Build a Linux IPv6 DNS Server

Building a Linux IPv6 DNS Server

/*Loading .sh (Shell Script) */
putChar()
{
i=1
while [ $i -le $3 ]
do
echo -n quot;$1quot;
sleep $2
i=`expr $i + 1`
done
}

clear
echo
putChar _ 0 80
echo -e quot;nquot;
echo quot; !!! Loading System Detailsquot;
echo -ne quot;nttit may take few seconds quot;
sleep 1
putChar '.' 0.25 20
putChar '.' 0 20
putChar _ 0 80
sleep 1

echo -ne quot;nnnt--> Checking system details quot;
putChar '.' 0.5 8
echo -e quot;nntt-- Machine (hardware) type : `uname -m`quot;

Page 54

sleep 2
echo -e quot;tt-- Machine's network hostname : ùname -n`quot;
sleep 1
echo -e quot;tt-- Operating system release : ùname -r`quot;
sleep 0.5
echo -e quot;tt-- Operating system name : ùname -s`quot;
sleep 0.5
echo -e quot;tt-- Host processor type : ùname -p`quot;
sleep 0.25
echo -e quot;tt-- Operating system version : ùname -v`quot;

sleep 1
echo -ne quot;nnt--> Checking for root user privilege quot;
putChar '.' 0.5 6
sleep 1
if [ quot;`whoami`quot; != quot;rootquot; ]
then
echo -e quot;nntt-- Sorry this software has to be run by root user....nnquot;
sleep 2
echo -e quot;nttAborting.......quot;;
sleep 5
exit
else
sh run.sh
echo -e quot;nntt-- found root user privileges !quot;
sleep 1
echo -ne quot;nntttttttt quot;
putChar '->' 0.25 5

Page 55

sleep 1
echo -e quot;nquot;
fi

/* Builder.c [C source File] */

#include <unistd.h>
#include <stdio.h>
#include <dirent.h>
#include <string.h>
#include <sys/stat.h>
#include <stdlib.h>
void printChar(char c, int count) {
int i;
for(i=0; i<count; i++)
printf(quot;%cquot;, c);
printf(quot;nquot;);
} // end printChar

void bu()
{
system(quot;sh built.shquot;);
}
void Builder() {
char ans, dirName[260];
char dir,command[260];
FILE *fp = fopen(quot;SourceDirquot;, quot;rquot;);
fscanf(fp, quot;%squot;, dirName);

Page 56

fclose(fp);
printf(quot;Enter the Dir. Name Default is '%s' is it o.k (y/n): quot;, dirName);
scanf(quot; %cquot;, &dir);
if(dir == 'y') {
printf(quot;Ensure that U have copied the source files..quot;);
printf(quot;Shall I Proceed...(y/n): quot;);
scanf(quot; %cquot;, &ans);
if(ans == 'y') {
chdir(dirName);
// system(quot;cp -rf /usr/src/linux-2.4.21-4.EL/arch/i386/defconfig /usr/src/linux-
2.4.21-4.EL/arch/i386/defconfig.orgquot;);
printChar('/',79);
printChar('/',79);
printf(quot;Press Any key to proceed with cleaning...quot;);
getchar();
getchar();
printChar('/',79);
printChar('/',79);
system(quot;sleep 40quot;);
printf(quot;Press Any key to proceed with kernel image creation...quot;);
getchar();
/* system(quot;make bzImage &> /dev/zeroquot;);*/
bu();
printChar('*', 79);
printChar('*', 79);

Page 57

printChar('*', 79);
//strcpy(command,quot;cp /Project/ntfssupportedkernel arch/i386/boot/bzImagequot;);
//system(command);
printf(quot;nProcess Completed Successfully!!!nnquot;);
}
} else {
printf(quot;Enter the directory Name: quot;);
scanf(quot;%squot;, dirName);
printf(quot;Ensure that U have copied the source files..quot;);
printf(quot;Shall I Proceed...(y/n): quot;);
scanf(quot; %cquot;, &ans);
printf(quot;ans is %cnquot;, ans);
if(ans == 'y') {
chdir(dirName);
system(quot;make dep &> /dev/zeroquot;);
// system(quot;make dep | tee .o; ./.squot;);
printChar('/',79);
printChar('/',79);
printf(quot;Press Any key to proceed with cleaning...quot;);
getchar();
getchar();
printChar('/',79);
printChar('/',79);
printf(quot;Press Any key to proceed with kernel image creation...quot;);
getchar();

