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cmake/Utilities/cmlibarchive/libarchive/archive_write_disk_posix.c

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/*-
* Copyright (c) 2003-2010 Tim Kientzle
* Copyright (c) 2012 Michihiro NAKAJIMA
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer
* in this position and unchanged.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "archive_platform.h"
__FBSDID("$FreeBSD$");
#if !defined(_WIN32) || defined(__CYGWIN__)
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#ifdef HAVE_SYS_ACL_H
#include <sys/acl.h>
#endif
#ifdef HAVE_SYS_EXTATTR_H
#include <sys/extattr.h>
#endif
#if HAVE_SYS_XATTR_H
#include <sys/xattr.h>
#elif HAVE_ATTR_XATTR_H
#include <attr/xattr.h>
#endif
#ifdef HAVE_SYS_EA_H
#include <sys/ea.h>
#endif
#ifdef HAVE_SYS_IOCTL_H
#include <sys/ioctl.h>
#endif
#ifdef HAVE_SYS_STAT_H
#include <sys/stat.h>
#endif
#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#endif
#ifdef HAVE_SYS_UTIME_H
#include <sys/utime.h>
#endif
#ifdef HAVE_COPYFILE_H
#include <copyfile.h>
#endif
#ifdef HAVE_ERRNO_H
#include <errno.h>
#endif
#ifdef HAVE_FCNTL_H
#include <fcntl.h>
#endif
#ifdef HAVE_GRP_H
#include <grp.h>
#endif
#ifdef HAVE_LANGINFO_H
#include <langinfo.h>
#endif
#ifdef HAVE_LINUX_FS_H
#include <linux/fs.h> /* for Linux file flags */
#endif
/*
* Some Linux distributions have both linux/ext2_fs.h and ext2fs/ext2_fs.h.
* As the include guards don't agree, the order of include is important.
*/
#ifdef HAVE_LINUX_EXT2_FS_H
#include <linux/ext2_fs.h> /* for Linux file flags */
#endif
#if defined(HAVE_EXT2FS_EXT2_FS_H) && !defined(__CYGWIN__)
#include <ext2fs/ext2_fs.h> /* Linux file flags, broken on Cygwin */
#endif
#ifdef HAVE_LIMITS_H
#include <limits.h>
#endif
#ifdef HAVE_PWD_H
#include <pwd.h>
#endif
#include <stdio.h>
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_UTIME_H
#include <utime.h>
#endif
#ifdef F_GETTIMES /* Tru64 specific */
#include <sys/fcntl1.h>
#endif
/*
* Macro to cast st_mtime and time_t to an int64 so that 2 numbers can reliably be compared.
*
* It assumes that the input is an integer type of no more than 64 bits.
* If the number is less than zero, t must be a signed type, so it fits in
* int64_t. Otherwise, it's a nonnegative value so we can cast it to uint64_t
* without loss. But it could be a large unsigned value, so we have to clip it
* to INT64_MAX.*
*/
#define to_int64_time(t) \
((t) < 0 ? (int64_t)(t) : (uint64_t)(t) > (uint64_t)INT64_MAX ? INT64_MAX : (int64_t)(t))
#if __APPLE__
#include <TargetConditionals.h>
#if TARGET_OS_MAC && !TARGET_OS_EMBEDDED && HAVE_QUARANTINE_H
#include <quarantine.h>
#define HAVE_QUARANTINE 1
#endif
#endif
#ifdef HAVE_ZLIB_H
#include <cm3p/zlib.h>
#endif
/* TODO: Support Mac OS 'quarantine' feature. This is really just a
* standard tag to mark files that have been downloaded as "tainted".
* On Mac OS, we should mark the extracted files as tainted if the
* archive being read was tainted. Windows has a similar feature; we
* should investigate ways to support this generically. */
#include "archive.h"
#include "archive_acl_private.h"
#include "archive_string.h"
#include "archive_endian.h"
#include "archive_entry.h"
#include "archive_private.h"
#include "archive_write_disk_private.h"
#ifndef O_BINARY
#define O_BINARY 0
#endif
#ifndef O_CLOEXEC
#define O_CLOEXEC 0
#endif
/* Ignore non-int O_NOFOLLOW constant. */
/* gnulib's fcntl.h does this on AIX, but it seems practical everywhere */
#if defined O_NOFOLLOW && !(INT_MIN <= O_NOFOLLOW && O_NOFOLLOW <= INT_MAX)
#undef O_NOFOLLOW
#endif
#ifndef O_NOFOLLOW
#define O_NOFOLLOW 0
#endif
#ifndef AT_FDCWD
#define AT_FDCWD -100
#endif
struct fixup_entry {
struct fixup_entry *next;
struct archive_acl acl;
mode_t mode;
__LA_MODE_T filetype;
int64_t atime;
int64_t birthtime;
int64_t mtime;
int64_t ctime;
unsigned long atime_nanos;
unsigned long birthtime_nanos;
unsigned long mtime_nanos;
unsigned long ctime_nanos;
unsigned long fflags_set;
size_t mac_metadata_size;
void *mac_metadata;
int fixup; /* bitmask of what needs fixing */
char *name;
};
/*
* We use a bitmask to track which operations remain to be done for
* this file. In particular, this helps us avoid unnecessary
* operations when it's possible to take care of one step as a
* side-effect of another. For example, mkdir() can specify the mode
* for the newly-created object but symlink() cannot. This means we
* can skip chmod() if mkdir() succeeded, but we must explicitly
* chmod() if we're trying to create a directory that already exists
* (mkdir() failed) or if we're restoring a symlink. Similarly, we
* need to verify UID/GID before trying to restore SUID/SGID bits;
* that verification can occur explicitly through a stat() call or
* implicitly because of a successful chown() call.
*/
#define TODO_MODE_FORCE 0x40000000
#define TODO_MODE_BASE 0x20000000
#define TODO_SUID 0x10000000
#define TODO_SUID_CHECK 0x08000000
#define TODO_SGID 0x04000000
#define TODO_SGID_CHECK 0x02000000
#define TODO_APPLEDOUBLE 0x01000000
#define TODO_MODE (TODO_MODE_BASE|TODO_SUID|TODO_SGID)
#define TODO_TIMES ARCHIVE_EXTRACT_TIME
#define TODO_OWNER ARCHIVE_EXTRACT_OWNER
#define TODO_FFLAGS ARCHIVE_EXTRACT_FFLAGS
#define TODO_ACLS ARCHIVE_EXTRACT_ACL
#define TODO_XATTR ARCHIVE_EXTRACT_XATTR
#define TODO_MAC_METADATA ARCHIVE_EXTRACT_MAC_METADATA
#define TODO_HFS_COMPRESSION ARCHIVE_EXTRACT_HFS_COMPRESSION_FORCED
struct archive_write_disk {
struct archive archive;
mode_t user_umask;
struct fixup_entry *fixup_list;
struct fixup_entry *current_fixup;
int64_t user_uid;
int skip_file_set;
int64_t skip_file_dev;
int64_t skip_file_ino;
time_t start_time;
int64_t (*lookup_gid)(void *private, const char *gname, int64_t gid);
void (*cleanup_gid)(void *private);
void *lookup_gid_data;
int64_t (*lookup_uid)(void *private, const char *uname, int64_t uid);
void (*cleanup_uid)(void *private);
void *lookup_uid_data;
/*
* Full path of last file to satisfy symlink checks.
*/
struct archive_string path_safe;
/*
* Cached stat data from disk for the current entry.
* If this is valid, pst points to st. Otherwise,
* pst is null.
*/
struct stat st;
struct stat *pst;
/* Information about the object being restored right now. */
struct archive_entry *entry; /* Entry being extracted. */
char *name; /* Name of entry, possibly edited. */
struct archive_string _name_data; /* backing store for 'name' */
char *tmpname; /* Temporary name * */
struct archive_string _tmpname_data; /* backing store for 'tmpname' */
/* Tasks remaining for this object. */
int todo;
/* Tasks deferred until end-of-archive. */
int deferred;
/* Options requested by the client. */
int flags;
/* Handle for the file we're restoring. */
int fd;
/* Current offset for writing data to the file. */
int64_t offset;
/* Last offset actually written to disk. */
int64_t fd_offset;
/* Total bytes actually written to files. */
int64_t total_bytes_written;
/* Maximum size of file, -1 if unknown. */
int64_t filesize;
/* Dir we were in before this restore; only for deep paths. */
int restore_pwd;
/* Mode we should use for this entry; affected by _PERM and umask. */
mode_t mode;
/* UID/GID to use in restoring this entry. */
int64_t uid;
int64_t gid;
/*
* HFS+ Compression.
*/
/* Xattr "com.apple.decmpfs". */
uint32_t decmpfs_attr_size;
unsigned char *decmpfs_header_p;
/* ResourceFork set options used for fsetxattr. */
int rsrc_xattr_options;
/* Xattr "com.apple.ResourceFork". */
unsigned char *resource_fork;
size_t resource_fork_allocated_size;
unsigned int decmpfs_block_count;
uint32_t *decmpfs_block_info;
/* Buffer for compressed data. */
unsigned char *compressed_buffer;
size_t compressed_buffer_size;
size_t compressed_buffer_remaining;
/* The offset of the ResourceFork where compressed data will
* be placed. */
uint32_t compressed_rsrc_position;
uint32_t compressed_rsrc_position_v;
/* Buffer for uncompressed data. */
char *uncompressed_buffer;
size_t block_remaining_bytes;
size_t file_remaining_bytes;
#ifdef HAVE_ZLIB_H
z_stream stream;
int stream_valid;
int decmpfs_compression_level;
#endif
};
/*
* Default mode for dirs created automatically (will be modified by umask).
* Note that POSIX specifies 0777 for implicitly-created dirs, "modified
* by the process' file creation mask."
*/
#define DEFAULT_DIR_MODE 0777
/*
* Dir modes are restored in two steps: During the extraction, the permissions
* in the archive are modified to match the following limits. During
* the post-extract fixup pass, the permissions from the archive are
* applied.
*/
#define MINIMUM_DIR_MODE 0700
#define MAXIMUM_DIR_MODE 0775
/*
* Maximum uncompressed size of a decmpfs block.
*/
#define MAX_DECMPFS_BLOCK_SIZE (64 * 1024)
/*
* HFS+ compression type.
*/
#define CMP_XATTR 3/* Compressed data in xattr. */
#define CMP_RESOURCE_FORK 4/* Compressed data in resource fork. */
/*
* HFS+ compression resource fork.
*/
#define RSRC_H_SIZE 260 /* Base size of Resource fork header. */
#define RSRC_F_SIZE 50 /* Size of Resource fork footer. */
/* Size to write compressed data to resource fork. */
#define COMPRESSED_W_SIZE (64 * 1024)
/* decmpfs definitions. */
#define MAX_DECMPFS_XATTR_SIZE 3802
#ifndef DECMPFS_XATTR_NAME
#define DECMPFS_XATTR_NAME "com.apple.decmpfs"
#endif
#define DECMPFS_MAGIC 0x636d7066
#define DECMPFS_COMPRESSION_MAGIC 0
#define DECMPFS_COMPRESSION_TYPE 4
#define DECMPFS_UNCOMPRESSED_SIZE 8
#define DECMPFS_HEADER_SIZE 16
#define HFS_BLOCKS(s) ((s) >> 12)
static int la_opendirat(int, const char *);
static int la_mktemp(struct archive_write_disk *);
static int la_verify_filetype(mode_t, __LA_MODE_T);
static void fsobj_error(int *, struct archive_string *, int, const char *,
const char *);
static int check_symlinks_fsobj(char *, int *, struct archive_string *,
int, int);
static int check_symlinks(struct archive_write_disk *);
static int create_filesystem_object(struct archive_write_disk *);
static struct fixup_entry *current_fixup(struct archive_write_disk *,
const char *pathname);
#if defined(HAVE_FCHDIR) && defined(PATH_MAX)
static void edit_deep_directories(struct archive_write_disk *ad);
#endif
static int cleanup_pathname_fsobj(char *, int *, struct archive_string *,
int);
static int cleanup_pathname(struct archive_write_disk *);
static int create_dir(struct archive_write_disk *, char *);
static int create_parent_dir(struct archive_write_disk *, char *);
static ssize_t hfs_write_data_block(struct archive_write_disk *,
const char *, size_t);
static int fixup_appledouble(struct archive_write_disk *, const char *);
static int older(struct stat *, struct archive_entry *);
static int restore_entry(struct archive_write_disk *);
static int set_mac_metadata(struct archive_write_disk *, const char *,
const void *, size_t);
static int set_xattrs(struct archive_write_disk *);
static int clear_nochange_fflags(struct archive_write_disk *);
static int set_fflags(struct archive_write_disk *);
static int set_fflags_platform(struct archive_write_disk *, int fd,
const char *name, mode_t mode,
unsigned long fflags_set, unsigned long fflags_clear);
static int set_ownership(struct archive_write_disk *);
static int set_mode(struct archive_write_disk *, int mode);
static int set_time(int, int, const char *, time_t, long, time_t, long);
static int set_times(struct archive_write_disk *, int, int, const char *,
time_t, long, time_t, long, time_t, long, time_t, long);
static int set_times_from_entry(struct archive_write_disk *);
static struct fixup_entry *sort_dir_list(struct fixup_entry *p);
static ssize_t write_data_block(struct archive_write_disk *,
const char *, size_t);
static int _archive_write_disk_close(struct archive *);
static int _archive_write_disk_free(struct archive *);
static int _archive_write_disk_header(struct archive *,
struct archive_entry *);
static int64_t _archive_write_disk_filter_bytes(struct archive *, int);
static int _archive_write_disk_finish_entry(struct archive *);
static ssize_t _archive_write_disk_data(struct archive *, const void *,
size_t);
static ssize_t _archive_write_disk_data_block(struct archive *, const void *,
size_t, int64_t);
static int
la_mktemp(struct archive_write_disk *a)
{
int oerrno, fd;
mode_t mode;
archive_string_empty(&a->_tmpname_data);
archive_string_sprintf(&a->_tmpname_data, "%s.XXXXXX", a->name);
a->tmpname = a->_tmpname_data.s;
fd = __archive_mkstemp(a->tmpname);
if (fd == -1)
return -1;
mode = a->mode & 0777 & ~a->user_umask;
if (fchmod(fd, mode) == -1) {
oerrno = errno;
close(fd);
errno = oerrno;
return -1;
}
return fd;
}
static int
la_opendirat(int fd, const char *path) {
const int flags = O_CLOEXEC
#if defined(O_BINARY)
| O_BINARY
#endif
#if defined(O_DIRECTORY)
| O_DIRECTORY
#endif
#if defined(O_PATH)
| O_PATH
#elif defined(O_SEARCH)
| O_SEARCH
#elif defined(__FreeBSD__) && defined(O_EXEC)
| O_EXEC
#else
| O_RDONLY
#endif
;
#if !defined(HAVE_OPENAT)
if (fd != AT_FDCWD) {
errno = ENOTSUP;
return (-1);
} else
return (open(path, flags));
#else
return (openat(fd, path, flags));
#endif
}
static int
la_verify_filetype(mode_t mode, __LA_MODE_T filetype) {
int ret = 0;
switch (filetype) {
case AE_IFREG:
ret = (S_ISREG(mode));
break;
case AE_IFDIR:
ret = (S_ISDIR(mode));
break;
case AE_IFLNK:
ret = (S_ISLNK(mode));
break;
case AE_IFSOCK:
ret = (S_ISSOCK(mode));
break;
case AE_IFCHR:
ret = (S_ISCHR(mode));
break;
case AE_IFBLK:
ret = (S_ISBLK(mode));
break;
case AE_IFIFO:
ret = (S_ISFIFO(mode));
break;
default:
break;
}
return (ret);
}
static int
lazy_stat(struct archive_write_disk *a)
{
if (a->pst != NULL) {
/* Already have stat() data available. */
return (ARCHIVE_OK);
}
#ifdef HAVE_FSTAT
if (a->fd >= 0 && fstat(a->fd, &a->st) == 0) {
a->pst = &a->st;
return (ARCHIVE_OK);
}
#endif
/*
* XXX At this point, symlinks should not be hit, otherwise
* XXX a race occurred. Do we want to check explicitly for that?
*/
if (lstat(a->name, &a->st) == 0) {
a->pst = &a->st;
return (ARCHIVE_OK);
}
archive_set_error(&a->archive, errno, "Couldn't stat file");
return (ARCHIVE_WARN);
}
static const struct archive_vtable
archive_write_disk_vtable = {
.archive_close = _archive_write_disk_close,
.archive_filter_bytes = _archive_write_disk_filter_bytes,
.archive_free = _archive_write_disk_free,
.archive_write_header = _archive_write_disk_header,
.archive_write_finish_entry = _archive_write_disk_finish_entry,
.archive_write_data = _archive_write_disk_data,
.archive_write_data_block = _archive_write_disk_data_block,
};
static int64_t
_archive_write_disk_filter_bytes(struct archive *_a, int n)
{
struct archive_write_disk *a = (struct archive_write_disk *)_a;
(void)n; /* UNUSED */
if (n == -1 || n == 0)
return (a->total_bytes_written);
return (-1);
}
int
archive_write_disk_set_options(struct archive *_a, int flags)
{
struct archive_write_disk *a = (struct archive_write_disk *)_a;
a->flags = flags;
return (ARCHIVE_OK);
}
/*
* Extract this entry to disk.
*
* TODO: Validate hardlinks. According to the standards, we're
* supposed to check each extracted hardlink and squawk if it refers
* to a file that we didn't restore. I'm not entirely convinced this
* is a good idea, but more importantly: Is there any way to validate
* hardlinks without keeping a complete list of filenames from the
* entire archive?? Ugh.
