/****************************************************************************
Create a directory given an absolute path, perms based upon another directory
path
****************************************************************************/
int make_bak_dir(const char *fullpath)
{
char fbuf[MAXPATHLEN], *rel, *end, *p;
struct file_struct *file;
int len = backup_dir_len;
stat_x sx;
while (*fullpath == '.' && fullpath[1] == '/') {
fullpath += 2;
len -= 2;
}
if (strlcpy(fbuf, fullpath, sizeof fbuf) >= sizeof fbuf)
return -1;
rel = fbuf + len;
end = p = rel + strlen(rel);
/* Try to find an existing dir, starting from the deepest dir. */
while (1) {
if (--p == fbuf)
return -1;
if (*p == '/') {
*p = '\0';
if (mkdir_defmode(fbuf) == 0)
break;
if (errno != ENOENT) {
rsyserr(FERROR, errno,
"make_bak_dir mkdir %s failed",
full_fname(fbuf));
return -1;
}
}
}
/* Make all the dirs that we didn't find on the way here. */
while (1) {
if (p >= rel) {
/* Try to transfer the directory settings of the
* actual dir that the files are coming from. */
if (x_stat(rel, &sx.st, NULL) < 0) {
rsyserr(FERROR, errno,
"make_bak_dir stat %s failed",
full_fname(rel));
} else {
#ifdef SUPPORT_ACLS
sx.acc_acl = sx.def_acl = NULL;
#endif
#ifdef SUPPORT_XATTRS
sx.xattr = NULL;
#endif
if (!(file = make_file(rel, NULL, NULL, 0, NO_FILTERS)))
continue;
#ifdef SUPPORT_ACLS
if (preserve_acls && !S_ISLNK(file->mode)) {
get_acl(rel, &sx);
cache_tmp_acl(file, &sx);
free_acl(&sx);
}
#endif
#ifdef SUPPORT_XATTRS
if (preserve_xattrs) {
get_xattr(rel, &sx);
cache_tmp_xattr(file, &sx);
free_xattr(&sx);
}
#endif
set_file_attrs(fbuf, file, NULL, NULL, 0);
unmake_file(file);
#ifdef SUPPORT_ACLS
uncache_tmp_acls();
#endif
#ifdef SUPPORT_XATTRS
uncache_tmp_xattrs();
#endif
}
}
*p = '/';
p += strlen(p);
if (p == end)
break;
if (mkdir_defmode(fbuf) < 0) {
rsyserr(FERROR, errno, "make_bak_dir mkdir %s failed",
full_fname(fbuf));
return -1;
}
}
return 0;
}
/* If we have a --backup-dir, then we get here from make_backup().
* We will move the file to be deleted into a parallel directory tree. */
static int keep_backup(const char *fname)
{
stat_x sx;
struct file_struct *file;
char *buf;
int save_preserve_xattrs = preserve_xattrs;
int kept = 0;
int ret_code;
/* return if no file to keep */
if (x_lstat(fname, &sx.st, NULL) < 0)
return 1;
#ifdef SUPPORT_ACLS
sx.acc_acl = sx.def_acl = NULL;
#endif
#ifdef SUPPORT_XATTRS
sx.xattr = NULL;
#endif
if (!(file = make_file(fname, NULL, NULL, 0, NO_FILTERS)))
return 1; /* the file could have disappeared */
if (!(buf = get_backup_name(fname))) {
unmake_file(file);
#ifdef SUPPORT_ACLS
uncache_tmp_acls();
#endif
#ifdef SUPPORT_XATTRS
uncache_tmp_xattrs();
#endif
return 0;
}
#ifdef SUPPORT_ACLS
if (preserve_acls && !S_ISLNK(file->mode)) {
get_acl(fname, &sx);
cache_tmp_acl(file, &sx);
free_acl(&sx);
}
#endif
#ifdef SUPPORT_XATTRS
if (preserve_xattrs) {
get_xattr(fname, &sx);
cache_tmp_xattr(file, &sx);
free_xattr(&sx);
}
#endif
/* Check to see if this is a device file, or link */
if ((am_root && preserve_devices && IS_DEVICE(file->mode))
|| (preserve_specials && IS_SPECIAL(file->mode))) {
int save_errno;
do_unlink(buf);
if (do_mknod(buf, file->mode, sx.st.st_rdev) < 0) {
save_errno = errno ? errno : EINVAL; /* 0 paranoia */
if (errno == ENOENT && make_bak_dir(buf) == 0) {
if (do_mknod(buf, file->mode, sx.st.st_rdev) < 0)
save_errno = errno ? errno : save_errno;
else
save_errno = 0;
}
if (save_errno) {
rsyserr(FERROR, save_errno, "mknod %s failed",
