(Chilkat for Android™ API)
SSH Tunnel (Port Forwarding via direct-tcpip channel)

Demonstrates how to create an SSH tunnel to a remote hostname:port via a direct-tcpip channel.

Download: Chilkat for Android™ Java Libraries

// Important: Don't forget to include the call to System.loadLibrary
// as shown at the bottom of this code sample.
package com.test;

import android.app.Activity;
import com.chilkatsoft.*;

import android.widget.TextView;
import android.os.Bundle;

public class SimpleActivity extends Activity {
  // Called when the activity is first created.
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    TextView tv = new TextView(this);
    String outStr = "";

    //  Important: It is helpful to send the contents of the
    //  ssh.LastErrorText property when requesting support.

    CkSsh ssh = new CkSsh();

    //  Any string automatically begins a fully-functional 30-day trial.
    boolean success;
    success = ssh.UnlockComponent("Anything for 30-day trial");
    if (success != true) {
        outStr += ssh.lastErrorText() + "\n";
        tv.setText(outStr);
        setContentView(tv);
        return;
    }

    //  Connect to an SSH server:
    String hostname;
    int port;

    //  Hostname may be an IP address or hostname:
    hostname = "192.168.1.117";
    port = 22;

    success = ssh.Connect(hostname,port);
    if (success != true) {
        outStr += ssh.lastErrorText() + "\n";
        tv.setText(outStr);
        setContentView(tv);
        return;
    }

    //  Wait a max of 5 seconds when reading responses..
    ssh.put_IdleTimeoutMs(5000);

    //  Authenticate using login/password:
    success = ssh.AuthenticatePw("chilkat","myPassword");
    if (success != true) {
        outStr += ssh.lastErrorText() + "\n";
        tv.setText(outStr);
        setContentView(tv);
        return;
    }

    //  Open a direct-tcpip channel.  We want the SSH server to connect
    //  to www.chilkatsoft.com, port 80 (i.e. the web server).
    //  Data sent through the SSH tunnel is forwarded to the remote
    //  host:port.  (Note: The remote host:port does not need to be
    //  a web server.  It can be anything.  It can be your own
    //  customer application server that listens on a port, or any
    //  other type of server.)
    //  When we read from the SSH channel, we'll be reading data
    //  sent from the remote host:port (i.e. the web server in this
    //  example).
    int channelNum;
    channelNum = ssh.OpenDirectTcpIpChannel("www.chilkatsoft.com",80);
    if (channelNum < 0) {
        outStr += ssh.lastErrorText() + "\n";
        tv.setText(outStr);
        setContentView(tv);
        return;
    }

    //  Build a simple HTTP GET request for http://www.chilkatsoft.com/xyz.html
    String httpReq;
    httpReq = "GET /xyz123.html HTTP/1.1\r\nHost: www.chilkatsoft.com\r\n\r\n";

    //  Send the HTTP request:
    success = ssh.ChannelSendString(channelNum,httpReq,"ansi");
    if (success != true) {
        outStr += ssh.lastErrorText() + "\n";
        tv.setText(outStr);
        setContentView(tv);
        return;
    }

    //  Get the HTTP response.
    //  First read the HTTP response header which ends with a double CRLF.
    //  Calling ChannelReceiveUntilMatch will receive until match string is seen,
    //  or until a timeout occurs (IdleTimeoutMs property).  ChannelReceiveUntilMatch
    //  may read beyond the match string, but it will stop reading as soon as the match
    //  string is seen.
    boolean caseSensitive;
    caseSensitive = false;
    String matchStr;
    matchStr = "\r\n\r\n";
    success = ssh.ChannelReceiveUntilMatch(channelNum,matchStr,"ansi",caseSensitive);
    if (success != true) {
        outStr += ssh.lastErrorText() + "\n";
        tv.setText(outStr);
        setContentView(tv);
        return;
    }

    //  Extract the HTTP header from the receive buffer.
    //  (GetReceiveTextS extracts up to and including the match string from the receive buffer)
    String responseHeader;
    responseHeader = ssh.getReceivedTextS(channelNum,matchStr,"ansi");
    outStr += "---- HTTP Response Header ----" + "\n";
    outStr += responseHeader + "\n";

    //  Now get the body of the HTTP response (this is the HTML content
    //  of http://www.chilkatsoft.com/xyz.html
    //  It's possible we've already received the entire HTTP response in the
    //  call to ChannelReceiveUntilMatch.  Therefore, we'll poll for any remaining data
    //  and wait a max of .2 seconds.
    int numBytesRead;
    int pollTimeoutMs;
    pollTimeoutMs = 200;
    numBytesRead = ssh.ChannelPoll(channelNum,pollTimeoutMs);
    //  We're not checking for an error here.
    //  A return value of -2 means that no data was available and the poll simply timed out (not an error)
    //  A return value of -1 indicates an error.
    //  A return value greater than 0 indicates that additional data was received.

    outStr += "---- HTML BODY ----" + "\n";

    //  Extract the remainder of the accumulated data in the internal receive buffer.
    //  This should be our HTML body:
    String htmlBody;
    htmlBody = ssh.getReceivedText(channelNum,"ansi");
    outStr += htmlBody + "\n";

    //  Close the channel:
    success = ssh.ChannelSendClose(channelNum);
    if (success != true) {
        outStr += ssh.lastErrorText() + "\n";
        tv.setText(outStr);
        setContentView(tv);
        return;
    }

    //  Disconnect
    ssh.Disconnect();
    tv.setText(outStr);
    setContentView(tv);
  }

  static {
      // Important: Make sure the name passed to loadLibrary matches the shared library
      // found in your project's libs/armeabi directory.
      //  for "libchilkat.so", pass "chilkat" to loadLibrary
      //  for "libchilkatemail.so", pass "chilkatemail" to loadLibrary
      //  etc.
      // 
      System.loadLibrary("chilkat");

      // Note: If the incorrect library name is passed to System.loadLibrary,
      // then you will see the following error message at application startup:
      //"The application <your-application-name> has stopped unexpectedly. Please try again."
  }
}