1.\" Copyright (c) 1997 Todd C. Miller <Todd.Miller@courtesan.com> 2.\" All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 3. All advertising materials mentioning features or use of this software 13.\" must display the following acknowledgment: 14.\" This product includes software developed by Todd C. Miller. 15.\" 4. The name of the author may not be used to endorse or promote products 16.\" derived from this software without specific prior written permission. 17.\" 18.\" THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, 19.\" INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY 20.\" AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL 21.\" THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 22.\" EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 23.\" PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 24.\" OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 25.\" WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 26.\" OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 27.\" ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28.\" 29.\" $OpenBSD: fsirand.8,v 1.6 1997/02/23 03:58:26 millert Exp $ 30.\" $FreeBSD$ 31.\" 32.Dd January 25, 1997 33.Dt FSIRAND 8 34.Os 35.Sh NAME 36.Nm fsirand 37.Nd randomize inode generation numbers 38.Sh SYNOPSIS 39.Nm fsirand 40.Op Fl b 41.Op Fl f 42.Op Fl p 43.Ar special 44.Op Ar "special ..." 45.Sh DESCRIPTION 46The 47.Nm 48command installs random generation numbers on all the inodes for 49each filesystem specified on the command line by 50.Ar special . 51This increases the security of NFS-exported filesystems by making 52it difficult to ``guess'' filehandles. 53.Pp 54.Em Note Ns : 55.Xr newfs 8 56now does the equivalent of 57.Nm 58itself so it is no longer necessary to 59run 60.Nm 61by hand on a new filesystem. It is only used to 62re-randomize or report on an existing filesystem. 63.Pp 64.Nm Fsirand 65should only be used on an unmounted filesystem that 66has been checked with 67.Xr fsck 8 68or a filesystem that is mounted read-only. 69.Nm Fsirand 70may be used on the root filesystem in single-user mode 71but the system should be rebooted via ``reboot -n'' afterwards. 72.Sh OPTIONS 73.Bl -tag -width indent 74The available options are as follows: 75.It Fl b 76Use the default block size (usually 512 bytes) instead 77of the value gleaned from the disklabel. 78.It Fl f 79Force 80.Nm 81to run even if the filesystem on 82.Ar special 83is not marked as clean. 84.It Fl p 85Print the current generation numbers for all inodes instead of 86generating new ones. 87.Sh CAVEATS 88Since 89.Nm 90allocates enough memory to hold all the inodes in 91a given cylinder group it may use a large amount 92of memory for large disks with few cylinder groups. 93.Sh SEE ALSO 94.Xr fs 5 , 95.Xr fsck 8 , 96.Xr newfs 8 97.Sh HISTORY 98The 99.Nm 100command appeared in SunOS 3.x. 101.br 102This version of 103.Nm 104first appeared in 105.Ox 2.1 . 106A 107.Bx Free 108version first appeared in 109.Fx 2.2.5 . 110.Sh AUTHORS 111.An Todd C. Miller Aq Todd.Miller@courtesan.com 112