kolan
/
CMake
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity
CMake/Utilities/cmlibarchive/libarchive/archive_read_disk_posix.c

2310 lines
61 KiB
C
Raw Blame History

/*-
* Copyright (c) 2003-2009 Tim Kientzle
* Copyright (c) 2010,2011 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.
*/
/* This is the tree-walking code for POSIX systems. */
#if !defined(_WIN32) || defined(__CYGWIN__)
#include "archive_platform.h"
__FBSDID("$FreeBSD$");
#ifdef HAVE_SYS_PARAM_H
#include <sys/param.h>
#endif
#ifdef HAVE_SYS_MOUNT_H
#include <sys/mount.h>
#endif
#ifdef HAVE_SYS_STAT_H
#include <sys/stat.h>
#endif
#ifdef HAVE_SYS_STATFS_H
#include <sys/statfs.h>
#endif
#ifdef HAVE_SYS_STATVFS_H
#include <sys/statvfs.h>
#endif
#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#endif
#ifdef HAVE_LINUX_MAGIC_H
#include <linux/magic.h>
#endif
#ifdef HAVE_DIRECT_H
#include <direct.h>
#endif
#ifdef HAVE_DIRENT_H
#include <dirent.h>
#endif
#ifdef HAVE_ERRNO_H
#include <errno.h>
#endif
#ifdef HAVE_FCNTL_H
#include <fcntl.h>
#endif
#ifdef HAVE_LIMITS_H
#include <limits.h>
#endif
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include "archive.h"
#include "archive_string.h"
#include "archive_entry.h"
#include "archive_private.h"
#include "archive_read_disk_private.h"
#ifndef HAVE_FCHDIR
#error fchdir function required.
#endif
#ifndef O_BINARY
#define O_BINARY 0
#endif
/*-
* This is a new directory-walking system that addresses a number
* of problems I've had with fts(3). In particular, it has no
* pathname-length limits (other than the size of 'int'), handles
* deep logical traversals, uses considerably less memory, and has
* an opaque interface (easier to modify in the future).
*
* Internally, it keeps a single list of "tree_entry" items that
* represent filesystem objects that require further attention.
* Non-directories are not kept in memory: they are pulled from
* readdir(), returned to the client, then freed as soon as possible.
* Any directory entry to be traversed gets pushed onto the stack.
*
* There is surprisingly little information that needs to be kept for
* each item on the stack. Just the name, depth (represented here as the
* string length of the parent directory's pathname), and some markers
* indicating how to get back to the parent (via chdir("..") for a
* regular dir or via fchdir(2) for a symlink).
*/
/*
* TODO:
* 1) Loop checking.
* 3) Arbitrary logical traversals by closing/reopening intermediate fds.
*/
struct restore_time {
const char *name;
time_t mtime;
long mtime_nsec;
time_t atime;
long atime_nsec;
mode_t filetype;
int noatime;
};
struct tree_entry {
int depth;
struct tree_entry *next;
struct tree_entry *parent;
struct archive_string name;
size_t dirname_length;
int64_t dev;
int64_t ino;
int flags;
int filesystem_id;
/* How to return back to the parent of a symlink. */
int symlink_parent_fd;
/* How to restore time of a directory. */
struct restore_time restore_time;
};
struct filesystem {
int64_t dev;
int synthetic;
int remote;
int noatime;
#if defined(HAVE_READDIR_R)
size_t name_max;
#endif
long incr_xfer_size;
long max_xfer_size;
long min_xfer_size;
long xfer_align;
/*
* Buffer used for reading file contents.
*/
/* Exactly allocated memory pointer. */
unsigned char *allocation_ptr;
/* Pointer adjusted to the filesystem alignment . */
unsigned char *buff;
size_t buff_size;
};
/* Definitions for tree_entry.flags bitmap. */
#define isDir 1 /* This entry is a regular directory. */
#define isDirLink 2 /* This entry is a symbolic link to a directory. */
#define needsFirstVisit 4 /* This is an initial entry. */
#define needsDescent 8 /* This entry needs to be previsited. */
#define needsOpen 16 /* This is a directory that needs to be opened. */
#define needsAscent 32 /* This entry needs to be postvisited. */
/*
* Local data for this package.
*/
struct tree {
struct tree_entry *stack;
struct tree_entry *current;
DIR *d;
#define INVALID_DIR_HANDLE NULL
struct dirent *de;
#if defined(HAVE_READDIR_R)
struct dirent *dirent;
size_t dirent_allocated;
#endif
int flags;
int visit_type;
/* Error code from last failed operation. */
int tree_errno;
/* Dynamically-sized buffer for holding path */
struct archive_string path;
/* Last path element */
const char *basename;
/* Leading dir length */
size_t dirname_length;
int depth;
int openCount;
int maxOpenCount;
int initial_dir_fd;
int working_dir_fd;
struct stat lst;
struct stat st;
int descend;
int nlink;
/* How to restore time of a file. */
struct restore_time restore_time;
struct entry_sparse {
int64_t length;
int64_t offset;
} *sparse_list, *current_sparse;
int sparse_count;
int sparse_list_size;
char initial_symlink_mode;
char symlink_mode;
struct filesystem *current_filesystem;
struct filesystem *filesystem_table;
int current_filesystem_id;
int max_filesystem_id;
int allocated_filesytem;
int entry_fd;
int entry_eof;
int64_t entry_remaining_bytes;
int64_t entry_total;
unsigned char *entry_buff;
size_t entry_buff_size;
};
/* Definitions for tree.flags bitmap. */
#define hasStat 16 /* The st entry is valid. */
#define hasLstat 32 /* The lst entry is valid. */
#define onWorkingDir 64 /* We are on the working dir where we are
* reading directory entry at this time. */
#define needsRestoreTimes 128
static int
tree_dir_next_posix(struct tree *t);
#ifdef HAVE_DIRENT_D_NAMLEN
/* BSD extension; avoids need for a strlen() call. */
#define D_NAMELEN(dp) (dp)->d_namlen
#else
#define D_NAMELEN(dp) (strlen((dp)->d_name))
#endif
/* Initiate/terminate a tree traversal. */
static struct tree *tree_open(const char *, int, int);
static struct tree *tree_reopen(struct tree *, const char *, int);
static void tree_close(struct tree *);
static void tree_free(struct tree *);
static void tree_push(struct tree *, const char *, int, int64_t, int64_t,
struct restore_time *);
static int tree_enter_initial_dir(struct tree *);
static int tree_enter_working_dir(struct tree *);
static int tree_current_dir_fd(struct tree *);
/*
* tree_next() returns Zero if there is no next entry, non-zero if
* there is. Note that directories are visited three times.
* Directories are always visited first as part of enumerating their
* parent; that is a "regular" visit. If tree_descend() is invoked at
* that time, the directory is added to a work list and will
* subsequently be visited two more times: once just after descending
* into the directory ("postdescent") and again just after ascending
* back to the parent ("postascent").
*
* TREE_ERROR_DIR is returned if the descent failed (because the
* directory couldn't be opened, for instance). This is returned
* instead of TREE_POSTDESCENT/TREE_POSTASCENT. TREE_ERROR_DIR is not a
* fatal error, but it does imply that the relevant subtree won't be
* visited. TREE_ERROR_FATAL is returned for an error that left the
* traversal completely hosed. Right now, this is only returned for
* chdir() failures during ascent.
*/
#define TREE_REGULAR 1
#define TREE_POSTDESCENT 2
#define TREE_POSTASCENT 3
#define TREE_ERROR_DIR -1
#define TREE_ERROR_FATAL -2
static int tree_next(struct tree *);
/*
* Return information about the current entry.
*/
/*
* The current full pathname, length of the full pathname, and a name
* that can be used to access the file. Because tree does use chdir
* extensively, the access path is almost never the same as the full
* current path.
*
* TODO: On platforms that support it, use openat()-style operations
* to eliminate the chdir() operations entirely while still supporting
* arbitrarily deep traversals. This makes access_path troublesome to
* support, of course, which means we'll need a rich enough interface
* that clients can function without it. (In particular, we'll need
* tree_current_open() that returns an open file descriptor.)
*
*/
static const char *tree_current_path(struct tree *);
static const char *tree_current_access_path(struct tree *);
/*
* Request the lstat() or stat() data for the current path. Since the
* tree package needs to do some of this anyway, and caches the
* results, you should take advantage of it here if you need it rather
* than make a redundant stat() or lstat() call of your own.
