Device-Clean Scripts

Device allocation satisfies part of what is called the object reuse requirement. The device-clean scripts address the security requirement that all usable data be purged from a physical device before reuse. The data is cleared before the device is allocatable by another user. By default, cartridge tape drives, diskette drives, CD-ROM drives, and audio devices require device-clean scripts. The Solaris OS provides the scripts. This section describes what device-clean scripts do.

Device-Clean Script for Tapes

The st_clean device-clean script supports three tape devices:

• SCSI ¼-inch tape

• Archive ¼-inch tape

• Open-reel ½-inch tape

The st_clean script uses the rewoffl option to the mt command to clean up the device. For more information, see the mt(1) man page. If the script runs during system boot, the script queries the device to determine if the device is online. If the device is online, the script determines if the device has media in it. The ¼-inch tape devices that have media in them are placed in the allocate error state. The allocate error state forces the administrator to manually clean up the device.

During normal system operation, when the deallocate command is executed in interactive mode, the user is prompted to remove the media. Deallocation is delayed until the media is removed from the device.

Device-Clean Scripts for Diskettes and CD-ROM Drives

The following device-clean scripts are provided for diskettes and CD-ROM drives:

• fd_clean script – Is a device-clean script for diskettes.

• sr_clean script – Is a device-clean script for CD-ROM drives.

The scripts use the eject command to remove the media from the drive. If the eject command fails, the device is placed in the allocate error state. For more information, see the eject(1) man page.

Device-Clean Script for Audio

Audio devices are cleaned up with an audio_clean script. The script performs an AUDIO_GETINFO ioctl system call to read the device. The script then performs an AUDIO_SETINFO ioctl system call to reset the device configuration to the default.

Writing New Device-Clean Scripts

If you add more allocatable devices to the system, you might need to create your own device-clean scripts. The deallocate command passes a parameter to the device-clean scripts. The parameter, which is shown here, is a string that contains the device name. For more information, see the device_allocate(4) man page.

clean-script -[I|i|f|S] device-name

Device-clean scripts must return “0” for success and greater than “0” for failure. The options -I, -f, and -S determine the running mode of the script:

-I

Is needed during system boot only. All output must go to the system console. Failure or inability to forcibly eject the media must put the device in the allocate error state.

-i

Similar to the -I option, except that output is suppressed.

-f

Is for forced cleanup. The option is interactive and assumes that the user is available to respond to prompts. A script with this option must attempt to complete the cleanup if one part of the cleanup fails.

-S

Is for standard cleanup. The option is interactive and assumes that the user is available to respond to prompts.