#!/bin/sh
#
# OpenBSD's pf(4) monitoring for OpenBSD
# 2007, Originally by Gergely Czuczy <phoemix@harmless.hu>
# for FreeBSD systems. Ported and splitted by the
# immerda admin team admin(at)immerda.ch
# this version is adapted for openbsd and is only tested on
# openbsd systems.
#
# Needs to run as root.
# Add "user root" for the [pf] into plugins.conf.
#
# Options:
#  - env.do_searches yes: to enable state table search monitoring`
#
#%# family=auto
#%# capabilities=autoconf

pfctl='/sbin/pfctl'

case $1 in
    config)
    cat <<EOF
graph_title OpenBSD pf statistics
graph_vlabel Entries per second
graph_scale no
graph_category network
graph_args -l 0
graph_info OpenBSD's pf usage statistics
EOF
    cat <<EOF
matches.label Matches
matches.min 0
matches.type DERIVE
mismatches.label State mismatches
mismatches.min 0
mismatches.type DERIVE
blocks.label Blocked packets
blocks.type DERIVE
blocks.min 0
EOF
    exit 0
    ;;
    autoconf)
	# FreeBSD
	ostype=`uname -s`
	if [ ${ostype} = "FreeBSD" ]; then
	    # pf(4) module loaded?
	    if [ `kldstat -v | grep pf | wc -l` -eq 0 ]; then
		echo "no (pf(4) is not loaded)"
		exit 0
	    fi
	    # enabled?
	    if [ `pfctl -si 2>/dev/null | awk '/^Status:/{print $2}'` != "Enabled" ]; then
		echo "no (pf(4) is not enabled, consult pfctl(8)"
		exit 0
	    fi
	# OpenBSD
	elif [ ${ostype} = "OpenBSD" ]; then
            # enabled?
	    if [ `pfctl -si 2>/dev/null | awk '/^Status:/{print $2}'` != "Enabled" ]; then
		echo "no (pf(4) is not enabled, consult pfctl(8)"
		exit 0
	    fi
	# Other OSes
	else
	    echo "no (this plugin is not supported on your OS)"
	    exit 0
	fi
	echo "yes"
	exit 0
	;;
    suggest)
	exit 0;
	;;
esac

#
${pfctl} -si 2>/dev/null | awk '
$1~/^match$/{print "matches.value",$2}
/state-mismatch/{print "mismatches.value",$2}'
${pfctl} -vsr 2> /dev/null| grep -A 1 ^block | awk 'BEGIN {sum=0}/^[ \t]*\[/{sum=sum+$5} END {print "blocks.value",sum}'