Mercurial > hg > Applications > TightVNC_orginal
annotate src/main/java/com/glavsoft/rfb/protocol/state/HandshakeState.java @ 0:4689cc86d6cb
create TreeViewer2 Repository
author | Yu Taninari <you@cr.ie.u-ryukyu.ac.jp> |
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date | Tue, 03 Jul 2012 13:20:49 +0900 |
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children | e7ce2b2ffed8 472a9bcacb21 |
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1 // Copyright (C) 2010, 2011 GlavSoft LLC. |
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2 // All rights reserved. |
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3 // |
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4 //------------------------------------------------------------------------- |
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5 // This file is part of the TightVNC software. Please visit our Web site: |
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6 // |
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7 // http://www.tightvnc.com/ |
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8 // |
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9 // This program is free software; you can redistribute it and/or modify |
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10 // it under the terms of the GNU General Public License as published by |
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11 // the Free Software Foundation; either version 2 of the License, or |
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12 // (at your option) any later version. |
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13 // |
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14 // This program is distributed in the hope that it will be useful, |
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15 // but WITHOUT ANY WARRANTY; without even the implied warranty of |
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16 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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17 // GNU General Public License for more details. |
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18 // |
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19 // You should have received a copy of the GNU General Public License along |
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20 // with this program; if not, write to the Free Software Foundation, Inc., |
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21 // 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
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22 //------------------------------------------------------------------------- |
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23 // |
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24 |
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25 package com.glavsoft.rfb.protocol.state; |
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26 |
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27 import com.glavsoft.exceptions.TransportException; |
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28 import com.glavsoft.exceptions.UnsupportedProtocolVersionException; |
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29 import com.glavsoft.rfb.protocol.ProtocolContext; |
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30 |
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31 import java.util.regex.Matcher; |
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32 import java.util.regex.Pattern; |
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33 |
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34 public class HandshakeState extends ProtocolState { |
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35 |
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36 public static final String PROTOCOL_VERSION_3_8 = "3.8"; |
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37 public static final String PROTOCOL_VERSION_3_7 = "3.7"; |
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38 public static final String PROTOCOL_VERSION_3_3 = "3.3"; |
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39 private static final int PROTOCOL_STRING_LENGTH = 12; |
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40 private static final String PROTOCOL_STRING_REGEXP = "^RFB (\\d\\d\\d).(\\d\\d\\d)\n$"; |
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41 |
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42 private static final int MIN_SUPPORTED_VERSION_MAJOR = 3; |
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43 private static final int MIN_SUPPORTED_VERSION_MINOR = 3; |
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44 |
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45 private static final int MAX_SUPPORTED_VERSION_MAJOR = 3; |
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46 private static final int MAX_SUPPORTED_VERSION_MINOR = 8; |
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47 |
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48 public HandshakeState(ProtocolContext context) { |
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49 super(context); |
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50 } |
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51 |
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52 @Override |
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53 public boolean next() throws UnsupportedProtocolVersionException, TransportException { |
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54 handshake(); |
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55 return true; |
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56 } |
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57 |
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58 private void handshake() throws TransportException, UnsupportedProtocolVersionException { |
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59 String protocolString = reader.readString(PROTOCOL_STRING_LENGTH); |
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60 logger.info("Server sent protocol string: " + protocolString.substring(0, protocolString.length() - 1)); |
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61 Pattern pattern = Pattern.compile(PROTOCOL_STRING_REGEXP); |
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62 final Matcher matcher = pattern.matcher(protocolString); |
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63 if ( ! matcher.matches()) |
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64 throw new UnsupportedProtocolVersionException( |
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65 "Unsupported protocol version: " + protocolString); |
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66 int major = Integer.parseInt(matcher.group(1)); |
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67 int minor = Integer.parseInt(matcher.group(2)); |
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68 if (major < MIN_SUPPORTED_VERSION_MAJOR || |
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69 MIN_SUPPORTED_VERSION_MAJOR == major && minor <MIN_SUPPORTED_VERSION_MINOR) |
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70 throw new UnsupportedProtocolVersionException( |
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71 "Unsupported protocol version: " + major + "." + minor); |
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72 if (major > MAX_SUPPORTED_VERSION_MAJOR) { |
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73 major = MAX_SUPPORTED_VERSION_MAJOR; |
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74 minor = MAX_SUPPORTED_VERSION_MINOR; |
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75 } |
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76 |
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77 if (minor >= MIN_SUPPORTED_VERSION_MINOR && minor < 7) { |
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78 changeStateTo(new SecurityType33State(context)); |
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79 context.getSettings().setProtocolVersion(PROTOCOL_VERSION_3_3); |
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80 minor = 3; |
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81 } else if (7 == minor) { |
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82 changeStateTo(new SecurityType37State(context)); |
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83 context.getSettings().setProtocolVersion(PROTOCOL_VERSION_3_7); |
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84 minor = 7; |
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85 } else if (minor >= MAX_SUPPORTED_VERSION_MINOR) { |
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86 changeStateTo(new SecurityTypeState(context)); |
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87 context.getSettings().setProtocolVersion(PROTOCOL_VERSION_3_8); |
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88 minor = 8; |
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89 } else |
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90 throw new UnsupportedProtocolVersionException( |
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91 "Unsupported protocol version: " + protocolString); |
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92 writer.write(("RFB 00" + major + ".00" + minor + "\n").getBytes()); |
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93 logger.info("Set protocol version to: " + context.getSettings().getProtocolVersion()); |
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94 } |
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95 |
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96 } |