# cache-domains

Service to dynamically configure the local DNS (dnsmasq) to redirect game content servers to a LAN cache. Definitive list dynamically obtained from https://github.com/uklans/cache-domains.

## Configuration
Configuration file follows the same [syntax as the upsteam file](https://github.com/uklans/cache-domains/blob/master/scripts/config.example.json). The key for each `cache_domain` member matches the name of one of the `.txt` files in the [upstream root directory](https://github.com/uklans/cache-domains/blob/master/), except for the `default` key which matches the all the unreferenced `.txt` files. The value of each `cache_domain` member maps to one of the keys of the `ips` members, Thus mapping a cached domain to a list of IP addresses/LAN cache server.

```json
{
	"ips": {
		"server1":	["10.10.3.10", "10.10.3.11"],
		"server2":	"10.10.3.12",
		"server3":	"10.10.3.13"
	},
	"cache_domains": {
		"default":	"server2",
		"blizzard":	"server1",
		"origin":	"server1",
		"steam":	"server1",
		"wsus":		"server3",
		"xboxlive":	"server3"
	}
}
```

## Startup/Shutdown
On start the local DNS (dnsmasq) will be configured to redirect the configured cache domains and on stop the redirection will be removed.

## Testing
With the above configuration set and the service running `nslookup swcdn.apple.com` would return `10.10.3.12`
