#!/bin/sh
#
# Copyright (c) 2019-2022 Mischa Peters <mischa @ openbsd.amsterdam>
#
# Permission to use, copy, modify, and distribute this software for any
# purpose with or without fee is hereby granted, provided that the above
# copyright notice and this permission notice appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
#
test -n "$1" || exit 1
test -n "$2" || exit 1
HOST="$1"
INTERFACE="$2"
AUTHPASS="tropic shark reefs"
USER="random"
PRIVPASS="equ5xerhiffid7klevuk"
RRDFILES="/home/mischa/rrd"
WATERMARK="OpenBSD Amsterdam - https://obsda.ms"
IMAGES="/var/www/rrdtool/obsda.ms"
RRDTOOL="/usr/local/bin/rrdtool"
UPTIME=$(cat /tmp/${HOST}-uptime.txt)
VERSION=$(cat /tmp/${HOST}-version.txt)
NOW=$(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=$(snmp walk -A "${AUTHPASS}" -l authPriv -u ${USER} -X "${PRIVPASS}" ${HOST} ifInOctets.${INTERFACE} | awk '{print $4}')
OUT=$(snmp walk -A "${AUTHPASS}" -l authPriv -u ${USER} -X "${PRIVPASS}" ${HOST} ifOutOctets.${INTERFACE} | awk '{print $4}')
DESCR=$(snmp walk -A "${AUTHPASS}" -l authPriv -u ${USER} -X "${PRIVPASS}" ${HOST} ifDescr.${INTERFACE} | awk '{print $4}')

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

${RRDTOOL} graph ${IMAGES}/${HOST}-${INTERFACE}.png \
	--start -43200 \
	--title "${HOST} - ${VERSION} - ${DESCR}" \
	--vertical-label "Bits per Second" \
	--watermark "${WATERMARK}" \
	--color BACK#ffffff \
	--border 0 \
	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}"