# local-etc-hosts-updater

Queries the mDNS record for a given .local address, and maps it to the given subdomains inside a hosts file

Linux >5.1 only due to SO_BINDTOIFINDEX socket option.

## Usage

### CLI Args

`local-etc-hosts-updater <local_domain> <ip_version> <scope_id>`

- `local_domain` is the local domain to be queried
- `ip_version` is an enum.
  - 4 will query for an IPv4 address in the `192.168.0.0/16` subnet
  - 6 will query for a ULA IPv6 address in the `fd00::/8` subnet
  - 0 will do both
- `scope_id` is either the name of the interface, or the corresponding numeric interface index. The index is largely for unrooted android limitations.

### ENV vars

- `OLD_HOSTS_PATH` path to the current hosts file
- `TARGET_DOMAIN` public domain for the subdomains
- `SUBDOMAIN_LIST` space separated list of subdomains to map