openmptcprouter-feeds/luci-app-openmptcprouter/root/bin/omr-ip-intf

#!/bin/sh
check_ipv4_website="$(uci -q get openmptcprouter.settings.check_ipv4_website)"
[ -z "$check_ipv4_website" ] && check_ipv4_website="http://ip.openmptcprouter.com"
checkip=$(echo $check_ipv4_website | sed -e 's/https:\/\///' -e 's/http:\/\///' | xargs dig +short A | tr -d "\n")
ipset add ss_rules_dst_bypass_all $checkip > /dev/null 2>&1
ip="$(curl -s -4 -m 3 --interface $1 $check_ipv4_website)"
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