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1 /* |
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2 * Copyright (c) 2004 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: General RTCP packet handling routines. |
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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 // INCLUDES |
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22 #include "srtppacketrtcp.h" |
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23 #include "srtputils.h" |
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24 #include "srtpcryptohandler.h" |
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25 #include "srtpcryptocontext.h" |
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26 #include "srtpmasterkey.h" |
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27 #include "srtpmastersalt.h" |
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28 |
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29 // ----------------------------------------------------------------------------- |
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30 // CSRTPPacketRTCP::CSRTPPacketRTCP |
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31 // ----------------------------------------------------------------------------- |
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32 // |
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33 CSRTPPacketRTCP::CSRTPPacketRTCP(const TDesC8& aPacket, |
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34 CSRTPCryptoHandler& aHandler) |
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35 : CSRTPPacket(aPacket, aHandler) |
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36 { |
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37 |
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38 } |
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39 |
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40 // ----------------------------------------------------------------------------- |
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41 // CSRTPPacketRTCP::~CSRTPPacketRTCP |
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42 // ----------------------------------------------------------------------------- |
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43 // |
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44 CSRTPPacketRTCP::~CSRTPPacketRTCP() |
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45 { |
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46 |
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47 } |
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48 |
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49 // --------------------------------------------------------------------------- |
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50 // Two-phased constructor. |
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51 // |
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52 // --------------------------------------------------------------------------- |
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53 // |
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54 CSRTPPacketRTCP* CSRTPPacketRTCP::NewL(const TDesC8& aPacket, |
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55 CSRTPCryptoHandler& aHandler) |
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56 { |
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57 CSRTPPacketRTCP* self = new( ELeave )CSRTPPacketRTCP( aPacket, aHandler); |
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58 CleanupStack::PushL( self ); |
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59 self->ConstructL(); |
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60 CleanupStack::Pop( self ); |
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61 return self; |
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62 } |
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63 |
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64 // ----------------------------------------------------------------------------- |
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65 // void CSRTPPacketRTCP::ConstructL |
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66 // ----------------------------------------------------------------------------- |
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67 // |
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68 void CSRTPPacketRTCP::ConstructL() |
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69 { |
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70 CSRTPPacket::ConstructL(); |
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71 UpdateHeaderLengthL(); |
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72 UpdatePayloadLength(); |
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73 UpdatePayload(); |
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74 } |
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75 |
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76 // --------------------------------------------------------------------------- |
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77 // CSRTPPacketRTCP::UpdatePayloadLength() |
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78 // --------------------------------------------------------------------------- |
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79 // |
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80 void CSRTPPacketRTCP::UpdatePayloadLength() |
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81 { |
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82 // In RTP case the payload length is easy to calculate |
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83 iPayloadLength = iPacket.Length() - iHeaderLength; |
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84 if ( iPacket.Length() <= iHeaderLength ) |
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85 { |
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86 iPayloadLength = 0; |
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87 } |
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88 } |
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89 |
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90 // --------------------------------------------------------------------------- |
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91 // CSRTPPacketRTCP::UpdateHeaderLengthL() |
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92 // --------------------------------------------------------------------------- |
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93 // |
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94 void CSRTPPacketRTCP::UpdateHeaderLengthL() |
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95 { |
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96 TInt size = iPacket.Length(); |
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97 |
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98 const TUint8 *pointer = iDataP; |
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99 |
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100 // version |
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101 if ( ( ( pointer[0] & 0xC0 ) >> 6 ) != 2/*RTPVersion*/ ) |
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102 { |
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103 User::Leave(KErrCorrupt); |
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104 } |
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105 |
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106 // padding |
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107 if ( pointer[0] & 0x20 ) |
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108 { |
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109 size -= iDataP[size - 1]; |
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110 } |
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111 |
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112 // determine RTCP packet type |
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113 TInt pt = static_cast<TInt>( pointer[1] ); |
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114 |
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115 if ( ( pt!= 200 ) && (pt != 201) && |
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116 ( pt != 202) && ( pt != 203 ) && |
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117 ( pt != 204 ) ) |
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118 { |
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119 User::Leave(KErrCorrupt); |
