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Diffstat (limited to 'examples/PortForwarding.java')
-rw-r--r-- | examples/PortForwarding.java | 114 |
1 files changed, 114 insertions, 0 deletions
diff --git a/examples/PortForwarding.java b/examples/PortForwarding.java new file mode 100644 index 0000000..cb6d8d5 --- /dev/null +++ b/examples/PortForwarding.java @@ -0,0 +1,114 @@ +/* + * Copyright (c) 2006-2011 Christian Plattner. All rights reserved. + * Please refer to the LICENSE.txt for licensing details. + */ +import java.io.File; +import java.io.IOException; + +import ch.ethz.ssh2.Connection; +import ch.ethz.ssh2.LocalPortForwarder; + +public class PortForwarding +{ + public static void sleepSomeTime(long milliSeconds) + { + try + { + Thread.sleep(milliSeconds); + } + catch (InterruptedException e) + { + } + } + + public static void main(String[] args) + { + String hostname = "127.0.0.1"; + String username = "joe"; + + File keyfile = new File("~/.ssh/id_rsa"); // or "~/.ssh/id_dsa" + String keyfilePass = "joespass"; // will be ignored if not needed + + try + { + /* Create a connection instance */ + + Connection conn = new Connection(hostname); + + /* Now connect */ + + conn.connect(); + + /* Authenticate */ + + boolean isAuthenticated = conn.authenticateWithPublicKey(username, keyfile, keyfilePass); + + if (isAuthenticated == false) + throw new IOException("Authentication failed."); + + /* ===== OK, now let's establish some local port forwardings ===== */ + + /* Example Port Forwarding: -L 8080:www.ethz.ch:80 (OpenSSH notation) + * + * This works by allocating a socket to listen on 8080 on the local interface (127.0.0.1). + * Whenever a connection is made to this port (127.0.0.1:8080), the connection is forwarded + * over the secure channel, and a connection is made to www.ethz.ch:80 from the remote + * machine (i.e., the ssh server). + * + * (the above text is based partially on the OpenSSH man page) + */ + + /* You can create as many of them as you want */ + + LocalPortForwarder lpf1 = conn.createLocalPortForwarder(8080, "www.ethz.ch", 80); + + /* Now simply point your webbrowser to 127.0.0.1:8080 */ + /* (on the host where you execute this program) */ + + /* ===== OK, now let's establish some remote port forwardings ===== */ + + /* Example Port Forwarding: -R 127.0.0.1:8080:www.ganymed.ethz.ch:80 (OpenSSH notation) + * + * Specifies that the port 127.0.0.1:8080 on the remote server is to be forwarded to the + * given host and port on the local side. This works by allocating a socket to listen to port + * 8080 on the remote side (the ssh server), and whenever a connection is made to this port, the + * connection is forwarded over the secure channel, and a connection is made to + * www.ganymed.ethz.ch:80 by the Ganymed SSH-2 library. + * + * (the above text is based partially on the OpenSSH man page) + */ + + /* You can create as many of them as you want */ + + conn.requestRemotePortForwarding("127.0.0.1", 8080, "www.ganymed.ethz.ch", 80); + + /* Now, on the ssh server, if you connect to 127.0.0.1:8080, then the connection is forwarded + * through the secure tunnel to the library, which in turn will forward the connection + * to www.ganymed.ethz.ch:80. */ + + /* Sleep a bit... (30 seconds) */ + sleepSomeTime(30000); + + /* Stop accepting remote connections that are being forwarded to www.ganymed.ethz.ch:80 */ + + conn.cancelRemotePortForwarding(8080); + + /* Sleep a bit... (20 seconds) */ + sleepSomeTime(20000); + + /* Stop accepting connections on 127.0.0.1:8080 that are being forwarded to www.ethz.ch:80 */ + + lpf1.close(); + + /* Close the connection */ + + conn.close(); + + } + catch (IOException e) + { + e.printStackTrace(System.err); + System.exit(2); + } + } +} |