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如何實現動態IP的域名解析

 例如你有一個域名叫 yourdomain.com ,你可以將此域名解析任意的主機.  1.服務器 (IP: A.A.A.A) 啟動DNS動態解析的一個小進程.   yourdomain.com的域名文件為 /var/named/yourdomain.com  再建個/var/named/yourdomain.com.static (模板文件可以用來生成yourdomain.com的)  (JDK1.3 , Linux ,找個網管幫一下吧:)  =================================================  # 原代碼如下: 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();   //加入用戶驗證.   //將服務器中的yourdomain.com.cn.static文件寫入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.客戶機(windows / linux)  ==============================================================  # 客戶端每次啟動時加入到開機啟動(或進程中): 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);   }   }   }  =========================================================  3.dns 樣本文件: ( yourdomain.com.static)  @ ns.dnsserver.com xxxxx   xxxx   ......  host IN A 127.0.0.1 // 此處就是要更改的地方  www IN CNAME host  ...      




 



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