Munin contributed plugins

#! /bin/sh

pluginfull="$0"			# full name of plugin

plugin="${0##*/}"		# name of plugin

pidfile="$MUNIN_PLUGSTATE/munin.$plugin.pid"

cache="$MUNIN_PLUGSTATE/munin.$plugin.value"

IFACE="${0##*/if1sec_}"		# interface

if [ ! -r "/sys/class/net/$IFACE/statistics/tx_bytes" ]

then

	echo "# Unknown Interface : $IFACE"

	exit 1

fi

if [ "$1" = "acquire" ]

then

	(

		exec <&- >&- 2>&-

		while sleep 1

		do

			read tx < /sys/class/net/$IFACE/statistics/tx_bytes

			read rx < /sys/class/net/$IFACE/statistics/rx_bytes

			echo "$tx $rx"

		done | awk "{

				now = systime()

				print \"${IFACE}_tx.value \" now \":\" \$1

				print \"${IFACE}_rx.value \" now \":\" \$2

				system(\"\")

			}" >> $cache

	) &

	echo $! > $pidfile

	exit 0

fi

if [ "$1" = "config" ]

then

	cat <<EOF

graph_title Interface 1sec stats for ${IFACE}

graph_category network

graph_data_size custom 1d, 10s for 1w, 1m for 1t, 5m for 450d

graph_vlabel bits/sec

update_rate 1

${IFACE}_tx.label ${IFACE} TX bits

${IFACE}_tx.cdef ${IFACE}_tx,8,*

${IFACE}_tx.type DERIVE

${IFACE}_tx.min 0

${IFACE}_rx.label ${IFACE} RX bits

${IFACE}_rx.cdef ${IFACE}_rx,8,*

${IFACE}_rx.type DERIVE

${IFACE}_rx.min 0

EOF

	# If max speed is easily available, report it.	More complex

	# code could be copied from "if_".

	if [ -r /sys/class/net/$IFACE/speed ]

	then

		SPEED=$(cat /sys/class/net/$IFACE/speed)

		echo "${IFACE}_rx.max" $((SPEED / 8 * 1000000))

		echo "${IFACE}_tx.max" $((SPEED / 8 * 1000000))

		echo "${IFACE}_rx.info Received traffic on the $IFACE interface. Maximum speed is ${SPEED} Mbps."

		echo "${IFACE}_tx.info Transmitted traffic on the $IFACE interface. Maximum speed ${SPEED} Mbps."

	fi

	exit 0

fi

# Autorun logic

running=true

if [ ! -e ${cache} ]

then

	# no cache file

	running=false

elif [ ! -s ${cache} ]

then

	# empty cache file

	if [ -s ${pidfile} ]

	then

		# kill -0 will return success if this user is allowed to send

		# a signal to the process.  This means the PID exists and

		# belongs to the plugin user, which should have few false

		# positives.

		if ! kill -0 $(cat ${pidfile})

		then

			running=false

		fi

	else

		running=false

	fi

fi

if ! $running

then

	$0 acquire &

	# wait a little so we have some data to report

	sleep 3

fi

# Finally: Print collected values, truncate to mark spot.

cat ${cache}

> ${cache}

exit 0