WinInet POST via SSL (HTTPS) with pure C?

Question

Hi,

I'm stuck trying to get a WinInet HTTP POST via SSL using ONLY C. I know it's possible. Any good sample code?

Thanks so much!

EDIT: the following code seems to be working OK under C++ using WinHTTP but I need WinInet:

TCHAR szTemp[512] = {0};
BOOL bRet = FALSE;
HINTERNET hRequest = NULL;
HINTERNET hSession = NULL;
HINTERNET hConnect = NULL;
CERT_CONTEXT *pCert = {0};
HCERTSTORE hCertStore = NULL;
DWORD dwRet = 0;
DWORD dwLen = 0;
DWORD dwFlags = SECURITY_FLAG_IGNORE_CERT_CN_INVALID|
    SECURITY_FLAG_IGNORE_CERT_DATE_INVALID|
    SECURITY_FLAG_IGNORE_UNKNOWN_CA;

CString szUserAgent("Mozilla/4.0 (compatible; MSIE 5.22)");

if ( m_csServer.GetLength() < 3 ) {
 _stprintf_s( szTemp, 512, _T("Server name is invalid or empty") );
 ::MessageBox(NULL, szTemp, _T("ERROR"), MB_OK );
 return;
}

hSession = WinHttpOpen(szUserAgent,
 WINHTTP_ACCESS_TYPE_DEFAULT_PROXY,
 WINHTTP_NO_PROXY_NAME,
 WINHTTP_NO_PROXY_BYPASS, 0 );

if ( NULL == hSession ) {
 dwRet = GetLastError();
 _stprintf_s( szTemp, 512, _T("WinHttpOpen Fails - err: 0x%x"), dwRet );
 ::MessageBox(NULL, szTemp, _T("ERROR"), MB_OK );
 return;
}

hConnect = WinHttpConnect( hSession,
 m_csServer,
 INTERNET_DEFAULT_HTTPS_PORT,
 0 );

if ( NULL == hConnect ) {
 dwRet = GetLastError();
 _stprintf_s( szTemp, 512, _T("WinHttpConnect Fails - err: 0x%x"), dwRet );
 ::MessageBox(NULL, szTemp, _T("ERROR"), MB_OK );
 WinHttpCloseHandle( hSession );
 return;
}

hRequest = WinHttpOpenRequest( hConnect,
 L"GET",
 L"",
 NULL,
 WINHTTP_NO_REFERER,
 WINHTTP_DEFAULT_ACCEPT_TYPES,
 WINHTTP_FLAG_SECURE ); 

if ( NULL == hConnect ) {
 dwRet = GetLastError();
 _stprintf_s( szTemp, 512, _T("WinHttpOpenRequest Fails - err: 0x%x"), dwRet );
 ::MessageBox(NULL, szTemp, _T("ERROR"), MB_OK );
 WinHttpCloseHandle( hConnect );
 WinHttpCloseHandle( hSession );
 return;
}

bRet = WinHttpSetOption(
 hRequest,
 WINHTTP_OPTION_SECURITY_FLAGS,
 &dwFlags,
 sizeof(DWORD)
);

if ( FALSE == bRet ) {
 dwRet = GetLastError();
 _stprintf_s( szTemp, 512, _T("WinHttpSetOption Fails - err: 0x%x"), dwRet );
 ::MessageBox(NULL, szTemp, _T("ERROR"), MB_OK );
 WinHttpCloseHandle( hConnect );
 WinHttpCloseHandle( hSession );
 return;
}

bRet = WinHttpSendRequest( hRequest,
 WINHTTP_NO_ADDITIONAL_HEADERS,
 0,
 WINHTTP_NO_REQUEST_DATA,
 0,
 0,
 0 );

if ( FALSE == bRet ) {
 dwRet = GetLastError();
 _stprintf_s( szTemp, 512, _T("WinHttpSendRequest Fails - err: 0x%x"), dwRet );
 ::MessageBox(NULL, szTemp, _T("ERROR"), MB_OK );
 WinHttpCloseHandle( hRequest );
 WinHttpCloseHandle( hConnect );
 WinHttpCloseHandle( hSession );
 return;
}

dwLen = sizeof(pCert);

bRet = WinHttpQueryOption(
 hRequest,
 WINHTTP_OPTION_SERVER_CERT_CONTEXT,
 &pCert,
 &dwLen
);

if ( pCert ) {
 if ( pCert->dwCertEncodingType & X509_ASN_ENCODING ) {
  OutputDebugString( _T("X509_ASN_ENCODING") );
 }
 if ( pCert->dwCertEncodingType & PKCS_7_ASN_ENCODING ) {
  OutputDebugString( _T("PKCS_7_ASN_ENCODING") );
 }

 _stprintf_s( szTemp, 512, _T("encoded_size: %ld"), pCert->cbCertEncoded );
 OutputDebugString( szTemp );

 hCertStore = CertOpenStore( CERT_STORE_PROV_SYSTEM, 0, 0, CERT_STORE_OPEN_EXISTING_FLAG | CERT_SYSTEM_STORE_LOCAL_MACHINE, L"Root"); 

 bRet =  CertAddCertificateContextToStore(
  hCertStore,
  pCert,
  CERT_STORE_ADD_REPLACE_EXISTING,
  NULL
 );

 CertFreeCertificateContext(pCert);

 bRet = CertCloseStore( hCertStore, 0 );

 ::MessageBox( NULL, _T("Certificate Added to Store"), _T("Registered"), MB_OK );

 OutputDebugString ( _T("closed store") );
}
else {
 dwRet = GetLastError();
 _stprintf_s( szTemp, 512, _T("WinHttpQueryOption Fails - err: 0x%x"), dwRet );
 ::MessageBox(NULL, szTemp, _T("ERROR"), MB_OK );
}

WinHttpCloseHandle( hRequest );  
WinHttpCloseHandle( hConnect );
WinHttpCloseHandle( hSession );

Answer 1

Here you go: How To Make SSL Requests Using WinInet