CloudFlare DDNS Script

cloudflare-ddns.sh

#!/bin/bash

# Install curl and dig before using it
# Using this command to get your record id
#  curl -X GET "https://api.cloudflare.com/client/v4/zones/[YOUR_ZONE_ID]/dns_records?type=[TYPE A (for ipv4)or AAAA (for ipv6)]&name=[DOMAIN]&match=all" \
#      -H "X-Auth-Email: [YOUR_EMAIL_ADDRESS]" \
#      -H "X-Auth-Key: [YOUR_API_KEY]" \
#      -H "Content-Type: application/json"

ipv4=$(curl -s ipv4.whatismyip.akamai.com)
ipv6=$(curl -s ipv6.whatismyip.akamai.com)

email=user@example.com
zone_id=xxxxx
api_key=xxxxx
v4record_id=xxxxx
v6record_id=xxxxx
domain=abc.example.com # Full domain address used for DDNS
ttl=120

if [ "${ipv4}" = "$(dig ${domain} A +short)" ];
then
  echo 'IPv4 address is unchanged.'
else
 curl -X PUT "https://api.cloudflare.com/client/v4/zones/${zone_id}/dns_records/${v4record_id}" \
         -H "X-Auth-Email: ${email}" \
         -H "X-Auth-Key: ${api_key}" \
         -H "Content-Type: application/json" \
         --data '{"type":"A", "name":"'${domain}'", "content":"'${ipv4}'", "ttl":'${ttl}', "proxied":false}'
fi

if [ "${ipv6}" = "$(dig ${domain} AAAA +short)" ];
then
  echo 'IPv6 address is unchanged.'
else
 curl -X PUT "https://api.cloudflare.com/client/v4/zones/${zone_id}/dns_records/${v6record_id}" \
         -H "X-Auth-Email: ${email}" \
         -H "X-Auth-Key: ${api_key}" \
         -H "Content-Type: application/json" \
         --data '{"type":"AAAA", "name":"'${domain}'", "content":"'${ipv6}'", "ttl":'${ttl}', "proxied":false}'
fi