; 3743 oldflags &= sf_mask; 3744 newflags |= oldflags; 3745 if (ioctl(myfd, 3746#ifdef FS_IOC_SETFLAGS 3747 FS_IOC_SETFLAGS, 3748#else 3749 EXT2_IOC_SETFLAGS, 3750#endif 3751 &newflags) >= 0) 3752 goto cleanup; 3753 3754 /* We couldn't set the flags, so report the failure. */ 3755fail: 3756 archive_set_error(&a->archive, errno, 3757 "Failed to set file flags"); 3758 ret = ARCHIVE_WARN; 3759cleanup: 3760 if (fd < 0) 3761 close(myfd); 3762 return (ret); 3763} 3764 3765#else 3766 3767/* 3768 * Of course, some systems have neither BSD chflags() nor Linux' flags 3769 * support through ioctl(). 3770 */ 3771static int 3772set_fflags_platform(struct archive_write_disk *a, int fd, const char *name, 3773 mode_t mode, unsigned long set, unsigned long clear) 3774{ 3775 (void)a; /* UNUSED */ 3776 (void)fd; /* UNUSED */ 3777 (void)name; /* UNUSED */ 3778 (void)mode; /* UNUSED */ 3779 (void)set; /* UNUSED */ 3780 (void)clear; /* UNUSED */ 3781 return (ARCHIVE_OK); 3782} 3783 3784#endif /* __linux */ 3785 3786#ifndef HAVE_COPYFILE_H 3787/* Default is to simply drop Mac extended metadata. */ 3788static int 3789set_mac_metadata(struct archive_write_disk *a, const char *pathname, 3790 const void *metadata, size_t metadata_size) 3791{ 3792 (void)a; /* UNUSED */ 3793 (void)pathname; /* UNUSED */ 3794 (void)metadata; /* UNUSED */ 3795 (void)metadata_size; /* UNUSED */ 3796 return (ARCHIVE_OK); 3797} 3798 3799static int 3800fixup_appledouble(struct archive_write_disk *a, const char *pathname) 3801{ 3802 (void)a; /* UNUSED */ 3803 (void)pathname; /* UNUSED */ 3804 return (ARCHIVE_OK); 3805} 3806#else 3807 3808/* 3809 * On Mac OS, we use copyfile() to unpack the metadata and 3810 * apply it to the target file. 3811 */ 3812 3813#if defined(HAVE_SYS_XATTR_H) 3814static int 3815copy_xattrs(struct archive_write_disk *a, int tmpfd, int dffd) 3816{ 3817 ssize_t xattr_size; 3818 char *xattr_names = NULL, *xattr_val = NULL; 3819 int ret = ARCHIVE_OK, xattr_i; 3820 3821 xattr_size = flistxattr(tmpfd, NULL, 0, 0); 3822 if (xattr_size == -1) { 3823 archive_set_error(&a->archive, errno, 3824 "Failed to read metadata(xattr)"); 3825 ret = ARCHIVE_WARN; 3826 goto exit_xattr; 3827 } 3828 xattr_names = malloc(xattr_size); 3829 if (xattr_names == NULL) { 3830 archive_set_error(&a->archive, ENOMEM, 3831 "Can't allocate memory for metadata(xattr)"); 3832 ret = ARCHIVE_FATAL; 3833 goto exit_xattr; 3834 } 3835 xattr_size = flistxattr(tmpfd, xattr_names, xattr_size, 0); 3836 if (xattr_size == -1) { 3837 archive_set_error(&a->archive, errno, 3838 "Failed to read metadata(xattr)"); 3839 ret = ARCHIVE_WARN; 3840 goto exit_xattr; 3841 } 3842 for (xattr_i = 0; xattr_i < xattr_size; 3843 xattr_i += strlen(xattr_names + xattr_i) + 1) { 3844 char *xattr_val_saved; 3845 ssize_t s; 3846 int f; 3847 3848 s = fgetxattr(tmpfd, xattr_names + xattr_i, NULL, 0, 0, 0); 3849 if (s == -1) { 3850 archive_set_error(&a->archive, errno, 3851 "Failed to get metadata(xattr)"); 3852 ret = ARCHIVE_WARN; 3853 goto exit_xattr; 3854 } 3855 xattr_val_saved = xattr_val; 3856 xattr_val = realloc(xattr_val, s); 3857 if (xattr_val == NULL) { 3858 archive_set_error(&a->archive, ENOMEM, 3859 "Failed to get metadata(xattr)"); 3860 ret = ARCHIVE_WARN; 