#!/bin/bash
#    This program is free software; you can redistribute it and/or modify
#    it under the terms of the GNU General Public License as published by
#    the Free Software Foundation; either version 2 of the License, or
#    (at your option) any later version.
#
#    This program is distributed in the hope that it will be useful,
#    but WITHOUT ANY WARRANTY; without even the implied warranty of
#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#    GNU General Public License for more details.
#
#    You should have received a copy of the GNU General Public License
#    along with this program; if not, write to the Free Software
#    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
#
# Written by Daniele Albrizio <daniele@albrizio.it> march 2014
# Requires dhcpd-pools - ISC dhcpd pools usage analysis http://dhcpd-pools.sourceforge.net/
#
####
#%# family=manual
#%# capabilities=autoconf,multigraph

export WARN=85
export CRIT=98
DHCPD_POOLS_BIN=/usr/local/bin/dhcpd-pools
DHCPDCONF=/etc/dhcp3/dhcpd.conf


if [ "$1" = "autoconf" ]; then
        echo yes
        exit 0
fi

$DHCPD_POOLS_BIN -c $DHCPDCONF --minsize=15 --limit=01 -fc  | grep -v "^$" | sort | sed 's/","/\t/g' | sed 's/"//g' |\
while read SCOPENAME IPSTART IPSTOP POOLMAX POOLCUR PERCENT TOUCH TC TCPERCENT BU BUPERCENT
do
    IPSTARTUS=`echo $IPSTART | sed 's/\./_/g'`
    let POOLWARN=${POOLMAX}*${WARN}/100
    let POOLCRIT=${POOLMAX}*${CRIT}/100
    let GRAPHTOP=${POOLMAX}*110/100
    if [ "$1" = "config" ]; then
        echo "multigraph ${SCOPENAME}_$IPSTARTUS"
        echo "graph_title $SCOPENAME $IPSTART -> $IPSTOP (${POOLMAX})"
        echo "graph_args --base 1000 -l 0 --upper-limit $GRAPHTOP"
        echo "graph_vlabel Active Leases"
        echo "graph_scale no"
        echo "graph_category network"

        echo "pool.label $SCOPENAME Active Leases"
        echo "pool.info Pool utilization"
        echo "pool.type GAUGE"
        echo "pool.min 0"
        echo "pool.max $POOLMAX"
        echo "pool.colour 00ff00"
        echo "pool.draw AREA"
        echo "pool.warning $POOLWARN"
        echo "pool.line $POOLWARN:ffc000:$WARN%"
        echo "pool.critical $POOLCRIT"
        echo "pool_fover.label Peer available leases"
        echo "pool_fover.colour aaaaaa"
        echo "pool_fover.draw LINESTACK1"
        echo "pool_fover.type GAUGE"
        echo "pool_fover.line $POOLCRIT:ff0000:$CRIT%"
        echo "#"
    else
        echo "multigraph ${SCOPENAME}_$IPSTARTUS"
        echo "pool.value $POOLCUR"
        echo "pool_fover.value $BU"
    fi
done