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POGetting redirect information with C# and C++
 

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  1. POGetting redirect information with C# and C++
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    <p><br>What am I doing wrong? I'm trying to get redirect information from a server that I use for authenticating a user. This works good with my C# code but I cannot make my C++ code working. <br>So here's the working C# code:</p> <pre><code>string postData = @"username=myUsername&amp;serviceID=someServiceId&amp;password=somePassword"; byte[] postBytes = Encoding.UTF8.GetBytes(postData); // create the proper HttpWebRequest HttpWebRequest request = (HttpWebRequest)WebRequest.Create(@"https://myAuthServer.com/login"); request.Method = "POST"; request.ContentType = "application/x-www-form-urlencoded"; request.Accept = "utf-8"; request.ContentLength = postBytes.Length; request.PreAuthenticate = true; request.AllowAutoRedirect = false; // now get the information from the login server Stream requestStream = request.GetRequestStream(); HttpWebResponse response = null; // post the data requestStream.Write(postBytes, 0, postBytes.Length); // get the response and get the wanted information response = (HttpWebResponse)request.GetResponse(); const string Session = "?session="; Uri location = new Uri(response.Headers["Location"]); m_redirect = location.Host + location.LocalPath; m_authentificationId = location.Query.Substring(Session.Length); </code></pre> <p>I use these information for further authentification. Everything is fine. <br><br>I now want to do the same with C++ code. But that code doesn't work. <br>So here is:</p> <pre><code>HINTERNET hOpen, hConnect, hReq; hOpen = InternetOpen(_T(""), INTERNET_OPEN_TYPE_DIRECT, _T(""), _T(""), 0); if(!InternetHandleValid(hOpen)) { return false; } hConnect = InternetConnect(hOpen, _T("myAuthServer.com"), INTERNET_DEFAULT_HTTPS_PORT, NULL, NULL, INTERNET_SERVICE_HTTP, 0, 0); if(!InternetHandleValid(hConnect)) { return false; } hReq = HttpOpenRequest(hConnect, _T("POST"), _T("/login"), NULL, NULL, NULL, INTERNET_FLAG_NO_AUTO_REDIRECT | INTERNET_FLAG_SECURE, 0); if(!InternetHandleValid(hReq)) { return false; } if (!HttpAddRequestHeaders(hReq, _T("Content-Type: application/x-www-form-urlencoded"), -1L, HTTP_ADDREQ_FLAG_ADD)) { return false; } if (!HttpAddRequestHeaders(hReq, _T("Expect: 100-continue"), -1L, HTTP_ADDREQ_FLAG_ADD)) { return false; } if (!HttpAddRequestHeaders(hReq, _T("Connection: Keep-Alive"), -1L, HTTP_ADDREQ_FLAG_ADD)) { return false; } if (!HttpAddRequestHeaders(hReq, _T("Accept: utf-8"), -1L, HTTP_ADDREQ_FLAG_ADD)) { return false; } CString cstrPostData = _T("username=myUsername&amp;serviceID=someServiceId&amp;password=somePassword"); char buffer[10]; _itoa_s(cstrPostData.GetLength(), buffer, 10, 10); CString cstrContentLength(buffer); if (!HttpAddRequestHeaders(hReq, _T("Content-Length: ") + cstrContentLength, -1L, HTTP_ADDREQ_FLAG_ADD)) { return false; } LPVOID lpData = (LPVOID)cstrPostData.GetBuffer(cstrPostData.GetLength()); if(HttpSendRequest(hReq, NULL, -1L, lpData, wcslen(cstrPostData))) { DWORD