_cleanup_free_ char *buffer = NULL, *done = NULL, *root = NULL;
_cleanup_close_ int fd = -1;
unsigned max_follow = 32; /* how many symlinks to follow before giving up and returning ELOOP */
+ bool exists = true;
char *todo;
int r;
/* Otherwise let's see what this is. */
child = openat(fd, first + n, O_CLOEXEC|O_NOFOLLOW|O_PATH);
- if (child < 0)
+ if (child < 0) {
+
+ if (errno == ENOENT &&
+ (flags & CHASE_NON_EXISTING) &&
+ (isempty(todo) || path_is_safe(todo))) {
+
+ /* If CHASE_NON_EXISTING is set, and the path does not exist, then that's OK, return
+ * what we got so far. But don't allow this if the remaining path contains "../ or "./"
+ * or something else weird. */
+
+ if (!strextend(&done, first, todo, NULL))
+ return -ENOMEM;
+
+ exists = false;
+ break;
+ }
+
return -errno;
+ }
if (fstat(child, &st) < 0)
return -errno;
*ret = done;
done = NULL;
- return 0;
+ return exists;
}
#endif // 0
#endif // 0
enum {
CHASE_PREFIX_ROOT = 1, /* If set, the specified path will be prefixed by the specified root before beginning the iteration */
+ CHASE_NON_EXISTING = 2, /* If set, it's OK if the path doesn't actually exist. */
};
int chase_symlinks(const char *path_with_prefix, const char *root, unsigned flags, char **ret);