File check_webpage_sync of Package monitoring-plugins-webpage_sync

#!/bin/bash
#
# check_web_timestamp - nagios plugin
#
# Copyright (C) 2013, SUSE LCC
# Author: Lars Vogdt
#
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
# * Redistributions of source code must retain the above copyright notice, this
#   list of conditions and the following disclaimer.
#
# * 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.
#
# * Neither the name of the Novell nor the names of its contributors may be
#   used to endorse or promote products derived from this software without
#   specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL 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, STRICT 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.
#


PROGNAME=$(/bin/basename $0)
REVISION='0.3'
WGET=$(which wget)
TIMEOUT=10
VERBOSE='no'

OK=0
WARNING=1
CRITICAL=2
UNKNOWN=3

WARN=2
CRIT=5

OUTPUT='UNKOWN: script did not produce valuable output'

print_usage() {
    echo "Usage: $(basename $0) -u http://my.url.test/file -c 5 -w 2"
    echo "       -u : url for remote file"
    echo "       -c : critical (in days - default $CRIT)"
    echo "       -w : warning  (in days - default $WARN)"
    echo "       -t : timeout  (default: $TIMEOUT)"
    echo "       -v : be verbose"
    echo 
    echo "The script expects the first line of the downloaded file to contain something like:"
    echo " 2020-03-20T00:14:41+0100 or 2020-03-20 00:14:41"
    echo "Something that date \"+%Y-%m-%d %H:%M:%S\" prints out"
    echo
}

print_help() {
    print_revision
    echo
    print_usage
    echo
}

print_revision() {
    echo -e "$PROGNAME Version $REVISION\n"
    echo -e "The nagios plugins come with ABSOLUTELY NO WARRANTY. You may redistribute\ncopies of the plugins under the terms of the GNU General Public License.\nFor more information about these matters, see the file named COPYING.\n"
}

cleanup_and_exit() {
    local exitcode="$1"
    rm "$URL_FILE" 2>/dev/null
    echo "$OUTPUT"
    exit $exitcode
}

if [ $# -lt 1 ]; then
    print_usage
    exit $UNKNOWN
fi

while getopts 'u:w:c:t:vV'  OPTION ; do
    case $OPTION in
        V)
            echo "Version: $REVISION"
            exit $OK
        ;;
        v)
            VERBOSE='yes'
        ;;
        h)
            print_usage
            exit $OK
        ;;
        w)
            WARN="$OPTARG"
        ;;
        c)
            CRIT="$OPTARG"
        ;;
        u)
            URL="$OPTARG"
        ;;
        t) 
            TIMEOUT="$OPTARG"
        ;;
        *)
            print_usage
            exit $UNKNOWN
        ;;
    esac
done
shift $(( OPTIND - 1 ))

# check warning and critical value
if [ ${WARN} -ge ${CRIT} ]; then
    echo "Warning level has the same size or is greater the the critical values."
    echo "Please change and rerun ..."
    exit $UNKNOWN
fi

if [ -z "$URL" ]; then
    echo "No valid url for option -u: $URL" >&2
    print_usage
    exit $UNKNOWN
fi

trap 'echo' SIGHUP SIGINT SIGQUIT
trap 'cleanup_and_exit 2' SIGTRAP SIGBUS SIGKILL SIGPIPE SIGTERM

URL_FILE=$(mktemp /tmp/$(basename $0)-XXXXXX)
$WGET -q --timeout=$TIMEOUT --output-document="$URL_FILE" "$URL"

NOW=$(date +%s)
OLD=$(cat "$URL_FILE")
SYNCED=$(date +%s -d "$OLD" 2>/dev/null)
if grep -qi "down for maintenance" $URL_FILE ; then
   OLD=$(echo "last year" ; cat "$URL_FILE")
   SYNCED=$(date +%s -d "last year")
fi
let "WARN=$WARN*24"
let "CRIT=$CRIT*24"

let "DIFF=$NOW-$SYNCED"

if [ "$VERBOSE" == "yes" ]; then
    echo "URL : $URL"
    echo -n "Old : "
    cat "$URL_FILE"
    echo -n "Now : "
    date "+%Y-%m-%d %H:%M:%S"
    echo "WARN: $WARN"
    echo "CRIT: $CRIT"
    echo "DIFF: $DIFF"
fi

if [ "$DIFF" -lt "3600" ]; then
    OUTPUT="OK: $URL was updated less than an hour ago"
    cleanup_and_exit $OK
else
    # Compute the approximate hour difference
    hDIFF=$(scale=2; echo "$DIFF/3600" | bc)
    if [ "$hDIFF" -lt "$WARN" ]; then
        OUTPUT="OK: $URL was updated $hDIFF hour(s) ago"
        cleanup_and_exit $OK
    fi
    if [ "$hDIFF" -lt "$CRIT" ]; then
        OUTPUT="WARNING: $URL was last updated at $OLD"
        cleanup_and_exit $WARNING
    else
        OUTPUT="CRITICAL: $URL was last updated at $OLD"
        cleanup_and_exit $CRITICAL
    fi
fi