#!/bin/sh
#
# Copyright (c) 2018 Babak Farrokhi.  All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
#
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. 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.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
#
# 
# Magic markers:
#%# family=auto
#%# capabilities=autoconf


SCRIPT_NAME=$(basename $0)
STAT_TYPE=`echo $SCRIPT_NAME | sed -n s/pf_//p`
PFCTL="/sbin/pfctl"


STATFILE=`mktemp -t pf`
${PFCTL} -vsi > ${STATFILE} 2>/dev/null

print_config()
{
    local fname=$1; shift;
    local fdesc=$1; shift;
    local ftype=$1; shift;

    echo "${fname}.label ${fdesc}"
    echo "${fname}.draw LINE1"
    echo "${fname}.type ${ftype}"
    echo "${fname}.min 0"
}

if [ "$1" == "autoconf" ]; then
    ${PFCTL} -si  >/dev/null 2>&1  && echo yes || echo no
    exit 0

elif [ "$1" == "config" ]; then

    LIMITFILE=`mktemp -t pf`
    ${PFCTL} -vsm > ${LIMITFILE} 2>/dev/null
    MAX_STATES=`cat ${LIMITFILE} | grep "^states" | awk '{print $4}'`
    MAX_SRC=`cat ${LIMITFILE} | grep "^src-nodes" | awk '{print $4}'`
    rm ${LIMITFILE}

    echo "graph_title Firewall State Counters"
    echo "graph_args --lower-limit 0 --base 1000"
    echo "graph_category firewall"
		
    print_config "state" "current" "GAUGE"
    echo "state.critical ${MAX_STATES}"

    print_config "state_searches" "search" "DERIVE"
    print_config "state_inserts" "insert" "DERIVE"
    print_config "state_removals" "removal" "DERIVE"

    print_config "source" "current" "GAUGE"
    echo "source.critical ${MAX_SRC}"
		
    print_config "source_searches" "search" "DERIVE"
    print_config "source_inserts" "insert" "DERIVE"
    print_config "source_removals" "removal" "DERIVE"
		
    for i in `grep "^Counters" -A15 ${STATFILE} | tail -15 | awk '{print $1}' `; do
        print_config "counter_${i}" ${i} "DERIVE"
    done	

else
    grep "^State Table" -A4 ${STATFILE} | grep "current" | awk '{print "state.value "$3}'
    grep "^State Table" -A4 ${STATFILE} | tail -3 | awk '{print "state_"$1".value",$2}'
    grep "^Source Tracking Table" -A4 ${STATFILE} | grep "current" | awk '{print "source.value "$3}'
    grep "^Source Tracking Table" -A4 ${STATFILE} | tail -3 | awk '{print "source_"$1".value",$2}'
    grep "^Counters" -A15 ${STATFILE} | tail -15 | awk '{print "counter_"$1".value",$2}'

fi

rm ${STATFILE}