package de.pixart.messenger.xmpp.jingle; import android.os.PowerManager; import android.util.Log; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import java.net.InetAddress; import java.net.InetSocketAddress; import java.net.ServerSocket; import java.net.Socket; import java.net.SocketAddress; import java.nio.ByteBuffer; import java.security.MessageDigest; import java.security.NoSuchAlgorithmException; import de.pixart.messenger.Config; import de.pixart.messenger.entities.Account; import de.pixart.messenger.entities.DownloadableFile; import de.pixart.messenger.persistance.FileBackend; import de.pixart.messenger.services.AbstractConnectionManager; import de.pixart.messenger.utils.CryptoHelper; import de.pixart.messenger.utils.SocksSocketFactory; import de.pixart.messenger.utils.WakeLockHelper; import de.pixart.messenger.xmpp.jingle.stanzas.Content; public class JingleSocks5Transport extends JingleTransport { private static final int SOCKET_TIMEOUT_DIRECT = 3000; private static final int SOCKET_TIMEOUT_PROXY = 5000; private final JingleCandidate candidate; private final JingleConnection connection; private final String destination; private OutputStream outputStream; private InputStream inputStream; private boolean isEstablished = false; private boolean activated = false; private ServerSocket serverSocket; private Socket socket; JingleSocks5Transport(JingleConnection jingleConnection, JingleCandidate candidate) { final MessageDigest messageDigest; try { messageDigest = MessageDigest.getInstance("SHA-1"); } catch (NoSuchAlgorithmException e) { throw new AssertionError(e); } this.candidate = candidate; this.connection = jingleConnection; final StringBuilder destBuilder = new StringBuilder(); if (jingleConnection.getFtVersion() == Content.Version.FT_3) { Log.d(Config.LOGTAG, this.connection.getAccount().getJid().asBareJid() + ": using session Id instead of transport Id for proxy destination"); destBuilder.append(jingleConnection.getSessionId()); } else { destBuilder.append(jingleConnection.getTransportId()); } if (candidate.isOurs()) { destBuilder.append(jingleConnection.getAccount().getJid()); destBuilder.append(jingleConnection.getCounterPart()); } else { destBuilder.append(jingleConnection.getCounterPart()); destBuilder.append(jingleConnection.getAccount().getJid()); } messageDigest.reset(); this.destination = CryptoHelper.bytesToHex(messageDigest.digest(destBuilder.toString().getBytes())); if (candidate.isOurs() && candidate.getType() == JingleCandidate.TYPE_DIRECT) { createServerSocket(); } } private void createServerSocket() { try { serverSocket = new ServerSocket(); serverSocket.bind(new InetSocketAddress(InetAddress.getByName(candidate.getHost()), candidate.getPort())); new Thread(() -> { try { final Socket socket = serverSocket.accept(); new Thread(() -> { try { acceptIncomingSocketConnection(socket); } catch (IOException e) { Log.d(Config.LOGTAG, "unable to read from socket", e); } }).start(); } catch (IOException e) { if (!serverSocket.isClosed()) { Log.d(Config.LOGTAG, "unable to accept socket", e); } } }).start(); } catch (IOException e) { Log.d(Config.LOGTAG, "unable to bind server socket ", e); } } private void acceptIncomingSocketConnection(final Socket socket) throws IOException { Log.d(Config.LOGTAG, "accepted connection from " + socket.getInetAddress().getHostAddress()); socket.setSoTimeout(SOCKET_TIMEOUT_DIRECT); final byte[] authBegin = new byte[2]; final InputStream inputStream = socket.getInputStream(); final OutputStream outputStream = socket.getOutputStream(); inputStream.read(authBegin); if (authBegin[0] != 0x5) { socket.close(); } final short methodCount = authBegin[1]; final byte[] methods = new byte[methodCount]; inputStream.read(methods); if (SocksSocketFactory.contains((byte) 0x00, methods)) { outputStream.write(new byte[]{0x05, 0x00}); } else { outputStream.write(new byte[]{0x05, (byte) 0xff}); } byte[] connectCommand = new byte[4]; inputStream.read(connectCommand); if (connectCommand[0] == 0x05 && connectCommand[1] == 0x01 && connectCommand[3] == 0x03) { int destinationCount = inputStream.read(); final byte[] destination = new byte[destinationCount]; inputStream.read(destination); final byte[] port = new byte[2]; inputStream.read(port); final String receivedDestination = new String(destination); final ByteBuffer response = ByteBuffer.allocate(7 + destination.length); final byte[] responseHeader; final boolean success; if (receivedDestination.equals(this.destination) && this.socket == null) { responseHeader = new byte[]{0x05, 0x00, 0x00, 0x03}; success = true; } else { Log.d(Config.LOGTAG, connection.getAccount().getJid().asBareJid() + ": destination mismatch. received " + receivedDestination + " (expected " + this.destination + ")"); responseHeader = new byte[]{0x05, 0x04, 0x00, 0x03}; success = false; } response.put(responseHeader); response.put((byte) destination.length); response.put(destination); response.put(port); outputStream.write(response.array()); outputStream.flush(); if (success) { Log.d(Config.LOGTAG, connection.getAccount().getJid().asBareJid() + ": successfully processed connection to candidate " + candidate.getHost() + ":" + candidate.getPort()); socket.setSoTimeout(0); this.socket = socket; this.inputStream = inputStream; this.outputStream = outputStream; this.isEstablished = true; FileBackend.close(serverSocket); } else { FileBackend.close(socket); } } else { socket.close(); } } public void connect(final OnTransportConnected callback) { new Thread(() -> { final int timeout = candidate.getType() == JingleCandidate.TYPE_DIRECT ? SOCKET_TIMEOUT_DIRECT : SOCKET_TIMEOUT_PROXY; try { final boolean useTor = connection.getAccount().isOnion() || connection.getConnectionManager().getXmppConnectionService().useTorToConnect(); if (useTor) { socket = SocksSocketFactory.createSocketOverTor(candidate.getHost(), candidate.getPort()); } else { socket = new Socket(); SocketAddress address = new InetSocketAddress(candidate.getHost(), candidate.getPort()); socket.connect(address, timeout); } inputStream = socket.getInputStream(); outputStream = socket.getOutputStream(); socket.setSoTimeout(timeout); SocksSocketFactory.createSocksConnection(socket, destination, 0); socket.setSoTimeout(0); isEstablished = true; callback.established(); } catch (IOException e) { callback.failed(); } }).start(); } public void send(final DownloadableFile file, final OnFileTransmissionStatusChanged callback) { new Thread(() -> { InputStream fileInputStream = null; final PowerManager.WakeLock wakeLock = connection.getConnectionManager().createWakeLock("jingle_send_" + connection.getSessionId()); long transmitted = 0; try { wakeLock.acquire(); MessageDigest digest = MessageDigest.getInstance("SHA-1"); digest.reset(); fileInputStream = connection.getFileInputStream(); if (fileInputStream == null) { Log.d(Config.LOGTAG, connection.getAccount().getJid().asBareJid() + ": could not create input stream"); callback.onFileTransferAborted(); return; } final InputStream innerInputStream = AbstractConnectionManager.upgrade(file, fileInputStream); long size = file.getExpectedSize(); int count; byte[] buffer = new byte[8192]; while ((count = innerInputStream.read(buffer)) > 0) { outputStream.write(buffer, 0, count); digest.update(buffer, 0, count); transmitted += count; connection.updateProgress((int) ((((double) transmitted) / size) * 100)); } outputStream.flush(); file.setSha1Sum(digest.digest()); if (callback != null) { callback.onFileTransmitted(file); } } catch (Exception e) { final Account account = connection.getAccount(); Log.d(Config.LOGTAG, account.getJid().asBareJid() + ": failed sending file after " + transmitted + "/" + file.getExpectedSize() + " (" + socket.getInetAddress() + ":" + socket.getPort() + ")", e); callback.onFileTransferAborted(); } finally { FileBackend.close(fileInputStream); WakeLockHelper.release(wakeLock); } }).start(); } public void receive(final DownloadableFile file, final OnFileTransmissionStatusChanged callback) { new Thread(() -> { OutputStream fileOutputStream = null; final PowerManager.WakeLock wakeLock = connection.getConnectionManager().createWakeLock("jingle_receive_" + connection.getSessionId()); try { wakeLock.acquire(); MessageDigest digest = MessageDigest.getInstance("SHA-1"); digest.reset(); //inputStream.skip(45); socket.setSoTimeout(30000); fileOutputStream = connection.getFileOutputStream(); if (fileOutputStream == null) { callback.onFileTransferAborted(); Log.d(Config.LOGTAG, connection.getAccount().getJid().asBareJid() + ": could not create output stream"); return; } double size = file.getExpectedSize(); long remainingSize = file.getExpectedSize(); byte[] buffer = new byte[8192]; int count; while (remainingSize > 0) { count = inputStream.read(buffer); if (count == -1) { callback.onFileTransferAborted(); Log.d(Config.LOGTAG, connection.getAccount().getJid().asBareJid() + ": file ended prematurely with " + remainingSize + " bytes remaining"); return; } else { fileOutputStream.write(buffer, 0, count); digest.update(buffer, 0, count); remainingSize -= count; } connection.updateProgress((int) (((size - remainingSize) / size) * 100)); } fileOutputStream.flush(); fileOutputStream.close(); file.setSha1Sum(digest.digest()); callback.onFileTransmitted(file); } catch (Exception e) { Log.d(Config.LOGTAG, connection.getAccount().getJid().asBareJid() + ": " + e.getMessage()); callback.onFileTransferAborted(); } finally { WakeLockHelper.release(wakeLock); FileBackend.close(fileOutputStream); FileBackend.close(inputStream); } }).start(); } public boolean isProxy() { return this.candidate.getType() == JingleCandidate.TYPE_PROXY; } public boolean needsActivation() { return (this.isProxy() && !this.activated); } public void disconnect() { FileBackend.close(inputStream); FileBackend.close(outputStream); FileBackend.close(socket); FileBackend.close(serverSocket); } public boolean isEstablished() { return this.isEstablished; } public JingleCandidate getCandidate() { return this.candidate; } public void setActivated(boolean activated) { this.activated = activated; } }