前置知识：winsock

难度： 低

编译环境：VC6.0＋win2000

测试环境：win2000＋局域网



那我就先来说说一个最简单的端口扫描器的原理吧。最常用的端口扫描器是根据能否连接目标主机的端口来判断目标端口开放与否的。扫描方式是利用TCP的完全连接方式。当目标主机某端口开放服务，那么该服务程序就会在该端口进行监听-Pre-knowledge: winsock Difficulty: Low build environment: VC6.0+ win2000 test environment: win2000+ LAN that I would give it that one of the most simple principles of right port scanner. The most commonly used to connect the port scanner is based on whether the target host port to determine the destination port open or not. Scanning mode is to use the full TCP connection. When the target host an open service ports, then the service program will carry out monitoring at the port