CURLOPT_SSLVERSION(3)

CURLOPT_SSLVERSION(3)curl_easy_setopt optionCURLOPT_SSLVERSION(3)

NAME

     CURLOPT_SSLVERSION - set preferred TLS/SSL version

SYNOPSIS

     #include <curl/curl.h>

     CURLcode curl_easy_setopt(CURL *handle,  CURLOPT_SSLVERSION,
     long version);

DESCRIPTION

     Pass a long as parameter to control which version of SSL/TLS
     to attempt to use.

     Use one of the  available  defines  for  this  purpose.  The
     available options are:

          CURL_SSLVERSION_DEFAULT
               The default action. This will  attempt  to  figure
               out the remote SSL protocol version.

          CURL_SSLVERSION_TLSv1
               TLSv1.x

          CURL_SSLVERSION_SSLv2
               SSLv2

          CURL_SSLVERSION_SSLv3
               SSLv3

          CURL_SSLVERSION_TLSv1_0
               TLSv1.0 (Added in 7.34.0)

          CURL_SSLVERSION_TLSv1_1
               TLSv1.1 (Added in 7.34.0)

          CURL_SSLVERSION_TLSv1_2
               TLSv1.2 (Added in 7.34.0)

          CURL_SSLVERSION_TLSv1_3
               TLSv1.3 (Added in 7.52.0)
     The maximum TLS version can be  set  by  using  one  of  the
     CURL_SSLVERSION_MAX_ macros below. It is also possible to OR
     one  of  the  CURL_SSLVERSION_  macros  with  one   of   the
     CURL_SSLVERSION_MAX_  macros.   The  MAX macros are not sup-
     ported for SSL backends axTLS or wolfSSL.

          CURL_SSLVERSION_MAX_DEFAULT
               The flag defines the maximum supported TLS version
               as  TLSv1.2,  or  the  default  value from the SSL
               library.  (Added in 7.54.0)

          CURL_SSLVERSION_MAX_TLSv1_0

libcurl 7.58.0    Last change: January 10, 2018                 1

CURLOPT_SSLVERSION(3)curl_easy_setopt optionCURLOPT_SSLVERSION(3)

               The flag defines maximum supported TLS version  as
               TLSv1.0.  (Added in 7.54.0)

          CURL_SSLVERSION_MAX_TLSv1_1
               The flag defines maximum supported TLS version  as
               TLSv1.1.  (Added in 7.54.0)

          CURL_SSLVERSION_MAX_TLSv1_2
               The flag defines maximum supported TLS version  as
               TLSv1.2.  (Added in 7.54.0)

          CURL_SSLVERSION_MAX_TLSv1_3
               The flag defines maximum supported TLS version  as
               TLSv1.3.  (Added in 7.54.0)

DEFAULT

     CURL_SSLVERSION_DEFAULT

PROTOCOLS

     All TLS based protocols: HTTPS, FTPS,  IMAPS,  POP3S,  SMTPS
     etc.

EXAMPLE

     CURL *curl = curl_easy_init();
     if(curl) {
       curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");

       /* ask libcurl to use TLS version 1.0 or later */
       curl_easy_setopt(curl, CURLOPT_SSLVERSION, CURL_SSLVERSION_TLSv1);

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

AVAILABILITY

     SSLv2 is disabled by default since 7.18.1.  Other  SSL  ver-
     sions  availability may vary depending on which backend lib-
     curl has been built to use.

     SSLv3 is disabled by default since 7.39.0.

RETURN VALUE

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

SEE ALSO

     CURLOPT_USE_SSL(3),                 CURLOPT_HTTP_VERSION(3),
     CURLOPT_IPRESOLVE(3)

libcurl 7.58.0    Last change: January 10, 2018                 2