#!/system/bin/sh
IP=$(ip a sh dev rmnet0 | grep rmnet0$ | busybox awk '{print $2}' | busybox cut -d'/' -f1)
VALID_IP="$(echo $IP | busybox awk -F'.' '$1 <=255 && $2 <= 255 && $3 <= 255 && $4 <= 255')"
if [ -z "$VALID_IP" ] ; then
echo "The IP address isn't valid"
else
echo "The IP address is valid: $IP"
ip r add default via $IP table rmnet0 && echo -n "Route added. Testing routing... "
if [ "$(ping -c 1 4.2.2.1 | grep icmp* | busybox wc -l)" -eq "1" ] ; then
echo "OK."
exit 0
else
echo "KO."
exit 1
fi
fi