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1 /* |
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2 * Copyright (c) 2006-2007 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: |
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15 * |
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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 /* |
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22 TCP Relay packet header: |
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23 |
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24 0 1 2 3 |
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25 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 |
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26 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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27 | Relay type | Reserved=0x00 | Data length | |
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28 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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29 |
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30 */ |
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31 |
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32 #include <es_sock.h> |
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33 #include "natfwunsaftcprelaypacket.h" |
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34 #include "natfwunsafutils.h" |
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35 |
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36 // CONSTANTS |
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37 const TInt KByteSize = 8; |
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38 |
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39 // ----------------------------------------------------------------------------- |
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40 // CNATFWUNSAFTcpRelayPacket::NewL |
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41 // ----------------------------------------------------------------------------- |
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42 // |
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43 EXPORT_C CNATFWUNSAFTcpRelayPacket* CNATFWUNSAFTcpRelayPacket::NewL( |
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44 const TDesC8& aData, |
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45 const TRelayType aType) |
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46 { |
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47 CNATFWUNSAFTcpRelayPacket* self = |
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48 CNATFWUNSAFTcpRelayPacket::NewLC(aData, aType); |
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49 CleanupStack::Pop(self); |
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50 return self; |
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51 } |
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52 |
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53 // ----------------------------------------------------------------------------- |
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54 // CNATFWUNSAFTcpRelayPacket::NewLC |
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55 // ----------------------------------------------------------------------------- |
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56 // |
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57 EXPORT_C CNATFWUNSAFTcpRelayPacket* CNATFWUNSAFTcpRelayPacket::NewLC( |
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58 const TDesC8& aData, |
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59 const TRelayType aType) |
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60 { |
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61 CNATFWUNSAFTcpRelayPacket* self = |
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62 new (ELeave) CNATFWUNSAFTcpRelayPacket(); |
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63 CleanupStack::PushL(self); |
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64 self->ConstructL(aData, aType); |
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65 return self; |
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66 } |
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67 |
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68 // ----------------------------------------------------------------------------- |
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69 // CNATFWUNSAFTcpRelayPacket::CreateL |
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70 // ----------------------------------------------------------------------------- |
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71 // |
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72 CNATFWUNSAFTcpRelayPacket* CNATFWUNSAFTcpRelayPacket::CreateL( |
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73 const TDesC8& aData, |
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74 const TRelayType aType ) |
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75 { |
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76 return NewL(aData, aType); |
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77 } |
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78 |
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79 // ----------------------------------------------------------------------------- |
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80 // CNATFWUNSAFTcpRelayPacket::CNATFWUNSAFTcpRelayPacket |
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81 // ----------------------------------------------------------------------------- |
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82 // |
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83 CNATFWUNSAFTcpRelayPacket::CNATFWUNSAFTcpRelayPacket() |
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84 { |
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85 } |
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86 |
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87 // ----------------------------------------------------------------------------- |
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88 // CNATFWUNSAFTcpRelayPacket::~CNATFWUNSAFTcpRelayPacket |
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89 // ----------------------------------------------------------------------------- |
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90 // |
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91 CNATFWUNSAFTcpRelayPacket::~CNATFWUNSAFTcpRelayPacket() |
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92 { |
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93 delete iData; |
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94 } |
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95 |
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96 // ----------------------------------------------------------------------------- |
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97 // CNATFWUNSAFTcpRelayPacket::ConstructL |
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98 // ----------------------------------------------------------------------------- |
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99 // |
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100 void CNATFWUNSAFTcpRelayPacket::ConstructL( |
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101 const TDesC8& aData, |
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102 const TRelayType aType ) |
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103 { |
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104 CheckLengthL(aData.Length()); |
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105 iData = aData.AllocL(); |
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106 iType = aType; |
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107 } |
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108 |
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109 // ----------------------------------------------------------------------------- |
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110 // CNATFWUNSAFTcpRelayPacket::EncodeL |
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111 // ----------------------------------------------------------------------------- |
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112 // |
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113 EXPORT_C CBufBase* CNATFWUNSAFTcpRelayPacket::EncodeL() const |
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114 { |
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115 CBufBase* relay = EncodeRelayHeaderLC(); |
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116 relay->InsertL(relay->Size(), *iData); |