full_fname(buf));
}
} else
save_errno = 0;
if (verbose > 2 && save_errno == 0) {
rprintf(FINFO, "make_backup: DEVICE %s successful.\n",
fname);
}
kept = 1;
do_unlink(fname);
}
if (!kept && S_ISDIR(file->mode)) {
/* make an empty directory */
if (do_mkdir(buf, file->mode) < 0) {
int save_errno = errno ? errno : EINVAL; /* 0 paranoia */
if (errno == ENOENT && make_bak_dir(buf) == 0) {
if (do_mkdir(buf, file->mode) < 0)
save_errno = errno ? errno : save_errno;
else
save_errno = 0;
}
if (save_errno) {
rsyserr(FINFO, save_errno, "mkdir %s failed",
full_fname(buf));
}
}
ret_code = do_rmdir(fname);
if (verbose > 2) {
rprintf(FINFO, "make_backup: RMDIR %s returns %i\n",
full_fname(fname), ret_code);
}
kept = 1;
}
#ifdef SUPPORT_LINKS
if (!kept && preserve_links && S_ISLNK(file->mode)) {
const char *sl = F_SYMLINK(file);
if (safe_symlinks && unsafe_symlink(sl, fname)) {
if (verbose) {
rprintf(FINFO, "ignoring unsafe symlink %s -> %s\n",
full_fname(buf), sl);
}
kept = 1;
} else {
do_unlink(buf);
if (do_symlink(sl, buf) < 0) {
int save_errno = errno ? errno : EINVAL; /* 0 paranoia */
if (errno == ENOENT && make_bak_dir(buf) == 0) {
if (do_symlink(sl, buf) < 0)
save_errno = errno ? errno : save_errno;
else
save_errno = 0;
}
if (save_errno) {
rsyserr(FERROR, save_errno, "link %s -> \"%s\"",
full_fname(buf), sl);
}
}
do_unlink(fname);
kept = 1;
}
}
#endif
if (!kept && !S_ISREG(file->mode)) {
rprintf(FINFO, "make_bak: skipping non-regular file %s\n",
fname);
unmake_file(file);
#ifdef SUPPORT_ACLS
uncache_tmp_acls();
#endif
#ifdef SUPPORT_XATTRS
uncache_tmp_xattrs();
#endif
return 1;
}
/* move to keep tree if a file */
if (!kept) {
if (robust_move(fname, buf) != 0) {
rsyserr(FERROR, errno, "keep_backup failed: %s -> \"%s\"",
full_fname(fname), buf);
} else if (sx.st.st_nlink > 1) {
/* If someone has hard-linked the file into the backup
* dir, rename() might return success but do nothing! */
robust_unlink(fname); /* Just in case... */
}
}
preserve_xattrs = 0;
set_file_attrs(buf, file, NULL, fname, 0);
preserve_xattrs = save_preserve_xattrs;
unmake_file(file);
#ifdef SUPPORT_ACLS
uncache_tmp_acls();
#endif
#ifdef SUPPORT_XATTRS
uncache_tmp_xattrs();
#endif
if (verbose > 1) {
rprintf(FINFO, "backed up %s to %s\n",
fname, buf);
}
return 1;
}
/* Create a backup path from the given fname, putting the result into
* backup_dir_buf. Any new directories (compared to the prior backup
* path) are ensured to exist as directories, replacing anything else
* that may be in the way (e.g. a symlink). */
static BOOL copy_valid_path(const char *fname)
{
const char *f;
int val;
BOOL ret = True;
stat_x sx;
char *b, *rel = backup_dir_buf + backup_dir_len, *name = rel;
for (f = fname, b = rel; *f && *f == *b; f++, b++) {
if (*b == '/')
name = b + 1;
}
if (stringjoin(rel, backup_dir_remainder, fname, backup_suffix, NULL) >= backup_dir_remainder) {
rprintf(FERROR, "backup filename too long\n");
*name = '\0';
return False;
}
for ( ; ; name = b + 1) {
if ((b = strchr(name, '/')) == NULL)
return True;
*b = '\0';
val = validate_backup_dir();
if (val == 0)
break;
if (val < 0) {
*name = '\0';
return False;
}
*b = '/';
}
init_stat_x(&sx);
for ( ; b; name = b + 1, b = strchr(name, '/')) {
*b = '\0';
while (do_mkdir(backup_dir_buf, ACCESSPERMS) < 0) {
if (errno == EEXIST) {
val = validate_backup_dir();
if (val > 0)
break;
if (val == 0)
continue;
} else
rsyserr(FERROR, errno, "backup mkdir %s failed", backup_dir_buf);
*name = '\0';
