unblock-us toggle

unblock-us.bash

# Unblock-US toggler
function unblock-us() {
	local status="${1}"
	local default="Wi-Fi"
	local service="${2:-${default}}"

	if [[ "${status}" == "on" ]]; then
		local dns=(208.122.23.23 208.122.23.22)
	elif [[ "${status}" == "off" ]]; then
		local dns="empty"
	else
		local IFS=$'\n'
		local svclist=($(networksetup -listallnetworkservices))
		cat<<-USAGE
		usage: unblock-us on|off [<service>]

		commands:

		  on         Enables the Unblock-US DNS.
		  off        Disables the Unblock-US DNS.

		arguments:

		  <service>  The service used for the Unblock-US DNS;
		             defaults to '${default}' if not specified.

		services:

		$(printf '  %s\n' "${svclist[@]}")
		USAGE

		printf "${status:+\n"error: invalid option '${status}'"\n}"

		return 1
	fi

  sudo networksetup -setdnsservers ${service} ${dns[@]}
}