*/
static const struct stat *tree_current_stat(struct tree *);
static const struct stat *tree_current_lstat(struct tree *);
static int tree_current_is_symblic_link_target(struct tree *);
/* The following functions use tricks to avoid a certain number of
* stat()/lstat() calls. */
/* "is_physical_dir" is equivalent to S_ISDIR(tree_current_lstat()->st_mode) */
static int tree_current_is_physical_dir(struct tree *);
/* "is_dir" is equivalent to S_ISDIR(tree_current_stat()->st_mode) */
static int tree_current_is_dir(struct tree *);
static int update_current_filesystem(struct archive_read_disk *a,
int64_t dev);
static int setup_current_filesystem(struct archive_read_disk *);
static int tree_target_is_same_as_parent(struct tree *, const struct stat *);
static int _archive_read_disk_open(struct archive *, const char *);
static int _archive_read_free(struct archive *);
static int _archive_read_close(struct archive *);
static int _archive_read_data_block(struct archive *,
const void **, size_t *, int64_t *);
static int _archive_read_next_header2(struct archive *,
struct archive_entry *);
static const char *trivial_lookup_gname(void *, int64_t gid);
static const char *trivial_lookup_uname(void *, int64_t uid);
static int setup_sparse(struct archive_read_disk *, struct archive_entry *);
static int close_and_restore_time(int fd, struct tree *,
struct restore_time *);
static struct archive_vtable *
archive_read_disk_vtable(void)
{
static struct archive_vtable av;
static int inited = 0;
if (!inited) {
av.archive_free = _archive_read_free;
av.archive_close = _archive_read_close;
av.archive_read_data_block = _archive_read_data_block;
av.archive_read_next_header2 = _archive_read_next_header2;
inited = 1;
}
return (&av);
}
const char *
archive_read_disk_gname(struct archive *_a, int64_t gid)
{
struct archive_read_disk *a = (struct archive_read_disk *)_a;
if (ARCHIVE_OK != __archive_check_magic(_a, ARCHIVE_READ_DISK_MAGIC,
ARCHIVE_STATE_ANY, "archive_read_disk_gname"))
return (NULL);
if (a->lookup_gname == NULL)
return (NULL);
return ((*a->lookup_gname)(a->lookup_gname_data, gid));
}
const char *
archive_read_disk_uname(struct archive *_a, int64_t uid)
{
struct archive_read_disk *a = (struct archive_read_disk *)_a;
if (ARCHIVE_OK != __archive_check_magic(_a, ARCHIVE_READ_DISK_MAGIC,
ARCHIVE_STATE_ANY, "archive_read_disk_uname"))
return (NULL);
if (a->lookup_uname == NULL)
return (NULL);
return ((*a->lookup_uname)(a->lookup_uname_data, uid));
}
int
archive_read_disk_set_gname_lookup(struct archive *_a,
void *private_data,
const char * (*lookup_gname)(void *private, int64_t gid),
void (*cleanup_gname)(void *private))
{
struct archive_read_disk *a = (struct archive_read_disk *)_a;
archive_check_magic(&a->archive, ARCHIVE_READ_DISK_MAGIC,
ARCHIVE_STATE_ANY, "archive_read_disk_set_gname_lookup");
if (a->cleanup_gname != NULL && a->lookup_gname_data != NULL)
(a->cleanup_gname)(a->lookup_gname_data);
a->lookup_gname = lookup_gname;
a->cleanup_gname = cleanup_gname;
a->lookup_gname_data = private_data;
return (ARCHIVE_OK);
}
int
archive_read_disk_set_uname_lookup(struct archive *_a,
void *private_data,
const char * (*lookup_uname)(void *private, int64_t uid),
void (*cleanup_uname)(void *private))
{
struct archive_read_disk *a = (struct archive_read_disk *)_a;
archive_check_magic(&a->archive, ARCHIVE_READ_DISK_MAGIC,
ARCHIVE_STATE_ANY, "archive_read_disk_set_uname_lookup");
if (a->cleanup_uname != NULL && a->lookup_uname_data != NULL)
(a->cleanup_uname)(a->lookup_uname_data);
a->lookup_uname = lookup_uname;
a->cleanup_uname = cleanup_uname;
a->lookup_uname_data = private_data;
return (ARCHIVE_OK);
}
/*
* Create a new archive_read_disk object and initialize it with global state.
*/
struct archive *
archive_read_disk_new(void)
{
struct archive_read_disk *a;
a = (struct archive_read_disk *)malloc(sizeof(*a));
if (a == NULL)
return (NULL);
memset(a, 0, sizeof(*a));
a->archive.magic = ARCHIVE_READ_DISK_MAGIC;
a->archive.state = ARCHIVE_STATE_NEW;
a->archive.vtable = archive_read_disk_vtable();
a->lookup_uname = trivial_lookup_uname;
a->lookup_gname = trivial_lookup_gname;
a->entry_wd_fd = -1;
return (&a->archive);
}
static int
_archive_read_free(struct archive *_a)
{
struct archive_read_disk *a = (struct archive_read_disk *)_a;
int r;
if (_a == NULL)
return (ARCHIVE_OK);
archive_check_magic(_a, ARCHIVE_READ_DISK_MAGIC,
ARCHIVE_STATE_ANY | ARCHIVE_STATE_FATAL, "archive_read_free");
if (a->archive.state != ARCHIVE_STATE_CLOSED)
r = _archive_read_close(&a->archive);
else
r = ARCHIVE_OK;
tree_free(a->tree);
if (a->cleanup_gname != NULL && a->lookup_gname_data != NULL)
(a->cleanup_gname)(a->lookup_gname_data);
if (a->cleanup_uname != NULL && a->lookup_uname_data != NULL)
(a->cleanup_uname)(a->lookup_uname_data);
archive_string_free(&a->archive.error_string);
a->archive.magic = 0;
__archive_clean(&a->archive);
free(a);
return (r);
}
static int
_archive_read_close(struct archive *_a)
{
struct archive_read_disk *a = (struct archive_read_disk *)_a;
archive_check_magic(_a, ARCHIVE_READ_DISK_MAGIC,
ARCHIVE_STATE_ANY | ARCHIVE_STATE_FATAL, "archive_read_close");
if (a->archive.state != ARCHIVE_STATE_FATAL)
a->archive.state = ARCHIVE_STATE_CLOSED;
tree_close(a->tree);
return (ARCHIVE_OK);
}
static void
setup_symlink_mode(struct archive_read_disk *a, char symlink_mode,
int follow_symlinks)
{
a->symlink_mode = symlink_mode;
a->follow_symlinks = follow_symlinks;
if (a->tree != NULL) {
a->tree->initial_symlink_mode = a->symlink_mode;
a->tree->symlink_mode = a->symlink_mode;
}
}
int
archive_read_disk_set_symlink_logical(struct archive *_a)
{
struct archive_read_disk *a = (struct archive_read_disk *)_a;
archive_check_magic(_a, ARCHIVE_READ_DISK_MAGIC,
ARCHIVE_STATE_ANY, "archive_read_disk_set_symlink_logical");
setup_symlink_mode(a, 'L', 1);
return (ARCHIVE_OK);
}
int
archive_read_disk_set_symlink_physical(struct archive *_a)
{
struct archive_read_disk *a = (struct archive_read_disk *)_a;
archive_check_magic(_a, ARCHIVE_READ_DISK_MAGIC,
ARCHIVE_STATE_ANY, "archive_read_disk_set_symlink_physical");
setup_symlink_mode(a, 'P', 0);
return (ARCHIVE_OK);
}
int
archive_read_disk_set_symlink_hybrid(struct archive *_a)
{
struct archive_read_disk *a = (struct archive_read_disk *)_a;
archive_check_magic(_a, ARCHIVE_READ_DISK_MAGIC,
ARCHIVE_STATE_ANY, "archive_read_disk_set_symlink_hybrid");
setup_symlink_mode(a, 'H', 1);/* Follow symlinks initially. */
return (ARCHIVE_OK);
}
int
archive_read_disk_set_atime_restored(struct archive *_a)
{
#ifndef HAVE_UTIMES
static int warning_done = 0;
#endif
struct archive_read_disk *a = (struct archive_read_disk *)_a;
archive_check_magic(_a, ARCHIVE_READ_DISK_MAGIC,
ARCHIVE_STATE_ANY, "archive_read_disk_restore_atime");
#ifdef HAVE_UTIMES
a->restore_time = 1;
if (a->tree != NULL)
a->tree->flags |= needsRestoreTimes;
return (ARCHIVE_OK);
#else
if (warning_done)
/* Warning was already emitted; suppress further warnings. */
return (ARCHIVE_OK);
archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
"Cannot restore access time on this system");
warning_done = 1;
return (ARCHIVE_WARN);
#endif
}
/*
* Trivial implementations of gname/uname lookup functions.
* These are normally overridden by the client, but these stub
* versions ensure that we always have something that works.
*/
static const char *
trivial_lookup_gname(void *private_data, int64_t gid)
{
(void)private_data; /* UNUSED */
(void)gid; /* UNUSED */
return (NULL);
}
static const char *
trivial_lookup_uname(void *private_data, int64_t uid)
{
(void)private_data; /* UNUSED */
(void)uid; /* UNUSED */
return (NULL);
}
/*
* Allocate memory for the reading buffer adjusted to the filesystem
* alignment.