3861 free(xattr_val_saved); 3862 goto exit_xattr; 3863 } 3864 s = fgetxattr(tmpfd, xattr_names + xattr_i, xattr_val, s, 0, 0); 3865 if (s == -1) { 3866 archive_set_error(&a->archive, errno, 3867 "Failed to get metadata(xattr)"); 3868 ret = ARCHIVE_WARN; 3869 goto exit_xattr; 3870 } 3871 f = fsetxattr(dffd, xattr_names + xattr_i, xattr_val, s, 0, 0); 3872 if (f == -1) { 3873 archive_set_error(&a->archive, errno, 3874 "Failed to get metadata(xattr)"); 3875 ret = ARCHIVE_WARN; 3876 goto exit_xattr; 3877 } 3878 } 3879exit_xattr: 3880 free(xattr_names); 3881 free(xattr_val); 3882 return (ret); 3883} 3884#endif 3885 3886static int 3887copy_acls(struct archive_write_disk *a, int tmpfd, int dffd) 3888{ 3889#ifndef HAVE_SYS_ACL_H 3890 return 0; 3891#else 3892 acl_t acl, dfacl = NULL; 3893 int acl_r, ret = ARCHIVE_OK; 3894 3895 acl = acl_get_fd(tmpfd); 3896 if (acl == NULL) { 3897 if (errno == ENOENT) 3898 /* There are not any ACLs. */ 3899 return (ret); 3900 archive_set_error(&a->archive, errno, 3901 "Failed to get metadata(acl)"); 3902 ret = ARCHIVE_WARN; 3903 goto exit_acl; 3904 } 3905 dfacl = acl_dup(acl); 3906 acl_r = acl_set_fd(dffd, dfacl); 3907 if (acl_r == -1) { 3908 archive_set_error(&a->archive, errno, 3909 "Failed to get metadata(acl)"); 3910 ret = ARCHIVE_WARN; 3911 goto exit_acl; 3912 } 3913exit_acl: 3914 if (acl) 3915 acl_free(acl); 3916 if (dfacl) 3917 acl_free(dfacl); 3918 return (ret); 3919#endif 3920} 3921 3922static int 3923create_tempdatafork(struct archive_write_disk *a, const char *pathname) 3924{ 3925 struct archive_string tmpdatafork; 3926 int tmpfd; 3927 3928 archive_string_init(&tmpdatafork); 3929 archive_strcpy(&tmpdatafork, "tar.md.XXXXXX"); 3930 tmpfd = mkstemp(tmpdatafork.s); 3931 if (tmpfd < 0) { 3932 archive_set_error(&a->archive, errno, 3933 "Failed to mkstemp"); 3934 archive_string_free(&tmpdatafork); 3935 return (-1); 3936 } 3937 if (copyfile(pathname, tmpdatafork.s, 0, 3938 COPYFILE_UNPACK | COPYFILE_NOFOLLOW 3939 | COPYFILE_ACL | COPYFILE_XATTR) < 0) { 3940 archive_set_error(&a->archive, errno, 3941 "Failed to restore metadata"); 3942 close(tmpfd); 3943 tmpfd = -1; 3944 } 3945 unlink(tmpdatafork.s); 3946 archive_string_free(&tmpdatafork); 3947 return (tmpfd); 3948} 3949 3950static int 3951copy_metadata(struct archive_write_disk *a, const char *metadata, 3952 const char *datafork, int datafork_compressed) 3953{ 3954 int ret = ARCHIVE_OK; 3955 3956 if (datafork_compressed) { 3957 int dffd, tmpfd; 3958 3959 tmpfd = create_tempdatafork(a, metadata); 3960 if (tmpfd == -1) 3961 return (ARCHIVE_WARN); 3962 3963 /* 3964 * Do not open the data fork compressed by HFS+ compression 3965 * with at least a writing mode(O_RDWR or O_WRONLY). it 3966 * makes the data fork uncompressed. 