1 | /**********************************************************************
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2 | *
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3 | * httpreq.cpp
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4 | * Copyright (C) 1996
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5 | *
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6 | * A component of the fnord webserver written by [email protected].
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7 | *
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8 | * Altered for use with the Greenstone digital library software by the
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9 | * New Zealand Digital Library Project at the University of Waikato,
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10 | * New Zealand.
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11 | *
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12 | * This program is free software; you can redistribute it and/or modify
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13 | * it under the terms of the GNU General Public License as published by
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14 | * the Free Software Foundation; either version 2 of the License, or
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15 | * (at your option) any later version.
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16 | *
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17 | * This program is distributed in the hope that it will be useful,
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18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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20 | * GNU General Public License for more details.
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21 | *
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22 | * You should have received a copy of the GNU General Public License
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23 | * along with this program; if not, write to the Free Software
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24 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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25 | *
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26 | *********************************************************************/
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27 |
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28 | #include <windows.h>
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29 | #include <stdlib.h>
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30 | #include <stdio.h>
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31 | #include <string.h>
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32 | #include <memory.h>
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33 | #include "httpreq.h"
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34 | #include "parse.h"
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35 | #include "netio.h"
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36 | #include "settings.h"
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37 | #include "httpsrv.h"
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38 | #include "httpsend.h"
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39 | #include "cgiwrapper.h"
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40 | #include "d_winsock.h"
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41 |
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42 | /*
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43 | Implementation Notes:
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44 |
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45 | HTTP field names, method and version strings are converted to upper case
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46 | right after being read from the client in order to allow case insensitive
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47 | string comparisons to be done on them. Since these fields are worked with a
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48 | lot, this should help performance.
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49 | */
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50 |
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51 | //Private Data and declarations
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52 | #define IO_BUFFER_SIZE 16384 //16K IO Buffer
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53 | #define MAX_HTTP_LINE_LEN 1024 //Max length of line in a header of 1024
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54 |
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55 | //Private Function Declarations with Return Contstants
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56 |
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57 | /*
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58 | Function Name: DispatchRequest
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59 | Purpose: Manages having the request parsed, then sent to the right function
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60 | to send a response or handle an error.
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61 | Parameters:
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62 | ClientSocket - Socket the client is on
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63 | ClientSockAddr - Address of client
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64 | AddrLen - Length of address of client
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65 | IOBuffer - Pointer to buffer allocated for IO operations
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66 | ThreadNum - Number of thread that called this function for debugging purposes
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67 | Notes: I'm still playing with the keep alive support. I commented out
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68 | the stuff for giving a client a timeout because I was unable to detect
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69 | disconnects.
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70 | More Notes: Not sure if this organization will allow me to easily add support
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71 | for ISAPI filter DLLs.
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72 | */
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73 | void DispatchRequest(SOCKET ClientSocket, SOCKADDR_IN ClientSockAddr, int AddrLen, BYTE *IOBuffer);
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74 |
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75 | /*
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76 | Function Name: Get HTTP Headers
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77 | Purpose: Manages having the request parsed, then sent to the right function
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78 | to send a response or handle an error.
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79 | Parameters:
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80 | RequestInfo - Request information structure (see httpreq.h)
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81 | RequestFields - HTTP request fields structure (see httpreq.h)
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82 | Returns: GH_ERROR on error (diconnect, bad data, Windows in a bad mood, etc.)
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83 | GH_UNKNOWN_VERSION if the version number is not HTTP/0.9 or HTTP/1.x
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84 | GH_SIMPLE_REQUEST on a properly formated HTTP/0.9 request
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85 | GH_10_REQUEST on a properly formated HTTP/1.x request
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86 | */
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87 | int GetHTTPHeaders(RequestInfoT &RequestInfo, RequestFieldsT &RequestFields);
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88 | #define GH_BAD_METHOD -2
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89 | #define GH_ERROR -1
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90 | #define GH_UNKNOWN_VERSION 0
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91 | #define GH_SIMPLE_REQUEST 1
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92 | #define GH_10_REQUEST 2
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93 |
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94 | /*
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95 | Function Name: Clean Up HTTP Headers
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96 | Purpose: Cleans up memory dynamicly allocated for headers
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97 | Parameters:
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98 | RequestInfo - Request information structure (see httpreq.h)
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99 | RequestFields - HTTP request fields structure (see httpreq.h)
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100 | Returns: Nothing
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101 | */
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102 | void CleanUpHTTPHeaders(RequestInfoT &RequestInfo, RequestFieldsT &RequestFields);
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103 |
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104 | /*
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105 | Function Name: Split Query
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106 | Purpose: Splits the file and query part of a URI. In other words, it
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107 | puts the parts before and after the "?" in differnet strings.
