#!/bin/sh /etc/rc.common
# Copyright (C) 2006-2015 OpenWrt.org

START=15
USE_PROCD=1
PROG=/usr/sbin/chronyd
HOTPLUG=/usr/sbin/chrony-hotplug
CONFIGFILE=/etc/chrony/chrony.conf
INCLUDEFILE=/var/etc/chrony.d/10-uci.conf
RTCDEVICE=/dev/rtc0

handle_source() {
	local cfg=$1 sourcetype=$2 disabled hostname minpoll maxpoll iburst nts
	local prefer xleave maxdelay mindelay maxsamples minsamples port ntsport maxsources

	config_get_bool disabled "$cfg" disabled 0
	[ "$disabled" = "1" ] && return
	hostname=$NTP_SOURCE_HOSTNAME
	[ -z "$hostname" ] && config_get hostname "$cfg" hostname
	[ -z "$hostname" ] && return
	config_get minpoll "$cfg" minpoll
	config_get maxpoll "$cfg" maxpoll
	config_get_bool iburst "$cfg" iburst 0
	config_get_bool nts "$cfg" nts 0
	config_get_bool prefer "$cfg" prefer 0
	config_get_bool xleave "$cfg" xleave 0
	config_get maxdelay "$cfg" maxdelay
	config_get mindelay "$cfg" mindelay
	config_get maxsamples "$cfg" maxsamples
	config_get minsamples "$cfg" minsamples
	config_get port "$cfg" port
	config_get ntsport "$cfg" ntsport
	config_get maxsources "$cfg" maxsources
	echo $(
		echo $sourcetype $hostname
		[ -n "$minpoll" ] && echo minpoll $minpoll
		[ -n "$maxpoll" ] && echo maxpoll $maxpoll
		[ "$iburst" = "1" ] && echo iburst
		[ "$nts" = "1" ] && echo nts
		[ "$prefer" = "1" ] && echo prefer
		[ "$xleave" = "1" ] && echo xleave
		[ -n "$maxdelay" ] && echo maxdelay $maxdelay
		[ -n "$mindelay" ] && echo mindelay $mindelay
		[ -n "$maxsamples" ] && echo maxsamples "$maxsamples"
		[ -n "$minsamples" ] && echo minsamples "$minsamples"
		[ -n "$port" ] && [ "$nts" = "0" ] && echo port $port
		[ -n "$ntsport" ] && [ "$nts" = "1" ] && echo ntsport $ntsport
		[ -n "$maxsources" ] && [ "$cfg" = "pool" ] && echo maxsources $maxsources
	)
}

handle_allow() {
	local cfg=$1 iface wan_iface wan6_iface subnet subnets subnets6

	network_find_wan wan_iface true
	network_find_wan6 wan6_iface true
	config_get ifaces "$cfg" interface

	for iface in $ifaces; do
		if [ "$wan_iface" = "$iface" ]; then
			echo allow 0/0
		elif [ "$wan6_iface" = "$iface" ]; then
			echo allow ::/0
		else
			network_get_subnets subnets $iface
			network_get_subnets6 subnets6 $iface
			for subnet in $subnets $subnets6; do
				echo allow $subnet
			done
		fi
	done
}

handle_makestep() {
	local cfg=$1 threshold limit

	config_get threshold "$cfg" threshold
	config_get limit "$cfg" limit
	[ -z "$threshold" -o -z "$limit" ] && return
	echo makestep $threshold $limit
}

handle_nts() {
	local cfg=$1 rtccheck systemcerts trustedcerts

	config_get_bool rtccheck "$cfg" rtccheck 0
	config_get_bool systemcerts "$cfg" systemcerts 1
	config_get trustedcerts "$cfg" trustedcerts
	# Disable certificate time checks if no RTC is present
	[ "$rtccheck" = "1" ] && ! [ -c $RTCDEVICE ] && echo nocerttimecheck 1
	[ "$systemcerts" = "0" ] && echo nosystemcert
	[ -n "$trustedcerts" ] && echo ntstrustedcerts "$trustedcerts"
}

handle_smoothtime() {
	local cfg=$1 maxppm maxwander leaponly suffix
	config_get maxppm "$cfg" maxppm
	config_get maxwander "$cfg" maxwander
	config_get_bool leaponly "$cfg" leaponly 0
	[ "$leaponly" = "1" ] && suffix=leaponly
	[ -n "$maxppm" ] && [ -n "$maxwander" ] && echo smoothtime "$maxppm" "$maxwander" "$suffix"
}

handle_systemclock() {
	# system clock specific settings
	local cfg=$1 precision leapsecmode
	config_get precision "$cfg" precision
	config_get leapsecmode "$cfg" leapsecmode
	[ -n "$precision" ] && echo clockprecision "$precision"
	[ -n "$leapsecmode" ] && echo clockleapsecmode "$leapsecmode"
}

handle_logging() {
	local cfg=$1 logchange

	config_get logchange "$cfg" logchange
	[ -n "$logchange" ] && echo logchange "$logchange"
}

start_service() {
	. /lib/functions/network.sh

	procd_open_instance
	procd_set_param command $PROG -n
	procd_set_param file $CONFIGFILE
	procd_set_param file $INCLUDEFILE
	procd_close_instance

	procd_open_instance
	procd_set_param command $HOTPLUG
	procd_close_instance

	config_load chrony
	mkdir -p $(dirname $INCLUDEFILE)

	(
		config_foreach handle_source server server
		config_foreach handle_source pool pool
		config_foreach handle_source peer peer
		config_foreach handle_allow allow
		config_foreach handle_makestep makestep
		config_foreach handle_smoothtime smoothtime
		config_foreach handle_systemclock systemclock
		config_foreach handle_nts nts
		config_foreach handle_logging logging
	) > $INCLUDEFILE
}