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120 } |
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121 |
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122 // source/report Count |
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123 //TInt sourceCount = ( pointer[0] & 0x1F ); |
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124 |
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125 pointer += 2; |
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126 |
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127 TInt length =static_cast<TInt>( TSRTPUtils::Read16( pointer ) ); |
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128 |
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129 if ( length * 4 > size ) |
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130 { |
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131 User::Leave(KErrCorrupt); |
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132 } |
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133 pointer += 2; |
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134 |
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135 // SSRC of sender in case of RR |
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136 if ( pt == 201 || pt==200 ) |
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137 { |
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138 TUint32 SSRC = TSRTPUtils::Read32( pointer ); |
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139 pointer += 4; |
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140 } |
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141 |
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142 |
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143 |
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144 //RFC 3711 3.4 - RR & SR |
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145 iHeaderLength =pointer-iDataP; |
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146 } |
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147 // --------------------------------------------------------------------------- |
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148 // CSRTPPacketRTCP::CountEncryptedPacketSizeL() |
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149 // --------------------------------------------------------------------------- |
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150 // |
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151 TUint CSRTPPacketRTCP::CountEncryptedPacketSizeL() |
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152 { |
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153 TUint srtpPacketSize = iHeaderLength + iPayloadLength + KSRTCPPacketIndexLength4; |
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154 srtpPacketSize += iHandler.Context().MasterKey().MKI().Length(); |
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155 if ( iHandler.Context().CryptoParams().iSrtcpAuthAlg == EAuthHMAC_SHA1) |
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156 { |
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157 srtpPacketSize += iHandler.Context().CryptoParams().iSrtcpAuthTagLen/8; |
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158 } |
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159 |
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160 return srtpPacketSize; |
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161 } |
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162 |
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163 // --------------------------------------------------------------------------- |
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164 // CSRTPPacketRTCP::CreateEncryptedPacketL() |
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165 // --------------------------------------------------------------------------- |
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166 // |
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167 HBufC8* CSRTPPacketRTCP::CreateEncryptedPacketL(TUint8* aEncryptedPayloadPtr) |
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168 { |
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169 TUint srtpPacketSize = CountEncryptedPacketSizeL(); |
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170 |
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171 return CopyHeaderAndPayloadL(srtpPacketSize, aEncryptedPayloadPtr); |
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172 } |
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173 |
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174 |
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175 // --------------------------------------------------------------------------- |
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176 // CSRTPPacketRTCP::SetPacketIndex() |
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177 // --------------------------------------------------------------------------- |
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178 // |
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179 void CSRTPPacketRTCP::SetPacketIndex(TUint64 aPacketIndex) |
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180 { |
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181 iPacketIndex = aPacketIndex; |
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182 } |
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183 // --------------------------------------------------------------------------- |
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184 // CSRTPPacketRTCP::PacketIndex() |
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185 // --------------------------------------------------------------------------- |
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186 // |
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187 TUint64 CSRTPPacketRTCP::PacketIndex() |
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188 { |
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189 return iPacketIndex; |
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190 } |
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191 |
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192 // --------------------------------------------------------------------------- |
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193 // CSRTPPacketRTCP::CreateDecryptedPacketL() |
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194 // --------------------------------------------------------------------------- |
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195 // |
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196 HBufC8* CSRTPPacketRTCP::CreateDecryptedPacketL(TUint8* /*aDecryptedPayloadPtr*/) |
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197 { |
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198 User::Leave(KErrTotalLossOfPrecision); |
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199 return NULL; |
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200 } |
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201 // --------------------------------------------------------------------------- |
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202 // CSRTPPacketRTCP::AuthenticationTag() |
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203 // --------------------------------------------------------------------------- |
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204 // |
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205 TPtrC8 CSRTPPacketRTCP::AuthenticationTag() |
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206 { |
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207 return NULL; |
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208 } |
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209 // --------------------------------------------------------------------------- |
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210 // CSRTPPacketRTCP::MasterKeyIdentifier() |
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211 // --------------------------------------------------------------------------- |
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212 // |
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213 TPtrC8 CSRTPPacketRTCP::MasterKeyIdentifier() |
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214 { |
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215 return NULL; |
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216 } |
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217 |