[問題] 用C++編寫的cgi
遇到的問題： (題意請描述清楚)設計一個帳號密碼的登入系統，
能記帳號，並且在帳密輸入以後
導向表格輸入的頁面，不過現在光是
由G++ compile好的.cgi本身，
就無法瀏覽其內容，在此求教於各位大大。
（附上.cpp的原始碼，
大致是參考Deitel的書。）
希望得到的正確結果：開啟cgi頁面
程式跑出來的錯誤結果： 用firefox執行的結果是會叫我下載.cgi檔OB
開發平台： g++ on Ubuntu
有問題的code： (請善用置底文標色功能)
// Program to output an XHTML form, verify the
// username and password entered, and add members.
#include <iostream>
using std::cerr;
using std::cin;
using std::cout;
using std::ios;
#include <fstream>
using std::fstream;
#include <string>
using std::string;
#include <cstdlib>
using std::getenv;
using std::atoi;
using std::exit;
void header();
void writeCookie();
int main()
{
char query[ 1024 ] = "";
string dataString = "";
// strings to store username and password
string userName = "";
string passWord = "";
int contentLength = 0;
bool newMember = false;
// data was posted
if ( getenv( "CONTENT_LENGTH" ) )
{
// retrieve query string
contentLength = atoi( getenv( "CONTENT_LENGTH" ) );
cin.read( query, contentLength );
dataString = query;
// find username location
int userLocation = dataString.find( "user=" ) + 5;
int endUser = dataString.find( "&" );
// find password location
int passwordLocation = dataString.find( "password=" ) + 9;
int endPassword = dataString.find( "&new" );
if ( endPassword > 0 ) // new membership requested
{
newMember = true;
passWord = dataString.substr(
passwordLocation, endPassword - passwordLocation );
} // end if
else // existing member
passWord = dataString.substr( passwordLocation );
userName = dataString.substr(
userLocation, endUser - userLocation );
} // end if
// no data was retrieved
if ( dataString == "" )
{
header();
cout << "<p>Please login.</p>";
// output login form
cout << "<form method = \"post\" action = \"/cgi-bin/login.cgi\">"
<< "<p>User Name: <input type = \"text\" name = \"user\"/><br/>"
<< "Password: <input type = \"password\" name = \"password\"/>"
<< "<br/>New? <input type = \"checkbox\" name = \"new\""
<< " value = \"1\"/></p>"
<< "<input type = \"submit\" value = \"login\"/></form>";
} // end if
else // process entered data
{
string fileUsername = "";
string filePassword = "";
bool userFound = false;
// open user data file for reading and writing
fstream userData( "userdata.txt", ios::in | ios::out);
if ( !userData ) // could not open file
{
cerr << "Could not open database.";
exit( 1 );
} // end if
// add new member
if ( newMember )
{
// read username and password from file
while ( !userFound && userData >> fileUsername >> filePassword )
{
if ( userName == fileUsername ) // name is already taken
userFound = true;
} // end while
if ( userFound ) // user name is taken
{
header();
cout << "<p>This name has already been taken.</p>"
<< "<a href=\"/cgi-bin/login.cgi\">Try Again</a>";
} // end if
else // process data
{
writeCookie(); // write cookie
header();
// write user data to file
userData.clear(); // clear eof, allow write at end of file
userData << "\n" << userName << "\n" << passWord;
cout << "<p>Your information has been processed."
<< "<a href=\"/cgi-bin/shop.cgi\">Start Shopping</a></p>";
} // end else
} // end if
else // search for password if entered
{
bool authenticated = false;
// read in user data
while ( !userFound && userData >> fileUsername >> filePassword )
{
// username was found
if ( userName == fileUsername )
{
userFound = true;
// determine whether password is correct
// and assign bool result to authenticated
authenticated = ( passWord == filePassword );
} // end if
} // end while
// user is authenticated
if ( authenticated )
{
writeCookie();
header();
cout << "<p>Thank you for returning, " << userName << "!</p>"
<< "<a href=\"/cgi-bin/form.html\">Start to enter text</a>";
} // end if
else // user not authenticated
{
header();
if ( userFound ) // password is incorrect
cout << "<p>You have entered an incorrect password. "
<< "Please try again.</p>"
<< "<a href=\"/cgi-bin/login.cgi\">Back to login</a>";
else // user is not registered
cout << "<p>You are not a registered user.</p>"
<< "<a href=\"/cgi-bin/login.cgi\">Register</a>";
} // end else
} // end else
} // end else
cout << "</body>\n</html>\n";
return 0;
} // end main
// function to output header
void header()
{
cout << "Content-Type: text/html\n\n"; // output header
// output XML declaration and DOCTYPE
cout << "<?xml version = \"1.0\"?>"
<< "<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.1//EN\" "
<< "\"";" rel="nofollow">http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd\">";
// output html element and some of its contents
cout << "<html xmlns = \""" rel="nofollow">http://www.w3.org/1999/xhtml\">"
<< "<head><title>Login Page</title></head><body>";
} // end function header
// function to write cookie data
void writeCookie()
{
string expires = "Friday, 14-MAY-10 16:00:00 GMT";
cout << "Set-Cookie: CART=; expires=" << expires << "; path=\n";
} // end function writeCookie
補充說明：
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