dwCode, dwCodeSize; dwCodeSize = sizeof(DWORD); if(!HttpQueryInfo(hReq, HTTP_QUERY_STATUS_CODE | HTTP_QUERY_FLAG_NUMBER, &amp;dwCode, &amp;dwCodeSize, NULL)) { return false; } // we need to have the 302 (Redirect) here if (dwCode != 302) { return false; } wchar_t chData[1024] = _T("\0"); DWORD dwBuffer = 1023; if(!HttpQueryInfo(hReq, HTTP_QUERY_RAW_HEADERS_CRLF, (LPVOID)chData, &amp;dwBuffer, NULL)) { return false; } CStringA cstrHeaders(chData); bool b = ExtractRedirectAndSessionFromHeader(cstrHeaders); } </code></pre> <p>Problem now is that I get <code>Location: https://myAuthServer.com/centrallogin-2.2/error.jsp</code> so no proper redirect and session. I already found out that I also get this error in my C# code when I don't set <code>request.ContentType</code> properly. But I did set the Content-Type header in my C++ code. So I have no idea what I do wrong. <br>Any further ideas? <br>EDIT: <br>Ok, I also tried it with the WinHTTP API. Here's my code:</p> <pre><code>HINTERNET hSession = NULL, hConnect = NULL, hRequest = NULL; // Use WinHttpOpen to obtain a session handle. hSession = WinHttpOpen(NULL, WINHTTP_ACCESS_TYPE_DEFAULT_PROXY, WINHTTP_NO_PROXY_NAME, WINHTTP_NO_PROXY_BYPASS, 0); hConnect = WinHttpConnect(hSession, L"myAuthServer.com", INTERNET_DEFAULT_HTTPS_PORT, 0); hRequest = WinHttpOpenRequest(hConnect, L"POST", L"/login", NULL, WINHTTP_NO_REFERER, WINHTTP_DEFAULT_ACCEPT_TYPES, WINHTTP_FLAG_SECURE); // disable auto redirects DWORD dwOptionValue = WINHTTP_DISABLE_REDIRECTS; BOOL b = WinHttpSetOption(hRequest, WINHTTP_OPTION_DISABLE_FEATURE, &amp;dwOptionValue, sizeof(dwOptionValue)); static const WCHAR szContentType[] = L"Content-Type: application/x-www-form-urlencoded\r\n"; b = WinHttpAddRequestHeaders(hRequest, szContentType, (DWORD)-1, WINHTTP_ADDREQ_FLAG_ADD &amp; WINHTTP_ADDREQ_FLAG_REPLACE); CString cstrPostData = _T("username=myUsername&amp;serviceID=someServiceId&amp;password=somePassword"); b = WinHttpSendRequest(hRequest, WINHTTP_NO_ADDITIONAL_HEADERS, -1L, WINHTTP_NO_REQUEST_DATA, 0, wcslen(cstrPostData), 0); DWORD dwBytesWritten = 0; b = WinHttpWriteData(hRequest, cstrPostData, wcslen(cstrPostData), &amp;dwBytesWritten); b = WinHttpReceiveResponse(hRequest, NULL); DWORD dwSize = sizeof(DWORD); DWORD dwStatusCode = 0; b = WinHttpQueryHeaders(hRequest, WINHTTP_QUERY_STATUS_CODE | WINHTTP_QUERY_FLAG_NUMBER, NULL, &amp;dwStatusCode, &amp;dwSize, WINHTTP_NO_HEADER_INDEX); wchar_t chData[1024] = _T("\0"); DWORD dwBuffer = 1023; b = WinHttpQueryHeaders(hRequest, WINHTTP_QUERY_RAW_HEADERS_CRLF, NULL, (LPVOID)chData, &amp;dwBuffer, NULL); CStringA cstrHeaders(chData); WinHttpCloseHandle(hSession); WinHttpCloseHandle(hConnect); WinHttpCloseHandle(hRequest); cstrPostData.ReleaseBuffer(); </code></pre> <p>So the redirect url and the session id should be in chData. But again the result is wrong. I also tried Wireshark. As this all is HTTPS I cannot read much out of it. Only thing I could compare is the number of frames etc. When using WinHTTP the Wireshark log looks similar. So I think this is the better approach. <br>Any further ideas?</p>
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