*/
static int
setup_suitable_read_buffer(struct archive_read_disk *a)
{
struct tree *t = a->tree;
struct filesystem *cf = t->current_filesystem;
size_t asize;
size_t s;
if (cf->allocation_ptr == NULL) {
/* If we couldn't get a filesystem alignment,
* we use 4096 as default value but we won't use
* O_DIRECT to open() and openat() operations. */
long xfer_align = (cf->xfer_align == -1)?4096:cf->xfer_align;
if (cf->max_xfer_size != -1)
asize = cf->max_xfer_size + xfer_align;
else {
long incr = cf->incr_xfer_size;
/* Some platform does not set a proper value to
* incr_xfer_size.*/
if (incr < 0)
incr = cf->min_xfer_size;
if (cf->min_xfer_size < 0) {
incr = xfer_align;
asize = xfer_align;
} else
asize = cf->min_xfer_size;
/* Increase a buffer size up to 64K bytes in
* a proper incremant size. */
while (asize < 1024*64)
asize += incr;
/* Take a margin to adjust to the filesystem
* alignment. */
asize += xfer_align;
}
cf->allocation_ptr = malloc(asize);
if (cf->allocation_ptr == NULL) {
archive_set_error(&a->archive, ENOMEM,
"Couldn't allocate memory");
a->archive.state = ARCHIVE_STATE_FATAL;
return (ARCHIVE_FATAL);
}
/*
* Calculate proper address for the filesystem.
*/
s = (uintptr_t)cf->allocation_ptr;
s %= xfer_align;
if (s > 0)
s = xfer_align - s;
/*
* Set a read buffer pointer in the proper alignment of
* the current filesystem.
*/
cf->buff = cf->allocation_ptr + s;
cf->buff_size = asize - xfer_align;
}
return (ARCHIVE_OK);
}
static int
_archive_read_data_block(struct archive *_a, const void **buff,
size_t *size, int64_t *offset)
{
struct archive_read_disk *a = (struct archive_read_disk *)_a;
struct tree *t = a->tree;
int r;
ssize_t bytes;
size_t buffbytes;
archive_check_magic(_a, ARCHIVE_READ_DISK_MAGIC, ARCHIVE_STATE_DATA,
"archive_read_data_block");
if (t->entry_eof || t->entry_remaining_bytes <= 0) {
r = ARCHIVE_EOF;
goto abort_read_data;
}
/*
* Open the current file.
*/
if (t->entry_fd < 0) {
int flags = O_RDONLY | O_BINARY;
/*
* Eliminate or reduce cache effects if we can.
*
* Carefully consider this to be enabled.
*/
#if defined(O_DIRECT) && 0/* Disabled for now */
if (t->current_filesystem->xfer_align != -1 &&
t->nlink == 1)
flags |= O_DIRECT;
#endif
#if defined(O_NOATIME)
/*
* Linux has O_NOATIME flag; use it if we need.
*/
if ((t->flags & needsRestoreTimes) != 0 &&
t->restore_time.noatime == 0)
flags |= O_NOATIME;
do {
#endif
#ifdef HAVE_OPENAT
t->entry_fd = openat(tree_current_dir_fd(t),
tree_current_access_path(t), flags);
#else
tree_enter_working_dir(t);
t->entry_fd = open(tree_current_access_path(t), flags);
#endif
#if defined(O_NOATIME)
/*
* When we did open the file with O_NOATIME flag,
* if successful, set 1 to t->restore_time.noatime
* not to restore an atime of the file later.
* if failed by EPERM, retry it without O_NOATIME flag.
*/
if (flags & O_NOATIME) {
if (t->entry_fd >= 0)
t->restore_time.noatime = 1;
else if (errno == EPERM) {
flags &= ~O_NOATIME;
continue;
}
}
} while (0);
#endif
if (t->entry_fd < 0) {
archive_set_error(&a->archive, errno,
"Couldn't open %s", tree_current_path(t));
r = ARCHIVE_FAILED;
tree_enter_initial_dir(t);
goto abort_read_data;
}
tree_enter_initial_dir(t);
}
/*
* Allocate read buffer if not allocated.
*/
if (t->current_filesystem->allocation_ptr == NULL) {
r = setup_suitable_read_buffer(a);
if (r != ARCHIVE_OK) {
a->archive.state = ARCHIVE_STATE_FATAL;
goto abort_read_data;
}
}
t->entry_buff = t->current_filesystem->buff;
t->entry_buff_size = t->current_filesystem->buff_size;
buffbytes = t->entry_buff_size;
if (buffbytes > t->current_sparse->length)
buffbytes = t->current_sparse->length;
/*
* Skip hole.
* TODO: Should we consider t->current_filesystem->xfer_align?
*/
if (t->current_sparse->offset > t->entry_total) {
if (lseek(t->entry_fd,
(off_t)t->current_sparse->offset, SEEK_SET) < 0) {
archive_set_error(&a->archive, errno, "Seek error");
r = ARCHIVE_FATAL;
a->archive.state = ARCHIVE_STATE_FATAL;
goto abort_read_data;
}
bytes = t->current_sparse->offset - t->entry_total;
t->entry_remaining_bytes -= bytes;
t->entry_total += bytes;
}
/*
* Read file contents.
*/
if (buffbytes > 0) {
bytes = read(t->entry_fd, t->entry_buff, buffbytes);
if (bytes < 0) {
archive_set_error(&a->archive, errno, "Read error");
r = ARCHIVE_FATAL;
a->archive.state = ARCHIVE_STATE_FATAL;
goto abort_read_data;
}
} else
bytes = 0;
if (bytes == 0) {
/* Get EOF */
t->entry_eof = 1;
r = ARCHIVE_EOF;
goto abort_read_data;
}
*buff = t->entry_buff;
*size = bytes;
*offset = t->entry_total;
t->entry_total += bytes;
t->entry_remaining_bytes -= bytes;
if (t->entry_remaining_bytes == 0) {
/* Close the current file descriptor */
close_and_restore_time(t->entry_fd, t, &t->restore_time);
t->entry_fd = -1;
t->entry_eof = 1;
}
t->current_sparse->offset += bytes;
t->current_sparse->length -= bytes;
if (t->current_sparse->length == 0 && !t->entry_eof)
t->current_sparse++;
return (ARCHIVE_OK);
abort_read_data:
*buff = NULL;
*size = 0;
*offset = t->entry_total;
if (t->entry_fd >= 0) {
/* Close the current file descriptor */
close_and_restore_time(t->entry_fd, t, &t->restore_time);
t->entry_fd = -1;
}
return (r);
}
static int
_archive_read_next_header2(struct archive *_a, struct archive_entry *entry)
{
struct archive_read_disk *a = (struct archive_read_disk *)_a;
struct tree *t;
const struct stat *st; /* info to use for this entry */
const struct stat *lst;/* lstat() information */
int descend, fd = -1, r;
archive_check_magic(_a, ARCHIVE_READ_DISK_MAGIC,
ARCHIVE_STATE_HEADER | ARCHIVE_STATE_DATA,
"archive_read_next_header2");
t = a->tree;
if (t->entry_fd >= 0) {
close_and_restore_time(t->entry_fd, t, &t->restore_time);
t->entry_fd = -1;
}
#if !(defined(HAVE_OPENAT) && defined(HAVE_FSTATAT) && defined(HAVE_FDOPENDIR))
/* Restore working directory. */
tree_enter_working_dir(t);
#endif
st = NULL;
lst = NULL;
do {
switch (tree_next(t)) {
case TREE_ERROR_FATAL:
archive_set_error(&a->archive, t->tree_errno,
"%s: Unable to continue traversing directory tree",
tree_current_path(t));
a->archive.state = ARCHIVE_STATE_FATAL;
tree_enter_initial_dir(t);
return (ARCHIVE_FATAL);
case TREE_ERROR_DIR:
archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
"%s: Couldn't visit directory",
tree_current_path(t));
tree_enter_initial_dir(t);
return (ARCHIVE_FAILED);
case 0:
tree_enter_initial_dir(t);
return (ARCHIVE_EOF);
case TREE_POSTDESCENT:
case TREE_POSTASCENT:
break;
case TREE_REGULAR:
lst = tree_current_lstat(t);
if (lst == NULL) {
archive_set_error(&a->archive, errno,
"%s: Cannot stat",
tree_current_path(t));
tree_enter_initial_dir(t);
return (ARCHIVE_FAILED);
}
break;
}
} while (lst == NULL);
/*
* Distinguish 'L'/'P'/'H' symlink following.