ret = False;
goto cleanup;
}
/* Try to transfer the directory settings of the actual dir
* that the files are coming from. */
if (x_stat(rel, &sx.st, NULL) < 0)
rsyserr(FERROR, errno, "backup stat %s failed", full_fname(rel));
else {
struct file_struct *file;
if (!(file = make_file(rel, NULL, NULL, 0, NO_FILTERS)))
continue;
#ifdef SUPPORT_ACLS
if (preserve_acls && !S_ISLNK(file->mode)) {
get_acl(rel, &sx);
cache_tmp_acl(file, &sx);
free_acl(&sx);
}
#endif
#ifdef SUPPORT_XATTRS
if (preserve_xattrs) {
get_xattr(rel, &sx);
cache_tmp_xattr(file, &sx);
free_xattr(&sx);
}
#endif
set_file_attrs(backup_dir_buf, file, NULL, NULL, 0);
unmake_file(file);
}
*b = '/';
}
cleanup:
#ifdef SUPPORT_ACLS
uncache_tmp_acls();
#endif
#ifdef SUPPORT_XATTRS
uncache_tmp_xattrs();
#endif
return ret;
}
/*
* Construct and return the list of xattr name:value pairs for the passed xattr
* id
*
* There are two users for get_xattr(), Mksquashfs uses it to read the
* xattrs from the filesystem on appending, and Unsquashfs uses it
* to retrieve the xattrs for writing to disk.
*
* Unfortunately, the two users disagree on what to do with unknown
* xattr prefixes, Mksquashfs wants to treat this as fatal otherwise
* this will cause xattrs to be be lost on appending. Unsquashfs
* on the otherhand wants to retrieve the xattrs which are known and
* to ignore the rest, this allows Unsquashfs to cope more gracefully
* with future versions which may have unknown xattrs, as long as the
* general xattr structure is adhered to, Unsquashfs should be able
* to safely ignore unknown xattrs, and to write the ones it knows about,
* this is better than completely refusing to retrieve all the xattrs.
*
* If ignore is TRUE then don't treat unknown xattr prefixes as
* a failure to read the xattr.
*/
struct xattr_list *get_xattr(int i, unsigned int *count, int ignore) {
long long start;
struct xattr_list *xattr_list = NULL;
unsigned int offset;
void *xptr;
int j = 0, res = 1;
TRACE("get_xattr\n");
*count = xattr_ids[i].count;
start = SQUASHFS_XATTR_BLK(xattr_ids[i].xattr) + xattr_table_start;
offset = SQUASHFS_XATTR_OFFSET(xattr_ids[i].xattr);
xptr = xattrs + get_xattr_block(start) + offset;
TRACE("get_xattr: xattr_id %d, count %d, start %lld, offset %d\n", i, *count, start, offset);
while (j < *count) {
struct squashfs_xattr_entry entry;
struct squashfs_xattr_val val;
if (res != 0) {
xattr_list = realloc(xattr_list, (j + 1) * sizeof(struct xattr_list));
if (xattr_list == NULL)
MEM_ERROR();
}
SQUASHFS_SWAP_XATTR_ENTRY(xptr, &entry);
xptr += sizeof(entry);
res = read_xattr_entry(&xattr_list[j], &entry, xptr);
if (ignore && res == 0) {
/* unknown prefix, but ignore flag is set */
(*count)--;
continue;
}
if (res != 1)
goto failed;
xptr += entry.size;
TRACE("get_xattr: xattr %d, type %d, size %d, name %s\n", j, entry.type, entry.size, xattr_list[j].full_name);
if (entry.type & SQUASHFS_XATTR_VALUE_OOL) {
long long xattr;
void *ool_xptr;
xptr += sizeof(val);
SQUASHFS_SWAP_LONG_LONGS(xptr, &xattr, 1);
xptr += sizeof(xattr);
start = SQUASHFS_XATTR_BLK(xattr) + xattr_table_start;
offset = SQUASHFS_XATTR_OFFSET(xattr);
ool_xptr = xattrs + get_xattr_block(start) + offset;
SQUASHFS_SWAP_XATTR_VAL(ool_xptr, &val);
xattr_list[j].value = ool_xptr + sizeof(val);
} else {
SQUASHFS_SWAP_XATTR_VAL(xptr, &val);
xattr_list[j].value = xptr + sizeof(val);
xptr += sizeof(val) + val.vsize;
}
TRACE("get_xattr: xattr %d, vsize %d\n", j, val.vsize);
xattr_list[j++].vsize = val.vsize;
}
