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DNS中继服务器程序

读入“域名-IP地址”对照表，当客户端查询域名对应的IP地址时，用域名检索该对照表，三种检索结果：

  1. 检索结果为IP地址0.0.0.0，则向客户端返回“域名不存在”的报错消息（不良网站拦截功能）
  2. 检索结果为普通IP地址，则向客户返回这个地址（服务器功能）
  3. 表中未检到该域名，则向因特网DNS服务器发出查询，并将结果返给客户端（中继功能）

测试方法： nslookup [查询的域名] 127.0.0.1

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