*/
switch(t->symlink_mode) {
case 'H':
/* 'H': After the first item, rest like 'P'. */
t->symlink_mode = 'P';
/* 'H': First item (from command line) like 'L'. */
/* FALLTHROUGH */
case 'L':
/* 'L': Do descend through a symlink to dir. */
descend = tree_current_is_dir(t);
/* 'L': Follow symlinks to files. */
a->symlink_mode = 'L';
a->follow_symlinks = 1;
/* 'L': Archive symlinks as targets, if we can. */
st = tree_current_stat(t);
if (st != NULL && !tree_target_is_same_as_parent(t, st))
break;
/* If stat fails, we have a broken symlink;
* in that case, don't follow the link. */
/* FALLTHROUGH */
default:
/* 'P': Don't descend through a symlink to dir. */
descend = tree_current_is_physical_dir(t);
/* 'P': Don't follow symlinks to files. */
a->symlink_mode = 'P';
a->follow_symlinks = 0;
/* 'P': Archive symlinks as symlinks. */
st = lst;
break;
}
if (update_current_filesystem(a, st->st_dev) != ARCHIVE_OK) {
a->archive.state = ARCHIVE_STATE_FATAL;
tree_enter_initial_dir(t);
return (ARCHIVE_FATAL);
}
t->descend = descend;
archive_entry_set_pathname(entry, tree_current_path(t));
archive_entry_copy_sourcepath(entry, tree_current_access_path(t));
archive_entry_copy_stat(entry, st);
/* Save the times to be restored. */
t->restore_time.mtime = archive_entry_mtime(entry);
t->restore_time.mtime_nsec = archive_entry_mtime_nsec(entry);
t->restore_time.atime = archive_entry_atime(entry);
t->restore_time.atime_nsec = archive_entry_atime_nsec(entry);
t->restore_time.filetype = archive_entry_filetype(entry);
t->restore_time.noatime = t->current_filesystem->noatime;
#if defined(HAVE_OPENAT) && defined(HAVE_FSTATAT) && defined(HAVE_FDOPENDIR)
/*
* Open the current file to freely gather its metadata anywhere in
* working directory.
* Note: A symbolic link file cannot be opened with O_NOFOLLOW.
*/
if (a->follow_symlinks || archive_entry_filetype(entry) != AE_IFLNK)
fd = openat(tree_current_dir_fd(t), tree_current_access_path(t),
O_RDONLY | O_NONBLOCK);
/* Restore working directory if openat() operation failed or
* the file is a symbolic link. */
if (fd < 0)
tree_enter_working_dir(t);
/* The current direcotry fd is needed at
* archive_read_disk_entry_from_file() function to read link data
* with readlinkat(). */
a->entry_wd_fd = tree_current_dir_fd(t);
#endif
/*
* Populate the archive_entry with metadata from the disk.
*/
r = archive_read_disk_entry_from_file(&(a->archive), entry, fd, st);
/* Close the file descriptor used for reding the current file
* metadata at archive_read_disk_entry_from_file(). */
if (fd >= 0)
close(fd);
/* Return to the initial directory. */
tree_enter_initial_dir(t);
archive_entry_copy_sourcepath(entry, tree_current_path(t));
/*
* EOF and FATAL are persistent at this layer. By
* modifying the state, we guarantee that future calls to
* read a header or read data will fail.
*/
switch (r) {
case ARCHIVE_EOF:
a->archive.state = ARCHIVE_STATE_EOF;
break;
case ARCHIVE_OK:
case ARCHIVE_WARN:
t->entry_total = 0;
if (archive_entry_filetype(entry) == AE_IFREG) {
t->nlink = archive_entry_nlink(entry);
t->entry_remaining_bytes = archive_entry_size(entry);
t->entry_eof = (t->entry_remaining_bytes == 0)? 1: 0;
if (!t->entry_eof &&
setup_sparse(a, entry) != ARCHIVE_OK)
return (ARCHIVE_FATAL);
} else {
t->entry_remaining_bytes = 0;
t->entry_eof = 1;
}
a->archive.state = ARCHIVE_STATE_DATA;
break;
case ARCHIVE_RETRY:
break;
case ARCHIVE_FATAL:
a->archive.state = ARCHIVE_STATE_FATAL;
break;
}
return (r);
}
static int
setup_sparse(struct archive_read_disk *a, struct archive_entry *entry)
{
struct tree *t = a->tree;
int64_t length, offset;
int i;
t->sparse_count = archive_entry_sparse_reset(entry);
if (t->sparse_count+1 > t->sparse_list_size) {
free(t->sparse_list);
t->sparse_list_size = t->sparse_count + 1;
t->sparse_list = malloc(sizeof(t->sparse_list[0]) *
t->sparse_list_size);
if (t->sparse_list == NULL) {
t->sparse_list_size = 0;
archive_set_error(&a->archive, ENOMEM,
"Can't allocate data");
a->archive.state = ARCHIVE_STATE_FATAL;
return (ARCHIVE_FATAL);
}
}
for (i = 0; i < t->sparse_count; i++) {
archive_entry_sparse_next(entry, &offset, &length);
t->sparse_list[i].offset = offset;
t->sparse_list[i].length = length;
}
if (i == 0) {
t->sparse_list[i].offset = 0;
t->sparse_list[i].length = archive_entry_size(entry);
} else {
t->sparse_list[i].offset = archive_entry_size(entry);
t->sparse_list[i].length = 0;
}
t->current_sparse = t->sparse_list;
return (ARCHIVE_OK);
}
/*
* Called by the client to mark the directory just returned from
* tree_next() as needing to be visited.
*/
int
archive_read_disk_descend(struct archive *_a)
{
struct archive_read_disk *a = (struct archive_read_disk *)_a;
struct tree *t = a->tree;
archive_check_magic(_a, ARCHIVE_READ_DISK_MAGIC, ARCHIVE_STATE_DATA,
"archive_read_disk_descend");
if (t->visit_type != TREE_REGULAR || !t->descend) {
archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
"Ignored the request descending the current object");
return (ARCHIVE_WARN);
}
if (tree_current_is_physical_dir(t)) {
tree_push(t, t->basename, t->current_filesystem_id,
t->lst.st_dev, t->lst.st_ino, &t->restore_time);
t->stack->flags |= isDir;
} else if (tree_current_is_dir(t)) {
tree_push(t, t->basename, t->current_filesystem_id,
t->st.st_dev, t->st.st_ino, &t->restore_time);
t->stack->flags |= isDirLink;
}
t->descend = 0;
return (ARCHIVE_OK);
}
int
archive_read_disk_open(struct archive *_a, const char *pathname)
{
struct archive_read_disk *a = (struct archive_read_disk *)_a;
archive_check_magic(_a, ARCHIVE_READ_DISK_MAGIC,
ARCHIVE_STATE_NEW | ARCHIVE_STATE_CLOSED,
"archive_read_disk_open");
archive_clear_error(&a->archive);
return (_archive_read_disk_open(_a, pathname));
}
int
archive_read_disk_open_w(struct archive *_a, const wchar_t *pathname)
{
struct archive_read_disk *a = (struct archive_read_disk *)_a;
struct archive_string path;
int ret;
archive_check_magic(_a, ARCHIVE_READ_DISK_MAGIC,
ARCHIVE_STATE_NEW | ARCHIVE_STATE_CLOSED,
"archive_read_disk_open_w");
archive_clear_error(&a->archive);
/* Make a char string from a wchar_t string. */
archive_string_init(&path);
if (archive_string_append_from_wcs(&path, pathname,
wcslen(pathname)) != 0) {
archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
"Can't convert a path to a char string");
a->archive.state = ARCHIVE_STATE_FATAL;
ret = ARCHIVE_FATAL;
} else
ret = _archive_read_disk_open(_a, path.s);
archive_string_free(&path);
return (ret);
}
static int
_archive_read_disk_open(struct archive *_a, const char *pathname)
{
struct archive_read_disk *a = (struct archive_read_disk *)_a;
if (a->tree != NULL)
a->tree = tree_reopen(a->tree, pathname, a->restore_time);
else
a->tree = tree_open(pathname, a->symlink_mode,
a->restore_time);
if (a->tree == NULL) {
archive_set_error(&a->archive, ENOMEM,
"Can't allocate tar data");
a->archive.state = ARCHIVE_STATE_FATAL;
return (ARCHIVE_FATAL);
}
a->archive.state = ARCHIVE_STATE_HEADER;
return (ARCHIVE_OK);
}
/*
* Return a current filesystem ID which is index of the filesystem entry
* you've visited through archive_read_disk.
*/
int
archive_read_disk_current_filesystem(struct archive *_a)
{
struct archive_read_disk *a = (struct archive_read_disk *)_a;
archive_check_magic(_a, ARCHIVE_READ_DISK_MAGIC, ARCHIVE_STATE_DATA,
"archive_read_disk_current_filesystem");
return (a->tree->current_filesystem_id);
}
static int
update_current_filesystem(struct archive_read_disk *a, int64_t dev)
{
struct tree *t = a->tree;
int i, fid;
if (t->current_filesystem != NULL &&
t->current_filesystem->dev == dev)
return (ARCHIVE_OK);
for (i = 0; i < t->max_filesystem_id; i++) {
if (t->filesystem_table[i].dev == dev) {
/* There is the filesytem ID we've already generated. */
t->current_filesystem_id = i;
t->current_filesystem = &(t->filesystem_table[i]);
return (ARCHIVE_OK);
}
}
/*
* This is the new filesytem which we have to generate a new ID for.
