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<p><FONT class=normalfont><B><font color=blue>实现动态IP的域名解析</font></B></FONT><BR><FONT class=smallfont color=#ff9900>2004-04-23 15:18 pm</FONT><BR><FONT class=normalfont>作者：作者<br>来自：Linux知识宝库<br>联系方式：无名<br><br>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.<br>
<br>
1. 服务器 (IP: A.A.A.A) 启动DNS动态解析的一个小进程.<br>
yourdomain.com的域名文件为 /var/named/yourdomain.com<br>
再建个/var/named/yourdomain.com.static (模板文件可以用来生成yourdomain.com的)<br>
(JDK1.3 , linux ,找个网管帮一下吧:)<br>
=================================================<br>
# 原代码如下: ThreadDNSReloadServer.java<br>
import java.io.*;<br>
import java.net.*;<br>
<br>
public class ThreadDNSReloadServer<br>
{ public static void main(String[] args)<br>
{ int i=1;<br>
try<br>
{ ServerSocket s=new ServerSocket(8189);<br>
for (;;)<br>
{ Socket incoming =s.accept();<br>
System.out.println("accept new client: " + i);<br>
new ThreadDNSReloadHandle(incoming,i).start();<br>
i++ ;<br>
}<br>
}<br>
catch (Exception e)<br>
{ System.out.println(e);<br>
}<br>
}<br>
}<br>
<br>
class ThreadDNSReloadHandle extends Thread<br>
{ public ThreadDNSReloadHandle(Socket i,int c)<br>
{ incoming= i; counter=c; }<br>
<br>
public void run()<br>
{ try<br>
{ BufferedReader in=new BufferedReader(new InputStreamReader(incoming.getInputStream()));<br>
<br>
String User="Unkown";<br>
String DNSFILEPATH="/var/named/";<br>
String DNSFILE="yourdomain.com";<br>
String HOSTIP="127.0.0.1";<br>
boolean USER_VALIDATED=true ;<br>
boolean done=false;<br>
<br>
while ( !done )<br>
{ String str=in.readLine();<br>
//validate user;<br>
if ( str ==null ) done=true;<br>
else<br>
{<br>
str=str.trim();<br>
if ( str.substring(0,2).equals("LA") )<br>
{ if (str.length() >2) User=str.substring(2);<br>
}<br>
if ( str.substring(0,2).equals("LB") )<br>
{ if (str.length() >2) DNSFILE=str.substring(2);<br>
}<br>
if ( str.substring(0,2).equals("LC") )<br>
{ if (str.length() >2) HOSTIP=str.substring(2);<br>
}<br>
<br>
if ( str.trim().equals("BYE")) done = true;<br>
}<br>
<br>
}<br>
incoming.close();<br>
//加入用户验证.<br>
//将服务器中的yourdomain.com.cn.static文件写入yourdomain.com.cn中<br>
String DNSTMP =DNSFILEPATH + DNSFILE +".static";<br>
BufferedReader sin=new BufferedReader(new FileReader(DNSTMP));<br>
PrintWriter sout=new PrintWriter(new FileWriter(DNSFILEPATH + DNSFILE) , true);<br>
String s;<br>
while ((s=sin.readLine()) != null)<br>
{<br>
if (s.startsWith("host"))<br>
{ s="host IN A " + HOSTIP;<br>
sout.println(s);<br>
s="@ IN A " + HOSTIP;<br>
}<br>
sout.println(s);<br>
}<br>
//System.out.println("User:" + User );<br>
//System.out.println("DNSFILE:" + DNSFILE );<br>
//System.out.println("HOSTIP:" + HOSTIP );<br>
<br>
//ndc reload<br>
String command="ndc reload " + DNSFILE ;<br>
java.lang.Runtime.getRuntime().exec(command);<br>
<br>
}<br>
catch ( Exception e)<br>
{ System.out.println(e);<br>
}<br>
}<br>
<br>
private Socket incoming;<br>
private int counter;<br>
<br>
}<br>
<br>
2. 客户机(windows / linux)<br>
==============================================================<br>
# 客户端每次启动时加入到开机启动(或进程中): SockTest.java<br>
import java.io.*;<br>
import java.net.*;<br>
<br>
public class SocketTest<br>
{ public static void main(String[] args)<br>
{ try<br>
{ Socket s=new Socket("A.A.A.A",8189);<br>
BufferedReader in=new BufferedReader(new InputStreamReader(s.getInputStream()));<br>
PrintWriter out=new PrintWriter(s.getOutputStream(),true);<br>
<br>
<br>
InetAddress localHostAddress =InetAddress.getLocalHost() ; //get LocalHost Ip<br>
out.println("LAguest");<br>
out.println("LByourdomain.com");<br>
out.println("LC" + localHostAddress.getHostAddress() );<br>
<br>
out.close();<br>
s.close();<br>
<br>
}<br>
catch (IOException e)<br>
{ System.out.println(e);<br>
}<br>
}<br>
}<br>
<br>
=========================================================<br>
3. dns 样本文件: ( yourdomain.com.static)<br>
@ ns.dnsserver.com xxxxx<br>
xxxx<br>
......<br>
host IN A 127.0.0.1 // 此处就是要更改的地方<br>
www IN CNAME host<br>
...<br>
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