/* Ditto as above. */
static int
mount_local_listxattr (const char *path, char *list, size_t size)
{
DECL_G ();
DEBUG_CALL ("%s, %p, %zu", path, list, size);
const struct guestfs_xattr_list *xattrs;
int free_attrs = 0;
xattrs = xac_lookup (g, path);
if (xattrs == NULL) {
xattrs = guestfs_lgetxattrs (g, path);
if (xattrs == NULL)
RETURN_ERRNO;
free_attrs = 1;
}
/* Calculate how much space is required to hold the result. */
size_t space = 0;
size_t len;
size_t i;
for (i = 0; i < xattrs->len; ++i) {
len = strlen (xattrs->val[i].attrname) + 1;
space += len;
}
/* The listxattr man page is unclear, but if list == NULL then we
* return the space required (the caller then makes a second syscall
* after allocating the required amount of space). If list != NULL
* then it's not clear what we should do, but it appears we should
* copy as much as possible and return -ERANGE if there's not enough
* space in the buffer.
*/
ssize_t r;
if (list == NULL) {
r = space;
goto out;
}
r = 0;
for (i = 0; i < xattrs->len; ++i) {
len = strlen (xattrs->val[i].attrname) + 1;
if (size >= len) {
memcpy (list, xattrs->val[i].attrname, len);
size -= len;
list += len;
r += len;
} else {
r = -ERANGE;
break;
}
}
out:
if (free_attrs)
guestfs_free_xattr_list ((struct guestfs_xattr_list *) xattrs);
return r;
}
/* The guestfs(3) API for getting xattrs is much easier to use
* than the real syscall. Unfortunately we now have to emulate
* the real syscall using that API :-(
*/
static int
mount_local_getxattr (const char *path, const char *name, char *value,
size_t size)
{
DECL_G ();
DEBUG_CALL ("%s, %s, %p, %zu", path, name, value, size);
const struct guestfs_xattr_list *xattrs;
int free_attrs = 0;
xattrs = xac_lookup (g, path);
if (xattrs == NULL) {
xattrs = guestfs_lgetxattrs (g, path);
if (xattrs == NULL)
RETURN_ERRNO;
free_attrs = 1;
}
/* Find the matching attribute (index in 'i'). */
ssize_t r;
size_t i;
for (i = 0; i < xattrs->len; ++i) {
if (STREQ (xattrs->val[i].attrname, name))
break;
}
if (i == xattrs->len) { /* not found */
r = -ENOATTR;
goto out;
}
/* The getxattr man page is unclear, but if value == NULL then we
* return the space required (the caller then makes a second syscall
* after allocating the required amount of space). If value != NULL
* then it's not clear what we should do, but it appears we should
* copy as much as possible and return -ERANGE if there's not enough
* space in the buffer.
*/
size_t sz = xattrs->val[i].attrval_len;
if (value == NULL) {
r = sz;
goto out;
}
if (sz <= size)
r = sz;
else {
r = -ERANGE;
sz = size;
}
memcpy (value, xattrs->val[i].attrval, sz);
out:
if (free_attrs)
guestfs_free_xattr_list ((struct guestfs_xattr_list *) xattrs);
return r;
}
static void
xac_free (void *x)
{
if (x) {
struct xac_entry *p = x;
guestfs_free_xattr_list (p->xattrs);
lsc_free (x);
}
}
static void
free_tree (struct tree *t)
{
size_t i;
for (i = 0; i < t->nr_files; ++i) {
free (t->files[i].path);
guestfs_free_statns (t->files[i].stat);
guestfs_free_xattr_list (t->files[i].xattrs);
free (t->files[i].csum);
}
free (t->files);
free (t);
}
struct guestfs_xattr_list *
guestfs_impl_lxattrlist (guestfs_h *g, const char *dir, char *const *names)
{
size_t len = guestfs_int_count_strings (names);
size_t i, old_len;
struct guestfs_xattr_list *ret;
ret = safe_malloc (g, sizeof *ret);
ret->len = 0;
ret->val = NULL;
while (len > 0) {
CLEANUP_FREE_XATTR_LIST struct guestfs_xattr_list *xattrs = NULL;
/* Note we don't need to free up the strings because take_strings
* does not do a deep copy.
*/
CLEANUP_FREE char **first = take_strings (g, names, LXATTRLIST_MAX, &names);
len = len <= LXATTRLIST_MAX ? 0 : len - LXATTRLIST_MAX;
xattrs = guestfs_internal_lxattrlist (g, dir, first);
if (xattrs == NULL) {
guestfs_free_xattr_list (ret);
return NULL;
}
/* Append xattrs to ret. */
old_len = ret->len;
ret->len += xattrs->len;
ret->val = safe_realloc (g, ret->val,
ret->len * sizeof (struct guestfs_xattr));
for (i = 0; i < xattrs->len; ++i, ++old_len) {
/* We have to make a deep copy of the attribute name and value.
