certbot-hook-dns-auth.sh

#!/bin/bash

### RUNNING:
#certbot certonly -d host.domain.tld --agree-tos --manual --preferred-challenges=dns --manual-auth-hook /root/certbot-hook-dns-auth.sh --manual-public-ip-logging-ok

HOST="_acme-challenge"
DYNZONE="SET_YOURDOMAIN_NAME"

if [ -z "$CERTBOT_DOMAIN" ] || [ -z "$CERTBOT_VALIDATION" ] || [ -z "$DYNZONE" ]
  then
  echo "EMPTY DOMAIN OR VALIDATION OR ZONE"
  exit -1
fi

echo $DYNZONE
echo $CERTBOT_DOMAIN
echo $CERTBOT_VALIDATION
echo $HOST

/usr/bin/nsupdate << EOM
zone ${DYNZONE}
update delete ${HOST}.${CERTBOT_DOMAIN} TXT
update add ${HOST}.${CERTBOT_DOMAIN} 10 TXT "${CERTBOT_VALIDATION}"
send
EOM
echo ""