*/
fid = t->max_filesystem_id++;
if (t->max_filesystem_id > t->allocated_filesytem) {
size_t s;
s = t->max_filesystem_id * 2;
t->filesystem_table = realloc(t->filesystem_table,
s * sizeof(*t->filesystem_table));
if (t->filesystem_table == NULL) {
archive_set_error(&a->archive, ENOMEM,
"Can't allocate tar data");
return (ARCHIVE_FATAL);
}
t->allocated_filesytem = s;
}
t->current_filesystem_id = fid;
t->current_filesystem = &(t->filesystem_table[fid]);
t->current_filesystem->dev = dev;
t->current_filesystem->allocation_ptr = NULL;
t->current_filesystem->buff = NULL;
/* Setup the current filesystem properties which depend on
* platform specific. */
return (setup_current_filesystem(a));
}
/*
* Returns 1 if current filesystem is generated filesystem, 0 if it is not
* or -1 if it is unknown.
*/
int
archive_read_disk_current_filesystem_is_synthetic(struct archive *_a)
{
struct archive_read_disk *a = (struct archive_read_disk *)_a;
archive_check_magic(_a, ARCHIVE_READ_DISK_MAGIC, ARCHIVE_STATE_DATA,
"archive_read_disk_current_filesystem");
return (a->tree->current_filesystem->synthetic);
}
/*
* Returns 1 if current filesystem is remote filesystem, 0 if it is not
* or -1 if it is unknown.
*/
int
archive_read_disk_current_filesystem_is_remote(struct archive *_a)
{
struct archive_read_disk *a = (struct archive_read_disk *)_a;
archive_check_magic(_a, ARCHIVE_READ_DISK_MAGIC, ARCHIVE_STATE_DATA,
"archive_read_disk_current_filesystem");
return (a->tree->current_filesystem->remote);
}
#if defined(_PC_REC_INCR_XFER_SIZE) && defined(_PC_REC_MAX_XFER_SIZE) &&\
defined(_PC_REC_MIN_XFER_SIZE) && defined(_PC_REC_XFER_ALIGN)
static int
get_xfer_size(struct tree *t, int fd, const char *path)
{
t->current_filesystem->xfer_align = -1;
errno = 0;
if (fd >= 0) {
t->current_filesystem->incr_xfer_size =
fpathconf(fd, _PC_REC_INCR_XFER_SIZE);
t->current_filesystem->max_xfer_size =
fpathconf(fd, _PC_REC_MAX_XFER_SIZE);
t->current_filesystem->min_xfer_size =
fpathconf(fd, _PC_REC_MIN_XFER_SIZE);
t->current_filesystem->xfer_align =
fpathconf(fd, _PC_REC_XFER_ALIGN);
} else if (path != NULL) {
t->current_filesystem->incr_xfer_size =
pathconf(path, _PC_REC_INCR_XFER_SIZE);
t->current_filesystem->max_xfer_size =
pathconf(path, _PC_REC_MAX_XFER_SIZE);
t->current_filesystem->min_xfer_size =
pathconf(path, _PC_REC_MIN_XFER_SIZE);
t->current_filesystem->xfer_align =
pathconf(path, _PC_REC_XFER_ALIGN);
}
/* At least we need an alignment size. */
if (t->current_filesystem->xfer_align == -1)
return ((errno == EINVAL)?1:-1);
else
return (0);
}
#else
static int
get_xfer_size(struct tree *t, int fd, const char *path)
{
(void)t; /* UNUSED */
(void)fd; /* UNUSED */
(void)path; /* UNUSED */
return (1);/* Not supported */
}
#endif
#if defined(HAVE_STATFS) && defined(HAVE_FSTATFS) && defined(MNT_LOCAL) \
&& !defined(ST_LOCAL)
/*
* Gather current filesystem properties on FreeBSD, OpenBSD and Mac OS X.
*/
static int
setup_current_filesystem(struct archive_read_disk *a)
{
struct tree *t = a->tree;
struct statfs sfs;
#if defined(HAVE_GETVFSBYNAME) && defined(VFCF_SYNTHETIC)
struct xvfsconf vfc;
#endif
int r, xr = 0;
#if !defined(HAVE_STRUCT_STATFS_F_NAMEMAX)
long nm;
#endif
t->current_filesystem->synthetic = -1;
t->current_filesystem->remote = -1;
if (tree_current_is_symblic_link_target(t)) {
#if defined(HAVE_OPENAT) && defined(HAVE_FSTATAT) && defined(HAVE_FDOPENDIR)
/*
* Get file system statistics on any directory
* where current is.
*/
int fd = openat(tree_current_dir_fd(t),
tree_current_access_path(t), O_RDONLY);
if (fd < 0) {
archive_set_error(&a->archive, errno,
"openat failed");
return (ARCHIVE_FAILED);
}
r = fstatfs(fd, &sfs);
if (r == 0)
xr = get_xfer_size(t, fd, NULL);
close(fd);
#else
r = statfs(tree_current_access_path(t), &sfs);
if (r == 0)
xr = get_xfer_size(t, -1, tree_current_access_path(t));
#endif
} else {
r = fstatfs(tree_current_dir_fd(t), &sfs);
if (r == 0)
xr = get_xfer_size(t, tree_current_dir_fd(t), NULL);
}
if (r == -1 || xr == -1) {
archive_set_error(&a->archive, errno, "statfs failed");
return (ARCHIVE_FAILED);
} else if (xr == 1) {
/* pathconf(_PC_REX_*) operations are not supported. */
t->current_filesystem->xfer_align = sfs.f_bsize;
t->current_filesystem->max_xfer_size = -1;
t->current_filesystem->min_xfer_size = sfs.f_iosize;
t->current_filesystem->incr_xfer_size = sfs.f_iosize;
}
if (sfs.f_flags & MNT_LOCAL)
t->current_filesystem->remote = 0;
else
t->current_filesystem->remote = 1;
#if defined(HAVE_GETVFSBYNAME) && defined(VFCF_SYNTHETIC)
r = getvfsbyname(sfs.f_fstypename, &vfc);
if (r == -1) {
archive_set_error(&a->archive, errno, "getvfsbyname failed");
return (ARCHIVE_FAILED);
}
if (vfc.vfc_flags & VFCF_SYNTHETIC)
t->current_filesystem->synthetic = 1;
else
t->current_filesystem->synthetic = 0;
#endif
if (sfs.f_flags & MNT_NOATIME)
t->current_filesystem->noatime = 1;
else
t->current_filesystem->noatime = 0;
#if defined(HAVE_READDIR_R)
/* Set maximum filename length. */
#if defined(HAVE_STRUCT_STATFS_F_NAMEMAX)
t->current_filesystem->name_max = sfs.f_namemax;
#else
/* Mac OS X does not have f_namemax in struct statfs. */
if (tree_current_is_symblic_link_target(t))
nm = pathconf(tree_current_access_path(t), _PC_NAME_MAX);
else
nm = fpathconf(tree_current_dir_fd(t), _PC_NAME_MAX);
if (nm == -1)
t->current_filesystem->name_max = NAME_MAX;
else
t->current_filesystem->name_max = nm;
#endif
#endif /* HAVE_READDIR_R */
return (ARCHIVE_OK);
}
#elif (defined(HAVE_STATVFS) || defined(HAVE_FSTATVFS)) && defined(ST_LOCAL)
/*
* Gather current filesystem properties on NetBSD
*/
static int
setup_current_filesystem(struct archive_read_disk *a)
{
struct tree *t = a->tree;
struct statvfs sfs;
int r, xr = 0;
t->current_filesystem->synthetic = -1;
if (tree_current_is_symblic_link_target(t)) {
r = statvfs(tree_current_access_path(t), &sfs);
if (r == 0)
xr = get_xfer_size(t, -1, tree_current_access_path(t));
} else {
#ifdef HAVE_FSTATVFS
r = fstatvfs(tree_current_dir_fd(t), &sfs);
if (r == 0)
xr = get_xfer_size(t, tree_current_dir_fd(t), NULL);
#else
r = statvfs(".", &sfs);
if (r == 0)
xr = get_xfer_size(t, -1, ".");
#endif
}
if (r == -1 || xr == -1) {
t->current_filesystem->remote = -1;
archive_set_error(&a->archive, errno, "statvfs failed");
return (ARCHIVE_FAILED);
} else if (xr == 1) {
/* Usuall come here unless NetBSD supports _PC_REC_XFER_ALIGN
* for pathconf() function. */
t->current_filesystem->xfer_align = sfs.f_frsize;
t->current_filesystem->max_xfer_size = -1;
t->current_filesystem->min_xfer_size = sfs.f_iosize;
t->current_filesystem->incr_xfer_size = sfs.f_iosize;
}
if (sfs.f_flag & ST_LOCAL)
t->current_filesystem->remote = 0;
else
t->current_filesystem->remote = 1;
if (sfs.f_flag & ST_NOATIME)
t->current_filesystem->noatime = 1;
else
t->current_filesystem->noatime = 0;
/* Set maximum filename length. */
t->current_filesystem->name_max = sfs.f_namemax;
return (ARCHIVE_OK);
}
#elif defined(HAVE_SYS_STATFS_H) && defined(HAVE_LINUX_MAGIC_H) &&\
defined(HAVE_STATFS) && defined(HAVE_FSTATFS)
/*
* Note: statfs is deprecated since LSB 3.2
*/
#ifndef CIFS_SUPER_MAGIC
#define CIFS_SUPER_MAGIC 0xFF534D42
#endif
#ifndef DEVFS_SUPER_MAGIC
#define DEVFS_SUPER_MAGIC 0x1373
#endif
/*
* Gather current filesystem properties on Linux
*/
static int
setup_current_filesystem(struct archive_read_disk *a)
{
struct tree *t = a->tree;
struct statfs sfs;
struct statvfs svfs;
int r, vr = 0, xr = 0;
if (tree_current_is_symblic_link_target(t)) {
#if defined(HAVE_OPENAT) && defined(HAVE_FSTATAT) && defined(HAVE_FDOPENDIR)
/*
* Get file system statistics on any directory
* where current is.
