commit shareinet script

utils/shareinet.sh

+get_iface_net()
+{
+	ip addr show $1 | grep inet | grep "inet " | awk '{ print $2}'
+}
+
+get_iface_ip()
+{
+	local IPNET=$(get_iface_net $1)
+	echo ${IPNET/\/*/}
+}
+
+set_snat()
+{
+	for i in wimax0 wlan0 eth0 ; do
+		IP=$(get_iface_ip $i)
+		[ -n "$IP" ] || continue
+		echo $i $IP
+		echo "Set SNAT to $i $IP"
+		iptables -t nat -A POSTROUTING -o $i -j SNAT --to $IP
+		return
+	done
+}
+
+set_snat_by_default()
+{
+	IP=$(ip route | grep "default via" | awk '{ print $3 }')
+	DEV=$(ip route | grep "default via" | awk '{ print $5 }')
+	echo "Found default route via $DEV $IP"
+	IP=$(get_iface_ip $DEV)
+	echo "Set SNAT from $IP"
+	iptables -t nat -A POSTROUTING -s 192.168.0.0/16 -o $DEV -j SNAT --to $IP
+}
+
+iptables -F -t nat
+dhcpcd wimax0
+sleep 5
+set_snat_by_default