/* Extract files from a tar archive.
Copyright (C) 1988, 1992, 1993, 1994, 1996, 1997, 1998, 1999, 2000,
- 2001, 2003, 2004, 2005, 2006, 2007 Free Software Foundation, Inc.
+ 2001, 2003, 2004, 2005, 2006, 2007, 2010 Free Software Foundation, Inc.
Written by John Gilmore, on 1985-11-19.
#include <system.h>
#include <quotearg.h>
-#include <utimens.h>
#include <errno.h>
-#include <xgetcwd.h>
#include <priv-set.h>
#include "common.h"
mode_t invert_permissions;
enum permstatus permstatus;
bool after_links;
+ int change_dir;
char file_name[1];
};
/* The next delayed link in the list. */
struct delayed_link *next;
- /* The device, inode number and last-modified time of the placeholder. */
+ /* The device, inode number and ctime of the placeholder. Use
+ ctime, not mtime, to make false matches less likely if some
+ other process removes the placeholder. */
dev_t dev;
ino_t ino;
- struct timespec mtime;
+ struct timespec ctime;
/* True if the link is symbolic. */
bool is_symlink;
uid_t uid;
gid_t gid;
+ /* The directory that the sources and target are relative to. */
+ int change_dir;
+
/* A list of sources for this link. The sources are all to be
hard-linked together. */
struct string_list *sources;
}
}
+/* Use fchmod if possible, chmod otherwise. */
+static int
+fdchmod (char const *file, int fd, mode_t mode)
+{
+#if HAVE_FCHMOD
+ if (0 <= fd)
+ return fchmod (fd, mode);
+#endif
+ return chmod (file, mode);
+}
+
+/* Use fchown if possible, chown otherwise. */
+static int
+fdchown (char const *file, int fd, uid_t uid, gid_t gid)
+{
+#if HAVE_FCHOWN
+ if (0 <= fd)
+ return fchown (fd, uid, gid);
+#endif
+ return chown (file, uid, gid);
+}
+
+/* Use fstat if possible, stat otherwise. */
+static int
+fdstat (char const *file, int fd, struct stat *st)
+{
+ if (0 <= fd)
+ return fstat (fd, st);
+ return stat (file, st);
+}
+
/* If restoring permissions, restore the mode for FILE_NAME from
- information given in *STAT_INFO (where *CUR_INFO gives
+ information given in *STAT_INFO (where FD is a file descriptor
+ for the file if FD is nonnegative, and where *CUR_INFO gives
the current status if CUR_INFO is nonzero); otherwise invert the
INVERT_PERMISSIONS bits from the file's current permissions.
PERMSTATUS specifies the status of the file's permissions.
static void
set_mode (char const *file_name,
struct stat const *stat_info,
- struct stat const *cur_info,
+ int fd, struct stat const *cur_info,
mode_t invert_permissions, enum permstatus permstatus,
char typeflag)
{
mode_t mode;
- bool failed;
-
+ int chmod_errno;
+
if (0 < same_permissions_option
&& permstatus != INTERDIR_PERMSTATUS)
{
struct stat st;
if (! cur_info)
{
- if (stat (file_name, &st) != 0)
+ if (fdstat (file_name, fd, &st) != 0)
{
stat_error (file_name);
return;
mode = cur_info->st_mode ^ invert_permissions;
}
- failed = chmod (file_name, mode) != 0;
- if (failed && errno == EPERM)
+ chmod_errno = fdchmod (file_name, fd, mode) == 0 ? 0 : errno;
+ if (chmod_errno == EPERM && (mode & S_ISUID) != 0)
{
- /* On Solaris, chmod may fail if we don't have PRIV_ALL. */
+ /* On Solaris, chmod may fail if we don't have PRIV_ALL, because
+ setuid-root files would otherwise be a backdoor. See
+ http://opensolaris.org/jive/thread.jspa?threadID=95826
+ (2009-09-03). */
if (priv_set_restore_linkdir () == 0)
