#!/bin/sh
#
# THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
#
test -n "$1" || exit 1
test -n "$2" || exit 1
HOST="$1"
INTERFACE="$2"
COMMUNITY="public"
RRDFILES="/var/rrdtool"
IMAGES="/var/www/htdocs"
RRDTOOL="/usr/local/bin/rrdtool"
UPTIME=$(cat /tmp/${HOST}-uptime.txt)
NOW=$(date "+%Y-%m-%d %H:%M:%S %Z" | sed 's/:/\\:/g')

if ! test -f "${RRDFILES}/${HOST}-${INTERFACE}.rrd"
then
echo "Creating ${RRDFILES}/${HOST}-${INTERFACE}.rrd"
${RRDTOOL} create ${RRDFILES}/${HOST}-${INTERFACE}.rrd \
	--step 300 \
	DS:ds0:COUNTER:600:0:1250000000 \
	DS:ds1:COUNTER:600:0:1250000000  \
	RRA:AVERAGE:0.5:1:600 \
	RRA:AVERAGE:0.5:6:700 \
	RRA:AVERAGE:0.5:24:775 \
	RRA:AVERAGE:0.5:288:797 \
	RRA:MAX:0.5:1:600 \
	RRA:MAX:0.5:6:700 \
	RRA:MAX:0.5:24:775 \
	RRA:MAX:0.5:288:797
fi

IN=$(snmpctl snmp get ${HOST} community ${COMMUNITY} oid ifInOctets.${INTERFACE} | cut -d= -f2)
OUT=$(snmpctl snmp get ${HOST} community ${COMMUNITY} oid ifOutOctets.${INTERFACE} | cut -d= -f2)
DESCR=$(snmpctl snmp get ${HOST} community ${COMMUNITY} oid ifDescr.${INTERFACE} | cut -d= -f2 | tr -d '"')

${RRDTOOL} update ${RRDFILES}/${HOST}-${INTERFACE}.rrd N:${IN}:${OUT}

${RRDTOOL} graph ${IMAGES}/${HOST}-${INTERFACE}.png \
	--start -43200 \
	--title "${HOST} - ${DESCR}" \
	--vertical-label "Bits per Second" \
	--watermark "OpenBSD Amsterdam - https://obsda.ms" \
	DEF:IN=${RRDFILES}/${HOST}-${INTERFACE}.rrd:ds0:AVERAGE \
	DEF:OUT=${RRDFILES}/${HOST}-${INTERFACE}.rrd:ds1:AVERAGE \
	CDEF:IN_CDEF="IN,8,*" \
	CDEF:OUT_CDEF="OUT,8,*" \
	AREA:IN_CDEF#00FF00:"In " \
	GPRINT:IN_CDEF:MAX:"Max\:%5.2lf %s" \
	GPRINT:IN_CDEF:AVERAGE:"Average\:%5.2lf %s" \
	GPRINT:IN_CDEF:LAST:" Current\:%5.2lf %s\n" \
	LINE2:OUT_CDEF#0000FF:"Out" \
	GPRINT:OUT_CDEF:MAX:"Max\:%5.2lf %s" \
	GPRINT:OUT_CDEF:AVERAGE:"Average\:%5.2lf %s" \
	GPRINT:OUT_CDEF:LAST:" Current\:%5.2lf %s\n" \
	COMMENT:"\\n" \
	COMMENT:"  Up for ${UPTIME} at ${NOW}"