Get SSHFP record

get-sshfp.sh

#!/bin/bash
set -euo pipefail

print_usage() {
  printf "Usage: %s <fully qualified domain names>...\n" "$(basename "$0")"
  exit 1
}

if [[ "$#" -lt 1 ]]; then
  print_usage
fi

signatures=$(ssh-keyscan "$@" 2> /dev/null)
if [[ "${signatures}" == "" ]]; then
  exit 1
fi

array=()

while IFS= read -r line; do
  domain=$(echo "${line}" | cut -d " " -f 1)
  signature=$(echo "${line}" | cut -d " " -f "2-")
  dns_rr=$(ssh-keygen -r "${domain}" -f <(echo "${signature}"))
  while IFS= read -r rr; do
    array+=("${rr}")
  done <<< "${dns_rr}"
done <<< "${signatures}"

IFS=$'\n'
echo "${array[*]}"