python C/S模式基础编程 (网络安全系列）

http://blog.youkuaiyun.com/jeanphorn/article/details/45371017

1. socket编程

socket类型包括：

——TCP socket 和 UDP socket。

• 常规的客户服务区模式。

——Raw socket

• 可用于嗅探和注入

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2. C/S模式

　　C/S （Client/Server，客户机/服务器）模式又称C/S结构，是20世纪80年代末逐步成长起来的一种模式，是软件系统体系结构的一种。C/S结构的关键在于功能的分布，一些功能放在前端机（即客户机）上执行，另一些功能放在后端机（即服务器）上执行。 
　　

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3.python c/s 编程

　　server部分代码： 
　　

<code class="hljs perl has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-top-left-radius: 0px; border-top-right-radius: 0px; border-bottom-right-radius: 0px; border-bottom-left-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">#!/usr/bin/env python</span>
<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># _*_ coding:utf-8 _*_</span>

import <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">socket</span>

tcpSock = <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">socket</span>.<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">socket</span>(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">socket</span>.AF_INET,<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">socket</span>.SOCK_STREAM)
tcpSock.<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">bind</span>((<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"0.0.0.0"</span>,<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">8080</span>))
tcpSock.<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">listen</span>(<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">5</span>)

<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">print</span> <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'等待客户端连接... ...'</span>

(client,(ip,sock)) = tcpSock.<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">accept</span>()

<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">print</span> <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'建立起一个连接，对方IP为：'</span>, ip

<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">print</span> <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'开始接收数据... ...'</span>

data = <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'start'</span>

<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">while</span> len(data):
    data = client.<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">recv</span>(<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">2048</span>)
    <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">print</span> <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'接收到的数据： '</span>, data
    client.<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">send</span>(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'return data:'</span>+data)

<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">print</span> <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'关闭连接... ... '</span>
client.<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">close</span>()

<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">print</span> <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'关闭服务... ...'</span>
tcpSock.<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">close</span>()
</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li><li style="box-sizing: border-box; padding: 0px 5px;">24</li><li style="box-sizing: border-box; padding: 0px 5px;">25</li><li style="box-sizing: border-box; padding: 0px 5px;">26</li><li style="box-sizing: border-box; padding: 0px 5px;">27</li><li style="box-sizing: border-box; padding: 0px 5px;">28</li><li style="box-sizing: border-box; padding: 0px 5px;">29</li><li style="box-sizing: border-box; padding: 0px 5px;">30</li></ul>

运行server端python程序，并用一下命令进行测试：

<code class="hljs nginx has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-top-left-radius: 0px; border-top-right-radius: 0px; border-bottom-right-radius: 0px; border-bottom-left-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 0, 136);">nc</span> <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">192.168.1.95</span> <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">8080</span></code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li></ul>

server响应：

client测试：

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4. 针对client的选项

• 按顺序依次处理
• 多线程服务端
• 多进程服务端
• 非阻塞模式的socket（使用select）