zabbix_netstat

#!/bin/bash
#
# Zabbix agent extension for monitoring interfaces in /proc/net/dev

BUFFER=/tmp/zabbix-netstat
SOFTWARE="jo"

function discover_interfaces() {
   jo -p data=$( jo -a $(
   tail -n+3 /proc/net/dev | cut -d: -f1 | sort -u | while read interface
   do
      jo {\#INTERFACE}=${interface}
   done ) )
}

function getdata() {
   mkdir $BUFFER.$$; chmod 750 $BUFFER.$$
   cd $BUFFER.$$

   tail -n+3 /proc/net/dev | cut -d: -f1 | sort -u | while read interface
   do
      grep -w $interface /proc/net/dev | while read ifname rx_bytes rx_packets rx_errs rx_drop rx_fifo rx_frame rx_compressed rx_multicast tx_bytes tx_packets tx_errs tx_drop tx_fifo tx_colls tx_carrier tx_compressed
      do
         cat <<-EOF > $interface
				rx_bytes:$rx_bytes
				rx_packets:$rx_packets
				rx_errs:$rx_errs
				rx_drop:$rx_drop
				rx_fifo:$rx_fifo
				rx_frame:$rx_frame
				rx_compressed:$rx_compressed
				rx_multicast:$rx_multicast
				tx_bytes:$tx_bytes
				tx_packets:$tx_packets
				tx_errs:$tx_errs
				tx_drop:$tx_drop
				tx_fifo:$tx_fifo
				tx_colls:$tx_colls
				tx_carrier:$tx_carrier
				tx_compressed:$tx_compressed
			EOF
      done
   done

   test -d $BUFFER && mv $BUFFER $BUFFER.old
   mv $BUFFER.$$ $BUFFER
   rm -rf $BUFFER.old
}

function sanity_check() {
   ok=1
   for prog in $SOFTWARE
   do
      which $prog > /dev/null || { echo "Missing program $prog."; ok=0; }
   done
   test -f $CONFIG || { echo "Missing configfile $CONFIG"; ok=0; }
   test $ok -ne 1 && { echo "Sanity check failed. Aboring." ; exit 1; }
}

sanity_check

action=$1
arg=$2

case "$action" in
    getdata)
        getdata
        ;;
    netstat.discover)
        discover_interfaces
        ;;
    netstat.master)
        test -f $BUFFER/$arg && cat $BUFFER/$arg
        ;;
esac