Page 58

printChar('/',79);
printChar('/',79);
//system(quot;sleep 60quot;);
printChar('*', 79);
system(command);
printChar('*', 79);
printf(quot;Process Completed Successfully!!!nnquot;);
}
}
} // end Builder
int main() {
Builder();
} // end main

/* Dir Handler.c [C source File] */
#include <unistd.h>
#include <stdio.h>
#include <dirent.h>
#include <string.h>
#include <sys/stat.h>
#include <stdlib.h>
void PrintDir(char *dirName, int depth) {
DIR *dp;
struct dirent *entry;
struct stat statbuf;
if((dp = opendir(dirName)) == NULL) {
fprintf(stderr, quot;Cann't open Directory: %snquot;, dirName);
return;

Page 59

}
chdir(dirName);
while((entry = readdir(dp)) != NULL) {
lstat(entry->d_name, &statbuf);
if(S_ISDIR(statbuf.st_mode)) {
/* ignore . and .. */
if(strcmp(quot;.quot;, entry->d_name) == 0 || strcmp(quot;..quot;, entry->d_name)==0)
continue;
printf(quot;%s/nquot;, entry->d_name);
} // end if
} // end while
} // end PrintDir
void DirHandler() {
FILE *fp = fopen(quot;SourceDirquot;, quot;wquot;);
char dirName[81];
char command[200];
char cmd[250];
char srcName[260], destName[260];
char pro;
char defDir[] = quot;/usr/src/quot;;
char srcRel[50], destRel[50];
printf(quot;Enter the Dir To be scanned: quot;);
scanf(quot;%squot;, dirName);
PrintDir(dirName, 0);
printf(quot;nn... That's all folks...nquot;);
printf(quot;The default dir is '%s' Shall I proceed? (y/n): quot;, defDir);
scanf(quot; %cquot;, &pro);
if(pro == 'n') {

Page 60

printf(quot;Enter the Directory U want to be backed up: quot;);
scanf(quot;%squot;, srcName);
printf(quot;Now Enter the Directory name U want the sources to be in: quot;);
scanf(quot;%squot;, destName);
command[0]='0';
strcat(command, quot;cp -r quot;);
strcat(command, srcName);
strcat(command, quot; quot;);
strcat(command, destName);
cmd[0] = '0';
strcat(cmd, command);
printf(quot;n Command %squot;,cmd);
printf(quot;nPress any key to go ahead with backup....quot;);
printf(quot;This process may take several minutes... pls. wait....quot;);
/* getchar();
getchar();
printf(quot;n Command %s quot;, command);*/
getchar();
system(command);
} else {
printf(quot;Enter the Directory U want to be backed up: quot;);
scanf(quot;%squot;, srcRel);
srcName[0]='0';
strcpy(srcName, defDir);
strcat(srcName, srcRel);
printf(quot;Now Enter the Directory name U want the sources to be in: quot;);
scanf(quot;%squot;, destRel);

Page 61

strcpy(destName, defDir);
strcat(destName, destRel);
command[0]='0';

strcat(command, quot;cp -r quot;);
strcat(command, srcName);
strcat(command, quot; quot;);
strcat(command, destName);
printf(quot;nPress any key to go ahead with backup....quot;);
printf(quot;This process may take several minutes... pls. wait....quot;);
getchar();
getchar();
system(command);
}
fprintf(fp, quot;%squot;, destName);
fclose(fp);
} // end DirHandler

int main() {
DirHandler();
}

/* MemberAdderGUI (Server Side) */

import java.net.*;
import java.awt.*;
import java.util.*;
import javax.swing.*;