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108 | Parameters:
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109 | URIStr - The requested URI
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110 | FileStr - String to contain the name of the path + file part of the URI
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111 | QueryStr - String to contain the query part of the URI
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112 | Returns: TRUE if there is a query, else FALSE
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113 | */
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114 | BOOL SplitQuery(char *URIStr, char *FileStr, char *QueryStr, int ThreadNum);
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115 |
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116 | /*
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117 | Function Name: Get File
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118 | Purpose: Attempts to find a given file, including looking for index.html.
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119 | Updates the given URI string so it points to the true document location
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120 | Parameters:
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121 | FilePath - Path of file, may be modified to best reflect the retrived file
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122 | or directory
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123 | URIStr - URI string, minus the query
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124 | Returns: GF_ERROR on error
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125 | GF_FILE_FOUND on success
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126 | GF_INDEX_FOUND if file is a directory with an index.html file in it
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127 | GF_DIRECTORY if file is a directory
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128 | GF_FILE_NOT_FOUND if file was found
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129 | */
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130 |
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131 | /*
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132 | Function Name: Process Simple Request
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133 | Purpose: Sends a reply to a HTTP 0.9 "simple" request
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134 | Parameters:
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135 | ClientSocket - Socket the client is on
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136 | RequestInfo - Structure storing the parsed headers
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137 | IOBuffer - Pointer to buffer allocated for IO operations
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138 | TheadNum - Number of calling thread for debugging
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139 | Notes: I should really test this and see if it works...
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140 | */
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141 | void ProcessSimpleRequest(RequestInfoT &RequestInfo, RequestFieldsT &RequestFields);
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142 |
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143 | //Public Functions
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144 | /******************************************************************************/
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145 | void RequestThread(RequestThreadMessageT *Parameters) {
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146 | SOCKADDR_IN ClientSockAddr;
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147 | SOCKET ClientSocket;
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148 | int AddrLen;
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149 | //Allocate an IO buffer for this thread
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150 | BYTE *IOBuffer = new BYTE[IO_BUFFER_SIZE];
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151 |
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152 | //Get the parameters for the request
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153 | ClientSocket = Parameters->ClientSocket;
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154 | ClientSockAddr = Parameters->ClientSockAddr;
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155 | AddrLen = Parameters->AddrLen;
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156 | DispatchRequest(ClientSocket, ClientSockAddr, AddrLen, IOBuffer);
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157 | }
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158 | /******************************************************************************/
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159 |
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160 | //Private Functions
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161 |
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162 | /******************************************************************************/
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163 | void DispatchRequest(SOCKET ClientSocket, SOCKADDR_IN ClientSockAddr, int AddrLen, BYTE *IOBuffer) {
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164 | RequestInfoT RequestInfo;
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165 | RequestFieldsT RequestFields;
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166 |
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167 | // TrayAddConnection();
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168 |
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169 | //Setup the RequestInfo structure
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170 | memset(&RequestInfo, 0, sizeof(RequestInfoT));
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171 | RequestInfo.ThreadNum = 0;
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172 | RequestInfo.IOBuffer = IOBuffer;
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173 | RequestInfo.IOBufferSize = IO_BUFFER_SIZE;
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174 | RequestInfo.ClientSocket = ClientSocket;
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175 | RequestInfo.ClientSockAddr = ClientSockAddr;
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176 | RequestInfo.AddrLen = AddrLen;
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177 | RequestInfo.KeepAlive = FALSE;
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178 |
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179 | int GetHeadersResult;
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180 | do {
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181 | //Get Headers
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182 | GetHeadersResult = GetHTTPHeaders(RequestInfo, RequestFields);
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183 |
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184 | //Figure out what version we're dealing with and deal with it
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185 | switch (GetHeadersResult) {
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186 | case GH_SIMPLE_REQUEST :
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187 | SendHTTPError(400, "HTTP Request not supported", "Only 1.x requests supported", RequestInfo, RequestFields);
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188 | // TrayIncNumServed();
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189 | break;