{
- failed = chmod (file_name, mode) != 0;
+ chmod_errno = fdchmod (file_name, fd, mode) == 0 ? 0 : errno;
priv_set_remove_linkdir ();
}
}
- if (failed)
- chmod_error_details (file_name, mode);
+ if (chmod_errno)
+ {
+ errno = chmod_errno;
+ chmod_error_details (file_name, mode);
+ }
}
/* Check time after successfully setting FILE_NAME's time stamp to T. */
check_time (char const *file_name, struct timespec t)
{
if (t.tv_sec <= 0)
- WARN ((0, 0, _("%s: implausibly old time stamp %s"),
- file_name, tartime (t, true)));
+ WARNOPT (WARN_TIMESTAMP,
+ (0, 0, _("%s: implausibly old time stamp %s"),
+ file_name, tartime (t, true)));
else if (timespec_cmp (volume_start_time, t) < 0)
{
struct timespec now;
diff.tv_nsec += BILLION;
diff.tv_sec--;
}
- WARN ((0, 0, _("%s: time stamp %s is %s s in the future"),
- file_name, tartime (t, true), code_timespec (diff, buf)));
+ WARNOPT (WARN_TIMESTAMP,
+ (0, 0, _("%s: time stamp %s is %s s in the future"),
+ file_name, tartime (t, true), code_timespec (diff, buf)));
}
}
}
/* Restore stat attributes (owner, group, mode and times) for
FILE_NAME, using information given in *ST.
+ If FD is nonnegative, it is a file descriptor for the file.
If CUR_INFO is nonzero, *CUR_INFO is the
file's current status.
If not restoring permissions, invert the
static void
set_stat (char const *file_name,
struct tar_stat_info const *st,
- struct stat const *cur_info,
+ int fd, struct stat const *cur_info,
mode_t invert_permissions, enum permstatus permstatus,
char typeflag)
{
if (! touch_option && permstatus != INTERDIR_PERMSTATUS)
{
- /* We set the accessed time to `now', which is really the time we
- started extracting files, unless incremental_option is used, in
- which case .st_atime is used. */
-
- /* FIXME: incremental_option should set ctime too, but how? */
-
struct timespec ts[2];
if (incremental_option)
ts[0] = st->atime;
else
- ts[0] = start_time;
+ ts[0].tv_nsec = UTIME_NOW;
ts[1] = st->mtime;
- if (utimens (file_name, ts) != 0)
+ if (fd_utimensat (fd, AT_FDCWD, file_name, ts, 0) != 0)
utime_error (file_name);
else
{
- check_time (file_name, ts[0]);
+ if (incremental_option)
+ check_time (file_name, ts[0]);
check_time (file_name, ts[1]);
}
}
}
else
{
- chown_result = chown (file_name, st->stat.st_uid, st->stat.st_gid);
+ chown_result = fdchown (file_name, fd,
+ st->stat.st_uid, st->stat.st_gid);
}
if (chown_result == 0)
}
if (typeflag != SYMTYPE)
- set_mode (file_name, &st->stat, cur_info,
+ set_mode (file_name, &st->stat, fd, cur_info,
invert_permissions, permstatus, typeflag);
}
data->invert_permissions = invert_permissions;
data->permstatus = permstatus;
data->after_links = 0;
+ data->change_dir = chdir_current;
strcpy (data->file_name, file_name);
delayed_set_stat_head = data;
}
properly restored on returning RECOVER_NO. */
static int
-maybe_recoverable (char *file_name, int *interdir_made)
+maybe_recoverable (char *file_name, bool *interdir_made)
{
int e = errno;
errno = ENOENT;
return RECOVER_NO;
}
- *interdir_made = 1;
+ *interdir_made = true;
return RECOVER_OK;
default:
&& memcmp (file_name, data->file_name, data->file_name_len) == 0))
break;
+ chdir_do (data->change_dir);
+
if (check_for_renamed_directories)
{
cur_info = &st;
sb.stat.st_gid = data->gid;
sb.atime = data->atime;
sb.mtime = data->mtime;