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117 CleanupStack::Pop(relay); |
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118 SetRelayLength(*relay); |
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119 return relay; |
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120 } |
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121 |
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122 // ----------------------------------------------------------------------------- |
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123 // CNATFWUNSAFTcpRelayPacket::EncodeRelayHeaderLC |
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124 // ----------------------------------------------------------------------------- |
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125 // |
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126 CBufBase* CNATFWUNSAFTcpRelayPacket::EncodeRelayHeaderLC() const |
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127 { |
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128 CBufBase* header = CBufFlat::NewL(EFrameSize); |
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129 CleanupStack::PushL(header); |
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130 TUint16 relayType = Type(); |
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131 // Last eight bits of frame type are reserved as zeros |
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132 relayType <<= KByteSize; |
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133 TUint16 bigEndianType(0); |
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134 BigEndian::Put16(reinterpret_cast<TUint8*>(&bigEndianType), relayType); |
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135 header->InsertL(EFrameTypeOffset, &bigEndianType, sizeof(bigEndianType)); |
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136 //Value is zero, so it is same also in the big endian representation |
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137 TUint16 frameLength(0); |
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138 header->InsertL(EFrameLengthOffset, &frameLength, sizeof(frameLength)); |
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139 return header; |
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140 } |
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141 |
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142 // ----------------------------------------------------------------------------- |
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143 // CNATFWUNSAFTcpRelayPacket::RelayLength |
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144 // TInt is guaranteed to be at least 32 bits. |
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145 // ----------------------------------------------------------------------------- |
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146 // |
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147 TInt CNATFWUNSAFTcpRelayPacket::RelayLength(const TDesC8& aRelay) |
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148 { |
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149 if (aRelay.Length() < EFrameSize) |
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150 { |
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151 return KErrNotFound; |
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152 } |
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153 |
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154 return BigEndian::Get16(aRelay.Mid(EFrameLengthOffset).Ptr()); |
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155 } |
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156 |
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157 // ----------------------------------------------------------------------------- |
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158 // CNATFWUNSAFTcpRelayPacket::SetRelayLength |
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159 // UNSAF Relay length does not include the NATFWUNSAF header |
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160 // ----------------------------------------------------------------------------- |
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161 // |
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162 void CNATFWUNSAFTcpRelayPacket::SetRelayLength(CBufBase& aRelay) |
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163 { |
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164 SetRelayLength(aRelay, aRelay.Size() - EFrameSize); |
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165 } |
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166 |
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167 // ----------------------------------------------------------------------------- |
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168 // CNATFWUNSAFTcpRelayPacket::SetRelayLength |
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169 // ----------------------------------------------------------------------------- |
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170 // |
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171 void CNATFWUNSAFTcpRelayPacket::SetRelayLength(CBufBase& aRelay, TInt aLength) |
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172 { |
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173 __ASSERT_ALWAYS(aLength >= 0, User::Panic(KNullDesC, KErrUnderflow)); |
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174 |
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175 TUint16 bigEndianLength(0); |
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176 BigEndian::Put16(reinterpret_cast<TUint8*>(&bigEndianLength), |
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177 static_cast<TUint16>(aLength)); |
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178 |
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179 aRelay.Write(EFrameLengthOffset, &bigEndianLength, |
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180 sizeof(bigEndianLength)); |
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181 } |
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182 |
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183 // ----------------------------------------------------------------------------- |
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184 // CNATFWUNSAFTcpRelayPacket::CheckLengthL |
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185 // Check the granularity of attribute's length. |
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186 // ----------------------------------------------------------------------------- |
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187 // |
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188 void CNATFWUNSAFTcpRelayPacket::CheckLengthL(TInt aLength) const |
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189 { |
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190 __ASSERT_ALWAYS((aLength % EGranularity) == 0, User::Leave(KErrCorrupt)); |
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191 } |
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192 |
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193 // ----------------------------------------------------------------------------- |
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194 // CNATFWUNSAFTcpRelayPacket::Data |
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195 // ----------------------------------------------------------------------------- |
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196 // |
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197 EXPORT_C const TDesC8& CNATFWUNSAFTcpRelayPacket::Data() const |
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198 { |
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199 return *iData; |
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200 } |
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201 |
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202 // ----------------------------------------------------------------------------- |
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203 // CNATFWUNSAFTcpRelayPacket::Type |
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204 // ----------------------------------------------------------------------------- |
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205 // |
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206 EXPORT_C CNATFWUNSAFTcpRelayPacket::TRelayType |
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207 CNATFWUNSAFTcpRelayPacket::Type() const |
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208 { |
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209 return iType; |
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210 } |