#!/bin/sh

EXCLUDE_REGEXP='(lo|bond|vmbr)'

#
# Help function
#
usage() {
	cat <<EOF
This script simply outputs the number of packets and volume of data
emitted and received by network devices. Its status is always 0/OK.

Usage :
  $0 [-e egrep_exclude_pattern]

Example :
  $0 -e '(lo|^br-|^veth)'

Default values:
	egrep_exclude_pattern: $EXCLUDE_REGEXP
EOF
}

#
# Loop on parameters + tests
#
while getopts he: f; do
	case "$f" in
		'h')
			usage
			exit
			;;

		'e')
			EXCLUDE_REGEXP="$OPTARG"
			;;

		\?)
			usage
			exit 1
			;;
	esac
done


# We don't bother buffering, let's output as we go
printf "OK |"

# Loop on each device
for i in $( cat /proc/net/dev | sed -n 's/^[[:space:]]*\([a-z0-9\.\-]\+\):.*/\1/p' | sort ); do
	if [ $( echo "$i" | egrep -c -e "$EXCLUDE_REGEXP" ) -gt 0 ]; then
		continue
	fi
	VOLUME_RECU="$( cat /proc/net/dev | sed -n "s/^[[:space:]]*$i:[[:space:]]*//p" | sed 's/[[:space:]]\+/ /g' | cut -d " " -f 1 )"
	VOLUME_EMIS="$( cat /proc/net/dev | sed -n "s/^[[:space:]]*$i:[[:space:]]*//p" | sed 's/[[:space:]]\+/ /g' | cut -d " " -f 9 )"
	PAQUETS_RECUS="$( cat /proc/net/dev | sed -n "s/^[[:space:]]*$i:[[:space:]]*//p" | sed 's/[[:space:]]\+/ /g' | cut -d " " -f 2 )"
	PAQUETS_EMIS="$( cat /proc/net/dev | sed -n "s/^[[:space:]]*$i:[[:space:]]*//p" | sed 's/[[:space:]]\+/ /g' | cut -d " " -f 10 )"
	printf " %s_packets_in=%d %s_packets_out=%d %s_volume_in=%d %s_volume_out=%d" "$i" "$PAQUETS_RECUS" "$i" "$PAQUETS_EMIS" "$i" "$VOLUME_RECU" "$i" "$VOLUME_EMIS"
done

printf "\n"