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
              do not attempt to use SSL.

       CURLUSESSL_TRY
              Try  using  SSL,  proceed  as  normal  otherwise.  Note  that  server may close the
              connection if the negotiation does not succeed.

       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

       This functionality affects ftp, imap, pop3 and smtp

EXAMPLE

       int main(void)
       {
         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, (long)CURLUSESSL_ALL);

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

HISTORY

       This option was known as CURLOPT_FTP_SSL up to 7.16.4, and the  constants  were  known  as
       CURLFTPSSL_* Handled by LDAP since 7.81.0. Fully supported by the OpenLDAP backend only.

AVAILABILITY

       Added in curl 7.17.0

RETURN VALUE

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

SEE ALSO

       CURLOPT_PROXY_SSLVERSION(3), CURLOPT_SSLVERSION(3), CURLOPT_SSL_OPTIONS(3)