archive_write_disk_posix.c revision 348608
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 * set_mode must precede ACLs on systems such as Solaris and 1709 * FreeBSD where setting the mode implicitly clears extended ACLs 1710 */ 1711 if (a->todo & TODO_MODE) { 1712 int r2 = set_mode(a, a->mode); 1713 if (r2 < ret) ret = r2; 1714 } 1715 1716 /* 1717 * Security-related extended attributes (such as 1718 * security.capability on Linux) have to be restored last, 1719 * since they're implicitly removed by other file changes. 1720 */ 1721 if (a->todo & TODO_XATTR) { 1722 int r2 = set_xattrs(a); 1723 if (r2 < ret) ret = r2; 1724 } 1725 1726 /* 1727 * Some flags prevent file modification; they must be restored after 1728 * file contents are written. 1729 */ 1730 if (a->todo & TODO_FFLAGS) { 1731 int r2 = set_fflags(a); 1732 if (r2 < ret) ret = r2; 1733 } 1734 1735 /* 1736 * Time must follow most other metadata; 1737 * otherwise atime will get changed. 1738 */ 1739 if (a->todo & TODO_TIMES) { 1740 int r2 = set_times_from_entry(a); 1741 if (r2 < ret) ret = r2; 1742 } 1743 1744 /* 1745 * Mac extended metadata includes ACLs. 1746 */ 1747 if (a->todo & TODO_MAC_METADATA) { 1748 const void *metadata; 1749 size_t metadata_size; 1750 metadata = archive_entry_mac_metadata(a->entry, &metadata_size); 1751 if (metadata != NULL && metadata_size > 0) { 1752 int r2 = set_mac_metadata(a, archive_entry_pathname( 1753 a->entry), metadata, metadata_size); 1754 if (r2 < ret) ret = r2; 1755 } 1756 } 1757 1758 /* 1759 * ACLs must be restored after timestamps because there are 1760 * ACLs that prevent attribute changes (including time). 1761 */ 1762 if (a->todo & TODO_ACLS) { 1763 int r2; 1764 r2 = archive_write_disk_set_acls(&a->archive, a->fd, 1765 archive_entry_pathname(a->entry), 1766 archive_entry_acl(a->entry), 1767 archive_entry_mode(a->entry)); 1768 if (r2 < ret) ret = r2; 1769 } 1770 1771finish_metadata: 1772 /* If there's an fd, we can close it now. */ 1773 if (a->fd >= 0) { 1774 close(a->fd); 1775 a->fd = -1; 1776 } 1777 /* If there's an entry, we can release it now. */ 1778 archive_entry_free(a->entry); 1779 a->entry = NULL; 1780 a->archive.state = ARCHIVE_STATE_HEADER; 1781 return (ret); 1782} 1783 1784int 1785archive_write_disk_set_group_lookup(struct archive *_a, 1786 void *private_data, 1787 la_int64_t (*lookup_gid)(void *private, const char *gname, la_int64_t gid), 1788 void (*cleanup_gid)(void *private)) 1789{ 1790 struct archive_write_disk *a = (struct archive_write_disk *)_a; 1791 archive_check_magic(&a->archive, ARCHIVE_WRITE_DISK_MAGIC, 1792 ARCHIVE_STATE_ANY, "archive_write_disk_set_group_lookup"); 1793 1794 if (a->cleanup_gid != NULL && a->lookup_gid_data != NULL) 1795 (a->cleanup_gid)(a->lookup_gid_data); 1796 1797 a->lookup_gid = lookup_gid; 1798 a->cleanup_gid = cleanup_gid; 1799 a->lookup_gid_data = private_data; 1800 return (ARCHIVE_OK); 1801} 1802 1803int 1804archive_write_disk_set_user_lookup(struct archive *_a, 1805 void *private_data, 1806 int64_t (*lookup_uid)(void *private, const char *uname, int64_t uid), 1807 void (*cleanup_uid)(void *private)) 1808{ 1809 struct archive_write_disk *a = (struct archive_write_disk *)_a; 1810 archive_check_magic(&a->archive, ARCHIVE_WRITE_DISK_MAGIC, 1811 ARCHIVE_STATE_ANY, "archive_write_disk_set_user_lookup"); 1812 1813 if (a->cleanup_uid != NULL && a->lookup_uid_data != NULL) 1814 (a->cleanup_uid)(a->lookup_uid_data); 1815 1816 a->lookup_uid = lookup_uid; 1817 a->cleanup_uid = cleanup_uid; 1818 a->lookup_uid_data = private_data; 1819 return (ARCHIVE_OK); 1820} 1821 1822int64_t 1823archive_write_disk_gid(struct archive *_a, const char *name, la_int64_t id) 1824{ 1825 struct archive_write_disk *a = (struct archive_write_disk *)_a; 1826 archive_check_magic(&a->archive, ARCHIVE_WRITE_DISK_MAGIC, 1827 ARCHIVE_STATE_ANY, "archive_write_disk_gid"); 1828 if (a->lookup_gid) 1829 return (a->lookup_gid)(a->lookup_gid_data, name, id); 1830 return (id); 1831} 1832 1833int64_t 1834archive_write_disk_uid(struct archive *_a, const char *name, la_int64_t id) 1835{ 1836 struct archive_write_disk *a = (struct archive_write_disk *)_a; 1837 archive_check_magic(&a->archive, ARCHIVE_WRITE_DISK_MAGIC, 1838 ARCHIVE_STATE_ANY, "archive_write_disk_uid"); 1839 if (a->lookup_uid) 1840 return (a->lookup_uid)(a->lookup_uid_data, name, id); 1841 return (id); 1842} 1843 1844/* 1845 * Create a new archive_write_disk object and initialize it with global state. 1846 */ 1847struct archive * 1848archive_write_disk_new(void) 1849{ 1850 struct archive_write_disk *a; 1851 1852 a = (struct archive_write_disk *)calloc(1, sizeof(*a)); 1853 if (a == NULL) 1854 return (NULL); 1855 a->archive.magic = ARCHIVE_WRITE_DISK_MAGIC; 1856 /* We're ready to write a header immediately. */ 1857 a->archive.state = ARCHIVE_STATE_HEADER; 1858 a->archive.vtable = archive_write_disk_vtable(); 1859 a->start_time = time(NULL); 1860 /* Query and restore the umask. */ 1861 umask(a->user_umask = umask(0)); 1862#ifdef HAVE_GETEUID 1863 a->user_uid = geteuid(); 1864#endif /* HAVE_GETEUID */ 1865 if (archive_string_ensure(&a->path_safe, 512) == NULL) { 1866 free(a); 1867 return (NULL); 1868 } 1869#ifdef HAVE_ZLIB_H 1870 a->decmpfs_compression_level = 5; 1871#endif 1872 return (&a->archive); 1873} 1874 1875 1876/* 1877 * If pathname is longer than PATH_MAX, chdir to a suitable 1878 * intermediate dir and edit the path down to a shorter suffix. Note 1879 * that this routine never returns an error; if the chdir() attempt 1880 * fails for any reason, we just go ahead with the long pathname. The 1881 * object creation is likely to fail, but any error will get handled 1882 * at that time. 1883 */ 1884#if defined(HAVE_FCHDIR) && defined(PATH_MAX) 1885static void 1886edit_deep_directories(struct archive_write_disk *a) 1887{ 1888 int ret; 1889 char *tail = a->name; 1890 1891 /* If path is short, avoid the open() below. */ 1892 if (strlen(tail) < PATH_MAX) 1893 return; 1894 1895 /* Try to record our starting dir. */ 1896 a->restore_pwd = open(".", O_RDONLY | O_BINARY | O_CLOEXEC); 1897 __archive_ensure_cloexec_flag(a->restore_pwd); 1898 if (a->restore_pwd < 0) 1899 return; 1900 1901 /* As long as the path is too long... */ 1902 while (strlen(tail) >= PATH_MAX) { 1903 /* Locate a dir prefix shorter than PATH_MAX. */ 1904 tail += PATH_MAX - 8; 1905 while (tail > a->name && *tail != '/') 1906 tail--; 1907 /* Exit if we find a too-long path component. */ 1908 if (tail <= a->name) 1909 return; 1910 /* Create the intermediate dir and chdir to it. */ 1911 *tail = '\0'; /* Terminate dir portion */ 1912 ret = create_dir(a, a->name); 1913 if (ret == ARCHIVE_OK && chdir(a->name) != 0) 1914 ret = ARCHIVE_FAILED; 1915 *tail = '/'; /* Restore the / we removed. */ 1916 if (ret != ARCHIVE_OK) 1917 return; 1918 tail++; 1919 /* The chdir() succeeded; we've now shortened the path. */ 1920 a->name = tail; 1921 } 1922 return; 1923} 1924#endif 1925 1926/* 1927 * The main restore function. 1928 */ 1929static int 1930restore_entry(struct archive_write_disk *a) 1931{ 1932 int ret = ARCHIVE_OK, en; 1933 1934 if (a->flags & ARCHIVE_EXTRACT_UNLINK && !S_ISDIR(a->mode)) { 1935 /* 1936 * TODO: Fix this. Apparently, there are platforms 1937 * that still allow root to hose the entire filesystem 1938 * by unlinking a dir. The S_ISDIR() test above 1939 * prevents us from using unlink() here if the new 1940 * object is a dir, but that doesn't mean the old 1941 * object isn't a dir. 1942 */ 1943 if (a->flags & ARCHIVE_EXTRACT_CLEAR_NOCHANGE_FFLAGS) 1944 (void)clear_nochange_fflags(a); 1945 if (unlink(a->name) == 0) { 1946 /* We removed it, reset cached stat. */ 1947 a->pst = NULL; 1948 } else if (errno == ENOENT) { 1949 /* File didn't exist, that's just as good. */ 1950 } else if (rmdir(a->name) == 0) { 1951 /* It was a dir, but now it's gone. */ 1952 a->pst = NULL; 1953 } else { 1954 /* We tried, but couldn't get rid of it. */ 1955 archive_set_error(&a->archive, errno, 1956 "Could not unlink"); 1957 return(ARCHIVE_FAILED); 1958 } 1959 } 1960 1961 /* Try creating it first; if this fails, we'll try to recover. */ 1962 en = create_filesystem_object(a); 1963 1964 if ((en == ENOTDIR || en == ENOENT) 1965 && !(a->flags & ARCHIVE_EXTRACT_NO_AUTODIR)) { 1966 /* If the parent dir doesn't exist, try creating it. */ 1967 create_parent_dir(a, a->name); 1968 /* Now try to create the object again. */ 1969 en = create_filesystem_object(a); 1970 } 1971 1972 if ((en == ENOENT) && (archive_entry_hardlink(a->entry) != NULL)) { 1973 archive_set_error(&a->archive, en, 1974 "Hard-link target '%s' does not exist.", 1975 archive_entry_hardlink(a->entry)); 1976 return (ARCHIVE_FAILED); 1977 } 1978 1979 if ((en == EISDIR || en == EEXIST) 1980 && (a->flags & ARCHIVE_EXTRACT_NO_OVERWRITE)) { 1981 /* If we're not overwriting, we're done. */ 1982 if (S_ISDIR(a->mode)) { 1983 /* Don't overwrite any settings on existing directories. */ 1984 a->todo = 0; 1985 } 1986 archive_entry_unset_size(a->entry); 1987 return (ARCHIVE_OK); 1988 } 1989 1990 /* 1991 * Some platforms return EISDIR if you call 1992 * open(O_WRONLY | O_EXCL | O_CREAT) on a directory, some 1993 * return EEXIST. POSIX is ambiguous, requiring EISDIR 1994 * for open(O_WRONLY) on a dir and EEXIST for open(O_EXCL | O_CREAT) 1995 * on an existing item. 1996 */ 1997 if (en == EISDIR) { 1998 /* A dir is in the way of a non-dir, rmdir it. */ 1999 if (rmdir(a->name) != 0) { 2000 archive_set_error(&a->archive, errno, 2001 "Can't remove already-existing dir"); 2002 return (ARCHIVE_FAILED); 2003 } 2004 a->pst = NULL; 2005 /* Try again. */ 2006 en = create_filesystem_object(a); 2007 } else if (en == EEXIST) { 2008 /* 2009 * We know something is in the way, but we don't know what; 2010 * we need to find out before we go any further. 