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package makhin.mykola.minor.utils.routerreset;

import java.awt.BorderLayout;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.IOException;
import java.net.InetAddress;
import java.net.Socket;
import java.net.UnknownHostException;
import java.security.SecureRandom;
import java.text.SimpleDateFormat;
import java.util.Date;
import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLSocketFactory;
import javax.net.ssl.TrustManager;
import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JPasswordField;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;
import javax.swing.border.EmptyBorder;
import org.apache.commons.httpclient.ConnectTimeoutException;
import org.apache.commons.httpclient.Credentials;
import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.MultiThreadedHttpConnectionManager;
import org.apache.commons.httpclient.URI;
import org.apache.commons.httpclient.UsernamePasswordCredentials;
import org.apache.commons.httpclient.auth.AuthScope;
import org.apache.commons.httpclient.methods.GetMethod;
import org.apache.commons.httpclient.methods.PostMethod;
import org.apache.commons.httpclient.params.HttpConnectionParams;
import org.apache.commons.httpclient.protocol.Protocol;
import org.apache.commons.httpclient.protocol.ProtocolSocketFactory;

/**
 * @author Mykola Makhin
 * @version 0.2
 */
public class RouterResetUtil extends JComponent {

private static final long serialVersionUID = -6196217426008036402L;
	
	public static final int WAIT_TIME = 30000;

public static void main(String[] args) {
		JFrame frame = new JFrame("Router resetter");
		frame.getContentPane().setLayout(new BorderLayout());
		frame.getContentPane().add(new RouterResetUtil(), BorderLayout.CENTER);
		frame.pack();
		frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
		frame.setVisible(true);		
	}
	
	public RouterResetUtil() {
		initGui();
		initNet();
	}
	
	protected void error(final Throwable t) {
		t.printStackTrace();
		SwingUtilities.invokeLater(new Runnable() {
			public void run() {
				JOptionPane.showMessageDialog(RouterResetUtil.this, "Error "+t.getClass().getName()+" occured: "+t.getMessage(), "Error", JOptionPane.ERROR_MESSAGE);				
			}
		});
	}
	
	protected SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy.MM.dd HH:mm:ss S");
	protected void log(String message) {
		System.out.println("["+dateFormat.format(new Date())+"]: "+message);
	}
	
	// ## GUI start
	// TODO: move to separate GUI class
	protected JPanel pnlRouterParams = new JPanel();
	protected JTextField tfRouterHost = new JTextField("192.168.1.1");
	protected JTextField tfRouterLogin = new JTextField("admin");
	protected JPasswordField tfRouterPass = new JPasswordField("admin");
	protected JComboBox cbProtocol = new JComboBox();
	protected JPanel pnlStatusLog = new JPanel();
	protected JTextField tfStatus = new JTextField();
	protected JTextArea taLog = new JTextArea();
	protected JButton btnSave = new JButton("Save");
	protected JButton btnTest = new JButton("Test");
	
	protected ButtonsHandler buttonsHandler = new ButtonsHandler();
	protected static final String ACT_SAVE = "ACT_SAVE";
	protected static final String ACT_TEST = "ACT_TEST";
	
	public void initGui() {
		
		// Init components
		cbProtocol.addItem("HTTP");
		cbProtocol.addItem("HTTPS");
		btnSave.addActionListener(buttonsHandler);
		btnSave.setActionCommand(ACT_SAVE);
		btnTest.addActionListener(buttonsHandler);
		btnTest.setActionCommand(ACT_TEST);
		
		tfStatus.setEditable(false);
		taLog.setEditable(false);

// Init config panel
		pnlRouterParams.setLayout(new GridLayout(5,2));
		pnlRouterParams.add(new JLabel("Router host")); pnlRouterParams.add(tfRouterHost);
		pnlRouterParams.add(new JLabel("Protocol")); pnlRouterParams.add(cbProtocol);
		pnlRouterParams.add(new JLabel("Login")); pnlRouterParams.add(tfRouterLogin);
		pnlRouterParams.add(new JLabel("Password")); pnlRouterParams.add(tfRouterPass);
		pnlRouterParams.add(btnTest); pnlRouterParams.add(btnSave);
		
