Hello
I have created a class below which for the main part sets up a gui. The two bits of the code i am concerned about are below
Tcpdump td = new Tcpdump();
try
{
td.printOutput(text,text1);
}
catch(IOException e){
System.out.println("tcpdump err"
;}
and the code just below that that sets up a tcp socket - waits for connections and prints whatever is fed into the socket (text) to a textarea on the gui.
ServerSocket serverSocket = null;
try {
serverSocket = new ServerSocket(9800);
System.out.println("Opened port 9800"
} catch (IOException e) {
System.err.println("Could not listen on port: 9800."
System.exit(1);
}
Socket clientSocket = null;
try {
clientSocket = serverSocket.accept();
} catch (IOException e) {
System.err.println("Accept failed."
System.exit(1);
}
try{
BufferedReader in = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
String input;
while((input = in.readLine())!=null){text.append(input+"\n"}
}
catch(IOException e1){}
The problem i have got is two fold - first snippet of code (tcpdump and printoutput) is basically a java version of tcpdump - it sits in the background and prints everything coming off the nic. Because this is constantly running in the background the bit below this namely the creation of a tcp socket never executes. The socket code again is similar although it hangs while waiting for a client to connect. The problem i want to solve is how can i thread these two snippets of code. Also i the tcp socket currently waits for one connection - when it receives this i would like to be able to somehow deal with other connections - again another thread issue i guess- the problem is ive never really dealt with threads before and feel out of my depth. If anyone could point me in the way to go it would be appreciated. I would offer some duke dollars but sadly they ran out a while ago. I have posted the serverside1 code in its entierity below.
Many thanks
john
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import jpcap.*;
import java.io.*;
import java.net.*;
public class Serverside1 extends JFrame implements ActionListener
{
private JFrame window;
private MenuBar bar;
private MenuItem start, stop, save, sixteen, ten, twelve, fourteen, about, exit, help_top, clear;
private Menu textsize, capture, view, help;
private JTextArea text,text1;
private Tcpdump td;
private Font sixteen_pt, ten_pt, twelve_pt, fourteen_pt;
private Color color;
private BorderLayout layout;
private JFileChooser fc = new JFileChooser();
private FileOutputStream out;
private PrintStream p;
private File file;
private BufferedWriter bw;
private DatagramPacket sendPacket, receivePacket;
private DatagramSocket socket;
public Serverside1()
{
window = new JFrame("Network Packet Sniffer"
window.setSize(700,500);
window.setVisible(true);
window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
layout = new BorderLayout(5,5);
window.getContentPane().setLayout(layout);
text = new JTextArea("",18, 24);
text1 = new JTextArea("",5,10);
Color color = new Color(0,0,0);
Color color1 = new Color(0,255,0);
text.setBackground(color);
text.setLineWrap(false);
text.setEditable(false);
text.setWrapStyleWord(true);
text1.setBackground(color);
text.setForeground(color1);
text1.setForeground(color1);
text1.setLineWrap(true);
text1.setEditable(false);
text1.setWrapStyleWord(true);
text1.append(" Captured Packets \n\n"
text1.append(" TCP\t0\n"
text1.append(" UDP\t0\n"
text1.append(" ARP\t0\n"
text1.append(" ICMP\t0\n"
JScrollPane scrollingResult = new JScrollPane(text);
window.getContentPane().add(scrollingResult, BorderLayout.NORTH);
JScrollPane scrollingResult1 = new JScrollPane(text1);
window.getContentPane().add(scrollingResult1, BorderLayout.WEST);
window.show();
sixteen_pt = new Font("TimesRoman", Font.PLAIN, 16);
ten_pt = new Font("TimesRoman", Font.PLAIN, 10);
twelve_pt = new Font("TimesRoman", Font.PLAIN, 12);
fourteen_pt = new Font("TimesRoman", Font.PLAIN, 14);
bar = new MenuBar();
window.setMenuBar(bar);
about = new MenuItem("About"
help_top = new MenuItem("Help Topics"
start = new MenuItem("Start"
stop = new MenuItem("Stop"
save = new MenuItem("Save"
exit = new MenuItem("Exit"
clear = new MenuItem("Clear Screen"
sixteen = new MenuItem("16 pt"
ten = new MenuItem("10 pt"
twelve = new MenuItem("12 pt"
fourteen = new MenuItem("14 pt"
textsize = new Menu("Text Size"
capture = new Menu("Capture"
view = new Menu("View"
help = new Menu("Help"
capture.add(start);
capture.add(stop);
capture.add(save);
capture.add(exit);
textsize.add(ten);
textsize.add(twelve);
textsize.add(fourteen);
textsize.add(sixteen);
view.add(clear);
view.add(textsize);
help.add(help_top);
help.add(about);
bar.add(capture);
bar.add(view);
bar.add(help);
save.addActionListener(this);
clear.addActionListener(this);
ten.addActionListener(this);
twelve.addActionListener(this);
sixteen.addActionListener(this);
fourteen.addActionListener(this);
about.addActionListener(this);
exit.addActionListener(this);
window.setVisible(true);
try{
socket = new DatagramSocket(9876);
System.out.println("opened port 9876"
}
catch(SocketException se){
se.printStackTrace();
System.out.println("Couldn't open port"
System.exit(1);
}
Tcpdump td = new Tcpdump();
try
{
td.printOutput(text,text1);
}
catch(IOException e){
System.out.println("tcpdump err"}
ServerSocket serverSocket = null;
try {
serverSocket = new ServerSocket(9800);
System.out.println("Opened port 9800"
} catch (IOException e) {
System.err.println("Could not listen on port: 9800."