2011 */ 2012 int r = 0; 2013 /* 2014 * The SECURE_SYMLINKS logic has already removed a 2015 * symlink to a dir if the client wants that. So 2016 * follow the symlink if we're creating a dir. 2017 */ 2018 if (S_ISDIR(a->mode)) 2019 r = la_stat(a->name, &a->st); 2020 /* 2021 * If it's not a dir (or it's a broken symlink), 2022 * then don't follow it. 2023 */ 2024 if (r != 0 || !S_ISDIR(a->mode)) 2025 r = lstat(a->name, &a->st); 2026 if (r != 0) { 2027 archive_set_error(&a->archive, errno, 2028 "Can't stat existing object"); 2029 return (ARCHIVE_FAILED); 2030 } 2031 2032 /* 2033 * NO_OVERWRITE_NEWER doesn't apply to directories. 2034 */ 2035 if ((a->flags & ARCHIVE_EXTRACT_NO_OVERWRITE_NEWER) 2036 && !S_ISDIR(a->st.st_mode)) { 2037 if (!older(&(a->st), a->entry)) { 2038 archive_entry_unset_size(a->entry); 2039 return (ARCHIVE_OK); 2040 } 2041 } 2042 2043 /* If it's our archive, we're done. */ 2044 if (a->skip_file_set && 2045 a->st.st_dev == (dev_t)a->skip_file_dev && 2046 a->st.st_ino == (ino_t)a->skip_file_ino) { 2047 archive_set_error(&a->archive, 0, 2048 "Refusing to overwrite archive"); 2049 return (ARCHIVE_FAILED); 2050 } 2051 2052 if (!S_ISDIR(a->st.st_mode)) { 2053 /* A non-dir is in the way, unlink it. */ 2054 if (a->flags & ARCHIVE_EXTRACT_CLEAR_NOCHANGE_FFLAGS) 2055 (void)clear_nochange_fflags(a); 2056 if (unlink(a->name) != 0) { 2057 archive_set_error(&a->archive, errno, 2058 "Can't unlink already-existing object"); 2059 return (ARCHIVE_FAILED); 2060 } 2061 a->pst = NULL; 2062 /* Try again. */ 2063 en = create_filesystem_object(a); 2064 } else if (!S_ISDIR(a->mode)) { 2065 /* A dir is in the way of a non-dir, rmdir it. */ 2066 if (a->flags & ARCHIVE_EXTRACT_CLEAR_NOCHANGE_FFLAGS) 2067 (void)clear_nochange_fflags(a); 2068 if (rmdir(a->name) != 0) { 2069 archive_set_error(&a->archive, errno, 2070 "Can't replace existing directory with non-directory"); 2071 return (ARCHIVE_FAILED); 2072 } 2073 /* Try again. */ 2074 en = create_filesystem_object(a); 2075 } else { 2076 /* 2077 * There's a dir in the way of a dir. Don't 2078 * waste time with rmdir()/mkdir(), just fix 2079 * up the permissions on the existing dir. 2080 * Note that we don't change perms on existing 2081 * dirs unless _EXTRACT_PERM is specified. 2082 */ 2083 if ((a->mode != a->st.st_mode) 2084 && (a->todo & TODO_MODE_FORCE)) 2085 a->deferred |= (a->todo & TODO_MODE); 2086 /* Ownership doesn't need deferred fixup. */ 2087 en = 0; /* Forget the EEXIST. */ 2088 } 2089 } 2090 2091 if (en) { 2092 /* Everything failed; give up here. */ 2093 if ((&a->archive)->error == NULL) 2094 archive_set_error(&a->archive, en, "Can't create '%s'", 2095 a->name); 2096 return (ARCHIVE_FAILED); 2097 } 2098 2099 a->pst = NULL; /* Cached stat data no longer valid. */ 2100 return (ret); 2101} 2102 2103/* 2104 * Returns 0 if creation succeeds, or else returns errno value from 2105 * the failed system call. Note: This function should only ever perform 2106 * a single system call. 2107 */ 2108static int 2109create_filesystem_object(struct archive_write_disk *a) 2110{ 2111 /* Create the entry. */ 2112 const char *linkname; 2113 mode_t final_mode, mode; 2114 int r; 2115 /* these for check_symlinks_fsobj */ 2116 char *linkname_copy; /* non-const copy of linkname */ 2117 struct stat st; 2118 struct archive_string error_string; 2119 int error_number; 2120 2121 /* We identify hard/symlinks according to the link names. */ 2122 /* Since link(2) and symlink(2) don't handle modes, we're done here. */ 2123 linkname = archive_entry_hardlink(a->entry); 2124 if (linkname != NULL) { 2125#if !HAVE_LINK 2126 return (EPERM); 2127#else 2128 archive_string_init(&error_string); 2129 linkname_copy = strdup(linkname); 2130 if (linkname_copy == NULL) { 2131 return (EPERM); 2132 } 2133 /* 2134 * TODO: consider using the cleaned-up path as the link 2135 * target? 2136 */ 2137 r = cleanup_pathname_fsobj(linkname_copy, &error_number, 2138 &error_string, a->flags); 2139 if (r != ARCHIVE_OK) { 2140 archive_set_error(&a->archive, error_number, "%s", 2141 error_string.s); 2142 free(linkname_copy); 2143 archive_string_free(&error_string); 2144 /* 2145 * EPERM is more appropriate than error_number for our 2146 * callers 2147 */ 2148 return (EPERM); 2149 } 2150 r = check_symlinks_fsobj(linkname_copy, &error_number, 2151 &error_string, a->flags); 2152 if (r != ARCHIVE_OK) { 2153 archive_set_error(&a->archive, error_number, "%s", 2154 error_string.s); 2155 free(linkname_copy); 2156 archive_string_free(&error_string); 2157 /* 2158 * EPERM is more appropriate than error_number for our 2159 * callers 2160 */ 2161 return (EPERM); 2162 } 2163 free(linkname_copy); 2164 archive_string_free(&error_string); 2165 r = link(linkname, a->name) ? errno : 0; 2166 /* 2167 * New cpio and pax formats allow hardlink entries 2168 * to carry data, so we may have to open the file 2169 * for hardlink entries. 2170 * 2171 * If the hardlink was successfully created and 2172 * the archive doesn't have carry data for it, 2173 * consider it to be non-authoritative for meta data. 2174 * This is consistent with GNU tar and BSD pax. 2175 * If the hardlink does carry data, let the last 2176 * archive entry decide ownership. 2177 */ 2178 if (r == 0 && a->filesize <= 0) { 2179 a->todo = 0; 2180 a->deferred = 0; 2181 } else if (r == 0 && a->filesize > 0) { 2182#ifdef HAVE_LSTAT 2183 r = lstat(a->name, &st); 2184#else 2185 r = la_stat(a->name, &st); 2186#endif 2187 if (r != 0) 2188 r = errno; 2189 else if ((st.st_mode & AE_IFMT) == AE_IFREG) { 2190 a->fd = open(a->name, O_WRONLY | O_TRUNC | 2191 O_BINARY | O_CLOEXEC | O_NOFOLLOW); 2192 __archive_ensure_cloexec_flag(a->fd); 2193 if (a->fd < 0) 2194 r = errno; 2195 } 2196 } 2197 return (r); 2198#endif 2199 } 2200 linkname = archive_entry_symlink(a->entry); 2201 if (linkname != NULL) { 2202#if HAVE_SYMLINK 2203 return symlink(linkname, a->name) ? errno : 0; 2204#else 2205 return (EPERM); 2206#endif 2207 } 2208 2209 /* 2210 * The remaining system calls all set permissions, so let's 2211 * try to take advantage of that to avoid an extra chmod() 2212 * call. (Recall that umask is set to zero right now!) 2213 */ 2214 2215 /* Mode we want for the final restored object (w/o file type bits). */ 2216 final_mode = a->mode & 07777; 2217 /* 2218 * The mode that will actually be restored in this step. Note 2219 * that SUID, SGID, etc, require additional work to ensure 2220 * security, so we never restore them at this point. 2221 */ 2222 mode = final_mode & 0777 & ~a->user_umask; 2223 2224 switch (a->mode & AE_IFMT) { 2225 default: 2226 /* POSIX requires that we fall through here. */ 2227 /* FALLTHROUGH */ 2228 case AE_IFREG: 2229 a->fd = open(a->name, 2230 O_WRONLY | O_CREAT | O_EXCL | O_BINARY | O_CLOEXEC, mode); 2231 __archive_ensure_cloexec_flag(a->fd); 2232 r = (a->fd < 0); 2233 break; 2234 case AE_IFCHR: 2235#ifdef HAVE_MKNOD 2236 /* Note: we use AE_IFCHR for the case label, and 2237 * S_IFCHR for the mknod() call. This is correct. */ 2238 r = mknod(a->name, mode | S_IFCHR, 2239 archive_entry_rdev(a->entry)); 2240 break; 2241#else 2242 /* TODO: Find a better way to warn about our inability 2243 * to restore a char device node. */ 2244 return (EINVAL); 2245#endif /* HAVE_MKNOD */ 2246 case AE_IFBLK: 2247#ifdef HAVE_MKNOD 2248 r = mknod(a->name, mode | S_IFBLK, 2249 archive_entry_rdev(a->entry)); 2250 break; 2251#else 2252 /* TODO: Find a better way to warn about our inability 2253 * to restore a block device node. */ 2254 return (EINVAL); 2255#endif /* HAVE_MKNOD */ 2256 case AE_IFDIR: 2257 mode = (mode | MINIMUM_DIR_MODE) & MAXIMUM_DIR_MODE; 2258 r = mkdir(a->name, mode); 2259 if (r == 0) { 2260 /* Defer setting dir times. */ 2261 a->deferred |= (a->todo & TODO_TIMES); 2262 a->todo &= ~TODO_TIMES; 2263 /* Never use an immediate chmod(). */ 2264 /* We can't avoid the chmod() entirely if EXTRACT_PERM 2265 * because of SysV SGID inheritance. */ 2266 if ((mode != final_mode) 2267 || (a->flags & ARCHIVE_EXTRACT_PERM)) 2268 a->deferred |= (a->todo & TODO_MODE); 2269 a->todo &= ~TODO_MODE; 2270 } 2271 break; 2272 case AE_IFIFO: 2273#ifdef HAVE_MKFIFO 2274 r = mkfifo(a->name, mode); 2275 break; 2276#else 2277 /* TODO: Find a better way to warn about our inability 2278 * to restore a fifo. */ 2279 return (EINVAL); 2280#endif /* HAVE_MKFIFO */ 2281 } 2282 2283 /* All the system calls above set errno on failure. */ 2284 if (r) 2285 return (errno); 2286 2287 /* If we managed to set the final mode, we've avoided a chmod(). */ 2288 if (mode == final_mode) 2289 a->todo &= ~TODO_MODE; 2290 return (0); 2291} 2292 2293/* 2294 * Cleanup function for archive_extract. Mostly, this involves processing 2295 * the fixup list, which is used to address a number of problems: 2296 * * Dir permissions might prevent us from restoring a file in that 2297 * dir, so we restore the dir with minimum 0700 permissions first, 2298 * then correct the mode at the end. 2299 * * Similarly, the act of restoring a file touches the directory 2300 * and changes the timestamp on the dir, so we have to touch-up dir 2301 * timestamps at the end as well. 2302 * * Some file flags can interfere with the restore by, for example, 2303 * preventing the creation of hardlinks to those files. 