Cert expiration check from dns zone file

Tool

https://github.com/genkiroid/cert

https://github.com/genkiroid/cert/releases

git clone https://github.com/genkiroid/cert
cd cmd/cert
go build -o cert
if you want to build it from source using golang

Loop/parse zone file

#!/bin/bash
# DNS zone files must be in $domain.zone file format
set -eu

if [ "$#" -ne 1 ]; then
  echo "Usage: $0 <domain>"
  echo "Example: $0 mktp.io"
  exit
fi
  domain=$1
  sleep_seconds=1

  for i in $(sed '/;  Zone records/,$!d' ${domain}.zone | sed '1,3d' | awk '{print $1}'); do
  # for i in $(cat ${domain}.zone | awk '{print $1}'); do
  cert ${i}.${domain}
  sleep ${sleep_seconds}
done