		// Init status/log panel
		pnlStatusLog.setLayout(new BorderLayout());
		pnlStatusLog.add(tfStatus, BorderLayout.NORTH);
		pnlStatusLog.add(new JScrollPane(taLog), BorderLayout.CENTER);
		
		this.setLayout(new BorderLayout());
		this.add(pnlRouterParams, BorderLayout.CENTER);
		this.setBorder(new EmptyBorder(10,10,10,10));
	}

// ## Handler start
	protected class ButtonsHandler implements ActionListener {
		public void actionPerformed(ActionEvent actEvent) {
			String actionCommand = actEvent.getActionCommand();
			
			String routerHost = tfRouterHost.getText();
			boolean useHttps = cbProtocol.getSelectedItem().toString().toLowerCase().equals("https");
			String routerLogin = tfRouterLogin.getText();
			String routerPass = new String(tfRouterPass.getPassword());
			
			if(ACT_SAVE.equals(actionCommand)) {
				RouterResetUtil.this.configureNet(routerHost, useHttps, routerLogin, routerPass);
				if(RouterResetUtil.this.testRouterLogin()) RouterResetUtil.this.doSaveParams();
				else JOptionPane.showMessageDialog(RouterResetUtil.this, "Connection error", "Error", JOptionPane.ERROR_MESSAGE);
			} else if(ACT_TEST.equals(actionCommand)) {
				RouterResetUtil.this.configureNet(routerHost, useHttps, routerLogin, routerPass);
				if(RouterResetUtil.this.testRouterLogin()) JOptionPane.showMessageDialog(RouterResetUtil.this, "Router connection OK", "Message", JOptionPane.INFORMATION_MESSAGE);
				else JOptionPane.showMessageDialog(RouterResetUtil.this, "Connection error", "Error", JOptionPane.ERROR_MESSAGE);
			}
		}
	}
	
	Thread monitorThread = null;
	protected void doSaveParams() {
		this.removeAll();
		this.add(pnlStatusLog, BorderLayout.CENTER);
		this.invalidate();
		this.revalidate();
		if(monitorThread!=null) {
			try {
				monitorThread.interrupt();
				doStartMonitor();
			} catch (Throwable t) {
				error(t);
			}
		} else {
			doStartMonitor();
		}
		 
	}
	
	protected void doStartMonitor() {
		monitorThread = new Thread(new MonitorResetter());
		monitorThread.setDaemon(true);
		monitorThread.start();			
		this.setStatus("Monitoring started");
		this.logInfoMsg("Monitoring started");				
	}
	// ## Handler end
	
	protected void setStatus(final String status) {
		SwingUtilities.invokeLater(new Runnable() {
			public void run() {
				tfStatus.setText("["+dateFormat.format(new Date())+"]: "+status);
			}
		});
	}
	
	protected void logInfoMsg(final String message) {
		SwingUtilities.invokeLater(new Runnable() {
			public void run() {
				taLog.append("["+dateFormat.format(new Date())+"]: "+message+"\n");
			}
		});
	}	
	// ## GUI end

// ## Netz start
	protected void initSsl() {
		try {
			
			SSLContext context = SSLContext.getInstance("TLS");
			context.init(null, new TrustManager[] {new AllowAllTrustManager()}, new SecureRandom());
			/*
			javax.net.ssl.HttpsURLConnection.setDefaultSSLSocketFactory(context.getSocketFactory());
			context = SSLContext.getInstance("SSL");
			context.init(null, new TrustManager[] {new AllowAllTrustManager()}, new SecureRandom());
			javax.net.ssl.HttpsURLConnection.setDefaultSSLSocketFactory(context.getSocketFactory());
			*/
			Protocol myhttps = new Protocol("https", new ProtocolSocketFactory() {
				SSLSocketFactory socketFactory;
				
				public ProtocolSocketFactory setSocketFactory(SSLSocketFactory socketFactory) {
					this.socketFactory = socketFactory; 
					return this;
				}

public Socket createSocket(String host, int port) throws IOException, UnknownHostException {
					return socketFactory.createSocket(host, port);
				}