*/
int fd = openat(tree_current_dir_fd(t),
tree_current_access_path(t), O_RDONLY);
if (fd < 0) {
archive_set_error(&a->archive, errno,
"openat failed");
return (ARCHIVE_FAILED);
}
vr = fstatvfs(fd, &svfs);/* for f_flag, mount flags */
r = fstatfs(fd, &sfs);
if (r == 0)
xr = get_xfer_size(t, fd, NULL);
close(fd);
#else
vr = statvfs(tree_current_access_path(t), &svfs);
r = statfs(tree_current_access_path(t), &sfs);
if (r == 0)
xr = get_xfer_size(t, -1, tree_current_access_path(t));
#endif
} else {
#ifdef HAVE_FSTATFS
vr = fstatvfs(tree_current_dir_fd(t), &svfs);
r = fstatfs(tree_current_dir_fd(t), &sfs);
if (r == 0)
xr = get_xfer_size(t, tree_current_dir_fd(t), NULL);
#elif defined(HAVE_OPENAT) && defined(HAVE_FSTATAT) && defined(HAVE_FDOPENDIR)
#error "Unexpected case. Please tell us about this error."
#else
vr = statvfs(".", &svfs);
r = statfs(".", &sfs);
if (r == 0)
xr = get_xfer_size(t, -1, ".");
#endif
}
if (r == -1 || xr == -1 || vr == -1) {
t->current_filesystem->synthetic = -1;
t->current_filesystem->remote = -1;
archive_set_error(&a->archive, errno, "statfs failed");
return (ARCHIVE_FAILED);
} else if (xr == 1) {
/* pathconf(_PC_REX_*) operations are not supported. */
t->current_filesystem->xfer_align = svfs.f_frsize;
t->current_filesystem->max_xfer_size = -1;
t->current_filesystem->min_xfer_size = svfs.f_bsize;
t->current_filesystem->incr_xfer_size = svfs.f_bsize;
}
switch (sfs.f_type) {
case AFS_SUPER_MAGIC:
case CIFS_SUPER_MAGIC:
case CODA_SUPER_MAGIC:
case NCP_SUPER_MAGIC:/* NetWare */
case NFS_SUPER_MAGIC:
case SMB_SUPER_MAGIC:
t->current_filesystem->remote = 1;
t->current_filesystem->synthetic = 0;
break;
case DEVFS_SUPER_MAGIC:
case PROC_SUPER_MAGIC:
case USBDEVICE_SUPER_MAGIC:
t->current_filesystem->remote = 0;
t->current_filesystem->synthetic = 1;
break;
default:
t->current_filesystem->remote = 0;
t->current_filesystem->synthetic = 0;
break;
}
#if defined(ST_NOATIME)
if (svfs.f_flag & ST_NOATIME)
t->current_filesystem->noatime = 1;
else
#endif
t->current_filesystem->noatime = 0;
#if defined(HAVE_READDIR_R)
/* Set maximum filename length. */
t->current_filesystem->name_max = sfs.f_namelen;
#endif
return (ARCHIVE_OK);
}
#elif defined(HAVE_SYS_STATVFS_H) &&\
(defined(HAVE_STATVFS) || defined(HAVE_FSTATVFS))
/*
* Gather current filesystem properties on other posix platform.
*/
static int
setup_current_filesystem(struct archive_read_disk *a)
{
struct tree *t = a->tree;
struct statvfs sfs;
int r, xr = 0;
t->current_filesystem->synthetic = -1;/* Not supported */
t->current_filesystem->remote = -1;/* Not supported */
if (tree_current_is_symblic_link_target(t)) {
#if defined(HAVE_OPENAT) && defined(HAVE_FSTATAT) && defined(HAVE_FDOPENDIR)
/*
* Get file system statistics on any directory
* where current is.
*/
int fd = openat(tree_current_dir_fd(t),
tree_current_access_path(t), O_RDONLY);
if (fd < 0) {
archive_set_error(&a->archive, errno,
"openat failed");
return (ARCHIVE_FAILED);
}
r = fstatvfs(fd, &sfs);
if (r == 0)
xr = get_xfer_size(t, fd, NULL);
close(fd);
#else
r = statvfs(tree_current_access_path(t), &sfs);
if (r == 0)
xr = get_xfer_size(t, -1, tree_current_access_path(t));
#endif
} else {
#ifdef HAVE_FSTATVFS
r = fstatvfs(tree_current_dir_fd(t), &sfs);
if (r == 0)
xr = get_xfer_size(t, tree_current_dir_fd(t), NULL);
#elif defined(HAVE_OPENAT) && defined(HAVE_FSTATAT) && defined(HAVE_FDOPENDIR)
#error "Unexpected case. Please tell us about this error."
#else
r = statvfs(".", &sfs);
if (r == 0)
xr = get_xfer_size(t, -1, ".");
#endif
}
if (r == -1 || xr == -1) {
t->current_filesystem->synthetic = -1;
t->current_filesystem->remote = -1;
archive_set_error(&a->archive, errno, "statvfs failed");
return (ARCHIVE_FAILED);
} else if (xr == 1) {
/* pathconf(_PC_REX_*) operations are not supported. */
t->current_filesystem->xfer_align = sfs.f_frsize;
t->current_filesystem->max_xfer_size = -1;
t->current_filesystem->min_xfer_size = sfs.f_bsize;
t->current_filesystem->incr_xfer_size = sfs.f_bsize;
}
#if defined(ST_NOATIME)
if (sfs.f_flag & ST_NOATIME)
t->current_filesystem->noatime = 1;
else
#endif
t->current_filesystem->noatime = 0;
#if defined(HAVE_READDIR_R)
/* Set maximum filename length. */
t->current_filesystem->name_max = sfs.f_namemax;
#endif
return (ARCHIVE_OK);
}
#else
/*
* Generic: Gather current filesystem properties.
* TODO: Is this generic function really needed?
*/
static int
setup_current_filesystem(struct archive_read_disk *a)
{
struct tree *t = a->tree;
#if defined(_PC_NAME_MAX) && defined(HAVE_READDIR_R)
long nm;
#endif
t->current_filesystem->synthetic = -1;/* Not supported */
t->current_filesystem->remote = -1;/* Not supported */
t->current_filesystem->noatime = 0;
(void)get_xfer_size(t, -1, ".");/* Dummy call to avoid build error. */
t->current_filesystem->xfer_align = -1;/* Unknown */
t->current_filesystem->max_xfer_size = -1;
t->current_filesystem->min_xfer_size = -1;
t->current_filesystem->incr_xfer_size = -1;
#if defined(HAVE_READDIR_R)
/* Set maximum filename length. */
# if defined(_PC_NAME_MAX)
if (tree_current_is_symblic_link_target(t))
nm = pathconf(tree_current_access_path(t), _PC_NAME_MAX);
else
nm = fpathconf(tree_current_dir_fd(t), _PC_NAME_MAX);
if (nm == -1)
# endif /* _PC_NAME_MAX */
/*
* Some sysmtes (HP-UX or others?) incorrectly defined
* NAME_MAX macro to be a smaller value.
