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1 /* |
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2 * Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies). |
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3 * All rights reserved. |
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4 * This component and the accompanying materials are made available |
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5 * under the terms of "Eclipse Public License v1.0" |
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6 * which accompanies this distribution, and is available |
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7 * at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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8 * |
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9 * Initial Contributors: |
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10 * Nokia Corporation - initial contribution. |
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11 * |
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12 * Contributors: |
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13 * |
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14 * Description: IPProxy UDP protocol expression for a regular UDP message |
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15 * connection. |
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16 * |
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17 */ |
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18 |
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19 |
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20 |
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21 // INCLUDE FILES |
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22 #include "CExprUDPMsg.h" |
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23 #include "CommRouterDefinitions.h" |
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24 #include "MExpressionObserver.h" |
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25 |
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26 #define DEBUG_FILENAME "IPProxyEngine.log" |
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27 #include "DebugPrint.h" |
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28 |
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29 |
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30 // ============================ MEMBER FUNCTIONS =============================== |
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31 |
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32 // ----------------------------------------------------------------------------- |
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33 // CExprUDPMsg::CExprUDPMsg |
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34 // ----------------------------------------------------------------------------- |
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35 // |
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36 CExprUDPMsg::CExprUDPMsg( MExpressionObserver* aObserver ) |
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37 : iObserver( aObserver ) |
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38 { |
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39 __ASSERT_DEBUG( iObserver, User::Invariant() ); |
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40 } |
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41 |
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42 // ----------------------------------------------------------------------------- |
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43 // CExprUDPMsg::NewL |
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44 // ----------------------------------------------------------------------------- |
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45 // |
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46 CExprUDPMsg* CExprUDPMsg::NewL( MExpressionObserver* aObserver ) |
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47 { |
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48 CExprUDPMsg* self = CExprUDPMsg::NewLC( aObserver ); |
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49 CleanupStack::Pop(); |
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50 |
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51 return self; |
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52 } |
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53 |
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54 // ----------------------------------------------------------------------------- |
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55 // CExprUDPMsg::NewLC |
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56 // ----------------------------------------------------------------------------- |
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57 // |
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58 CExprUDPMsg* CExprUDPMsg::NewLC( MExpressionObserver* aObserver ) |
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59 { |
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60 CExprUDPMsg* self = new( ELeave ) CExprUDPMsg( aObserver ); |
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61 CleanupStack::PushL( self ); |
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62 |
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63 return self; |
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64 } |
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65 |
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66 |
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67 // Destructor |
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68 CExprUDPMsg::~CExprUDPMsg() |
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69 { |
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70 } |
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71 |
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72 |
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73 // ----------------------------------------------------------------------------- |
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74 // CExprUDPMsg::HandleReceivedDataL() |
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75 // ----------------------------------------------------------------------------- |
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76 // |
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77 TBool CExprUDPMsg::HandleRecievedMsgL( TDes8& aData, TInt& aStartPos, TInt& aLength ) |
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78 { |
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79 // Check if the prefix matches |
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80 aStartPos = aData.Find( KUDPPrefix ); |
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81 |
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82 if ( aStartPos != KErrNotFound ) |
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83 { |
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84 // Found a matching prefix |
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85 // Let the observer know |
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86 iObserver->FrameStarted(); |
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87 |
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88 TPtr8 dataToParse( aData.MidTPtr( aStartPos ) ); |
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89 |
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90 TInt err = TryParsingL( dataToParse, aLength ); |
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91 |
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92 if ( err != KErrNone ) |
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93 { |
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94 // corrupted data in the frame |
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95 iObserver->ProtocolErrorL( err, aData ); |
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96 // delete the corrupted data |
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97 aData.SetLength( 0 ); |
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98 } |
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99 |
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100 return ETrue; |
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101 } |