- set_stat (data->file_name, &sb, cur_info,
+ set_stat (data->file_name, &sb, -1, cur_info,
data->invert_permissions, data->permstatus, DIRTYPE);
}
{
int status;
mode_t mode;
- int interdir_made = 0;
+ bool interdir_made = false;
/* Save 'root device' to avoid purging mount points. */
if (one_file_system_option && root_device == 0)
{
struct stat st;
- char *dir = xgetcwd ();
- if (deref_stat (true, dir, &st))
- stat_diag (dir);
+ if (stat (".", &st) != 0)
+ stat_diag (".");
else
root_device = st.st_dev;
- free (dir);
}
if (incremental_option)
if (!conttype_diagnosed)
{
conttype_diagnosed = 1;
- WARN ((0, 0, _("Extracting contiguous files as regular files")));
+ WARNOPT (WARN_CONTIGUOUS_CAST,
+ (0, 0, _("Extracting contiguous files as regular files")));
}
}
fd = open (file_name, openflag, mode);
int status;
size_t count;
size_t written;
- int interdir_made = 0;
+ bool interdir_made = false;
mode_t mode = current_stat_info.stat.st_mode & MODE_RWX & ~ current_umask;
mode_t invert_permissions =
0 < same_owner_option ? mode & (S_IRWXG | S_IRWXO) : 0;
}
}
- mv_begin (¤t_stat_info);
+ mv_begin_read (¤t_stat_info);
if (current_stat_info.is_sparse)
sparse_extract_file (fd, ¤t_stat_info, &size);
else
if (to_stdout_option)
return 0;
+ if (! to_command_option)
+ set_stat (file_name, ¤t_stat_info, fd, NULL, invert_permissions,
+ (old_files_option == OVERWRITE_OLD_FILES
+ ? UNKNOWN_PERMSTATUS : ARCHIVED_PERMSTATUS),
+ typeflag);
+
status = close (fd);
if (status < 0)
close_error (file_name);
if (to_command_option)
sys_wait_command ();
- else
- set_stat (file_name, ¤t_stat_info, NULL, invert_permissions,
- (old_files_option == OVERWRITE_OLD_FILES ?
- UNKNOWN_PERMSTATUS : ARCHIVED_PERMSTATUS),
- typeflag);
return status;
}
process. */
static int
-create_placeholder_file (char *file_name, bool is_symlink, int *interdir_made)
+create_placeholder_file (char *file_name, bool is_symlink, bool *interdir_made)
{
int fd;
struct stat st;
while ((fd = open (file_name, O_WRONLY | O_CREAT | O_EXCL, 0)) < 0)
- if (! maybe_recoverable (file_name, interdir_made))
- break;
+ {
+ switch (maybe_recoverable (file_name, interdir_made))
+ {
+ case RECOVER_OK:
+ continue;
- if (fd < 0)
- open_error (file_name);
- else if (fstat (fd, &st) != 0)
+ case RECOVER_SKIP:
+ return 0;
+
+ case RECOVER_NO:
+ open_error (file_name);
+ return -1;
+ }
+ }
+
+ if (fstat (fd, &st) != 0)
{
stat_error (file_name);
close (fd);
delayed_link_head = p;
p->dev = st.st_dev;
p->ino = st.st_ino;
- p->mtime = get_stat_mtime (&st);
+ p->ctime = get_stat_ctime (&st);
p->is_symlink = is_symlink;
if (is_symlink)
{
p->uid = current_stat_info.stat.st_uid;
p->gid = current_stat_info.stat.st_gid;
}
+ p->change_dir = chdir_current;
p->sources = xmalloc (offsetof (struct string_list, string)
+ strlen (file_name) + 1);
p->sources->next = 0;
static int
extract_link (char *file_name, int typeflag)
{
- int interdir_made = 0;
+ bool interdir_made = false;
char const *link_name;
+ int rc;
link_name = current_stat_info.link_name;
-
+
if (! absolute_names_option && contains_dot_dot (link_name))
return create_placeholder_file (file_name, false, &interdir_made);
struct delayed_link *ds = delayed_link_head;
if (ds && lstat (link_name, &st1) == 0)
for (; ds; ds = ds->next)
- if (ds->dev == st1.st_dev
+ if (ds->change_dir == chdir_current
