update_ipv6.sh

#!/bin/sh
#
# Updates a zone record using Gandi's LiveDNS.

# prevent shell to expand wildcard record
set -f

API="https://api.gandi.net/v5/livedns/"
IP_SERVICE="http://me.gandi.net"

if [[ -z "${GANDI_PAT}" && ! -z ${APIKEY} ]]; then
  GANDI_PAT=${APIKEY}
fi

if [[ -z "${FORCE_IPV6}" ]]; then
  WAN_IPV6=$(curl -s6 ${IP_SERVICE})
  if [[ -z "${WAN_IPV6}" ]]; then
    echo "$(date "+[%Y-%m-%d %H:%M:%S]") [ERROR] Something went wrong. Can not get your IPv6 from ${IP_SERVICE}"
    exit 1
  fi
else
  WAN_IPV6="${FORCE_IPV6}"
fi

for RECORD in ${RECORD_LIST//;/ } ; do
  if [ "${RECORD}" = "@" ] || [ "${RECORD}" = "*" ]; then
    SUBDOMAIN="${DOMAIN}"
  else
    SUBDOMAIN="${RECORD}.${DOMAIN}"
  fi

  CURRENT_IPV6=$(dig AAAA ${SUBDOMAIN} +short)
  if [ "${CURRENT_IPV6}" = "${WAN_IPV6}" ] ; then
    echo "$(date "+[%Y-%m-%d %H:%M:%S]") [INFO] Current DNS AAAA record for ${RECORD} matches WAN IP (${CURRENT_IPV6}). Nothing to do."
    continue
  fi

  DATA='{"rrset_ttl": '${TTL}', "rrset_values": ["'${WAN_IPV6}'"]}'
  status=$(curl -s -w %{http_code} -o /dev/null -XPUT -d "${DATA}" \
    -H"Authorization: Bearer ${GANDI_PAT}" \
    -H"Content-Type: application/json" \
    "${API}/domains/${DOMAIN}/records/${RECORD}/AAAA")
  if [ "${status}" = '201' ] ; then
    echo "$(date "+[%Y-%m-%d %H:%M:%S]") [OK] Updated ${RECORD} to ${WAN_IPV6}"
  else
    echo "$(date "+[%Y-%m-%d %H:%M:%S]") [ERROR] API POST returned status ${status}"
  fi
done