2304 * * Mac OS extended metadata includes ACLs, so must be deferred on dirs. 2305 * 2306 * Note that tar/cpio do not require that archives be in a particular 2307 * order; there is no way to know when the last file has been restored 2308 * within a directory, so there's no way to optimize the memory usage 2309 * here by fixing up the directory any earlier than the 2310 * end-of-archive. 2311 * 2312 * XXX TODO: Directory ACLs should be restored here, for the same 2313 * reason we set directory perms here. XXX 2314 */ 2315static int 2316_archive_write_disk_close(struct archive *_a) 2317{ 2318 struct archive_write_disk *a = (struct archive_write_disk *)_a; 2319 struct fixup_entry *next, *p; 2320 int ret; 2321 2322 archive_check_magic(&a->archive, ARCHIVE_WRITE_DISK_MAGIC, 2323 ARCHIVE_STATE_HEADER | ARCHIVE_STATE_DATA, 2324 "archive_write_disk_close"); 2325 ret = _archive_write_disk_finish_entry(&a->archive); 2326 2327 /* Sort dir list so directories are fixed up in depth-first order. */ 2328 p = sort_dir_list(a->fixup_list); 2329 2330 while (p != NULL) { 2331 a->pst = NULL; /* Mark stat cache as out-of-date. */ 2332 if (p->fixup & TODO_TIMES) { 2333 set_times(a, -1, p->mode, p->name, 2334 p->atime, p->atime_nanos, 2335 p->birthtime, p->birthtime_nanos, 2336 p->mtime, p->mtime_nanos, 2337 p->ctime, p->ctime_nanos); 2338 } 2339 if (p->fixup & TODO_MODE_BASE) 2340 chmod(p->name, p->mode); 2341 if (p->fixup & TODO_ACLS) 2342 archive_write_disk_set_acls(&a->archive, -1, p->name, 2343 &p->acl, p->mode); 2344 if (p->fixup & TODO_FFLAGS) 2345 set_fflags_platform(a, -1, p->name, 2346 p->mode, p->fflags_set, 0); 2347 if (p->fixup & TODO_MAC_METADATA) 2348 set_mac_metadata(a, p->name, p->mac_metadata, 2349 p->mac_metadata_size); 2350 next = p->next; 2351 archive_acl_clear(&p->acl); 2352 free(p->mac_metadata); 2353 free(p->name); 2354 free(p); 2355 p = next; 2356 } 2357 a->fixup_list = NULL; 2358 return (ret); 2359} 2360 2361static int 2362_archive_write_disk_free(struct archive *_a) 2363{ 2364 struct archive_write_disk *a; 2365 int ret; 2366 if (_a == NULL) 2367 return (ARCHIVE_OK); 2368 archive_check_magic(_a, ARCHIVE_WRITE_DISK_MAGIC, 2369 ARCHIVE_STATE_ANY | ARCHIVE_STATE_FATAL, "archive_write_disk_free"); 2370 a = (struct archive_write_disk *)_a; 2371 ret = _archive_write_disk_close(&a->archive); 2372 archive_write_disk_set_group_lookup(&a->archive, NULL, NULL, NULL); 2373 archive_write_disk_set_user_lookup(&a->archive, NULL, NULL, NULL); 2374 archive_entry_free(a->entry); 2375 archive_string_free(&a->_name_data); 2376 archive_string_free(&a->archive.error_string); 2377 archive_string_free(&a->path_safe); 2378 a->archive.magic = 0; 2379 __archive_clean(&a->archive); 2380 free(a->decmpfs_header_p); 2381 free(a->resource_fork); 2382 free(a->compressed_buffer); 2383 free(a->uncompressed_buffer); 2384#if defined(__APPLE__) && defined(UF_COMPRESSED) && defined(HAVE_SYS_XATTR_H)\ 2385 && defined(HAVE_ZLIB_H) 2386 if (a->stream_valid) { 2387 switch (deflateEnd(&a->stream)) { 2388 case Z_OK: 2389 break; 2390 default: 2391 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 2392 "Failed to clean up compressor"); 2393 ret = ARCHIVE_FATAL; 2394 break; 2395 } 2396 } 2397#endif 2398 free(a); 2399 return (ret); 2400} 2401 2402/* 2403 * Simple O(n log n) merge sort to order the fixup list. In 2404 * particular, we want to restore dir timestamps depth-first. 2405 */ 2406static struct fixup_entry * 2407sort_dir_list(struct fixup_entry *p) 2408{ 2409 struct fixup_entry *a, *b, *t; 2410 2411 if (p == NULL) 2412 return (NULL); 2413 /* A one-item list is already sorted. */ 2414 if (p->next == NULL) 2415 return (p); 2416 2417 /* Step 1: split the list. */ 2418 t = p; 2419 a = p->next->next; 2420 while (a != NULL) { 2421 /* Step a twice, t once. */ 2422 a = a->next; 2423 if (a != NULL) 2424 a = a->next; 2425 t = t->next; 2426 } 2427 /* Now, t is at the mid-point, so break the list here. */ 2428 b = t->next; 2429 t->next = NULL; 2430 a = p; 2431 2432 /* Step 2: Recursively sort the two sub-lists. */ 2433 a = sort_dir_list(a); 2434 b = sort_dir_list(b); 2435 2436 /* Step 3: Merge the returned lists. */ 2437 /* Pick the first element for the merged list. */ 2438 if (strcmp(a->name, b->name) > 0) { 2439 t = p = a; 2440 a = a->next; 2441 } else { 2442 t = p = b; 2443 b = b->next; 2444 } 2445 2446 /* Always put the later element on the list first. */ 2447 while (a != NULL && b != NULL) { 2448 if (strcmp(a->name, b->name) > 0) { 2449 t->next = a; 2450 a = a->next; 2451 } else { 2452 t->next = b; 2453 b = b->next; 2454 } 2455 t = t->next; 2456 } 2457 2458 /* Only one list is non-empty, so just splice it on. */ 2459 if (a != NULL) 2460 t->next = a; 2461 if (b != NULL) 2462 t->next = b; 2463 2464 return (p); 2465} 2466 2467/* 2468 * Returns a new, initialized fixup entry. 2469 * 2470 * TODO: Reduce the memory requirements for this list by using a tree 2471 * structure rather than a simple list of names. 2472 */ 2473static struct fixup_entry * 2474new_fixup(struct archive_write_disk *a, const char *pathname) 2475{ 2476 struct fixup_entry *fe; 2477 2478 fe = (struct fixup_entry *)calloc(1, sizeof(struct fixup_entry)); 2479 if (fe == NULL) { 2480 archive_set_error(&a->archive, ENOMEM, 2481 "Can't allocate memory for a fixup"); 2482 return (NULL); 2483 } 2484 fe->next = a->fixup_list; 2485 a->fixup_list = fe; 2486 fe->fixup = 0; 2487 fe->name = strdup(pathname); 2488 return (fe); 2489} 2490 2491/* 2492 * Returns a fixup structure for the current entry. 2493 */ 2494static struct fixup_entry * 2495current_fixup(struct archive_write_disk *a, const char *pathname) 2496{ 2497 if (a->current_fixup == NULL) 2498 a->current_fixup = new_fixup(a, pathname); 2499 return (a->current_fixup); 2500} 2501 2502/* Error helper for new *_fsobj functions */ 2503static void 2504fsobj_error(int *a_eno, struct archive_string *a_estr, 2505 int err, const char *errstr, const char *path) 2506{ 2507 if (a_eno) 2508 *a_eno = err; 2509 if (a_estr) 2510 archive_string_sprintf(a_estr, "%s%s", errstr, path); 2511} 2512 2513/* 2514 * TODO: Someday, integrate this with the deep dir support; they both 2515 * scan the path and both can be optimized by comparing against other 2516 * recent paths. 2517 */ 2518/* TODO: Extend this to support symlinks on Windows Vista and later. */ 2519 2520/* 2521 * Checks the given path to see if any elements along it are symlinks. Returns 2522 * ARCHIVE_OK if there are none, otherwise puts an error in errmsg. 2523 */ 2524static int 2525check_symlinks_fsobj(char *path, int *a_eno, struct archive_string *a_estr, 2526 int flags) 2527{ 2528#if !defined(HAVE_LSTAT) 2529 /* Platform doesn't have lstat, so we can't look for symlinks. */ 2530 (void)path; /* UNUSED */ 2531 (void)error_number; /* UNUSED */ 2532 (void)error_string; /* UNUSED */ 2533 (void)flags; /* UNUSED */ 2534 return (ARCHIVE_OK); 2535#else 2536 int res = ARCHIVE_OK; 2537 char *tail; 2538 char *head; 2539 int last; 2540 char c; 2541 int r; 2542 struct stat st; 2543 int restore_pwd; 2544 2545 /* Nothing to do here if name is empty */ 2546 if(path[0] == '\0') 2547 return (ARCHIVE_OK); 2548 2549 /* 2550 * Guard against symlink tricks. Reject any archive entry whose 2551 * destination would be altered by a symlink. 2552 * 2553 * Walk the filename in chunks separated by '/'. For each segment: 2554 * - if it doesn't exist, continue 2555 * - if it's symlink, abort or remove it 2556 * - if it's a directory and it's not the last chunk, cd into it 2557 * As we go: 2558 * head points to the current (relative) path 2559 * tail points to the temporary \0 terminating the segment we're 2560 * currently examining 2561 * c holds what used to be in *tail 2562 * last is 1 if this is the last tail 2563 */ 2564 restore_pwd = open(".", O_RDONLY | O_BINARY | O_CLOEXEC); 2565 __archive_ensure_cloexec_flag(restore_pwd); 2566 if (restore_pwd < 0) { 2567 fsobj_error(a_eno, a_estr, errno, 2568 "Could not open ", path); 2569 return (ARCHIVE_FATAL); 2570 } 2571 head = path; 2572 tail = path; 2573 last = 0; 2574 /* TODO: reintroduce a safe cache here? */ 2575 /* Skip the root directory if the path is absolute. */ 2576 if(tail == path && tail[0] == '/') 2577 ++tail; 2578 /* Keep going until we've checked the entire name. 2579 * head, tail, path all alias the same string, which is 2580 * temporarily zeroed at tail, so be careful restoring the 2581 * stashed (c=tail[0]) for error messages. 2582 * Exiting the loop with break is okay; continue is not. 2583 */ 2584 while (!last) { 2585 /* 2586 * Skip the separator we just consumed, plus any adjacent ones 2587 */ 2588 while (*tail == '/') 2589 ++tail; 2590 /* Skip the next path element. */ 2591 while (*tail != '\0' && *tail != '/') 2592 ++tail; 2593 /* is this the last path component? */ 2594 last = (tail[0] == '\0') || (tail[0] == '/' && tail[1] == '\0'); 2595 /* temporarily truncate the string here */ 2596 c = tail[0]; 2597 tail[0] = '\0'; 2598 /* Check that we haven't hit a symlink. */ 2599 r = lstat(head, &st); 2600 if (r != 0) { 2601 tail[0] = c; 2602 /* We've hit a dir that doesn't exist; stop now. */ 2603 if (errno == ENOENT) { 2604 break; 2605 } else { 2606 /* 2607 * Treat any other error as fatal - best to be 2608 * paranoid here. 2609 * Note: This effectively disables deep 2610 * directory support when security checks are 2611 * enabled. Otherwise, very long pathnames that 2612 * trigger an error here could evade the 2613 * sandbox. 2614 * TODO: We could do better, but it would 2615 * probably require merging the symlink checks 2616 * with the deep-directory editing. 