System.exit(1);
}
Socket clientSocket = null;
try {
clientSocket = serverSocket.accept();
} catch (IOException e) {
System.err.println("Accept failed."
System.exit(1);
}
try{
BufferedReader in = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
String input;
while((input = in.readLine())!=null){text.append(input+"\n"}
}
catch(IOException e1){}
}
public void actionPerformed(ActionEvent e){
if (e.getSource()==sixteen)
{
text.setFont(sixteen_pt);
text.repaint();
}
else if (e.getSource()==ten)
{
text.setFont(ten_pt);
text.repaint();
}
else if (e.getSource()==twelve)
{
text.setFont(twelve_pt);
text.repaint();
}
else if (e.getSource()==fourteen)
{
text.setFont(fourteen_pt);
text.repaint();
}
else if (e.getSource()==clear)
{
text.setText(""
}
else if (e.getSource()==save)
{
int returnVal = fc.showSaveDialog(Serverside1.this);
File file = null;
if (returnVal == JFileChooser.APPROVE_OPTION) {
file = fc.getSelectedFile();
}
try
{
out = new FileOutputStream(file);
p = new PrintStream( out );
p.println (text.getText());
p.close();
}
catch (Exception f)
{System.err.println ("Error writing to file"}
}
else if(e.getSource()==about)
{
JOptionPane.showMessageDialog(window,
"TCP/IP Simulator Version 1.0 2003\nCreated by John O'Meara <omearajohn@hotmail.com>"
}
else if(e.getSource()==exit)
{System.exit(0);}
}
}
I have created a class below which for the main part sets up a gui. The two bits of the code i am concerned about are below
Tcpdump td = new Tcpdump();
try
{
td.printOutput(text,text1);
}
catch(IOException e){
System.out.println("tcpdump err"
;} and the code just below that that sets up a tcp socket - waits for connections and prints whatever is fed into the socket (text) to a textarea on the gui.
ServerSocket serverSocket = null;
try {
serverSocket = new ServerSocket(9800);
System.out.println("Opened port 9800"
;} catch (IOException e) {
System.err.println("Could not listen on port: 9800."
;System.exit(1);
}
Socket clientSocket = null;
try {
clientSocket = serverSocket.accept();
} catch (IOException e) {
System.err.println("Accept failed."
;System.exit(1);
}
try{
BufferedReader in = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
String input;
while((input = in.readLine())!=null){text.append(input+"\n"
;}}
catch(IOException e1){}
The problem i have got is two fold - first snippet of code (tcpdump and printoutput) is basically a java version of tcpdump - it sits in the background and prints everything coming off the nic. Because this is constantly running in the background the bit below this namely the creation of a tcp socket never executes. The socket code again is similar although it hangs while waiting for a client to connect. The problem i want to solve is how can i thread these two snippets of code. Also i the tcp socket currently waits for one connection - when it receives this i would like to be able to somehow deal with other connections - again another thread issue i guess- the problem is ive never really dealt with threads before and feel out of my depth. If anyone could point me in the way to go it would be appreciated. I would offer some duke dollars but sadly they ran out a while ago. I have posted the serverside1 code in its entierity below.