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102 else |
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103 { |
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104 return EFalse; |
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105 } |
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106 |
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107 } |
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108 |
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109 // ----------------------------------------------------------------------------- |
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110 // CExprUDPMsg::TryParsingL |
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111 // ----------------------------------------------------------------------------- |
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112 // |
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113 TInt CExprUDPMsg::TryParsingL( TDes8& aData, TInt& aLength ) |
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114 { |
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115 __ASSERT_ALWAYS( aData.Left( KUDPPrefix().Length() ) == KUDPPrefix, |
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116 User::Panic( _L("Protocol"), 1 ) ); |
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117 |
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118 // UDP:0123,000e,[Some test data] |
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119 TInt frameOverhead = |
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120 KUDPPrefix().Length() + |
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121 KHexDecimalLength + |
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122 KPortSuffix().Length() + |
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123 KHexDecimalLength + |
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124 KLengthSuffix().Length() + |
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125 KDataSuffix().Length() + |
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126 KMessageSuffix().Length(); |
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127 |
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128 if ( aData.Length() >= frameOverhead ) |
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129 { |
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130 TPtrC8 portPtr( |
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131 aData.Mid( KUDPPrefix().Length(), KHexDecimalLength ) ); |
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132 |
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133 TLex8 portLexer( portPtr ); |
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134 TUint port; |
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135 if ( portLexer.Val( port, EHex ) != KErrNone ) |
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136 { |
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137 return KErrCorrupt; |
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138 } |
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139 DEBUG_PRINT( DEBUG_STRING( "CExprUDPMsg::TryParsingL, port = %d" ), port ); |
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140 |
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141 //Check port suffix |
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142 if ( aData.Mid( KUDPPrefix().Length() + |
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143 KHexDecimalLength, KPortSuffix().Length() ) != KPortSuffix ) |
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144 { |
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145 return KErrCorrupt; |
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146 } |
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147 |
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148 TPtrC8 lengthPtr( aData.Mid( KUDPPrefix().Length() + |
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149 KHexDecimalLength + KPortSuffix().Length(), KHexDecimalLength ) ); |
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150 TLex8 lengthLexer( lengthPtr ); |
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151 TUint length; |
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152 if ( lengthLexer.Val( length, EHex ) != KErrNone ) |
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153 { |
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154 return KErrCorrupt; |
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155 } |
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156 DEBUG_PRINT( DEBUG_STRING( "CExprUDPMsg::TryParsingL, length = %d" ), length ); |
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157 |
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158 //Check length suffix |
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159 if ( aData.Mid( |
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160 KUDPPrefix().Length() + |
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161 KHexDecimalLength + |
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162 KPortSuffix().Length() + |
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163 KHexDecimalLength, KLengthSuffix().Length() ) != KLengthSuffix ) |
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164 { |
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165 return KErrCorrupt; |
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166 } |
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167 |
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168 DEBUG_PRINT( DEBUG_STRING( "CExprUDPMsg::TryParsingL, parsing data" ), length ); |
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169 |
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170 if ( aData.Length() >= TInt( frameOverhead + length ) ) |
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171 { |
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172 TInt messagePos = KUDPPrefix().Length() + |
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173 KHexDecimalLength + |
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174 KPortSuffix().Length() + |
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175 KHexDecimalLength + |
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176 KLengthSuffix().Length(); |
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177 |
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178 TPtrC8 message( aData.Mid( messagePos, length ) ); |
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179 if ( aData.Mid( messagePos + length, |
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180 KDataSuffix().Length() ) != KDataSuffix ) |
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181 { |
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182 return KErrCorrupt; |
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183 } |
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184 DEBUG_PRINT( DEBUG_STRING( "CExprUDPMsg::TryParsingL, message OK" ) ); |
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185 |
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186 if ( aData.Mid( messagePos + length + KDataSuffix().Length(), |
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187 KMessageSuffix().Length() ) != KMessageSuffix ) |
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188 { |
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189 return KErrCorrupt; |
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190 } |
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191 |
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192 // send parsed results |
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193 iObserver->FrameParsedL( port, message ); |
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194 // set the length of the handled message |
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195 aLength = frameOverhead + length; |
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196 |
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197 return KErrNone; |
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198 } |
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199 |
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200 } |
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201 return KErrNone; |
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202 } |
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203 |
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204 // End of File |