*
*/
static int
_archive_write_disk_header(struct archive *_a, struct archive_entry *entry)
{
struct archive_write_disk *a = (struct archive_write_disk *)_a;
struct fixup_entry *fe;
const char *linkname;
int ret, r;
archive_check_magic(&a->archive, ARCHIVE_WRITE_DISK_MAGIC,
ARCHIVE_STATE_HEADER | ARCHIVE_STATE_DATA,
"archive_write_disk_header");
archive_clear_error(&a->archive);
if (a->archive.state & ARCHIVE_STATE_DATA) {
r = _archive_write_disk_finish_entry(&a->archive);
if (r == ARCHIVE_FATAL)
return (r);
}
/* Set up for this particular entry. */
a->pst = NULL;
a->current_fixup = NULL;
a->deferred = 0;
if (a->entry) {
archive_entry_free(a->entry);
a->entry = NULL;
}
a->entry = archive_entry_clone(entry);
a->fd = -1;
a->fd_offset = 0;
a->offset = 0;
a->restore_pwd = -1;
a->uid = a->user_uid;
a->mode = archive_entry_mode(a->entry);
if (archive_entry_size_is_set(a->entry))
a->filesize = archive_entry_size(a->entry);
else
a->filesize = -1;
archive_strcpy(&(a->_name_data), archive_entry_pathname(a->entry));
a->name = a->_name_data.s;
archive_clear_error(&a->archive);
/*
* Clean up the requested path. This is necessary for correct
* dir restores; the dir restore logic otherwise gets messed
* up by nonsense like "dir/.".
*/
ret = cleanup_pathname(a);
if (ret != ARCHIVE_OK)
return (ret);
/*
* Check if we have a hardlink that points to itself.
*/
linkname = archive_entry_hardlink(a->entry);
if (linkname != NULL && strcmp(a->name, linkname) == 0) {
archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
"Skipping hardlink pointing to itself: %s",
a->name);
return (ARCHIVE_WARN);
}
/*
* Query the umask so we get predictable mode settings.
* This gets done on every call to _write_header in case the
* user edits their umask during the extraction for some
* reason.
*/
umask(a->user_umask = umask(0));
/* Figure out what we need to do for this entry. */
a->todo = TODO_MODE_BASE;
if (a->flags & ARCHIVE_EXTRACT_PERM) {
a->todo |= TODO_MODE_FORCE; /* Be pushy about permissions. */
/*
* SGID requires an extra "check" step because we
* cannot easily predict the GID that the system will
* assign. (Different systems assign GIDs to files
* based on a variety of criteria, including process
* credentials and the gid of the enclosing
* directory.) We can only restore the SGID bit if
* the file has the right GID, and we only know the
* GID if we either set it (see set_ownership) or if
* we've actually called stat() on the file after it
* was restored. Since there are several places at
* which we might verify the GID, we need a TODO bit
* to keep track.
*/
if (a->mode & S_ISGID)
a->todo |= TODO_SGID | TODO_SGID_CHECK;
/*
* Verifying the SUID is simpler, but can still be
* done in multiple ways, hence the separate "check" bit.
*/
if (a->mode & S_ISUID)
a->todo |= TODO_SUID | TODO_SUID_CHECK;
} else {
/*
* User didn't request full permissions, so don't
* restore SUID, SGID bits and obey umask.
*/
a->mode &= ~S_ISUID;
a->mode &= ~S_ISGID;
a->mode &= ~S_ISVTX;
a->mode &= ~a->user_umask;
}
if (a->flags & ARCHIVE_EXTRACT_OWNER)
a->todo |= TODO_OWNER;
if (a->flags & ARCHIVE_EXTRACT_TIME)
a->todo |= TODO_TIMES;
if (a->flags & ARCHIVE_EXTRACT_ACL) {
#if ARCHIVE_ACL_DARWIN
/*
* On MacOS, platform ACLs get stored in mac_metadata, too.
* If we intend to extract mac_metadata and it is present
* we skip extracting libarchive NFSv4 ACLs.
*/
size_t metadata_size;
if ((a->flags & ARCHIVE_EXTRACT_MAC_METADATA) == 0 ||
archive_entry_mac_metadata(a->entry,
&metadata_size) == NULL || metadata_size == 0)
#endif
#if ARCHIVE_ACL_LIBRICHACL
/*
* RichACLs are stored in an extended attribute.
* If we intend to extract extended attributes and have this
* attribute we skip extracting libarchive NFSv4 ACLs.
*/
short extract_acls = 1;
if (a->flags & ARCHIVE_EXTRACT_XATTR && (
archive_entry_acl_types(a->entry) &
ARCHIVE_ENTRY_ACL_TYPE_NFS4)) {
const char *attr_name;
const void *attr_value;
size_t attr_size;
int i = archive_entry_xattr_reset(a->entry);
while (i--) {
archive_entry_xattr_next(a->entry, &attr_name,
&attr_value, &attr_size);
if (attr_name != NULL && attr_value != NULL &&
attr_size > 0 && strcmp(attr_name,
"trusted.richacl") == 0) {
extract_acls = 0;
break;
}
}
}
if (extract_acls)
#endif
#if ARCHIVE_ACL_DARWIN || ARCHIVE_ACL_LIBRICHACL
{
#endif
if (archive_entry_filetype(a->entry) == AE_IFDIR)
a->deferred |= TODO_ACLS;
else
a->todo |= TODO_ACLS;
#if ARCHIVE_ACL_DARWIN || ARCHIVE_ACL_LIBRICHACL
}
#endif
}
if (a->flags & ARCHIVE_EXTRACT_MAC_METADATA) {
if (archive_entry_filetype(a->entry) == AE_IFDIR)
a->deferred |= TODO_MAC_METADATA;
else
a->todo |= TODO_MAC_METADATA;
}
#if defined(__APPLE__) && defined(UF_COMPRESSED) && defined(HAVE_ZLIB_H)
if ((a->flags & ARCHIVE_EXTRACT_NO_HFS_COMPRESSION) == 0) {
unsigned long set, clear;
archive_entry_fflags(a->entry, &set, &clear);
if ((set & ~clear) & UF_COMPRESSED) {
a->todo |= TODO_HFS_COMPRESSION;
a->decmpfs_block_count = (unsigned)-1;
}
}
if ((a->flags & ARCHIVE_EXTRACT_HFS_COMPRESSION_FORCED) != 0 &&
(a->mode & AE_IFMT) == AE_IFREG && a->filesize > 0) {
a->todo |= TODO_HFS_COMPRESSION;
a->decmpfs_block_count = (unsigned)-1;
}
{
const char *p;
/* Check if the current file name is a type of the
* resource fork file. */
p = strrchr(a->name, '/');
if (p == NULL)
p = a->name;
else
p++;
if (p[0] == '.' && p[1] == '_') {
/* Do not compress "._XXX" files. */
a->todo &= ~TODO_HFS_COMPRESSION;
if (a->filesize > 0)
a->todo |= TODO_APPLEDOUBLE;
}
}
#endif
if (a->flags & ARCHIVE_EXTRACT_XATTR) {
#if ARCHIVE_XATTR_DARWIN
/*
* On MacOS, extended attributes get stored in mac_metadata,
* too. If we intend to extract mac_metadata and it is present
* we skip extracting extended attributes.
*/
size_t metadata_size;
if ((a->flags & ARCHIVE_EXTRACT_MAC_METADATA) == 0 ||
archive_entry_mac_metadata(a->entry,
&metadata_size) == NULL || metadata_size == 0)
#endif
a->todo |= TODO_XATTR;
}
if (a->flags & ARCHIVE_EXTRACT_FFLAGS)
a->todo |= TODO_FFLAGS;
if (a->flags & ARCHIVE_EXTRACT_SECURE_SYMLINKS) {
ret = check_symlinks(a);
if (ret != ARCHIVE_OK)
return (ret);
}
#if defined(HAVE_FCHDIR) && defined(PATH_MAX)
/* If path exceeds PATH_MAX, shorten the path. */
edit_deep_directories(a);
#endif
ret = restore_entry(a);
#if defined(__APPLE__) && defined(UF_COMPRESSED) && defined(HAVE_ZLIB_H)
/*
* Check if the filesystem the file is restoring on supports
* HFS+ Compression. If not, cancel HFS+ Compression.
*/
if (a->todo | TODO_HFS_COMPRESSION) {
/*
* NOTE: UF_COMPRESSED is ignored even if the filesystem
* supports HFS+ Compression because the file should
* have at least an extended attribute "com.apple.decmpfs"
* before the flag is set to indicate that the file have
* been compressed. If the filesystem does not support
* HFS+ Compression the system call will fail.
*/
if (a->fd < 0 || fchflags(a->fd, UF_COMPRESSED) != 0)
a->todo &= ~TODO_HFS_COMPRESSION;
}
#endif
/*
* TODO: There are rumours that some extended attributes must
* be restored before file data is written. If this is true,
* then we either need to write all extended attributes both
* before and after restoring the data, or find some rule for
* determining which must go first and which last. Due to the
* many ways people are using xattrs, this may prove to be an
* intractable problem.
*/
#ifdef HAVE_FCHDIR
/* If we changed directory above, restore it here. */
if (a->restore_pwd >= 0) {
r = fchdir(a->restore_pwd);
if (r != 0) {
archive_set_error(&a->archive, errno,
"chdir() failure");
ret = ARCHIVE_FATAL;
}
close(a->restore_pwd);
a->restore_pwd = -1;
}
#endif
/*
* Fixup uses the unedited pathname from archive_entry_pathname(),
* because it is relative to the base dir and the edited path
* might be relative to some intermediate dir as a result of the
* deep restore logic.
*/
if (a->deferred & TODO_MODE) {
fe = current_fixup(a, archive_entry_pathname(entry));
if (fe == NULL)
return (ARCHIVE_FATAL);
fe->filetype = archive_entry_filetype(entry);
fe->fixup |= TODO_MODE_BASE;
fe->mode = a->mode;
}
if ((a->deferred & TODO_TIMES)
&& (archive_entry_mtime_is_set(entry)
|| archive_entry_atime_is_set(entry))) {
fe = current_fixup(a, archive_entry_pathname(entry));
if (fe == NULL)
return (ARCHIVE_FATAL);
fe->filetype = archive_entry_filetype(entry);
fe->mode = a->mode;
fe->fixup |= TODO_TIMES;
if (archive_entry_atime_is_set(entry)) {
fe->atime = archive_entry_atime(entry);
fe->atime_nanos = archive_entry_atime_nsec(entry);
} else {
/* If atime is unset, use start time. */
fe->atime = a->start_time;
fe->atime_nanos = 0;
}
if (archive_entry_mtime_is_set(entry)) {
fe->mtime = archive_entry_mtime(entry);
fe->mtime_nanos = archive_entry_mtime_nsec(entry);
} else {
/* If mtime is unset, use start time. */
fe->mtime = a->start_time;
fe->mtime_nanos = 0;
}
if (archive_entry_birthtime_is_set(entry)) {
fe->birthtime = archive_entry_birthtime(entry);
fe->birthtime_nanos = archive_entry_birthtime_nsec(
entry);
} else {
/* If birthtime is unset, use mtime. */
fe->birthtime = fe->mtime;
fe->birthtime_nanos = fe->mtime_nanos;
}
}
if (a->deferred & TODO_ACLS) {
fe = current_fixup(a, archive_entry_pathname(entry));
if (fe == NULL)
return (ARCHIVE_FATAL);
fe->filetype = archive_entry_filetype(entry);
fe->fixup |= TODO_ACLS;
archive_acl_copy(&fe->acl, archive_entry_acl(entry));
}
if (a->deferred & TODO_MAC_METADATA) {
const void *metadata;
size_t metadata_size;
metadata = archive_entry_mac_metadata(a->entry, &metadata_size);
if (metadata != NULL && metadata_size > 0) {
fe = current_fixup(a, archive_entry_pathname(entry));
if (fe == NULL)
return (ARCHIVE_FATAL);
fe->filetype = archive_entry_filetype(entry);
fe->mac_metadata = malloc(metadata_size);
if (fe->mac_metadata != NULL) {
memcpy(fe->mac_metadata, metadata,
metadata_size);
fe->mac_metadata_size = metadata_size;
fe->fixup |= TODO_MAC_METADATA;
}
}
}
if (a->deferred & TODO_FFLAGS) {
fe = current_fixup(a, archive_entry_pathname(entry));
if (fe == NULL)
return (ARCHIVE_FATAL);
fe->filetype = archive_entry_filetype(entry);
fe->fixup |= TODO_FFLAGS;
/* TODO: Complete this.. defer fflags from below. */
}
/* We've created the object and are ready to pour data into it. */
if (ret >= ARCHIVE_WARN)
a->archive.state = ARCHIVE_STATE_DATA;
/*
* If it's not open, tell our client not to try writing.
* In particular, dirs, links, etc, don't get written to.
*/
if (a->fd < 0) {
archive_entry_set_size(entry, 0);
a->filesize = 0;
}
return (ret);
}
int
archive_write_disk_set_skip_file(struct archive *_a, la_int64_t d, la_int64_t i)
{
struct archive_write_disk *a = (struct archive_write_disk *)_a;
archive_check_magic(&a->archive, ARCHIVE_WRITE_DISK_MAGIC,
ARCHIVE_STATE_ANY, "archive_write_disk_set_skip_file");
a->skip_file_set = 1;
a->skip_file_dev = d;
a->skip_file_ino = i;
return (ARCHIVE_OK);
}
static ssize_t
write_data_block(struct archive_write_disk *a, const char *buff, size_t size)
{
uint64_t start_size = size;
ssize_t bytes_written = 0;
ssize_t block_size = 0, bytes_to_write;
if (size == 0)
return (ARCHIVE_OK);
if (a->filesize == 0 || a->fd < 0) {
archive_set_error(&a->archive, 0,
"Attempt to write to an empty file");
return (ARCHIVE_WARN);
}
if (a->flags & ARCHIVE_EXTRACT_SPARSE) {
#if HAVE_STRUCT_STAT_ST_BLKSIZE
int r;
if ((r = lazy_stat(a)) != ARCHIVE_OK)
return (r);
block_size = a->pst->st_blksize;
#else
/* XXX TODO XXX Is there a more appropriate choice here ? */
/* This needn't match the filesystem allocation size. */
block_size = 16*1024;
#endif
}
/* If this write would run beyond the file size, truncate it. */
if (a->filesize >= 0 && (int64_t)(a->offset + size) > a->filesize)
start_size = size = (size_t)(a->filesize - a->offset);
/* Write the data. */
while (size > 0) {
if (block_size == 0) {
bytes_to_write = size;
} else {
/* We're sparsifying the file. */
const char *p, *end;
int64_t block_end;
/* Skip leading zero bytes. */
for (p = buff, end = buff + size; p < end; ++p) {
if (*p != '\0')
break;
}
a->offset += p - buff;
size -= p - buff;
buff = p;
if (size == 0)
break;
/* Calculate next block boundary after offset. */
block_end
= (a->offset / block_size + 1) * block_size;
/* If the adjusted write would cross block boundary,
* truncate it to the block boundary. */
bytes_to_write = size;
if (a->offset + bytes_to_write > block_end)
bytes_to_write = block_end - a->offset;
}
/* Seek if necessary to the specified offset. */
if (a->offset != a->fd_offset) {
if (lseek(a->fd, a->offset, SEEK_SET) < 0) {
archive_set_error(&a->archive, errno,
"Seek failed");
return (ARCHIVE_FATAL);
}
a->fd_offset = a->offset;
}
bytes_written = write(a->fd, buff, bytes_to_write);
if (bytes_written < 0) {
archive_set_error(&a->archive, errno, "Write failed");
return (ARCHIVE_WARN);
}
buff += bytes_written;
size -= bytes_written;
a->total_bytes_written += bytes_written;
a->offset += bytes_written;
a->fd_offset = a->offset;
}
return (start_size - size);
}
#if defined(__APPLE__) && defined(UF_COMPRESSED) && defined(HAVE_SYS_XATTR_H)\
&& defined(HAVE_ZLIB_H)
/*
* Set UF_COMPRESSED file flag.
* This have to be called after hfs_write_decmpfs() because if the
* file does not have "com.apple.decmpfs" xattr the flag is ignored.
*/
static int
hfs_set_compressed_fflag(struct archive_write_disk *a)
{
int r;
if ((r = lazy_stat(a)) != ARCHIVE_OK)
return (r);
a->st.st_flags |= UF_COMPRESSED;
if (fchflags(a->fd, a->st.st_flags) != 0) {
archive_set_error(&a->archive, errno,
"Failed to set UF_COMPRESSED file flag");
return (ARCHIVE_WARN);
}
return (ARCHIVE_OK);
}
/*
* HFS+ Compression decmpfs
*
* +------------------------------+ +0
* | Magic(LE 4 bytes) |
* +------------------------------+
* | Type(LE 4 bytes) |
* +------------------------------+
* | Uncompressed size(LE 8 bytes)|
* +------------------------------+ +16
* | |
* | Compressed data |
* | (Placed only if Type == 3) |
* | |
* +------------------------------+ +3802 = MAX_DECMPFS_XATTR_SIZE
*
* Type is 3: decmpfs has compressed data.
* Type is 4: Resource Fork has compressed data.
*/
/*
* Write "com.apple.decmpfs"
*/
static int
hfs_write_decmpfs(struct archive_write_disk *a)
{
int r;
uint32_t compression_type;
r = fsetxattr(a->fd, DECMPFS_XATTR_NAME, a->decmpfs_header_p,
a->decmpfs_attr_size, 0, 0);
if (r < 0) {
archive_set_error(&a->archive, errno,
"Cannot restore xattr:%s", DECMPFS_XATTR_NAME);
compression_type = archive_le32dec(
&a->decmpfs_header_p[DECMPFS_COMPRESSION_TYPE]);
if (compression_type == CMP_RESOURCE_FORK)
fremovexattr(a->fd, XATTR_RESOURCEFORK_NAME,
XATTR_SHOWCOMPRESSION);
return (ARCHIVE_WARN);
}
return (ARCHIVE_OK);
}
/*
* HFS+ Compression Resource Fork
*
* +-----------------------------+
* | Header(260 bytes) |
* +-----------------------------+
* | Block count(LE 4 bytes) |
* +-----------------------------+ --+
* +-- | Offset (LE 4 bytes) | |
* | | [distance from Block count] | | Block 0
* | +-----------------------------+ |
* | | Compressed size(LE 4 bytes) | |
* | +-----------------------------+ --+
* | | |
* | | .................. |
* | | |
* | +-----------------------------+ --+
* | | Offset (LE 4 bytes) | |
* | +-----------------------------+ | Block (Block count -1)
* | | Compressed size(LE 4 bytes) | |
* +-> +-----------------------------+ --+
* | Compressed data(n bytes) | Block 0
* +-----------------------------+
* | |
* | .................. |
* | |
* +-----------------------------+
* | Compressed data(n bytes) | Block (Block count -1)
* +-----------------------------+
* | Footer(50 bytes) |
* +-----------------------------+
*
*/
/*
* Write the header of "com.apple.ResourceFork"
*/
static int
hfs_write_resource_fork(struct archive_write_disk *a, unsigned char *buff,
size_t bytes, uint32_t position)
{
int ret;
ret = fsetxattr(a->fd, XATTR_RESOURCEFORK_NAME, buff, bytes,
position, a->rsrc_xattr_options);
if (ret < 0) {
archive_set_error(&a->archive, errno,
"Cannot restore xattr: %s at %u pos %u bytes",
XATTR_RESOURCEFORK_NAME,
(unsigned)position,
(unsigned)bytes);
return (ARCHIVE_WARN);
}
a->rsrc_xattr_options &= ~XATTR_CREATE;
return (ARCHIVE_OK);
}
static int
hfs_write_compressed_data(struct archive_write_disk *a, size_t bytes_compressed)
{
int ret;
ret = hfs_write_resource_fork(a, a->compressed_buffer,
bytes_compressed, a->compressed_rsrc_position);
if (ret == ARCHIVE_OK)
a->compressed_rsrc_position += bytes_compressed;
return (ret);
}
static int
hfs_write_resource_fork_header(struct archive_write_disk *a)
{
unsigned char *buff;
uint32_t rsrc_bytes;
uint32_t rsrc_header_bytes;
/*
* Write resource fork header + block info.
