The NUC NetWare Loadable Module (NUC.NLM)

On NetWare servers 3.11 or later, NUC can use the NUC.NLM to provide better integration for variations between the UnixWare and NetWare file systems by taking advantage of the UNIX (that is, NFS) name space information available on NetWare volumes.

Access control modes for NetWare volumes are fully discussed in ``Accessing NetWare volumes from UnixWare''. NUC.NLM provides the NetWare server administrator an option to choose between a UNIX-flavored access control mechanism or a NetWare-flavored access control mechanism through the UNIX mode and the NetWare mode. Without NUC.NLM installed, only DOS-style access to a volume (that is, DOS mode) is supported.

NUC.NLM NetWare mode access control

This mode provides ID mapping and NetWare rights to UnixWare permission mapping that allows the administrator to control access to the NetWare volume using the traditional NetWare access control methods, such as trustee assignments, inherited rights mask, and so on. In this mode, the access control algorithms will map NetWare rights to UnixWare permissions.

There are, however, several limitations to using this mode when changing permissions using the chmod(1) command.

• The ``rw'' permissions cannot be added or deleted from a file or directory. The chmod command succeeds but the permissions are not changed.

• Only the ``x'' permission can be added or deleted from a file or directory.

• When file or directory permissions (residing in a NUCFS file system which uses the NUC.NLM NetWare mode) are changed, NUCFS must check to see what the permissions were changed to and then present the changes.

  Here are some examples of expected behavior:

  • chmod 444 on a file with 666 permissions succeeds but does not change the permissions.

  • chmod 555 on a file with 777 permissions succeeds but does not change the permissions.

  • chmod 555 on a file with 666 permissions succeeds but changes the permissions to 777.

  • chmod 111 on a file with 666 permissions succeeds but changes the permissions to 777.

NUC.NLM UNIX mode access control

This mode allows the administrator to control access to the server volumes from UnixWare as well as NetWare. When a change in access control is made from one side, the best possible mapping is done to reflect this change on the other side.

For example, if permissions are granted from UnixWare, equivalent trustee assignments are generated for the NetWare login user and the mapped NetWare group(s). In some cases, DOS file attributes may also be modified to ensure best possible file sharing between UnixWare and NetWare platforms.

The chgrp and chown commands are supported in UNIX mode.