using Cloudflare as DDNS in ASUSWRT-Merlin firmware

README.md

ASUSWRT-MERLIN custom DDNS Script for Cloudflare

for Cloudflare as DDNS

using Cloudflare API v4

Using

put ddns-start at /jffs/scripts/, setting values and set DDNS type to Custom at web Admin panel.

setting

EMAIL is your Cloudflare account

API is your Cloudflare API Key. You can find at My Setting -> API Key -> Global API Key -> View API Key

ZONEID can find by following command

curl -X GET "https://api.cloudflare.com/client/v4/zones" \\
    -H "X-Auth-Email: $EMAIL" \\
    -H "X-Auth-Key: $API" \\
    -H "Content-Type: application/json"

RECORDID can find by following command

curl -X GET "https://api.cloudflare.com/client/v4/zones/${ZONE}/dns_records?page=1&per_page=1000&order=type&direction=asc" \\
     -H "Content-Type:application/json" \\
     -H "X-Auth-Key: $API" \\
     -H "X-Auth-Email: $EMAIL"

RECORDNAME is target domain name like ddns.dd-han.tw

RECORDTTL is record TTL in minute (1=auto)

if you don't want skip SSL check, run opkg install ca-certificates and change command from curl -ks to curl -s

Reference

• asuswrt-merlin Wiki

ddns-start

#!/bin/sh

EMAIL="Your CloudFlare E-mail address"
API="Your Cloudflare API Key"
ZONEID="Your zone id, hex16 string"
RECORDID="You DNS record ID, hex16 string"
RECORDNAME="Your DNS record name, e.g. sub.example.com"
RECORDTTL="Your DNS record TTL (1=auto)"
IP=${1}

RES=`curl -ks -X PUT "https://api.cloudflare.com/client/v4/zones/${ZONEID}/dns_records/${RECORDID}" \
     -H "X-Auth-Email: ${EMAIL}" \
     -H "X-Auth-Key: ${API}" \
     -H "Content-Type: application/json" \
     --data "{\"type\":\"A\",\"name\":\"${RECORDNAME}\",\"content\":\"${IP}\",\"ttl\":${RECORDTTL},\"proxied\":false}"`

echo $RES | grep '"success":\ *true' > /dev/null

if [ $? -eq 0 ]; then
  /sbin/ddns_custom_updated 1
else
  /sbin/ddns_custom_updated 0
fi