When using smbclient to copy a directory, make sure to use the recurse and prompt commands. This makes it possible to non-interactively copy a directory and all of its contents:

smbclient -Udomainname/fordodone //10.234.92.21/sharename
Password:
Domain=[DOMAINNAME] OS=[Windows 5.0] Server=[Windows 2000 LAN Manager]
smb: \> cd testdir
smb: \testdir\> get C
NT_STATUS_FILE_IS_A_DIRECTORY opening remote file \testdir\C
smb: \testdir\> prompt
smb: \testdir\> recurse
smb: \testdir\> mget C
getting file ...