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 ...