2617 */ 2618 fsobj_error(a_eno, a_estr, errno, 2619 "Could not stat ", path); 2620 res = ARCHIVE_FAILED; 2621 break; 2622 } 2623 } else if (S_ISDIR(st.st_mode)) { 2624 if (!last) { 2625 if (chdir(head) != 0) { 2626 tail[0] = c; 2627 fsobj_error(a_eno, a_estr, errno, 2628 "Could not chdir ", path); 2629 res = (ARCHIVE_FATAL); 2630 break; 2631 } 2632 /* Our view is now from inside this dir: */ 2633 head = tail + 1; 2634 } 2635 } else if (S_ISLNK(st.st_mode)) { 2636 if (last) { 2637 /* 2638 * Last element is symlink; remove it 2639 * so we can overwrite it with the 2640 * item being extracted. 2641 */ 2642 if (unlink(head)) { 2643 tail[0] = c; 2644 fsobj_error(a_eno, a_estr, errno, 2645 "Could not remove symlink ", 2646 path); 2647 res = ARCHIVE_FAILED; 2648 break; 2649 } 2650 /* 2651 * Even if we did remove it, a warning 2652 * is in order. The warning is silly, 2653 * though, if we're just replacing one 2654 * symlink with another symlink. 2655 */ 2656 tail[0] = c; 2657 /* 2658 * FIXME: not sure how important this is to 2659 * restore 2660 */ 2661 /* 2662 if (!S_ISLNK(path)) { 2663 fsobj_error(a_eno, a_estr, 0, 2664 "Removing symlink ", path); 2665 } 2666 */ 2667 /* Symlink gone. No more problem! */ 2668 res = ARCHIVE_OK; 2669 break; 2670 } else if (flags & ARCHIVE_EXTRACT_UNLINK) { 2671 /* User asked us to remove problems. */ 2672 if (unlink(head) != 0) { 2673 tail[0] = c; 2674 fsobj_error(a_eno, a_estr, 0, 2675 "Cannot remove intervening " 2676 "symlink ", path); 2677 res = ARCHIVE_FAILED; 2678 break; 2679 } 2680 tail[0] = c; 2681 } else if ((flags & 2682 ARCHIVE_EXTRACT_SECURE_SYMLINKS) == 0) { 2683 /* 2684 * We are not the last element and we want to 2685 * follow symlinks if they are a directory. 2686 * 2687 * This is needed to extract hardlinks over 2688 * symlinks. 2689 */ 2690 r = la_stat(head, &st); 2691 if (r != 0) { 2692 tail[0] = c; 2693 if (errno == ENOENT) { 2694 break; 2695 } else { 2696 fsobj_error(a_eno, a_estr, 2697 errno, 2698 "Could not stat ", path); 2699 res = (ARCHIVE_FAILED); 2700 break; 2701 } 2702 } else if (S_ISDIR(st.st_mode)) { 2703 if (chdir(head) != 0) { 2704 tail[0] = c; 2705 fsobj_error(a_eno, a_estr, 2706 errno, 2707 "Could not chdir ", path); 2708 res = (ARCHIVE_FATAL); 2709 break; 2710 } 2711 /* 2712 * Our view is now from inside 2713 * this dir: 2714 */ 2715 head = tail + 1; 2716 } else { 2717 tail[0] = c; 2718 fsobj_error(a_eno, a_estr, 0, 2719 "Cannot extract through " 2720 "symlink ", path); 2721 res = ARCHIVE_FAILED; 2722 break; 2723 } 2724 } else { 2725 tail[0] = c; 2726 fsobj_error(a_eno, a_estr, 0, 2727 "Cannot extract through symlink ", path); 2728 res = ARCHIVE_FAILED; 2729 break; 2730 } 2731 } 2732 /* be sure to always maintain this */ 2733 tail[0] = c; 2734 if (tail[0] != '\0') 2735 tail++; /* Advance to the next segment. */ 2736 } 2737 /* Catches loop exits via break */ 2738 tail[0] = c; 2739#ifdef HAVE_FCHDIR 2740 /* If we changed directory above, restore it here. */ 2741 if (restore_pwd >= 0) { 2742 r = fchdir(restore_pwd); 2743 if (r != 0) { 2744 fsobj_error(a_eno, a_estr, errno, 2745 "chdir() failure", ""); 2746 } 2747 close(restore_pwd); 2748 restore_pwd = -1; 2749 if (r != 0) { 2750 res = (ARCHIVE_FATAL); 2751 } 2752 } 2753#endif 2754 /* TODO: reintroduce a safe cache here? */ 2755 return res; 2756#endif 2757} 2758 2759/* 2760 * Check a->name for symlinks, returning ARCHIVE_OK if its clean, otherwise 2761 * calls archive_set_error and returns ARCHIVE_{FATAL,FAILED} 2762 */ 2763static int 2764check_symlinks(struct archive_write_disk *a) 2765{ 2766 struct archive_string error_string; 2767 int error_number; 2768 int rc; 2769 archive_string_init(&error_string); 2770 rc = check_symlinks_fsobj(a->name, &error_number, &error_string, 2771 a->flags); 2772 if (rc != ARCHIVE_OK) { 2773 archive_set_error(&a->archive, error_number, "%s", 2774 error_string.s); 2775 } 2776 archive_string_free(&error_string); 2777 a->pst = NULL; /* to be safe */ 2778 return rc; 2779} 2780 2781 2782#if defined(__CYGWIN__) 2783/* 2784 * 1. Convert a path separator from '\' to '/' . 2785 * We shouldn't check multibyte character directly because some 2786 * character-set have been using the '\' character for a part of 2787 * its multibyte character code. 2788 * 2. Replace unusable characters in Windows with underscore('_'). 2789 * See also : http://msdn.microsoft.com/en-us/library/aa365247.aspx 2790 */ 2791static void 2792cleanup_pathname_win(char *path) 2793{ 2794 wchar_t wc; 2795 char *p; 2796 size_t alen, l; 2797 int mb, complete, utf8; 2798 2799 alen = 0; 2800 mb = 0; 2801 complete = 1; 2802 utf8 = (strcmp(nl_langinfo(CODESET), "UTF-8") == 0)? 1: 0; 2803 for (p = path; *p != '\0'; p++) { 2804 ++alen; 2805 if (*p == '\\') { 2806 /* If previous byte is smaller than 128, 2807 * this is not second byte of multibyte characters, 2808 * so we can replace '\' with '/'. */ 2809 if (utf8 || !mb) 2810 *p = '/'; 2811 else 2812 complete = 0;/* uncompleted. */ 2813 } else if (*(unsigned char *)p > 127) 2814 mb = 1; 2815 else 2816 mb = 0; 2817 /* Rewrite the path name if its next character is unusable. */ 2818 if (*p == ':' || *p == '*' || *p == '?' || *p == '"' || 2819 *p == '<' || *p == '>' || *p == '|') 2820 *p = '_'; 2821 } 2822 if (complete) 2823 return; 2824 2825 /* 2826 * Convert path separator in wide-character. 2827 */ 2828 p = path; 2829 while (*p != '\0' && alen) { 2830 l = mbtowc(&wc, p, alen); 2831 if (l == (size_t)-1) { 2832 while (*p != '\0') { 2833 if (*p == '\\') 2834 *p = '/'; 2835 ++p; 2836 } 2837 break; 2838 } 2839 if (l == 1 && wc == L'\\') 2840 *p = '/'; 2841 p += l; 2842 alen -= l; 2843 } 2844} 2845#endif 2846 2847/* 2848 * Canonicalize the pathname. In particular, this strips duplicate 2849 * '/' characters, '.' elements, and trailing '/'. It also raises an 2850 * error for an empty path, a trailing '..', (if _SECURE_NODOTDOT is 2851 * set) any '..' in the path or (if ARCHIVE_EXTRACT_SECURE_NOABSOLUTEPATHS 2852 * is set) if the path is absolute. 2853 */ 2854static int 2855cleanup_pathname_fsobj(char *path, int *a_eno, struct archive_string *a_estr, 2856 int flags) 2857{ 2858 char *dest, *src; 2859 char separator = '\0'; 2860 2861 dest = src = path; 2862 if (*src == '\0') { 2863 fsobj_error(a_eno, a_estr, ARCHIVE_ERRNO_MISC, 2864 "Invalid empty ", "pathname"); 2865 return (ARCHIVE_FAILED); 2866 } 2867 2868#if defined(__CYGWIN__) 2869 cleanup_pathname_win(path); 2870#endif 2871 /* Skip leading '/'. */ 2872 if (*src == '/') { 2873 if (flags & ARCHIVE_EXTRACT_SECURE_NOABSOLUTEPATHS) { 2874 fsobj_error(a_eno, a_estr, ARCHIVE_ERRNO_MISC, 2875 "Path is ", "absolute"); 2876 return (ARCHIVE_FAILED); 2877 } 2878 2879 separator = *src++; 2880 } 2881 2882 /* Scan the pathname one element at a time. */ 2883 for (;;) { 2884 /* src points to first char after '/' */ 2885 if (src[0] == '\0') { 2886 break; 2887 } else if (src[0] == '/') { 2888 /* Found '//', ignore second one. */ 2889 src++; 2890 continue; 2891 } else if (src[0] == '.') { 2892 if (src[1] == '\0') { 2893 /* Ignore trailing '.' */ 2894 break; 2895 } else if (src[1] == '/') { 2896 /* Skip './'. */ 2897 src += 2; 2898 continue; 2899 } else if (src[1] == '.') { 2900 if (src[2] == '/' || src[2] == '\0') { 2901 /* Conditionally warn about '..' */ 2902 if (flags 2903 & ARCHIVE_EXTRACT_SECURE_NODOTDOT) { 2904 fsobj_error(a_eno, a_estr, 2905 ARCHIVE_ERRNO_MISC, 2906 "Path contains ", "'..'"); 2907 return (ARCHIVE_FAILED); 2908 } 2909 } 2910 /* 2911 * Note: Under no circumstances do we 2912 * remove '..' elements. In 2913 * particular, restoring 2914 * '/foo/../bar/' should create the 2915 * 'foo' dir as a side-effect. 2916 */ 2917 } 2918 } 2919 2920 /* Copy current element, including leading '/'. */ 2921 if (separator) 2922 *dest++ = '/'; 2923 while (*src != '\0' && *src != '/') { 2924 *dest++ = *src++; 2925 } 2926 2927 if (*src == '\0') 2928 break; 2929 2930 /* Skip '/' separator. */ 2931 separator = *src++; 2932 } 2933 /* 2934 * We've just copied zero or more path elements, not including the 2935 * final '/'. 2936 */ 2937 if (dest == path) { 2938 /* 2939 * Nothing got copied. The path must have been something 2940 * like '.' or '/' or './' or '/././././/./'. 2941 */ 2942 if (separator) 2943 *dest++ = '/'; 2944 else 2945 *dest++ = '.'; 2946 } 2947 /* Terminate the result. */ 2948 *dest = '\0'; 2949 return (ARCHIVE_OK); 2950} 2951 2952static int 2953cleanup_pathname(struct archive_write_disk *a) 2954{ 2955 struct archive_string error_string; 2956 int error_number; 2957 int rc; 2958 archive_string_init(&error_string); 2959 rc = cleanup_pathname_fsobj(a->name, &error_number, &error_string, 2960 a->flags); 2961 if (rc != ARCHIVE_OK) { 2962 archive_set_error(&a->archive, error_number, "%s", 2963 error_string.s); 2964 } 2965 archive_string_free(&error_string); 2966 return rc; 2967} 2968 2969/* 2970 * Create the parent directory of the specified path, assuming path 2971 * is already in mutable storage. 2972 */ 2973static int 2974create_parent_dir(struct archive_write_disk *a, char *path) 2975{ 2976 char *slash; 2977 int r; 2978 2979 /* Remove tail element to obtain parent name. */ 2980 slash = strrchr(path, '/'); 2981 if (slash == NULL) 2982 return (ARCHIVE_OK); 2983 *slash = '\0'; 2984 r = create_dir(a, path); 2985 *slash = '/'; 2986 return (r); 2987} 2988 2989/* 2990 * Create the specified dir, recursing to create parents as necessary. 2991 * 2992 * Returns ARCHIVE_OK if the path exists when we're done here. 2993 * Otherwise, returns ARCHIVE_FAILED. 