*/
buff = a->resource_fork;
rsrc_bytes = a->compressed_rsrc_position - RSRC_F_SIZE;
rsrc_header_bytes =
RSRC_H_SIZE + /* Header base size. */
4 + /* Block count. */
(a->decmpfs_block_count * 8);/* Block info */
archive_be32enc(buff, 0x100);
archive_be32enc(buff + 4, rsrc_bytes);
archive_be32enc(buff + 8, rsrc_bytes - 256);
archive_be32enc(buff + 12, 0x32);
memset(buff + 16, 0, 240);
archive_be32enc(buff + 256, rsrc_bytes - 260);
return hfs_write_resource_fork(a, buff, rsrc_header_bytes, 0);
}
static size_t
hfs_set_resource_fork_footer(unsigned char *buff, size_t buff_size)
{
static const char rsrc_footer[RSRC_F_SIZE] = {
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x1c, 0x00, 0x32, 0x00, 0x00, 'c', 'm',
'p', 'f', 0x00, 0x00, 0x00, 0x0a, 0x00, 0x01,
0xff, 0xff, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00
};
if (buff_size < sizeof(rsrc_footer))
return (0);
memcpy(buff, rsrc_footer, sizeof(rsrc_footer));
return (sizeof(rsrc_footer));
}
static int
hfs_reset_compressor(struct archive_write_disk *a)
{
int ret;
if (a->stream_valid)
ret = deflateReset(&a->stream);
else
ret = deflateInit(&a->stream, a->decmpfs_compression_level);
if (ret != Z_OK) {
archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
"Failed to initialize compressor");
return (ARCHIVE_FATAL);
} else
a->stream_valid = 1;
return (ARCHIVE_OK);
}
static int
hfs_decompress(struct archive_write_disk *a)
{
uint32_t *block_info;
unsigned int block_count;
uint32_t data_pos, data_size;
ssize_t r;
ssize_t bytes_written, bytes_to_write;
unsigned char *b;
block_info = (uint32_t *)(a->resource_fork + RSRC_H_SIZE);
block_count = archive_le32dec(block_info++);
while (block_count--) {
data_pos = RSRC_H_SIZE + archive_le32dec(block_info++);
data_size = archive_le32dec(block_info++);
r = fgetxattr(a->fd, XATTR_RESOURCEFORK_NAME,
a->compressed_buffer, data_size, data_pos, 0);
if (r != data_size) {
archive_set_error(&a->archive,
(r < 0)?errno:ARCHIVE_ERRNO_MISC,
"Failed to read resource fork");
return (ARCHIVE_WARN);
}
if (a->compressed_buffer[0] == 0xff) {
bytes_to_write = data_size -1;
b = a->compressed_buffer + 1;
} else {
uLong dest_len = MAX_DECMPFS_BLOCK_SIZE;
int zr;
zr = uncompress((Bytef *)a->uncompressed_buffer,
&dest_len, a->compressed_buffer, data_size);
if (zr != Z_OK) {
archive_set_error(&a->archive,
ARCHIVE_ERRNO_MISC,
"Failed to decompress resource fork");
return (ARCHIVE_WARN);
}
bytes_to_write = dest_len;
b = (unsigned char *)a->uncompressed_buffer;
}
do {
bytes_written = write(a->fd, b, bytes_to_write);
if (bytes_written < 0) {
archive_set_error(&a->archive, errno,
"Write failed");
return (ARCHIVE_WARN);
}
bytes_to_write -= bytes_written;
b += bytes_written;
} while (bytes_to_write > 0);
}
r = fremovexattr(a->fd, XATTR_RESOURCEFORK_NAME, 0);
if (r == -1) {
archive_set_error(&a->archive, errno,
"Failed to remove resource fork");
return (ARCHIVE_WARN);
}
return (ARCHIVE_OK);
}
static int
hfs_drive_compressor(struct archive_write_disk *a, const char *buff,
size_t size)
{
unsigned char *buffer_compressed;
size_t bytes_compressed;
size_t bytes_used;
int ret;
ret = hfs_reset_compressor(a);
if (ret != ARCHIVE_OK)
return (ret);
if (a->compressed_buffer == NULL) {
size_t block_size;
block_size = COMPRESSED_W_SIZE + RSRC_F_SIZE +
+ compressBound(MAX_DECMPFS_BLOCK_SIZE);
a->compressed_buffer = malloc(block_size);
if (a->compressed_buffer == NULL) {
archive_set_error(&a->archive, ENOMEM,
"Can't allocate memory for Resource Fork");
return (ARCHIVE_FATAL);
}
a->compressed_buffer_size = block_size;
a->compressed_buffer_remaining = block_size;
}
buffer_compressed = a->compressed_buffer +
a->compressed_buffer_size - a->compressed_buffer_remaining;
a->stream.next_in = (Bytef *)(uintptr_t)(const void *)buff;
a->stream.avail_in = size;
a->stream.next_out = buffer_compressed;
a->stream.avail_out = a->compressed_buffer_remaining;
do {
ret = deflate(&a->stream, Z_FINISH);
switch (ret) {
case Z_OK:
case Z_STREAM_END:
break;
default:
archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
"Failed to compress data");
return (ARCHIVE_FAILED);
}
} while (ret == Z_OK);
bytes_compressed = a->compressed_buffer_remaining - a->stream.avail_out;
/*
* If the compressed size is larger than the original size,
* throw away compressed data, use uncompressed data instead.
*/
if (bytes_compressed > size) {
buffer_compressed[0] = 0xFF;/* uncompressed marker. */
memcpy(buffer_compressed + 1, buff, size);
bytes_compressed = size + 1;
}
a->compressed_buffer_remaining -= bytes_compressed;
/*
* If the compressed size is smaller than MAX_DECMPFS_XATTR_SIZE
* and the block count in the file is only one, store compressed
* data to decmpfs xattr instead of the resource fork.
*/
if (a->decmpfs_block_count == 1 &&
(a->decmpfs_attr_size + bytes_compressed)
<= MAX_DECMPFS_XATTR_SIZE) {
archive_le32enc(&a->decmpfs_header_p[DECMPFS_COMPRESSION_TYPE],
CMP_XATTR);
memcpy(a->decmpfs_header_p + DECMPFS_HEADER_SIZE,
buffer_compressed, bytes_compressed);
a->decmpfs_attr_size += bytes_compressed;
a->compressed_buffer_remaining = a->compressed_buffer_size;
/*
* Finish HFS+ Compression.
* - Write the decmpfs xattr.
* - Set the UF_COMPRESSED file flag.
*/
ret = hfs_write_decmpfs(a);
if (ret == ARCHIVE_OK)
ret = hfs_set_compressed_fflag(a);
return (ret);
}
/* Update block info. */
archive_le32enc(a->decmpfs_block_info++,
a->compressed_rsrc_position_v - RSRC_H_SIZE);
archive_le32enc(a->decmpfs_block_info++, bytes_compressed);
a->compressed_rsrc_position_v += bytes_compressed;
/*
* Write the compressed data to the resource fork.
*/
bytes_used = a->compressed_buffer_size - a->compressed_buffer_remaining;
while (bytes_used >= COMPRESSED_W_SIZE) {
ret = hfs_write_compressed_data(a, COMPRESSED_W_SIZE);
if (ret != ARCHIVE_OK)
return (ret);
bytes_used -= COMPRESSED_W_SIZE;
if (bytes_used > COMPRESSED_W_SIZE)
memmove(a->compressed_buffer,
a->compressed_buffer + COMPRESSED_W_SIZE,
bytes_used);
else
memcpy(a->compressed_buffer,
a->compressed_buffer + COMPRESSED_W_SIZE,
bytes_used);
}
a->compressed_buffer_remaining = a->compressed_buffer_size - bytes_used;
/*
* If the current block is the last block, write the remaining
* compressed data and the resource fork footer.
*/
if (a->file_remaining_bytes == 0) {
size_t rsrc_size;
int64_t bk;
/* Append the resource footer. */
rsrc_size = hfs_set_resource_fork_footer(
a->compressed_buffer + bytes_used,
a->compressed_buffer_remaining);
ret = hfs_write_compressed_data(a, bytes_used + rsrc_size);
a->compressed_buffer_remaining = a->compressed_buffer_size;
/* If the compressed size is not enough smaller than
* the uncompressed size. cancel HFS+ compression.
* TODO: study a behavior of ditto utility and improve
* the condition to fall back into no HFS+ compression. */
bk = HFS_BLOCKS(a->compressed_rsrc_position);
bk += bk >> 7;
if (bk > HFS_BLOCKS(a->filesize))
return hfs_decompress(a);
/*
* Write the resourcefork header.
*/
if (ret == ARCHIVE_OK)
ret = hfs_write_resource_fork_header(a);
/*
* Finish HFS+ Compression.
* - Write the decmpfs xattr.
* - Set the UF_COMPRESSED file flag.
*/
if (ret == ARCHIVE_OK)
ret = hfs_write_decmpfs(a);
if (ret == ARCHIVE_OK)
ret = hfs_set_compressed_fflag(a);
}
return (ret);
}
static ssize_t
hfs_write_decmpfs_block(struct archive_write_disk *a, const char *buff,
size_t size)
{
const char *buffer_to_write;
size_t bytes_to_write;
int ret;
if (a->decmpfs_block_count == (unsigned)-1) {
void *new_block;
size_t new_size;
unsigned int block_count;
if (a->decmpfs_header_p == NULL) {
new_block = malloc(MAX_DECMPFS_XATTR_SIZE
+ sizeof(uint32_t));
if (new_block == NULL) {
archive_set_error(&a->archive, ENOMEM,
"Can't allocate memory for decmpfs");
return (ARCHIVE_FATAL);
}
a->decmpfs_header_p = new_block;
}
a->decmpfs_attr_size = DECMPFS_HEADER_SIZE;
archive_le32enc(&a->decmpfs_header_p[DECMPFS_COMPRESSION_MAGIC],
DECMPFS_MAGIC);
archive_le32enc(&a->decmpfs_header_p[DECMPFS_COMPRESSION_TYPE],
CMP_RESOURCE_FORK);
archive_le64enc(&a->decmpfs_header_p[DECMPFS_UNCOMPRESSED_SIZE],
a->filesize);
/* Calculate a block count of the file. */
block_count =
(a->filesize + MAX_DECMPFS_BLOCK_SIZE -1) /
MAX_DECMPFS_BLOCK_SIZE;
/*
* Allocate buffer for resource fork.
* Set up related pointers;
*/
new_size =
RSRC_H_SIZE + /* header */
4 + /* Block count */
(block_count * sizeof(uint32_t) * 2) +
RSRC_F_SIZE; /* footer */
if (new_size > a->resource_fork_allocated_size) {
new_block = realloc(a->resource_fork, new_size);
if (new_block == NULL) {
archive_set_error(&a->archive, ENOMEM,
"Can't allocate memory for ResourceFork");
return (ARCHIVE_FATAL);
}
a->resource_fork_allocated_size = new_size;
a->resource_fork = new_block;
}
/* Allocate uncompressed buffer */
if (a->uncompressed_buffer == NULL) {
new_block = malloc(MAX_DECMPFS_BLOCK_SIZE);
if (new_block == NULL) {
archive_set_error(&a->archive, ENOMEM,
"Can't allocate memory for decmpfs");
return (ARCHIVE_FATAL);
}
a->uncompressed_buffer = new_block;
}
a->block_remaining_bytes = MAX_DECMPFS_BLOCK_SIZE;
a->file_remaining_bytes = a->filesize;
a->compressed_buffer_remaining = a->compressed_buffer_size;
/*
* Set up a resource fork.
*/
a->rsrc_xattr_options = XATTR_CREATE;
/* Get the position where we are going to set a bunch
* of block info. */
a->decmpfs_block_info =
(uint32_t *)(a->resource_fork + RSRC_H_SIZE);
/* Set the block count to the resource fork. */
archive_le32enc(a->decmpfs_block_info++, block_count);
/* Get the position where we are going to set compressed
* data. */
a->compressed_rsrc_position =
RSRC_H_SIZE + 4 + (block_count * 8);
a->compressed_rsrc_position_v = a->compressed_rsrc_position;
a->decmpfs_block_count = block_count;
}
/* Ignore redundant bytes. */
if (a->file_remaining_bytes == 0)
return ((ssize_t)size);
/* Do not overrun a block size. */
if (size > a->block_remaining_bytes)
bytes_to_write = a->block_remaining_bytes;
else
bytes_to_write = size;
/* Do not overrun the file size. */
if (bytes_to_write > a->file_remaining_bytes)
bytes_to_write = a->file_remaining_bytes;
/* For efficiency, if a copy length is full of the uncompressed
* buffer size, do not copy writing data to it. */
if (bytes_to_write == MAX_DECMPFS_BLOCK_SIZE)
buffer_to_write = buff;
else {
memcpy(a->uncompressed_buffer +
MAX_DECMPFS_BLOCK_SIZE - a->block_remaining_bytes,
buff, bytes_to_write);
buffer_to_write = a->uncompressed_buffer;
}
a->block_remaining_bytes -= bytes_to_write;
a->file_remaining_bytes -= bytes_to_write;
if (a->block_remaining_bytes == 0 || a->file_remaining_bytes == 0) {
ret = hfs_drive_compressor(a, buffer_to_write,
MAX_DECMPFS_BLOCK_SIZE - a->block_remaining_bytes);
if (ret < 0)
return (ret);
a->block_remaining_bytes = MAX_DECMPFS_BLOCK_SIZE;
}
/* Ignore redundant bytes. */
if (a->file_remaining_bytes == 0)
return ((ssize_t)size);
return (bytes_to_write);
}
static ssize_t
hfs_write_data_block(struct archive_write_disk *a, const char *buff,
size_t size)
{
uint64_t start_size = size;
ssize_t bytes_written = 0;
ssize_t bytes_to_write;
if (size == 0)
return (ARCHIVE_OK);
if (a->filesize == 0 || a->fd < 0) {
archive_set_error(&a->archive, 0,
"Attempt to write to an empty file");
return (ARCHIVE_WARN);
}
/* If this write would run beyond the file size, truncate it. */
if (a->filesize >= 0 && (int64_t)(a->offset + size) > a->filesize)
start_size = size = (size_t)(a->filesize - a->offset);
/* Write the data. */
while (size > 0) {
bytes_to_write = size;
/* Seek if necessary to the specified offset. */
if (a->offset < a->fd_offset) {
/* Can't support backward move. */
archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
"Seek failed");
return (ARCHIVE_FATAL);
} else if (a->offset > a->fd_offset) {
int64_t skip = a->offset - a->fd_offset;
char nullblock[1024];
memset(nullblock, 0, sizeof(nullblock));
while (skip > 0) {
if (skip > (int64_t)sizeof(nullblock))
bytes_written = hfs_write_decmpfs_block(
a, nullblock, sizeof(nullblock));
else
bytes_written = hfs_write_decmpfs_block(
a, nullblock, skip);
if (bytes_written < 0) {
archive_set_error(&a->archive, errno,
"Write failed");
return (ARCHIVE_WARN);
}
skip -= bytes_written;
}
a->fd_offset = a->offset;
}
bytes_written =
hfs_write_decmpfs_block(a, buff, bytes_to_write);
if (bytes_written < 0)
return (bytes_written);
buff += bytes_written;
size -= bytes_written;
a->total_bytes_written += bytes_written;
a->offset += bytes_written;
a->fd_offset = a->offset;
}
return (start_size - size);
}
#else
static ssize_t
hfs_write_data_block(struct archive_write_disk *a, const char *buff,
size_t size)
{
return (write_data_block(a, buff, size));
}
#endif
static ssize_t
_archive_write_disk_data_block(struct archive *_a,
const void *buff, size_t size, int64_t offset)
{
struct archive_write_disk *a = (struct archive_write_disk *)_a;
ssize_t r;
archive_check_magic(&a->archive, ARCHIVE_WRITE_DISK_MAGIC,
ARCHIVE_STATE_DATA, "archive_write_data_block");
a->offset = offset;
if (a->todo & TODO_HFS_COMPRESSION)
r = hfs_write_data_block(a, buff, size);
else
r = write_data_block(a, buff, size);
if (r < ARCHIVE_OK)
return (r);
if ((size_t)r < size) {
archive_set_error(&a->archive, 0,
"Too much data: Truncating file at %ju bytes",
(uintmax_t)a->filesize);
return (ARCHIVE_WARN);
}
#if ARCHIVE_VERSION_NUMBER < 3999000
return (ARCHIVE_OK);
#else
return (size);
#endif
}
static ssize_t
_archive_write_disk_data(struct archive *_a, const void *buff, size_t size)
{
struct archive_write_disk *a = (struct archive_write_disk *)_a;
archive_check_magic(&a->archive, ARCHIVE_WRITE_DISK_MAGIC,
ARCHIVE_STATE_DATA, "archive_write_data");
if (a->todo & TODO_HFS_COMPRESSION)
return (hfs_write_data_block(a, buff, size));
return (write_data_block(a, buff, size));
}
static int
_archive_write_disk_finish_entry(struct archive *_a)
{
struct archive_write_disk *a = (struct archive_write_disk *)_a;
int ret = ARCHIVE_OK;
archive_check_magic(&a->archive, ARCHIVE_WRITE_DISK_MAGIC,
ARCHIVE_STATE_HEADER | ARCHIVE_STATE_DATA,
"archive_write_finish_entry");
if (a->archive.state & ARCHIVE_STATE_HEADER)
return (ARCHIVE_OK);
archive_clear_error(&a->archive);
/* Pad or truncate file to the right size. */
if (a->fd < 0) {
/* There's no file. */
} else if (a->filesize < 0) {
/* File size is unknown, so we can't set the size. */
} else if (a->fd_offset == a->filesize) {
/* Last write ended at exactly the filesize; we're done. */
/* Hopefully, this is the common case. */
#if defined(__APPLE__) && defined(UF_COMPRESSED) && defined(HAVE_ZLIB_H)
} else if (a->todo & TODO_HFS_COMPRESSION) {
char null_d[1024];
ssize_t r;
if (a->file_remaining_bytes)
memset(null_d, 0, sizeof(null_d));
while (a->file_remaining_bytes) {
if (a->file_remaining_bytes > sizeof(null_d))
r = hfs_write_data_block(
a, null_d, sizeof(null_d));
else
r = hfs_write_data_block(
a, null_d, a->file_remaining_bytes);
if (r < 0)
return ((int)r);
}
#endif
} else {
#if HAVE_FTRUNCATE
if (ftruncate(a->fd, a->filesize) == -1 &&
a->filesize == 0) {
archive_set_error(&a->archive, errno,
"File size could not be restored");
return (ARCHIVE_FAILED);
}
#endif
/*
* Not all platforms implement the XSI option to
* extend files via ftruncate. Stat() the file again
* to see what happened.
