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SYN端口扫描

于 2023-08-14 发布 文件大小:11.17 kB
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代码说明:

设计实现 TCP 的 SYN 扫描,打印出被扫描主机上开启的 TCP 端口号 void scanbysyn(IN_ADDR *src_ip,IN_ADDR *dst_ip,int startport,int endport) 参数: src_ip:指向扫描主机 IP 地址的指针 dst_ip:指向目标主机 IP 地址的指针 startport:扫描起始端口号 endport:扫描终止端口号 原理: 扫描器向目标主机的一个端口发送请求连接的 SYN 包,扫描器在收到 SYN/ACK 后, 不是发送的 ACK 应答而是发送 RST 包请求断开连接。这样,三次握手就没有完成,无法建 立正常的 TCP 连接,因此,这次扫描就不会被记录到系统日志中。这种扫描技术一般不会在 目标主机上留下扫描痕迹。但是,这种扫描需要有 root 权限。

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