3967 */ 3968 dffd = open(datafork, 0); 3969 if (dffd == -1) { 3970 archive_set_error(&a->archive, errno, 3971 "Failed to open the data fork for metadata"); 3972 close(tmpfd); 3973 return (ARCHIVE_WARN); 3974 } 3975 3976#if defined(HAVE_SYS_XATTR_H) 3977 ret = copy_xattrs(a, tmpfd, dffd); 3978 if (ret == ARCHIVE_OK) 3979#endif 3980 ret = copy_acls(a, tmpfd, dffd); 3981 close(tmpfd); 3982 close(dffd); 3983 } else { 3984 if (copyfile(metadata, datafork, 0, 3985 COPYFILE_UNPACK | COPYFILE_NOFOLLOW 3986 | COPYFILE_ACL | COPYFILE_XATTR) < 0) { 3987 archive_set_error(&a->archive, errno, 3988 "Failed to restore metadata"); 3989 ret = ARCHIVE_WARN; 3990 } 3991 } 3992 return (ret); 3993} 3994 3995static int 3996set_mac_metadata(struct archive_write_disk *a, const char *pathname, 3997 const void *metadata, size_t metadata_size) 3998{ 3999 struct archive_string tmp; 4000 ssize_t written; 4001 int fd; 4002 int ret = ARCHIVE_OK; 4003 4004 /* This would be simpler if copyfile() could just accept the 4005 * metadata as a block of memory; then we could sidestep this 4006 * silly dance of writing the data to disk just so that 4007 * copyfile() can read it back in again. */ 4008 archive_string_init(&tmp); 4009 archive_strcpy(&tmp, pathname); 4010 archive_strcat(&tmp, ".XXXXXX"); 4011 fd = mkstemp(tmp.s); 4012 4013 if (fd < 0) { 4014 archive_set_error(&a->archive, errno, 4015 "Failed to restore metadata"); 4016 archive_string_free(&tmp); 4017 return (ARCHIVE_WARN); 4018 } 4019 written = write(fd, metadata, metadata_size); 4020 close(fd); 4021 if ((size_t)written != metadata_size) { 4022 archive_set_error(&a->archive, errno, 4023 "Failed to restore metadata"); 4024 ret = ARCHIVE_WARN; 4025 } else { 4026 int compressed; 4027 4028#if defined(UF_COMPRESSED) 4029 if ((a->todo & TODO_HFS_COMPRESSION) != 0 && 4030 (ret = lazy_stat(a)) == ARCHIVE_OK) 4031 compressed = a->st.st_flags & UF_COMPRESSED; 4032 else 4033#endif 4034 compressed = 0; 4035 ret = copy_metadata(a, tmp.s, pathname, compressed); 4036 } 4037 unlink(tmp.s); 4038 archive_string_free(&tmp); 4039 return (ret); 4040} 4041 4042static int 4043fixup_appledouble(struct archive_write_disk *a, const char *pathname) 4044{ 4045 char buff[8]; 4046 struct stat st; 4047 const char *p; 4048 struct archive_string datafork; 4049 int fd = -1, ret = ARCHIVE_OK; 4050 4051 archive_string_init(&datafork); 4052 /* Check if the current file name is a type of the resource 4053 * fork file. */ 4054 p = strrchr(pathname, '/'); 4055 if (p == NULL) 4056 p = pathname; 4057 else 4058 p++; 4059 if (p[0] != '.' || p[1] != '_') 4060 goto skip_appledouble; 4061 4062 /* 4063 * Check if the data fork file exists. 4064 * 4065 * TODO: Check if this write disk object has handled it. 4066 */ 4067 archive_strncpy(&datafork, pathname, p - pathname); 4068 archive_strcat(&datafork, p + 2); 4069 if (lstat(datafork.s, &st) == -1 || 4070 (st.st_mode & AE_IFMT) != AE_IFREG) 4071 goto skip_appledouble; 4072 4073 /* 4074 * Check if the file is in the AppleDouble form. 4075 */ 4076 fd = open(pathname, O_RDONLY | O_BINARY | O_CLOEXEC); 4077 __archive_ensure_cloexec_flag(fd); 4078 if (fd == -1) { 4079 archive_set_error(&a->archive, errno, 4080 "Failed to open a restoring file"); 4081 ret = ARCHIVE_WARN; 4082 goto skip_appledouble; 4083 } 4084 if (read(fd, buff, 8) == -1) { 4085 archive_set_error(&a->archive, errno, 4086 "Failed to read a restoring file"); 4087 close(fd); 4088 ret = ARCHIVE_WARN; 4089 goto skip_appledouble; 4090 } 4091 close(fd); 4092 /* Check AppleDouble Magic Code. */ 4093 if (archive_be32dec(buff) != 0x00051607) 4094 goto skip_appledouble; 4095 /* Check AppleDouble Version. */ 4096 if (archive_be32dec(buff+4) != 0x00020000) 4097 goto