public Socket createSocket(String host, int port, InetAddress localAddress, int localPort) throws IOException, UnknownHostException {
					return socketFactory.createSocket(host, port, localAddress, localPort);
				}
				public Socket createSocket(String host, int port, InetAddress localAddress, int localPort, HttpConnectionParams params) throws IOException, UnknownHostException,
						ConnectTimeoutException {
					return socketFactory.createSocket(host, port, localAddress, localPort);
				}
			}.setSocketFactory(context.getSocketFactory()), 443);
			Protocol.registerProtocol("https", myhttps);
		}catch(Throwable t) {
			t.printStackTrace();
		}		
	}
	
	protected HttpClient httpClient;
	protected GetMethod getGoogle = new GetMethod("http://www.google.com");
	protected GetMethod getRouterStartPage = new GetMethod();
	protected PostMethod postRouterDHCPRenew = new PostMethod();
	
	protected void initHttpClient() {
		MultiThreadedHttpConnectionManager connectionManager = new MultiThreadedHttpConnectionManager();
		httpClient = new HttpClient(connectionManager);
		httpClient.getParams().setConnectionManagerTimeout(12000L);
		httpClient.getParams().setSoTimeout(12000);
				
		postRouterDHCPRenew.addParameter("submit_type", "renew");
		postRouterDHCPRenew.addParameter("submit_button", "Status_Router");
		postRouterDHCPRenew.addParameter("change_action", "gozila_cgi");
		postRouterDHCPRenew.addParameter("dhcp_renew", "DHCP Renew");		
	}
	
	protected void initNet() {
		initSsl();
		initHttpClient();
	}
	
	protected void configureNet(String routerHost, boolean useHttps, String login, String pass) {
		Credentials credentials = new UsernamePasswordCredentials(login, pass);
		httpClient.getState().clearCredentials();
		httpClient.getState().setCredentials(new AuthScope(routerHost, AuthScope.ANY_PORT), credentials);
		//httpClient.getState().setCredentials(AuthScope.ANY, credentials);
		try {
			getRouterStartPage.setURI(new URI((useHttps? "https://" : "http://") + routerHost+"/index.asp", true));
			postRouterDHCPRenew.setURI(new URI((useHttps? "https://" : "http://") + routerHost+"/apply.cgi", true));
		} catch (Exception e) {
			error(e);
		}
	}
	
	protected boolean testRouterLogin() {
		boolean result = false;
		try {
			log("Trying Router login");
			int rspCode = httpClient.executeMethod(getRouterStartPage);
			System.out.println(getRouterStartPage.getURI());
			if(rspCode>=200 && rspCode<300) {
				result = true;
				log("Router login seems successfull. Code: "+rspCode);
			} else {
				log("Router login seems not OK. Code: "+rspCode+".\nResponse:\n"+getRouterStartPage.getResponseBodyAsString());
			}
		} catch (Throwable t) {
			error(t);
			log("!! Error loggin in to Router - "+t.getClass().getName()+": "+t.getMessage());
		} finally {
			getRouterStartPage.releaseConnection();
        }
		return result;
	}
	
	protected boolean testInetConnection() {
		boolean connected = false;			
		try {
			log("Testing Inet connection");
			int responseCode = httpClient.executeMethod(getGoogle);
			byte[] responseBytes = getGoogle.getResponseBody();
			String responseText = new String(responseBytes, getGoogle.getResponseCharSet());

if(responseCode<200 || responseCode>=300 || responseText.indexOf("<title>Google</title>")<0) {
				if(responseCode<200 || responseCode>=300) {
					log("Wrong response code from google.com");
				} else {
					log("Suspicious response text from google.com");
				}
				log("Response code: "+responseCode+"\nResponse text:"+responseText);
			}
			connected = true;
			log("Inet connection OK");
		} catch(UnknownHostException unknownHostException) {
			connected = false; // Superficial. Well, whatever...
			unknownHostException.printStackTrace();
			log("Unknown host exception for www.google.com - obvious DNS failure");
			log(unknownHostException.getClass().getName()+": "+unknownHostException.getMessage());
		} catch(Throwable err) {
			err.printStackTrace();
			log("Error on testing Inet connection: "+err.getMessage());
			log(err.getClass().getName()+": "+err.getMessage());
		}  finally {
			getGoogle.releaseConnection();
        }
		return connected;		
	}
	
