Date: Mon, 03 Nov 2003 19:00:40 +0100 From: Greg Bernard <bsd@todoo.biz> To: <freebsd-questions@freebsd.org> Subject: [FreeBSD 5.0] Problem with /etc/crontab --> /usr/libexec/save-entropy // Message-ID: <BBCC5658.20580%bsd@todoo.biz>
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I have a problem with the /usr/libexec/save-entropy script executed by
crontab in /etc/crontab :
> # Save some entropy so that /dev/random can re-seed on boot.
> */11 * * * * operator /usr/libexec/save-entropy
When I let the /etc/crontab script execute normally I have a mail generated
automatically complaining about "--: not found"
> & 1
> Message 1:
> From operator@nitel.rmm.fr Sun Nov 2 23:11:00 2003
> Date: Sun, 2 Nov 2003 23:11:00 +0100 (CET)
> From: operator@nitel.rmm.fr (Cron Daemon)
> To: operator@nitel.rmm.fr
> Subject: Cron <operator@nitel> /usr/libexec/save-entropy
> X-Cron-Env: <SHELL=3D/bin/sh>
> X-Cron-Env: <PATH=3D/etc:/bin:/sbin:/usr/bin:/usr/sbin>
> X-Cron-Env: <HOME=3D/>
> X-Cron-Env: <LOGNAME=3Doperator>
> X-Cron-Env: <USER=3Doperator>
> X-Spam-Status: No, hits=3D0.8 required=3D5.0
> tests=3DCRON_ENV,FROM_AND_TO_SAME_5,SPAM_PHRASE_00_01
> version=3D2.43
> X-Spam-Level:=20
>=20
> --: not found
I had to comment the line in /etc/crontab so that It stopped generating
error every 11 minutes, could this be a potential problem ?
I don't exactly see what seems to go wrong with the script !?
Here is the script /usr/libexec/save-entropy
#!/bin/sh
#
# Copyright (c) 2001 The FreeBSD Project
# All rights reserved.
#
# 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.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 PURPOS=
E
# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIA=
L
# 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 CONTRACT, STRIC=
T
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
#
# $FreeBSD: src/libexec/save-entropy/save-entropy.sh,v 1.2 2001/01/14
07:18:31 d
ougb Exp $
# This script is called by cron to store bits of randomness which are
# then used to seed /dev/random on boot.
# Originally developed by Doug Barton, DougB@FreeBSD.org
PATH=3D/bin:/usr/bin
# If there is a global system configuration file, suck it in.
#
if [ -r /etc/defaults/rc.conf ]; then
. /etc/defaults/rc.conf
source_rc_confs
elif [ -r /etc/rc.conf ]; then
. /etc/rc.conf
fi
case ${entropy_dir} in
[Nn][Oo])
exit 0
;;
*)
entropy_dir=3D${entropy_dir:-/var/db/entropy}
;;
esac
entropy_save_sz=3D${entropy_save_sz:-2048}
entropy_save_num=3D${entropy_save_num:-8}
if [ ! -d "${entropy_dir}" ]; then
umask 077
mkdir "${entropy_dir}" || {
logger -is -t "$0" The entropy directory "${entropy_dir}" does
not \
exist, and cannot be created. Therefore no entropy can be saved. ;
exit 1;}
/usr/sbin/chown operator:operator "${entropy_dir}"
chmod 0700 "${entropy_dir}"
fi
umask 377
for file_num in `jot ${entropy_save_num} ${entropy_save_num} 1`; do
if [ -e "${entropy_dir}/saved-entropy.${file_num}" ]; then
if [ -f "${entropy_dir}/saved-entropy.${file_num}" ]; then
new_num=3D$(($file_num + 1))
if [ "${new_num}" -gt "${entropy_save_num}" ]; then
rm -f
"${entropy_dir}/saved-entropy.${file_num}"
else
mv
"${entropy_dir}/saved-entropy.${file_num}" \
=20
"${entropy_dir}/saved-entropy.${new_num}"
fi
else
logger -is -t "$0" \
"${entropy_dir}/saved-entropy.${file_num} is not a regular file, and
therefore \
it will not be rotated. Entropy file harvesting is aborted."
exit 1
fi
fi
done
dd if=3D/dev/random of=3D"${entropy_dir}/saved-entropy.1" \
bs=3D2048 count=3D1 2> /dev/null
exit 0
=20
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PGP ID --> 0x1BA3C2FD
"I have always wished that my computer would be as easy to use as my
telephone. My wish has come true. I no longer know how to use my
telephone." - Bjarne Stroustrup
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