1 /* 2 * Copyright (c) 2006-2011 Christian Plattner. All rights reserved. 3 * Please refer to the LICENSE.txt for licensing details. 4 */ 5 import java.io.File; 6 import java.io.IOException; 7 8 import ch.ethz.ssh2.Connection; 9 import ch.ethz.ssh2.LocalPortForwarder; 10 11 public class PortForwarding 12 { 13 public static void sleepSomeTime(long milliSeconds) 14 { 15 try 16 { 17 Thread.sleep(milliSeconds); 18 } 19 catch (InterruptedException e) 20 { 21 } 22 } 23 24 public static void main(String[] args) 25 { 26 String hostname = "127.0.0.1"; 27 String username = "joe"; 28 29 File keyfile = new File("~/.ssh/id_rsa"); // or "~/.ssh/id_dsa" 30 String keyfilePass = "joespass"; // will be ignored if not needed 31 32 try 33 { 34 /* Create a connection instance */ 35 36 Connection conn = new Connection(hostname); 37 38 /* Now connect */ 39 40 conn.connect(); 41 42 /* Authenticate */ 43 44 boolean isAuthenticated = conn.authenticateWithPublicKey(username, keyfile, keyfilePass); 45 46 if (isAuthenticated == false) 47 throw new IOException("Authentication failed."); 48 49 /* ===== OK, now let's establish some local port forwardings ===== */ 50 51 /* Example Port Forwarding: -L 8080:www.ethz.ch:80 (OpenSSH notation) 52 * 53 * This works by allocating a socket to listen on 8080 on the local interface (127.0.0.1). 54 * Whenever a connection is made to this port (127.0.0.1:8080), the connection is forwarded 55 * over the secure channel, and a connection is made to www.ethz.ch:80 from the remote 56 * machine (i.e., the ssh server). 57 * 58 * (the above text is based partially on the OpenSSH man page) 59 */ 60 61 /* You can create as many of them as you want */ 62 63 LocalPortForwarder lpf1 = conn.createLocalPortForwarder(8080, "www.ethz.ch", 80); 64 65 /* Now simply point your webbrowser to 127.0.0.1:8080 */ 66 /* (on the host where you execute this program) */ 67 68 /* ===== OK, now let's establish some remote port forwardings ===== */ 69 70 /* Example Port Forwarding: -R 127.0.0.1:8080:www.ganymed.ethz.ch:80 (OpenSSH notation) 71 * 72 * Specifies that the port 127.0.0.1:8080 on the remote server is to be forwarded to the 73 * given host and port on the local side. This works by allocating a socket to listen to port 74 * 8080 on the remote side (the ssh server), and whenever a connection is made to this port, the 75 * connection is forwarded over the secure channel, and a connection is made to 76 * www.ganymed.ethz.ch:80 by the Ganymed SSH-2 library. 77 * 78 * (the above text is based partially on the OpenSSH man page) 79 */ 80 81 /* You can create as many of them as you want */ 82 83 conn.requestRemotePortForwarding("127.0.0.1", 8080, "www.ganymed.ethz.ch", 80); 84 85 /* Now, on the ssh server, if you connect to 127.0.0.1:8080, then the connection is forwarded 86 * through the secure tunnel to the library, which in turn will forward the connection 87 * to www.ganymed.ethz.ch:80. */ 88 89 /* Sleep a bit... (30 seconds) */ 90 sleepSomeTime(30000); 91 92 /* Stop accepting remote connections that are being forwarded to www.ganymed.ethz.ch:80 */ 93 94 conn.cancelRemotePortForwarding(8080); 95 96 /* Sleep a bit... (20 seconds) */ 97 sleepSomeTime(20000); 98 99 /* Stop accepting connections on 127.0.0.1:8080 that are being forwarded to www.ethz.ch:80 */ 100 101 lpf1.close(); 102 103 /* Close the connection */ 104 105 conn.close(); 106 107 } 108 catch (IOException e) 109 { 110 e.printStackTrace(System.err); 111 System.exit(2); 112 } 113 } 114 } 115