2994 * Assumes path is in mutable storage; path is unchanged on exit. 2995 */ 2996static int 2997create_dir(struct archive_write_disk *a, char *path) 2998{ 2999 struct stat st; 3000 struct fixup_entry *le; 3001 char *slash, *base; 3002 mode_t mode_final, mode; 3003 int r; 3004 3005 /* Check for special names and just skip them. */ 3006 slash = strrchr(path, '/'); 3007 if (slash == NULL) 3008 base = path; 3009 else 3010 base = slash + 1; 3011 3012 if (base[0] == '\0' || 3013 (base[0] == '.' && base[1] == '\0') || 3014 (base[0] == '.' && base[1] == '.' && base[2] == '\0')) { 3015 /* Don't bother trying to create null path, '.', or '..'. */ 3016 if (slash != NULL) { 3017 *slash = '\0'; 3018 r = create_dir(a, path); 3019 *slash = '/'; 3020 return (r); 3021 } 3022 return (ARCHIVE_OK); 3023 } 3024 3025 /* 3026 * Yes, this should be stat() and not lstat(). Using lstat() 3027 * here loses the ability to extract through symlinks. Also note 3028 * that this should not use the a->st cache. 3029 */ 3030 if (la_stat(path, &st) == 0) { 3031 if (S_ISDIR(st.st_mode)) 3032 return (ARCHIVE_OK); 3033 if ((a->flags & ARCHIVE_EXTRACT_NO_OVERWRITE)) { 3034 archive_set_error(&a->archive, EEXIST, 3035 "Can't create directory '%s'", path); 3036 return (ARCHIVE_FAILED); 3037 } 3038 if (unlink(path) != 0) { 3039 archive_set_error(&a->archive, errno, 3040 "Can't create directory '%s': " 3041 "Conflicting file cannot be removed", 3042 path); 3043 return (ARCHIVE_FAILED); 3044 } 3045 } else if (errno != ENOENT && errno != ENOTDIR) { 3046 /* Stat failed? */ 3047 archive_set_error(&a->archive, errno, 3048 "Can't test directory '%s'", path); 3049 return (ARCHIVE_FAILED); 3050 } else if (slash != NULL) { 3051 *slash = '\0'; 3052 r = create_dir(a, path); 3053 *slash = '/'; 3054 if (r != ARCHIVE_OK) 3055 return (r); 3056 } 3057 3058 /* 3059 * Mode we want for the final restored directory. Per POSIX, 3060 * implicitly-created dirs must be created obeying the umask. 3061 * There's no mention whether this is different for privileged 3062 * restores (which the rest of this code handles by pretending 3063 * umask=0). I've chosen here to always obey the user's umask for 3064 * implicit dirs, even if _EXTRACT_PERM was specified. 3065 */ 3066 mode_final = DEFAULT_DIR_MODE & ~a->user_umask; 3067 /* Mode we want on disk during the restore process. */ 3068 mode = mode_final; 3069 mode |= MINIMUM_DIR_MODE; 3070 mode &= MAXIMUM_DIR_MODE; 3071 if (mkdir(path, mode) == 0) { 3072 if (mode != mode_final) { 3073 le = new_fixup(a, path); 3074 if (le == NULL) 3075 return (ARCHIVE_FATAL); 3076 le->fixup |=TODO_MODE_BASE; 3077 le->mode = mode_final; 3078 } 3079 return (ARCHIVE_OK); 3080 } 3081 3082 /* 3083 * Without the following check, a/b/../b/c/d fails at the 3084 * second visit to 'b', so 'd' can't be created. Note that we 3085 * don't add it to the fixup list here, as it's already been 3086 * added. 3087 */ 3088 if (la_stat(path, &st) == 0 && S_ISDIR(st.st_mode)) 3089 return (ARCHIVE_OK); 3090 3091 archive_set_error(&a->archive, errno, "Failed to create dir '%s'", 3092 path); 3093 return (ARCHIVE_FAILED); 3094} 3095 3096/* 3097 * Note: Although we can skip setting the user id if the desired user 3098 * id matches the current user, we cannot skip setting the group, as 3099 * many systems set the gid based on the containing directory. So 3100 * we have to perform a chown syscall if we want to set the SGID 3101 * bit. (The alternative is to stat() and then possibly chown(); it's 3102 * more efficient to skip the stat() and just always chown().) Note 3103 * that a successful chown() here clears the TODO_SGID_CHECK bit, which 3104 * allows set_mode to skip the stat() check for the GID. 3105 */ 3106static int 3107set_ownership(struct archive_write_disk *a) 3108{ 3109#if !defined(__CYGWIN__) && !defined(__linux__) 3110/* 3111 * On Linux, a process may have the CAP_CHOWN capability. 3112 * On Windows there is no 'root' user with uid 0. 3113 * Elsewhere we can skip calling chown if we are not root and the desired 3114 * user id does not match the current user. 3115 */ 3116 if (a->user_uid != 0 && a->user_uid != a->uid) { 3117 archive_set_error(&a->archive, errno, 3118 "Can't set UID=%jd", (intmax_t)a->uid); 3119 return (ARCHIVE_WARN); 3120 } 3121#endif 3122 3123#ifdef HAVE_FCHOWN 3124 /* If we have an fd, we can avoid a race. */ 3125 if (a->fd >= 0 && fchown(a->fd, a->uid, a->gid) == 0) { 3126 /* We've set owner and know uid/gid are correct. */ 3127 a->todo &= ~(TODO_OWNER | TODO_SGID_CHECK | TODO_SUID_CHECK); 3128 return (ARCHIVE_OK); 3129 } 3130#endif 3131 3132 /* We prefer lchown() but will use chown() if that's all we have. */ 3133 /* Of course, if we have neither, this will always fail. */ 3134#ifdef HAVE_LCHOWN 3135 if (lchown(a->name, a->uid, a->gid) == 0) { 3136 /* We've set owner and know uid/gid are correct. */ 3137 a->todo &= ~(TODO_OWNER | TODO_SGID_CHECK | TODO_SUID_CHECK); 3138 return (ARCHIVE_OK); 3139 } 3140#elif HAVE_CHOWN 3141 if (!S_ISLNK(a->mode) && chown(a->name, a->uid, a->gid) == 0) { 3142 /* We've set owner and know uid/gid are correct. */ 3143 a->todo &= ~(TODO_OWNER | TODO_SGID_CHECK | TODO_SUID_CHECK); 3144 return (ARCHIVE_OK); 3145 } 3146#endif 3147 3148 archive_set_error(&a->archive, errno, 3149 "Can't set user=%jd/group=%jd for %s", 3150 (intmax_t)a->uid, (intmax_t)a->gid, a->name); 3151 return (ARCHIVE_WARN); 3152} 3153 3154/* 3155 * Note: Returns 0 on success, non-zero on failure. 3156 */ 3157static int 3158set_time(int fd, int mode, const char *name, 3159 time_t atime, long atime_nsec, 3160 time_t mtime, long mtime_nsec) 3161{ 3162 /* Select the best implementation for this platform. */ 3163#if defined(HAVE_UTIMENSAT) && defined(HAVE_FUTIMENS) 3164 /* 3165 * utimensat() and futimens() are defined in 3166 * POSIX.1-2008. They support ns resolution and setting times 3167 * on fds and symlinks. 3168 */ 3169 struct timespec ts[2]; 3170 (void)mode; /* UNUSED */ 3171 ts[0].tv_sec = atime; 3172 ts[0].tv_nsec = atime_nsec; 3173 ts[1].tv_sec = mtime; 3174 ts[1].tv_nsec = mtime_nsec; 3175 if (fd >= 0) 3176 return futimens(fd, ts); 3177 return utimensat(AT_FDCWD, name, ts, AT_SYMLINK_NOFOLLOW); 3178 3179#elif HAVE_UTIMES 3180 /* 3181 * The utimes()-family functions support ��s-resolution and 3182 * setting times fds and symlinks. utimes() is documented as 3183 * LEGACY by POSIX, futimes() and lutimes() are not described 3184 * in POSIX. 3185 */ 3186 struct timeval times[2]; 3187 3188 times[0].tv_sec = atime; 3189 times[0].tv_usec = atime_nsec / 1000; 3190 times[1].tv_sec = mtime; 3191 times[1].tv_usec = mtime_nsec / 1000; 3192 3193#ifdef HAVE_FUTIMES 3194 if (fd >= 0) 3195 return (futimes(fd, times)); 3196#else 3197 (void)fd; /* UNUSED */ 3198#endif 3199#ifdef HAVE_LUTIMES 3200 (void)mode; /* UNUSED */ 3201 return (lutimes(name, times)); 3202#else 3203 if (S_ISLNK(mode)) 3204 return (0); 3205 return (utimes(name, times)); 3206#endif 3207 3208#elif defined(HAVE_UTIME) 3209 /* 3210 * utime() is POSIX-standard but only supports 1s resolution and 3211 * does not support fds or symlinks. 3212 */ 3213 struct utimbuf times; 3214 (void)fd; /* UNUSED */ 3215 (void)name; /* UNUSED */ 3216 (void)atime_nsec; /* UNUSED */ 3217 (void)mtime_nsec; /* UNUSED */ 3218 times.actime = atime; 3219 times.modtime = mtime; 3220 if (S_ISLNK(mode)) 3221 return (ARCHIVE_OK); 3222 return (utime(name, ×)); 3223 3224#else 3225 /* 3226 * We don't know how to set the time on this platform. 3227 */ 3228 (void)fd; /* UNUSED */ 3229 (void)mode; /* UNUSED */ 3230 (void)name; /* UNUSED */ 3231 (void)atime_nsec; /* UNUSED */ 3232 (void)mtime_nsec; /* UNUSED */ 3233 return (ARCHIVE_WARN); 3234#endif 3235} 3236 3237#ifdef F_SETTIMES 3238static int 3239set_time_tru64(int fd, int mode, const char *name, 3240 time_t atime, long atime_nsec, 3241 time_t mtime, long mtime_nsec, 3242 time_t ctime, long ctime_nsec) 3243{ 3244 struct attr_timbuf tstamp; 3245 tstamp.atime.tv_sec = atime; 3246 tstamp.mtime.tv_sec = mtime; 3247 tstamp.ctime.tv_sec = ctime; 3248#if defined (__hpux) && defined (__ia64) 3249 tstamp.atime.tv_nsec = atime_nsec; 3250 tstamp.mtime.tv_nsec = mtime_nsec; 3251 tstamp.ctime.tv_nsec = ctime_nsec; 3252#else 3253 tstamp.atime.tv_usec = atime_nsec / 1000; 3254 tstamp.mtime.tv_usec = mtime_nsec / 1000; 3255 tstamp.ctime.tv_usec = ctime_nsec / 1000; 3256#endif 3257 return (fcntl(fd,F_SETTIMES,&tstamp)); 3258} 3259#endif /* F_SETTIMES */ 3260 3261static int 3262set_times(struct archive_write_disk *a, 3263 int fd, int mode, const char *name, 3264 time_t atime, long atime_nanos, 3265 time_t birthtime, long birthtime_nanos, 3266 time_t mtime, long mtime_nanos, 3267 time_t cctime, long ctime_nanos) 3268{ 3269 /* Note: set_time doesn't use libarchive return conventions! 