http://src.opensolaris.org/source/xref/onnv/onnv-gate/usr/src/uts/common/smbsrv/ndl/

[Luke Kenneth Casson Leighton]

holy cow.  opensolaris appears to have its own smb server / idl compiler:
http://src.opensolaris.org/source/xref/onnv/onnv-gate/usr/src/tools/ndrgen/

CDDL licensed, unfortunately (listed as incompatible with GPL.  darn).

but... dang :)