在Linux上使用Easy Curl通过SSL进行FTP上载

我使用libcurl示例在Linux机器上开发了一个“C”应用程序，我工作得很好。我被要求对“控制通道和数据通道的数据加密”都使用SSL。我找不到将SSL添加到下面的示例中的示例。以下是FTP程序的核心：

// get a FILE * of the same file
hd_src = fopen(local_file, "rb");

// curl init
curl_global_init(CURL_GLOBAL_ALL);

// get a curl handle
curl = curl_easy_init();

if (curl) { // build a list of commands to pass to libcurl
    headerlist = curl_slist_append(headerlist, buf_1);
#ifdef DEBUG
    // we want to use our own read function
    curl_easy_setopt(curl, CURLOPT_READFUNCTION, read_callback);
#endif

    // enable uploading
    curl_easy_setopt(curl, CURLOPT_UPLOAD, 1L);

    // specify target
    curl_easy_setopt(curl, CURLOPT_URL, ftp_url);
    curl_easy_setopt(curl, CURLOPT_USERPWD, user_password);
    curl_easy_setopt(curl, CURLOPT_PORT, 21);

    // pass in that last of FTP commands to run after the transfer
    curl_easy_setopt(curl, CURLOPT_POSTQUOTE, headerlist);

    // now specify which file to upload
    curl_easy_setopt(curl, CURLOPT_READDATA, hd_src);

    // Set the size of the file to upload
    curl_easy_setopt(curl, CURLOPT_INFILESIZE_LARGE, (curl_off_t) fsize);

    // Now run off and do what you've been told!
    res = curl_easy_perform(curl);

    // Check for errors
    if (res != CURLE_OK) {
        char *s;
        s = malloc((sizeof(char) * 100) + 1);
        sprintf(s, "curl_easy_perform() failed: %s - Error Number: %d\n",
        curl_easy_strerror(res), res);
        returnResults->error = true;
        returnResults->errorMessage = s;
        return returnResults;
    }

    // clean up the FTP commands list
    curl_slist_free_all(headerlist);

    // always cleanup
    curl_easy_cleanup(curl);
}

fclose(hd_src); // close the local file
curl_global_cleanup();

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然而，libcurl站点上有一个现有的示例代码，显示了如何使用FTP-SSL下载文件：-它显示了您需要添加的很少的SSL魔法。上传的魔力是一样的：

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事实上，您可以将这一行添加到。它将为您进行FTPS上传。

您的问题是什么？

/* We activate SSL and we require it for both control and data */
curl_easy_setopt(curl, CURLOPT_USE_SSL, CURLUSESSL_ALL);