3270 * It uses syscall conventions. So 0 here instead of ARCHIVE_OK. */ 3271 int r1 = 0, r2 = 0; 3272 3273#ifdef F_SETTIMES 3274 /* 3275 * on Tru64 try own fcntl first which can restore even the 3276 * ctime, fall back to default code path below if it fails 3277 * or if we are not running as root 3278 */ 3279 if (a->user_uid == 0 && 3280 set_time_tru64(fd, mode, name, 3281 atime, atime_nanos, mtime, 3282 mtime_nanos, cctime, ctime_nanos) == 0) { 3283 return (ARCHIVE_OK); 3284 } 3285#else /* Tru64 */ 3286 (void)cctime; /* UNUSED */ 3287 (void)ctime_nanos; /* UNUSED */ 3288#endif /* Tru64 */ 3289 3290#ifdef HAVE_STRUCT_STAT_ST_BIRTHTIME 3291 /* 3292 * If you have struct stat.st_birthtime, we assume BSD 3293 * birthtime semantics, in which {f,l,}utimes() updates 3294 * birthtime to earliest mtime. So we set the time twice, 3295 * first using the birthtime, then using the mtime. If 3296 * birthtime == mtime, this isn't necessary, so we skip it. 3297 * If birthtime > mtime, then this won't work, so we skip it. 3298 */ 3299 if (birthtime < mtime 3300 || (birthtime == mtime && birthtime_nanos < mtime_nanos)) 3301 r1 = set_time(fd, mode, name, 3302 atime, atime_nanos, 3303 birthtime, birthtime_nanos); 3304#else 3305 (void)birthtime; /* UNUSED */ 3306 (void)birthtime_nanos; /* UNUSED */ 3307#endif 3308 r2 = set_time(fd, mode, name, 3309 atime, atime_nanos, 3310 mtime, mtime_nanos); 3311 if (r1 != 0 || r2 != 0) { 3312 archive_set_error(&a->archive, errno, 3313 "Can't restore time"); 3314 return (ARCHIVE_WARN); 3315 } 3316 return (ARCHIVE_OK); 3317} 3318 3319static int 3320set_times_from_entry(struct archive_write_disk *a) 3321{ 3322 time_t atime, birthtime, mtime, cctime; 3323 long atime_nsec, birthtime_nsec, mtime_nsec, ctime_nsec; 3324 3325 /* Suitable defaults. */ 3326 atime = birthtime = mtime = cctime = a->start_time; 3327 atime_nsec = birthtime_nsec = mtime_nsec = ctime_nsec = 0; 3328 3329 /* If no time was provided, we're done. */ 3330 if (!archive_entry_atime_is_set(a->entry) 3331#if HAVE_STRUCT_STAT_ST_BIRTHTIME 3332 && !archive_entry_birthtime_is_set(a->entry) 3333#endif 3334 && !archive_entry_mtime_is_set(a->entry)) 3335 return (ARCHIVE_OK); 3336 3337 if (archive_entry_atime_is_set(a->entry)) { 3338 atime = archive_entry_atime(a->entry); 3339 atime_nsec = archive_entry_atime_nsec(a->entry); 3340 } 3341 if (archive_entry_birthtime_is_set(a->entry)) { 3342 birthtime = archive_entry_birthtime(a->entry); 3343 birthtime_nsec = archive_entry_birthtime_nsec(a->entry); 3344 } 3345 if (archive_entry_mtime_is_set(a->entry)) { 3346 mtime = archive_entry_mtime(a->entry); 3347 mtime_nsec = archive_entry_mtime_nsec(a->entry); 3348 } 3349 if (archive_entry_ctime_is_set(a->entry)) { 3350 cctime = archive_entry_ctime(a->entry); 3351 ctime_nsec = archive_entry_ctime_nsec(a->entry); 3352 } 3353 3354 return set_times(a, a->fd, a->mode, a->name, 3355 atime, atime_nsec, 3356 birthtime, birthtime_nsec, 3357 mtime, mtime_nsec, 3358 cctime, ctime_nsec); 3359} 3360 3361static int 3362set_mode(struct archive_write_disk *a, int mode) 3363{ 3364 int r = ARCHIVE_OK; 3365 mode &= 07777; /* Strip off file type bits. */ 3366 3367 if (a->todo & TODO_SGID_CHECK) { 3368 /* 3369 * If we don't know the GID is right, we must stat() 3370 * to verify it. We can't just check the GID of this 3371 * process, since systems sometimes set GID from 3372 * the enclosing dir or based on ACLs. 3373 */ 3374 if ((r = lazy_stat(a)) != ARCHIVE_OK) 3375 return (r); 3376 if (a->pst->st_gid != a->gid) { 3377 mode &= ~ S_ISGID; 3378 if (a->flags & ARCHIVE_EXTRACT_OWNER) { 3379 /* 3380 * This is only an error if you 3381 * requested owner restore. If you 3382 * didn't, we'll try to restore 3383 * sgid/suid, but won't consider it a 3384 * problem if we can't. 3385 */ 3386 archive_set_error(&a->archive, -1, 3387 "Can't restore SGID bit"); 3388 r = ARCHIVE_WARN; 3389 } 3390 } 3391 /* While we're here, double-check the UID. */ 3392 if (a->pst->st_uid != a->uid 3393 && (a->todo & TODO_SUID)) { 3394 mode &= ~ S_ISUID; 3395 if (a->flags & ARCHIVE_EXTRACT_OWNER) { 3396 archive_set_error(&a->archive, -1, 3397 "Can't restore SUID bit"); 3398 r = ARCHIVE_WARN; 3399 } 3400 } 3401 a->todo &= ~TODO_SGID_CHECK; 3402 a->todo &= ~TODO_SUID_CHECK; 3403 } else if (a->todo & TODO_SUID_CHECK) { 3404 /* 3405 * If we don't know the UID is right, we can just check 3406 * the user, since all systems set the file UID from 3407 * the process UID. 3408 */ 3409 if (a->user_uid != a->uid) { 3410 mode &= ~ S_ISUID; 3411 if (a->flags & ARCHIVE_EXTRACT_OWNER) { 3412 archive_set_error(&a->archive, -1, 3413 "Can't make file SUID"); 3414 r = ARCHIVE_WARN; 3415 } 3416 } 3417 a->todo &= ~TODO_SUID_CHECK; 3418 } 3419 3420 if (S_ISLNK(a->mode)) { 3421#ifdef HAVE_LCHMOD 3422 /* 3423 * If this is a symlink, use lchmod(). If the 3424 * platform doesn't support lchmod(), just skip it. A 3425 * platform that doesn't provide a way to set 3426 * permissions on symlinks probably ignores 3427 * permissions on symlinks, so a failure here has no 3428 * impact. 3429 */ 3430 if (lchmod(a->name, mode) != 0) { 3431 switch (errno) { 3432 case ENOTSUP: 3433 case ENOSYS: 3434#if ENOTSUP != EOPNOTSUPP 3435 case EOPNOTSUPP: 3436#endif 3437 /* 3438 * if lchmod is defined but the platform 3439 * doesn't support it, silently ignore 3440 * error 3441 */ 3442 break; 3443 default: 3444 archive_set_error(&a->archive, errno, 3445 "Can't set permissions to 0%o", (int)mode); 3446 r = ARCHIVE_WARN; 3447 } 3448 } 3449#endif 3450 } else if (!S_ISDIR(a->mode)) { 3451 /* 3452 * If it's not a symlink and not a dir, then use 3453 * fchmod() or chmod(), depending on whether we have 3454 * an fd. Dirs get their perms set during the 3455 * post-extract fixup, which is handled elsewhere. 3456 */ 3457#ifdef HAVE_FCHMOD 3458 if (a->fd >= 0) { 3459 if (fchmod(a->fd, mode) != 0) { 3460 archive_set_error(&a->archive, errno, 3461 "Can't set permissions to 0%o", (int)mode); 3462 r = ARCHIVE_WARN; 3463 } 3464 } else 3465#endif 3466 /* If this platform lacks fchmod(), then 3467 * we'll just use chmod(). */ 3468 if (chmod(a->name, mode) != 0) { 3469 archive_set_error(&a->archive, errno, 3470 "Can't set permissions to 0%o", (int)mode); 3471 r = ARCHIVE_WARN; 3472 } 3473 } 3474 return (r); 3475} 3476 3477static int 3478set_fflags(struct archive_write_disk *a) 3479{ 3480 struct fixup_entry *le; 3481 unsigned long set, clear; 3482 int r; 3483 mode_t mode = archive_entry_mode(a->entry); 3484 /* 3485 * Make 'critical_flags' hold all file flags that can't be 3486 * immediately restored. For example, on BSD systems, 3487 * SF_IMMUTABLE prevents hardlinks from being created, so 3488 * should not be set until after any hardlinks are created. To 3489 * preserve some semblance of portability, this uses #ifdef 3490 * extensively. Ugly, but it works. 3491 * 3492 * Yes, Virginia, this does create a security race. It's mitigated 3493 * somewhat by the practice of creating dirs 0700 until the extract 3494 * is done, but it would be nice if we could do more than that. 3495 * People restoring critical file systems should be wary of 3496 * other programs that might try to muck with files as they're 3497 * being restored. 3498 */ 3499 const int critical_flags = 0 3500#ifdef SF_IMMUTABLE 3501 | SF_IMMUTABLE 3502#endif 3503#ifdef UF_IMMUTABLE 3504 | UF_IMMUTABLE 3505#endif 3506#ifdef SF_APPEND 3507 | SF_APPEND 3508#endif 3509#ifdef UF_APPEND 3510 | UF_APPEND 3511#endif 3512#if defined(FS_APPEND_FL) 3513 | FS_APPEND_FL 3514#elif defined(EXT2_APPEND_FL) 3515 | EXT2_APPEND_FL 3516#endif 3517#if defined(FS_IMMUTABLE_FL) 3518 | FS_IMMUTABLE_FL 3519#elif defined(EXT2_IMMUTABLE_FL) 3520 | EXT2_IMMUTABLE_FL 3521#endif 3522#ifdef FS_JOURNAL_DATA_FL 3523 | FS_JOURNAL_DATA_FL 3524#endif 3525 ; 3526 3527 if (a->todo & TODO_FFLAGS) { 3528 archive_entry_fflags(a->entry, &set, &clear); 3529 3530 /* 3531 * The first test encourages the compiler to eliminate 3532 * all of this if it's not necessary. 3533 */ 3534 if ((critical_flags != 0) && (set & critical_flags)) { 3535 le = current_fixup(a, a->name); 3536 if (le == NULL) 3537 return (ARCHIVE_FATAL); 3538 le->fixup |= TODO_FFLAGS; 3539 le->fflags_set = set; 3540 /* Store the mode if it's not already there. */ 3541 if ((le->fixup & TODO_MODE) == 0) 3542 le->mode = mode; 3543 } else { 3544 r = set_fflags_platform(a, a->fd, 3545 a->name, mode, set, clear); 3546 if (r != ARCHIVE_OK) 3547 return (r); 3548 } 3549 } 3550 return (ARCHIVE_OK); 3551} 3552 3553static int 3554clear_nochange_fflags(struct archive_write_disk *a) 3555{ 3556 mode_t mode = archive_entry_mode(a->entry); 3557 const int nochange_flags = 0 3558#ifdef SF_IMMUTABLE 3559 | SF_IMMUTABLE 3560#endif 3561#ifdef UF_IMMUTABLE 3562 | UF_IMMUTABLE 3563#endif 3564#ifdef SF_APPEND 3565 | SF_APPEND 3566#endif 3567#ifdef UF_APPEND 3568 | UF_APPEND 3569#endif 3570#ifdef EXT2_APPEND_FL 3571 | EXT2_APPEND_FL 3572#endif 3573#ifdef EXT2_IMMUTABLE_FL 3574 | EXT2_IMMUTABLE_FL 3575#endif 3576 ; 3577 3578 return (set_fflags_platform(a, a->fd, a->name, mode, 0, 3579 nochange_flags)); 3580} 3581 3582 3583#if ( defined(HAVE_LCHFLAGS) || defined(HAVE_CHFLAGS) || defined(HAVE_FCHFLAGS) ) && defined(HAVE_STRUCT_STAT_ST_FLAGS) 3584/* 3585 * BSD reads flags using stat() and sets them with one of {f,l,}chflags() 3586 */ 3587static int 3588set_fflags_platform(struct archive_write_disk *a, int fd, const char *name, 3589 mode_t mode, unsigned long set, unsigned long clear) 3590{ 3591 int r; 3592 const int sf_mask = 0 3593#ifdef SF_APPEND 3594 | SF_APPEND 3595#endif 3596#ifdef SF_ARCHIVED 3597 | SF_ARCHIVED 3598#endif 3599#ifdef SF_IMMUTABLE 3600 | SF_IMMUTABLE 3601#endif 3602#ifdef SF_NOUNLINK 3603 | SF_NOUNLINK 3604#endif 3605 ; 3606 (void)mode; /* UNUSED */ 3607 3608 if (set == 0 && clear == 0) 3609 return (ARCHIVE_OK); 3610 3611 /* 3612 * XXX Is the stat here really necessary? Or can I just use 3613 * the 'set' flags directly? In particular, I'm not sure 3614 * about the correct approach if we're overwriting an existing 3615 * file that already has flags on it. XXX 3616 */ 3617 if ((r = lazy_stat(a)) != ARCHIVE_OK) 3618 return (r); 3619 3620 a->st.st_flags &= ~clear; 3621 a->st.st_flags |= set; 3622 3623 /* Only super-user may change SF_* flags */ 3624 3625 if (a->user_uid != 0) 3626 a->st.st_flags &= ~sf_mask; 3627 3628#ifdef HAVE_FCHFLAGS 3629 /* If platform has fchflags() and we were given an fd, use it. */ 3630 if (fd >= 0 && fchflags(fd, a->st.st_flags) == 0) 3631 return (ARCHIVE_OK); 3632#endif 3633 /* 3634 * If we can't use the fd to set the flags, we'll use the 3635 * pathname to set flags. We prefer lchflags() but will use 3636 * chflags() if we must. 3637 */ 3638#ifdef HAVE_LCHFLAGS 3639 if (lchflags(name, a->st.st_flags) == 0) 3640 return (ARCHIVE_OK); 3641#elif defined(HAVE_CHFLAGS) 3642 if (S_ISLNK(a->st.st_mode)) { 3643 archive_set_error(&a->archive, errno, 3644 "Can't set file flags on symlink."); 3645 return (ARCHIVE_WARN); 3646 } 3647 if (chflags(name, a->st.st_flags) == 0) 3648 return (ARCHIVE_OK); 3649#endif 3650 archive_set_error(&a->archive, errno, 3651 "Failed to set file flags"); 3652 return (ARCHIVE_WARN); 3653} 3654 3655#elif (defined(FS_IOC_GETFLAGS) && defined(FS_IOC_SETFLAGS) && \ 3656 defined(HAVE_WORKING_FS_IOC_GETFLAGS)) || \ 3657 (defined(EXT2_IOC_GETFLAGS) && defined(EXT2_IOC_SETFLAGS) && \ 3658 defined(HAVE_WORKING_EXT2_IOC_GETFLAGS)) 3659/* 3660 * Linux uses ioctl() to read and write file flags. 