Page 62

import java.awt.event.*;

public class MemberAdderGUI extends JFrame
{
ServerSocket serverSocket;
int DEFAULT_PORT=111;
int port;
Vector membersList;
JFrame frame;
TextField tfStatus;
Container c;
JPanel pnlPortInfo;
JTextField jtfPort;
JButton btnAction;
java.awt.List lstMembers;
String strBtnCaption = quot;quot;;
Thread memberAdder;

public MemberAdderGUI(String title)
{
super(title);
membersList = new Vector();
frame = this;
c = getContentPane();
strBtnCaption = quot;Startquot;;
pnlPortInfo = new JPanel();
pnlPortInfo.setLayout(new BorderLayout());
pnlPortInfo.add(quot;Westquot;, new JLabel(quot;Port: quot;));

Page 63

pnlPortInfo.add(quot;Centerquot;, jtfPort = new JTextField(7));
pnlPortInfo.add(quot;Eastquot;, btnAction = new JButton(strBtnCaption));
btnAction.addActionListener(new Axn());
c.add(quot;Northquot;, pnlPortInfo);
c.add(quot;Centerquot;, lstMembers = new java.awt.List(7));
c.add(quot;Southquot;, tfStatus = new TextField());
setDefaultCloseOperation(DISPOSE_ON_CLOSE);
setSize(300, 300);
setLocation(70, 70);
setVisible(true);
}

public MemberAdderGUI(int port)
{
this.port = port;
membersList = new Vector();
}
class MemberAdder implements Runnable
{
public void run()
{
try
{
serverSocket = new ServerSocket(port);
System.out.println(quot;Member Adder started and waiting...at 'quot; + port + quot;'..!!quot;);
Socket clientSocket = null;

while(true)

Page 64

{
clientSocket = serverSocket.accept();
System.out.println(quot;Connected to machine: quot; + clientSocket);
String ipAddress = clientSocket.getInetAddress().getHostAddress();
clientSocket.close();
addMember(ipAddress);
printMembers();
}
}
catch(Exception e)
{
}
} // end run
} // end MemberAdder
public void addMember(String ipAddress)
{
if(!membersList.contains(ipAddress))
{
membersList.add(ipAddress);
lstMembers.add(ipAddress);
tfStatus.setText(quot;Added 'quot; + ipAddress + quot;' Successfully!!quot;);
}
else
{
System.out.println(quot;quot;quot; + ipAddress + quot;quot; has been added already!!!quot;);
tfStatus.setText(quot;quot;quot; + ipAddress + quot;quot; has been added already!!!quot;);
}
}

Page 65

public void printMembers()
{
System.out.println(quot;nnList of Available members is..nquot;);
Enumeration list = membersList.elements();
while(list.hasMoreElements())
{
System.out.println((String)list.nextElement());
}
System.out.println(quot;-----------------------that's all-----------------------quot;);
}

class Axn implements ActionListener
{
public void actionPerformed(ActionEvent ae)
{
String strCommand = ae.getActionCommand();
try
{
if(strCommand.equals(quot;Startquot;))
{
strBtnCaption = quot;Stopquot;;
btnAction.setText(strBtnCaption);
if(jtfPort.getText().equals(quot;quot;))
{
port = DEFAULT_PORT;
}

else

Page 66

{
port = Integer.parseInt(jtfPort.getText());
}
if(memberAdder == null)
{
memberAdder = new Thread(new MemberAdder());
memberAdder.start();
}
else
{
memberAdder = null;
System.gc();
}
}

else if(strCommand.equals(quot;Stopquot;))
{
strBtnCaption = quot;Startquot;;
btnAction.setText(strBtnCaption);
serverSocket.close();
serverSocket = null;
System.gc();
}
}
catch(Exception e)
{
System.out.println(quot;MemberAdderGUI: Axn: quot; + e);
} // end try-catch

Page 67

} // end action
} // end Axn

public static void main(String [] args)
{
new MemberAdderGUI(quot;Member Listquot;);
}
} // end MemberAdderGUI

/* AddMeAsMemberGUI (Client Side)*/

import java.io.*;
import java.net.*;
import java.awt.*;

public class AddMeAsMemberGUI extends JFrame
{
String host;
int port;
JTextField jtfHost, jtfPort;
JPanel pnlHostInfo, pnl1, pnl2, pnlActions;
JFrame frame;
Container c;
JButton btnRegister, btnClose;
public AddMeAsMemberGUI(String title)
{

