Examples of net.schmizz.sshj.SSHClient

net.schmizz.sshj.SSHClient
Secure SHell client API.
Before connection is established, host key verification needs to be accounted for. This is done by {@link #addHostKeyVerifier(HostKeyVerifier) specifying} one or more {@link HostKeyVerifier} objects. Database of knownhostname-key pairs in the OpenSSH {@code "known_hosts"} format can be {@link #loadKnownHosts(File) loaded} for hostkey verification.
User authentication can be performed by any of the {@code auth*()} method.
{@link #startSession()} caters to the most typical use case of starting a {@code session} channel and executing aremote command, starting a subsystem, etc. If you wish to request X11 forwarding for some session, first {@link #registerX11Forwarder(ConnectListener) register} a {@link ConnectListener} for {@code x11} channels.
{@link #newLocalPortForwarder Local} and {@link #getRemotePortForwarder() remote} port forwarding is possible. Thereare also utility method for easily creating {@link #newSCPFileTransfer SCP} and {@link #newSFTPClient() SFTP}implementations.
A simple example:
```
 client = new SSHClient(); client.initUserKnownHosts(); client.connect("hostname"); try { client.authPassword("username", "password"); final Session session = client.startSession(); try { final Command cmd = session.exec("true"); cmd.join(1, TimeUnit.SECONDS); } finally { session.close(); } finally { client.disconnect(); } 
```
Where a password or passphrase is required, if you're extra-paranoid use the {@code char[]} based method. The {@code char[]} will be blanked out after use.

  }


  public Session getSession(String hostAddress) throws IOException {
    try {
      if (sshClient == null) {
        sshClient = new SSHClient();
      }
      if (getSSHClient().isConnected())
        return getSSHClient().startSession();


      KeyProvider pkey = getSSHClient().loadKeys(getPrivateKeyLoc(), getKeyPass());

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    }
  }


  public SSHClient getSSHClient() {
    if (sshClient == null) {
      sshClient = new SSHClient();
    }
    return sshClient;
  }

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/** This example demonstrates how forwarding X11 connections from a remote host can be accomplished. */
public class X11 {


    public static void main(String... args)
            throws IOException, InterruptedException {
        final SSHClient ssh = new SSHClient();


        // Compression makes X11 more feasible over slower connections
        // ssh.useCompression();


        ssh.loadKnownHosts();


        /*
        * NOTE: Forwarding incoming X connections to localhost:6000 only works if X is started without the
        * "-nolisten tcp" option (this is usually not the default for good reason)
        */
        ssh.registerX11Forwarder(new SocketForwardingConnectListener(new InetSocketAddress("localhost", 6000)));


        ssh.connect("localhost");
        try {


            ssh.authPublickey(System.getProperty("user.name"));


            Session sess = ssh.startSession();


            /*
            * It is recommendable to send a fake cookie, and in your ConnectListener when a connection comes in replace
            * it with the real one. But here simply one from `xauth list` is being used.
            */
            sess.reqX11Forwarding("MIT-MAGIC-COOKIE-1", "b0956167c9ad8f34c8a2788878307dc9", 0);


            final Command cmd = sess.exec("/usr/X11/bin/xcalc");


            new StreamCopier(cmd.getInputStream(), System.out).spawn("stdout");
            new StreamCopier(cmd.getErrorStream(), System.err).spawn("stderr");


            // Wait for session & X11 channel to get closed
            ssh.getConnection().join();


        } finally {
            ssh.disconnect();
        }
    }

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/** This example demonstrates uploading of a file over SFTP to the SSH server. */
public class SFTPUpload {


    public static void main(String[] args)
            throws IOException {
        final SSHClient ssh = new SSHClient();
        ssh.loadKnownHosts();
        ssh.connect("localhost");
        try {
            ssh.authPublickey(System.getProperty("user.name"));
            final String src = System.getProperty("user.home") + File.separator + "test_file";
            final SFTPClient sftp = ssh.newSFTPClient();
            try {
                sftp.put(new FileSystemFile(src), "/tmp");
            } finally {
                sftp.close();
            }
        } finally {
            ssh.disconnect();
        }
    }

