#!/bin/sh
#
# Copyright (c) 2016 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.
#
# 
# 04-Aug-2015 @farrokhi
# This script extracts pf firewall statistics from from "pfctl -vsi" 
# on FreeBSD and feeds to munin
#
# Magic markers:
#%# family=auto
#%# capabilities=autoconf suggest


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;

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


if [ $# -lt 1 ]; then

  case ${STAT_TYPE} in
    state)
		cat ${STATFILE} | grep "^State Table" -A4 | grep "current" | awk '{print "state.value "$3}'
		;;
    state_act)
		cat ${STATFILE} | grep "^State Table" -A4 | tail -3 | awk '{print "state_"$1".value",$2}'
		;;
    source)
		cat ${STATFILE} | grep "^Source Tracking Table" -A4 | grep "current" | awk '{print "source.value "$3}'
		;;
    source_act)
		cat ${STATFILE} | grep "^Source Tracking Table" -A4 | tail -3 | awk '{print "source_"$1".value",$2}'
		;;
    counters)
		cat ${STATFILE} | grep "^Counters" -A15 | tail -15 | awk '{print "counter_"$1".value",$2}'
		;;
  esac 


elif [ "$1" == "suggest" ]; then   
   echo "state"
   echo "state_act"
   echo "source"
   echo "source_act"
   echo "counters"

elif [ "$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}


  case ${STAT_TYPE} in
    state)
		echo "graph_title State Table Entries"
		echo "graph_args --lower-limit 0 --base 1000"
		echo "graph_vlabel states"
		echo "graph_category firewall"

		echo "state.label current"
		echo "state.critical ${MAX_STATES}"
	;;
    state_act)
		echo "graph_title State Table Activity"
		echo "graph_args --lower-limit 0 --base 1000"
		echo "graph_vlabel actions / second"
		echo "graph_category firewall"

		print_config "state_searches" "search"
		print_config "state_inserts" "insert"
		print_config "state_removals" "removal"
	;;
    source)
		echo "graph_title Source Tracking Table Entries"
		echo "graph_args --lower-limit 0 --base 1000"
		echo "graph_vlabel sources"
		echo "graph_category firewall"

		echo "source.label current"
		echo "source.min 0"
		echo "source.critical ${MAX_SRC}"
	;;
    source_act)
		echo "graph_title Source Tracking Table Activity"
		echo "graph_args --lower-limit 0 --base 1000"
		echo "graph_vlabel actions / second"
		echo "graph_category firewall"

		print_config "source_searches" "search"
		print_config "source_inserts" "insert"
		print_config "source_removals" "removal"
	;;
    counters)
		echo "graph_title Misc Counters"
		echo "graph_args --lower-limit 0 --base 1000"
		echo "graph_vlabel actions / second"
		echo "graph_category firewall"

		for i in `cat ${STATFILE} | grep "^Counters" -A15 | tail -15 | awk '{print $1}' `; do
			print_config "counter_${i}" ${i}
		done	
	;;
  esac

fi

rm ${STATFILE}