if (*count == 0)
goto failed;
return xattr_list;
failed:
free_xattr(xattr_list, j);
return NULL;
}
/* Hard-link, rename, or copy an item to the backup name. Returns 0 for
* failure, 1 if item was moved, 2 if item was duplicated or hard linked
* into backup area, or 3 if item doesn't exist or isn't a regular file. */
int make_backup(const char *fname, BOOL prefer_rename)
{
stat_x sx;
struct file_struct *file;
int save_preserve_xattrs;
char *buf;
int ret = 0;
init_stat_x(&sx);
/* Return success if no file to keep. */
if (x_lstat(fname, &sx.st, NULL) < 0)
return 3;
if (!(buf = get_backup_name(fname)))
return 0;
/* Try a hard-link or a rename first. Using rename is not atomic, but
* is more efficient than forcing a copy for larger files when no hard-
* linking is possible. */
if ((ret = link_or_rename(fname, buf, prefer_rename, &sx.st)) != 0)
goto success;
if (errno == EEXIST || errno == EISDIR) {
STRUCT_STAT bakst;
if (do_lstat(buf, &bakst) == 0) {
int flags = get_del_for_flag(bakst.st_mode) | DEL_FOR_BACKUP | DEL_RECURSE;
if (delete_item(buf, bakst.st_mode, flags) != 0)
return 0;
}
if ((ret = link_or_rename(fname, buf, prefer_rename, &sx.st)) != 0)
goto success;
}
/* Fall back to making a copy. */
if (!(file = make_file(fname, NULL, &sx.st, 0, NO_FILTERS)))
return 3; /* the file could have disappeared */
#ifdef SUPPORT_ACLS
if (preserve_acls && !S_ISLNK(file->mode)) {
get_acl(fname, &sx);
cache_tmp_acl(file, &sx);
free_acl(&sx);
}
#endif
#ifdef SUPPORT_XATTRS
if (preserve_xattrs) {
get_xattr(fname, &sx);
cache_tmp_xattr(file, &sx);
free_xattr(&sx);
}
#endif
/* Check to see if this is a device file, or link */
if ((am_root && preserve_devices && IS_DEVICE(file->mode))
|| (preserve_specials && IS_SPECIAL(file->mode))) {
if (do_mknod(buf, file->mode, sx.st.st_rdev) < 0)
rsyserr(FERROR, errno, "mknod %s failed", full_fname(buf));
else if (DEBUG_GTE(BACKUP, 1))
rprintf(FINFO, "make_backup: DEVICE %s successful.\n", fname);
ret = 2;
}
#ifdef SUPPORT_LINKS
if (!ret && preserve_links && S_ISLNK(file->mode)) {
const char *sl = F_SYMLINK(file);
if (safe_symlinks && unsafe_symlink(sl, fname)) {
if (INFO_GTE(SYMSAFE, 1)) {
rprintf(FINFO, "not backing up unsafe symlink \"%s\" -> \"%s\"\n",
fname, sl);
}
ret = 2;
} else {
if (do_symlink(sl, buf) < 0)
rsyserr(FERROR, errno, "link %s -> \"%s\"", full_fname(buf), sl);
else if (DEBUG_GTE(BACKUP, 1))
rprintf(FINFO, "make_backup: SYMLINK %s successful.\n", fname);
ret = 2;
}
}
#endif
if (!ret && !S_ISREG(file->mode)) {
rprintf(FINFO, "make_bak: skipping non-regular file %s\n", fname);
unmake_file(file);
#ifdef SUPPORT_ACLS
uncache_tmp_acls();
#endif
#ifdef SUPPORT_XATTRS
uncache_tmp_xattrs();
#endif
return 3;
}
/* Copy to backup tree if a file. */
if (!ret) {
if (copy_file(fname, buf, -1, file->mode) < 0) {
rsyserr(FERROR, errno, "keep_backup failed: %s -> \"%s\"",
full_fname(fname), buf);
unmake_file(file);
#ifdef SUPPORT_ACLS
uncache_tmp_acls();
#endif
#ifdef SUPPORT_XATTRS
uncache_tmp_xattrs();
#endif
return 0;
}
if (DEBUG_GTE(BACKUP, 1))
rprintf(FINFO, "make_backup: COPY %s successful.\n", fname);
ret = 2;
}
save_preserve_xattrs = preserve_xattrs;
preserve_xattrs = 0;
set_file_attrs(buf, file, NULL, fname, ATTRS_SET_NANO);
preserve_xattrs = save_preserve_xattrs;
unmake_file(file);
#ifdef SUPPORT_ACLS
uncache_tmp_acls();
#endif
#ifdef SUPPORT_XATTRS
uncache_tmp_xattrs();
#endif
success:
if (INFO_GTE(BACKUP, 1))
rprintf(FINFO, "backed up %s to %s\n", fname, buf);
return ret;
}
