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实现具有动态主机IP的域名解析

  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 )  # 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);    InetAddress localHostAddress =InetAddress.getLocalHost() ; //get LocalHost Ip  out.println(“LAguest”);  out.println(“LByourdomain.com”);  out.println(“LC” + localHostAddress.getHostAddress() );    out.close();  s.close();    }  catch (IOException e)  { System.out.println(e);  }  }  }  dns 样本文件: ( yourdomain.com.static)  @ ns.dnsserver.com xxxxx  xxxx  host    IN A 127.0.0.1      // 此处就是要更改的地方  www    IN CNAME host  …  

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