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269 lines
10 KiB
269 lines
10 KiB
package de.anomic.server;
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import java.io.IOException;
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import com.jcraft.jsch.JSch;
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import com.jcraft.jsch.ProxyHTTP;
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import com.jcraft.jsch.Session;
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import com.jcraft.jsch.UIKeyboardInteractive;
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import com.jcraft.jsch.UserInfo;
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import de.anomic.server.logging.serverLog;
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public class serverPortForwardingSch implements serverPortForwarding{
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/* ========================================================================
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* Constants needed to read properties from the configuration file
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* ======================================================================== */
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public static final String FORWARDING_HOST = "portForwardingHost";
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public static final String FORWARDING_HOST_PORT = "portForwardingHostPort";
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public static final String FORWARDING_HOST_USER = "portForwardingHostUser";
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public static final String FORWARDING_HOST_PWD = "portForwardingHostPwd";
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public static final String FORWARDING_PORT = "portForwardingPort";
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public static final String FORWARDING_USE_PROXY = "portForwardingUseProxy";
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/* ========================================================================
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* Other object fields
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* ======================================================================== */
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private serverSwitch switchboard;
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private String forwardingHost;
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private int forwardingHostPort;
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private String forwardingHostUser;
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private String forwardingHostPwd;
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private int forwardingPort;
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private boolean useProxy;
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private String remoteProxyHost;
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private int remoteProxyPort;
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private String localHost;
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private int localHostPort;
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private static Session session;
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private static serverInstantThread sessionWatcher;
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private serverLog log;
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public serverPortForwardingSch() {
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super();
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this.log = new serverLog("PORT_FORWARDING_SCH");
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}
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public void init(
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serverSwitch switchboard,
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String localHost,
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int localPort
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) throws Exception {
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try {
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this.log.logDebug("Initializing port forwarding via sch ...");
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this.switchboard = switchboard;
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this.forwardingHost = switchboard.getConfig(FORWARDING_HOST,"localhost");
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this.forwardingHostPort = Integer.valueOf(switchboard.getConfig(FORWARDING_HOST_PORT,"8080")).intValue();
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this.forwardingHostUser = switchboard.getConfig(FORWARDING_HOST_USER,"xxx");
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this.forwardingHostPwd = switchboard.getConfig(FORWARDING_HOST_PWD,"xxx");
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this.forwardingPort = Integer.valueOf(switchboard.getConfig(FORWARDING_PORT,"8080")).intValue();
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this.useProxy = Boolean.valueOf(switchboard.getConfig(FORWARDING_USE_PROXY,"false")).booleanValue();
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this.localHost = localHost;
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this.localHostPort = localPort;
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// load remote proxy data
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this.remoteProxyHost = switchboard.getConfig("remoteProxyHost","");
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try {
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this.remoteProxyPort = Integer.parseInt(switchboard.getConfig("remoteProxyPort","3128"));
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} catch (NumberFormatException e) {
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remoteProxyPort = 3128;
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}
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// checking if all needed libs are availalbe
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String javaClassPath = System.getProperty("java.class.path");
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if (javaClassPath.indexOf("jsch") == -1) {
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throw new IllegalStateException("Missing library.");
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}
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} catch (Exception e) {
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this.log.logFailure("Unable to initialize port forwarding.",e);
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throw e;
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}
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}
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public String getHost() {
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return this.forwardingHost;
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}
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public int getPort() {
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return this.forwardingPort;
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}
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public synchronized void connect() throws IOException {
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try{
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if ((session != null) && (session.isConnected()))
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throw new IOException("Session already connected");
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this.log.logInfo("Trying to connect to remote port forwarding host " + this.forwardingHostUser + "@" + this.forwardingHost + ":" + this.forwardingHostPort);
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JSch jsch=new JSch();
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session=jsch.getSession(this.forwardingHostUser, this.forwardingHost, this.forwardingHostPort);
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session.setPassword(this.forwardingHostPwd);
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/*
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* Setting the StrictHostKeyChecking to ignore unknown
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* hosts because of a missing known_hosts file ...
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*/
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java.util.Properties config = new java.util.Properties();
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config.put("StrictHostKeyChecking","no");
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session.setConfig(config);
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// setting the proxy that should be used
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if (this.useProxy) {
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session.setProxy(new ProxyHTTP(this.remoteProxyHost, this.remoteProxyPort));
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}
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// username and password will be given via UserInfo interface.