3661 */ 3662static int 3663set_fflags_platform(struct archive_write_disk *a, int fd, const char *name, 3664 mode_t mode, unsigned long set, unsigned long clear) 3665{ 3666 int ret; 3667 int myfd = fd; 3668 int newflags, oldflags; 3669 /* 3670 * Linux has no define for the flags that are only settable by 3671 * the root user. This code may seem a little complex, but 3672 * there seem to be some Linux systems that lack these 3673 * defines. (?) The code below degrades reasonably gracefully 3674 * if sf_mask is incomplete. 3675 */ 3676 const int sf_mask = 0 3677#if defined(FS_IMMUTABLE_FL) 3678 | FS_IMMUTABLE_FL 3679#elif defined(EXT2_IMMUTABLE_FL) 3680 | EXT2_IMMUTABLE_FL 3681#endif 3682#if defined(FS_APPEND_FL) 3683 | FS_APPEND_FL 3684#elif defined(EXT2_APPEND_FL) 3685 | EXT2_APPEND_FL 3686#endif 3687#if defined(FS_JOURNAL_DATA_FL) 3688 | FS_JOURNAL_DATA_FL 3689#endif 3690 ; 3691 3692 if (set == 0 && clear == 0) 3693 return (ARCHIVE_OK); 3694 /* Only regular files and dirs can have flags. */ 3695 if (!S_ISREG(mode) && !S_ISDIR(mode)) 3696 return (ARCHIVE_OK); 3697 3698 /* If we weren't given an fd, open it ourselves. */ 3699 if (myfd < 0) { 3700 myfd = open(name, O_RDONLY | O_NONBLOCK | O_BINARY | O_CLOEXEC); 3701 __archive_ensure_cloexec_flag(myfd); 3702 } 3703 if (myfd < 0) 3704 return (ARCHIVE_OK); 3705 3706 /* 3707 * XXX As above, this would be way simpler if we didn't have 3708 * to read the current flags from disk. XXX 3709 */ 3710 ret = ARCHIVE_OK; 3711 3712 /* Read the current file flags. */ 3713 if (ioctl(myfd, 3714#ifdef FS_IOC_GETFLAGS 3715 FS_IOC_GETFLAGS, 3716#else 3717 EXT2_IOC_GETFLAGS, 3718#endif 3719 &oldflags) < 0) 3720 goto fail; 3721 3722 /* Try setting the flags as given. */ 3723 newflags = (oldflags & ~clear) | set; 3724 if (ioctl(myfd, 3725#ifdef FS_IOC_SETFLAGS 3726 FS_IOC_SETFLAGS, 3727#else 3728 EXT2_IOC_SETFLAGS, 3729#endif 3730 &newflags) >= 0) 3731 goto cleanup; 3732 if (errno != EPERM) 3733 goto fail; 3734 3735 /* If we couldn't set all the flags, try again with a subset. */ 3736 newflags &= ~sf_mask; 3737 oldflags &= sf_mask; 3738 newflags |= oldflags; 3739 if (ioctl(myfd, 3740#ifdef FS_IOC_SETFLAGS 3741 FS_IOC_SETFLAGS, 3742#else 3743 EXT2_IOC_SETFLAGS, 3744#endif 3745 &newflags) >= 0) 3746 goto cleanup; 3747 3748 /* We couldn't set the flags, so report the failure. */ 3749fail: 3750 archive_set_error(&a->archive, errno, 3751 "Failed to set file flags"); 3752 ret = ARCHIVE_WARN; 3753cleanup: 3754 if (fd < 0) 3755 close(myfd); 3756 return (ret); 3757} 3758 3759#else 3760 3761/* 3762 * Of course, some systems have neither BSD chflags() nor Linux' flags 3763 * support through ioctl(). 3764 */ 3765static int 3766set_fflags_platform(struct archive_write_disk *a, int fd, const char *name, 3767 mode_t mode, unsigned long set, unsigned long clear) 3768{ 3769 (void)a; /* UNUSED */ 3770 (void)fd; /* UNUSED */ 3771 (void)name; /* UNUSED */ 3772 (void)mode; /* UNUSED */ 3773 (void)set; /* UNUSED */ 3774 (void)clear; /* UNUSED */ 3775 return (ARCHIVE_OK); 3776} 3777 3778#endif /* __linux */ 3779 3780#ifndef HAVE_COPYFILE_H 3781/* Default is to simply drop Mac extended metadata. */ 3782static int 3783set_mac_metadata(struct archive_write_disk *a, const char *pathname, 3784 const void *metadata, size_t metadata_size) 3785{ 3786 (void)a; /* UNUSED */ 3787 (void)pathname; /* UNUSED */ 3788 (void)metadata; /* UNUSED */ 3789 (void)metadata_size; /* UNUSED */ 3790 return (ARCHIVE_OK); 3791} 3792 3793static int 3794fixup_appledouble(struct archive_write_disk *a, const char *pathname) 3795{ 3796 (void)a; /* UNUSED */ 3797 (void)pathname; /* UNUSED */ 3798 return (ARCHIVE_OK); 3799} 3800#else 3801 3802/* 3803 * On Mac OS, we use copyfile() to unpack the metadata and 3804 * apply it to the target file. 3805 */ 3806 3807#if defined(HAVE_SYS_XATTR_H) 3808static int 3809copy_xattrs(struct archive_write_disk *a, int tmpfd, int dffd) 3810{ 3811 ssize_t xattr_size; 3812 char *xattr_names = NULL, *xattr_val = NULL; 3813 int ret = ARCHIVE_OK, xattr_i; 3814 3815 xattr_size = flistxattr(tmpfd, NULL, 0, 0); 3816 if (xattr_size == -1) { 3817 archive_set_error(&a->archive, errno, 3818 "Failed to read metadata(xattr)"); 3819 ret = ARCHIVE_WARN; 3820 goto exit_xattr; 3821 } 3822 xattr_names = malloc(xattr_size); 3823 if (xattr_names == NULL) { 3824 archive_set_error(&a->archive, ENOMEM, 3825 "Can't allocate memory for metadata(xattr)"); 3826 ret = ARCHIVE_FATAL; 3827 goto exit_xattr; 3828 } 3829 xattr_size = flistxattr(tmpfd, xattr_names, xattr_size, 0); 3830 if (xattr_size == -1) { 3831 archive_set_error(&a->archive, errno, 3832 "Failed to read metadata(xattr)"); 3833 ret = ARCHIVE_WARN; 3834 goto exit_xattr; 3835 } 3836 for (xattr_i = 0; xattr_i < xattr_size; 3837 xattr_i += strlen(xattr_names + xattr_i) + 1) { 3838 char *xattr_val_saved; 3839 ssize_t s; 3840 int f; 3841 3842 s = fgetxattr(tmpfd, xattr_names + xattr_i, NULL, 0, 0, 0); 3843 if (s == -1) { 3844 archive_set_error(&a->archive, errno, 3845 "Failed to get metadata(xattr)"); 3846 ret = ARCHIVE_WARN; 3847 goto exit_xattr; 3848 } 3849 xattr_val_saved = xattr_val; 3850 xattr_val = realloc(xattr_val, s); 3851 if (xattr_val == NULL) { 3852 archive_set_error(&a->archive, ENOMEM, 3853 "Failed to get metadata(xattr)"); 3854 ret = ARCHIVE_WARN; 3855 free(xattr_val_saved); 3856 goto exit_xattr; 3857 } 3858 s = fgetxattr(tmpfd, xattr_names + xattr_i, xattr_val, s, 0, 0); 3859 if (s == -1) { 3860 archive_set_error(&a->archive, errno, 3861 "Failed to get metadata(xattr)"); 3862 ret = ARCHIVE_WARN; 3863 goto exit_xattr; 3864 } 3865 f = fsetxattr(dffd, xattr_names + xattr_i, xattr_val, s, 0, 0); 3866 if (f == -1) { 3867 archive_set_error(&a->archive, errno, 3868 "Failed to get metadata(xattr)"); 3869 ret = ARCHIVE_WARN; 3870 goto exit_xattr; 3871 } 3872 } 3873exit_xattr: 3874 free(xattr_names); 3875 free(xattr_val); 3876 return (ret); 3877} 3878#endif 3879 3880static int 3881copy_acls(struct archive_write_disk *a, int tmpfd, int dffd) 3882{ 3883#ifndef HAVE_SYS_ACL_H 3884 return 0; 3885#else 3886 acl_t acl, dfacl = NULL; 3887 int acl_r, ret = ARCHIVE_OK; 3888 3889 acl = acl_get_fd(tmpfd); 3890 if (acl == NULL) { 3891 if (errno == ENOENT) 3892 /* There are not any ACLs. */ 3893 return (ret); 3894 archive_set_error(&a->archive, errno, 3895 "Failed to get metadata(acl)"); 3896 ret = ARCHIVE_WARN; 3897 goto exit_acl; 3898 } 3899 dfacl = acl_dup(acl); 3900 acl_r = acl_set_fd(dffd, dfacl); 3901 if (acl_r == -1) { 3902 archive_set_error(&a->archive, errno, 3903 "Failed to get metadata(acl)"); 3904 ret = ARCHIVE_WARN; 3905 goto exit_acl; 3906 } 3907exit_acl: 3908 if (acl) 3909 acl_free(acl); 3910 if (dfacl) 3911 acl_free(dfacl); 3912 return (ret); 3913#endif 3914} 3915 3916static int 3917create_tempdatafork(struct archive_write_disk *a, const char *pathname) 3918{ 3919 struct archive_string tmpdatafork; 3920 int tmpfd; 3921 3922 archive_string_init(&tmpdatafork); 3923 archive_strcpy(&tmpdatafork, "tar.md.XXXXXX"); 3924 tmpfd = mkstemp(tmpdatafork.s); 3925 if (tmpfd < 0) { 3926 archive_set_error(&a->archive, errno, 3927 "Failed to mkstemp"); 3928 archive_string_free(&tmpdatafork); 3929 return (-1); 3930 } 3931 if (copyfile(pathname, tmpdatafork.s, 0, 3932 COPYFILE_UNPACK | COPYFILE_NOFOLLOW 3933 | COPYFILE_ACL | COPYFILE_XATTR) < 0) { 3934 archive_set_error(&a->archive, errno, 3935 "Failed to restore metadata"); 3936 close(tmpfd); 3937 tmpfd = -1; 3938 } 3939 unlink(tmpdatafork.s); 3940 archive_string_free(&tmpdatafork); 3941 return (tmpfd); 3942} 3943 3944static int 3945copy_metadata(struct archive_write_disk *a, const char *metadata, 3946 const char *datafork, int datafork_compressed) 3947{ 3948 int ret = ARCHIVE_OK; 3949 3950 if (datafork_compressed) { 3951 int dffd, tmpfd; 3952 3953 tmpfd = create_tempdatafork(a, metadata); 3954 if (tmpfd == -1) 3955 return (ARCHIVE_WARN); 3956 3957 /* 3958 * Do not open the data fork compressed by HFS+ compression 3959 * with at least a writing mode(O_RDWR or O_WRONLY). it 3960 * makes the data fork uncompressed. 