dyndns

Update Gandi LiveDNS based on the current (dynamic) ip.

Why

Some (most ?) providers (Orange for example) don't provide you with a fix IP address: they give you a dynamic IP that changes over time. This makes it hard to self-host software and share them publicly via a domain because you have to constantly change the IP your domain is pointing to.

This program aims to solve that. It's intended to run on a always-on computer in your home (such as Raspberry Pi).

Highlights

• Supports both IPv4 and IPv6.
• Ship as single binary with no OS dependencies.
• Reports failures and successful updates on a Discord channel. /!\ This is not optional (by design).

Install

• From GitHub releases: download the binary corresponding to your OS and architecture.
• From source (make sure $GOPATH/bin is in your $PATH):

go install go.mlcdf.fr/dyndns

Setup

dyndns requires the following environment variables to be set:

name	description
DISCORD_WEBHOOK_URL	your Discord channel webhook
GANDI_TOKEN	your Gandi API Key

Usage

Usage:
    dyndns --domain [DOMAIN] --record [RECORD]

Options:
    --ttl                Time to live in seconds. Defaults to 3600
    --always-notify      Always notify the Discord channel (even when nothing changes)
    -V, --version        Print version

Examples:
    export DISCORD_WEBHOOK_URL='https://discord.com/api/webhooks/xxx'
    export GANDI_TOKEN='foobar'
    dyndns --domain example.com --record "*.pi"

Setup as a cron job

crontab -e
# Run every 10 minutes
*/10 * * * * /path/to/dyndns --domain example.com --record "*.pi"

Check out the example contrib/deploy.sh script.

Development

Requirements:

• go version > 1.19+
• docker

Run the app

go run main.go

Run the tests

go test ./...

Force go test to run all the tests (by disabling caching)

./scrits/test.sh

License

MIT