Provided by: libcurl4-doc_7.65.3-1ubuntu3_all bug

NAME

       curl_version_info - returns run-time libcurl version info

SYNOPSIS

       #include <curl/curl.h>

       curl_version_info_data *curl_version_info( CURLversion age);

DESCRIPTION

       Returns  a pointer to a filled in static struct with information about various features in
       the running version of libcurl. age should be set to the version of this functionality  by
       the time you write your program. This way, libcurl will always return a proper struct that
       your program understands, while programs in the  future  might  get  a  different  struct.
       CURLVERSION_NOW will be the most recent one for the library you have installed:

               data = curl_version_info(CURLVERSION_NOW);

       Applications  should  use  this  information to judge if things are possible to do or not,
       instead of using compile-time checks, as dynamic/DLL libraries can be changed  independent
       of applications.

       The curl_version_info_data struct looks like this

       typedef struct {
         CURLversion age;          /* see description below */

         /* when 'age' is 0 or higher, the members below also exist: */
         const char *version;      /* human readable string */
         unsigned int version_num; /* numeric representation */
         const char *host;         /* human readable string */
         int features;             /* bitmask, see below */
         char *ssl_version;        /* human readable string */
         long ssl_version_num;     /* not used, always zero */
         const char *libz_version; /* human readable string */
         const char * const *protocols; /* protocols */

         /* when 'age' is 1 or higher, the members below also exist: */
         const char *ares;         /* human readable string */
         int ares_num;             /* number */

         /* when 'age' is 2 or higher, the member below also exists: */
         const char *libidn;       /* human readable string */

         /* when 'age' is 3 or higher (7.16.1 or later), the members below also
            exist  */
         int iconv_ver_num;       /* '_libiconv_version' if iconv support enabled */

         const char *libssh_version; /* human readable string */

         /* when 'age' is 4 or higher (7.57.0 or later), the members below also
            exist  */
         unsigned int brotli_ver_num; /* Numeric Brotli version
                                         (MAJOR << 24) | (MINOR << 12) | PATCH */
         const char *brotli_version; /* human readable string. */

       } curl_version_info_data;

       age  describes  what  the age of this struct is. The number depends on how new the libcurl
       you're using is. You are however guaranteed to get a  struct  that  you  have  a  matching
       struct for in the header, as you tell libcurl your "age" with the input argument.

       version is just an ascii string for the libcurl version.

       version_num  is  a  24 bit number created like this: <8 bits major number> | <8 bits minor
       number> | <8 bits patch number>. Version 7.9.8 is therefore returned as 0x070908.

       host is an ascii string showing what host information that this libcurl was built for.  As
       discovered by a configure script or set by the build environment.

       features can have none, one or more bits set, and the currently defined bits are:

              CURL_VERSION_IPV6
                     supports IPv6

              CURL_VERSION_KERBEROS4
                     supports Kerberos V4 (when using FTP)

              CURL_VERSION_KERBEROS5
                     supports  Kerberos  V5  authentication for FTP, IMAP, POP3, SMTP and SOCKSv5
                     proxy (Added in 7.40.0)

              CURL_VERSION_SSL
                     supports SSL (HTTPS/FTPS) (Added in 7.10)

              CURL_VERSION_LIBZ
                     supports HTTP deflate using libz (Added in 7.10)

              CURL_VERSION_NTLM
                     supports HTTP NTLM (added in 7.10.6)

              CURL_VERSION_GSSNEGOTIATE
                     supports HTTP GSS-Negotiate (added in 7.10.6)

              CURL_VERSION_DEBUG
                     libcurl was built with debug capabilities (added in 7.10.6)

              CURL_VERSION_CURLDEBUG
                     libcurl was built with memory tracking debug capabilities. This is mainly of
                     interest for libcurl hackers. (added in 7.19.6)

              CURL_VERSION_ASYNCHDNS
                     libcurl  was  built with support for asynchronous name lookups, which allows
                     more exact timeouts (even on Windows) and less blocking when using the multi
                     interface. (added in 7.10.7)

              CURL_VERSION_SPNEGO
                     libcurl  was  built  with  support  for  SPNEGO  authentication  (Simple and
                     Protected GSS-API Negotiation Mechanism, defined in  RFC  2478.)  (added  in
                     7.10.8)

              CURL_VERSION_LARGEFILE
                     libcurl was built with support for large files. (Added in 7.11.1)

              CURL_VERSION_IDN
                     libcurl  was  built  with  support for IDNA, domain names with international
                     letters. (Added in 7.12.0)

              CURL_VERSION_SSPI
                     libcurl was built with support for SSPI. This is only available  on  Windows
                     and  makes libcurl use Windows-provided functions for Kerberos, NTLM, SPNEGO
                     and Digest authentication. It also allows libcurl to use  the  current  user
                     credentials without the app having to pass them on. (Added in 7.13.2)

              CURL_VERSION_GSSAPI
                     libcurl  was built with support for GSS-API. This makes libcurl use provided
                     functions for Kerberos and SPNEGO authentication. It also allows libcurl  to
                     use  the  current  user  credentials without the app having to pass them on.
                     (Added in 7.38.0)

              CURL_VERSION_CONV
                     libcurl was built with support for character conversions, as provided by the
                     CURLOPT_CONV_* callbacks. (Added in 7.15.4)

              CURL_VERSION_TLSAUTH_SRP
                     libcurl was built with support for TLS-SRP. (Added in 7.21.4)

              CURL_VERSION_NTLM_WB
                     libcurl  was  built  with  support  for NTLM delegation to a winbind helper.
                     (Added in 7.22.0)

              CURL_VERSION_HTTP2
                     libcurl was built with support for HTTP2.  (Added in 7.33.0)

              CURL_VERSION_UNIX_SOCKETS
                     libcurl was built with support for Unix domain sockets.  (Added in 7.40.0)

              CURL_VERSION_PSL
                     libcurl was built with support for Mozilla's Public Suffix List. This  makes
                     libcurl ignore cookies with a domain that's on the list.  (Added in 7.47.0)

              CURL_VERSION_HTTPS_PROXY
                     libcurl was built with support for HTTPS-proxy.  (Added in 7.52.0)

              CURL_VERSION_MULTI_SSL
                     libcurl   was   built   with   multiple   SSL  backends.  For  details,  see
                     curl_global_sslset(3).  (Added in 7.56.0)

              CURL_VERSION_BROTLI
                     supports HTTP Brotli content encoding using libbrotlidec (Added in 7.57.0)
       ssl_version is an ASCII string for the TLS library name + version used. If libcurl has  no
       SSL support, this is NULL. For example "Schannel", "SecureTransport" or "OpenSSL/1.1.0g".

       ssl_version_num is always 0.

       libz_version  is  an  ASCII string (there is no numerical version). If libcurl has no libz
       support, this is NULL.

       protocols is a pointer to an array of char * pointers, containing the names protocols that
       libcurl  supports  (using  lowercase letters). The protocol names are the same as would be
       used in URLs. The array is terminated by a NULL entry.

RETURN VALUE

       A pointer to a curl_version_info_data struct.

SEE ALSO

       curl_version(3)