#!/bin/bash
APPNAME=$(basename $0)

###############################
# Check binaries before start #
###############################


binaries=$(cat<<all_required_binaries
       snmpwalk
all_required_binaries)

for required_binary in $binaries; do
  which $required_binary > /dev/null
  if [ "$?" != '0' ];then
    printf "UNKNOWN: $APPNAME: No usable '$required_binary' binary in '$PATH'\n"
    exit 3
  fi
done



######################
# print Help Message #
######################

usage () {

cat<<EOU

Usage of $APPNAME
---------------------------------------------------------------------

Usable Options:
  -H fileserver
     The Hostname variable, set your hostname instead of fileserver
     (Required option)

  -C public
     The SNMP Community variable, set your SNMP read community here
     (Required Option)
  -h
     This help message

Examples:
  $APPNAME -H fileserver -C public

---------------------------------------------------------------------

EOU
exit 3
}



################################
# Get Options from commandline #
################################

while getopts "C:H:h" option
do
  case $option in
    C ) COMMUNITY=$OPTARG ;;
    H ) HOST=$OPTARG ;;
    h ) usage ;;
  esac
done



###########################################
# Exit Unknown if not all arguments given #
###########################################

if [ -z "$COMMUNITY" ] || [ -z "$HOST" ];then
 printf "UNKNOWN: No hostname and/or community set!"
 exit 3
fi



###########################
# Main part of the script #
###########################

# Execute snmpwalk - Ouput is "FanNumer: Statuscode" #
WALK=$(snmpwalk -v 2c -c $COMMUNITY $HOST .1.3.6.1.4.1.232.6.2.6.7.1.9 | cut -f4 -d ':')
FANSTATUS=$(echo "$WALK" | grep -n [134])

if [ -z "$WALK" ];then
  printf "No proper SNMP response or SNMP timeout. Check host or community string\n"
  exit 3
fi

# Get amount of failed fans #
AMOUNT=$(echo "$FANSTATUS" | grep -o ' ' | wc -l)

# Exit OK if no fan failed
if [ $AMOUNT -eq "0" ];then
 printf "OK: All Fans running"
 exit 0

# General failure if more than one fan failed
elif [ "$AMOUNT" -gt "1" ];then
 printf "CRIT: $AMOUNT fans failed! Check HP Management Homepage"
 exit 2
else

  # Get failed fans index number
  NUMBER=$(echo $FANSTATUS | cut -f1 -d ':')

  # Get Errorcode of failed fan
  CODE=$(echo $FANSTATUS | cut -f2 -d ':')

  # Translate Errorcode
    # Error 1
    if [ $CODE = 2 ];then
     printf "UNKNOWN: 1 (Fan check not supported for this system)"
     exit 3
    fi

    # Error 2
    if [ $CODE = 2 ];then
     DESCR="2 (Fan OK)"
    fi

    # Error 3
    if [ $CODE = 3 ];then
     DESCR="3 (Fan degraded)"
    fi

    # Error 4
    if [ $CODE = 4 ];then
     DESCR="4 (Fan failed)"
    fi

  printf "WARN: Fan Number $NUMBER failed with status $DESCR"
  exit 1
fi