*/
# if defined(NAME_MAX) && NAME_MAX >= 255
t->current_filesystem->name_max = NAME_MAX;
# else
/* No way to get a trusted value of maximum filename
* length. */
t->current_filesystem->name_max = PATH_MAX;
# endif /* NAME_MAX */
# if defined(_PC_NAME_MAX)
else
t->current_filesystem->name_max = nm;
# endif /* _PC_NAME_MAX */
#endif /* HAVE_READDIR_R */
return (ARCHIVE_OK);
}
#endif
static int
close_and_restore_time(int fd, struct tree *t, struct restore_time *rt)
{
#ifndef HAVE_UTIMES
(void)a; /* UNUSED */
return (close(fd));
#else
#if defined(HAVE_FUTIMENS) && !defined(__CYGWIN__)
struct timespec timespecs[2];
#endif
struct timeval times[2];
if ((t->flags & needsRestoreTimes) == 0 || rt->noatime) {
if (fd >= 0)
return (close(fd));
else
return (0);
}
#if defined(HAVE_FUTIMENS) && !defined(__CYGWIN__)
timespecs[1].tv_sec = rt->mtime;
timespecs[1].tv_nsec = rt->mtime_nsec;
timespecs[0].tv_sec = rt->atime;
timespecs[0].tv_nsec = rt->atime_nsec;
/* futimens() is defined in POSIX.1-2008. */
if (futimens(fd, timespecs) == 0)
return (close(fd));
#endif
times[1].tv_sec = rt->mtime;
times[1].tv_usec = rt->mtime_nsec / 1000;
times[0].tv_sec = rt->atime;
times[0].tv_usec = rt->atime_nsec / 1000;
#if !defined(HAVE_FUTIMENS) && defined(HAVE_FUTIMES) && !defined(__CYGWIN__)
if (futimes(fd, times) == 0)
return (close(fd));
#endif
close(fd);
#if defined(HAVE_FUTIMESAT)
if (futimesat(tree_current_dir_fd(t), rt->name, times) == 0)
return (0);
#endif
#ifdef HAVE_LUTIMES
if (lutimes(rt->name, times) != 0)
#else
if (AE_IFLNK != rt->filetype && utimes(rt->name, times) != 0)
#endif
return (-1);
#endif
return (0);
}
/*
* Add a directory path to the current stack.
*/
static void
tree_push(struct tree *t, const char *path, int filesystem_id,
int64_t dev, int64_t ino, struct restore_time *rt)
{
struct tree_entry *te;
te = malloc(sizeof(*te));
memset(te, 0, sizeof(*te));
te->next = t->stack;
te->parent = t->current;
if (te->parent)
te->depth = te->parent->depth + 1;
t->stack = te;
archive_string_init(&te->name);
te->symlink_parent_fd = -1;
archive_strcpy(&te->name, path);
te->flags = needsDescent | needsOpen | needsAscent;
te->filesystem_id = filesystem_id;
te->dev = dev;
te->ino = ino;
te->dirname_length = t->dirname_length;
te->restore_time.name = te->name.s;
if (rt != NULL) {
te->restore_time.mtime = rt->mtime;
te->restore_time.mtime_nsec = rt->mtime_nsec;
te->restore_time.atime = rt->atime;
te->restore_time.atime_nsec = rt->atime_nsec;
te->restore_time.filetype = rt->filetype;
te->restore_time.noatime = rt->noatime;
}
}
/*
* Append a name to the current dir path.
*/
static void
tree_append(struct tree *t, const char *name, size_t name_length)
{
size_t size_needed;
t->path.s[t->dirname_length] = '\0';
t->path.length = t->dirname_length;
/* Strip trailing '/' from name, unless entire name is "/". */
while (name_length > 1 && name[name_length - 1] == '/')
name_length--;
/* Resize pathname buffer as needed. */
size_needed = name_length + t->dirname_length + 2;
archive_string_ensure(&t->path, size_needed);
/* Add a separating '/' if it's needed. */
if (t->dirname_length > 0 && t->path.s[archive_strlen(&t->path)-1] != '/')
archive_strappend_char(&t->path, '/');
t->basename = t->path.s + archive_strlen(&t->path);
archive_strncat(&t->path, name, name_length);
t->restore_time.name = t->basename;
}
/*
* Open a directory tree for traversal.
*/
static struct tree *
tree_open(const char *path, int symlink_mode, int restore_time)
{
struct tree *t;
if ((t = malloc(sizeof(*t))) == NULL)
return (NULL);
memset(t, 0, sizeof(*t));
archive_string_init(&t->path);
archive_string_ensure(&t->path, 31);
t->initial_symlink_mode = symlink_mode;
return (tree_reopen(t, path, restore_time));
}
static struct tree *
tree_reopen(struct tree *t, const char *path, int restore_time)
{
t->flags = (restore_time)?needsRestoreTimes:0;
t->visit_type = 0;
t->tree_errno = 0;
t->dirname_length = 0;
t->depth = 0;
t->descend = 0;
t->current = NULL;
t->d = INVALID_DIR_HANDLE;
t->symlink_mode = t->initial_symlink_mode;
archive_string_empty(&t->path);
t->entry_fd = -1;
t->entry_eof = 0;
t->entry_remaining_bytes = 0;
/* First item is set up a lot like a symlink traversal. */
tree_push(t, path, 0, 0, 0, NULL);
t->stack->flags = needsFirstVisit;
t->maxOpenCount = t->openCount = 1;
t->initial_dir_fd = open(".", O_RDONLY);
t->working_dir_fd = dup(t->initial_dir_fd);
return (t);
}
static int
tree_descent(struct tree *t)
{
int r = 0;
#if defined(HAVE_OPENAT) && defined(HAVE_FSTATAT) && defined(HAVE_FDOPENDIR)
int new_fd;
t->dirname_length = archive_strlen(&t->path);
new_fd = openat(t->working_dir_fd, t->stack->name.s, O_RDONLY);
if (new_fd < 0) {
t->tree_errno = errno;
r = TREE_ERROR_DIR;
} else {
t->depth++;
/* If it is a link, set up fd for the ascent. */
if (t->stack->flags & isDirLink) {
t->stack->symlink_parent_fd = t->working_dir_fd;
t->openCount++;
if (t->openCount > t->maxOpenCount)
t->maxOpenCount = t->openCount;
} else
close(t->working_dir_fd);
t->working_dir_fd = new_fd;
}
#else
/* If it is a link, set up fd for the ascent. */
if (t->stack->flags & isDirLink)
t->stack->symlink_parent_fd = t->working_dir_fd;
else {
close(t->working_dir_fd);
t->openCount--;
}
t->working_dir_fd = -1;
t->dirname_length = archive_strlen(&t->path);
if (chdir(t->stack->name.s) != 0)
{
t->tree_errno = errno;
r = TREE_ERROR_DIR;
} else {
t->depth++;
t->working_dir_fd = open(".", O_RDONLY);
t->openCount++;
if (t->openCount > t->maxOpenCount)
t->maxOpenCount = t->openCount;
}
#endif
return (r);
}
/*
* We've finished a directory; ascend back to the parent.
*/
static int
tree_ascend(struct tree *t)
{
struct tree_entry *te;
int r = 0, prev_dir_fd;
te = t->stack;
prev_dir_fd = t->working_dir_fd;
#if defined(HAVE_OPENAT) && defined(HAVE_FSTATAT) && defined(HAVE_FDOPENDIR)
if (te->flags & isDirLink)
t->working_dir_fd = te->symlink_parent_fd;
else {
int new_fd = openat(t->working_dir_fd, "..", O_RDONLY);
if (new_fd < 0) {
t->tree_errno = errno;
r = TREE_ERROR_FATAL;
} else
t->working_dir_fd = new_fd;
}
#else
if (te->flags & isDirLink) {
if (fchdir(te->symlink_parent_fd) != 0) {
t->tree_errno = errno;
r = TREE_ERROR_FATAL;
} else
t->working_dir_fd = te->symlink_parent_fd;
} else {
if (chdir("..") != 0) {
t->tree_errno = errno;
r = TREE_ERROR_FATAL;
} else
t->working_dir_fd = open(".", O_RDONLY);
}
#endif
if (r == 0) {
/* Current directory has been changed, we should
* close an fd of previous working directory. */
close_and_restore_time(prev_dir_fd, t, &te->restore_time);
if (te->flags & isDirLink) {
t->openCount--;
te->symlink_parent_fd = -1;
}
t->depth--;
}
return (r);
}
/*
* Return to the initial directory where tree_open() was performed.
*/
static int
tree_enter_initial_dir(struct tree *t)
{
int r = 0;
if (t->flags & onWorkingDir) {
r = fchdir(t->initial_dir_fd);
if (r == 0)
t->flags &= ~onWorkingDir;
}
return (r);
}
/*
* Restore working directory of directory traversals.
*/
static int
tree_enter_working_dir(struct tree *t)
{
int r = 0;
/*
* Change the current directory if really needed.
* Sometimes this is unneeded when we did not do
* descent.
*/
if (t->depth > 0 && (t->flags & onWorkingDir) == 0) {
r = fchdir(t->working_dir_fd);
if (r == 0)
t->flags |= onWorkingDir;
}
return (r);
}
static int
tree_current_dir_fd(struct tree *t)
{
return (t->working_dir_fd);
}
/*
* Pop the working stack.
*/
static void
tree_pop(struct tree *t)
{
struct tree_entry *te;
t->path.s[t->dirname_length] = '\0';
t->path.length = t->dirname_length;
if (t->stack == t->current && t->current != NULL)
t->current = t->current->parent;
te = t->stack;
t->stack = te->next;
t->dirname_length = te->dirname_length;
t->basename = t->path.s + t->dirname_length;
while (t->basename[0] == '/')
t->basename++;
archive_string_free(&te->name);
free(te);
}
/*
* Get the next item in the tree traversal.
