#!/bin/sh /etc/rc.common
# Copyright (C) 2018-2022 Ycarus (Yannick Chabanois) <ycarus@zugaina.org>
# shellcheck disable=SC2039
# vim: set noexpandtab tabstop=4 shiftwidth=4 softtabstop=4 :

# shellcheck disable=SC2034
{
	START=99
	STOP=10
	USE_PROCD=1
}

set_shadowsocks_address() {
	uci -q set shadowsocks-libev.$1.local_address="$2"
}

set_ipv6_state() {
	local disable_ipv6="$(uci -q get openmptcprouter.settings.disable_ipv6)"
	[ -z "$disable_ipv6" ] && disable_ipv6="1"
	#previous=$(sysctl -qn net.ipv6.conf.all.disable_ipv6 | tr -d "\n")
	previous="$(uci -q get network.lan.ipv6)"
	#sysctl -qw net.ipv6.conf.all.disable_ipv6=$disable_ipv6
	#sed -i "s:^net.ipv6.conf.all.disable_ipv6=[0-9]*:net.ipv6.conf.all.disable_ipv6=$disable_ipv6:" /etc/sysctl.d/zzz_openmptcprouter.conf
	sed -i "s:^net.ipv6.conf.all.disable_ipv6=[0-9]*::" /etc/sysctl.d/zzz_openmptcprouter.conf
	sysctl -qw net.ipv6.conf.all.disable_ipv6=0

	uci -q batch <<-EOF >/dev/null
		set firewall.@defaults[0].disable_ipv6=$disable_ipv6
		commit firewall
	EOF

	if [ "$disable_ipv6" = "1" ]; then
		logger -t "omr-6in4" "Disable IPv6"
		uci -q batch <<-EOF >/dev/null
			set unbound.@unbound[-1].protocol='ip4_only'
			commit unbound
			del_list v2ray.main.inbounds="omr6"
			commit v2ray
		EOF
		config_load shadowsocks-libev
		config_foreach set_shadowsocks_address ss_redir "0.0.0.0"
		uci -q batch <<-EOF >/dev/null
			commit shadowsocks-libev
		EOF
		[ ! -f /etc/wgetrc ] && cp /etc/wgetrc4 /etc/wgetrc
	else
		logger -t "omr-6in4" "Enable IPv6"
		uci -q batch <<-EOF >/dev/null
			set network.lan.delegate="0"
			set network.omr6in4.force_link=1
			set network.omr6in4.metric=1
			delete network.omr6in4.auto
			set unbound.@unbound[-1].protocol='mixed'
			commit unbound
		EOF
		if [ "$(uci -q get network.globals.ula_prefix)" = "" ]; then
			r1=$(dd if=/dev/urandom bs=1 count=1 |hexdump -e '1/1 "%02x"')
			r2=$(dd if=/dev/urandom bs=2 count=1 |hexdump -e '2/1 "%02x"')
			r3=$(dd if=/dev/urandom bs=2 count=1 |hexdump -e '2/1 "%02x"')
			uci -q set network.globals.ula_prefix=fd$r1:$r2:$r3::/48
		fi
		
		config_load shadowsocks-libev
		config_foreach set_shadowsocks_address ss_redir "::"
		uci -q batch <<-EOF >/dev/null
			commit network
			commit dhcp
			commit shadowsocks-libev
		EOF
		/etc/init.d/shadowsocks-libev restart
		if [ "$(uci -q get v2ray.main.inbounds | grep omr6)" = "" ]; then
			uci -q batch <<-EOF >/dev/null
				add_list v2ray.main.inbounds="omr6"
				commit v2ray
			EOF
			/etc/init.d/v2ray restart
		fi
		rm -f /etc/wgetrc
	fi
	/etc/init.d/odhcpd restart
	if [ "$previous" != "1" ]; then
		env -i /bin/ubus call network reload
	fi
}

set_ipv6_state_intf() {
	local disable_ipv6="$(uci -q get openmptcprouter.settings.disable_ipv6)"
	local intf="$1"
	config_get ip4table $intf ip4table
	config_get ipv6 $intf ipv6 "0"
	if [ "$ip4table" = "lan" ]; then
		if [ "$disable_ipv6" = "1" ] && [ "$ipv6" != "0" ]; then
			logger -t "omr-6in4" "Disable IPv6 on ${intf}"
			uci -q batch <<-EOF >/dev/null
				set dhcp.${intf}.ra_default="0"
				delete network.${intf}.ipv6
				delete dhcp.${intf}.dhcpv6
				delete dhcp.${intf}.ra
				delete dhcp.${intf}.ra_default
				delete dhcp.${intf}.ra_management
				delete dhcp.${intf}.ra_preference
				commit network
				commit dhcp
			EOF
		elif [ "$disable_ipv6" != "1" ] && [ "$ipv6" != "1" ]; then
			logger -t "omr-6in4" "Enable IPv6 on ${intf}"
			uci -q batch <<-EOF >/dev/null
				set dhcp.${intf}.dhcpv6="server"
				set dhcp.${intf}.ra="server"
				set dhcp.${intf}.ra_default="1"
				set dhcp.${intf}.ra_preference="high"
				set dhcp.${intf}.ra_management="1"
				delete dhcp.${intf}.ra_flags
				add_list dhcp.${intf}.ra_flags='managed-config'
				set dhcp.${intf}.ra_slaac='1'
				add_list dhcp.${intf}.ra_flags='other-config'
				set network.${intf}.ipv6="1"
				set network.${intf}.delegate="0"
			EOF
			if [ "$(uci -q get network.${intf}.ip6assign)" = "" ]; then
				uci -q set network.${intf}.ip6assign='60'
			fi
			uci -q batch <<-EOF >/dev/null
				commit network
				commit dhcp
			EOF
		fi
	fi
}

start_service() {
	[ "$(uci -q get openmptcprouter.settings.disable_ipv6)" != "1" ] && {
		config_load network
		config_foreach set_ipv6_state_intf interface
		set_ipv6_state
	}
	[ "$(uci -q get openmptcprouter.settings.disable_ipv6)" != "0" ] && {
		config_load network
		config_foreach set_ipv6_state_intf interface
		ifdown omr6in4
		[ -z "$(/etc/init.d/odhcpd status | grep inactive)" ] && /etc/init.d/odhcpd stop
		return
	}
	[ "$(ifstatus omr6in4 | jsonfilter -e '@.up' | tr -d '\n')" != "true" ] && ifup omr6in4
	multipath 6in4-omr6in4 off 2>&1 >/dev/null

	procd_open_instance
	# shellcheck disable=SC2086
	procd_set_param command /bin/omr-6in4
	procd_set_param limits nofile="51200 51200"
	procd_set_param respawn 0 10 0
	procd_set_param stderr 1
	procd_close_instance
}

service_triggers() {
	procd_add_reload_trigger "openmptcprouter"
}

reload_service() {
	stop
	start
}