+ && ds->dev == st1.st_dev
&& ds->ino == st1.st_ino
- && timespec_cmp (ds->mtime, get_stat_mtime (&st1)) == 0)
+ && timespec_cmp (ds->ctime, get_stat_ctime (&st1)) == 0)
{
struct string_list *p = xmalloc (offsetof (struct string_list, string)
+ strlen (file_name) + 1);
errno = e;
}
- while (maybe_recoverable (file_name, &interdir_made));
+ while ((rc = maybe_recoverable (file_name, &interdir_made)) == RECOVER_OK);
+ if (rc == RECOVER_SKIP)
+ return 0;
if (!(incremental_option && errno == EEXIST))
{
link_error (link_name, file_name);
extract_symlink (char *file_name, int typeflag)
{
#ifdef HAVE_SYMLINK
- int status;
- int interdir_made = 0;
+ bool interdir_made = false;
if (! absolute_names_option
&& (IS_ABSOLUTE_FILE_NAME (current_stat_info.link_name)
|| contains_dot_dot (current_stat_info.link_name)))
return create_placeholder_file (file_name, true, &interdir_made);
- while ((status = symlink (current_stat_info.link_name, file_name)))
- if (!maybe_recoverable (file_name, &interdir_made))
- break;
+ while (symlink (current_stat_info.link_name, file_name))
+ switch (maybe_recoverable (file_name, &interdir_made))
+ {
+ case RECOVER_OK:
+ continue;
- if (status == 0)
- set_stat (file_name, ¤t_stat_info, NULL, 0, 0, SYMTYPE);
- else
- symlink_error (current_stat_info.link_name, file_name);
- return status;
+ case RECOVER_SKIP:
+ return 0;
+
+ case RECOVER_NO:
+ symlink_error (current_stat_info.link_name, file_name);
+ return -1;
+ }
+
+ set_stat (file_name, ¤t_stat_info, -1, NULL, 0, 0, SYMTYPE);
+ return 0;
#else
static int warned_once;
if (!warned_once)
{
warned_once = 1;
- WARN ((0, 0, _("Attempting extraction of symbolic links as hard links")));
+ WARNOPT (WARN_SYMBOLIC_CAST,
+ (0, 0,
+ _("Attempting extraction of symbolic links as hard links")));
}
return extract_link (file_name, typeflag);
#endif
static int
extract_node (char *file_name, int typeflag)
{
- int status;
- int interdir_made = 0;
+ bool interdir_made = false;
mode_t mode = current_stat_info.stat.st_mode & ~ current_umask;
mode_t invert_permissions =
0 < same_owner_option ? mode & (S_IRWXG | S_IRWXO) : 0;
- do
- status = mknod (file_name, mode ^ invert_permissions,
- current_stat_info.stat.st_rdev);
- while (status && maybe_recoverable (file_name, &interdir_made));
+ while (mknod (file_name, mode ^ invert_permissions,
+ current_stat_info.stat.st_rdev))
+ switch (maybe_recoverable (file_name, &interdir_made))
+ {
+ case RECOVER_OK:
+ continue;
- if (status != 0)
- mknod_error (file_name);
- else
- set_stat (file_name, ¤t_stat_info, NULL, invert_permissions,
- ARCHIVED_PERMSTATUS, typeflag);
- return status;
+ case RECOVER_SKIP:
+ return 0;
+
+ case RECOVER_NO:
+ mknod_error (file_name);
+ return -1;
+ }
+
+ set_stat (file_name, ¤t_stat_info, -1, NULL, invert_permissions,
+ ARCHIVED_PERMSTATUS, typeflag);
+ return 0;
}
#endif
extract_fifo (char *file_name, int typeflag)
{
int status;
- int interdir_made = 0;
+ bool interdir_made = false;
mode_t mode = current_stat_info.stat.st_mode & ~ current_umask;
mode_t invert_permissions =
0 < same_owner_option ? mode & (S_IRWXG | S_IRWXO) : 0;
while ((status = mkfifo (file_name, mode)) != 0)
- if (!maybe_recoverable (file_name, &interdir_made))
- break;
+ switch (maybe_recoverable (file_name, &interdir_made))
+ {
+ case RECOVER_OK:
