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curl_global_sslset(3)

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curl_global_sslset(3)      Library Functions Manual      curl_global_sslset(3)

NAME
       curl_global_sslset - select SSL backend to use

SYNOPSIS
       #include <curl/curl.h>

       CURLsslset curl_global_sslset(curl_sslbackend id,
                                     const char *name,
                                     const curl_ssl_backend ***avail);

DESCRIPTION
       This  function  configures  at  runtime  which  SSL backend to use with
       libcurl. This function can only be used to select an SSL backend  once,
       and it must be called before curl_global_init(3).

       The  backend can be identified by the id (e.g. CURLSSLBACKEND_OPENSSL).
       The backend can also be specified via the name parameter for a case in‐
       sensitive match (passing CURLSSLBACKEND_NONE as id).  If  both  id  and
       name are specified, the name is ignored.

       If  neither  id  nor  name  are  specified,  the  function  fails  with
       CURLSSLSET_UNKNOWN_BACKEND and set the avail pointer to the NULL-termi‐
       nated list of available backends. The available backends are those that
       this particular build of libcurl supports.

       Since libcurl 7.60.0, the avail pointer is always set to  the  list  of
       alternatives if non-NULL.

       Upon success, the function returns CURLSSLSET_OK.

       If  the  specified  SSL  backend is not available, the function returns
       CURLSSLSET_UNKNOWN_BACKEND and sets the avail pointer to a  NULL-termi‐
       nated  list  of  available SSL backends. In this case, you may call the
       function again to try to select a different backend.

       The SSL backend can be set only once. If it has  already  been  set,  a
       subsequent  attempt  to change it results in a CURLSSLSET_TOO_LATE get‐
       ting returned.

       This  function  is  thread-safe  since  libcurl  7.84.0  if   curl_ver‐
       sion_info(3)  has  the  CURL_VERSION_THREADSAFE  feature  bit set (most
       platforms).

       If this is not thread-safe, you must not call this  function  when  any
       other  thread in the program (i.e. a thread sharing the same memory) is
       running.  This does not  just  mean  no  other  thread  that  is  using
       libcurl.

Names
       SSL backend names (case-insensitive): GnuTLS, mbedTLS, OpenSSL, Rustls,
       Schannel, wolfSSL

       The  name "OpenSSL" is used for all versions of OpenSSL and its associ‐
       ated forks/flavors in  this  function.  OpenSSL,  BoringSSL,  LibreSSL,
       quictls  and  AmiSSL  are  all supported by libcurl, but in the eyes of
       curl_global_sslset(3) they are all just "OpenSSL". They all mostly pro‐
       vide the same API.  curl_version_info(3) can return more specific  info
       about the exact OpenSSL flavor and version number in use.

struct
       typedef struct {
         curl_sslbackend id;
         const char *name;
       } curl_ssl_backend;

       typedef enum {
         CURLSSLBACKEND_NONE = 0,
         CURLSSLBACKEND_OPENSSL = 1, /* or one of its forks */
         CURLSSLBACKEND_GNUTLS = 2,
         CURLSSLBACKEND_NSS = 3,
         CURLSSLBACKEND_GSKIT = 5, /* deprecated */
         CURLSSLBACKEND_POLARSSL = 6, /* deprecated */
         CURLSSLBACKEND_WOLFSSL = 7,
         CURLSSLBACKEND_SCHANNEL = 8,
         CURLSSLBACKEND_SECURETRANSPORT = 9, /* deprecated */
         CURLSSLBACKEND_AXTLS = 10, /* deprecated */
         CURLSSLBACKEND_MBEDTLS = 11,
         CURLSSLBACKEND_MESALINK = 12, /* deprecated */
         CURLSSLBACKEND_BEARSSL = 13, /* deprecated */
         CURLSSLBACKEND_RUSTLS = 14
       } curl_sslbackend;

PROTOCOLS
       This functionality affects all supported protocols

EXAMPLE
       int main(void)
       {
         int i;
         /* choose a specific backend */
         curl_global_sslset(CURLSSLBACKEND_WOLFSSL, NULL, NULL);

         /* list the available ones */
         const curl_ssl_backend **list;
         curl_global_sslset(CURLSSLBACKEND_NONE, NULL, &list);

         for(i = 0; list[i]; i++)
           printf("SSL backend #%d: '%s' (ID: %d)\n",
                  i, list[i]->name, list[i]->id);
       }

AVAILABILITY
       Added in curl 7.56.0

RETURN VALUE
       If  this  function  returns CURLSSLSET_OK, the backend was successfully
       selected.

       If the chosen backend is unknown (or support for the chosen backend has
       not been compiled into libcurl), the  function  returns  CURLSSLSET_UN‐
       KNOWN_BACKEND.

       If    the    backend    had   been   configured   previously,   or   if
       curl_global_init(3) has  already  been  called,  the  function  returns
       CURLSSLSET_TOO_LATE.

       If this libcurl was built completely without SSL support, with no back‐
       ends at all, this function returns CURLSSLSET_NO_BACKENDS.


ATTRIBUTES
       See attributes(7) for descriptions of the following attributes:

       box; cbp-1 | cbp-1 l | l .  ATTRIBUTE TYPE ATTRIBUTE VALUE = Availabil‐
       ity   web/curl = Stability Uncommitted

SEE ALSO
       curl_global_init(3), libcurl(3)



NOTES
       Source  code  for open source software components in Oracle Solaris can
       be found at https://www.oracle.com/downloads/opensource/solaris-source-
       code-downloads.html.

       This software was built from source available at:
       https://github.com/oracle/solaris-userland

       The original community source was downloaded from:
       https://curl.se/download/curl-8.17.0.tar.bz2

       Further information about this software can be found on the open source
       community website at http://curl.haxx.se/.

libcurl                           2025-12-01             curl_global_sslset(3)
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