Many thanks
john
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import jpcap.*;
import java.io.*;
import java.net.*;
public class Serverside1 extends JFrame implements ActionListener
{
private JFrame window;
private MenuBar bar;
private MenuItem start, stop, save, sixteen, ten, twelve, fourteen, about, exit, help_top, clear;
private Menu textsize, capture, view, help;
private JTextArea text,text1;
private Tcpdump td;
private Font sixteen_pt, ten_pt, twelve_pt, fourteen_pt;
private Color color;
private BorderLayout layout;
private JFileChooser fc = new JFileChooser();
private FileOutputStream out;
private PrintStream p;
private File file;
private BufferedWriter bw;
private DatagramPacket sendPacket, receivePacket;
private DatagramSocket socket;
public Serverside1()
{
window = new JFrame("Network Packet Sniffer"
;window.setSize(700,500);
window.setVisible(true);
window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
layout = new BorderLayout(5,5);
window.getContentPane().setLayout(layout);
text = new JTextArea("",18, 24);
text1 = new JTextArea("",5,10);
Color color = new Color(0,0,0);
Color color1 = new Color(0,255,0);
text.setBackground(color);
text.setLineWrap(false);
text.setEditable(false);
text.setWrapStyleWord(true);
text1.setBackground(color);
text.setForeground(color1);
text1.setForeground(color1);
text1.setLineWrap(true);
text1.setEditable(false);
text1.setWrapStyleWord(true);
text1.append(" Captured Packets \n\n"
;text1.append(" TCP\t0\n"
;text1.append(" UDP\t0\n"
;text1.append(" ARP\t0\n"
;text1.append(" ICMP\t0\n"
;JScrollPane scrollingResult = new JScrollPane(text);
window.getContentPane().add(scrollingResult, BorderLayout.NORTH);
JScrollPane scrollingResult1 = new JScrollPane(text1);
window.getContentPane().add(scrollingResult1, BorderLayout.WEST);
window.show();
sixteen_pt = new Font("TimesRoman", Font.PLAIN, 16);
ten_pt = new Font("TimesRoman", Font.PLAIN, 10);
twelve_pt = new Font("TimesRoman", Font.PLAIN, 12);
fourteen_pt = new Font("TimesRoman", Font.PLAIN, 14);
bar = new MenuBar();
window.setMenuBar(bar);
about = new MenuItem("About"
;help_top = new MenuItem("Help Topics"
;start = new MenuItem("Start"
;stop = new MenuItem("Stop"
;save = new MenuItem("Save"
;exit = new MenuItem("Exit"
;clear = new MenuItem("Clear Screen"
;sixteen = new MenuItem("16 pt"
;ten = new MenuItem("10 pt"
;twelve = new MenuItem("12 pt"
;fourteen = new MenuItem("14 pt"
;textsize = new Menu("Text Size"
;capture = new Menu("Capture"
;view = new Menu("View"
;help = new Menu("Help"
;capture.add(start);
capture.add(stop);
capture.add(save);
capture.add(exit);
textsize.add(ten);
textsize.add(twelve);
textsize.add(fourteen);
textsize.add(sixteen);
view.add(clear);
view.add(textsize);
help.add(help_top);
help.add(about);
bar.add(capture);
bar.add(view);
bar.add(help);
save.addActionListener(this);
clear.addActionListener(this);
ten.addActionListener(this);
twelve.addActionListener(this);
sixteen.addActionListener(this);
fourteen.addActionListener(this);
about.addActionListener(this);
exit.addActionListener(this);
window.setVisible(true);
try{
socket = new DatagramSocket(9876);
System.out.println("opened port 9876"
;}
catch(SocketException se){
se.printStackTrace();
System.out.println("Couldn't open port"
;System.exit(1);
}
Tcpdump td = new Tcpdump();
try
{
td.printOutput(text,text1);
}
catch(IOException e){
System.out.println("tcpdump err"
;}ServerSocket serverSocket = null;
try {
serverSocket = new ServerSocket(9800);
System.out.println("Opened port 9800"
;} catch (IOException e) {
System.err.println("Could not listen on port: 9800."
;System.exit(1);
}
Socket clientSocket = null;
try {
clientSocket = serverSocket.accept();
} catch (IOException e) {
System.err.println("Accept failed."
;System.exit(1);
}
try{
BufferedReader in = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
String input;
while((input = in.readLine())!=null){text.append(input+"\n"
;}}
catch(IOException e1){}
}
public void actionPerformed(ActionEvent e){
if (e.getSource()==sixteen)
{
text.setFont(sixteen_pt);
text.repaint();
}
else if (e.getSource()==ten)
{
text.setFont(ten_pt);
text.repaint();
}
else if (e.getSource()==twelve)
{
text.setFont(twelve_pt);
text.repaint();
}
else if (e.getSource()==fourteen)
{
text.setFont(fourteen_pt);
text.repaint();
}
else if (e.getSource()==clear)
{
text.setText(""
;}
else if (e.getSource()==save)
{
int returnVal = fc.showSaveDialog(Serverside1.this);
File file = null;
if (returnVal == JFileChooser.APPROVE_OPTION) {
file = fc.getSelectedFile();
}
try
{
out = new FileOutputStream(file);
p = new PrintStream( out );
p.println (text.getText());
p.close();
}
catch (Exception f)
{System.err.println ("Error writing to file"
;}}
else if(e.getSource()==about)
{
JOptionPane.showMessageDialog(window,
"TCP/IP Simulator Version 1.0 2003\nCreated by John O'Meara <omearajohn@hotmail.com>"
;}
else if(e.getSource()==exit)
{System.exit(0);}
}
}