*/
ret->val[old_len].attrname = safe_strdup (g, xattrs->val[i].attrname);
ret->val[old_len].attrval = safe_malloc (g, xattrs->val[i].attrval_len);
ret->val[old_len].attrval_len = xattrs->val[i].attrval_len;
memcpy (ret->val[old_len].attrval, xattrs->val[i].attrval,
xattrs->val[i].attrval_len);
}
}
return ret;
}
static int
mount_local_readdir (const char *path, void *buf, fuse_fill_dir_t filler,
off_t offset, struct fuse_file_info *fi)
{
DECL_G ();
DEBUG_CALL ("%s, %p, %ld", path, buf, (long) offset);
time_t now;
time (&now);
dir_cache_remove_all_expired (g, now);
struct guestfs_dirent_list *ents;
ents = guestfs_readdir (g, path);
if (ents == NULL)
RETURN_ERRNO;
size_t i;
for (i = 0; i < ents->len; ++i) {
struct stat stat;
memset (&stat, 0, sizeof stat);
stat.st_ino = ents->val[i].ino;
switch (ents->val[i].ftyp) {
case 'b': stat.st_mode = S_IFBLK; break;
case 'c': stat.st_mode = S_IFCHR; break;
case 'd': stat.st_mode = S_IFDIR; break;
case 'f': stat.st_mode = S_IFIFO; break;
case 'l': stat.st_mode = S_IFLNK; break;
case 'r': stat.st_mode = S_IFREG; break;
case 's': stat.st_mode = S_IFSOCK; break;
case 'u':
case '?':
default: stat.st_mode = 0;
}
/* Copied from the example, which also ignores 'offset'. I'm
* not quite sure how this is ever supposed to work on large
* directories. XXX
*/
if (filler (buf, ents->val[i].name, &stat, 0))
break;
}
/* Now prepopulate the directory caches. This step is just an
* optimization, don't worry if it fails.
*/
char **names = malloc ((ents->len + 1) * sizeof (char *));
if (names) {
for (i = 0; i < ents->len; ++i)
names[i] = ents->val[i].name;
names[i] = NULL;
struct guestfs_stat_list *ss = guestfs_lstatlist (g, path, names);
if (ss) {
for (i = 0; i < ss->len; ++i) {
if (ss->val[i].ino >= 0) {
struct stat statbuf;
statbuf.st_dev = ss->val[i].dev;
statbuf.st_ino = ss->val[i].ino;
statbuf.st_mode = ss->val[i].mode;
statbuf.st_nlink = ss->val[i].nlink;
statbuf.st_uid = ss->val[i].uid;
statbuf.st_gid = ss->val[i].gid;
statbuf.st_rdev = ss->val[i].rdev;
statbuf.st_size = ss->val[i].size;
statbuf.st_blksize = ss->val[i].blksize;
statbuf.st_blocks = ss->val[i].blocks;
statbuf.st_atime = ss->val[i].atime;
statbuf.st_mtime = ss->val[i].mtime;
statbuf.st_ctime = ss->val[i].ctime;
lsc_insert (g, path, names[i], now, &statbuf);
}
}
guestfs_free_stat_list (ss);
}
struct guestfs_xattr_list *xattrs = guestfs_lxattrlist (g, path, names);
if (xattrs) {
size_t ni, num;
struct guestfs_xattr *first;
struct guestfs_xattr_list *copy;
for (i = 0, ni = 0; i < xattrs->len; ++i, ++ni) {
/* assert (strlen (xattrs->val[i].attrname) == 0); */
if (xattrs->val[i].attrval_len > 0) {
++i;
first = &xattrs->val[i];
num = 0;
for (; i < xattrs->len && strlen (xattrs->val[i].attrname) > 0; ++i)
num++;
copy = copy_xattr_list (first, num);
if (copy)
xac_insert (g, path, names[ni], now, copy);
i--;
}
}
guestfs_free_xattr_list (xattrs);
}
char **links = guestfs_readlinklist (g, path, names);
if (links) {
for (i = 0; names[i] != NULL; ++i) {
if (links[i][0])
/* Note that rlc_insert owns the string links[i] after this, */
rlc_insert (g, path, names[i], now, links[i]);
else
/* which is why we have to free links[i] here. */
free (links[i]);
}
free (links); /* free the array, not the strings */
}
free (names);
}
guestfs_free_dirent_list (ents);
return 0;
}
/* Visit each directory/file/etc entry in the tree. This just stores
* the data in the tree. Note we don't store file content, but we
* keep the guestfs handle open so we can pull that out later if we
* need to.
*/
static int
visit_entry (const char *dir, const char *name,
const struct guestfs_statns *stat_orig,
const struct guestfs_xattr_list *xattrs_orig,
void *vt)
{
struct tree *t = vt;
char *path = NULL, *csum = NULL;
struct guestfs_statns *stat = NULL;
struct guestfs_xattr_list *xattrs = NULL;
size_t i;
path = full_path (dir, name);
/* Copy the stats and xattrs because the visit function will
* free them after we return.
