password ftp pcket sniffer

介绍怎样在linux下使用netfilter编写内核网络模块，例子独特新颖，包括轻量防火墙和FTP 密码嗅探器等，非常实用。-Describes how to use netfilter in linux kernel network module writing, examples of unique new, including the lightweight firewall and FTP password sniffer with other, very practical.