skip_appledouble; 4098 4099 ret = copy_metadata(a, pathname, datafork.s, 4100#if defined(UF_COMPRESSED) 4101 st.st_flags & UF_COMPRESSED); 4102#else 4103 0); 4104#endif 4105 if (ret == ARCHIVE_OK) { 4106 unlink(pathname); 4107 ret = ARCHIVE_EOF; 4108 } 4109skip_appledouble: 4110 archive_string_free(&datafork); 4111 return (ret); 4112} 4113#endif 4114 4115#if ARCHIVE_XATTR_LINUX || ARCHIVE_XATTR_DARWIN || ARCHIVE_XATTR_AIX 4116/* 4117 * Restore extended attributes - Linux, Darwin and AIX implementations: 4118 * AIX' ea interface is syntaxwise identical to the Linux xattr interface. 4119 */ 4120static int 4121set_xattrs(struct archive_write_disk *a) 4122{ 4123 struct archive_entry *entry = a->entry; 4124 static int warning_done = 0; 4125 int ret = ARCHIVE_OK; 4126 int i = archive_entry_xattr_reset(entry); 4127 4128 while (i--) { 4129 const char *name; 4130 const void *value; 4131 size_t size; 4132 archive_entry_xattr_next(entry, &name, &value, &size); 4133 if (name != NULL && 4134 strncmp(name, "xfsroot.", 8) != 0 && 4135 strncmp(name, "system.", 7) != 0) { 4136 int e; 4137 if (a->fd >= 0) { 4138#if ARCHIVE_XATTR_LINUX 4139 e = fsetxattr(a->fd, name, value, size, 0); 4140#elif ARCHIVE_XATTR_DARWIN 4141 e = fsetxattr(a->fd, name, value, size, 0, 0); 4142#elif ARCHIVE_XATTR_AIX 4143 e = fsetea(a->fd, name, value, size, 0); 4144#endif 4145 } else { 4146#if ARCHIVE_XATTR_LINUX 4147 e = lsetxattr(archive_entry_pathname(entry), 4148 name, value, size, 0); 4149#elif ARCHIVE_XATTR_DARWIN 4150 e = setxattr(archive_entry_pathname(entry), 4151 name, value, size, 0, XATTR_NOFOLLOW); 4152#elif ARCHIVE_XATTR_AIX 4153 e = lsetea(archive_entry_pathname(entry), 4154 name, value, size, 0); 4155#endif 4156 } 4157 if (e == -1) { 4158 if (errno == ENOTSUP || errno == ENOSYS) { 4159 if (!warning_done) { 4160 warning_done = 1; 4161 archive_set_error(&a->archive, 4162 errno, 4163 "Cannot restore extended " 4164 "attributes on this file " 4165 "system"); 4166 } 4167 } else 4168 archive_set_error(&a->archive, errno, 4169 "Failed to set extended attribute"); 4170 ret = ARCHIVE_WARN; 4171 } 4172 } else { 4173 archive_set_error(&a->archive, 4174 ARCHIVE_ERRNO_FILE_FORMAT, 4175 "Invalid extended attribute encountered"); 4176 ret = ARCHIVE_WARN; 4177 } 4178 } 4179 return (ret); 4180} 4181#elif ARCHIVE_XATTR_FREEBSD 4182/* 4183 * Restore extended attributes - FreeBSD implementation 4184 */ 4185static int 4186set_xattrs(struct archive_write_disk *a) 4187{ 4188 struct archive_entry *entry = a->entry; 4189 static int warning_done = 0; 4190 int ret = ARCHIVE_OK; 4191 int i = archive_entry_xattr_reset(entry); 4192 4193 while (i--) { 4194 const char *name; 4195 const void *value; 4196 size_t size; 4197 archive_entry_xattr_next(entry, &name, &value, &size); 4198 if (name != NULL) { 4199 ssize_t e; 4200 int namespace; 4201 4202 if (strncmp(name, "user.", 5) == 0) { 4203 /* "user." attributes go to user namespace */ 4204 name += 5; 4205 namespace = EXTATTR_NAMESPACE_USER; 4206 } else { 4207 /* Warn about other extended attributes. */ 4208 archive_set_error(&a->archive, 4209 ARCHIVE_ERRNO_FILE_FORMAT, 4210 "Can't restore extended attribute ``%s''", 4211 name); 4212 ret = ARCHIVE_WARN; 4213 continue; 4214 } 4215 