[ 作者: wenhuah 添加时间: 2001-5-2 12:24:33 ]
来源：www.chinaaid.com.cn
目的利用一台internet dns host 将域名定向到家中(个人)的主机上.
目前cablemodem已经很快了,而且有动态ip,所以就有了将域名解析到个人机器的上可能.
只要通过很简单的设置就可以搞定.
例如你有一个域名叫 yourdomain.com ,你可以将此域名解析任意的主机.
1.服务器 (ip: a.a.a.a) 启动dns动态解析的一个小进程.
yourdomain.com的域名文件为 /var/named/yourdomain.com
再建个/var/named/yourdomain.com.static (模板文件可以用来生成yourdomain.com的)
(jdk1.3 , linux ,找个网管帮一下吧:)
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# 原代码如下: threaddnsreloadserver.java
import java.io.*;
import java.net.*;
public class threaddnsreloadserver
{ public static void main(string[] args)
{ int i=1;
try
{ serversocket s=new serversocket(8189);
for (;;)
{ socket incoming =s.accept();
system.out.println("accept new client: " + i);
new threaddnsreloadhandle(incoming,i).start();
i++ ;
}
}
catch (exception e)
{ system.out.println(e);
}
}
}
class threaddnsreloadhandle extends thread
{ public threaddnsreloadhandle(socket i,int c)
{ incoming= i; counter=c; }
public void run()
{ try
{ bufferedreader in=new bufferedreader(new inputstreamreader(incoming.getinputstream()));
string user="unkown";
string dnsfilepath="/var/named/";
string dnsfile="yourdomain.com";
string hostip="127.0.0.1";
boolean user_validated=true ;
boolean done=false;
while ( !done )
{ string str=in.readline();
//validate user;
if ( str ==null ) done=true;
else
{
str=str.trim();
if ( str.substring(0,2).equals("la") )
{ if (str.length() >2) user=str.substring(2);
}
if ( str.substring(0,2).equals("lb") )
{ if (str.length() >2) dnsfile=str.substring(2);
}
if ( str.substring(0,2).equals("lc") )
{ if (str.length() >2) hostip=str.substring(2);
}
if ( str.trim().equals("bye")) done = true;
}
}
incoming.close();
//加入用户验证.
//将服务器中的yourdomain.com.cn.static文件写入yourdomain.com.cn中
string dnstmp =dnsfilepath + dnsfile +".static";
bufferedreader sin=new bufferedreader(new filereader(dnstmp));
printwriter sout=new printwriter(new filewriter(dnsfilepath + dnsfile) , true);
string s;
while ((s=sin.readline()) != null)
{
if (s.startswith("host"))
{ s="host in a " + hostip;
sout.println(s);
s="@ in a " + hostip;
}
sout.println(s);
}
//system.out.println("user:" + user );
//system.out.println("dnsfile:" + dnsfile );
//system.out.println("hostip:" + hostip );
//ndc reload
string command="ndc reload " + dnsfile ;
java.lang.runtime.getruntime().exec(command);
}
catch ( exception e)
{ system.out.println(e);
}
}
private socket incoming;
private int counter;
}
2.客户机(windows / linux)
==============================================================
# 客户端每次启动时加入到开机启动(或进程中): socktest.java
import java.io.*;
import java.net.*;
public class sockettest
{ public static void main(string[] args)
{ try
{ socket s=new socket("a.a.a.a",8189);
bufferedreader in=new bufferedreader(new inputstreamreader(s.getinputstream()));
printwriter out=new printwriter(s.getoutputstream(),true);
