#!/bin/sh /etc/rc.common
# vim: set noexpandtab tabstop=4 shiftwidth=4 softtabstop=4 :

# shellcheck disable=SC2034
START=90
# shellcheck disable=SC2034
STOP=10
# shellcheck disable=SC2034
USE_PROCD=1

# shellcheck disable=SC1091
. /lib/functions.sh

# Get the lan interface name
lan_device=
config_load network
config_get lan_device lan ifname

#config_load dscp

_add_dscp_domain() {
	domain=""; config_get domain "$1" name ""
	class=""; config_get class "$1" class ""
	[ -n "$domain" ] && [ -n "$class" ] && [ -z "$(uci -q get dhcp.omr_dscp_$class.domain | grep $domain)" ] && {
		uci -q batch <<-EOF
			add_list dhcp.omr_dscp_$class.domain="$domain"
			commit dhcp
		EOF
	}
}

_add_dscp_domains_rules() {
	for class in cs0 cs1 cs2 cs3 cs4 cs5 cs6 cs7 ef; do
		uci -q batch <<-EOF
			set dhcp.omr_dscp_${class}=ipset
			add_list dhcp.omr_dscp_${class}.name="omr_dscp_${class}_4"
			commit dhcp
		EOF
		if [ "$disableipv6" = "0" ]; then
			uci -q batch <<-EOF
				add_list dhcp.omr_dscp_${class}.name="omr_dscp_${class}_6"
				commit dhcp
			EOF
		fi
		uci batch <<-EOF
			set firewall.omr_dscp_${class}_4=ipset
			set firewall.omr_dscp_${class}_4.name="omr_dscp_${class}_4"
			set firewall.omr_dscp_${class}_4.match='dest_ip'
		EOF
		if [ "$disableipv6" = "0" ]; then
			uci -q batch <<-EOF
				set firewall.omr_dscp_${class}_6=ipset
				set firewall.omr_dscp_${class}_6.name="omr_dscp_${class}_6"
				set firewall.omr_dscp_${class}_6.match='dest_ip'
			EOF
		fi
		uci -q batch <<-EOF
			set firewall.omr_dscp_rule_${class}_4=rule
			set firewall.omr_dscp_rule_${class}_4.name="omr_dscp_${class}_4"
			set firewall.omr_dscp_rule_${class}_4.ipset="omr_dscp_${class}_4"
			set firewall.omr_dscp_rule_${class}_4.set_dscp="$(echo ${class} | tr '[a-z'] '[A-Z]')"
			set firewall.omr_dscp_rule_${class}_4.target='DSCP'
			set firewall.omr_dscp_rule_${class}_4.src='lan'
			set firewall.omr_dscp_rule_${class}_4.dest='*'
			commit firewall
		EOF
		if [ "$disableipv6" = "0" ]; then
			uci -q batch <<-EOF
				set firewall.omr_dscp_rule_${class}_6=rule
				set firewall.omr_dscp_rule_${class}_6.name="omr6_dscp_${class}_6"
				set firewall.omr_dscp_rule_${class}_6.ipset="omr_dscp_${class}_6"
				set firewall.omr_dscp_rule_${class}_6.target='DSCP'
				set firewall.omr_dscp_rule_${class}_6.set_dscp="$(echo ${class} | tr '[a-z'] '[A-Z]')"
				set firewall.omr_dscp_rule_${class}_6.src='lan'
				set firewall.omr_dscp_rule_${class}_6.dest='*'
				commit firewall
			EOF
		fi
	done
}

_add_dscp_rules() {
	proto=""     ; config_get proto "$1" proto all
	src_ip=""    ; config_get src_ip "$1" src_ip 0.0.0.0/0
	src_port=""  ; config_get src_port "$1" src_port 0:65535
	dest_ip=""   ; config_get dest_ip "$1" dest_ip 0.0.0.0/0
	dest_port="" ; config_get dest_port "$1" dest_port 0:65535
	class=""     ; config_get class "$1" class
	direction="" ; config_get direction "$1" direction "upload"
	comment=""   ; config_get comment "$1" comment "-"

