/usr/share/doc/cron/examples/cron-tasks-review.sh is in cron 3.0pl1-124ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 | #!/bin/bash
#
# Review the cron tasks defined in the system and warn the admin
# if some of the files will not be run
#
# This program is copyright 2011 by Javier Fernandez-Sanguino <jfs@debian.org>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
#
# For more information please see
# http://www.gnu.org/licenses/licenses.html#GPL
set -e
# reset locale, just in case
LC_ALL=C
export LC_ALL
PROGNAME=${0##*/}
PROGVERSION=1.0
# Command line options
SHORTOPTS=hvsi
LONGOPTS=help,version,syslog,info
set -- $(getopt -s bash -o $SHORTOPTS -l $LONGOPTS --n $PROGNAME -- "$@")
version () {
echo "$PROGNAME $PROGVERSION"
echo "$PROGNAME is copyright © Javier Fernandez-Sanguino <jfs@debian.org>"
echo "Released under the terms of the GPL version 2 or later"
echo "This program is part of the cron package"
}
usage () {
cat <<EOUSE
Usage: $PROGNAME [-si]
Reviews the directories used by cron and reports scripts that
might not be run by cron due to problems in their naming or
in their setup.
You should run this program as root to prevent false positives.
Options:
-s -- Use syslog to report information
-i -- Report also informational messages
EOUSE
}
syslog="no"
send_info="no"
for opt in $@; do
case $opt in
-h|--help) usage; exit 0;;
-v|--version) version; exit 0;;
-s|--syslog) syslog="yes";;
-i|--info) send_info="yes";;
*) ;;
esac
done
send_message () {
level=$1
msg=$2
[ "$level" = "info" ] && [ "$send_info" = "no" ] && return
if [ "$syslog" = "yes" ] ; then
logger -p cron.$level -t CRON $msg
else
case $level in
"warn")
echo "WARN: $msg" >&2
;;
"info")
echo "INFO: $msg"
;;
esac
fi
}
warn () {
# Send a warning to the user
file=$1
reason=$2
name=`basename $file`
# Skip hidden files
echo $name | grep -q -E '^\.' && return
# Skip disabled files
echo $name | grep -q -E '\.disabled' && return
# TODO: Should we send warnings for '.old' or '.orig'?
# Do not send a warning if the file is '.dpkg-old' or '.dpkg-dist'
if ! echo $file | grep -q -E '\.dpkg-(old|dist)$' ; then
send_message "warn" "The file $file will not be executed by cron: $reason"
else
send_message "info" "The file $file is a leftover from the Debian package manager"
fi
}
check_results () {
dir=$1
run_file=$2
exec_test=$3
# Now check the files we found and the ones that exist in the directory
find $dir \( -type f -o -type l \) -printf '%p %l\n' |
while read file pointer; do
if ! grep -q "^$file$" $run_file; then
[ -L "$file" ] && [ ! -e "$pointer" ] && \
warn $file "Points to an nonexistent location ($pointer)" && continue
[ "$exec_test" = "yes" ] && [ ! -x "$file" ] && \
warn $file "Is not executable" && continue
[ ! -r "$file" ] && [ "`id -u`" != "0" ] && \
warn $file "Cannot read the file to determine if it will be run ($PROGNAME is not running as root)" && continue
[ ! -r "$file" ] && \
warn $file "File is unreadable" && continue
warn $file "Does not conform to the run-parts convention"
else
# do additional checks for symlinks for files that *are* listed by run-parts
if [ -L "$file" ] ; then
# for symlinks: does the file exist?
if [ ! -e "$pointer" ] ; then
warn $file "Points to an nonexistent location ($pointer)"
fi
# for symlinks: is it owned by root?
owner=`ls -l $pointer | awk '{print $3}'`
if [ "$owner" != "root" ]; then
warn $file "Is not owned by root"
fi
fi
fi
done
}
# Setup for the tests
# First: check if we are using -l
[ -r /etc/default/cron ] && . /etc/default/cron
use_lsb="no"
[ "$LSBNAMES" = "-l" ] && use_lsb="yes"
echo $EXTRA_OPTS | grep -q -- '-l' && use_lsb="yes"
# Set the options for run parts
run_opts=""
[ "$use_lsb" = "yes" ] && run_opts="--lsbsysinit"
temp=`tempfile` || { echo "ERROR: Cannot create temporary file" >&2 ; exit 1; }
trap "rm -f $temp" 0 1 2 3 13 15
# Now review the scripts, note that cron does not use run-parts to run these
# so they are *not* required to be executables, just to conform with the
# Step 1: Review /etc/cron.d
run-parts $run_opts --list /etc/cron.d >$temp
check_results /etc/cron.d $temp "no"
# Step 2: Review /etc/cron.{hourly,daily,weekly,monthly}
for interval in hourly daily weekly monthly; do
testdir=/etc/cron.$interval
run-parts $run_opts --test $testdir >$temp
check_results $testdir $temp "yes"
done
exit 0
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