diff options
| -rwxr-xr-x | nagios-check-running-kernel | 107 |
1 files changed, 107 insertions, 0 deletions
diff --git a/nagios-check-running-kernel b/nagios-check-running-kernel new file mode 100755 index 0000000..818288f --- /dev/null +++ b/nagios-check-running-kernel @@ -0,0 +1,107 @@ +#!/bin/bash + +# Check if the running kernel has the same version string as the on-disk +# kernel image. + +# Copyright 2008 Peter Palfrader +# +# Permission is hereby granted, free of charge, to any person obtaining +# a copy of this software and associated documentation files (the +# "Software"), to deal in the Software without restriction, including +# without limitation the rights to use, copy, modify, merge, publish, +# distribute, sublicense, and/or sell copies of the Software, and to +# permit persons to whom the Software is furnished to do so, subject to +# the following conditions: +# +# The above copyright notice and this permission notice shall be +# included in all copies or substantial portions of the Software. +# +# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, +# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF +# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND +# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE +# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION +# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION +# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. + +OK=0; +WARNING=1; +CRITICAL=2; +UNKNOWN=3; + +get_offset() { + local file needle + + file="$1" + needle="$2" + perl -e ' + undef $/; + $i = index(<>, "'"$needle"'"); + if ($i < 0) { + exit 1; + }; + print $i,"\n"' < "$file" +} + +get_image() { + local image GZHDR1 GZHDR2 off + + image="$1" + + GZHDR1="\x1f\x8b\x08\x00" + GZHDR2="\x1f\x8b\x08\x08" + + off=`get_offset "$image" $GZHDR1` + [ "$?" != "0" ] && off="-1" + if [ "$off" -eq "-1" ]; then + off=`get_offset "$image" $GZHDR2` + [ "$?" != "0" ] && off="-1" + fi + if [ "$off" -eq "0" ]; then + zcat < "$image" + return + elif [ "$off" -ne "-1" ]; then + (dd ibs="$off" skip=1 count=0 && dd bs=512k) < "$image" 2>/dev/null | zcat 2>/dev/null + return + fi + + echo "ERROR: Unable to extract kernel image." 2>&1 + exit 1 +} + +searched="" +for on_disk in \ + "/boot/vmlinuz-`uname -r`"\ + "/boot/vmlinux-`uname -r`"; do + + if [ -e "$on_disk" ]; then + on_disk_version="`get_image "$on_disk" | strings | grep 'Linux version' | head -n1`" + [ -z "$on_disk_version" ] || break + on_disk_version="`cat "$on_disk" | strings | grep 'Linux version' | head -n1`" + [ -z "$on_disk_version" ] || break + + echo "UNKNOWN: Failed to get a version string from image $on_disk" + exit $UNKNOWN + fi + searched="$searched $on_disk" +done + +if ! [ -e "$on_disk" ]; then + echo "WARNING: Did not find a kernel image (checked$searched) - I have no idea which kernel I am running" + exit $WARNING +fi + + +running_version="`cat /proc/version`" +if [ -z "$running_version" ] ; then + echo "UNKNOWN: Failed to get a version string from running system" + exit $UNKNOWN +fi + +if [ "$running_version" != "$on_disk_version" ]; then + echo "WARNING: Running kernel does not match on-disk kernel image: [$running_version != $on_disk_version]" + exit $WARNING +else + echo "OK: Running kernel matches on disk image: [$running_version]" + exit $OK +fi |