	src_port="$(echo $src_port | sed 's/:/-/g')"
	dest_port="$(echo $dest_port | sed 's/:/-/g')"
	count=$((count + 1))
	[ "$proto" = "all" ] && proto="tcp udp"
	case "$direction" in
		upload|both)
			# Apply the rule locally
			uci -q batch <<-EOF
				set firewall.omr_dscp_rule$count=rule
				set firewall.omr_dscp_rule$count.name="omr_dscp_rule$count"
				set firewall.omr_dscp_rule$count.target="DSCP"
				set firewall.omr_dscp_rule$count.set_dscp="$(echo ${class} | tr '[a-z'] '[A-Z]')"
				set firewall.omr_dscp_rule$count.src="lan"
				set firewall.omr_dscp_rule$count.src_ip="$src_ip"
				set firewall.omr_dscp_rule$count.dest_ip="$dest_ip"
				set firewall.omr_dscp_rule$count.proto="$proto"
			EOF
			src_port="$(echo $src_port | sed 's/,/ /g')"
			dest_port="$(echo $dest_port | sed 's/,/ /g')"
			for port in $src_port; do
				uci -q set firewall.omr_dscp_rule$count.src_port="$src_port"
			done
			for port in $src_port; do
				uci -q set firewall.omr_dscp_rule$count.dest_port="$dest_port"
			done
			#_add_dscp_rule -m multiport --sports "$src_port" -m multiport --dports "$dest_port"
			;;
		download|both)
			;;
	esac
	uci -q commit firewall

}


_add_fwmark_chain() {
	_ipt4 -N dscp_mark
	_ipt4 -A PREROUTING -i "$lan_device" -j dscp_mark
	_ipt4 -A POSTROUTING -j dscp_mark
	if [ "$disableipv6" = "0" ]; then
		_ipt6 -N dscp_mark
		_ipt6 -A PREROUTING -i "$lan_device" -j dscp_mark
		_ipt6 -A POSTROUTING -j dscp_mark
	fi
	for class in cs4 cs5 cs6 cs7; do
		# xtun (hex) -> 0x7874756e
		_ipt4 -A dscp_mark \
			-m comment --comment "$class" \
			-m dscp --dscp-class "$class" \
			-j MARK --set-mark 0x7874756e
		if [ "$disableipv6" = "0" ]; then
			_ipt6 -A dscp_mark \
				-m comment --comment "$class" \
				-m dscp --dscp-class "$class" \
				-j MARK --set-mark 0x7874756e
		fi
	done
}

_remove_old_ipset_dnsmasq() {
	[ -n "$(uci -q get dhcp.${1}.name | grep omr)" ] && uci -q delete dhcp.$1
}
_remove_ipset_dnsmasq() {
	[ -n "$(echo $1 | grep omr_dscp)" ] && uci -q delete dhcp.$1
}

_remove_rules() {
	([ -n "$(echo $1 | grep omr_dscp)" ] || [ -n "$(echo $1 | grep omr6_dscp)" ]) && uci -q delete firewall.$1
}

_setup_tunnel() {
	# Mark the packets to route through xtun0
	_add_fwmark_chain
	# tun0: cs0 (default)
	# xtun0: cs6
	_ipt4 -A dscp_output -o "tun0" -j DSCP --set-dscp-class cs6
	if [ "$disableipv6" = "0" ]; then
		_ipt6 -A dscp_output -o "tun0" -j DSCP --set-dscp-class cs6
	fi
}

_cleanup() {
	uci -q del dhcp.@dnsmasq[0].ipset
	config_load dhcp
	config_foreach _remove_ipset_dnsmasq
	config_foreach _remove_old_ipset_dnsmasq
	config_load firewall
	config_foreach _remove_rules
	uci -q commit dhcp
	uci -q commit firewall
	fw4 -q restart
}

start_service() {
	# Cleanup
	_cleanup
	disableipv6="$(uci -q get openmptcprouter.settings.disable_ipv6)"
	config_load dscp
	# Add chains
	_add_dscp_domains_rules

	# Setup the tunnels dscp / marks
	#_setup_tunnel

	# Add rules base on the user configuration
	count=0
	config_foreach _add_dscp_rules classify
	config_foreach _add_dscp_domain domains
	uci -q commit dhcp
	fw4 -q restart
}

stop_service() {
	_cleanup
}

reload_service() {
	start
}

service_triggers() {
	procd_add_reload_trigger dscp
}