88 lines
3.2 KiB
Groff
88 lines
3.2 KiB
Groff
.\" $NetBSD: fsirand.8,v 1.6 2001/08/19 14:59:39 lukem Exp $
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.\"
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.\" Copyright (c) 1997 The NetBSD Foundation, Inc.
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.\" All rights reserved.
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.\"
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.\" This code is derived from software contributed to The NetBSD Foundation
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.\" by Christos Zoulas.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the NetBSD
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.\" Foundation, Inc. and its contributors.
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.\" 4. Neither the name of The NetBSD Foundation nor the names of its
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.\" contributors may be used to endorse or promote products derived
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.\" from this software without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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.\" POSSIBILITY OF SUCH DAMAGE.
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.\"
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.Dd August 20, 2001
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.Dt FSIRAND 8
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.Os
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.Sh NAME
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.Nm fsirand
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.Nd install random inode generation numbers in a filesystem
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.Sh SYNOPSIS
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.Nm
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.Op Fl F
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.Op Fl p
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.Op Fl x Ar constant
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.Ar special
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.Sh DESCRIPTION
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.Nm
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writes random inode generation numbers for all the inodes on device
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.Ar special .
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These random numbers make the NFS filehandles less predictable, increasing
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security of exported filesystems.
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.Pp
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.Nm
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should be run on a clean and unmounted filesystem.
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.Pp
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The options are as follows:
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.Bl -tag -width indent
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.It Fl F
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Indicates that
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.Ar special
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is a file system image in a regular file.
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.It Fl p
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Print the current inode generation numbers; the filesystem is not modified.
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.It Fl x Ar constant
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Exclusive-or the given constant with the random number used in the generation
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process.
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.El
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.Pp
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.Nm
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exits zero on success, non-zero on failure.
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.Pp
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If
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.Nm
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receives a
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.Dv SIGINFO
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signal, statistics on the amount of work completed and estimated
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completion time (in minutes:seconds) will be written to the standard
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error output.
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.Sh SEE ALSO
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.Xr fsck_ffs 8 ,
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.Xr newfs 8
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.Sh SECURITY CONSIDERATIONS
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The current implementation does not use a good random number generator,
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so the randomization can be predicted.
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