3961 */ 3962 dffd = open(datafork, 0); 3963 if (dffd == -1) { 3964 archive_set_error(&a->archive, errno, 3965 "Failed to open the data fork for metadata"); 3966 close(tmpfd); 3967 return (ARCHIVE_WARN); 3968 } 3969 3970#if defined(HAVE_SYS_XATTR_H) 3971 ret = copy_xattrs(a, tmpfd, dffd); 3972 if (ret == ARCHIVE_OK) 3973#endif 3974 ret = copy_acls(a, tmpfd, dffd); 3975 close(tmpfd); 3976 close(dffd); 3977 } else { 3978 if (copyfile(metadata, datafork, 0, 3979 COPYFILE_UNPACK | COPYFILE_NOFOLLOW 3980 | COPYFILE_ACL | COPYFILE_XATTR) < 0) { 3981 archive_set_error(&a->archive, errno, 3982 "Failed to restore metadata"); 3983 ret = ARCHIVE_WARN; 3984 } 3985 } 3986 return (ret); 3987} 3988 3989static int 3990set_mac_metadata(struct archive_write_disk *a, const char *pathname, 3991 const void *metadata, size_t metadata_size) 3992{ 3993 struct archive_string tmp; 3994 ssize_t written; 3995 int fd; 3996 int ret = ARCHIVE_OK; 3997 3998 /* This would be simpler if copyfile() could just accept the 3999 * metadata as a block of memory; then we could sidestep this 4000 * silly dance of writing the data to disk just so that 4001 * copyfile() can read it back in again. */ 4002 archive_string_init(&tmp); 4003 archive_strcpy(&tmp, pathname); 4004 archive_strcat(&tmp, ".XXXXXX"); 4005 fd = mkstemp(tmp.s); 4006 4007 if (fd < 0) { 4008 archive_set_error(&a->archive, errno, 4009 "Failed to restore metadata"); 4010 archive_string_free(&tmp); 4011 return (ARCHIVE_WARN); 4012 } 4013 written = write(fd, metadata, metadata_size); 4014 close(fd); 4015 if ((size_t)written != metadata_size) { 4016 archive_set_error(&a->archive, errno, 4017 "Failed to restore metadata"); 4018 ret = ARCHIVE_WARN; 4019 } else { 4020 int compressed; 4021 4022#if defined(UF_COMPRESSED) 4023 if ((a->todo & TODO_HFS_COMPRESSION) != 0 && 4024 (ret = lazy_stat(a)) == ARCHIVE_OK) 4025 compressed = a->st.st_flags & UF_COMPRESSED; 4026 else 4027#endif 4028 compressed = 0; 4029 ret = copy_metadata(a, tmp.s, pathname, compressed); 4030 } 4031 unlink(tmp.s); 4032 archive_string_free(&tmp); 4033 return (ret); 4034} 4035 4036static int 4037fixup_appledouble(struct archive_write_disk *a, const char *pathname) 4038{ 4039 char buff[8]; 4040 struct stat st; 4041 const char *p; 4042 struct archive_string datafork; 4043 int fd = -1, ret = ARCHIVE_OK; 4044 4045 archive_string_init(&datafork); 4046 /* Check if the current file name is a type of the resource 4047 * fork file. */ 4048 p = strrchr(pathname, '/'); 4049 if (p == NULL) 4050 p = pathname; 4051 else 4052 p++; 4053 if (p[0] != '.' || p[1] != '_') 4054 goto skip_appledouble; 4055 4056 /* 4057 * Check if the data fork file exists. 4058 * 4059 * TODO: Check if this write disk object has handled it. 4060 */ 4061 archive_strncpy(&datafork, pathname, p - pathname); 4062 archive_strcat(&datafork, p + 2); 4063 if (lstat(datafork.s, &st) == -1 || 4064 (st.st_mode & AE_IFMT) != AE_IFREG) 4065 goto skip_appledouble; 4066 4067 /* 4068 * Check if the file is in the AppleDouble form. 4069 */ 4070 fd = open(pathname, O_RDONLY | O_BINARY | O_CLOEXEC); 4071 __archive_ensure_cloexec_flag(fd); 4072 if (fd == -1) { 4073 archive_set_error(&a->archive, errno, 4074 "Failed to open a restoring file"); 4075 ret = ARCHIVE_WARN; 4076 goto skip_appledouble; 4077 } 4078 if (read(fd, buff, 8) == -1) { 4079 archive_set_error(&a->archive, errno, 4080 "Failed to read a restoring file"); 4081 close(fd); 4082 ret = ARCHIVE_WARN; 4083 goto skip_appledouble; 4084 } 4085 close(fd); 4086 /* Check AppleDouble Magic Code. */ 4087 if (archive_be32dec(buff) != 0x00051607) 4088 goto skip_appledouble; 4089 /* Check AppleDouble Version. */ 4090 if (archive_be32dec(buff+4) != 0x00020000) 4091 goto skip_appledouble; 4092 4093 ret = copy_metadata(a, pathname, datafork.s, 4094#if defined(UF_COMPRESSED) 4095 st.st_flags & UF_COMPRESSED); 4096#else 4097 0); 4098#endif 4099 if (ret == ARCHIVE_OK) { 4100 unlink(pathname); 4101 ret = ARCHIVE_EOF; 4102 } 4103skip_appledouble: 4104 archive_string_free(&datafork); 4105 return (ret); 4106} 4107#endif 4108 4109#if ARCHIVE_XATTR_LINUX || ARCHIVE_XATTR_DARWIN || ARCHIVE_XATTR_AIX 4110/* 4111 * Restore extended attributes - Linux, Darwin and AIX implementations: 4112 * AIX' ea interface is syntaxwise identical to the Linux xattr interface. 4113 */ 4114static int 4115set_xattrs(struct archive_write_disk *a) 4116{ 4117 struct archive_entry *entry = a->entry; 4118 static int warning_done = 0; 4119 int ret = ARCHIVE_OK; 4120 int i = archive_entry_xattr_reset(entry); 4121 4122 while (i--) { 4123 const char *name; 4124 const void *value; 4125 size_t size; 4126 archive_entry_xattr_next(entry, &name, &value, &size); 4127 if (name != NULL && 4128 strncmp(name, "xfsroot.", 8) != 0 && 4129 strncmp(name, "system.", 7) != 0) { 4130 int e; 4131 if (a->fd >= 0) { 4132#if ARCHIVE_XATTR_LINUX 4133 e = fsetxattr(a->fd, name, value, size, 0); 4134#elif ARCHIVE_XATTR_DARWIN 4135 e = fsetxattr(a->fd, name, value, size, 0, 0); 4136#elif ARCHIVE_XATTR_AIX 4137 e = fsetea(a->fd, name, value, size, 0); 4138#endif 4139 } else { 4140#if ARCHIVE_XATTR_LINUX 4141 e = lsetxattr(archive_entry_pathname(entry), 4142 name, value, size, 0); 4143#elif ARCHIVE_XATTR_DARWIN 4144 e = setxattr(archive_entry_pathname(entry), 4145 name, value, size, 0, XATTR_NOFOLLOW); 4146#elif ARCHIVE_XATTR_AIX 4147 e = lsetea(archive_entry_pathname(entry), 4148 name, value, size, 0); 4149#endif 4150 } 4151 if (e == -1) { 4152 if (errno == ENOTSUP || errno == ENOSYS) { 4153 if (!warning_done) { 4154 warning_done = 1; 4155 archive_set_error(&a->archive, 4156 errno, 4157 "Cannot restore extended " 4158 "attributes on this file " 4159 "system"); 4160 } 4161 } else 4162 archive_set_error(&a->archive, errno, 4163 "Failed to set extended attribute"); 4164 ret = ARCHIVE_WARN; 4165 } 4166 } else { 4167 archive_set_error(&a->archive, 4168 ARCHIVE_ERRNO_FILE_FORMAT, 4169 "Invalid extended attribute encountered"); 4170 ret = ARCHIVE_WARN; 4171 } 4172 } 4173 return (ret); 4174} 4175#elif ARCHIVE_XATTR_FREEBSD 4176/* 4177 * Restore extended attributes - FreeBSD implementation 4178 */ 4179static int 4180set_xattrs(struct archive_write_disk *a) 4181{ 4182 struct archive_entry *entry = a->entry; 4183 static int warning_done = 0; 4184 int ret = ARCHIVE_OK; 4185 int i = archive_entry_xattr_reset(entry); 4186 4187 while (i--) { 4188 const char *name; 4189 const void *value; 4190 size_t size; 4191 archive_entry_xattr_next(entry, &name, &value, &size); 4192 if (name != NULL) { 4193 ssize_t e; 4194 int namespace; 4195 4196 if (strncmp(name, "user.", 5) == 0) { 4197 /* "user." attributes go to user namespace */ 4198 name += 5; 4199 namespace = EXTATTR_NAMESPACE_USER; 4200 } else { 4201 /* Warn about other extended attributes. */ 4202 archive_set_error(&a->archive, 4203 ARCHIVE_ERRNO_FILE_FORMAT, 4204 "Can't restore extended attribute ``%s''", 4205 name); 4206 ret = ARCHIVE_WARN; 4207 continue; 4208 } 4209 errno = 0; 4210 4211 if (a->fd >= 0) { 4212 e = extattr_set_fd(a->fd, namespace, name, 4213 value, size); 4214 } else { 4215 e = extattr_set_link( 4216 archive_entry_pathname(entry), namespace, 4217 name, value, size); 4218 } 4219 if (e != (ssize_t)size) { 4220 if (errno == ENOTSUP || errno == ENOSYS) { 4221 if (!warning_done) { 4222 warning_done = 1; 4223 archive_set_error(&a->archive, 4224 errno, 4225 "Cannot restore extended " 4226 "attributes on this file " 4227 "system"); 4228 } 4229 } else { 4230 archive_set_error(&a->archive, errno, 4231 "Failed to set extended attribute"); 4232 } 4233 4234 ret = ARCHIVE_WARN; 4235 } 4236 } 4237 } 4238 return (ret); 4239} 4240#else 4241/* 4242 * Restore extended attributes - stub implementation for unsupported systems 4243 */ 4244static int 4245set_xattrs(struct archive_write_disk *a) 4246{ 4247 static int warning_done = 0; 4248 4249 /* If there aren't any extended attributes, then it's okay not 4250 * to extract them, otherwise, issue a single warning. */ 4251 if (archive_entry_xattr_count(a->entry) != 0 && !warning_done) { 4252 warning_done = 1; 4253 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 4254 "Cannot restore extended attributes on this system"); 4255 return (ARCHIVE_WARN); 4256 } 4257 /* Warning was already emitted; suppress further warnings. */ 4258 return (ARCHIVE_OK); 4259} 4260#endif 4261 4262/* 4263 * Test if file on disk is older than entry. 4264 */ 4265static int 4266older(struct stat *st, struct archive_entry *entry) 4267{ 4268 /* First, test the seconds and return if we have a definite answer. */ 4269 /* Definitely older. */ 4270 if (to_int64_time(st->st_mtime) < to_int64_time(archive_entry_mtime(entry))) 4271 return (1); 4272 /* Definitely younger. */ 4273 if (to_int64_time(st->st_mtime) > to_int64_time(archive_entry_mtime(entry))) 4274 return (0); 4275 /* If this platform supports fractional seconds, try those. */ 4276#if HAVE_STRUCT_STAT_ST_MTIMESPEC_TV_NSEC 4277 /* Definitely older. */ 4278 if (st->st_mtimespec.tv_nsec < archive_entry_mtime_nsec(entry)) 4279 return (1); 4280#elif HAVE_STRUCT_STAT_ST_MTIM_TV_NSEC 4281 /* Definitely older. */ 4282 if (st->st_mtim.tv_nsec < archive_entry_mtime_nsec(entry)) 4283 return (1); 4284#elif HAVE_STRUCT_STAT_ST_MTIME_N 4285 /* older. */ 4286 if (st->st_mtime_n < archive_entry_mtime_nsec(entry)) 4287 return (1); 4288#elif HAVE_STRUCT_STAT_ST_UMTIME 4289 /* older. */ 4290 if (st->st_umtime * 1000 < archive_entry_mtime_nsec(entry)) 4291 return (1); 4292#elif HAVE_STRUCT_STAT_ST_MTIME_USEC 4293 /* older. */ 4294 if (st->st_mtime_usec * 1000 < archive_entry_mtime_nsec(entry)) 4295 return (1); 4296#else 4297 /* This system doesn't have high-res timestamps. */ 4298#endif 4299 /* Same age or newer, so not older. */ 4300 return (0); 4301} 4302 4303#ifndef ARCHIVE_ACL_SUPPORT 4304int 4305archive_write_disk_set_acls(struct archive *a, int fd, const char *name, 4306 struct archive_acl *abstract_acl, __LA_MODE_T mode) 4307{ 4308 (void)a; /* UNUSED */ 4309 (void)fd; /* UNUSED */ 4310 (void)name; /* UNUSED */ 4311 (void)abstract_acl; /* UNUSED */ 4312 (void)mode; /* UNUSED */ 4313 return (ARCHIVE_OK); 4314} 4315#endif 4316 4317#endif /* !_WIN32 || __CYGWIN__ */ 4318 4319