NAME

       CURLOPT_USE_SSL - request using SSL / TLS for the transfer

SYNOPSIS

       #include <curl/curl.h>

       CURLcode curl_easy_setopt(CURL *handle, CURLOPT_USE_SSL, long level);

DESCRIPTION

       Pass  a long using one of the values from below, to make libcurl use your desired level of
       SSL for the transfer.

       These are all protocols that start out plain text and get  "upgraded"  to  SSL  using  the
       STARTTLS command.

       This is for enabling SSL/TLS when you use FTP, SMTP, POP3, IMAP etc.

       CURLUSESSL_NONE
              Don't attempt to use SSL.

       CURLUSESSL_TRY
              Try using SSL, proceed as normal otherwise.

       CURLUSESSL_CONTROL
              Require SSL for the control connection or fail with CURLE_USE_SSL_FAILED.

       CURLUSESSL_ALL
              Require SSL for all communication or fail with CURLE_USE_SSL_FAILED.

DEFAULT

       CURLUSESSL_NONE

PROTOCOLS

       FTP, SMTP, POP3, IMAP

EXAMPLE

       CURL *curl = curl_easy_init();
       if(curl) {
         curl_easy_setopt(curl, CURLOPT_URL, "ftp://example.com/dir/file.ext");

         /* require use of SSL for this, or fail */
         curl_easy_setopt(curl, CURLOPT_USE_SSL, CURLUSESSL_ALL);

         /* Perform the request */
         curl_easy_perform(curl);
       }

AVAILABILITY

       Added  in 7.11.0. This option was known as CURLOPT_FTP_SSL up to 7.16.4, and the constants
       were known as CURLFTPSSL_*

RETURN VALUE

       Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.

SEE ALSO

       CURLOPT_SSLVERSION(3), CURLOPT_SSL_OPTIONS(3),