Page 68

setTitle(title);
frame = this;
pnlHostInfo = new JPanel();
pnlHostInfo.setLayout(new BorderLayout());
pnl1 = new JPanel();
pnl1.setLayout(new GridLayout(2, 1));
pnl1.add(jtfHost = new JTextField(15));
pnl1.add(jtfPort = new JTextField(15));
pnl2.add(new JLabel(quot;Host: quot;));
pnl2.add(new JLabel(quot;Port: quot;));
pnlActions = new JPanel();
pnlActions.setLayout(new GridLayout(1, 2));
pnlActions.add(btnRegister = new JButton(quot;Registerquot;));
btnRegister.addActionListener(new Axn());
pnlActions.add(btnClose = new JButton(quot;Closequot;));
btnClose.addActionListener(new Axn());
pnlHostInfo.add(quot;Centerquot;, pnl1);
pnlHostInfo.add(quot;Westquot;, pnl2);
pnlHostInfo.add(quot;Southquot;, pnlActions);
c.add(quot;Centerquot;, pnlHostInfo);
setSize(200, 110);
setVisible(true);
} // end cons

Page 69


class AddMe implements Runnable
{
public void run() {
try
{
Socket clientSocket = new Socket(host, port);
}
catch(Exception e)
{
System.out.println(quot;AddMe: Axn: quot; + e);
}
} // end run
} // end AddMe

public class Axn implements ActionListener
{
{
String strCmd = ae.getActionCommand();
if(strCmd.equals(quot;Registerquot;))
{
host = jtfHost.getText();
new Thread(new AddMe()).start();
}
else if(strCmd.equals(quot;Closequot;))
{

Page 70

frame.dispose();
}
}
} // end Axn

{
new AddMeAsMemberGUI(quot;Add Me As MEMBERquot;);
}
} // end AddMeAsMemberGUI

/* LookUp Server GUI (Server Side) */

import java.io.*;
import java.net.*;
import java.awt.*;

public class LookUpServerGUI extends JFrame
{
ServerSocket serverSok;
JButton btnStart, btnStop;
JTextField jtfPort;
JPanel pnlActions, pnlPortInfo;
boolean stopServer;
Thread lookupSvr;
Container c;

Page 71


public LookUpServerGUI(String title)
{
super(title);
pnlPortInfo = new JPanel();
pnlPortInfo.setLayout(new GridLayout(1, 2));
pnlPortInfo.add(new JLabel(quot;Port: quot;));
pnlPortInfo.add(jtfPort = new JTextField(4));
pnlActions.add(btnStart = new JButton(quot;Startquot;));
pnlActions.add(btnStop = new JButton(quot;Stopquot;));
btnStart.addActionListener(new Axn());
btnStop.addActionListener(new Axn());
c.add(quot;Northquot;, pnlPortInfo);
c.add(quot;Centerquot;, pnlActions);
setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
setSize(100, 100);
setVisible(true);
} // end cons

class LookupServer implements Runnable
{
public void run()
{
try

Page 72

{
int port;
stopServer = false;
String strPort = jtfPort.getText();
if(!strPort.equals(quot;quot;))
{
port = Integer.parseInt(strPort);
}
else
{
port = 1234;
}

If (serverSok == null)
{
serverSok = new ServerSocket(port);
}
else
{
; // do NOTHING
}
while(stopServer == false)
{
System.out.println(quot;Waiting....at 'quot; + port + quot;'quot;);
Socket clientSok = serverSok.accept();
System.out.println(quot;Connected to: quot; + clientSok);
PrintWriter toClient = new PrintWriter(clientSok.getOutputStream(), true);
toClient.println(quot;Activequot;);

Page 73

toClient.flush();
clientSok.close();
} // end while
}
catch(Exception e)
{
System.out.println(quot;LookupServer: quot; + e);
}
} // end run
}

{
{
try
{
if(strCmd.equals(quot;Startquot;))
{
if(lookupSvr == null)
{
lookupSvr = new Thread(new LookupServer());
lookupSvr.start();
}
else
{
System.out.println(quot;Already Running!!!!quot;);

Page 74

}
}

else if(strCmd.equals(quot;Stopquot;))
{
stopServer = true;
serverSok.close();
serverSok = null;
lookupSvr = null;
System.gc();
System.out.println(quot;Stopped!!quot;);
} // end if
}
catch(Exception e)
{
System.out.println(e);
} // end try-catch
} // end action
} // end Axn

