get_symlink_name(const void *resource, size_t resource_len, char *buf,
size_t buf_len, u32 reparse_tag)
{
- const u8 *p = resource;
+ const void *p = resource;
u16 substitute_name_offset;
u16 substitute_name_len;
u16 print_name_offset;
size_t link_target_len;
ssize_t ret;
unsigned header_size;
- char *translated_target;
- bool is_absolute;
- u32 flags;
+ bool translate_slashes;
if (resource_len < 12)
return -EIO;
p = get_u16(p, &substitute_name_len);
p = get_u16(p, &print_name_offset);
p = get_u16(p, &print_name_len);
- get_u32(p, &flags);
wimlib_assert(reparse_tag == WIM_IO_REPARSE_TAG_SYMLINK ||
reparse_tag == WIM_IO_REPARSE_TAG_MOUNT_POINT);
- if (reparse_tag == WIM_IO_REPARSE_TAG_MOUNT_POINT) {
+ if (reparse_tag == WIM_IO_REPARSE_TAG_MOUNT_POINT)
header_size = 8;
- } else {
- is_absolute = (flags & 1) ? false : true;
+ else {
header_size = 12;
p += 4;
}
if (header_size + substitute_name_offset + substitute_name_len > resource_len)
return -EIO;
- ret = utf16le_to_mbs((const utf16lechar*)(p + substitute_name_offset),
- substitute_name_len,
- &link_target, &link_target_len);
+ ret = utf16le_to_tstr((const utf16lechar*)(p + substitute_name_offset),
+ substitute_name_len,
+ &link_target, &link_target_len);
if (ret)
return -errno;
- wimlib_assert(ret == 0);
-
- if (!link_target)
- return -EIO;
-
if (link_target_len + 1 > buf_len) {
ret = -ENAMETOOLONG;
goto out;
}
- translated_target = link_target;
- if (reparse_tag == WIM_IO_REPARSE_TAG_MOUNT_POINT || is_absolute) {
- if (link_target_len < 7
- || memcmp(translated_target, "\\??\\", 4) != 0
- || translated_target[4] == '\0'
- || translated_target[5] != ':'
- || translated_target[6] != '\\') {
- ret = -EIO;
- goto out;
- }
- translated_target += 4;
- link_target_len -= 4;
- /* There's a drive letter, so just leave the backslashes since
- * it won't go anyhwere on UNIX anyway...
- *
- * XXX
- * NTFS-3g tries to re-map these links to actually point to
- * something, so maybe we could do something like that here
- * XXX*/
+ DEBUG("Interpeting substitute name \"%s\" (ReparseTag=0x%x)",
+ link_target, reparse_tag);
+ translate_slashes = true;
+ if (link_target_len >= 7 &&
+ link_target[0] == '\\' &&
+ link_target[1] == '?' &&
+ link_target[2] == '?' &&
+ link_target[3] == '\\' &&
+ link_target[4] != '\0' &&
+ link_target[5] == ':' &&
+ link_target[6] == '\\')
+ {
+ /* "Full" symlink or junction (\??\x:\ prefixed path) */
+ link_target += 6;
+ link_target_len -= 6;
+ } else if (reparse_tag == WIM_IO_REPARSE_TAG_MOUNT_POINT &&
+ link_target_len >= 12 &&
+ memcmp(link_target, "\\\\?\\Volume{", 11) == 0 &&
+ link_target[link_target_len - 1] == '\\')
+ {
+ /* Volume junction. Can't really do anything with it. */
+ translate_slashes = false;
+ } else if (reparse_tag == WIM_IO_REPARSE_TAG_SYMLINK &&
+ link_target_len >= 3 &&
+ link_target[0] != '\0' &&
+ link_target[1] == ':' &&
+ link_target[2] == '/')
+ {
+ /* "Absolute" symlink, with drive letter */
+ link_target += 2;
+ link_target_len -= 2;
+ } else if (reparse_tag == WIM_IO_REPARSE_TAG_SYMLINK &&
+ link_target_len >= 1)
+ {
+ if (link_target[0] == '/')
+ /* "Absolute" symlink, without drive letter */
+ ;
+ else
+ /* "Relative" symlink, without drive letter */
+ ;
} else {
- for (size_t i = 0; i < link_target_len; i++)
- if (translated_target[i] == '\\')
- translated_target[i] = '/';
+ ERROR("Invalid reparse point: \"%s\"", link_target);
+ ret = -EIO;
+ goto out;
}
- memcpy(buf, translated_target, link_target_len + 1);
+ if (translate_slashes)
+ for (size_t i = 0; i < link_target_len; i++)
+ if (link_target[i] == '\\')
+ link_target[i] = '/';
+ memcpy(buf, link_target, link_target_len + 1);
ret = link_target_len;
out:
FREE(link_target);
size_t len = 12 + name_utf16le_nbytes * 2;
void *buf = MALLOC(len);
if (buf) {
- u8 *p = buf;
+ void *p = buf;
p = put_u16(p, name_utf16le_nbytes); /* Substitute name offset */
p = put_u16(p, name_utf16le_nbytes); /* Substitute name length */
p = put_u16(p, 0); /* Print name offset */
*/
ssize_t
inode_readlink(const struct wim_inode *inode, char *buf, size_t buf_len,
- const WIMStruct *w, int read_resource_flags)
+ const WIMStruct *w, bool threadsafe)
{
const struct wim_lookup_table_entry *lte;
int ret;
if (!lte)
return -EIO;
- if (wim_resource_size(lte) > 10000)
+ if (wim_resource_size(lte) > REPARSE_POINT_MAX_SIZE)
return -EIO;
u8 res_buf[wim_resource_size(lte)];
- ret = read_full_wim_resource(lte, res_buf, read_resource_flags);
- if (ret != 0)
+ ret = read_full_resource_into_buf(lte, res_buf, threadsafe);
+ if (ret)
return -EIO;
return get_symlink_name(res_buf, wim_resource_size(lte), buf,
buf_len, inode->i_reparse_tag);
ret = make_symlink_reparse_data_buf(target, &symlink_buf_len,
&symlink_buf);
- if (ret != 0)
+ if (ret)
return ret;
DEBUG("Made symlink reparse data buf (len = %zu, name len = %zu)",
lte->resource_location = RESOURCE_IN_ATTACHED_BUFFER;
lte->attached_buffer = symlink_buf;
lte->resource_entry.original_size = symlink_buf_len;
- lte->resource_entry.size = symlink_buf_len;
copy_hash(lte->hash, symlink_buf_hash);
}
return ret;
}
-#endif /* !defined(__WIN32__) && !defined(WITH_FUSE) */
+#endif /* !defined(__WIN32__) */
git://wimlib.net / wimlib / blobdiff