*/
static int
tree_next(struct tree *t)
{
int r;
while (t->stack != NULL) {
/* If there's an open dir, get the next entry from there. */
if (t->d != INVALID_DIR_HANDLE) {
r = tree_dir_next_posix(t);
if (r == 0)
continue;
return (r);
}
if (t->stack->flags & needsFirstVisit) {
/* Top stack item needs a regular visit. */
t->current = t->stack;
tree_append(t, t->stack->name.s,
archive_strlen(&(t->stack->name)));
/* t->dirname_length = t->path_length; */
/* tree_pop(t); */
t->stack->flags &= ~needsFirstVisit;
return (t->visit_type = TREE_REGULAR);
} else if (t->stack->flags & needsDescent) {
/* Top stack item is dir to descend into. */
t->current = t->stack;
tree_append(t, t->stack->name.s,
archive_strlen(&(t->stack->name)));
t->stack->flags &= ~needsDescent;
r = tree_descent(t);
if (r != 0) {
tree_pop(t);
t->visit_type = r;
} else
t->visit_type = TREE_POSTDESCENT;
return (t->visit_type);
} else if (t->stack->flags & needsOpen) {
t->stack->flags &= ~needsOpen;
r = tree_dir_next_posix(t);
if (r == 0)
continue;
return (r);
} else if (t->stack->flags & needsAscent) {
/* Top stack item is dir and we're done with it. */
r = tree_ascend(t);
tree_pop(t);
t->visit_type = r != 0 ? r : TREE_POSTASCENT;
return (t->visit_type);
} else {
/* Top item on stack is dead. */
tree_pop(t);
t->flags &= ~hasLstat;
t->flags &= ~hasStat;
}
}
return (t->visit_type = 0);
}
static int
tree_dir_next_posix(struct tree *t)
{
int r;
const char *name;
size_t namelen;
if (t->d == NULL) {
#if defined(HAVE_READDIR_R)
size_t dirent_size;
#endif
#if defined(HAVE_FDOPENDIR)
if ((t->d = fdopendir(dup(t->working_dir_fd))) == NULL) {
#else
if ((t->d = opendir(".")) == NULL) {
#endif
r = tree_ascend(t); /* Undo "chdir" */
tree_pop(t);
t->tree_errno = errno;
t->visit_type = r != 0 ? r : TREE_ERROR_DIR;
return (t->visit_type);
}
#if defined(HAVE_READDIR_R)
dirent_size = offsetof(struct dirent, d_name) +
t->filesystem_table[t->current->filesystem_id].name_max + 1;
if (t->dirent == NULL || t->dirent_allocated < dirent_size) {
free(t->dirent);
t->dirent = malloc(dirent_size);
if (t->dirent == NULL) {
closedir(t->d);
t->d = INVALID_DIR_HANDLE;
(void)tree_ascend(t);
tree_pop(t);
t->tree_errno = ENOMEM;
t->visit_type = TREE_ERROR_DIR;
return (t->visit_type);
}
t->dirent_allocated = dirent_size;
}
#endif /* HAVE_READDIR_R */
}
for (;;) {
#if defined(HAVE_READDIR_R)
r = readdir_r(t->d, t->dirent, &t->de);
if (r != 0 || t->de == NULL) {
#else
errno = 0;
t->de = readdir(t->d);
if (t->de == NULL) {
r = errno;
#endif
closedir(t->d);
t->d = INVALID_DIR_HANDLE;
if (r != 0) {
t->tree_errno = r;
t->visit_type = TREE_ERROR_DIR;
return (t->visit_type);
} else
return (0);
}
name = t->de->d_name;
namelen = D_NAMELEN(t->de);
t->flags &= ~hasLstat;
t->flags &= ~hasStat;
if (name[0] == '.' && name[1] == '\0')
continue;
if (name[0] == '.' && name[1] == '.' && name[2] == '\0')
continue;
tree_append(t, name, namelen);
return (t->visit_type = TREE_REGULAR);
}
}
/*
* Get the stat() data for the entry just returned from tree_next().
*/
static const struct stat *
tree_current_stat(struct tree *t)
{
if (!(t->flags & hasStat)) {
#ifdef HAVE_FSTATAT
if (fstatat(tree_current_dir_fd(t),
tree_current_access_path(t), &t->st, 0) != 0)
#else
if (stat(tree_current_access_path(t), &t->st) != 0)
#endif
return NULL;
t->flags |= hasStat;
}
return (&t->st);
}
/*
* Get the lstat() data for the entry just returned from tree_next().
*/
static const struct stat *
tree_current_lstat(struct tree *t)
{
if (!(t->flags & hasLstat)) {
#ifdef HAVE_FSTATAT
if (fstatat(tree_current_dir_fd(t),
tree_current_access_path(t), &t->lst,
AT_SYMLINK_NOFOLLOW) != 0)
#else
if (lstat(tree_current_access_path(t), &t->lst) != 0)
#endif
return NULL;
t->flags |= hasLstat;
}
return (&t->lst);
}
/*
* Test whether current entry is a dir or link to a dir.
*/
static int
tree_current_is_dir(struct tree *t)
{
const struct stat *st;
/*
* If we already have lstat() info, then try some
* cheap tests to determine if this is a dir.
*/
if (t->flags & hasLstat) {
/* If lstat() says it's a dir, it must be a dir. */
if (S_ISDIR(tree_current_lstat(t)->st_mode))
return 1;
/* Not a dir; might be a link to a dir. */
/* If it's not a link, then it's not a link to a dir. */
if (!S_ISLNK(tree_current_lstat(t)->st_mode))
return 0;
/*
* It's a link, but we don't know what it's a link to,
* so we'll have to use stat().
*/
}
st = tree_current_stat(t);
/* If we can't stat it, it's not a dir. */
if (st == NULL)
return 0;
/* Use the definitive test. Hopefully this is cached. */
return (S_ISDIR(st->st_mode));
}
/*
* Test whether current entry is a physical directory. Usually, we
* already have at least one of stat() or lstat() in memory, so we
* use tricks to try to avoid an extra trip to the disk.
*/
static int
tree_current_is_physical_dir(struct tree *t)
{
const struct stat *st;
/*
* If stat() says it isn't a dir, then it's not a dir.
* If stat() data is cached, this check is free, so do it first.
*/
if ((t->flags & hasStat)
&& (!S_ISDIR(tree_current_stat(t)->st_mode)))
return 0;
/*
* Either stat() said it was a dir (in which case, we have
* to determine whether it's really a link to a dir) or
* stat() info wasn't available. So we use lstat(), which
* hopefully is already cached.
*/
st = tree_current_lstat(t);
/* If we can't stat it, it's not a dir. */
if (st == NULL)
return 0;
/* Use the definitive test. Hopefully this is cached. */
return (S_ISDIR(st->st_mode));
}
/*
* Test whether the same file has been in the tree as its parent.
*/
static int
tree_target_is_same_as_parent(struct tree *t, const struct stat *st)
{
struct tree_entry *te;
for (te = t->current->parent; te != NULL; te = te->parent) {
if (te->dev == st->st_dev && te->ino == st->st_ino)
return (1);
}
return (0);
}
/*
* Test whether the current file is symbolic link target and
* on the other filesystem.
*/
static int
tree_current_is_symblic_link_target(struct tree *t)
{
static const struct stat *lst, *st;
lst = tree_current_lstat(t);
st = tree_current_stat(t);
return (st != NULL && st->st_dev == t->current_filesystem->dev &&
st->st_dev != lst->st_dev);
}
/*
* Return the access path for the entry just returned from tree_next().
*/
static const char *
tree_current_access_path(struct tree *t)
{
return (t->basename);
}
/*
* Return the full path for the entry just returned from tree_next().
*/
static const char *
tree_current_path(struct tree *t)
{
return (t->path.s);
}
/*
* Terminate the traversal.
*/
static void
tree_close(struct tree *t)
{
if (t == NULL)
return;
if (t->entry_fd >= 0) {
close_and_restore_time(t->entry_fd, t, &t->restore_time);
t->entry_fd = -1;
}
/* Close the handle of readdir(). */
if (t->d != INVALID_DIR_HANDLE) {
closedir(t->d);
t->d = INVALID_DIR_HANDLE;
}
/* Release anything remaining in the stack. */
while (t->stack != NULL) {
if (t->stack->flags & isDirLink)
close(t->stack->symlink_parent_fd);
tree_pop(t);
}
if (t->working_dir_fd >= 0) {
close(t->working_dir_fd);
t->working_dir_fd = -1;
}
if (t->initial_dir_fd >= 0) {
close(t->initial_dir_fd);
t->initial_dir_fd = -1;
}
}
/*
* Release any resources.
*/
static void
tree_free(struct tree *t)
{
int i;
if (t == NULL)
return;
archive_string_free(&t->path);
#if defined(HAVE_READDIR_R)
free(t->dirent);
#endif
free(t->sparse_list);
for (i = 0; i < t->max_filesystem_id; i++)
free(t->filesystem_table[i].allocation_ptr);
free(t->filesystem_table);
free(t);
}
#endif
Reference in New Issue View Git Blame Copy Permalink