[ohmic314]

I was unable to get DDNS working with Porkbun using the dd-wrt web GUI, so I thought I would just write a little how-to in case someone else needs help setting it up.

- Use this website from Porkbun to get the API key and Secret key for your account: https://kb.porkbun.com/article/190-getting-started-with-the-porkbun-api
- Ssh into the router and run the following command - replace the $DOMAIN, $SECRET_KEY, and $APIKEY with your domain, secret key, and apikey that was obtained from the previous step


Code:

curl -sb -X POST https://api.porkbun.com/api/json/v3/dns/retrieve/$DOMAIN -H "Content-Type: application/json" -d "{\"secretapikey\":\"$SECRET_KEY\",\"apikey\":\"$APIKEY\"}"


- Record the ID for the domain/subdomain that you're looking to update with dd-wrt

For example, the code will return something like:
{"status":"SUCCESS","cloudflare":"enabled","records":[{"id":"31415926","name":"subdomain.domain.com","type":"A","content":"5.5.5.5","ttl":"600","prio":"0","notes":null}...
The id that you need is: 31415926

- Go to dd-wrt menu item Administration -> Commands box and copy/paste the following code. Be sure to replace YOUR_DOMAIN, YOUR_SECRET_KEY, YOUR_APIKEY, and ID with the ones for your domain


Code:

#!/bin/sh # Get the current WAN ip address CURRENT_IP=`nvram get wan_ipaddr` # These options are to retrieve IP address in case of double NAT #CURRENT_IP=$(curl -fs4 https://myip.dnsomatic.com/) #CURRENT_IP=$(curl -fs4 http://checkip.amazonaws.com/) #CURRENT_IP=$(curl --silent http://api.ipify.org/) # Compare with the last saved address if grep -q "$CURRENT_IP" /tmp/last_wan_ip; then   echo DDNS: No change needed else   echo DDNS: Change needed   # Write the current IP to the file to compare to later   echo $CURRENT_IP > /tmp/last_wan_ip   APIKEY="YOUR_APIKEY"   SECRET_KEY="YOUR_SECRET_KEY"   DOMAIN="YOUR_DOMAIN"   SUBDOMAIN="YOUR_SUBDOMAIN"   ID="YOUR_ID"   RESPONSE=$(curl -sb \       -X POST https://api.porkbun.com/api/json/v3/dns/edit/$DOMAIN/$ID \       -H "Content-Type: application/json" \       -d "{\"secretapikey\":\"$SECRET_KEY\",\"apikey\":\"$APIKEY\",\"name\":\"$SUBDOMAIN\",\"type\":\"A\",\"content\":\"$CURRENT_IP\"}") fi


- Click Save Custom
- Go to Administration -> Management -> Cron -> Additional Jobs and add instructions to run the .rc_custom script every minute and force update every day at 2am


Code:

* * * * * root /tmp/.rc_custom 30 2 * * * root rm /tmp/last_wan_ip


- Save and Apply/reboot

I hope this helps someone out there!