pingcheck.sh

#!/bin/bash

ip=""
ping="NO"
dns=()
timeout=1

while [[ $# -gt 0 ]]; do
  case $1 in
    -p|--ping)
      ping="YES"
      shift
      ;;
    -d|--dns)
      dns+=("$2")
      shift
      shift
      ;;
    -t|--timeout)
      timeout="$2"
      shift
      shift
      ;;
    -*|--*)
      echo "Unknown option ${1}"
      exit 1
      ;;
    *)
      if [ "x${ip}" != "x" ]; then
        echo "Only one IP can be defined"
        exit 1
      fi
      ip="$1"
      shift
      ;;
  esac
done

if [ "x${ip}" == "x" ]; then
  echo "At least one IP must be defined"
  exit 1
fi

if [ "${ping}" == "YES" ]; then
  latency=$(ping -c1 -W"${timeout}" "${ip}" | grep -iE "^rtt")
  if [ $? -eq 0 ]; then
    echo "on"
    echo "${latency}" | awk 'BEGIN {FS="[/]|[ ]"} {print $8}'
  else
    echo -e "off"
    echo ""
  fi
fi

for name in "${dns[@]}"; do
  result=$(host -ttxt -W"${timeout}" "${name}" "${ip}"  | grep -iE "${name}"'\b descriptive text \"SUCCESS!\"')
  if [[ "${result}" == *'"SUCCESS!"' ]]; then
    echo "on"
  else
    echo "off"
  fi
done

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