check_netio

#!/bin/bash
# ======================================================================
#
# Check NETIO to show traffic over all network cards
# data besed on /proc/net/dev 
#
# ----------------------------------------------------------------------
# 2020-07-08  v1.0  <axel.hahn@iml.unibe.ch>
# 2023-08-21  v1.1  <axel.hahn@unibe.ch>      add help; add param -i
# 2023-08-22  v1.2  <axel.hahn@unibe.ch>      send perf data on single interface too; interfaces in alphabetic order; no more tmp file
# 2023-08-22  v1.3  <axel.hahn@unibe.ch>      show status line with 2 digits after "."
# ======================================================================


. $( dirname $0 )/inc_pluginfunctions

export self_APPVERSION=1.2


# ----------------------------------------------------------------------
# FUNCTIONS
# ----------------------------------------------------------------------

# show help text
function showHelp(){
    local _self; _self=$(basename $0)
cat <<EOF
$( ph.showImlHelpHeader )

Show network io for all or selected interfaces.
It shows the current counter value from /proc/net/dev and the speed 
in byte per sec since last execution.

This plugin sends performancedata.

SYNTAX:
  $_self [-h] [-i INTERFACE(S)]

OPTIONS:
  -h               this help

PARAMETERS:
  -i  INTERFACE    show this interface only. Quote multiple interfaces.
                   The check returns unknown if an interface does not
                   exist.

EXAMPLES:

  $_self      show netio of all network interfaces
  $_self -i "eth0 eth1" 
                   show netio of given interfaces.

EOF
}

# ----------------------------------------------------------------------
# MAIN
# ----------------------------------------------------------------------

bOptHelp=$( ph.hasParamoption "h" "$@")

if [ $bOptHelp -eq 1 ]; then
    showHelp
    exit 0
fi

typeset -i iCountInterfaces

typeset -i iRead=0
typeset -i iTrans=0
typeset -i iSpeedRead=0
typeset -i iSpeedTrans=0
typeset -i iTotalRead=0
typeset -i iTotalTrans=0

data=$( cat /proc/net/dev | grep ":" | grep -vE "(lo|bond.*|ppp.*):")

allInterfaces=$( cut -f 1 -d ":" <<< "$data" | tr -d " " )
sInterface=$(   ph.getValueWithParam "$allInterfaces" "i" "$@" | sort )

out="---------- Interfaces:"


# ----- loop over all interfaces
iCountInterfaces=$( wc -w <<< "$sInterface" )

    for myinterface in $sInterface
    do

        line=$( grep "${myinterface}:" <<< "$data" )
        if [ -n "$line" ] ; then

            # echo "SOURCE: $line"

            # total value of byte
            iRead=$( echo "$line" | awk '{ print $2 }')
            iTrans=$(echo "$line" | awk '{ print $10 }')

            # speed in byte per sec based on last stored value and its age
            iSpeedRead=$( ph.perfdeltaspeed "netio-${myinterface}-rx" $iRead)
            iSpeedTrans=$(ph.perfdeltaspeed "netio-${myinterface}-tx" $iTrans)

            out+=$(
                printf "\n>>> %s\n"                 "${myinterface}"
                printf "%15s %15s %10s %-10s \n"  "receive:"   $iRead  $iSpeedRead  "byte/s"
                printf "%15s %15s %10s %-10s \n"  "transmit:"  $iTrans $iSpeedTrans "byte/s"
                echo " "
            )
            ph.perfadd "rx-${myinterface}"   "$iSpeedRead"
            ph.perfadd "tx-${myinterface}"   "$iSpeedTrans"

            iTotalRead=$iTotalRead+$iSpeedRead
            iTotalTrans=$iTotalTrans+$iSpeedTrans
        else
            ph.setStatus "unknown"
            out+=$( printf "\nERROR: The interface [${myinterface}] does not exist." )
        fi

    done

# ----- total
if [ $iCountInterfaces -gt 1 ]; then

    out+=$(
        echo
        echo "---------- total:"
        printf "%15s %10s %-10s \n"  "receive:"   $iTotalRead  "byte/s"
        printf "%15s %10s %-10s \n"  "transmit:"  $iTotalTrans "byte/s"
        echo " "
    )
   
fi
ph.perfadd "rx"   "$iTotalRead"
ph.perfadd "tx"   "$iTotalTrans"

# ----- output
ph.status "Network IO ... IN $(ph.toUnit $iTotalRead M 2 ) MB/s >> [host] >> $(ph.toUnit $iTotalTrans M 2 ) MB/s OUT"

echo "$out"

ph.exit