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/**
* This program will demonstrate the port forwarding like option -R of ssh command; the given port
* on the remote host will be forwarded to the given host and port on the local side. You will be
* asked username, hostname, port:host:hostport and passwd. If everything works fine, you will get
* the shell prompt. Try the port on remote host.
*/
import com.jcraft.jsch.JSch;
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 javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JPasswordField;
import javax.swing.JTextField;
public class PortForwardingR {
public static void main(String[] arg) {
int rport;
String lhost;
int lport;
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 -R port:host:hostport", "port:host:hostport");
rport = Integer.parseInt(foo.substring(0, foo.indexOf(':')));
foo = foo.substring(foo.indexOf(':') + 1);
lhost = foo.substring(0, foo.indexOf(':'));
lport = Integer.parseInt(foo.substring(foo.indexOf(':') + 1));
// username and password will be given via UserInfo interface.
UserInfo ui = new MyUserInfo();
session.setUserInfo(ui);
session.connect();
// Channel channel = session.openChannel("shell");
// channel.connect();
session.setPortForwardingR(rport, lhost, lport);
System.out.println(host + ":" + rport + " -> " + lhost + ":" + lport);
} catch (Exception e) {
System.out.println(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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