CURLOPT_USE_SSL(3)

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_PROXY_SSLVERSION(3), CURLOPT_SSL_OPTIONS(3),