*/
a->pst = NULL;
if ((ret = lazy_stat(a)) != ARCHIVE_OK)
return (ret);
/* We can use lseek()/write() to extend the file if
* ftruncate didn't work or isn't available. */
if (a->st.st_size < a->filesize) {
const char nul = '\0';
if (lseek(a->fd, a->filesize - 1, SEEK_SET) < 0) {
archive_set_error(&a->archive, errno,
"Seek failed");
return (ARCHIVE_FATAL);
}
if (write(a->fd, &nul, 1) < 0) {
archive_set_error(&a->archive, errno,
"Write to restore size failed");
return (ARCHIVE_FATAL);
}
a->pst = NULL;
}
}
/* Restore metadata. */
/*
* This is specific to Mac OS X.
* If the current file is an AppleDouble file, it should be
* linked with the data fork file and remove it.
*/
if (a->todo & TODO_APPLEDOUBLE) {
int r2 = fixup_appledouble(a, a->name);
if (r2 == ARCHIVE_EOF) {
/* The current file has been successfully linked
* with the data fork file and removed. So there
* is nothing to do on the current file. */
goto finish_metadata;
}
if (r2 < ret) ret = r2;
}
/*
* Look up the "real" UID only if we're going to need it.
* TODO: the TODO_SGID condition can be dropped here, can't it?
*/
if (a->todo & (TODO_OWNER | TODO_SUID | TODO_SGID)) {
a->uid = archive_write_disk_uid(&a->archive,
archive_entry_uname(a->entry),
archive_entry_uid(a->entry));
}
/* Look up the "real" GID only if we're going to need it. */
/* TODO: the TODO_SUID condition can be dropped here, can't it? */
if (a->todo & (TODO_OWNER | TODO_SGID | TODO_SUID)) {
a->gid = archive_write_disk_gid(&a->archive,
archive_entry_gname(a->entry),
archive_entry_gid(a->entry));
}
/*
* Restore ownership before set_mode tries to restore suid/sgid
* bits. If we set the owner, we know what it is and can skip
* a stat() call to examine the ownership of the file on disk.
*/
if (a->todo & TODO_OWNER) {
int r2 = set_ownership(a);
if (r2 < ret) ret = r2;
}
/*
* HYPOTHESIS:
* If we're not root, we won't be setting any security
* attributes that may be wiped by the set_mode() routine
* below. We also can't set xattr on non-owner-writable files,
* which may be the state after set_mode(). Perform
* set_xattrs() first based on these constraints.
*/
if (a->user_uid != 0 &&
(a->todo & TODO_XATTR)) {
int r2 = set_xattrs(a);
if (r2 < ret) ret = r2;
}
/*
* set_mode must precede ACLs on systems such as Solaris and
* FreeBSD where setting the mode implicitly clears extended ACLs
*/
if (a->todo & TODO_MODE) {
int r2 = set_mode(a, a->mode);
if (r2 < ret) ret = r2;
}
/*
* Security-related extended attributes (such as
* security.capability on Linux) have to be restored last,
* since they're implicitly removed by other file changes.
* We do this last only when root.
*/
if (a->user_uid == 0 &&
(a->todo & TODO_XATTR)) {
int r2 = set_xattrs(a);
if (r2 < ret) ret = r2;
}
/*
* Some flags prevent file modification; they must be restored after
* file contents are written.
*/
if (a->todo & TODO_FFLAGS) {
int r2 = set_fflags(a);
if (r2 < ret) ret = r2;
}
/*
* Time must follow most other metadata;
* otherwise atime will get changed.
*/
if (a->todo & TODO_TIMES) {
int r2 = set_times_from_entry(a);
if (r2 < ret) ret = r2;
}
/*
* Mac extended metadata includes ACLs.
*/
if (a->todo & TODO_MAC_METADATA) {
const void *metadata;
size_t metadata_size;
metadata = archive_entry_mac_metadata(a->entry, &metadata_size);
if (metadata != NULL && metadata_size > 0) {
int r2 = set_mac_metadata(a, archive_entry_pathname(
a->entry), metadata, metadata_size);
if (r2 < ret) ret = r2;
}
}
/*
* ACLs must be restored after timestamps because there are
* ACLs that prevent attribute changes (including time).
*/
if (a->todo & TODO_ACLS) {
int r2;
r2 = archive_write_disk_set_acls(&a->archive, a->fd,
archive_entry_pathname(a->entry),
archive_entry_acl(a->entry),
archive_entry_mode(a->entry));
if (r2 < ret) ret = r2;
}
finish_metadata:
/* If there's an fd, we can close it now. */
if (a->fd >= 0) {
close(a->fd);
a->fd = -1;
if (a->tmpname) {
if (rename(a->tmpname, a->name) == -1) {
archive_set_error(&a->archive, errno,
"Failed to rename temporary file");
ret = ARCHIVE_FAILED;
unlink(a->tmpname);
}
a->tmpname = NULL;
}
}
/* If there's an entry, we can release it now. */
archive_entry_free(a->entry);
a->entry = NULL;
a->archive.state = ARCHIVE_STATE_HEADER;
return (ret);
}
int
archive_write_disk_set_group_lookup(struct archive *_a,
void *private_data,
la_int64_t (*lookup_gid)(void *private, const char *gname, la_int64_t gid),
void (*cleanup_gid)(void *private))
{
struct archive_write_disk *a = (struct archive_write_disk *)_a;
archive_check_magic(&a->archive, ARCHIVE_WRITE_DISK_MAGIC,
ARCHIVE_STATE_ANY, "archive_write_disk_set_group_lookup");
if (a->cleanup_gid != NULL && a->lookup_gid_data != NULL)
(a->cleanup_gid)(a->lookup_gid_data);
a->lookup_gid = lookup_gid;
a->cleanup_gid = cleanup_gid;
a->lookup_gid_data = private_data;
return (ARCHIVE_OK);
}
int
archive_write_disk_set_user_lookup(struct archive *_a,
void *private_data,
int64_t (*lookup_uid)(void *private, const char *uname, int64_t uid),
void (*cleanup_uid)(void *private))
{
struct archive_write_disk *a = (struct archive_write_disk *)_a;
archive_check_magic(&a->archive, ARCHIVE_WRITE_DISK_MAGIC,
ARCHIVE_STATE_ANY, "archive_write_disk_set_user_lookup");
if (a->cleanup_uid != NULL && a->lookup_uid_data != NULL)
(a->cleanup_uid)(a->lookup_uid_data);
a->lookup_uid = lookup_uid;
a->cleanup_uid = cleanup_uid;
a->lookup_uid_data = private_data;
return (ARCHIVE_OK);
}
int64_t
archive_write_disk_gid(struct archive *_a, const char *name, la_int64_t id)
{
struct archive_write_disk *a = (struct archive_write_disk *)_a;
archive_check_magic(&a->archive, ARCHIVE_WRITE_DISK_MAGIC,
ARCHIVE_STATE_ANY, "archive_write_disk_gid");
if (a->lookup_gid)
return (a->lookup_gid)(a->lookup_gid_data, name, id);
return (id);
}
int64_t
archive_write_disk_uid(struct archive *_a, const char *name, la_int64_t id)
{
struct archive_write_disk *a = (struct archive_write_disk *)_a;
archive_check_magic(&a->archive, ARCHIVE_WRITE_DISK_MAGIC,
ARCHIVE_STATE_ANY, "archive_write_disk_uid");
if (a->lookup_uid)
return (a->lookup_uid)(a->lookup_uid_data, name, id);
return (id);
}
/*
* Create a new archive_write_disk object and initialize it with global state.
*/
struct archive *
archive_write_disk_new(void)
{
struct archive_write_disk *a;
a = (struct archive_write_disk *)calloc(1, sizeof(*a));
if (a == NULL)
return (NULL);
a->archive.magic = ARCHIVE_WRITE_DISK_MAGIC;
/* We're ready to write a header immediately. */
a->archive.state = ARCHIVE_STATE_HEADER;
a->archive.vtable = &archive_write_disk_vtable;
a->start_time = time(NULL);
/* Query and restore the umask. */
umask(a->user_umask = umask(0));
#ifdef HAVE_GETEUID
a->user_uid = geteuid();
#endif /* HAVE_GETEUID */
if (archive_string_ensure(&a->path_safe, 512) == NULL) {
free(a);
return (NULL);
}
#ifdef HAVE_ZLIB_H
a->decmpfs_compression_level = 5;
#endif
return (&a->archive);
}
/*
* If pathname is longer than PATH_MAX, chdir to a suitable
* intermediate dir and edit the path down to a shorter suffix. Note
* that this routine never returns an error; if the chdir() attempt
* fails for any reason, we just go ahead with the long pathname. The
* object creation is likely to fail, but any error will get handled
* at that time.
*/
#if defined(HAVE_FCHDIR) && defined(PATH_MAX)
static void
edit_deep_directories(struct archive_write_disk *a)
{
int ret;
char *tail = a->name;
/* If path is short, avoid the open() below. */
if (strlen(tail) < PATH_MAX)
return;
/* Try to record our starting dir. */
a->restore_pwd = la_opendirat(AT_FDCWD, ".");
__archive_ensure_cloexec_flag(a->restore_pwd);
if (a->restore_pwd < 0)
return;
/* As long as the path is too long... */
while (strlen(tail) >= PATH_MAX) {
/* Locate a dir prefix shorter than PATH_MAX. */
tail += PATH_MAX - 8;
while (tail > a->name && *tail != '/')
tail--;
/* Exit if we find a too-long path component. */
if (tail <= a->name)
return;
/* Create the intermediate dir and chdir to it. */
*tail = '\0'; /* Terminate dir portion */
ret = create_dir(a, a->name);
if (ret == ARCHIVE_OK && chdir(a->name) != 0)
ret = ARCHIVE_FAILED;
*tail = '/'; /* Restore the / we removed. */
if (ret != ARCHIVE_OK)
return;
tail++;
/* The chdir() succeeded; we've now shortened the path. */
a->name = tail;
}
return;
}
#endif
/*
* The main restore function.
*/
static int
restore_entry(struct archive_write_disk *a)
{
int ret = ARCHIVE_OK, en;
if (a->flags & ARCHIVE_EXTRACT_UNLINK && !S_ISDIR(a->mode)) {
/*
* TODO: Fix this. Apparently, there are platforms
* that still allow root to hose the entire filesystem
* by unlinking a dir. The S_ISDIR() test above
* prevents us from using unlink() here if the new
* object is a dir, but that doesn't mean the old
* object isn't a dir.
*/
if (a->flags & ARCHIVE_EXTRACT_CLEAR_NOCHANGE_FFLAGS)
(void)clear_nochange_fflags(a);
if (unlink(a->name) == 0) {
/* We removed it, reset cached stat. */
a->pst = NULL;
} else if (errno == ENOENT) {
/* File didn't exist, that's just as good. */
} else if (rmdir(a->name) == 0) {
/* It was a dir, but now it's gone. */
a->pst = NULL;
} else {
/* We tried, but couldn't get rid of it. */
archive_set_error(&a->archive, errno,
"Could not unlink");
return(ARCHIVE_FAILED);
}
}
/* Try creating it first; if this fails, we'll try to recover. */
en = create_filesystem_object(a);
if ((en == ENOTDIR || en == ENOENT)
&& !(a->flags & ARCHIVE_EXTRACT_NO_AUTODIR)) {
/* If the parent dir doesn't exist, try creating it. */
create_parent_dir(a, a->name);
/* Now try to create the object again. */
en = create_filesystem_object(a);
}
if ((en == ENOENT) && (archive_entry_hardlink(a->entry) != NULL)) {
archive_set_error(&a->archive, en,
"Hard-link target '%s' does not exist.",
archive_entry_hardlink(a->entry));
return (ARCHIVE_FAILED);
}
if ((en == EISDIR || en == EEXIST)
&& (a->flags & ARCHIVE_EXTRACT_NO_OVERWRITE)) {
/* If we're not overwriting, we're done. */
if (S_ISDIR(a->mode)) {
/* Don't overwrite any settings on existing directories. */
a->todo = 0;
}
archive_entry_unset_size(a->entry);
return (ARCHIVE_OK);
}
/*
* Some platforms return EISDIR if you call
* open(O_WRONLY | O_EXCL | O_CREAT) on a directory, some
* return EEXIST. POSIX is ambiguous, requiring EISDIR
* for open(O_WRONLY) on a dir and EEXIST for open(O_EXCL | O_CREAT)
* on an existing item.
*/
if (en == EISDIR) {
/* A dir is in the way of a non-dir, rmdir it. */
if (rmdir(a->name) != 0) {
archive_set_error(&a->archive, errno,
"Can't remove already-existing dir");
return (ARCHIVE_FAILED);
}
a->pst = NULL;
/* Try again. */
en = create_filesystem_object(a);
} else if (en == EEXIST) {
/*
* We know something is in the way, but we don't know what;
* we need to find out before we go any further.
*/
int r = 0;
/*
* The SECURE_SYMLINKS logic has already removed a
* symlink to a dir if the client wants that. So
* follow the symlink if we're creating a dir.
*/
if (S_ISDIR(a->mode))
r = la_stat(a->name, &a->st);
/*
* If it's not a dir (or it's a broken symlink),
* then don't follow it.
*/
if (r != 0 || !S_ISDIR(a->mode))
r = lstat(a->name, &a->st);
if (r != 0) {
archive_set_error(&a->archive, errno,
"Can't stat existing object");
return (ARCHIVE_FAILED);
}
/*
* NO_OVERWRITE_NEWER doesn't apply to directories.
*/
if ((a->flags & ARCHIVE_EXTRACT_NO_OVERWRITE_NEWER)
&& !S_ISDIR(a->st.st_mode)) {
if (!older(&(a->st), a->entry)) {
archive_entry_unset_size(a->entry);
return (ARCHIVE_OK);
}
}
/* If it's our archive, we're done. */
if (a->skip_file_set &&
a->st.st_dev == (dev_t)a->skip_file_dev &&
a->st.st_ino == (ino_t)a->skip_file_ino) {
archive_set_error(&a->archive, 0,
"Refusing to overwrite archive");
return (ARCHIVE_FAILED);
}
if (!S_ISDIR(a->st.st_mode)) {
if (a->flags & ARCHIVE_EXTRACT_CLEAR_NOCHANGE_FFLAGS)
(void)clear_nochange_fflags(a);
if ((a->flags & ARCHIVE_EXTRACT_SAFE_WRITES) &&
S_ISREG(a->st.st_mode)) {
/* Use a temporary file to extract */
if ((a->fd = la_mktemp(a)) == -1) {
archive_set_error(&a->archive, errno,
"Can't create temporary file");
return ARCHIVE_FAILED;
}
a->pst = NULL;
en = 0;
} else {
/* A non-dir is in the way, unlink it. */
if (unlink(a->name) != 0) {
archive_set_error(&a->archive, errno,
"Can't unlink already-existing "
"object");
return (ARCHIVE_FAILED);
}
a->pst = NULL;
/* Try again. */
en = create_filesystem_object(a);
}
} else if (!S_ISDIR(a->mode)) {
/* A dir is in the way of a non-dir, rmdir it. */
if (a->flags & ARCHIVE_EXTRACT_CLEAR_NOCHANGE_FFLAGS)
(void)clear_nochange_fflags(a);
if (rmdir(a->name) != 0) {
archive_set_error(&a->archive, errno,
"Can't replace existing directory with non-directory");
return (ARCHIVE_FAILED);
}
/* Try again. */
en = create_filesystem_object(a);
} else {
/*
* There's a dir in the way of a dir. Don't
* waste time with rmdir()/mkdir(), just fix
* up the permissions on the existing dir.
* Note that we don't change perms on existing
* dirs unless _EXTRACT_PERM is specified.
*/
if ((a->mode != a->st.st_mode)
&& (a->todo & TODO_MODE_FORCE))
a->deferred |= (a->todo & TODO_MODE);
/* Ownership doesn't need deferred fixup. */
en = 0; /* Forget the EEXIST. */
}
}
if (en) {
/* Everything failed; give up here. */
if ((&a->archive)->error == NULL)
archive_set_error(&a->archive, en, "Can't create '%s'",
a->name);
return (ARCHIVE_FAILED);
}
a->pst = NULL; /* Cached stat data no longer valid. */
return (ret);
}
/*
* Returns 0 if creation succeeds, or else returns errno value from
* the failed system call. Note: This function should only ever perform
* a single system call.
