#!/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 UDP 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/udp_//p`
NETSTAT="/usr/bin/netstat"


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


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

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

if [ $# -lt 1 ]; then


  case ${STAT_TYPE} in
    traffic)
		awk '
/datagrams received/{print "received.value "$1};
/ delivered$/		{print "delivered.value "$1};
/datagrams output/	{print "sent.value "$1}
' ${STATFILE}
		;;
    errors)
		awk '
/incomplete header/		{print "incomplete_header.value "$1};
/bad data length field/	{print "bad_datalen.value "$1};
/bad checksum/			{print "bad_checksum.value "$1}; 
/with no checksum/		{print "no_checksum.value "$1}; 
/due to no socket/		{print "nosock_drop.value "$1}; 
/due to full socket/	{print "nobuf_drop.value "$1};
/not for hashed pcb/	{print "nothashed.value "$1};
' ${STATFILE}
		;;
  esac 


elif [ "$1" == "suggest" ]; then   
   echo "traffic"
   echo "errors"

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

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

  case ${STAT_TYPE} in
    traffic)
		echo "graph_title UDP Traffic"
		echo "graph_args --lower-limit 0 --base 1000"
		echo "graph_vlabel datagrams / second in (+) / out (-)"
		echo "graph_category protocols"

		echo "received.label Traffic In/Out"
		echo "received.type DERIVE"
		echo "received.min 0"
		echo "received.graph no"

		echo "delivered.label Delivered"
		echo "delivered.type DERIVE"
		echo "delivered.min 0"

		echo "sent.label Traffic In/Out"
		echo "sent.type DERIVE"
		echo "sent.min 0"
		echo "sent.negative received"
	;;
    errors)
		echo "graph_title UDP Errors"
		echo "graph_args --lower-limit 0 --base 1000"
		echo "graph_vlabel datagrams / second"
		echo "graph_category protocols"

		print_config "incomplete_header" "Incomplere header"
		print_config "bad_datalen" "Bad data length"
		print_config "bad_checksum" "Bad checksum"
		print_config "no_checksum" "No checksum"
		print_config "nosock_drop" "Dropped due to no socket"
		print_config "nobuf_drop" "Dropped due to full socket buffer"
		print_config "nothashed" "Not hashed for PCB"
	;;
  esac

fi

rm ${STATFILE}