简单防火墙程序，端口扫描，规则添加，立即更新，定量更新-Simple firewall program, port scanning, add the rule

nfr为linux系统防火墙的一部分，此工程将该模块完整移植出来，用于开发网络内容监控，内网安全方面的程序-nfr as part of linux system firewall， this project complete migration out of the module for the development of network content monitoring , network security program