#!/bin/bash
# Name: report-hosts-notresponding.sh
# Description: Report Systems That Don't Respond to Ping
# Last Modified: 2018-05-31
# Recent Changes:-Initial release
###############################################################################################

##### Customize These Variables #####
# IPA admin user
admin_user="admin"

# Ping command to use (1 packet, 3 second timeout)
ping_cmd='ping -c 1 -W 3'
##### End of Customize Variables #####

#=====================================
# Functions; Main starts after
#=====================================
function show_usage
{
  echo -e "\n==== Report: Systems Not Responding ===="
  echo -e "\nDescription: Report systems that are not responding to ping."
  echo -e "\n--Usage--"
  echo -e "./report-hosts-notresponding.sh [OPTIONS]"
  echo -e "\n-OPTIONS-"
  echo -e "-h                    => Display usage."
  echo -e "-v                    => Verbose; extra status output."
  echo -e "\n--Other Requirements--"
  echo -e "-> FreeIPA admin access."
  echo -e
}

#=======================
# Get Script Arguments
#=======================
# Reset POSIX variable in case it has been used previously in this shell
OPTIND=1

# By default, do not output verbose
verbose_mode="no"

while getopts "hv" opt; do
  case "${opt}" in
    h) # -h (help) argument
      show_usage
      exit 0
    ;;
    v) # -v (verbose) argument
      verbose_mode="yes"
    ;;
    *) # invalid argument
      show_usage
      exit 0
    ;;
  esac
done

#===================
# Pre-checks: Make sure we have good options set
#===================
# See if we have a kerberos ticket, if not, prompt login
/usr/bin/klist -s
if [[ $? -ne 0 ]]; then
  echo ">>No kerberos ticket found for (${admin_user}), login as ${admin_user} now:"
  /usr/bin/kinit ${admin_user}
  echo
fi

#===================
# Main starts here
#===================
echo -e "==========================================================="
echo -e "####========= Report: Systems Not Responding ==========####"
echo -e "==========================================================="
echo
echo -e "This script will report all systems that are not responding to ping."
if [[ ${verbose_mode} == "yes" ]]; then
  echo -e "Verbose: Yes"
else
  echo -e "Verbose: No"
fi
echo -e "=>Continue?[y/n]:\c"
read run_script

if [[ ${run_script} != "y" ]]; then
  echo -e "\n>>Will not run the script. Exiting..."
  exit 1
fi

# Get all systems
echo -e ">> Getting all systems."
all_systems="$(ipa host-find --sizelimit=0 --in-hostgroups='' | grep "Host" | awk '{print $3}')"

# Initialize lists to nothing
systems_not_reachable=""
systems_no_dns=""
systems_other_error=""

echo -e ">> Pinging ($(echo ${all_systems} | wc -w)) systems\c"
if [[ ${verbose_mode} == "yes" ]]; then
  # Extra newline required if verbose messages (due to \c above)
  echo
fi

# Loop through all systems, create list that don't respond to ping
for system in ${all_systems}; do

  if [[ ${verbose_mode} == "yes" ]]; then
    echo "--> Ping system: ${system}"
  else
    # Not verbose, output a single '.' per system ping
    echo -e ".\c"
  fi

  ${ping_cmd} ${system} &> /dev/null
  return_code="$?"

  if [[ ${return_code} == "0" ]]; then
    # Got a successful reply, continue on
    if [[ ${verbose_mode} == "yes" ]]; then
      echo "---Ok"
    else
      # Do nothing ':' (equivalent to Python's 'pass')
      :
    fi

  elif [[ ${return_code} == "1" ]]; then
    # Host not reachable
    if [[ ${verbose_mode} == "yes" ]]; then
      echo "---Warning: Host is unreachable. (${system})"
    fi
    systems_not_reachable+="${system} "

  elif [[ ${return_code} == "2" ]]; then
    # Name not known
    if [[ ${verbose_mode} == "yes" ]]; then
      echo "---Warning: Name not known/no longer in DNS. (${system})"
    fi
    systems_no_dns+="${system} "

  else
    # Some other error occurred
    if [[ ${verbose_mode} == "yes" ]]; then
      echo "---Warning: Some other error occurred. (${system})"
    fi
    systems_other_error+="${system} "
  fi
done

if [[ ${verbose_mode} == "no" ]]; then
  # Extra space required if not verbose because of no newlines for '.' status output
  echo -e "[Done]"
fi

echo -e "\n----------------------------------------"
echo -e "---- Systems Not Responding To Ping ----"
echo -e "----------------------------------------"

echo -e "\n>> Hosts Unreachable (But in DNS): $(echo ${systems_not_reachable} | wc -w)"
for system in ${systems_not_reachable}; do
  echo -e "${system}"
done

echo -e "\n>> Hosts With Name Not Known (Not in DNS): $(echo ${systems_no_dns} | wc -w)"
for system in ${systems_no_dns}; do
  echo -e "${system}"
done

echo -e "\n>> Hosts with some other type of error: $(echo ${systems_other_error} | wc -w)"
for system in ${systems_other_error}; do
  echo -e "${system}"
done

echo -e "\n==============================================="
echo -e "=- Report: Systems Not Responding Completed. -="
echo -e "==============================================="