errno = 0; 4216 4217 if (a->fd >= 0) { 4218 e = extattr_set_fd(a->fd, namespace, name, 4219 value, size); 4220 } else { 4221 e = extattr_set_link( 4222 archive_entry_pathname(entry), namespace, 4223 name, value, size); 4224 } 4225 if (e != (ssize_t)size) { 4226 if (errno == ENOTSUP || errno == ENOSYS) { 4227 if (!warning_done) { 4228 warning_done = 1; 4229 archive_set_error(&a->archive, 4230 errno, 4231 "Cannot restore extended " 4232 "attributes on this file " 4233 "system"); 4234 } 4235 } else { 4236 archive_set_error(&a->archive, errno, 4237 "Failed to set extended attribute"); 4238 } 4239 4240 ret = ARCHIVE_WARN; 4241 } 4242 } 4243 } 4244 return (ret); 4245} 4246#else 4247/* 4248 * Restore extended attributes - stub implementation for unsupported systems 4249 */ 4250static int 4251set_xattrs(struct archive_write_disk *a) 4252{ 4253 static int warning_done = 0; 4254 4255 /* If there aren't any extended attributes, then it's okay not 4256 * to extract them, otherwise, issue a single warning. */ 4257 if (archive_entry_xattr_count(a->entry) != 0 && !warning_done) { 4258 warning_done = 1; 4259 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 4260 "Cannot restore extended attributes on this system"); 4261 return (ARCHIVE_WARN); 4262 } 4263 /* Warning was already emitted; suppress further warnings. */ 4264 return (ARCHIVE_OK); 4265} 4266#endif 4267 4268/* 4269 * Test if file on disk is older than entry. 4270 */ 4271static int 4272older(struct stat *st, struct archive_entry *entry) 4273{ 4274 /* First, test the seconds and return if we have a definite answer. */ 4275 /* Definitely older. */ 4276 if (to_int64_time(st->st_mtime) < to_int64_time(archive_entry_mtime(entry))) 4277 return (1); 4278 /* Definitely younger. */ 4279 if (to_int64_time(st->st_mtime) > to_int64_time(archive_entry_mtime(entry))) 4280 return (0); 4281 /* If this platform supports fractional seconds, try those. */ 4282#if HAVE_STRUCT_STAT_ST_MTIMESPEC_TV_NSEC 4283 /* Definitely older. */ 4284 if (st->st_mtimespec.tv_nsec < archive_entry_mtime_nsec(entry)) 4285 return (1); 4286#elif HAVE_STRUCT_STAT_ST_MTIM_TV_NSEC 4287 /* Definitely older. */ 4288 if (st->st_mtim.tv_nsec < archive_entry_mtime_nsec(entry)) 4289 return (1); 4290#elif HAVE_STRUCT_STAT_ST_MTIME_N 4291 /* older. */ 4292 if (st->st_mtime_n < archive_entry_mtime_nsec(entry)) 4293 return (1); 4294#elif HAVE_STRUCT_STAT_ST_UMTIME 4295 /* older. */ 4296 if (st->st_umtime * 1000 < archive_entry_mtime_nsec(entry)) 4297 return (1); 4298#elif HAVE_STRUCT_STAT_ST_MTIME_USEC 4299 /* older. */ 4300 if (st->st_mtime_usec * 1000 < archive_entry_mtime_nsec(entry)) 4301 return (1); 4302#else 4303 /* This system doesn't have high-res timestamps. */ 4304#endif 4305 /* Same age or newer, so not older. */ 4306 return (0); 4307} 4308 4309#ifndef ARCHIVE_ACL_SUPPORT 4310int 4311archive_write_disk_set_acls(struct archive *a, int fd, const char *name, 4312 struct archive_acl *abstract_acl, __LA_MODE_T mode) 4313{ 4314 (void)a; /* UNUSED */ 4315 (void)fd; /* UNUSED */ 4316 (void)name; /* UNUSED */ 4317 (void)abstract_acl; /* UNUSED */ 4318 (void)mode; /* UNUSED */ 4319 return (ARCHIVE_OK); 4320} 4321#endif 4322 4323#endif /* !_WIN32 || __CYGWIN__ */ 4324 4325