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Revision 1.7, Fri Nov 16 04:25:43 2001 UTC (22 years, 4 months ago) by lukem
Branch: MAIN
CVS Tags: netbsd-3-base, netbsd-3-1-RELEASE, netbsd-3-1-RC4, netbsd-3-1-RC3, netbsd-3-1-RC2, netbsd-3-1-RC1, netbsd-3-1-1-RELEASE, netbsd-3-1, netbsd-3-0-RELEASE, netbsd-3-0-RC6, netbsd-3-0-RC5, netbsd-3-0-RC4, netbsd-3-0-RC3, netbsd-3-0-RC2, netbsd-3-0-RC1, netbsd-3-0-3-RELEASE, netbsd-3-0-2-RELEASE, netbsd-3-0-1-RELEASE, netbsd-3-0, netbsd-3, netbsd-2-base, netbsd-2-1-RELEASE, netbsd-2-1-RC6, netbsd-2-1-RC5, netbsd-2-1-RC4, netbsd-2-1-RC3, netbsd-2-1-RC2, netbsd-2-1-RC1, netbsd-2-1, netbsd-2-0-base, netbsd-2-0-RELEASE, netbsd-2-0-RC5, netbsd-2-0-RC4, netbsd-2-0-RC3, netbsd-2-0-RC2, netbsd-2-0-RC1, netbsd-2-0-3-RELEASE, netbsd-2-0-2-RELEASE, netbsd-2-0-1-RELEASE, netbsd-2-0, netbsd-2, netbsd-1-6-base, netbsd-1-6-RELEASE, netbsd-1-6-RC3, netbsd-1-6-RC2, netbsd-1-6-RC1, netbsd-1-6-PATCH002-RELEASE, netbsd-1-6-PATCH002-RC4, netbsd-1-6-PATCH002-RC3, netbsd-1-6-PATCH002-RC2, netbsd-1-6-PATCH002-RC1, netbsd-1-6-PATCH002, netbsd-1-6-PATCH001-RELEASE, netbsd-1-6-PATCH001-RC3, netbsd-1-6-PATCH001-RC2, netbsd-1-6-PATCH001-RC1, netbsd-1-6-PATCH001, netbsd-1-6, fvdl_fs64_base
Changes since 1.6: +8 -3 lines

change -F semantics to treat the argument as a file system image; open it
`as-is' without attempting to determine the device name with opendisk(3),
and don't attempt to read a disklabel.

.\"	$NetBSD: fsirand.8,v 1.7 2001/11/16 04:25:43 lukem Exp $
.\"
.\" Copyright (c) 1997 The NetBSD Foundation, Inc.
.\" All rights reserved.
.\"
.\" This code is derived from software contributed to The NetBSD Foundation
.\" by Christos Zoulas.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\"    notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\"    notice, this list of conditions and the following disclaimer in the
.\"    documentation and/or other materials provided with the distribution.
.\" 3. All advertising materials mentioning features or use of this software
.\"    must display the following acknowledgement:
.\"        This product includes software developed by the NetBSD
.\"        Foundation, Inc. and its contributors.
.\" 4. Neither the name of The NetBSD Foundation nor the names of its
.\"    contributors may be used to endorse or promote products derived
.\"    from this software without specific prior written permission.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
.\" PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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.\"
.Dd November 16, 2001
.Dt FSIRAND 8
.Os
.Sh NAME
.Nm fsirand
.Nd install random inode generation numbers in a filesystem
.Sh SYNOPSIS
.Nm
.Op Fl F
.Op Fl p
.Op Fl x Ar constant
.Ar special
.Sh DESCRIPTION
.Nm
writes random inode generation numbers for all the inodes on device
.Ar special .
These random numbers make the NFS filehandles less predictable, increasing
security of exported filesystems.
.Pp
.Nm
should be run on a clean and unmounted filesystem.
.Pp
The options are as follows:
.Bl -tag -width indent
.It Fl F
Indicates that
.Ar special
is a file system image, rather than a device name.
.Ar special
will be accessed
.Sq as-is ,
without requiring that it is a raw character device and without
attempting to read a disklabel.
.It Fl p
Print the current inode generation numbers; the filesystem is not modified.
.It Fl x Ar constant
Exclusive-or the given constant with the random number used in the generation
process.
.El
.Pp
.Nm
exits zero on success, non-zero on failure.
.Pp
If
.Nm
receives a
.Dv SIGINFO
signal, statistics on the amount of work completed and estimated
completion time (in minutes:seconds) will be written to the standard
error output.
.Sh SEE ALSO
.Xr fsck_ffs 8 ,
.Xr newfs 8
.Sh SECURITY CONSIDERATIONS
The current implementation does not use a good random number generator,
so the randomization can be predicted.