#!/bin/sh
checkip=$(dig +short A ip.openmptcprouter.com | tr -d "\n")
ipset add ss_rules_dst_bypass_all $checkip > /dev/null 2>&1
ip="$(curl -s -4 -m 3 --interface $1 http://ip.openmptcprouter.com)"
ipset del ss_rules_dst_bypass_all $checkip > /dev/null 2>&1
if expr "$ip" : '[0-9][0-9]*\.[0-9][0-9]*\.[0-9][0-9]*\.[0-9][0-9]*$' >/dev/null; then
	echo $ip
fi