+ continue;
- if (status == 0)
- set_stat (file_name, ¤t_stat_info, NULL, invert_permissions,
- ARCHIVED_PERMSTATUS, typeflag);
- else
- mkfifo_error (file_name);
- return status;
+ case RECOVER_SKIP:
+ return 0;
+
+ case RECOVER_NO:
+ mkfifo_error (file_name);
+ return -1;
+ }
+
+ set_stat (file_name, ¤t_stat_info, -1, NULL, invert_permissions,
+ ARCHIVED_PERMSTATUS, typeflag);
+ return 0;
}
#endif
static int
extract_volhdr (char *file_name, int typeflag)
{
- if (verbose_option)
- fprintf (stdlis, _("Reading %s\n"), quote (current_stat_info.file_name));
skip_member ();
return 0;
}
break;
default:
- WARN ((0, 0,
- _("%s: Unknown file type `%c', extracted as normal file"),
- quotearg_colon (file_name), typeflag));
+ WARNOPT (WARN_UNKNOWN_CAST,
+ (0, 0,
+ _("%s: Unknown file type `%c', extracted as normal file"),
+ quotearg_colon (file_name), typeflag));
*fun = extract_file;
}
case KEEP_NEWER_FILES:
if (file_newer_p (file_name, ¤t_stat_info))
{
- WARN ((0, 0, _("Current %s is newer or same age"),
- quote (file_name)));
+ WARNOPT (WARN_IGNORE_NEWER,
+ (0, 0, _("Current %s is newer or same age"),
+ quote (file_name)));
return 0;
}
break;
char typeflag;
tar_extractor_t fun;
- /* Try to disable the ability to unlink a directory. */
- priv_set_remove_linkdir ();
+ fatal_exit_hook = extract_finish;
set_next_block_after (current_header);
- decode_header (current_header, ¤t_stat_info, ¤t_format, 1);
+
if (!current_stat_info.file_name[0]
|| (interactive_option
&& !confirm ("extract", current_stat_info.file_name)))
/* Print the block from current_header and current_stat. */
if (verbose_option)
- print_header (¤t_stat_info, -1);
+ print_header (¤t_stat_info, current_header, -1);
/* Restore stats for all non-ancestor directories, unless
it is an incremental archive.
(see NOTICE in the comment to delay_set_stat above) */
if (!delay_directory_restore_option)
- apply_nonancestor_delayed_set_stat (current_stat_info.file_name, 0);
+ {
+ int dir = chdir_current;
+ apply_nonancestor_delayed_set_stat (current_stat_info.file_name, 0);
+ chdir_do (dir);
+ }
/* Take a safety backup of a previously existing file. */
}
-/* Extract the symbolic links whose final extraction were delayed. */
+/* Extract the links whose final extraction were delayed. */
static void
apply_delayed_links (void)
{
struct string_list *sources = ds->sources;
char const *valid_source = 0;
+ chdir_do (ds->change_dir);
+
for (sources = ds->sources; sources; sources = sources->next)
{
char const *source = sources->string;
if (lstat (source, &st) == 0
&& st.st_dev == ds->dev
&& st.st_ino == ds->ino
- && timespec_cmp (get_stat_mtime (&st), ds->mtime) == 0)
+ && timespec_cmp (get_stat_ctime (&st), ds->ctime) == 0)
{
/* Unlink the placeholder, then create a hard link if possible,
a symbolic link otherwise. */
struct tar_stat_info st1;
st1.stat.st_uid = ds->uid;
st1.stat.st_gid = ds->gid;
- set_stat (source, &st1, NULL, 0, 0, SYMTYPE);
+ set_stat (source, &st1, -1, NULL, 0, 0, SYMTYPE);
valid_source = source;
}
}
}
return true;
}
-
-void
-fatal_exit (void)
-{
- extract_finish ();
- error (TAREXIT_FAILURE, 0, _("Error is not recoverable: exiting now"));
- abort ();
-}
-
-void
-xalloc_die (void)
-{
- error (0, 0, "%s", _("memory exhausted"));
- fatal_exit ();
-}
projects / chaz / tar / blobdiff