Nagios script that raises an critical after X grace period of time.

check_http_alt

#!/bin/bash
# Nagios script that raises an critical after X grace period of time.
# curl -x my.super.lan:223 http://foo.bar -s --connect-timeout 10

print_usage() {
  echo -n '
 Options:
  -u, --url             URL to check
  -x, --proxy           Proxy server 
  -p, --port            Proxy port
  -g, --grace-period    Grace period since the first failing connection before
                        raising a Critical alert
  -h, --help            Display this help and exit
  -v, --verbose         Print full output of the request
'
}

print_help() {
  print_usage
}

do_request(){
  if [ -n "$1" ];then
    p_port=":$1"
  fi
  
  time_total=`curl $proxy_option $proxy$p_port $url $silence --connect-timeout 10 $redirection_option $redirection_path -w "%{time_total}"`
  curl_status=$?

  if [ $curl_status -eq 0 ]; then
    [ -n "$1" ] && echo "${1}:${time_total}" || echo $time_total
    return $STATE_OK
  else
    [ -n "$1" ] && echo "${1}:err_code_$curl_status" || echo "err_code_$time_total"

    return $STATE_CRITICAL
  fi
}

STATE_OK=0
STATE_WARNING=1
STATE_CRITICAL=2
STATE_UNKNOWN=3

while test -n "$1"; do
  case "$1" in
    --help|-h)
      print_help
      exit $STATE_OK
      ;;
    --proxy|-x) proxy="$2"
      shift
      ;;
    --port|-p) port="$2"
      shift
      ;;
    --url|-u) url="$2"
      shift
      ;;
    --grace-period|-g) grace_period="$2"
      shift
      ;;
    --verbose|-v) verbose=true
      shift
      ;;
    *)
      echo "Unknown argument: $1"
      print_usage
      exit $STATE_UNKNOWN
      ;;
  esac
shift
done



if [ -z "${grace_period}" ] ||
   [ -z "${url}" ]; then
 echo "Specify more parameters..."
 print_usage
 exit $STATE_UNKNOWN
fi 


if [ $verbose ]; then
  silence='-v'
  redirection_option=''
  redirection_path=''
else
  silence='-s'
  redirection_option='-o'
  redirection_path='/dev/null'
fi



if [ $proxy ]; then
  if [ -z "${port}" ]; then
   echo "Specify more parameters..."
   print_usage
   exit $STATE_UNKNOWN
  fi 
  proxy_option="-x"
else
  proxy_option=''
fi

if [ $port ]; then
  if [ -z "${proxy}" ]; then
   echo "Specify more parameters..."
   print_usage
   exit $STATE_UNKNOWN
  fi 
fi
# String to array
IFS=','
read -ra port_list <<< "$port"


bin_curl='/usr/bin/curl'

counter=0
if [ -z "$port" ]; then
  output=$(do_request $port)
  if [ $? -ne 0 ]; then
    counter=`expr $counter + 1`
  fi

else 
  for single_port in "${port_list[@]}"
  do
    output_=$(do_request $single_port)
    if [ $? -ne 0 ]; then
      counter=`expr $counter + 1`
    fi
    output="$output $output_"
  done
fi

md5sum_hash=$(echo $url $proxy_host $port | md5sum | cut -d ' ' -f 1)
temp_file="/tmp/proxy_${md5sum_hash}"

ports_number=`echo ${port_list[@]}| wc -w`
if [ $ports_number -eq $counter ]; then
  if [ ! -f $temp_file ]; then
    echo "CRITICAL: $output"
    exit $STATE_CRITICAL
  fi 
  mtime_file=`stat -c %Y  ${temp_file}`
  current_time=`date +%s`
  diff_time=`expr $current_time - $mtime_file`
  if [ $diff_time -gt $grace_period ];then
    echo "CRITICAL: $output"
    exit $STATE_CRITICAL
  else
    echo "WARNING: $output"
    exit $STATE_WARNING
  fi

elif [ $counter -ne 0 ]; then
  echo "WARNING: $output"
  exit $STATE_WARNING

else 
  touch $temp_file
  echo "OK: $output"
  exit $STATE_OK
fi