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annotate src/main/java/com/glavsoft/rfb/protocol/state/HandshakeState.java @ 52:472a9bcacb21 draft default tip

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TightVNC 2.7.1.0
author you@cr.ie.u-ryukyu.ac.jp
date Wed, 07 Aug 2013 19:01:17 +0900
parents 4689cc86d6cb
children
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52
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1 // Copyright (C) 2010, 2011, 2012, 2013 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.logging.Logger;
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32 import java.util.regex.Matcher;
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33 import java.util.regex.Pattern;
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34
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35 public class HandshakeState extends ProtocolState {
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36
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37 public static final String PROTOCOL_VERSION_3_8 = "3.8";
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38 public static final String PROTOCOL_VERSION_3_7 = "3.7";
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39 public static final String PROTOCOL_VERSION_3_3 = "3.3";
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40 private static final int PROTOCOL_STRING_LENGTH = 12;
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41 private static final String PROTOCOL_STRING_REGEXP = "^RFB (\\d\\d\\d).(\\d\\d\\d)\n$";
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42
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43 private static final int MIN_SUPPORTED_VERSION_MAJOR = 3;
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44 private static final int MIN_SUPPORTED_VERSION_MINOR = 3;
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45
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46 private static final int MAX_SUPPORTED_VERSION_MAJOR = 3;
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47 private static final int MAX_SUPPORTED_VERSION_MINOR = 8;
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48
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49 public HandshakeState(ProtocolContext context) {
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50 super(context);
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51 }
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53 @Override
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54 public boolean next() throws UnsupportedProtocolVersionException, TransportException {
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55 handshake();
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56 return true;
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57 }
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58
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59 private void handshake() throws TransportException, UnsupportedProtocolVersionException {
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60 String protocolString = reader.readString(PROTOCOL_STRING_LENGTH);
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61 Logger.getLogger(getClass().getName()).info("Server sent protocol string: " + protocolString.substring(0, protocolString.length() - 1));
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62 Pattern pattern = Pattern.compile(PROTOCOL_STRING_REGEXP);
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63 final Matcher matcher = pattern.matcher(protocolString);
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64 if ( ! matcher.matches())
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65 throw new UnsupportedProtocolVersionException(
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66 "Unsupported protocol version: " + protocolString);
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67 int major = Integer.parseInt(matcher.group(1));
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68 int minor = Integer.parseInt(matcher.group(2));
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69 if (major < MIN_SUPPORTED_VERSION_MAJOR ||
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70 MIN_SUPPORTED_VERSION_MAJOR == major && minor <MIN_SUPPORTED_VERSION_MINOR)
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71 throw new UnsupportedProtocolVersionException(
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72 "Unsupported protocol version: " + major + "." + minor);
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73 if (major > MAX_SUPPORTED_VERSION_MAJOR) {
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74 major = MAX_SUPPORTED_VERSION_MAJOR;
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75 minor = MAX_SUPPORTED_VERSION_MINOR;
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76 }
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77
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78 if (minor >= MIN_SUPPORTED_VERSION_MINOR && minor < 7) {
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79 changeStateTo(new SecurityType33State(context));
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80 context.setProtocolVersion(PROTOCOL_VERSION_3_3);
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81 minor = 3;
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82 } else if (7 == minor) {
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83 changeStateTo(new SecurityType37State(context));
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84 context.setProtocolVersion(PROTOCOL_VERSION_3_7);
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85 minor = 7;
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86 } else if (minor >= MAX_SUPPORTED_VERSION_MINOR) {
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87 changeStateTo(new SecurityTypeState(context));
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88 context.setProtocolVersion(PROTOCOL_VERSION_3_8);
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89 minor = 8;
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90 } else
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91 throw new UnsupportedProtocolVersionException(
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92 "Unsupported protocol version: " + protocolString);
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93 writer.write(("RFB 00" + major + ".00" + minor + "\n").getBytes());
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94 Logger.getLogger(getClass().getName()).info("Set protocol version to: " + context.getProtocolVersion());
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95 }
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96
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97 }