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class RudimentaryPTY {


    public static void main(String... args)
            throws IOException {


        final SSHClient ssh = new SSHClient();


        final File khFile = new File(OpenSSHKnownHosts.detectSSHDir(), "known_hosts");
        ssh.addHostKeyVerifier(new ConsoleKnownHostsVerifier(khFile, System.console()));


        ssh.connect("localhost");
        try {


            ssh.authPublickey(System.getProperty("user.name"));


            final Session session = ssh.startSession();
            try {


                session.allocateDefaultPTY();


                final Shell shell = session.startShell();


                new StreamCopier(shell.getInputStream(), System.out)
                        .bufSize(shell.getLocalMaxPacketSize())
                        .spawn("stdout");


                new StreamCopier(shell.getErrorStream(), System.err)
                        .bufSize(shell.getLocalMaxPacketSize())
                        .spawn("stderr");


                // Now make System.in act as stdin. To exit, hit Ctrl+D (since that results in an EOF on System.in)
                // This is kinda messy because java only allows console input after you hit return
                // But this is just an example... a GUI app could implement a proper PTY
                new StreamCopier(System.in, shell.getOutputStream())
                        .bufSize(shell.getRemoteMaxPacketSize())
                        .copy();


            } finally {
                session.close();
            }


        } finally {
            ssh.disconnect();
        }
    }

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/** This example demonstrates downloading of a file over SFTP from the SSH server. */
public class SFTPDownload {


    public static void main(String[] args)
            throws IOException {
        final SSHClient ssh = new SSHClient();
        ssh.loadKnownHosts();
        ssh.connect("localhost");
        try {
            ssh.authPublickey(System.getProperty("user.name"));
            final SFTPClient sftp = ssh.newSFTPClient();
            try {
                sftp.get("test_file", new FileSystemFile("/tmp"));
            } finally {
                sftp.close();
            }
        } finally {
            ssh.disconnect();
        }
    }

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 */
public class LocalPF {


    public static void main(String... args)
            throws IOException {
        SSHClient ssh = new SSHClient();


        ssh.loadKnownHosts();


        ssh.connect("localhost");
        try {


            ssh.authPublickey(System.getProperty("user.name"));


            /*
            * _We_ listen on localhost:8080 and forward all connections on to server, which then forwards it to
            * google.com:80
            */
            ssh.newLocalPortForwarder(new InetSocketAddress("localhost", 8080), "google.com", 80)
               .listen();


        } finally {
            ssh.disconnect();
        }
    }

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/** This example demonstrates uploading of a file over SCP to the SSH server. */
public class SCPUpload {


    public static void main(String[] args)
            throws IOException, ClassNotFoundException {
        SSHClient ssh = new SSHClient();
        ssh.loadKnownHosts();
        ssh.connect("localhost");
        try {
            ssh.authPublickey(System.getProperty("user.name"));


            // Present here to demo algorithm renegotiation - could have just put this before connect()
            // Make sure JZlib is in classpath for this to work
            ssh.useCompression();


            final String src = System.getProperty("user.home") + File.separator + "test_file";
            ssh.newSCPFileTransfer().upload(new FileSystemFile(src), "/tmp/");
        } finally {
            ssh.disconnect();
        }
    }

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/** This examples demonstrates how a remote command can be executed. */
public class Exec {


    public static void main(String... args)
            throws IOException {
        final SSHClient ssh = new SSHClient();
        ssh.loadKnownHosts();


        ssh.connect("localhost");
        try {
            ssh.authPublickey(System.getProperty("user.name"));
            final Session session = ssh.startSession();
            try {
                final Command cmd = session.exec("ping -c 1 google.com");
                System.out.println(IOUtils.readFully(cmd.getInputStream()).toString());
                cmd.join(5, TimeUnit.SECONDS);
                System.out.println("\n** exit status: " + cmd.getExitStatus());
            } finally {
                session.close();
            }
        } finally {
            ssh.disconnect();
        }
    }

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/** This example demonstrates downloading of a file over SCP from the SSH server. */
public class SCPDownload {


    public static void main(String[] args)
            throws IOException {
        SSHClient ssh = new SSHClient();
        // ssh.useCompression(); // Can lead to significant speedup (needs JZlib in classpath)
        ssh.loadKnownHosts();
        ssh.connect("localhost");
        try {
            ssh.authPublickey(System.getProperty("user.name"));
            ssh.newSCPFileTransfer().download("test_file", new FileSystemFile("/tmp/"));
        } finally {
            ssh.disconnect();
        }
    }

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