#!/bin/sh
. /lib/functions.sh

intf=$1
timeout="$(uci -q get openmptcprouter.settings.status_vps_timeout)"
[ -z "$timeout" ] && timeout="1"

[ -z "$intf" ] && return

get_mptcp_from_server() {
	serverport=$(uci -q get openmptcprouter.$1.port)
	get_mptcp() {
		serverip=$1
		if [ "$(echo $serverip | grep :)" ]; then
			if [ -f /proc/sys/net/mptcp/enabled ]; then
				support="$(mptcpize run curl -s -k -6 -m ${timeout} --interface $intf https://[$serverip]:$serverport/mptcpsupport)"
			else
				support="$(curl -s -k -6 -m ${timeout} --interface $intf https://[$serverip]:$serverport/mptcpsupport)"
			fi
		else
			if [ -f /proc/sys/net/mptcp/enabled ]; then
				support="$(mptcpize run curl -s -k -4 -m ${timeout} --interface $intf https://$serverip:$serverport/mptcpsupport)"
			else
				support="$(curl -s -k -4 -m ${timeout} --interface $intf https://$serverip:$serverport/mptcpsupport)"
			fi
		fi
		[ -n "$support" ] && {
			support=$(echo $support | jsonfilter -e '@.mptcp')
			break
		}
	}
	config_list_foreach $1 ip get_mptcp
	[ -n "$support" ] && break
}

get_mptcp_from_website() {
	multipathip=$(dig +short A multipath-tcp.org | tr -d "\n")
	ipset add ss_rules_dst_bypass_all $multipathip > /dev/null 2>&1
	support="$(curl -s -4 -m ${timeout} --interface $intf http://www.multipath-tcp.org)"
	ipset del ss_rules_dst_bypass_all $multipathip > /dev/null 2>&1
	[ -n "$support" ] && {
		if [ "$support" = "Yay, you are MPTCP-capable! You can now rest in peace." ]; then
			support="working"
		else
			support="not working"
		fi
	}
}

get_mptcp_from_website6() {
	multipathip=$(dig +short AAAA multipath-tcp.org | tr -d "\n")
	ipset add ss_rules6_dst_bypass_all $multipathip > /dev/null 2>&1
	support="$(curl -s -6 -m ${timeout} --interface $intf http://www.multipath-tcp.org)"
	ipset del ss_rules6_dst_bypass_all $multipathip > /dev/null 2>&1
	[ -n "$support" ] && {
		if [ "$support" = "Yay, you are MPTCP-capable! You can now rest in peace." ]; then
			support="working"
		else
			support="not working"
		fi
	}
}

support=""
config_load openmptcprouter
config_foreach get_mptcp_from_server server
if [ ! -f /proc/sys/net/mptcp/enabled ] && [ -z "$support" ]; then
	[ -n "$(ip -4 a show dev $intf)" ] && get_mptcp_from_website
	[ -n "$(ip -6 a show dev $intf)" ] && get_mptcp_from_website6
fi
if [ "$support" = "working" ]; then
	echo "MPTCP enabled"
elif [ "$support" = "not working" ]; then
	echo "MPTCP disabled"
fi