WinHTTP HTTPS certificate tester

winhttptest.c

#include <stdio.h>
#include <windows.h>
#include <winhttp.h>

void CALLBACK callbackfunc(HINTERNET hInternet,
                           DWORD_PTR context,
                           DWORD code,
                           void* pInfo,
                           DWORD infoLength) {
    if (code == WINHTTP_CALLBACK_STATUS_SECURE_FAILURE) {
        DWORD details = (DWORD) pInfo; // do not de-reference??

        printf("WINHTTP_CALLBACK_STATUS_SECURE_FAILURE: 0x%lx\n", details);

        if ((details & WINHTTP_CALLBACK_STATUS_FLAG_CERT_REV_FAILED) != 0) {
            printf("WINHTTP_CALLBACK_STATUS_FLAG_CERT_REV_FAILED\n");
        }
        if ((details & WINHTTP_CALLBACK_STATUS_FLAG_INVALID_CERT) != 0) {
            printf("WINHTTP_CALLBACK_STATUS_FLAG_INVALID_CERT\n");
        }
        if ((details & WINHTTP_CALLBACK_STATUS_FLAG_CERT_REVOKED) != 0) {
            printf("WINHTTP_CALLBACK_STATUS_FLAG_CERT_REVOKED\n");
        }
        if ((details & WINHTTP_CALLBACK_STATUS_FLAG_INVALID_CA) != 0) {
            printf("WINHTTP_CALLBACK_STATUS_FLAG_INVALID_CA\n");
        }
        if ((details & WINHTTP_CALLBACK_STATUS_FLAG_CERT_CN_INVALID) != 0) {
            printf("WINHTTP_CALLBACK_STATUS_FLAG_CERT_CN_INVALID\n");
        }
        if ((details & WINHTTP_CALLBACK_STATUS_FLAG_CERT_DATE_INVALID) != 0) {
            printf("WINHTTP_CALLBACK_STATUS_FLAG_CERT_DATE_INVALID\n");
        }
        if ((details & WINHTTP_CALLBACK_STATUS_FLAG_SECURITY_CHANNEL_ERROR) != 0) {
            printf("WINHTTP_CALLBACK_STATUS_FLAG_SECURITY_CHANNEL_ERROR\n");
        }
    }
}

int main(void) {
    DWORD dwSize = 0;
    DWORD dwDownloaded = 0;
    LPSTR pszOutBuffer;
    BOOL bResults = FALSE;
    HINTERNET hSession = NULL,
            hConnect = NULL,
            hRequest = NULL;

    // Use WinHttpOpen to obtain a session handle.
    hSession = WinHttpOpen(L"WinHTTP Example/1.0",
                           WINHTTP_ACCESS_TYPE_DEFAULT_PROXY,
                           WINHTTP_NO_PROXY_NAME,
                           WINHTTP_NO_PROXY_BYPASS, 0);

    if (WinHttpSetStatusCallback(hSession, callbackfunc, WINHTTP_CALLBACK_STATUS_SECURE_FAILURE, NULL) ==
        WINHTTP_INVALID_STATUS_CALLBACK) {
        printf("Failed to set callback: %lx\n", GetLastError());
    }

    // Specify an HTTP server.
    if (hSession)
        hConnect = WinHttpConnect(hSession, L"localhost", 8858, 0);

    // Create an HTTP request handle.
    if (hConnect)
        hRequest = WinHttpOpenRequest(hConnect, L"GET", NULL,
                                      NULL, WINHTTP_NO_REFERER,
                                      WINHTTP_DEFAULT_ACCEPT_TYPES,
                                      WINHTTP_FLAG_SECURE);

    // Send a request.
    if (hRequest)
        bResults = WinHttpSendRequest(hRequest,
                                      WINHTTP_NO_ADDITIONAL_HEADERS, 0,
                                      WINHTTP_NO_REQUEST_DATA, 0,
                                      0, 0);


    // End the request.
    if (bResults)
        bResults = WinHttpReceiveResponse(hRequest, NULL);

    // Keep checking for data until there is nothing left.
    if (bResults) {
        do {
            // Check for available data.
            dwSize = 0;
            if (!WinHttpQueryDataAvailable(hRequest, &dwSize))
                printf("Error %u in WinHttpQueryDataAvailable.\n",
                       GetLastError());

            // Allocate space for the buffer.
            pszOutBuffer = malloc(dwSize + 1);
            if (!pszOutBuffer) {
                printf("Out of memory\n");
                dwSize = 0;
            } else {
                // Read the data.
                ZeroMemory(pszOutBuffer, dwSize+1);

                if (!WinHttpReadData(hRequest, (LPVOID) pszOutBuffer,
                                     dwSize, &dwDownloaded))
                    printf("Error %u in WinHttpReadData.\n", GetLastError());
                else
                    printf("%s", pszOutBuffer);

                // Free the memory allocated to the buffer.
                free(pszOutBuffer);
            }
        } while (dwSize > 0);
    }


    // Report any errors.
    if (!bResults)
        printf("Error %d has occurred.\n", GetLastError());

    // Close any open handles.
    if (hRequest) WinHttpCloseHandle(hRequest);
    if (hConnect) WinHttpCloseHandle(hConnect);
    if (hSession) WinHttpCloseHandle(hSession);

    printf("Completed");
}