Queries an FQDN for a record type a certain amount of times, and lists the received statuses

dns-query-loop.sh

#!/usr/bin/env bash

set -Eefuo pipefail
IFS=$'\n\t'

# Set these vars first
host="${1}"
record_type="${2}"
request_limit=5

declare -A status_count

run_dig() {
  dig ${host} ${record_type} 2>&1 | grep -oP "(?<=status: )\w+"
}

print_totals() {
  echo -en '\n---\n\n'

  for status_type in "${!status_count[@]}"; do
    echo "${status_type}:" "${status_count[$status_type]}/${request_limit}"
  done
}

trap print_totals ERR EXIT

echo -en "Running ${request_limit} DNS queries...\n\n"

for (( count=0; count<request_limit; count++ )); do
  result="$(run_dig)"

  if [[ -z "${status_count[${result}]:-}" ]]; then
    status_count[${result}]=0
  fi

  # shellcheck disable=SC2149
  status_count[${result}]=$(( status_count[${result}] + 1))
  sleep 1
done

echo "Finished all DNS queries."

Created to reproduce a bug in Cloudflare's nameservers, because they keep returning SERVFAIL's for queries for the SOA record of a CNAME'd hostname.