dyndnsdo
A basic application that I can run on a virtual machine to perform dynamic DNS updates from my UniFi Security Gateway.
How it works?
Using the namecheap backend in the USG, I can pass values and a custom endpoint
address where the ddclient utility will periodically submit.
The /update endpoint is appended to the server parameter and is requested by
HTTPS. It is passed four form values, encoded as the query string to a GET
request:
- host
- domain
- password
- ip
I want to update the naked domain name record, so we pass the domain name as the
domain value, @ as the host, our target IP as identified by the USG is ip
and password is a pre-shared secret.
Certificates
The application will require the -cert and -key switches to allow the service
to make use of TLS.
Socket activation
I wanted to experiment with a few technologies. Using Go was first, but socket activation means that the application will be spawned when traffic is received.
# /etc/systemd/system/dyndns.socket
[Socket]
ListenStream=443
[Install]
WantedBy=sockets.target
# /etc/systemd/system/dyndns.service
[Service]
Environment=DO_API_TOKEN=TOP_SECREY
ExecStart=/usr/local/bin/dyndnsdo -cert /etc/pki/tls/private/cert1.pem -key /etc/pki/tls/private/privkey1.pem -password sharedsecret