{
new LookUpServerGUI(quot;Lookup Serverquot;);
}
} // end LookUpServerGUI

/* LookUpClientGUI */

Page 75

import java.io.*;
import java.net.*;
import java.awt.*;

public class LookUpClientGUI extends JFrame
{
String host;
int port;
JTextField jtfHost, jtfPort;
JPanel pnlHostInfo, pnl1, pnlActions;
JFrame frame;
Container c;
TextField tfStatus;
JButton btnLookup, btnClose;

public LookUpClientGUI(String title)
{
setTitle(title);
frame = this;
pnlHostInfo = new JPanel();
pnlHostInfo.setLayout(new BorderLayout());
pnl1.add(new JLabel(quot;Host: quot;));
pnl1.add(jtfHost = new JTextField(15));

Page 76

pnl1.add(new JLabel(quot;Port: quot;));
pnl1.add(jtfPort = new JTextField(15));

pnlActions.add(btnLookup = new JButton(quot;Lookupquot;));
btnLookup.addActionListener(new Axn());
pnlHostInfo.add(quot;Centerquot;, pnl1);
pnlHostInfo.add(quot;Southquot;, pnlActions);
c.add(quot;Centerquot;, pnlHostInfo);
c.add(quot;Southquot;, tfStatus = new TextField());
setSize(200, 135);
setVisible(true);
} // end cons

{
{
if(strCmd.equals(quot;Lookupquot;))
{
host = jtfHost.getText();

Page 77

new Thread(new LookupClient()).start();
}
else if(strCmd.equals(quot;Closequot;))
{
frame.dispose();
}
}
} // end Axn
public void run()
{
try
{
Socket clientSok = new Socket(host, port);
BufferedReader fromServer = new BufferedReader(new
InputStreamReader(clientSok.getInputStream()));
String answer = fromServer.readLine();
if(answer.equals(quot;Activequot;))
{
System.out.println(quot;The Server is active...quot;);
tfStatus.setText(quot;The Server is ACTIVE...quot;);
}
}
catch(Exception e)
{
System.out.println(quot;Exception has come the server seems to be NOT
ACTIVE..quot;);
tfStatus.setText(quot;server seems to be NOT ACTIVE..quot;);
} // end try-catch

Page 78

} // end run
} // end LookupClient

{
new LookUpClientGUI(quot;Lookup Clientquot;);
}
} // end LookUpClientGUI

/* DNSmain (Server Side) */

import java.awt.*;

public class DNSmain extends JFrame
{
JMenuBar mbar;
JMenu mnuDNS, mnuHelp;
JMenuItem jmi;
JFrame frame;
Container c;
JDesktopPane jdp;

public DNSmain(String title)
{
super(title);
frame = this;

Page 79

jdp = new JDesktopPane();
c.add(jdp);
mbar = new JMenuBar();
mnuDNS = new JMenu(quot;DNSquot;);
jmi = new JMenuItem(quot;Control Panelquot;, 'C');
jmi.setAccelerator(KeyStroke.getKeyStroke('C',
java.awt.event.InputEvent.ALT_MASK));
jmi.addActionListener(new Axn());
mnuDNS.add(jmi);
mnuDNS.addSeparator();
jmi = new JMenuItem(quot;IPv6 Addressquot;, 'I');
jmi.setAccelerator(KeyStroke.getKeyStroke('I',
mnuDNS.add(jmi);
jmi = new JMenuItem(quot;IPv4 Addressquot;, 'A');
jmi.setAccelerator(KeyStroke.getKeyStroke('A',
mnuDNS.add(jmi);
mnuDNS.addSeparator();
jmi = new JMenuItem(quot;Exitquot;, 'X');
jmi.setAccelerator(KeyStroke.getKeyStroke('X',
mnuDNS.add(jmi);
mnuHelp = new JMenu(quot;Helpquot;);