	private boolean resetInternetConnection() {
		boolean done = false;
		try {
			log("Resetting Inet connection");
			
			if(!testRouterLogin()) log("Warning - router login error!");
			
			int responseCode = httpClient.executeMethod(postRouterDHCPRenew);
			byte[] responseBytes = postRouterDHCPRenew.getResponseBody();
			String responseText = new String(responseBytes, postRouterDHCPRenew.getResponseCharSet());
			if(responseCode<200 || responseCode>=300 || responseText.indexOf(">0.0.0.0<")>=0) {
				if(responseCode<200 || responseCode>=300) {
					log("Wrong response code from Router");
				} else {
					log("Zero IPs in response text from Router");
				}
				log("Router response code: "+responseCode+"\nRouter response text:"+responseText);
				log("Resetting Inet connection unsuccessfull");
			} else {
				done = true;	
				log("Resetting Inet connection seems successfull");
			}
		} catch (Throwable err) {
			err.printStackTrace();
			log("Error on resetting Inet connection: "+err.getMessage());
			log(err.getClass().getName()+": "+err.getMessage());			
		} finally {
			postRouterDHCPRenew.releaseConnection();
		}
		return done;
	}	
	// ## Netz end	
	
	protected enum TheCode { GREEN, YELLOW, RED};
	protected class MonitorResetter implements Runnable {

protected TheCode code = TheCode.GREEN;
		
		public void run() {
			while(true) {
				if(!RouterResetUtil.this.testInetConnection()) {
					log("!! Internet connection failure suspected");
					setStatus("YELLOW: Connection failure suspected");
					if(code.equals(TheCode.GREEN)) {
						code = TheCode.YELLOW;
						log("!! Code YELLOW");
					} else if(code.equals(TheCode.YELLOW)) {
						code = TheCode.RED;
						log("!! Code RED");
						log("!! Internet connection failure detected");
						setStatus("RED: Connection failure detected!");
						logInfoMsg("Connection failure detected");
					}
					
					if(code.equals(TheCode.RED)) {
						log("!! Resetting Inet connection");
						if(resetInternetConnection()) {
							code = TheCode.YELLOW;
							log("!! Connection reset\nCode YELLOW");
							setStatus("YELLOW: Connection reset");
							logInfoMsg("Connection reset attempt");
						} else {
							log("!! Failed to reset connection\nCode RED");
							setStatus("RED: Failed to reset connection!!!");
							logInfoMsg("Failed to reset connection!");
						}
					}
				} else {
					if(!code.equals(TheCode.GREEN)) {
						if(code.equals(TheCode.RED)) {
							code = TheCode.YELLOW; 
							log("!! Internet connection seems OK now by itself\nCode YELLOW");
							setStatus("YELLOW: Connection seems OK by itself");
						} else {
							code = TheCode.GREEN;
							log("!! Internet connection is OK\nCode GREEN");
							setStatus("GREEN: Connection is now OK");
							logInfoMsg("Connection is now OK");
						}
					} else {
						log("Connection Ok");
						setStatus("GREEN: Connection is OK");
					}
				}

try {
					if(code.equals(TheCode.GREEN))
						Thread.sleep(WAIT_TIME);
					else 
						Thread.sleep(WAIT_TIME/4);
				} catch (InterruptedException e) {
					log("!! We've been interrupted");
					log("InterruptedException");
					break;
				} catch (Exception e) {
					log("!! Thread insomnia");
					log(e.getClass().getName()+": "+e.getMessage());
					break;						
				}
			}
		}
		
	}
	
	public static class AllowAllTrustManager implements javax.net.ssl.TrustManager, javax.net.ssl.X509TrustManager {
		public java.security.cert.X509Certificate[] getAcceptedIssuers() {
			return null;
		}

public boolean isServerTrusted(java.security.cert.X509Certificate[] certs) {
			return true;
		}

public boolean isClientTrusted(java.security.cert.X509Certificate[] certs) {
			return true;
		}

public void checkServerTrusted(java.security.cert.X509Certificate[] certs, String authType) throws java.security.cert.CertificateException {
			return;
		}

public void checkClientTrusted(java.security.cert.X509Certificate[] certs, String authType) throws java.security.cert.CertificateException {
			return;
		}
	}	
	
}

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