smbd: Add open_rootdir_pathref_fsp()

Get a pathref handle on the file system root. This will serve as
"basedir" for filename_convert_dirfsp_rel() to turn an absolute path
into one relative to the handle created here.

Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>

diff --git a/source3/smbd/files.c b/source3/smbd/files.c
index d739de6637e40a0caa82d662e356726b49224b3f..2100db5eaee641f45935f506e64000eb2fb38bdb 100644 (file)
--- a/source3/smbd/files.c
+++ b/source3/smbd/files.c
@@ -590,6 +590,62 @@ fail:
        return status;
 }
 
+NTSTATUS open_rootdir_pathref_fsp(connection_struct *conn,
+                                 struct files_struct **_fsp)
+{
+       struct smb_filename slash = { .base_name = discard_const_p(char, "/") };
+       struct vfs_open_how how = { .flags = O_RDONLY|O_DIRECTORY, };
+       struct files_struct *fsp = NULL;
+       NTSTATUS status;
+       int fd;
+
+       status = fsp_new(conn, conn, &fsp);
+       if (!NT_STATUS_IS_OK(status)) {
+               goto fail;
+       }
+       GetTimeOfDay(&fsp->open_time);
+       fsp_set_gen_id(fsp);
+       ZERO_STRUCT(conn->sconn->fsp_fi_cache);
+       fsp->fsp_flags.is_pathref = true;
+
+       status = fsp_set_smb_fname(fsp, &slash);
+       if (!NT_STATUS_IS_OK(status)) {
+               goto fail;
+       }
+
+       fd = SMB_VFS_OPENAT(conn,
+                           conn->cwd_fsp,
+                           fsp->fsp_name,
+                           fsp,
+                           &how);
+       if (fd == -1) {
+               status = map_nt_error_from_unix(errno);
+               goto fail;
+       }
+       fsp_set_fd(fsp, fd);
+
+       status = vfs_stat_fsp(fsp);
+       if (!NT_STATUS_IS_OK(status)) {
+               DBG_DEBUG("vfs_stat_fsp(\"/\") failed: %s\n", nt_errstr(status));
+               goto close_fail;
+       }
+       fsp->fsp_flags.is_directory = S_ISDIR(fsp->fsp_name->st.st_ex_mode);
+       if (!fsp->fsp_flags.is_directory) {
+               DBG_DEBUG("\"/\" not a directory\n");
+               status = NT_STATUS_UNEXPECTED_IO_ERROR;
+               goto close_fail;
+       }
+       fsp->file_id = vfs_file_id_from_sbuf(conn, &fsp->fsp_name->st);
+       *_fsp = fsp;
+       return NT_STATUS_OK;
+
+close_fail:
+       fd_close(fsp);
+fail:
+       file_free(NULL, fsp);
+       return status;
+}
+
 /*
  * Open a stream given an already opened base_fsp. Avoid
  * non_widelink_open: This is only valid for the case where we have a

diff --git a/source3/smbd/proto.h b/source3/smbd/proto.h
index eb584f3d1ffbdedd78ca1b2bca879a2abe127bd5..4a3d8259160f55ce941d654ee909240bd93be054 100644 (file)
--- a/source3/smbd/proto.h
+++ b/source3/smbd/proto.h
@@ -367,6 +367,8 @@ NTSTATUS open_internal_dirfsp(connection_struct *conn,
                              int open_flags,
                              struct files_struct **_fsp);
 
+NTSTATUS open_rootdir_pathref_fsp(connection_struct *conn,
+                                 struct files_struct **_fsp);
 NTSTATUS openat_pathref_fsp(const struct files_struct *dirfsp,
                            struct smb_filename *smb_fname);
 NTSTATUS open_stream_pathref_fsp(