Page 80

jmi = new JMenuItem(quot;Contentsquot;, 'C');
jmi.setAccelerator(KeyStroke.getKeyStroke('C',
mnuHelp.add(jmi);
jmi = new JMenuItem(quot;Search...quot;, 'S');
jmi.setAccelerator(KeyStroke.getKeyStroke('S',
mnuHelp.add(jmi);
mnuHelp.addSeparator();
jmi = new JMenuItem(quot;Aboutquot;, 'A');
jmi.setAccelerator(KeyStroke.getKeyStroke('A',
mnuHelp.add(jmi);
mbar.add(mnuDNS);
mbar.add(mnuHelp);
setJMenuBar(mbar);
setDefaultCloseOperation(0);
addWindowListener(new WinLstner());
setSize(600, 500);
setVisible(true);
} // end cons

{

Page 81

{
String cmdString = ae.getActionCommand();
if(cmdString.equals(quot;Exitquot;))
{
int result = JOptionPane.showConfirmDialog(frame, quot;Do you Really want
to quit?quot;,
quot;Quitting?quot;, JOptionPane.YES_NO_CANCEL_OPTION,
JOptionPane.QUESTION_MESSAGE);
if(result == JOptionPane.YES_OPTION)
frame.dispose();
}
else if(cmdString.equals(quot;Control Panelquot;))
{
JInternalFrame jif = new DNSpanelIF(quot;DNS panelquot;);
jdp.add(jif);
}
else if(cmdString.equals(quot;IPv6 Addressquot;))
{
JInternalFrame jif = new Ipv6RecordAdderIF(quot;IPv6 DNS Recordsquot;);
jdp.add(jif);
}
else if(cmdString.equals(quot;IPv4 Addressquot;))
{
JInternalFrame jif = new Ipv4RecordAdderIF(quot;IPv4 DNS Recordsquot;);
jdp.add(jif);
}
} // end action

Page 82

} // end Axn

class WinLstner extends WindowAdapter
{
public void windowClosing(WindowEvent we)
{
int result = JOptionPane.showConfirmDialog(frame, quot;Do you Really want
to quit?quot;,
quot;Quitting?quot;, JOptionPane.YES_NO_CANCEL_OPTION,
JOptionPane.QUESTION_MESSAGE);
if(result == JOptionPane.YES_OPTION)
frame.dispose();
}
} // end WinLstner

{
new DNSmain(quot;IPv6 ready DNSquot;);
} // end main
} // end DNSmain

/* DNShandler */

import java.io.*;
public class DNShandler
{
public void startDNS()
{

Page 83

try
{
Runtime r = Runtime.getRuntime();
Process p = r.exec(quot;service named startquot;);
BufferedReader br = new BufferedReader(new
InputStreamReader(p.getInputStream()));
String line = quot;quot;;
while((line = br.readLine()) != null)
System.out.println(line);
}
catch(Exception e)
{
System.out.println(quot;startDNS:: quot; + e);
}
}

public void stopDNS()
{
try
{
Process p = r.exec(quot;service named stopquot;);
}

Page 84

catch(Exception e)
{
System.out.println(quot;stopDNS:: quot; + e);
}
}

public void reloadDNS()
{
try
{
Process p = r.exec(quot;service named reloadquot;);
}
catch(Exception e)
{
System.out.println(quot;reloadDNS:: quot; + e);
}
}

{
new DNShandler().reloadDNS();

Page 85

} // end main
} // end DNShandler

/* DNS Panel (Server side) */

import java.awt.*;

public class DNSpanel extends JFrame
{
JPanel pnlActions;
JButton btnStart, btnStop, btnRestart, btnClose;
JFrame frame;
Container c;
public DNSpanel(String title)
{
super(title);
frame = this;
pnlActions.add(btnRestart = new JButton(quot;Restartquot;));

Page 86

btnRestart.addActionListener(new Axn());
c.add(pnlActions);
setSize(200, 100);
setVisible(true);
} // end DNspanel

{
{
{
new DNShandler().startDNS();
}
{
new DNShandler().stopDNS();
}
else if(strCommand.equals(quot;Restartquot;))
{
}
else if(strCommand.equals(quot;Closequot;))
{
frame.dispose();

Page 87

}
} // end action
} // end Axn

{
new DNSpanel(quot;DNS panelquot;);
} // end main
} // end DNSpanel

/* DNS panel IF (Internal Frame) */

import java.awt.*;

public class DNSpanelIF extends JInternalFrame
{
JPanel pnlActions;
JButton btnStart, btnStop, btnRestart, btnClose;
JInternalFrame frame;
Container c;
public DNSpanelIF(String title)
{
super(title);
frame = this;

