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1 // Copyright (c) 1998-2009 Nokia Corporation and/or its subsidiary(-ies). |
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2 // All rights reserved. |
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3 // This component and the accompanying materials are made available |
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4 // under the terms of "Eclipse Public License v1.0" |
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5 // which accompanies this distribution, and is available |
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6 // at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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7 // |
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8 // Initial Contributors: |
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9 // Nokia Corporation - initial contribution. |
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10 // |
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11 // Contributors: |
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12 // |
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13 // Description: |
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14 // PASV command answer parser |
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15 // Author: Philippe Gabriel |
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16 // RFC 959 defines the syntax for answer to the PASV command |
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17 // We must parse an IP+Port number (decimal, big endian) |
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18 // (ip1,ip2,ip3,ip4,ip5,port1,port2) |
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19 // We parse these regular expressions using an FSM |
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20 // Use: |
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21 // TFtpPASVAnswerParser::Reset |
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22 // to Reset the parser before we begin to parse a new answer |
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23 // TFtpPASVAnswerParser::Parse |
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24 // to parse an answer |
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25 // returns: |
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26 // TRUE: we parsed an answer (answer might be correct or inccorect) |
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27 // FALSE: An answer has not been completely parsed yet |
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28 // TFtpPASVAnswerParser::Fetch |
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29 // Fetch an answer |
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30 // returns: |
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31 // TRUE: We got a valid answer |
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32 // FALSE: The answer we got had an invalid syntax |
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33 // |
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34 // |
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35 |
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36 /** |
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37 @file PASVANS.CPP |
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38 @internalComponent |
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39 */ |
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40 |
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41 #include "DEBUG.H" |
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42 #include "PASVANS.H" |
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43 #include <e32base.h> |
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44 #include <e32test.h> |
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45 #include <in_sock.h> |
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46 |
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47 // |
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48 // Definitions |
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49 // |
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50 |
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51 TBool TFtpPASVAnswerParser::Fetch(TInetAddr& aFTPServerAddress) |
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52 { |
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53 __ASSERT_DEBUG((iState == ESuccess) || (iState == EFailed), User::Panic(_L("TFtpPASVAnswerParser::Fetch incorrect state"), 0)); |
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54 if(iState != ESuccess) |
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55 return FALSE; |
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56 aFTPServerAddress = iFTPServerAddress; |
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57 return TRUE; |
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58 } |
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59 |
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60 void TFtpPASVAnswerParser::Reset(void) |
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61 { |
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62 iState = EIdle; |
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63 iFTPServerAddress.SetFamily(KAFUnspec); |
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64 } |
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65 |
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66 TBool TFtpPASVAnswerParser::Parse(const TDesC8& aBuffer, const TInetAddr& aAddr) |
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67 { |
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68 if (aAddr.Family() == KAfInet) |
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69 return ParsePASV(aBuffer); |
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70 else |
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71 { |
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72 __ASSERT_DEBUG(aAddr.Family() == KAfInet6, User::Panic(_L("TFtpPASVAnswerParser"), 0)); |
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73 iFTPServerAddress.SetAddress(aAddr.Ip6Address()); |
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74 return ParseEPSV(aBuffer); |
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75 } |
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76 } |
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77 |
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78 TBool TFtpPASVAnswerParser::ParsePASV(const TDesC8& aBuffer) |
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79 { |
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80 const TUint8* c; |
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81 TInt bufLen; |
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82 TUint aIPAndPort[6]; |
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83 |
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84 if ((iState == ESuccess) || (iState == EFailed)) |
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85 // Already parsed an answer |
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86 return TRUE; |
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87 for (c= aBuffer.Ptr(),bufLen = aBuffer.Length();(bufLen>0);bufLen--,c++) |
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88 { |
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89 switch (iState) |
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90 { |
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91 case EIdle: |
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92 if (*c=='(') |
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93 { |
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94 /* We fetched a (, begin parsing*/ |
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95 iNumberCounter=0; |
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96 iState++; |
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97 } |
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98 break; |
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99 case EBeginParse: |
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100 if ((*c>='0') && (*c<='9')) |
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101 { |
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102 iDigit.Zero(); |
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103 iDigit.Append(*c); |
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104 iState++; |
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105 } |
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106 break; |
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107 case EParsing: |
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108 if ((*c>='0') && (*c<='9')) |
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109 if(iDigit.Length() == 3) |
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110 { |
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111 // We're stuffed, we got more than 3 digits |
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112 iState = EFailed; |
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113 return TRUE; |
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114 } |
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115 else |
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116 { |
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117 iDigit.Append(*c); |
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118 } |
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119 else // We should have a , or a ) I accept everything |
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120 { |
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121 |
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122 //[1] Translate the last number that we parsed |
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123 TUint tempValue; |
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124 TLex input(iDigit); |
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125 input.Val(tempValue,EDecimal); |
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126 if(tempValue>255) |
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127 { |
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128 // If Value out of bound, we're stuffed |
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129 // Error bail out |
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130 iState = EFailed; |
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131 return TRUE; |
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132 } |
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133 aIPAndPort[iNumberCounter++] = tempValue; |
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134 // [2] Are we waiting for more numbers? |
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135 if(iNumberCounter == 6) |
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136 { |
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137 // OKay We've finished |
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138 iFTPServerAddress.SetAddress(INET_ADDR(aIPAndPort[0],aIPAndPort[1],aIPAndPort[2],aIPAndPort[3])); |
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139 iFTPServerAddress.SetPort(aIPAndPort[4]<<8 | aIPAndPort[5]); |
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140 iState = ESuccess; |
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141 return TRUE; |
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142 } |
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143 else |
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144 // Fetch next number |
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145 iState = EBeginParse; |
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146 } |
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147 break; |
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148 default: |
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149 break; |
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150 } |
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151 } |
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152 return FALSE; |
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153 } |
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154 |
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155 TBool TFtpPASVAnswerParser::ParseEPSV(const TDesC8& aBuffer) |
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156 { |
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157 TInt bufLen = aBuffer.Length(); |
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158 TUint port = 0; |
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159 |
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160 if ((iState == ESuccess) || (iState == EFailed)) |
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161 // Already parsed an answer |
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162 return ETrue; |
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163 |
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164 for (const TUint8* c = aBuffer.Ptr();bufLen>0;bufLen--,c++) |
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165 { |
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166 switch (iState) |
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167 { |
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168 case EIdle: |
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169 if (*c=='(') |
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170 { |
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171 /* We fetched a (, begin parsing*/ |
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172 iState = EBeginParse; |
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173 } |
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174 break; |
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175 case EBeginParse: |
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176 if (TChar(*c).IsDigit()) |
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177 { |
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178 port = *c - '0'; |
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179 iState = EParsing; |
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180 } |
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181 break; |
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182 case EParsing: |
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183 if (TChar(*c).IsDigit()) |
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184 { |
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185 port = port*10 + (*c - '0'); |
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186 } |
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187 else // We should have a "|", end the parsing |
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188 { |
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189 if(port>(1<<16) || *c != '|') |
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190 { |
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191 // If Value out of bound or the last character is not a '|' |
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192 // then the parsing failed |
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193 iState = EFailed; |
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194 return ETrue; |
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195 } |
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196 |
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197 iFTPServerAddress.SetPort(port); |
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198 iState = ESuccess; |
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199 return ETrue; |
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200 } |
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201 break; |
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202 default: |
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203 break; |
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204 } |
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205 } |
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206 return EFalse; |
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207 } |