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190 | case GH_10_REQUEST :
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191 | ExamineURIStr(RequestFields.URIStr,&RequestInfo,&RequestFields);
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192 | // TrayIncNumServed();
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193 | break;
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194 | case GH_UNKNOWN_VERSION :
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195 | SendHTTPError(400, "HTTP Version not supported", "Only 1.x requests supported", RequestInfo, RequestFields);
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196 | // TrayIncNumServed();
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197 | break;
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198 | /* added Feb 2002 to handle stupid MS behaviour */
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199 | case GH_BAD_METHOD :
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200 | SendHTTPError(501, "Not implemented", "Only GET and POST currently implemented", RequestInfo, RequestFields);
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201 | break;
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202 | case GH_ERROR:
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203 | //Disconnect
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204 | RequestInfo.KeepAlive = FALSE;
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205 | break;
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206 | }
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207 | CleanUpHTTPHeaders(RequestInfo, RequestFields);
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208 | } while (0/*RequestInfo.KeepAlive == TRUE*/);
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209 | //Close connection
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210 | CloseSocket(RequestInfo.ClientSocket);
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211 | // TrayRemoveConnection();
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212 | }
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213 |
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214 | /******************************************************************************/
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215 | int GetHTTPHeaders(RequestInfoT &RequestInfo, RequestFieldsT &RequestFields) {
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216 | //Parsing and IO buffers
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217 | text_t CurLine;
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218 | text_t NextLine;
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219 | text_t FieldNameStr;
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220 | text_t FieldValStr;
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221 |
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222 | //Parsing and IO working vars
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223 | int ReadBufferIndex;
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224 | int DataInBuffer;
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225 | text_t::const_iterator next;
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226 | text_t::const_iterator end;
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227 |
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228 | //Clear all the fields
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229 | memset(&RequestFields, 0, sizeof(RequestFieldsT));
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230 |
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231 | ReadBufferIndex = 0;
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232 | DataInBuffer = 0;
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233 |
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234 | //Get First Line
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235 | if (GetLine(CurLine, RequestInfo.ClientSocket, RequestInfo.IOBuffer,
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236 | RequestInfo.IOBufferSize, ReadBufferIndex, DataInBuffer,
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237 | RequestInfo.ThreadNum) != 0) return GH_ERROR;
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238 | do {//Get Next Line, append it if the first charactor is space
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239 | if(GetLine(NextLine, RequestInfo.ClientSocket, RequestInfo.IOBuffer,
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240 | RequestInfo.IOBufferSize, ReadBufferIndex, DataInBuffer,
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241 | RequestInfo.ThreadNum) != 0) return GH_ERROR;
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242 | if ((*(NextLine.begin()) == ' ') || (*(NextLine.begin()) == '\t')) {
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243 | CurLine += NextLine;
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244 | }
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245 | } while ((*(NextLine.begin()) == ' ') || (*(NextLine.begin()) == '\t'));
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246 | //Method String (first word)
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247 | GetWord(RequestFields.MethodStr, CurLine.begin(), CurLine.end(), next);
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248 | uc(RequestFields.MethodStr);
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249 |
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250 | /* Added Feb 2002 - IE since about version 5 send stupid frontpage requests
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251 | for MS Document formats eg "GET /_vti_inf.html" */
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252 | if (RequestFields.MethodStr == "OPTIONS") {
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253 | return GH_BAD_METHOD;
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254 | }
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255 | //Version String (last word)
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256 | GetLastWord(RequestFields.VersionStr, CurLine.begin(), CurLine.end(), end);
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257 | uc(RequestFields.VersionStr);
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258 | text_t::const_iterator versionbegin = RequestFields.VersionStr.begin();
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259 |
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260 | if ((RequestFields.VersionStr.size() > 5) && (substr(versionbegin, versionbegin+5) != "HTTP/")) {
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261 | //No version, assume simple request
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262 | //part after method is URI
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263 | RequestFields.URIStr = CurLine;
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264 | return GH_SIMPLE_REQUEST;
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265 | }
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266 |
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267 | //URI String (in between End of first and Start of last)
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268 | //<Method> <WhiteSpace> <URI> <WhiteSpace> <Version> <CRLF>
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269 | // next^ end^
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270 | text_t spacebuffer;
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271 | text_t::const_iterator here = next;
