#!/bin/sh

. /etc/network/functions

set -eu

address=
subnet=
gateway=

dhcpd_opts_start_cb()
{
	exec 3>"/var/run/udhcpd.${IFACE}.conf"
	printf 'interface %s\n' "${IFACE}" >&3
	printf 'pidfile /var/run/udhcpd.%s.pid\n' "${IFACE}" >&3
	printf 'lease_file /var/lib/misc/udhcpd.%s.leases\n' "${IFACE}" >&3
}

dhcpd_opt_cb()
{
	local key="${1}"
	shift 1
	local val="${*}"

	case "${key}" in
		dhcpd-*)
			key="$(printf '%s\n' "${key#dhcpd-}" | tr '-' '_')"
			printf '%s %s\n' "${key}" "${val}" >&3
			;;
		address)
			address="${val}"
			;;
		subnet)
			subnet="${val}"
			;;
		gateway)
			gateway="${val}"
			;;
	esac
}

dhcpd_opts_end_cb()
{
	printf 'option subnet %s\n' "${subnet}" >&3
	if [ "x${gateway}" != 'x' ]; then
		printf 'option router %s\n' "${gateway}" >&3
	else
		printf 'option router %s\n' "${address}" >&3
	fi
	sed 's/nameserver/option dns/' /etc/resolv.conf >&3
	exec &3>-

	udhcpd -S "/var/run/udhcpd.${IFACE}.conf"
}

get_iface_opts dhcpd_opts_start_cb dhcpd_opt_cb dhcpd_opts_end_cb