*/
static int
create_filesystem_object(struct archive_write_disk *a)
{
/* Create the entry. */
const char *linkname;
mode_t final_mode, mode;
int r;
/* these for check_symlinks_fsobj */
char *linkname_copy; /* non-const copy of linkname */
struct stat st;
struct archive_string error_string;
int error_number;
/* We identify hard/symlinks according to the link names. */
/* Since link(2) and symlink(2) don't handle modes, we're done here. */
linkname = archive_entry_hardlink(a->entry);
if (linkname != NULL) {
#if !HAVE_LINK
return (EPERM);
#else
archive_string_init(&error_string);
linkname_copy = strdup(linkname);
if (linkname_copy == NULL) {
return (EPERM);
}
/*
* TODO: consider using the cleaned-up path as the link
* target?
*/
r = cleanup_pathname_fsobj(linkname_copy, &error_number,
&error_string, a->flags);
if (r != ARCHIVE_OK) {
archive_set_error(&a->archive, error_number, "%s",
error_string.s);
free(linkname_copy);
archive_string_free(&error_string);
/*
* EPERM is more appropriate than error_number for our
* callers
*/
return (EPERM);
}
r = check_symlinks_fsobj(linkname_copy, &error_number,
&error_string, a->flags, 1);
if (r != ARCHIVE_OK) {
archive_set_error(&a->archive, error_number, "%s",
error_string.s);
free(linkname_copy);
archive_string_free(&error_string);
/*
* EPERM is more appropriate than error_number for our
* callers
*/
return (EPERM);
}
free(linkname_copy);
archive_string_free(&error_string);
/*
* Unlinking and linking here is really not atomic,
* but doing it right, would require us to construct
* an mktemplink() function, and then use rename(2).
*/
if (a->flags & ARCHIVE_EXTRACT_SAFE_WRITES)
unlink(a->name);
#ifdef HAVE_LINKAT
r = linkat(AT_FDCWD, linkname, AT_FDCWD, a->name,
0) ? errno : 0;
#else
r = link(linkname, a->name) ? errno : 0;
#endif
/*
* New cpio and pax formats allow hardlink entries
* to carry data, so we may have to open the file
* for hardlink entries.
*
* If the hardlink was successfully created and
* the archive doesn't have carry data for it,
* consider it to be non-authoritative for meta data.
* This is consistent with GNU tar and BSD pax.
* If the hardlink does carry data, let the last
* archive entry decide ownership.
*/
if (r == 0 && a->filesize <= 0) {
a->todo = 0;
a->deferred = 0;
} else if (r == 0 && a->filesize > 0) {
#ifdef HAVE_LSTAT
r = lstat(a->name, &st);
#else
r = la_stat(a->name, &st);
#endif
if (r != 0)
r = errno;
else if ((st.st_mode & AE_IFMT) == AE_IFREG) {
a->fd = open(a->name, O_WRONLY | O_TRUNC |
O_BINARY | O_CLOEXEC | O_NOFOLLOW);
__archive_ensure_cloexec_flag(a->fd);
if (a->fd < 0)
r = errno;
}
}
return (r);
#endif
}
linkname = archive_entry_symlink(a->entry);
if (linkname != NULL) {
#if HAVE_SYMLINK
/*
* Unlinking and linking here is really not atomic,
* but doing it right, would require us to construct
* an mktempsymlink() function, and then use rename(2).
*/
if (a->flags & ARCHIVE_EXTRACT_SAFE_WRITES)
unlink(a->name);
return symlink(linkname, a->name) ? errno : 0;
#else
return (EPERM);
#endif
}
/*
* The remaining system calls all set permissions, so let's
* try to take advantage of that to avoid an extra chmod()
* call. (Recall that umask is set to zero right now!)
*/
/* Mode we want for the final restored object (w/o file type bits). */
final_mode = a->mode & 07777;
/*
* The mode that will actually be restored in this step. Note
* that SUID, SGID, etc, require additional work to ensure
* security, so we never restore them at this point.
*/
mode = final_mode & 0777 & ~a->user_umask;
/*
* Always create writable such that [f]setxattr() works if we're not
* root.
*/
if (a->user_uid != 0 &&
a->todo & (TODO_HFS_COMPRESSION | TODO_XATTR)) {
mode |= 0200;
}
switch (a->mode & AE_IFMT) {
default:
/* POSIX requires that we fall through here. */
/* FALLTHROUGH */
case AE_IFREG:
a->tmpname = NULL;
a->fd = open(a->name,
O_WRONLY | O_CREAT | O_EXCL | O_BINARY | O_CLOEXEC, mode);
__archive_ensure_cloexec_flag(a->fd);
r = (a->fd < 0);
break;
case AE_IFCHR:
#ifdef HAVE_MKNOD
/* Note: we use AE_IFCHR for the case label, and
* S_IFCHR for the mknod() call. This is correct. */
r = mknod(a->name, mode | S_IFCHR,
archive_entry_rdev(a->entry));
break;
#else
/* TODO: Find a better way to warn about our inability
* to restore a char device node. */
return (EINVAL);
#endif /* HAVE_MKNOD */
case AE_IFBLK:
#ifdef HAVE_MKNOD
r = mknod(a->name, mode | S_IFBLK,
archive_entry_rdev(a->entry));
break;
#else
/* TODO: Find a better way to warn about our inability
* to restore a block device node. */
return (EINVAL);
#endif /* HAVE_MKNOD */
case AE_IFDIR:
mode = (mode | MINIMUM_DIR_MODE) & MAXIMUM_DIR_MODE;
r = mkdir(a->name, mode);
if (r == 0) {
/* Defer setting dir times. */
a->deferred |= (a->todo & TODO_TIMES);
a->todo &= ~TODO_TIMES;
/* Never use an immediate chmod(). */
/* We can't avoid the chmod() entirely if EXTRACT_PERM
* because of SysV SGID inheritance. */
if ((mode != final_mode)
|| (a->flags & ARCHIVE_EXTRACT_PERM))
a->deferred |= (a->todo & TODO_MODE);
a->todo &= ~TODO_MODE;
}
break;
case AE_IFIFO:
#ifdef HAVE_MKFIFO
r = mkfifo(a->name, mode);
break;
#else
/* TODO: Find a better way to warn about our inability
* to restore a fifo. */
return (EINVAL);
#endif /* HAVE_MKFIFO */
}
/* All the system calls above set errno on failure. */
if (r)
return (errno);
/* If we managed to set the final mode, we've avoided a chmod(). */
if (mode == final_mode)
a->todo &= ~TODO_MODE;
return (0);
}
/*
* Cleanup function for archive_extract. Mostly, this involves processing
* the fixup list, which is used to address a number of problems:
* * Dir permissions might prevent us from restoring a file in that
* dir, so we restore the dir with minimum 0700 permissions first,
* then correct the mode at the end.
* * Similarly, the act of restoring a file touches the directory
* and changes the timestamp on the dir, so we have to touch-up dir
* timestamps at the end as well.
* * Some file flags can interfere with the restore by, for example,
* preventing the creation of hardlinks to those files.
* * Mac OS extended metadata includes ACLs, so must be deferred on dirs.
*
* Note that tar/cpio do not require that archives be in a particular
* order; there is no way to know when the last file has been restored
* within a directory, so there's no way to optimize the memory usage
* here by fixing up the directory any earlier than the
* end-of-archive.
*
* XXX TODO: Directory ACLs should be restored here, for the same
* reason we set directory perms here. XXX
*/
static int
_archive_write_disk_close(struct archive *_a)
{
struct archive_write_disk *a = (struct archive_write_disk *)_a;
struct fixup_entry *next, *p;
struct stat st;
char *c;
int fd, ret, openflags;
archive_check_magic(&a->archive, ARCHIVE_WRITE_DISK_MAGIC,
ARCHIVE_STATE_HEADER | ARCHIVE_STATE_DATA,
"archive_write_disk_close");
ret = _archive_write_disk_finish_entry(&a->archive);
/* Sort dir list so directories are fixed up in depth-first order. */
p = sort_dir_list(a->fixup_list);
while (p != NULL) {
fd = -1;
a->pst = NULL; /* Mark stat cache as out-of-date. */
/* We must strip trailing slashes from the path to avoid
dereferencing symbolic links to directories */
c = p->name;
while (*c != '\0')
c++;
while (c != p->name && *(c - 1) == '/') {
c--;
*c = '\0';
}
if (p->fixup == 0)
goto skip_fixup_entry;
else {
/*
* We need to verify if the type of the file
* we are going to open matches the file type
* of the fixup entry.
*/
openflags = O_BINARY | O_NOFOLLOW | O_RDONLY
| O_CLOEXEC;
#if defined(O_DIRECTORY)
if (p->filetype == AE_IFDIR)
openflags |= O_DIRECTORY;
#endif
fd = open(p->name, openflags);
#if defined(O_DIRECTORY)
/*
* If we support O_DIRECTORY and open was
* successful we can skip the file type check
* for directories. For other file types
* we need to verify via fstat() or lstat()
*/
if (fd == -1 || p->filetype != AE_IFDIR) {
#if HAVE_FSTAT
if (fd > 0 && (
fstat(fd, &st) != 0 ||
la_verify_filetype(st.st_mode,
p->filetype) == 0)) {
goto skip_fixup_entry;
} else
#endif
if (lstat(p->name, &st) != 0 ||
la_verify_filetype(st.st_mode,
p->filetype) == 0) {
goto skip_fixup_entry;
}
}
#else
#if HAVE_FSTAT
if (fd > 0 && (
fstat(fd, &st) != 0 ||
la_verify_filetype(st.st_mode,
p->filetype) == 0)) {
goto skip_fixup_entry;
} else
#endif
if (lstat(p->name, &st) != 0 ||
la_verify_filetype(st.st_mode,
p->filetype) == 0) {
goto skip_fixup_entry;
}
#endif
}
if (p->fixup & TODO_TIMES) {
set_times(a, fd, p->mode, p->name,
p->atime, p->atime_nanos,
p->birthtime, p->birthtime_nanos,
p->mtime, p->mtime_nanos,
p->ctime, p->ctime_nanos);
}
if (p->fixup & TODO_MODE_BASE) {
#ifdef HAVE_FCHMOD
if (fd >= 0)
fchmod(fd, p->mode & 07777);
else
#endif
#ifdef HAVE_LCHMOD
lchmod(p->name, p->mode & 07777);
#else
chmod(p->name, p->mode & 07777);
#endif
}
if (p->fixup & TODO_ACLS)
archive_write_disk_set_acls(&a->archive, fd,
p->name, &p->acl, p->mode);
if (p->fixup & TODO_FFLAGS)
set_fflags_platform(a, fd, p->name,
p->mode, p->fflags_set, 0);
if (p->fixup & TODO_MAC_METADATA)
set_mac_metadata(a, p->name, p->mac_metadata,
p->mac_metadata_size);
skip_fixup_entry:
next = p->next;
archive_acl_clear(&p->acl);
free(p->mac_metadata);
free(p->name);
if (fd >= 0)
close(fd);
free(p);
p = next;
}
a->fixup_list = NULL;
return (ret);
}
static int
_archive_write_disk_free(struct archive *_a)
{
struct archive_write_disk *a;
int ret;
if (_a == NULL)
return (ARCHIVE_OK);
archive_check_magic(_a, ARCHIVE_WRITE_DISK_MAGIC,
ARCHIVE_STATE_ANY | ARCHIVE_STATE_FATAL, "archive_write_disk_free");
a = (struct archive_write_disk *)_a;
ret = _archive_write_disk_close(&a->archive);
archive_write_disk_set_group_lookup(&a->archive, NULL, NULL, NULL);
archive_write_disk_set_user_lookup(&a->archive, NULL, NULL, NULL);
archive_entry_free(a->entry);
archive_string_free(&a->_name_data);
archive_string_free(&a->_tmpname_data);
archive_string_free(&a->archive.error_string);
archive_string_free(&a->path_safe);
a->archive.magic = 0;
__archive_clean(&a->archive);
free(a->decmpfs_header_p);
free(a->resource_fork);
free(a->compressed_buffer);
free(a->uncompressed_buffer);
#if defined(__APPLE__) && defined(UF_COMPRESSED) && defined(HAVE_SYS_XATTR_H)\
&& defined(HAVE_ZLIB_H)
if (a->stream_valid) {
switch (deflateEnd(&a->stream)) {
case Z_OK:
break;
default:
archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
"Failed to clean up compressor");
ret = ARCHIVE_FATAL;
break;
}
}
#endif
free(a);
return (ret);
}
/*
* Simple O(n log n) merge sort to order the fixup list. In
* particular, we want to restore dir timestamps depth-first.
*/
static struct fixup_entry *
sort_dir_list(struct fixup_entry *p)
{
struct fixup_entry *a, *b, *t;
if (p == NULL)
return (NULL);
/* A one-item list is already sorted. */
if (p->next == NULL)
return (p);
/* Step 1: split the list. */
t = p;
a = p->next->next;
while (a != NULL) {
/* Step a twice, t once. */
a = a->next;
if (a != NULL)
a = a->next;
t = t->next;
}
/* Now, t is at the mid-point, so break the list here. */
b = t->next;
t->next = NULL;
a = p;
/* Step 2: Recursively sort the two sub-lists. */
a = sort_dir_list(a);
b = sort_dir_list(b);
/* Step 3: Merge the returned lists. */
/* Pick the first element for the merged list. */
if (strcmp(a->name, b->name) > 0) {
t = p = a;
a = a->next;
} else {
t = p = b;
b = b->next;
}
/* Always put the later element on the list first. */
while (a != NULL && b != NULL) {
if (strcmp(a->name, b->name) > 0) {
t->next = a;
a = a->next;
} else {
t->next = b;
b = b->next;
}
t = t->next;
}
/* Only one list is non-empty, so just splice it on. */
if (a != NULL)
t->next = a;
if (b != NULL)
t->next = b;
return (p);
}
/*
* Returns a new, initialized fixup entry.
*
* TODO: Reduce the memory requirements for this list by using a tree
* structure rather than a simple list of names.
*/
static struct fixup_entry *
new_fixup(struct archive_write_disk *a, const char *pathname)
{
struct fixup_entry *fe;
fe = (struct fixup_entry *)calloc(1, sizeof(struct fixup_entry));
if (fe == NULL) {
archive_set_error(&a->archive, ENOMEM,
"Can't allocate memory for a fixup");
return (NULL);
}
fe->next = a->fixup_list;
a->fixup_list = fe;
fe->fixup = 0;
fe->filetype = 0;
fe->name = strdup(pathname);
return (fe);
}
/*
* Returns a fixup structure for the current entry.
*/
static struct fixup_entry *
current_fixup(struct archive_write_disk *a, const char *pathname)
{
if (a->current_fixup == NULL)
a->current_fixup = new_fixup(a, pathname);
return (a->current_fixup);
}
/* Error helper for new *_fsobj functions */
static void
fsobj_error(int *a_eno, struct archive_string *a_estr,
int err, const char *errstr, const char *path)
{
if (a_eno)
*a_eno = err;
if (a_estr)
archive_string_sprintf(a_estr, "%s%s", errstr, path);
}
/*
* TODO: Someday, integrate this with the deep dir support; they both
* scan the path and both can be optimized by comparing against other
* recent paths.
*/
/*
* Checks the given path to see if any elements along it are symlinks. Returns
* ARCHIVE_OK if there are none, otherwise puts an error in errmsg.
*/
static int
check_symlinks_fsobj(char *path, int *a_eno, struct archive_string *a_estr,
int flags, int checking_linkname)
{
#if !defined(HAVE_LSTAT) && \
!(defined(HAVE_OPENAT) && defined(HAVE_FSTATAT) && defined(HAVE_UNLINKAT))
/* Platform doesn't have lstat, so we can't look for symlinks. */
(void)path; /* UNUSED */
(void)error_number; /* UNUSED */
(void)error_string; /* UNUSED */
(void)flags; /* UNUSED */
(void)checking_linkname; /* UNUSED */
return (ARCHIVE_OK);
#else
int res = ARCHIVE_OK;
char *tail;
char *head;
int last;
char c;
int r;
struct stat st;
int chdir_fd;
#if defined(HAVE_OPENAT) && defined(HAVE_FSTATAT) && defined(HAVE_UNLINKAT)
int fd;
#endif
/* Nothing to do here if name is empty */
if(path[0] == '\0')
return (ARCHIVE_OK);
/*
* Guard against symlink tricks. Reject any archive entry whose
* destination would be altered by a symlink.
*
* Walk the filename in chunks separated by '/'. For each segment:
* - if it doesn't exist, continue
* - if it's symlink, abort or remove it
* - if it's a directory and it's not the last chunk, cd into it
* As we go:
* head points to the current (relative) path
* tail points to the temporary \0 terminating the segment we're
* currently examining
* c holds what used to be in *tail
* last is 1 if this is the last tail
*/
chdir_fd = la_opendirat(AT_FDCWD, ".");
__archive_ensure_cloexec_flag(chdir_fd);
if (chdir_fd < 0) {
fsobj_error(a_eno, a_estr, errno,
"Could not open ", path);
return (ARCHIVE_FATAL);
}
head = path;
tail = path;
last = 0;
/* TODO: reintroduce a safe cache here? */
/* Skip the root directory if the path is absolute. */
if(tail == path && tail[0] == '/')
++tail;
/* Keep going until we've checked the entire name.
* head, tail, path all alias the same string, which is
* temporarily zeroed at tail, so be careful restoring the
* stashed (c=tail[0]) for error messages.
* Exiting the loop with break is okay; continue is not.
*/
while (!last) {
/*
* Skip the separator we just consumed, plus any adjacent ones
*/
while (*tail == '/')
++tail;
/* Skip the next path element. */
while (*tail != '\0' && *tail != '/')
++tail;
/* is this the last path component? */
last = (tail[0] == '\0') || (tail[0] == '/' && tail[1] == '\0');
/* temporarily truncate the string here */
c = tail[0];
tail[0] = '\0';
/* Check that we haven't hit a symlink. */
#if defined(HAVE_OPENAT) && defined(HAVE_FSTATAT) && defined(HAVE_UNLINKAT)
r = fstatat(chdir_fd, head, &st, AT_SYMLINK_NOFOLLOW);
#else
r = lstat(head, &st);
#endif
if (r != 0) {
tail[0] = c;
/* We've hit a dir that doesn't exist; stop now. */
if (errno == ENOENT) {
break;
} else {
/*
* Treat any other error as fatal - best to be
* paranoid here.
