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/**
* This program will demonstrate how to provide a network service like inetd by using remote
* port-forwarding functionality.
*/
import com.jcraft.jsch.ChannelForwardedTCPIP;
import com.jcraft.jsch.ForwardedTCPIPDaemon;
import com.jcraft.jsch.JSch;
import com.jcraft.jsch.JSchException;
import com.jcraft.jsch.Session;
import com.jcraft.jsch.UIKeyboardInteractive;
import com.jcraft.jsch.UserInfo;
import java.awt.Container;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JPasswordField;
import javax.swing.JTextField;
public class Daemon {
public static void main(String[] arg) {
int rport;
try {
JSch jsch = new JSch();
String host = null;
if (arg.length > 0) {
host = arg[0];
} else {
host = JOptionPane.showInputDialog("Enter username@hostname",
System.getProperty("user.name") + "@localhost");
}
String user = host.substring(0, host.indexOf('@'));
host = host.substring(host.indexOf('@') + 1);
Session session = jsch.getSession(user, host, 22);
String foo = JOptionPane.showInputDialog("Enter remote port number", "8888");
rport = Integer.parseInt(foo);
// username and password will be given via UserInfo interface.
UserInfo ui = new MyUserInfo();
session.setUserInfo(ui);
session.connect();
// session.setPortForwardingR(rport, Parrot.class.getName());
session.setPortForwardingR(rport, "Daemon$Parrot");
System.out.println(host + ":" + rport + " <--> " + "Parrot");
} catch (Exception e) {
System.out.println(e);
}
}
public static class Parrot implements ForwardedTCPIPDaemon {
ChannelForwardedTCPIP channel;
Object[] arg;
InputStream in;
OutputStream out;
@Override
public void setChannel(ChannelForwardedTCPIP c, InputStream in, OutputStream out) {
this.channel = c;
this.in = in;
this.out = out;
}
@Override
public void setArg(Object[] arg) {
this.arg = arg;
}
@Override
public void run() {
try {
byte[] buf = new byte[1024];
System.out.println("remote port: " + channel.getRemotePort());
System.out.println("remote host: " + channel.getSession().getHost());
while (true) {
int i = in.read(buf, 0, buf.length);
if (i <= 0)
break;
out.write(buf, 0, i);
out.flush();
if (buf[0] == '.')
break;
}
} catch (JSchException e) {
System.out.println("session is down.");
} catch (IOException e) {
}
}
}
public static class MyUserInfo implements UserInfo, UIKeyboardInteractive {
@Override
public String getPassword() {
return passwd;
}
@Override
public boolean promptYesNo(String str) {
Object[] options = {"yes", "no"};
int foo = JOptionPane.showOptionDialog(null, str, "Warning", JOptionPane.DEFAULT_OPTION,
JOptionPane.WARNING_MESSAGE, null, options, options[0]);
return foo == 0;
}
String passwd;
JTextField passwordField = new JPasswordField(20);
@Override
public String getPassphrase() {
return null;
}
@Override
public boolean promptPassphrase(String message) {
return true;
}
@Override
public boolean promptPassword(String message) {
Object[] ob = {passwordField};
int result = JOptionPane.showConfirmDialog(null, ob, message, JOptionPane.OK_CANCEL_OPTION);
if (result == JOptionPane.OK_OPTION) {
passwd = passwordField.getText();
return true;
} else {
return false;
}
}
@Override
public void showMessage(String message) {
JOptionPane.showMessageDialog(null, message);
}
final GridBagConstraints gbc = new GridBagConstraints(0, 0, 1, 1, 1, 1,
GridBagConstraints.NORTHWEST, GridBagConstraints.NONE, new Insets(0, 0, 0, 0), 0, 0);
private Container panel;
@Override
public String[] promptKeyboardInteractive(String destination, String name, String instruction,
String[] prompt, boolean[] echo) {
panel = new JPanel();
panel.setLayout(new GridBagLayout());
gbc.weightx = 1.0;
gbc.gridwidth = GridBagConstraints.REMAINDER;
gbc.gridx = 0;
panel.add(new JLabel(instruction), gbc);
gbc.gridy++;
gbc.gridwidth = GridBagConstraints.RELATIVE;
JTextField[] texts = new JTextField[prompt.length];
for (int i = 0; i < prompt.length; i++) {
gbc.fill = GridBagConstraints.NONE;
gbc.gridx = 0;
gbc.weightx = 1;
panel.add(new JLabel(prompt[i]), gbc);
gbc.gridx = 1;
gbc.fill = GridBagConstraints.HORIZONTAL;
gbc.weighty = 1;
if (echo[i]) {
texts[i] = new JTextField(20);
} else {
texts[i] = new JPasswordField(20);
}
panel.add(texts[i], gbc);
gbc.gridy++;
}
if (JOptionPane.showConfirmDialog(null, panel, destination + ": " + name,
JOptionPane.OK_CANCEL_OPTION, JOptionPane.QUESTION_MESSAGE) == JOptionPane.OK_OPTION) {
String[] response = new String[prompt.length];
for (int i = 0; i < prompt.length; i++) {
response[i] = texts[i].getText();
}
return response;
} else {
return null; // cancel
}
}
}
}
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