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272 | while (here != end) {
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273 | // do this to remove trailing space
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274 | if (*here == ' ' || *here == '\t') {
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275 | spacebuffer.push_back(*here);
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276 | } else {
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277 | if (!spacebuffer.empty()) {
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278 | RequestFields.URIStr += spacebuffer;
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279 | spacebuffer.clear();
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280 | }
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281 | RequestFields.URIStr.push_back(*here);
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282 | }
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283 | ++here;
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284 | }
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285 |
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286 | //Only accept requests from HTTP/0.9 or HTTP/1.X clients, we'll
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287 | //assume that anything else will require an upgrade or patch
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288 | if ((RequestFields.VersionStr.size() > 7) && (substr(versionbegin, versionbegin+7) != "HTTP/1.")) {
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289 | return GH_UNKNOWN_VERSION;
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290 | }
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291 |
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292 | //Get the rest of the lines
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293 | CurLine = NextLine;
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294 |
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295 | while (!CurLine.empty()) {//Blank Line, we're done
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296 | do {//Get Next Line, append it if the first charactor is space
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297 | if (GetLine(NextLine, RequestInfo.ClientSocket, RequestInfo.IOBuffer,
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298 | RequestInfo.IOBufferSize, ReadBufferIndex, DataInBuffer,
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299 | RequestInfo.ThreadNum) != 0)
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300 | return GH_ERROR;
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301 | if (NextLine.empty())
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302 | break;
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303 | if ((*(NextLine.begin()) == ' ') || (*(NextLine.begin()) == '\t')) {
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304 | CurLine += NextLine;
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305 | }
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306 | } while ((*(NextLine.begin()) == ' ') || (*(NextLine.begin()) == '\t'));
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307 |
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308 | GetWord(FieldNameStr, CurLine.begin(), CurLine.end(), next);
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309 | uc(FieldNameStr);
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310 |
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311 | FieldValStr = substr(next, CurLine.end());
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312 |
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313 | //Process it
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314 | //In order of expected commonality
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315 | //All constants are in canonized, thus in upper case and case sensitive
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316 | //comparisons are used
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317 |
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318 | //--Just About Always--
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319 | if (FieldNameStr == "ACCEPT:") {
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320 | if (!RequestFields.AcceptStr.empty()) {
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321 | RequestFields.AcceptStr += ", ";
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322 | }
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323 | RequestFields.AcceptStr += FieldValStr;
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324 | }
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325 | else if (FieldNameStr == "DATE:") {
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326 | RequestFields.DateStr = FieldValStr;
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327 | }
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328 | else if (FieldNameStr == "USER-AGENT:") {
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329 | RequestFields.UserAgentStr = FieldValStr;
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330 | }
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331 | else if (FieldNameStr == "CONNECTION:") {
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332 | RequestFields.ConnectionStr = FieldValStr;
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333 | }
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334 | //--Sometimes--
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335 | else if (FieldNameStr == "ACCEPT-LANGUAGE:") {
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336 | RequestFields.AcceptLangStr = FieldValStr;
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337 | }
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338 | else if (FieldNameStr == "REFERER:") {
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339 | RequestFields.RefererStr = FieldValStr;
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340 | }
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341 | else if (FieldNameStr == "IF-MODIFIED-SINCE:") {
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342 | RequestFields.IfModSinceStr = FieldValStr;
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343 | }
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344 | //--Uncommon--
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345 | else if (FieldNameStr == "FROM:") {
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346 | RequestFields.FromStr = FieldValStr;
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347 | }
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348 | else if (FieldNameStr == "MIME-VERSION:") {
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349 | RequestFields.MIMEVerStr = FieldValStr;
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350 | }
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351 | else if (FieldNameStr == "PRAGMA:") {
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352 | RequestFields.PragmaStr = FieldValStr;
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353 | }
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354 | //--Special case--
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355 | else if (FieldNameStr == "AUTHORIZATION:") {
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356 | RequestFields.AuthorizationStr = FieldValStr;
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357 | }
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358 | else if (FieldNameStr == "CONTENT-LENGTH:") {
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359 | RequestFields.ContentLengthStr = FieldValStr;
