stun.sh

#!/bin/bash
tmpfile=$(tempfile)
stun -v stun.l.google.com:19302 2> $tmpfile > /dev/null
port1=$(grep Opened.port $tmpfile | head -1 | cut -d ' ' -f 3)
port2=$(grep Opened.port $tmpfile | tail -1 | cut -d ' ' -f 3)
hostport1=$(grep MappedAddre $tmpfile | head -1 | cut -d ' ' -f 3)
hostport2=$(grep MappedAddre $tmpfile | tail -1 | cut -d ' ' -f 3)
rm -f $tmpfile
globalipv4=$(echo $hostport1 | cut -d : -f 1)
globalport1=$(echo $hostport1 | cut -d : -f 2)
globalport2=$(echo $hostport2 | cut -d : -f 2)
echo $port1
echo $port2
echo $globalipv4
echo $globalport1
echo $globalport2

targetipv4=54.218.114.62
set -x
nc -u -p $port1 $targetipv4 $port1