#!/bin/bash
# Dave Love <fx@gnu.org>, 2005-07-15
# modified for UFZ access check by <werner.flamme@ufz.de> 2015-02-26

REVISION=1.0
PROGNAME=$(/usr/bin/readlink -f $(type -p "$0" || echo "$0"))
PROGPATH=$(/usr/bin/dirname "$PROGNAME")

[ -f "$PROGPATH/utils.sh" ] && . "$PROGPATH/utils.sh"

usage () {
    echo "\
Monitoring plugin to check if the host my.ufz.de responds with a login mask

Usage:
   $PROGNAME -H <host>
   $PROGNAME --help
   $PROGNAME --version
"
}

help () {
    print_revision
    echo; usage; echo; support
}

if [ $# -lt 1 ] || [ $# -gt 2 ]; then
    usage
    exit $STATE_UNKNOWN
fi

while test -n "$1"; do
    case "$1" in
        --help | -h)
            help
            exit $STATE_OK
            ;;
        --version | -V)
            print_revision $PROGNAME $REVISION
            exit $STATE_OK
            ;;
        -H)
            shift
            host=$1
            ;;
        *)
            usage
            exit $STATE_UNKNOWN;;
    esac
    shift
done

[ -z "$host" ] && host='my.ufz.de'

if [ -z "$host" ]; then
    usage
    exit
fi

# get a name for a temporary file
FINA=$(mktemp)

# get the content to check and store it inside the temporary file
USERAGENT='Mozilla/5.0 (Windows NT 6.1; WOW64; rv:17.0) Gecko/20100101 Firefox/17.0'
# use either wget or curl, see what we have
if [ -x /usr/bin/wget ]; then
    /usr/bin/wget -q "https://$host/+CSCOE+/logon.html" --no-check-certificate -U "$USERAGENT" -O "$FINA"
elif [ -x /usr/bin/curl ]; then
    /usr/bin/curl -1 -k -L -s -A "$USERAGENT" -o "$FINA" "https://$host/+CSCOE+/logon.html"
fi

# how long is the answer?
FISIZE=$(/usr/bin/stat -c %s "$FINA")

# is it long enough?
FISZ=0
[ $FISIZE  -gt 2000 ] && FISZ=1

# does it contain the correct text?
FIOK=0
grep -q 'id="username" name="username"' "$FINA" && FIOK=1

# remove the temporary file
rm "$FINA"

# OK, so let's look ath the results...
if [ $FISZ -eq 0 ]; then
    # error, if the answer is too small
    echo "CRITICAL: only $FISZ bytes found (\> 2000 expected)"
    exit $STATE_CRITICAL
elif [ $FIOK  -eq 0 ]; then
    # warning, if the answer does not contain the expected text
    echo "WARNING: input field for username not found"
    exit $STATE_WARNING
else
    # so, if both checks are OK, we can tell nagios so :-)
    FITEXT="answer size: $FISIZE bytes; input field for username found"
    echo "OK: $FITEXT"
    exit $STATE_OK
fi