Nagios/Icinga hardware monitor check

check_hwmon

#!/bin/bash

export LANG=C
export LC_ALL=C

R=3
WC=0
CC=0

IGN=$1

PD='|'
MS=''

for d in /sys/class/hwmon/hwmon*
do
  cd $d
  ls device/*_input >/dev/null 2>/dev/null && cd device
  N=$(cat name 2>/dev/null || echo $(basename $(readlink -f .)))
  for i in *_input
  do
    [ "x$i" == 'x*_input' ] && continue
    S=${i%_input}
    L=$(cat ${S}_label 2>/dev/null || echo ${N}_${S})
    V=$(cat $i)
    F=1
    case $i in
      fan*) ;;
      temp*) F=1000;;
      in*) F=1000;;
    esac
    CV=$(perl -E "say $V/$F")
    WN=""
    CR=""
    MX=""
    MN=""
    CCMIN=""
    CCMAX=""
    CWMAX=""
    CCCRI=""

    # read and compute min, max, crit values
    if [ -e ${S}_min -a -e ${S}_max ]
    then
      CCMIN=$(cat ${S}_min)
      CCMAX=$(cat ${S}_max)
      if [ "$CCMIN" == 0 -a "$CCMAX" == 0 ]
      then
        # discard bogus values
        CCMIN=""
        CCMAX=""
      else
        MN=$(perl -E "say $CCMIN/$F")
        MX=$(perl -E "say $CCMAX/$F")
        CR="$MN:$MX"
      fi
    elif [ -e ${S}_crit ]
    then
      CCCRI=$(cat ${S}_crit 2>/dev/null)
      CR=$(perl -E "say $CCCRI/$F")
      if [ -e ${S}_max ]
      then
        CWMAX=$(cat ${S}_max 2>/dev/null)
        WN=$(perl -E "say $CWMAX/$F")
      fi
    elif [ -e ${S}_max ]
    then
      CCCRI=$(cat ${S}_max 2>/dev/null)
      if [ "x$CCCRI" == "x0" ]
      then
        CCCRI=""
      else
        CR=$(perl -E "say $CCCRI/$F")
      fi
    fi

    PD="$PD${N}_${S}=${CV};${WN};${CR}; "

    echo $IGN | grep -q "${N}_${S}" && continue

    # check warn/crit values
    if [ $CCMIN ]
    then
      if [ $CCMIN -ge $V ] ; then
        MS="${MS}, (CRITICAL) $L too low ($CV <= $MN)"
        CC=$((CC+1))
      fi
    fi
    if [ $CCMAX ]
    then
      if [ $CCMAX -le $V ] ; then
        MS="${MS}, (CRITICAL) $L too high ($CV >= $MX)"
        CC=$((CC+1))
      fi
    fi
    if [ $CCCRI ]
    then
      if [ $CCCRI -le $V ] ; then
        MS="${MS}, (CRITICAL) $L too high ($CV >= $CR)"
        CC=$((CC+1))
      fi
    fi
    if [ $CWMAX ]
    then
      if [ $CWMAX -le $V ] ; then
        MS="${MS}, (WARNING) $L too high ($CV >= $WN)"
        CW=$((CW+1))
      fi
    fi
  done
done

if [ $CC -gt 0 ]
then
  R=2
  MS="CRITICAL$MS"
elif [ $WC -gt 0 ]
then
  R=1
  MS="WARNING$MS"
else
  R=0
  MS="OK$MS"
fi

echo $MS$PD
exit $R