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UserInfo ui= new MyUserInfo(this.forwardingHostPwd);
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session.setUserInfo(ui);
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// trying to connect ...
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session.connect();
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// activating remote port forwarding
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session.setPortForwardingR(this.forwardingPort, this.localHost, this.localHostPort);
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// using a timer task to control if the session remains open
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if (sessionWatcher == null) {
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this.log.logDebug("Deploying port forwarding session watcher thread.");
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this.switchboard.deployThread("portForwardingWatcher", "Remote Port Forwarding Watcher", "this thread is used to detect broken connections and to re-establish it if necessary.",
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sessionWatcher = new serverInstantThread(this, "reconnect", null), 30000,30000,30000,1000);
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sessionWatcher.setSyncObject(new Object());
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}
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this.log.logInfo("Remote port forwarding connection established: " +
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this.forwardingHost+ ":" + this.forwardingPort + " -> " +
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this.localHost + ":" + this.localHostPort);
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}
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catch(Exception e){
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this.log.logError("Unable to connect to remote port forwarding host.",e);
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throw new IOException(e.getMessage());
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}
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}
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public synchronized boolean reconnect() throws IOException {
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if ((!this.isConnected()) && (!Thread.currentThread().isInterrupted())) {
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this.log.logDebug("Trying to reconnect to port forwarding host.");
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this.connect();
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return this.isConnected();
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}
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return false;
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}
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public synchronized void disconnect() throws IOException {
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if (session == null) throw new IOException("No connection established.");
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// terminating port watcher thread
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this.log.logDebug("Terminating port forwarding session watcher thread.");
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this.switchboard.terminateThread("portForwardingWatcher",true);
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sessionWatcher = null;
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// disconnection the session
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try {
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session.disconnect();
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this.log.logDebug("Successfully disconnected from port forwarding host.");
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} catch (Exception e) {
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this.log.logError("Error while trying to disconnect from port forwarding host.",e);
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throw new IOException(e.getMessage());
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}
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}
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public synchronized boolean isConnected() {
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if (session == null) return false;
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return session.isConnected();
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}
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class MyUserInfo
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implements UserInfo, UIKeyboardInteractive {
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String passwd;
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public MyUserInfo(String password) {
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this.passwd = password;
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}
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public String getPassword() {
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return this.passwd;
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}
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public boolean promptYesNo(String str){
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System.err.println("User was prompted from: " + str);
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return true;
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}
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public String getPassphrase() {
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return null;
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}
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public boolean promptPassphrase(String message) {
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System.out.println("promptPassphrase : " + message);
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return false;
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}
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public boolean promptPassword(String message) {
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System.out.println("promptPassword : " + message);
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return true;
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}
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/**
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* @see com.jcraft.jsch.UserInfo#showMessage(java.lang.String)
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*/
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public void showMessage(String message) {
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System.out.println("Sch has tried to show the following message to the user: " + message);
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}
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public String[] promptKeyboardInteractive(String destination,
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String name,
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String instruction,
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String[] prompt,
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boolean[] echo) {
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System.out.println("User was prompted using interactive-keyboard: " +
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"\n\tDestination: " + destination +
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"\n\tName: " + name +
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"\n\tInstruction: " + instruction +
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"\n\tPrompt: " + arrayToString2(prompt,"|") +
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"\n\techo: " + arrayToString2(echo,"|"));
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if ((prompt.length >= 1) && (prompt[0].startsWith("Password")))
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return new String[]{this.passwd};
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return new String[]{};
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}
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String arrayToString2(String[] a, String separator) {
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StringBuffer result = new StringBuffer();// start with first element
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if (a.length > 0) {
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result.append(a[0]);
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for (int i=1; i<a.length; i++) {
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result.append(separator);
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result.append(a[i]);
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}
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}
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return result.toString();
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}
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String arrayToString2(boolean[] a, String separator) {
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StringBuffer result = new StringBuffer();// start with first element
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if (a.length > 0) {
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result.append(a[0]);
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for (int i=1; i<a.length; i++) {
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result.append(separator);
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result.append(a[i]);
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}
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}
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return result.toString();
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}
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}
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}
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