Page 88

pnlActions.add(btnRestart = new JButton(quot;Restartquot;));
btnRestart.addActionListener(new Axn());
c.add(pnlActions);
setClosable(true);
setResizable(true);
setMaximizable(true);
setIconifiable(true);
setSize(200, 100);
setVisible(true);
} // end DNspanel

{
{
{
new DNShandler().startDNS();
}

Page 89

{
new DNShandler().stopDNS();
}
else if(strCommand.equals(quot;Restartquot;))
{
}
else if(strCommand.equals(quot;Closequot;))
{
frame.dispose();
}
} // end action
} // end Axn

{
new DNSpanelIF(quot;DNS panelquot;);
} // end main
} // end DNSpanelIF

/* Ipv4RecordAdder */

import java.io.*;
import java.net.*;
import java.awt.*;

Page 90


public class Ipv4RecordAdder extends JFrame
{
String zoneFileName;
String dnsDirectory = quot;/var/named/quot;; // DEFAULT DIRECTORY
JTextField jtfDomainName, jtfHostName, jtfAddress;
JButton btnAdd, btnClose;
JPanel pnlActions, pnlCenter;
JFrame frame;
Container c;
public Ipv4RecordAdder(String title)
{
super(title);
frame = this;
pnlCenter = new JPanel();
pnlCenter.setLayout(new GridLayout(3, 2));
pnlCenter.add(new JLabel(quot;Domain Name : quot;));
pnlCenter.add(jtfDomainName = new JTextField());
pnlCenter.add(new JLabel(quot;Host Name : quot;));
pnlCenter.add(jtfHostName = new JTextField());
pnlCenter.add(new JLabel(quot;IPv4 Address: quot;));
pnlCenter.add(jtfAddress = new JTextField());
pnlActions.add(btnAdd = new JButton(quot;Addquot;));
btnAdd.addActionListener(new Axn());

Page 91

c.add(quot;Centerquot;, pnlCenter);
c.add(quot;Southquot;, pnlActions);
setSize(280, 150);
setVisible(true);
} // end cons

{
{
try
{
if(cmdString.equals(quot;Addquot;))
{
String domainName = jtfDomainName.getText();
String zoneFileName = dnsDirectory + domainName + quot;.zonequot;;
String hostName = jtfHostName.getText();
String ipAddress = jtfAddress.getText();
PrintWriter zoneFile = new PrintWriter(new
FileOutputStream(zoneFileName, true));
zoneFile.println(hostName + quot;tINtAtquot; + ipAddress);
System.out.println(quot;Record Added Successfully!!!!quot;);

// Clear the TextFields

Page 92

jtfDomainName.setText(quot;quot;);
jtfHostName.setText(quot;quot;);
jtfAddress.setText(quot;quot;);
zoneFile.close();
}
else if(cmdString.equals(quot;Closequot;))
{
frame.dispose();
}
}
catch(Exception e)
{
System.out.println(quot;Ipv4 Add: quot; + e);
} // end try-catch
} // end action
} // end Axn

{
new Ipv4RecordAdder(quot;IPv4 Record Adder..quot;);
} // end main
} // end Ipv4RecordAdder

/* Ipv4RecordAdderIF (Internal Frame) */

import java.io.*;
import java.net.*;
import java.awt.*;

Page 93


public class Ipv4RecordAdderIF extends JInternalFrame
{
Container c;

public Ipv4RecordAdderIF(String title)
{
super(title);
frame = this;

Page 94

setClosable(true);
setResizable(true);
setSize(280, 150);
setVisible(true);
} // end cons

{
{
try
{
{

Page 95

zoneFile.println(hostName + quot;tINtAtquot; + ipAddress);

zoneFile.close();
}
{
frame.dispose();
}
}
catch(Exception e)
{
} // end try-catch
} // end action
} // end Axn
{
new Ipv4RecordAdderIF(quot;IPv4 Record Adder..quot;);
} // end main
} // end Ipv4RecordAdderIF

