/* -*-mode:java; c-basic-offset:2; indent-tabs-mode:nil -*- */ /** * This program will demonstrate the port forwarding like option -L of * ssh command; the given port on the local host will be forwarded to * the given remote host and port on the remote side. * $ CLASSPATH=.:../build javac PortForwardingL.java * $ CLASSPATH=.:../build java PortForwardingL * 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 localhost. * */ import com.jcraft.jsch.*; import java.awt.*; import javax.swing.*; public class PortForwardingL{ public static void main(String[] arg){ int lport; String rhost; 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 -L port:host:hostport", "port:host:hostport"); lport=Integer.parseInt(foo.substring(0, foo.indexOf(':'))); foo=foo.substring(foo.indexOf(':')+1); rhost=foo.substring(0, foo.indexOf(':')); rport=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(); int assinged_port=session.setPortForwardingL(lport, rhost, rport); System.out.println("localhost:"+assinged_port+" -> "+rhost+":"+rport); } catch(Exception e){ System.out.println(e); } } public static class MyUserInfo implements UserInfo, UIKeyboardInteractive{ public String getPassword(){ return passwd; } 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=(JTextField)new JPasswordField(20); public String getPassphrase(){ return null; } public boolean promptPassphrase(String message){ return true; } 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; } } 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; 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