* Note: This effectively disables deep
* directory support when security checks are
* enabled. Otherwise, very long pathnames that
* trigger an error here could evade the
* sandbox.
* TODO: We could do better, but it would
* probably require merging the symlink checks
* with the deep-directory editing.
*/
fsobj_error(a_eno, a_estr, errno,
"Could not stat ", path);
res = ARCHIVE_FAILED;
break;
}
} else if (S_ISDIR(st.st_mode)) {
if (!last) {
#if defined(HAVE_OPENAT) && defined(HAVE_FSTATAT) && defined(HAVE_UNLINKAT)
fd = la_opendirat(chdir_fd, head);
if (fd < 0)
r = -1;
else {
r = 0;
close(chdir_fd);
chdir_fd = fd;
}
#else
r = chdir(head);
#endif
if (r != 0) {
tail[0] = c;
fsobj_error(a_eno, a_estr, errno,
"Could not chdir ", path);
res = (ARCHIVE_FATAL);
break;
}
/* Our view is now from inside this dir: */
head = tail + 1;
}
} else if (S_ISLNK(st.st_mode)) {
if (last && checking_linkname) {
#ifdef HAVE_LINKAT
/*
* Hardlinks to symlinks are safe to write
* if linkat() is supported as it does not
* follow symlinks.
*/
res = ARCHIVE_OK;
#else
/*
* We return ARCHIVE_FAILED here as we are
* not able to safely write hardlinks
* to symlinks.
*/
tail[0] = c;
fsobj_error(a_eno, a_estr, errno,
"Cannot write hardlink to symlink ",
path);
res = ARCHIVE_FAILED;
#endif
break;
} else
if (last) {
/*
* Last element is symlink; remove it
* so we can overwrite it with the
* item being extracted.
*/
#if defined(HAVE_OPENAT) && defined(HAVE_FSTATAT) && defined(HAVE_UNLINKAT)
r = unlinkat(chdir_fd, head, 0);
#else
r = unlink(head);
#endif
if (r != 0) {
tail[0] = c;
fsobj_error(a_eno, a_estr, errno,
"Could not remove symlink ",
path);
res = ARCHIVE_FAILED;
break;
}
/*
* Even if we did remove it, a warning
* is in order. The warning is silly,
* though, if we're just replacing one
* symlink with another symlink.
*/
tail[0] = c;
/*
* FIXME: not sure how important this is to
* restore
*/
/*
if (!S_ISLNK(path)) {
fsobj_error(a_eno, a_estr, 0,
"Removing symlink ", path);
}
*/
/* Symlink gone. No more problem! */
res = ARCHIVE_OK;
break;
} else if (flags & ARCHIVE_EXTRACT_UNLINK) {
/* User asked us to remove problems. */
#if defined(HAVE_OPENAT) && defined(HAVE_FSTATAT) && defined(HAVE_UNLINKAT)
r = unlinkat(chdir_fd, head, 0);
#else
r = unlink(head);
#endif
if (r != 0) {
tail[0] = c;
fsobj_error(a_eno, a_estr, 0,
"Cannot remove intervening "
"symlink ", path);
res = ARCHIVE_FAILED;
break;
}
tail[0] = c;
} else if ((flags &
ARCHIVE_EXTRACT_SECURE_SYMLINKS) == 0) {
/*
* We are not the last element and we want to
* follow symlinks if they are a directory.
*
* This is needed to extract hardlinks over
* symlinks.
*/
#if defined(HAVE_OPENAT) && defined(HAVE_FSTATAT) && defined(HAVE_UNLINKAT)
r = fstatat(chdir_fd, head, &st, 0);
#else
r = la_stat(head, &st);
#endif
if (r != 0) {
tail[0] = c;
if (errno == ENOENT) {
break;
} else {
fsobj_error(a_eno, a_estr,
errno,
"Could not stat ", path);
res = (ARCHIVE_FAILED);
break;
}
} else if (S_ISDIR(st.st_mode)) {
#if defined(HAVE_OPENAT) && defined(HAVE_FSTATAT) && defined(HAVE_UNLINKAT)
fd = la_opendirat(chdir_fd, head);
if (fd < 0)
r = -1;
else {
r = 0;
close(chdir_fd);
chdir_fd = fd;
}
#else
r = chdir(head);
#endif
if (r != 0) {
tail[0] = c;
fsobj_error(a_eno, a_estr,
errno,
"Could not chdir ", path);
res = (ARCHIVE_FATAL);
break;
}
/*
* Our view is now from inside
* this dir:
*/
head = tail + 1;
} else {
tail[0] = c;
fsobj_error(a_eno, a_estr, 0,
"Cannot extract through "
"symlink ", path);
res = ARCHIVE_FAILED;
break;
}
} else {
tail[0] = c;
fsobj_error(a_eno, a_estr, 0,
"Cannot extract through symlink ", path);
res = ARCHIVE_FAILED;
break;
}
}
/* be sure to always maintain this */
tail[0] = c;
if (tail[0] != '\0')
tail++; /* Advance to the next segment. */
}
/* Catches loop exits via break */
tail[0] = c;
#if defined(HAVE_OPENAT) && defined(HAVE_FSTATAT) && defined(HAVE_UNLINKAT)
/* If we operate with openat(), fstatat() and unlinkat() there was
* no chdir(), so just close the fd */
if (chdir_fd >= 0)
close(chdir_fd);
#elif HAVE_FCHDIR
/* If we changed directory above, restore it here. */
if (chdir_fd >= 0) {
r = fchdir(chdir_fd);
if (r != 0) {
fsobj_error(a_eno, a_estr, errno,
"chdir() failure", "");
}
close(chdir_fd);
chdir_fd = -1;
if (r != 0) {
res = (ARCHIVE_FATAL);
}
}
#endif
/* TODO: reintroduce a safe cache here? */
return res;
#endif
}
/*
* Check a->name for symlinks, returning ARCHIVE_OK if its clean, otherwise
* calls archive_set_error and returns ARCHIVE_{FATAL,FAILED}
*/
static int
check_symlinks(struct archive_write_disk *a)
{
struct archive_string error_string;
int error_number;
int rc;
archive_string_init(&error_string);
rc = check_symlinks_fsobj(a->name, &error_number, &error_string,
a->flags, 0);
if (rc != ARCHIVE_OK) {
archive_set_error(&a->archive, error_number, "%s",
error_string.s);
}
archive_string_free(&error_string);
a->pst = NULL; /* to be safe */
return rc;
}
#if defined(__CYGWIN__)
/*
* 1. Convert a path separator from '\' to '/' .
* We shouldn't check multibyte character directly because some
* character-set have been using the '\' character for a part of
* its multibyte character code.
* 2. Replace unusable characters in Windows with underscore('_').
* See also : http://msdn.microsoft.com/en-us/library/aa365247.aspx
*/
static void
cleanup_pathname_win(char *path)
{
wchar_t wc;
char *p;
size_t alen, l;
int mb, complete, utf8;
alen = 0;
mb = 0;
complete = 1;
utf8 = (strcmp(nl_langinfo(CODESET), "UTF-8") == 0)? 1: 0;
for (p = path; *p != '\0'; p++) {
++alen;
if (*p == '\\') {
/* If previous byte is smaller than 128,
* this is not second byte of multibyte characters,
* so we can replace '\' with '/'. */
if (utf8 || !mb)
*p = '/';
else
complete = 0;/* uncompleted. */
} else if (*(unsigned char *)p > 127)
mb = 1;
else
mb = 0;
/* Rewrite the path name if its next character is unusable. */
if (*p == ':' || *p == '*' || *p == '?' || *p == '"' ||
*p == '<' || *p == '>' || *p == '|')
*p = '_';
}
if (complete)
return;
/*
* Convert path separator in wide-character.
*/
p = path;
while (*p != '\0' && alen) {
l = mbtowc(&wc, p, alen);
if (l == (size_t)-1) {
while (*p != '\0') {
if (*p == '\\')
*p = '/';
++p;
}
break;
}
if (l == 1 && wc == L'\\')
*p = '/';
p += l;
alen -= l;
}
}
#endif
/*
* Canonicalize the pathname. In particular, this strips duplicate
* '/' characters, '.' elements, and trailing '/'. It also raises an
* error for an empty path, a trailing '..', (if _SECURE_NODOTDOT is
* set) any '..' in the path or (if ARCHIVE_EXTRACT_SECURE_NOABSOLUTEPATHS
* is set) if the path is absolute.
*/
static int
cleanup_pathname_fsobj(char *path, int *a_eno, struct archive_string *a_estr,
int flags)
{
char *dest, *src;
char separator = '\0';
dest = src = path;
if (*src == '\0') {
fsobj_error(a_eno, a_estr, ARCHIVE_ERRNO_MISC,
"Invalid empty ", "pathname");
return (ARCHIVE_FAILED);
}
#if defined(__CYGWIN__)
cleanup_pathname_win(path);
#endif
/* Skip leading '/'. */
if (*src == '/') {
if (flags & ARCHIVE_EXTRACT_SECURE_NOABSOLUTEPATHS) {
fsobj_error(a_eno, a_estr, ARCHIVE_ERRNO_MISC,
"Path is ", "absolute");
return (ARCHIVE_FAILED);
}
separator = *src++;
}
/* Scan the pathname one element at a time. */
for (;;) {
/* src points to first char after '/' */
if (src[0] == '\0') {
break;
} else if (src[0] == '/') {
/* Found '//', ignore second one. */
src++;
continue;
} else if (src[0] == '.') {
if (src[1] == '\0') {
/* Ignore trailing '.' */
break;
} else if (src[1] == '/') {
/* Skip './'. */
src += 2;
continue;
} else if (src[1] == '.') {
if (src[2] == '/' || src[2] == '\0') {
/* Conditionally warn about '..' */
if (flags
& ARCHIVE_EXTRACT_SECURE_NODOTDOT) {
fsobj_error(a_eno, a_estr,
ARCHIVE_ERRNO_MISC,
"Path contains ", "'..'");
return (ARCHIVE_FAILED);
}
}
/*
* Note: Under no circumstances do we
* remove '..' elements. In
* particular, restoring
* '/foo/../bar/' should create the
* 'foo' dir as a side-effect.
*/
}
}
/* Copy current element, including leading '/'. */
if (separator)
*dest++ = '/';
while (*src != '\0' && *src != '/') {
*dest++ = *src++;
}
if (*src == '\0')
break;
/* Skip '/' separator. */
separator = *src++;
}
/*
* We've just copied zero or more path elements, not including the
* final '/'.
*/
if (dest == path) {
/*
* Nothing got copied. The path must have been something
* like '.' or '/' or './' or '/././././/./'.
*/
if (separator)
*dest++ = '/';
else
*dest++ = '.';
}
/* Terminate the result. */
*dest = '\0';
return (ARCHIVE_OK);
}
static int
cleanup_pathname(struct archive_write_disk *a)
{
struct archive_string error_string;
int error_number;
int rc;
archive_string_init(&error_string);
rc = cleanup_pathname_fsobj(a->name, &error_number, &error_string,
a->flags);
if (rc != ARCHIVE_OK) {
archive_set_error(&a->archive, error_number, "%s",
error_string.s);
}
archive_string_free(&error_string);
return rc;
}
/*
* Create the parent directory of the specified path, assuming path
* is already in mutable storage.
*/
static int
create_parent_dir(struct archive_write_disk *a, char *path)
{
char *slash;
int r;
/* Remove tail element to obtain parent name. */
slash = strrchr(path, '/');
if (slash == NULL)
return (ARCHIVE_OK);
*slash = '\0';
r = create_dir(a, path);
*slash = '/';
return (r);
}
/*
* Create the specified dir, recursing to create parents as necessary.
*
* Returns ARCHIVE_OK if the path exists when we're done here.
* Otherwise, returns ARCHIVE_FAILED.
* Assumes path is in mutable storage; path is unchanged on exit.
*/
static int
create_dir(struct archive_write_disk *a, char *path)
{
struct stat st;
struct fixup_entry *le;
char *slash, *base;
mode_t mode_final, mode;
int r;
/* Check for special names and just skip them. */
slash = strrchr(path, '/');
if (slash == NULL)
base = path;
else
base = slash + 1;
if (base[0] == '\0' ||
(base[0] == '.' && base[1] == '\0') ||
(base[0] == '.' && base[1] == '.' && base[2] == '\0')) {
/* Don't bother trying to create null path, '.', or '..'. */
if (slash != NULL) {
*slash = '\0';
r = create_dir(a, path);
*slash = '/';
return (r);
}
return (ARCHIVE_OK);
}
/*
* Yes, this should be stat() and not lstat(). Using lstat()
* here loses the ability to extract through symlinks. Also note
* that this should not use the a->st cache.
*/
if (la_stat(path, &st) == 0) {
if (S_ISDIR(st.st_mode))
return (ARCHIVE_OK);
if ((a->flags & ARCHIVE_EXTRACT_NO_OVERWRITE)) {
archive_set_error(&a->archive, EEXIST,
"Can't create directory '%s'", path);
return (ARCHIVE_FAILED);
}
if (unlink(path) != 0) {
archive_set_error(&a->archive, errno,
"Can't create directory '%s': "
"Conflicting file cannot be removed",
path);
return (ARCHIVE_FAILED);
}
} else if (errno != ENOENT && errno != ENOTDIR) {
/* Stat failed? */
archive_set_error(&a->archive, errno,
"Can't test directory '%s'", path);
return (ARCHIVE_FAILED);
} else if (slash != NULL) {
*slash = '\0';
r = create_dir(a, path);
*slash = '/';
if (r != ARCHIVE_OK)
return (r);
}
/*
* Mode we want for the final restored directory. Per POSIX,
* implicitly-created dirs must be created obeying the umask.
* There's no mention whether this is different for privileged
* restores (which the rest of this code handles by pretending
* umask=0). I've chosen here to always obey the user's umask for
* implicit dirs, even if _EXTRACT_PERM was specified.
*/
mode_final = DEFAULT_DIR_MODE & ~a->user_umask;
/* Mode we want on disk during the restore process. */
mode = mode_final;
mode |= MINIMUM_DIR_MODE;
mode &= MAXIMUM_DIR_MODE;
if (mkdir(path, mode) == 0) {
if (mode != mode_final) {
le = new_fixup(a, path);
if (le == NULL)
return (ARCHIVE_FATAL);
le->fixup |=TODO_MODE_BASE;
le->mode = mode_final;
}
return (ARCHIVE_OK);
}
/*
* Without the following check, a/b/../b/c/d fails at the
* second visit to 'b', so 'd' can't be created. Note that we
* don't add it to the fixup list here, as it's already been
* added.
*/
if (la_stat(path, &st) == 0 && S_ISDIR(st.st_mode))
return (ARCHIVE_OK);
archive_set_error(&a->archive, errno, "Failed to create dir '%s'",
path);
return (ARCHIVE_FAILED);
}
/*
* Note: Although we can skip setting the user id if the desired user
* id matches the current user, we cannot skip setting the group, as
* many systems set the gid based on the containing directory. So
* we have to perform a chown syscall if we want to set the SGID
* bit. (The alternative is to stat() and then possibly chown(); it's
* more efficient to skip the stat() and just always chown().) Note
* that a successful chown() here clears the TODO_SGID_CHECK bit, which
* allows set_mode to skip the stat() check for the GID.
*/
static int
set_ownership(struct archive_write_disk *a)
{
#if !defined(__CYGWIN__) && !defined(__linux__)
/*
* On Linux, a process may have the CAP_CHOWN capability.
* On Windows there is no 'root' user with uid 0.
* Elsewhere we can skip calling chown if we are not root and the desired
* user id does not match the current user.
*/
if (a->user_uid != 0 && a->user_uid != a->uid) {
archive_set_error(&a->archive, errno,
"Can't set UID=%jd", (intmax_t)a->uid);
return (ARCHIVE_WARN);
}
#endif
#ifdef HAVE_FCHOWN
/* If we have an fd, we can avoid a race. */
if (a->fd >= 0 && fchown(a->fd, a->uid, a->gid) == 0) {
/* We've set owner and know uid/gid are correct. */
a->todo &= ~(TODO_OWNER | TODO_SGID_CHECK | TODO_SUID_CHECK);
return (ARCHIVE_OK);
}
#endif
/* We prefer lchown() but will use chown() if that's all we have. */
/* Of course, if we have neither, this will always fail. */
#ifdef HAVE_LCHOWN
if (lchown(a->name, a->uid, a->gid) == 0) {
/* We've set owner and know uid/gid are correct. */
a->todo &= ~(TODO_OWNER | TODO_SGID_CHECK | TODO_SUID_CHECK);
return (ARCHIVE_OK);
}
#elif HAVE_CHOWN
if (!S_ISLNK(a->mode) && chown(a->name, a->uid, a->gid) == 0) {
/* We've set owner and know uid/gid are correct. */
a->todo &= ~(TODO_OWNER | TODO_SGID_CHECK | TODO_SUID_CHECK);
return (ARCHIVE_OK);
}
#endif
archive_set_error(&a->archive, errno,
"Can't set user=%jd/group=%jd for %s",
(intmax_t)a->uid, (intmax_t)a->gid, a->name);
return (ARCHIVE_WARN);
}
/*
* Note: Returns 0 on success, non-zero on failure.
*/
static int
set_time(int fd, int mode, const char *name,
time_t atime, long atime_nsec,
time_t mtime, long mtime_nsec)
{
/* Select the best implementation for this platform. */
#if defined(HAVE_UTIMENSAT) && defined(HAVE_FUTIMENS)
/*
* utimensat() and futimens() are defined in
* POSIX.1-2008. They support ns resolution and setting times
* on fds and symlinks.
