#!/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.
#
#
# 10-Aug-2015 @farrokhi
# This script extracts IP traffic statistics from "netstat -s" 
# 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/ip_//p`
NETSTAT="/usr/bin/netstat"


STATFILE=`mktemp -t ip`
${NETSTAT} -s -p ip> ${STATFILE} 2>/dev/null


print_config()
{
	local fname=$1; shift;
	local fdesc=$1; shift;
	local color=$1; shift;
	local draw=${1-"LINE1"}; shift;

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

	if [ ! -z ${color} ]; then
		echo "${fname}.colour ${color}"
	fi	
}

if [ $# -lt 1 ]; then


  case ${STAT_TYPE} in
    forwarding)
		awk '
/packets forwarded/ {
	fast=$4;
	gsub(/\(/, "", fast);
	print "forwarded.value "$1;
	print "fastforwarded.value "fast;
	};
' ${STATFILE}
		;;
    drops)
		awk '
/output packets dropped due/		{print "nobuf_drop.value "$1};
' ${STATFILE}
		;;
	host)
		awk '
/packets for this host/ {			print "hostrecvd.value "$1};
/packets sent from this host/ {		print "hostsent.value "$1};
' ${STATFILE};	
		;;
  esac 

elif [ "$1" == "suggest" ]; then   
   echo "forwarding"
   echo "drops"
   echo "host"

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

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

  case ${STAT_TYPE} in
    forwarding)
		echo "graph_title IP Forwarding"
		echo "graph_args --lower-limit 0 --base 1000"
		echo "graph_vlabel packet / second"
		echo "graph_category protocols"

		print_config "fastforwarded" "Fast Forwarded" COLOUR18 AREA
		print_config "forwarded" "Forwarded" COLOUR10 LINE2
	;;
    drops)
		echo "graph_title IP Output Drops"
		echo "graph_args --lower-limit 0 --base 1000"
		echo "graph_vlabel packets / second"
		echo "graph_category protocols"

		print_config "nobuf_drop" "Output drop due to no buf" COLOUR15 LINE2
	;;
	host)
		echo "graph_title Local Packets"
		echo "graph_args --lower-limit 0 --base 1000"
		echo "graph_vlabel packets / second"
		echo "graph_category protocols"

		print_config "hostrecvd" "Packets received for this host" 
		print_config "hostsent"  "Packets sent from this host"
	;;
  esac

fi

rm ${STATFILE}