src/de/ub0r/android/adBlock/Proxy.java

   1 /**
   2  *
   3  */
   4 package de.ub0r.android.adBlock;
   5
   6 import java.io.BufferedReader;
   7 import java.io.BufferedWriter;
   8 import java.io.IOException;
   9 import java.io.InputStreamReader;
  10 import java.io.OutputStreamWriter;
  11 import java.net.InetSocketAddress;
  12 import java.net.ServerSocket;
  13 import java.net.Socket;
  14
  15 import android.app.Service;
  16 import android.content.Context;
  17 import android.content.Intent;
  18 import android.os.IBinder;
  19 import android.widget.Toast;
  20
  21 /**
  22  * @author flx
  23  */
  24 public class Proxy extends Service implements Runnable {
  25
  26         private Thread proxy = null;
  27         private int port = 8080;
  28         private boolean stop = false;
  29
  30         private class Connection implements Runnable {
  31
  32                 private final Socket local;
  33                 private Socket remote;
  34                 private final Context cont;
  35
  36                 private class CopyStream implements Runnable {
  37                         private final BufferedReader reader;
  38                         private final BufferedWriter writer;
  39                         private final Object sync;
  40
  41                         public CopyStream(final BufferedReader r, final BufferedWriter w,
  42                                         final Object s) {
  43                                 this.reader = r;
  44                                 this.writer = w;
  45                                 this.sync = s;
  46                         }
  47
  48                         @Override
  49                         public void run() {
  50                                 try {
  51                                         String s;
  52                                         do {
  53                                                 s = this.reader.readLine();
  54                                                 if (s == null) {
  55                                                         break;
  56                                                 }
  57                                                 this.writer.append(s + "\n");
  58                                                 this.writer.flush();
  59                                         } while (true);
  60                                         System.out.println("close remote");
  61                                         synchronized (this.sync) {
  62                                                 this.sync.notify();
  63                                         }
  64                                 } catch (IOException e) {
  65                                         // handle exception
  66                                 }
  67                         }
  68                 }
  69
  70                 public Connection(final Socket socket, final Context context) {
  71                         this.local = socket;
  72                         this.cont = context;
  73                 }
  74
  75                 @Override
  76                 public void run() {
  77                         try {
  78                                 BufferedReader localReader = new BufferedReader(
  79                                                 new InputStreamReader(this.local.getInputStream()));
  80                                 BufferedWriter localWriter = new BufferedWriter(
  81                                                 new OutputStreamWriter(this.local.getOutputStream()));
  82                                 BufferedReader remoteReader = null;
  83                                 BufferedWriter remoteWriter = null;
  84                                 StringBuilder buffer = new StringBuilder();
  85                                 String s;
  86                                 while (this.remote == null) {
  87                                         s = localReader.readLine();
  88                                         buffer.append(s + "\n");
  89                                         System.out.println(s);
  90                                         if (s.startsWith("Host:")) {
  91                                                 // init remote socket
  92                                                 int targetPort = 80;
  93                                                 String targetHost = s.substring(6).trim();
  94                                                 int i = targetHost.indexOf(':');
  95                                                 if (i > 0) {
  96                                                         targetPort = Integer.parseInt(targetHost
  97                                                                         .substring(i + 1));
  98                                                         targetHost = targetHost.substring(0, i);
  99                                                 }
 100                                                 System.out.println("connect to " + targetHost + " "
 101                                                                 + targetPort);
 102                                                 this.remote = new Socket();
 103                                                 this.remote.connect(new InetSocketAddress(targetHost,
 104                                                                 targetPort));
 105                                                 remoteReader = new BufferedReader(
 106                                                                 new InputStreamReader(this.remote
 107                                                                                 .getInputStream()));
 108                                                 remoteWriter = new BufferedWriter(
 109                                                                 new OutputStreamWriter(this.remote
 110                                                                                 .getOutputStream()));
 111                                                 remoteWriter.append(buffer);
 112                                                 remoteWriter.flush();
 113                                                 buffer = null;
 114                                         }
 115                                 }
 116                                 if (this.remote != null && this.remote.isConnected()) {
 117                                         Object sync = new Object();
 118
 119                                         Thread t1 = new Thread(new CopyStream(remoteReader,
 120                                                         localWriter, sync));
 121                                         Thread t2 = new Thread(new CopyStream(localReader,
 122                                                         remoteWriter, sync));
 123
 124                                         try {
 125                                                 synchronized (sync) {
 126                                                         t1.start();
 127                                                         t2.start();
 128                                                         sync.wait();
 129                                                 }
 130                                         } catch (InterruptedException e) {
 131                                                 e.printStackTrace();
 132                                         }
 133                                         System.out.println("join");
 134                                         t1.join();
 135                                         t2.join();
 136                                         System.out.println("close local");
 137                                         this.local.close();
 138                                 }
 139                         } catch (InterruptedException e) {
 140                                 // do nothing
 141                         } catch (NullPointerException e) {
 142                                 // do nothing
 143                         } catch (Exception e) {
 144                                 e.printStackTrace();
 145                                 Toast.makeText(this.cont, e.toString(), Toast.LENGTH_LONG)
 146                                                 .show();
 147                         }
 148                 }
 149         }
 150
 151         /*
 152          * (non-Javadoc)
 153          *
 154          * @see android.app.Service#onBind(android.content.Intent)
 155          */
 156         @Override
 157         public IBinder onBind(final Intent intent) {
 158                 return null;
 159         }
 160
 161         @Override
 162         public void onStart(final Intent intent, final int startId) {
 163                 super.onStart(intent, startId);
 164                 if (this.proxy == null) {
 165                         Toast.makeText(this, "starting proxy..", Toast.LENGTH_LONG).show();
 166                         this.proxy = new Thread(this);
 167                         this.proxy.start();
 168                 } else {
 169                         Toast.makeText(this, "proxy running", Toast.LENGTH_LONG).show();
 170                 }
 171         }
 172
 173         @Override
 174         public void onDestroy() {
 175                 super.onDestroy();
 176                 Toast.makeText(this, "stopping proxy..", Toast.LENGTH_LONG).show();
 177                 this.stop = true;
 178         }
 179
 180         @Override
 181         public void run() {
 182                 try {
 183                         ServerSocket sock = new ServerSocket(this.port);
 184                         Socket client;
 185                         while (!this.stop) {
 186                                 client = sock.accept();
 187                                 if (client != null) {
 188                                         Thread t = new Thread(new Connection(client, this));
 189                                         t.start();
 190                                 }
 191                         }
 192                 } catch (IOException e) {
 193                         e.printStackTrace();
 194                         Toast.makeText(this, e.toString(), Toast.LENGTH_LONG).show();
 195                 }
 196         }
 197 }