*/
struct timespec ts[2];
(void)mode; /* UNUSED */
ts[0].tv_sec = atime;
ts[0].tv_nsec = atime_nsec;
ts[1].tv_sec = mtime;
ts[1].tv_nsec = mtime_nsec;
if (fd >= 0)
return futimens(fd, ts);
return utimensat(AT_FDCWD, name, ts, AT_SYMLINK_NOFOLLOW);
#elif HAVE_UTIMES
/*
* The utimes()-family functions support µs-resolution and
* setting times fds and symlinks. utimes() is documented as
* LEGACY by POSIX, futimes() and lutimes() are not described
* in POSIX.
*/
struct timeval times[2];
times[0].tv_sec = atime;
times[0].tv_usec = atime_nsec / 1000;
times[1].tv_sec = mtime;
times[1].tv_usec = mtime_nsec / 1000;
#ifdef HAVE_FUTIMES
if (fd >= 0)
return (futimes(fd, times));
#else
(void)fd; /* UNUSED */
#endif
#ifdef HAVE_LUTIMES
(void)mode; /* UNUSED */
return (lutimes(name, times));
#else
if (S_ISLNK(mode))
return (0);
return (utimes(name, times));
#endif
#elif defined(HAVE_UTIME)
/*
* utime() is POSIX-standard but only supports 1s resolution and
* does not support fds or symlinks.
*/
struct utimbuf times;
(void)fd; /* UNUSED */
(void)name; /* UNUSED */
(void)atime_nsec; /* UNUSED */
(void)mtime_nsec; /* UNUSED */
times.actime = atime;
times.modtime = mtime;
if (S_ISLNK(mode))
return (ARCHIVE_OK);
return (utime(name, &times));
#else
/*
* We don't know how to set the time on this platform.
*/
(void)fd; /* UNUSED */
(void)mode; /* UNUSED */
(void)name; /* UNUSED */
(void)atime_nsec; /* UNUSED */
(void)mtime_nsec; /* UNUSED */
return (ARCHIVE_WARN);
#endif
}
#ifdef F_SETTIMES
static int
set_time_tru64(int fd, int mode, const char *name,
time_t atime, long atime_nsec,
time_t mtime, long mtime_nsec,
time_t ctime, long ctime_nsec)
{
struct attr_timbuf tstamp;
tstamp.atime.tv_sec = atime;
tstamp.mtime.tv_sec = mtime;
tstamp.ctime.tv_sec = ctime;
#if defined (__hpux) && defined (__ia64)
tstamp.atime.tv_nsec = atime_nsec;
tstamp.mtime.tv_nsec = mtime_nsec;
tstamp.ctime.tv_nsec = ctime_nsec;
#else
tstamp.atime.tv_usec = atime_nsec / 1000;
tstamp.mtime.tv_usec = mtime_nsec / 1000;
tstamp.ctime.tv_usec = ctime_nsec / 1000;
#endif
return (fcntl(fd,F_SETTIMES,&tstamp));
}
#endif /* F_SETTIMES */
static int
set_times(struct archive_write_disk *a,
int fd, int mode, const char *name,
time_t atime, long atime_nanos,
time_t birthtime, long birthtime_nanos,
time_t mtime, long mtime_nanos,
time_t cctime, long ctime_nanos)
{
/* Note: set_time doesn't use libarchive return conventions!
* It uses syscall conventions. So 0 here instead of ARCHIVE_OK. */
int r1 = 0, r2 = 0;
#ifdef F_SETTIMES
/*
* on Tru64 try own fcntl first which can restore even the
* ctime, fall back to default code path below if it fails
* or if we are not running as root
*/
if (a->user_uid == 0 &&
set_time_tru64(fd, mode, name,
atime, atime_nanos, mtime,
mtime_nanos, cctime, ctime_nanos) == 0) {
return (ARCHIVE_OK);
}
#else /* Tru64 */
(void)cctime; /* UNUSED */
(void)ctime_nanos; /* UNUSED */
#endif /* Tru64 */
#ifdef HAVE_STRUCT_STAT_ST_BIRTHTIME
/*
* If you have struct stat.st_birthtime, we assume BSD
* birthtime semantics, in which {f,l,}utimes() updates
* birthtime to earliest mtime. So we set the time twice,
* first using the birthtime, then using the mtime. If
* birthtime == mtime, this isn't necessary, so we skip it.
* If birthtime > mtime, then this won't work, so we skip it.
*/
if (birthtime < mtime
|| (birthtime == mtime && birthtime_nanos < mtime_nanos))
r1 = set_time(fd, mode, name,
atime, atime_nanos,
birthtime, birthtime_nanos);
#else
(void)birthtime; /* UNUSED */
(void)birthtime_nanos; /* UNUSED */
#endif
r2 = set_time(fd, mode, name,
atime, atime_nanos,
mtime, mtime_nanos);
if (r1 != 0 || r2 != 0) {
archive_set_error(&a->archive, errno,
"Can't restore time");
return (ARCHIVE_WARN);
}
return (ARCHIVE_OK);
}
static int
set_times_from_entry(struct archive_write_disk *a)
{
time_t atime, birthtime, mtime, cctime;
long atime_nsec, birthtime_nsec, mtime_nsec, ctime_nsec;
/* Suitable defaults. */
atime = birthtime = mtime = cctime = a->start_time;
atime_nsec = birthtime_nsec = mtime_nsec = ctime_nsec = 0;
/* If no time was provided, we're done. */
if (!archive_entry_atime_is_set(a->entry)
#if HAVE_STRUCT_STAT_ST_BIRTHTIME
&& !archive_entry_birthtime_is_set(a->entry)
#endif
&& !archive_entry_mtime_is_set(a->entry))
return (ARCHIVE_OK);
if (archive_entry_atime_is_set(a->entry)) {
atime = archive_entry_atime(a->entry);
atime_nsec = archive_entry_atime_nsec(a->entry);
}
if (archive_entry_birthtime_is_set(a->entry)) {
birthtime = archive_entry_birthtime(a->entry);
birthtime_nsec = archive_entry_birthtime_nsec(a->entry);
}
if (archive_entry_mtime_is_set(a->entry)) {
mtime = archive_entry_mtime(a->entry);
mtime_nsec = archive_entry_mtime_nsec(a->entry);
}
if (archive_entry_ctime_is_set(a->entry)) {
cctime = archive_entry_ctime(a->entry);
ctime_nsec = archive_entry_ctime_nsec(a->entry);
}
return set_times(a, a->fd, a->mode, a->name,
atime, atime_nsec,
birthtime, birthtime_nsec,
mtime, mtime_nsec,
cctime, ctime_nsec);
}
static int
set_mode(struct archive_write_disk *a, int mode)
{
int r = ARCHIVE_OK;
int r2;
mode &= 07777; /* Strip off file type bits. */
if (a->todo & TODO_SGID_CHECK) {
/*
* If we don't know the GID is right, we must stat()
* to verify it. We can't just check the GID of this
* process, since systems sometimes set GID from
* the enclosing dir or based on ACLs.
*/
if ((r = lazy_stat(a)) != ARCHIVE_OK)
return (r);
if (a->pst->st_gid != a->gid) {
mode &= ~ S_ISGID;
if (a->flags & ARCHIVE_EXTRACT_OWNER) {
/*
* This is only an error if you
* requested owner restore. If you
* didn't, we'll try to restore
* sgid/suid, but won't consider it a
* problem if we can't.
*/
archive_set_error(&a->archive, -1,
"Can't restore SGID bit");
r = ARCHIVE_WARN;
}
}
/* While we're here, double-check the UID. */
if (a->pst->st_uid != a->uid
&& (a->todo & TODO_SUID)) {
mode &= ~ S_ISUID;
if (a->flags & ARCHIVE_EXTRACT_OWNER) {
archive_set_error(&a->archive, -1,
"Can't restore SUID bit");
r = ARCHIVE_WARN;
}
}
a->todo &= ~TODO_SGID_CHECK;
a->todo &= ~TODO_SUID_CHECK;
} else if (a->todo & TODO_SUID_CHECK) {
/*
* If we don't know the UID is right, we can just check
* the user, since all systems set the file UID from
* the process UID.
*/
if (a->user_uid != a->uid) {
mode &= ~ S_ISUID;
if (a->flags & ARCHIVE_EXTRACT_OWNER) {
archive_set_error(&a->archive, -1,
"Can't make file SUID");
r = ARCHIVE_WARN;
}
}
a->todo &= ~TODO_SUID_CHECK;
}
if (S_ISLNK(a->mode)) {
#ifdef HAVE_LCHMOD
/*
* If this is a symlink, use lchmod(). If the
* platform doesn't support lchmod(), just skip it. A
* platform that doesn't provide a way to set
* permissions on symlinks probably ignores
* permissions on symlinks, so a failure here has no
* impact.
*/
if (lchmod(a->name, mode) != 0) {
switch (errno) {
case ENOTSUP:
case ENOSYS:
#if ENOTSUP != EOPNOTSUPP
case EOPNOTSUPP:
#endif
/*
* if lchmod is defined but the platform
* doesn't support it, silently ignore
* error
*/
break;
default:
archive_set_error(&a->archive, errno,
"Can't set permissions to 0%o", (int)mode);
r = ARCHIVE_WARN;
}
}
#endif
} else if (!S_ISDIR(a->mode)) {
/*
* If it's not a symlink and not a dir, then use
* fchmod() or chmod(), depending on whether we have
* an fd. Dirs get their perms set during the
* post-extract fixup, which is handled elsewhere.
*/
#ifdef HAVE_FCHMOD
if (a->fd >= 0)
r2 = fchmod(a->fd, mode);
else
#endif
/* If this platform lacks fchmod(), then
* we'll just use chmod(). */
r2 = chmod(a->name, mode);
if (r2 != 0) {
archive_set_error(&a->archive, errno,
"Can't set permissions to 0%o", (int)mode);
r = ARCHIVE_WARN;
}
}
return (r);
}
static int
set_fflags(struct archive_write_disk *a)
{
struct fixup_entry *le;
unsigned long set, clear;
int r;
mode_t mode = archive_entry_mode(a->entry);
/*
* Make 'critical_flags' hold all file flags that can't be
* immediately restored. For example, on BSD systems,
* SF_IMMUTABLE prevents hardlinks from being created, so
* should not be set until after any hardlinks are created. To
* preserve some semblance of portability, this uses #ifdef
* extensively. Ugly, but it works.
*
* Yes, Virginia, this does create a security race. It's mitigated
* somewhat by the practice of creating dirs 0700 until the extract
* is done, but it would be nice if we could do more than that.
* People restoring critical file systems should be wary of
* other programs that might try to muck with files as they're
* being restored.
*/
const int critical_flags = 0
#ifdef SF_IMMUTABLE
| SF_IMMUTABLE
#endif
#ifdef UF_IMMUTABLE
| UF_IMMUTABLE
#endif
#ifdef SF_APPEND
| SF_APPEND
#endif
#ifdef UF_APPEND
| UF_APPEND
#endif
#if defined(FS_APPEND_FL)
| FS_APPEND_FL
#elif defined(EXT2_APPEND_FL)
| EXT2_APPEND_FL
#endif
#if defined(FS_IMMUTABLE_FL)
| FS_IMMUTABLE_FL
#elif defined(EXT2_IMMUTABLE_FL)
| EXT2_IMMUTABLE_FL
#endif
#ifdef FS_JOURNAL_DATA_FL
| FS_JOURNAL_DATA_FL
#endif
;
if (a->todo & TODO_FFLAGS) {
archive_entry_fflags(a->entry, &set, &clear);
/*
* The first test encourages the compiler to eliminate
* all of this if it's not necessary.
*/
if ((critical_flags != 0) && (set & critical_flags)) {
le = current_fixup(a, a->name);
if (le == NULL)
return (ARCHIVE_FATAL);
le->filetype = archive_entry_filetype(a->entry);
le->fixup |= TODO_FFLAGS;
le->fflags_set = set;
/* Store the mode if it's not already there. */
if ((le->fixup & TODO_MODE) == 0)
le->mode = mode;
} else {
r = set_fflags_platform(a, a->fd,
a->name, mode, set, clear);
if (r != ARCHIVE_OK)
return (r);
}
}
return (ARCHIVE_OK);
}
static int
clear_nochange_fflags(struct archive_write_disk *a)
{
mode_t mode = archive_entry_mode(a->entry);
const int nochange_flags = 0
#ifdef SF_IMMUTABLE
| SF_IMMUTABLE
#endif
#ifdef UF_IMMUTABLE
| UF_IMMUTABLE
#endif
#ifdef SF_APPEND
| SF_APPEND
#endif
#ifdef UF_APPEND
| UF_APPEND
#endif
#ifdef EXT2_APPEND_FL
| EXT2_APPEND_FL
#endif
#ifdef EXT2_IMMUTABLE_FL
| EXT2_IMMUTABLE_FL
#endif
;
return (set_fflags_platform(a, a->fd, a->name, mode, 0,
nochange_flags));
}
#if ( defined(HAVE_LCHFLAGS) || defined(HAVE_CHFLAGS) || defined(HAVE_FCHFLAGS) ) && defined(HAVE_STRUCT_STAT_ST_FLAGS)
/*
* BSD reads flags using stat() and sets them with one of {f,l,}chflags()
*/
static int
set_fflags_platform(struct archive_write_disk *a, int fd, const char *name,
mode_t mode, unsigned long set, unsigned long clear)
{
int r;
const int sf_mask = 0
#ifdef SF_APPEND
| SF_APPEND
#endif
#ifdef SF_ARCHIVED
| SF_ARCHIVED
#endif
#ifdef SF_IMMUTABLE
| SF_IMMUTABLE
#endif
#ifdef SF_NOUNLINK
| SF_NOUNLINK
#endif
;
(void)mode; /* UNUSED */
if (set == 0 && clear == 0)
return (ARCHIVE_OK);
/*
* XXX Is the stat here really necessary? Or can I just use
* the 'set' flags directly? In particular, I'm not sure
* about the correct approach if we're overwriting an existing
* file that already has flags on it. XXX
*/
if ((r = lazy_stat(a)) != ARCHIVE_OK)
return (r);
a->st.st_flags &= ~clear;
a->st.st_flags |= set;
/* Only super-user may change SF_* flags */
if (a->user_uid != 0)
a->st.st_flags &= ~sf_mask;
#ifdef HAVE_FCHFLAGS
/* If platform has fchflags() and we were given an fd, use it. */
if (fd >= 0 && fchflags(fd, a->st.st_flags) == 0)
return (ARCHIVE_OK);
#endif
/*
* If we can't use the fd to set the flags, we'll use the
* pathname to set flags. We prefer lchflags() but will use
* chflags() if we must.
*/
#ifdef HAVE_LCHFLAGS
if (lchflags(name, a->st.st_flags) == 0)
return (ARCHIVE_OK);
#elif defined(HAVE_CHFLAGS)
if (S_ISLNK(a->st.st_mode)) {
archive_set_error(&a->archive, errno,
"Can't set file flags on symlink.");
return (ARCHIVE_WARN);
}
if (chflags(name, a->st.st_flags) == 0)
return (ARCHIVE_OK);
#endif
archive_set_error(&a->archive, errno,
"Failed to set file flags");
return (ARCHIVE_WARN);
}
#elif (defined(FS_IOC_GETFLAGS) && defined(FS_IOC_SETFLAGS) && \
defined(HAVE_WORKING_FS_IOC_GETFLAGS)) || \
(defined(EXT2_IOC_GETFLAGS) && defined(EXT2_IOC_SETFLAGS) && \
defined(HAVE_WORKING_EXT2_IOC_GETFLAGS))
/*
* Linux uses ioctl() to read and write file flags.
*/
static int
set_fflags_platform(struct archive_write_disk *a, int fd, const char *name,
mode_t mode, unsigned long set, unsigned long clear)
{
int ret;
int myfd = fd;
int newflags, oldflags;
/*
* Linux has no define for the flags that are only settable by
* the root user. This code may seem a little complex, but
* there seem to be some Linux systems that lack these
* defines. (?) The code below degrades reasonably gracefully
* if sf_mask is incomplete.
*/
const int sf_mask = 0
#if defined(FS_IMMUTABLE_FL)
| FS_IMMUTABLE_FL
#elif defined(EXT2_IMMUTABLE_FL)
| EXT2_IMMUTABLE_FL
#endif
#if defined(FS_APPEND_FL)
| FS_APPEND_FL
#elif defined(EXT2_APPEND_FL)
| EXT2_APPEND_FL
#endif
#if defined(FS_JOURNAL_DATA_FL)
| FS_JOURNAL_DATA_FL
#endif
;
if (set == 0 && clear == 0)
return (ARCHIVE_OK);
/* Only regular files and dirs can have flags. */
if (!S_ISREG(mode) && !S_ISDIR(mode))
return (ARCHIVE_OK);
/* If we weren't given an fd, open it ourselves. */
if (myfd < 0) {
myfd = open(name, O_RDONLY | O_NONBLOCK | O_BINARY |
O_CLOEXEC | O_NOFOLLOW);
__archive_ensure_cloexec_flag(myfd);
}
if (myfd < 0)
return (ARCHIVE_OK);
/*
* XXX As above, this would be way simpler if we didn't have
* to read the current flags from disk. XXX
*/
ret = ARCHIVE_OK;
/* Read the current file flags. */
if (ioctl(myfd,
#ifdef FS_IOC_GETFLAGS
FS_IOC_GETFLAGS,
#else
EXT2_IOC_GETFLAGS,
#endif
&oldflags) < 0)
goto fail;
/* Try setting the flags as given. */
newflags = (oldflags & ~clear) | set;
if (ioctl(myfd,
#ifdef FS_IOC_SETFLAGS
FS_IOC_SETFLAGS,
#else
EXT2_IOC_SETFLAGS,
#endif
&newflags) >= 0)
goto cleanup;
if (errno != EPERM)
goto fail;
/* If we couldn't set all the flags, try again with a subset. */
newflags &= ~sf_mask;
oldflags &= sf_mask;
newflags |= oldflags;
if (ioctl(myfd,
#ifdef FS_IOC_SETFLAGS
FS_IOC_SETFLAGS,
#else
EXT2_IOC_SETFLAGS,
#endif
&newflags) >= 0)
goto cleanup;
/* We couldn't set the flags, so report the failure. */
fail:
archive_set_error(&a->archive, errno,
"Failed to set file flags");
ret = ARCHIVE_WARN;
cleanup:
if (fd < 0)
close(myfd);
return (ret);
}
#else
/*
* Of course, some systems have neither BSD chflags() nor Linux' flags
* support through ioctl().
