implement port-forwarding demon in python

How to Use:

1. create table
python db.py create
2. insert data for port forwarding
for example:
python db.py insert 0.0.0.0 22 2222 
your 2222 port to your 22
python db.py insert 74.125.31.104 80 80
your 80 port to google
3. start deamon
python port_forwarding.py