*/
stat = guestfs_copy_statns (stat_orig);
if (stat == NULL) {
perror ("guestfs_copy_stat");
goto error;
}
xattrs = guestfs_copy_xattr_list (xattrs_orig);
if (xattrs == NULL) {
perror ("guestfs_copy_xattr_list");
goto error;
}
if (checksum && is_reg (stat->st_mode)) {
csum = guestfs_checksum (t->g, checksum, path);
if (!csum)
goto error;
}
/* If --atime option was NOT passed, flatten the atime field. */
if (!atime)
stat->st_atime_sec = stat->st_atime_nsec = 0;
/* If --dir-links option was NOT passed, flatten nlink field in
* directories.
*/
if (!dir_links && is_dir (stat->st_mode))
stat->st_nlink = 0;
/* If --dir-times option was NOT passed, flatten time fields in
* directories.
*/
if (!dir_times && is_dir (stat->st_mode))
stat->st_atime_sec = stat->st_mtime_sec = stat->st_ctime_sec =
stat->st_atime_nsec = stat->st_mtime_nsec = stat->st_ctime_nsec = 0;
/* Add the pathname and stats to the list. */
i = t->nr_files++;
if (i >= t->allocated) {
struct file *old_files = t->files;
size_t old_allocated = t->allocated;
/* Number of entries in an F15 guest was 111524, and in a
* Windows guest was 10709.
*/
if (old_allocated == 0)
t->allocated = 1024;
else
t->allocated = old_allocated * 2;
t->files = realloc (old_files, t->allocated * sizeof (struct file));
if (t->files == NULL) {
perror ("realloc");
t->files = old_files;
t->allocated = old_allocated;
goto error;
}
}
t->files[i].path = path;
t->files[i].stat = stat;
t->files[i].xattrs = xattrs;
t->files[i].csum = csum;
return 0;
error:
free (path);
free (csum);
guestfs_free_statns (stat);
guestfs_free_xattr_list (xattrs);
return -1;
}
/* This is implemented library-side in order to get around potential
* protocol limits.
*
* A journal record can contain an arbitrarily large amount of data
* (stuff like core dumps in particular). To save the user from
* having to deal with it, the implementation uses an internal
* function that downloads to a FileOut, and we reconstruct the
* hashtable entries from that.
*/
struct guestfs_xattr_list *
guestfs__journal_get (guestfs_h *g)
{
CLEANUP_UNLINK_FREE char *tmpfile = NULL;
CLEANUP_FREE char *buf = NULL;
struct stat statbuf;
struct guestfs_xattr_list *ret = NULL;
char *p, *eofield, *eobuf;
int fd = -1;
size_t i, j, size;
uint64_t len;
if (guestfs___lazy_make_tmpdir (g) == -1)
goto err;
tmpfile = safe_asprintf (g, "%s/journal%d", g->tmpdir, ++g->unique);
if (guestfs_internal_journal_get (g, tmpfile) == -1)
goto err;
fd = open (tmpfile, O_RDONLY|O_CLOEXEC);
if (fd == -1) {
perrorf (g, "open: %s", tmpfile);
goto err;
}
/* Read the whole file into memory. */
if (fstat (fd, &statbuf) == -1) {
perrorf (g, "stat: %s", tmpfile);
goto err;
}
/* Don't use safe_malloc. Want to return an errno to the caller. */
size = statbuf.st_size;
buf = malloc (size+1);
if (!buf) {
perrorf (g, "malloc: %zu bytes", size);
goto err;
}
eobuf = &buf[size];
*eobuf = '\0'; /* Makes strchr etc safe. */
if (full_read (fd, buf, size) != size) {
perrorf (g, "full-read: %s: %zu bytes", tmpfile, size);
goto err;
}
if (close (fd) == -1) {
perrorf (g, "close: %s", tmpfile);
goto err;
}
fd = -1;
j = 0;
ret = safe_malloc (g, sizeof *ret);
ret->len = 0;
ret->val = NULL;
/* There is a simple, private protocol employed here (note: it may
* be changed at any time), where fields are sent using a big-endian
* 64 bit length field followed by N bytes of 'field=data' binary
* data.
*/
for (i = 0; i < size; ) {
if (i+8 > size) {
error (g, "invalid data from guestfs_internal_journal_get: "
"truncated: "
"size=%zu, i=%zu", size, i);
goto err;
}
memcpy(&len, &buf[i], sizeof(len));
len = be64toh (len);
i += 8;
eofield = &buf[i+len];
if (eofield > eobuf) {
error (g, "invalid data from guestfs_internal_journal_get: "
"length field is too large: "
"size=%zu, i=%zu, len=%" PRIu64, size, i, len);
goto err;
}
p = strchr (&buf[i], '=');
if (!p || p >= eofield) {
error (g, "invalid data from guestfs_internal_journal_get: "
"no '=' found separating field name and data: "
"size=%zu, i=%zu, p=%p", size, i, p);
goto err;
}
*p = '\0';
j++;
ret->val = safe_realloc (g, ret->val, j * sizeof (struct guestfs_xattr));
ret->val[j-1].attrname = safe_strdup (g, &buf[i]);
ret->val[j-1].attrval_len = eofield - (p+1);
ret->val[j-1].attrval = safe_memdup (g, p+1, eofield - (p+1));
ret->len = j;
i += len;
}
return ret; /* caller frees */
err:
guestfs_free_xattr_list (ret);
if (fd >= 0)
close (fd);
return NULL;
}