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360 | }
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361 | else if (FieldNameStr == "CONTENT-TYPE:") {
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362 | RequestFields.ContentTypeStr = FieldValStr;
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363 | }
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364 | else if (FieldNameStr == "CONTENT-ENCODING:") {
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365 | RequestFields.ContentEncodingStr = FieldValStr;
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366 | }
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367 | else if (!FieldNameStr.empty()) {
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368 | //Add it to the other headers
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369 |
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370 | //Remove the colon
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371 | if (*(FieldNameStr.end()-1) == ':') {
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372 | FieldNameStr.pop_back();
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373 | }
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374 | RequestFields.OtherHeaders[RequestFields.NumOtherHeaders].Var = FieldNameStr;
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375 | RequestFields.OtherHeaders[RequestFields.NumOtherHeaders].Val = FieldValStr;
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376 | ++RequestFields.NumOtherHeaders;
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377 | }
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378 | CurLine = NextLine;
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379 | }
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380 |
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381 | if (!RequestFields.ContentLengthStr.empty()) { //Do we have attached data?
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382 | unsigned int NumRecv;
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383 |
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384 | RequestFields.ContentLength = RequestFields.ContentLengthStr.getint();
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385 | if (RequestFields.ContentLength > 0) {
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386 |
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387 | //Allocate memory
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388 | RequestFields.Content = new BYTE[RequestFields.ContentLength];
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389 |
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390 | //Get rest of data from get lines
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391 | NumRecv = DataInBuffer - ReadBufferIndex;
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392 |
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393 | if (NumRecv >RequestFields.ContentLength) {
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394 | //Overflow, only read what they said they'd send
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395 | NumRecv = RequestFields.ContentLength;
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396 | }
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397 | memcpy(RequestFields.Content, RequestInfo.IOBuffer + ReadBufferIndex,
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398 | NumRecv);
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399 |
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400 | while (NumRecv < RequestFields.ContentLength) {
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401 | NumRecv += GetData(RequestInfo.ClientSocket,
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402 | RequestFields.Content + NumRecv,
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403 | RequestFields.ContentLength - NumRecv,
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404 | RequestInfo.ThreadNum);
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405 | if (NumRecv < 0) return GH_ERROR;
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406 | }
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407 |
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408 | // It seems to be important on NT that all available data was read
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409 | // from the socket before the socket is closed (otherwise netscape
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410 | // throws a "connection reset by peer" error). Since netscape seems
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411 | // to send a few extra bytes in certain situations we'll make sure we
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412 | // slurp it all up here.
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413 | char *tmpbuffer = new char[100]; // this had new char(100)????
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414 | // unsigned long int nonblockmode=1;
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415 | // ioctlsocket(RequestInfo.ClientSocket, FIONBIO, &nonblockmode);
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416 | d_recv(RequestInfo.ClientSocket, tmpbuffer, 100, 0);
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417 | delete []tmpbuffer;
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418 |
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419 | }
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420 | else {
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421 | RequestFields.Content = NULL;
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422 | RequestFields.ContentLength = 0;
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423 | }
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424 | }
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425 | else {
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426 | RequestFields.Content = NULL;
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427 | RequestFields.ContentLength = 0;
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428 | }
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429 |
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430 | return GH_10_REQUEST;
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431 | }
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432 |
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433 | /******************************************************************************/
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434 | void CleanUpHTTPHeaders(RequestInfoT &RequestInfo, RequestFieldsT &RequestFields) {
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435 | //Clean up memory allocated for the Content
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436 | if (RequestFields.Content != NULL) {
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437 | delete[] RequestFields.Content;
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438 | }
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439 |
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440 | // clean up memory allocated for the IOBuffer
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441 | if (RequestInfo.IOBuffer != NULL) {
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442 | delete[] RequestInfo.IOBuffer;
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443 | RequestInfo.IOBuffer = NULL;
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444 | }
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445 | }
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