Page 96


/* Ipv6RecordAdder */

import java.io.*;
import java.net.*;
import java.awt.*;

public class Ipv6RecordAdder extends JFrame
{
J Button btnAdd, btnClose;
JFrame frame;
Container c;

public Ipv6RecordAdder(String title)
{
super(title);
frame = this;

Page 97

setSize(280, 150);
setVisible(true);
} // end cons

{
{
try
{
{

Page 98

zoneFile.println(hostName + quot;ttINtAAAAtquot; + ipAddress);

zoneFile.close();
}
{
frame.dispose();
}
}
catch(Exception e)
{
} // end try-catch
} // end action
} // end Axn

{

Page 99

new Ipv6RecordAdder(quot;IPv6 Record Adder..quot;);
} // end main
} // end Ipv6RecordAdder

/* Ipv6RecordAdderIF (Internal Frame) */
import java.io.*;
import java.net.*;
import java.awt.*;

public class Ipv6RecordAdderIF extends JInternalFrame
{
Container c;

public Ipv6RecordAdderIF(String title)
{
super(title);
frame = this;

Page 100


setClosable(true);
setResizable(true);
setSize(280, 150);
setVisible(true);
} // end cons

{

Page 101

{
try
{
{
zoneFile.println(hostName + quot;ttINtAAAAtquot; + ipAddress);

zoneFile.close();

}
{
frame.dispose();
}
}
catch(Exception e)

Page 102

{
} // end try-catch
} // end action
} // end Axn

{
new Ipv6RecordAdderIF(quot;IPv6 Record Adder..quot;);
} // end main
} // end Ipv6RecordAdderIF

/* Address Handler (Server Side) */

import java.io.*;
import java.net.*;
public class AddressHandler
{
public AddressHandler()
{
try
{
//
System.out.println(Inet6Address().numericToTextForm
at()); ServerSocket sok = new
ServerSocket(2995);
System.out.println(quot;Server Ready!!!quot;);
Socket client = sok.accept();

Page 103

System.out.println(client);
InputStreamReader(client.getInputStream()));
String line = br.readLine();
System.out.println(quot;Client has sent...quot; + line);
}
catch(Exception e)
{
} // end try-catch
} // end cons
{
new AddressHandler();
}
}

/* Client (Client Side) */

import java.io.*;
import java.net.*;
public class Client
{
public Client(String host, int port)
{
try
{
System.out.println(Inet6Address().numericToTextFormat());

Page 104

Socket sok = new Socket(host, port);
System.out.print(quot;Enter some text: quot;);
String line = new BufferedReader(new
InputStreamReader(System.in)).readLine();
PrintWriter out = new PrintWriter(sok.getOutputStream());
out.println(line);
out.flush();
}
catch(Exception e)
{
} // end try-catch
} // end cons
{
new Client(args[0], Integer.parseInt(args[1]));
}
}

Page 105


/* A Typical view of Named.conf Configuration file */

## named.conf - configuration for bind
#
# Generated automatically by redhat-config-bind, alchemist et al.
# Any changes not supported by redhat-config-bind should be put
# in /etc/named.custom
#
controls {
inet 127.0.0.1 allow { localhost; } keys { rndckey; };
};
include quot;/etc/named.customquot;;
include quot;/etc/rndc.keyquot;;
#options {
# listen-on-v6 { any; };
#};
zone quot;localhostquot; {
type master;
file quot;localhost.zonequot;;
};
zone quot;mahendra.comquot; {
type master;
file quot;mahendra.com.zonequot;;
};

Page 106


/* A Typical view of mahendra.com.zone Configuration file */

$TTL 86400
@ IN SOA localhost. root.localhost (
5 ; serial
28800 ; refresh
7200 ; retry
604800 ; expire
86400 ; ttl
)

IN NS localhost.
sky IN MX 1 192.168.5.1
sky IN A 192.168.5.1

mahendra.com IN CNAME admin.mahendra.com.
host1 IN AAAA fe80::200:1cff:fe81:e1d0
redhat1 IN AAAA fe80::200:1cff:fe81:e1d0
penguin IN AAAA fe80::200:1cff:fe81:e1d0
node 2 IN A 192.168.5.4
node 1 IN A 192.168.5.3

Page 107

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