*/
static int
set_fflags_platform(struct archive_write_disk *a, int fd, const char *name,
mode_t mode, unsigned long set, unsigned long clear)
{
(void)a; /* UNUSED */
(void)fd; /* UNUSED */
(void)name; /* UNUSED */
(void)mode; /* UNUSED */
(void)set; /* UNUSED */
(void)clear; /* UNUSED */
return (ARCHIVE_OK);
}
#endif /* __linux */
#ifndef HAVE_COPYFILE_H
/* Default is to simply drop Mac extended metadata. */
static int
set_mac_metadata(struct archive_write_disk *a, const char *pathname,
const void *metadata, size_t metadata_size)
{
(void)a; /* UNUSED */
(void)pathname; /* UNUSED */
(void)metadata; /* UNUSED */
(void)metadata_size; /* UNUSED */
return (ARCHIVE_OK);
}
static int
fixup_appledouble(struct archive_write_disk *a, const char *pathname)
{
(void)a; /* UNUSED */
(void)pathname; /* UNUSED */
return (ARCHIVE_OK);
}
#else
/*
* On Mac OS, we use copyfile() to unpack the metadata and
* apply it to the target file.
*/
#if defined(HAVE_SYS_XATTR_H)
static int
copy_xattrs(struct archive_write_disk *a, int tmpfd, int dffd)
{
ssize_t xattr_size;
char *xattr_names = NULL, *xattr_val = NULL;
int ret = ARCHIVE_OK, xattr_i;
xattr_size = flistxattr(tmpfd, NULL, 0, 0);
if (xattr_size == -1) {
archive_set_error(&a->archive, errno,
"Failed to read metadata(xattr)");
ret = ARCHIVE_WARN;
goto exit_xattr;
}
xattr_names = malloc(xattr_size);
if (xattr_names == NULL) {
archive_set_error(&a->archive, ENOMEM,
"Can't allocate memory for metadata(xattr)");
ret = ARCHIVE_FATAL;
goto exit_xattr;
}
xattr_size = flistxattr(tmpfd, xattr_names, xattr_size, 0);
if (xattr_size == -1) {
archive_set_error(&a->archive, errno,
"Failed to read metadata(xattr)");
ret = ARCHIVE_WARN;
goto exit_xattr;
}
for (xattr_i = 0; xattr_i < xattr_size;
xattr_i += strlen(xattr_names + xattr_i) + 1) {
char *xattr_val_saved;
ssize_t s;
int f;
s = fgetxattr(tmpfd, xattr_names + xattr_i, NULL, 0, 0, 0);
if (s == -1) {
archive_set_error(&a->archive, errno,
"Failed to get metadata(xattr)");
ret = ARCHIVE_WARN;
goto exit_xattr;
}
xattr_val_saved = xattr_val;
xattr_val = realloc(xattr_val, s);
if (xattr_val == NULL) {
archive_set_error(&a->archive, ENOMEM,
"Failed to get metadata(xattr)");
ret = ARCHIVE_WARN;
free(xattr_val_saved);
goto exit_xattr;
}
s = fgetxattr(tmpfd, xattr_names + xattr_i, xattr_val, s, 0, 0);
if (s == -1) {
archive_set_error(&a->archive, errno,
"Failed to get metadata(xattr)");
ret = ARCHIVE_WARN;
goto exit_xattr;
}
f = fsetxattr(dffd, xattr_names + xattr_i, xattr_val, s, 0, 0);
if (f == -1) {
archive_set_error(&a->archive, errno,
"Failed to get metadata(xattr)");
ret = ARCHIVE_WARN;
goto exit_xattr;
}
}
exit_xattr:
free(xattr_names);
free(xattr_val);
return (ret);
}
#endif
static int
copy_acls(struct archive_write_disk *a, int tmpfd, int dffd)
{
#ifndef HAVE_SYS_ACL_H
return 0;
#else
acl_t acl, dfacl = NULL;
int acl_r, ret = ARCHIVE_OK;
acl = acl_get_fd(tmpfd);
if (acl == NULL) {
if (errno == ENOENT)
/* There are not any ACLs. */
return (ret);
archive_set_error(&a->archive, errno,
"Failed to get metadata(acl)");
ret = ARCHIVE_WARN;
goto exit_acl;
}
dfacl = acl_dup(acl);
acl_r = acl_set_fd(dffd, dfacl);
if (acl_r == -1) {
archive_set_error(&a->archive, errno,
"Failed to get metadata(acl)");
ret = ARCHIVE_WARN;
goto exit_acl;
}
exit_acl:
if (acl)
acl_free(acl);
if (dfacl)
acl_free(dfacl);
return (ret);
#endif
}
static int
create_tempdatafork(struct archive_write_disk *a, const char *pathname)
{
struct archive_string tmpdatafork;
int tmpfd;
archive_string_init(&tmpdatafork);
archive_strcpy(&tmpdatafork, "tar.md.XXXXXX");
tmpfd = mkstemp(tmpdatafork.s);
if (tmpfd < 0) {
archive_set_error(&a->archive, errno,
"Failed to mkstemp");
archive_string_free(&tmpdatafork);
return (-1);
}
if (copyfile(pathname, tmpdatafork.s, 0,
COPYFILE_UNPACK | COPYFILE_NOFOLLOW
| COPYFILE_ACL | COPYFILE_XATTR) < 0) {
archive_set_error(&a->archive, errno,
"Failed to restore metadata");
close(tmpfd);
tmpfd = -1;
}
unlink(tmpdatafork.s);
archive_string_free(&tmpdatafork);
return (tmpfd);
}
static int
copy_metadata(struct archive_write_disk *a, const char *metadata,
const char *datafork, int datafork_compressed)
{
int ret = ARCHIVE_OK;
if (datafork_compressed) {
int dffd, tmpfd;
tmpfd = create_tempdatafork(a, metadata);
if (tmpfd == -1)
return (ARCHIVE_WARN);
/*
* Do not open the data fork compressed by HFS+ compression
* with at least a writing mode(O_RDWR or O_WRONLY). it
* makes the data fork uncompressed.
*/
dffd = open(datafork, 0);
if (dffd == -1) {
archive_set_error(&a->archive, errno,
"Failed to open the data fork for metadata");
close(tmpfd);
return (ARCHIVE_WARN);
}
#if defined(HAVE_SYS_XATTR_H)
ret = copy_xattrs(a, tmpfd, dffd);
if (ret == ARCHIVE_OK)
#endif
ret = copy_acls(a, tmpfd, dffd);
close(tmpfd);
close(dffd);
} else {
if (copyfile(metadata, datafork, 0,
COPYFILE_UNPACK | COPYFILE_NOFOLLOW
| COPYFILE_ACL | COPYFILE_XATTR) < 0) {
archive_set_error(&a->archive, errno,
"Failed to restore metadata");
ret = ARCHIVE_WARN;
}
}
return (ret);
}
static int
set_mac_metadata(struct archive_write_disk *a, const char *pathname,
const void *metadata, size_t metadata_size)
{
struct archive_string tmp;
ssize_t written;
int fd;
int ret = ARCHIVE_OK;
/* This would be simpler if copyfile() could just accept the
* metadata as a block of memory; then we could sidestep this
* silly dance of writing the data to disk just so that
* copyfile() can read it back in again. */
archive_string_init(&tmp);
archive_strcpy(&tmp, pathname);
archive_strcat(&tmp, ".XXXXXX");
fd = mkstemp(tmp.s);
if (fd < 0) {
archive_set_error(&a->archive, errno,
"Failed to restore metadata");
archive_string_free(&tmp);
return (ARCHIVE_WARN);
}
written = write(fd, metadata, metadata_size);
close(fd);
if ((size_t)written != metadata_size) {
archive_set_error(&a->archive, errno,
"Failed to restore metadata");
ret = ARCHIVE_WARN;
} else {
int compressed;
#if defined(UF_COMPRESSED)
if ((a->todo & TODO_HFS_COMPRESSION) != 0 &&
(ret = lazy_stat(a)) == ARCHIVE_OK)
compressed = a->st.st_flags & UF_COMPRESSED;
else
#endif
compressed = 0;
ret = copy_metadata(a, tmp.s, pathname, compressed);
}
unlink(tmp.s);
archive_string_free(&tmp);
return (ret);
}
static int
fixup_appledouble(struct archive_write_disk *a, const char *pathname)
{
char buff[8];
struct stat st;
const char *p;
struct archive_string datafork;
int fd = -1, ret = ARCHIVE_OK;
archive_string_init(&datafork);
/* Check if the current file name is a type of the resource
* fork file. */
p = strrchr(pathname, '/');
if (p == NULL)
p = pathname;
else
p++;
if (p[0] != '.' || p[1] != '_')
goto skip_appledouble;
/*
* Check if the data fork file exists.
*
* TODO: Check if this write disk object has handled it.
*/
archive_strncpy(&datafork, pathname, p - pathname);
archive_strcat(&datafork, p + 2);
if (lstat(datafork.s, &st) == -1 ||
(st.st_mode & AE_IFMT) != AE_IFREG)
goto skip_appledouble;
/*
* Check if the file is in the AppleDouble form.
*/
fd = open(pathname, O_RDONLY | O_BINARY | O_CLOEXEC);
__archive_ensure_cloexec_flag(fd);
if (fd == -1) {
archive_set_error(&a->archive, errno,
"Failed to open a restoring file");
ret = ARCHIVE_WARN;
goto skip_appledouble;
}
if (read(fd, buff, 8) == -1) {
archive_set_error(&a->archive, errno,
"Failed to read a restoring file");
close(fd);
ret = ARCHIVE_WARN;
goto skip_appledouble;
}
close(fd);
/* Check AppleDouble Magic Code. */
if (archive_be32dec(buff) != 0x00051607)
goto skip_appledouble;
/* Check AppleDouble Version. */
if (archive_be32dec(buff+4) != 0x00020000)
goto skip_appledouble;
ret = copy_metadata(a, pathname, datafork.s,
#if defined(UF_COMPRESSED)
st.st_flags & UF_COMPRESSED);
#else
0);
#endif
if (ret == ARCHIVE_OK) {
unlink(pathname);
ret = ARCHIVE_EOF;
}
skip_appledouble:
archive_string_free(&datafork);
return (ret);
}
#endif
#if ARCHIVE_XATTR_LINUX || ARCHIVE_XATTR_DARWIN || ARCHIVE_XATTR_AIX
/*
* Restore extended attributes - Linux, Darwin and AIX implementations:
* AIX' ea interface is syntaxwise identical to the Linux xattr interface.
*/
static int
set_xattrs(struct archive_write_disk *a)
{
struct archive_entry *entry = a->entry;
struct archive_string errlist;
int ret = ARCHIVE_OK;
int i = archive_entry_xattr_reset(entry);
short fail = 0;
archive_string_init(&errlist);
while (i--) {
const char *name;
const void *value;
size_t size;
int e;
archive_entry_xattr_next(entry, &name, &value, &size);
if (name == NULL)
continue;
#if ARCHIVE_XATTR_LINUX
/* Linux: quietly skip POSIX.1e ACL extended attributes */
if (strncmp(name, "system.", 7) == 0 &&
(strcmp(name + 7, "posix_acl_access") == 0 ||
strcmp(name + 7, "posix_acl_default") == 0))
continue;
if (strncmp(name, "trusted.SGI_", 12) == 0 &&
(strcmp(name + 12, "ACL_DEFAULT") == 0 ||
strcmp(name + 12, "ACL_FILE") == 0))
continue;
/* Linux: xfsroot namespace is obsolete and unsupported */
if (strncmp(name, "xfsroot.", 8) == 0) {
fail = 1;
archive_strcat(&errlist, name);
archive_strappend_char(&errlist, ' ');
continue;
}
#endif
if (a->fd >= 0) {
#if ARCHIVE_XATTR_LINUX
e = fsetxattr(a->fd, name, value, size, 0);
#elif ARCHIVE_XATTR_DARWIN
e = fsetxattr(a->fd, name, value, size, 0, 0);
#elif ARCHIVE_XATTR_AIX
e = fsetea(a->fd, name, value, size, 0);
#endif
} else {
#if ARCHIVE_XATTR_LINUX
e = lsetxattr(archive_entry_pathname(entry),
name, value, size, 0);
#elif ARCHIVE_XATTR_DARWIN
e = setxattr(archive_entry_pathname(entry),
name, value, size, 0, XATTR_NOFOLLOW);
#elif ARCHIVE_XATTR_AIX
e = lsetea(archive_entry_pathname(entry),
name, value, size, 0);
#endif
}
if (e == -1) {
ret = ARCHIVE_WARN;
archive_strcat(&errlist, name);
archive_strappend_char(&errlist, ' ');
if (errno != ENOTSUP && errno != ENOSYS)
fail = 1;
}
}
if (ret == ARCHIVE_WARN) {
if (fail && errlist.length > 0) {
errlist.length--;
errlist.s[errlist.length] = '\0';
archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
"Cannot restore extended attributes: %s",
errlist.s);
} else
archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
"Cannot restore extended "
"attributes on this file system.");
}
archive_string_free(&errlist);
return (ret);
}
#elif ARCHIVE_XATTR_FREEBSD
/*
* Restore extended attributes - FreeBSD implementation
*/
static int
set_xattrs(struct archive_write_disk *a)
{
struct archive_entry *entry = a->entry;
struct archive_string errlist;
int ret = ARCHIVE_OK;
int i = archive_entry_xattr_reset(entry);
short fail = 0;
archive_string_init(&errlist);
while (i--) {
const char *name;
const void *value;
size_t size;
archive_entry_xattr_next(entry, &name, &value, &size);
if (name != NULL) {
int e;
int namespace;
namespace = EXTATTR_NAMESPACE_USER;
if (strncmp(name, "user.", 5) == 0) {
/* "user." attributes go to user namespace */
name += 5;
namespace = EXTATTR_NAMESPACE_USER;
} else if (strncmp(name, "system.", 7) == 0) {
name += 7;
namespace = EXTATTR_NAMESPACE_SYSTEM;
if (!strcmp(name, "nfs4.acl") ||
!strcmp(name, "posix1e.acl_access") ||
!strcmp(name, "posix1e.acl_default"))
continue;
} else {
/* Other namespaces are unsupported */
archive_strcat(&errlist, name);
archive_strappend_char(&errlist, ' ');
fail = 1;
ret = ARCHIVE_WARN;
continue;
}
if (a->fd >= 0) {
/*
* On FreeBSD, extattr_set_fd does not
* return the same as
* extattr_set_file. It returns zero
* on success, non-zero on failure.
*
* We can detect the failure by
* manually setting errno prior to the
* call and checking after.
*
* If errno remains zero, fake the
* return value by setting e to size.
*
* This is a hack for now until I
* (Shawn Webb) get FreeBSD to fix the
* issue, if that's even possible.
*/
errno = 0;
e = extattr_set_fd(a->fd, namespace, name,
value, size);
if (e == 0 && errno == 0) {
e = size;
}
} else {
e = extattr_set_link(
archive_entry_pathname(entry), namespace,
name, value, size);
}
if (e != (int)size) {
archive_strcat(&errlist, name);
archive_strappend_char(&errlist, ' ');
ret = ARCHIVE_WARN;
if (errno != ENOTSUP && errno != ENOSYS)
fail = 1;
}
}
}
if (ret == ARCHIVE_WARN) {
if (fail && errlist.length > 0) {
errlist.length--;
errlist.s[errlist.length] = '\0';
archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
"Cannot restore extended attributes: %s",
errlist.s);
} else
archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
"Cannot restore extended "
"attributes on this file system.");
}
archive_string_free(&errlist);
return (ret);
}
#else
/*
* Restore extended attributes - stub implementation for unsupported systems
*/
static int
set_xattrs(struct archive_write_disk *a)
{
static int warning_done = 0;
/* If there aren't any extended attributes, then it's okay not
* to extract them, otherwise, issue a single warning. */
if (archive_entry_xattr_count(a->entry) != 0 && !warning_done) {
warning_done = 1;
archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
"Cannot restore extended attributes on this system");
return (ARCHIVE_WARN);
}
/* Warning was already emitted; suppress further warnings. */
return (ARCHIVE_OK);
}
#endif
/*
* Test if file on disk is older than entry.
*/
static int
older(struct stat *st, struct archive_entry *entry)
{
/* First, test the seconds and return if we have a definite answer. */
/* Definitely older. */
if (to_int64_time(st->st_mtime) < to_int64_time(archive_entry_mtime(entry)))
return (1);
/* Definitely younger. */
if (to_int64_time(st->st_mtime) > to_int64_time(archive_entry_mtime(entry)))
return (0);
/* If this platform supports fractional seconds, try those. */
#if HAVE_STRUCT_STAT_ST_MTIMESPEC_TV_NSEC
/* Definitely older. */
if (st->st_mtimespec.tv_nsec < archive_entry_mtime_nsec(entry))
return (1);
#elif HAVE_STRUCT_STAT_ST_MTIM_TV_NSEC
/* Definitely older. */
if (st->st_mtim.tv_nsec < archive_entry_mtime_nsec(entry))
return (1);
#elif HAVE_STRUCT_STAT_ST_MTIME_N
/* older. */
if (st->st_mtime_n < archive_entry_mtime_nsec(entry))
return (1);
#elif HAVE_STRUCT_STAT_ST_UMTIME
/* older. */
if (st->st_umtime * 1000 < archive_entry_mtime_nsec(entry))
return (1);
#elif HAVE_STRUCT_STAT_ST_MTIME_USEC
/* older. */
if (st->st_mtime_usec * 1000 < archive_entry_mtime_nsec(entry))
return (1);
#else
/* This system doesn't have high-res timestamps. */
#endif
/* Same age or newer, so not older. */
return (0);
}
#ifndef ARCHIVE_ACL_SUPPORT
int
archive_write_disk_set_acls(struct archive *a, int fd, const char *name,
struct archive_acl *abstract_acl, __LA_MODE_T mode)
{
(void)a; /* UNUSED */
(void)fd; /* UNUSED */
(void)name; /* UNUSED */
(void)abstract_acl; /* UNUSED */
(void)mode; /* UNUSED */
return (ARCHIVE_OK);
}
#endif
#endif /* !_WIN32 || __CYGWIN__ */
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