Provided by: libcurl4-doc_7.88.1-8ubuntu1_all bug

NAME

       curl_version_info - returns runtime 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.

       This  function can alter the returned static data as long as curl_global_init has not been
       called. It is therefore not thread-safe before libcurl initialization occurs.

       The curl_version_info_data struct looks like this

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

         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 CURLVERSION_SECOND or higher, the members below exist */
         const char *ares;         /* human readable string */
         int ares_num;             /* number */

         /* when 'age' is CURLVERSION_THIRD or higher, the members below exist */
         const char *libidn;       /* human readable string */

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

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

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

         /* when 'age' is CURLVERSION_SIXTH or higher (>= 7.66.0), the members
            below exist */
         unsigned int nghttp2_ver_num; /* Numeric nghttp2 version
                                          (MAJOR << 16) | (MINOR << 8) | PATCH */
         const char *nghttp2_version; /* human readable string. */

         const char *quic_version;    /* human readable quic (+ HTTP/3) library +
                                         version or NULL */

         /* when 'age' is CURLVERSION_SEVENTH or higher (>= 7.70.0), the members
            below exist */
         const char *cainfo;          /* the built-in default CURLOPT_CAINFO, might
                                         be NULL */
         const char *capath;          /* the built-in default CURLOPT_CAPATH, might
                                         be NULL */
         /* when 'age' is CURLVERSION_EIGHTH or higher (>= 7.71.0), the members
            below exist */
         unsigned int zstd_ver_num; /* Numeric Zstd version
                                         (MAJOR << 24) | (MINOR << 12) | PATCH */
         const char *zstd_version; /* human readable string. */
         /* when 'age' is CURLVERSION_NINTH or higher (>= 7.75.0), the members
            below exist */
         const char *hyper_version; /* human readable string. */
         /* when 'age' is CURLVERSION_TENTH or higher (>= 7.77.0), the members
            below exist */
         const char *gsasl_version; /* human readable string. */
         /* when 'age' is CURLVERSION_ELEVENTH or higher (>= 7.87.0), the members
            below exist */
         const char *const *feature_names; /* Feature names. */
       } curl_version_info_data;

       age describes what the age of this struct is. The number depends on how  new  the  libcurl
       you  are  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 is a bit mask representing available features. It can have none, one or more bits
       set.   The  use of this field is deprecated: use feature_names instead.  The feature names
       description below lists the associated bits.

       feature_names is a pointer to an array of string pointers, containing  the  names  of  the
       features that libcurl supports. The array is terminated by a NULL entry. Currently defined
       names are:

              "alt-svc"
                     features mask bit: CURL_VERSION_ALTSVC
                     HTTP Alt-Svc parsing and the associated options (Added in 7.64.1)

              "AsynchDNS"
                     features mask bit: 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)

              "brotli"
                     features mask bit: CURL_VERSION_BROTLI
                     supports HTTP Brotli content encoding using libbrotlidec (Added in 7.57.0)

              "Debug"
                     features mask bit: CURL_VERSION_DEBUG
                     libcurl was built with debug capabilities (added in 7.10.6)

              "gsasl"
                     features mask bit: CURL_VERSION_GSASL
                     libcurl  was  built  with  libgsasl  and  thus  with  some  extra  SCRAM-SHA
                     authentication methods. (added in 7.76.0)

              "GSS-API"
                     features mask bit: 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)

              "HSTS" features mask bit: CURL_VERSION_HSTS
                     libcurl was built with support for HSTS  (HTTP  Strict  Transport  Security)
                     (Added in 7.74.0)

              "HTTP2"
                     features mask bit: CURL_VERSION_HTTP2
                     libcurl was built with support for HTTP2.  (Added in 7.33.0)

              "HTTP3"
                     features mask bit: CURL_VERSION_HTTP3
                     HTTP/3 and QUIC support are built-in (Added in 7.66.0)

              "HTTPS-proxy"
                     features mask bit: CURL_VERSION_HTTPS_PROXY
                     libcurl was built with support for HTTPS-proxy.  (Added in 7.52.0)

              "IDN"  features mask bit: CURL_VERSION_IDN
                     libcurl  was  built  with  support for IDNA, domain names with international
                     letters. (Added in 7.12.0)

              "IPv6" features mask bit: CURL_VERSION_IPV6
                     supports IPv6

              "Kerberos"
                     features mask bit: CURL_VERSION_KERBEROS5
                     supports Kerberos V5 authentication for FTP,  IMAP,  LDAP,  POP3,  SMTP  and
                     SOCKSv5 proxy. (Added in 7.40.0)

              "Largefile"
                     features mask bit: CURL_VERSION_LARGEFILE
                     libcurl was built with support for large files. (Added in 7.11.1)

              "libz" features mask bit: CURL_VERSION_LIBZ
                     supports HTTP deflate using libz (Added in 7.10)

              "MultiSSL"
                     features mask bit: CURL_VERSION_MULTI_SSL
                     libcurl   was   built   with   multiple   SSL  backends.  For  details,  see
                     curl_global_sslset(3).  (Added in 7.56.0)

              "NTLM" features mask bit: CURL_VERSION_NTLM
                     supports HTTP NTLM (added in 7.10.6)

              "NTLM_WB"
                     features mask bit: CURL_VERSION_NTLM_WB
                     libcurl was built with support for NTLM  delegation  to  a  winbind  helper.
                     (Added in 7.22.0)

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

              "SPNEGO"
                     features mask bit: 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)

              "SSL"  features mask bit: CURL_VERSION_SSL
                     supports SSL (HTTPS/FTPS) (Added in 7.10)

              "SSPI" features mask bit: 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)

              "threadsafe"
                     features mask bit: CURL_VERSION_THREADSAFE
                     libcurl  was built with thread-safety support (Atomic or SRWLOCK) to protect
                     curl initialization. (Added in 7.84.0) See libcurl-thread(3)

              "TLS-SRP"
                     features mask bit: CURL_VERSION_TLSAUTH_SRP
                     libcurl was built with support for TLS-SRP (in one or more of  the  built-in
                     TLS backends). (Added in 7.21.4)

              "TrackMemory"
                     features mask bit: CURL_VERSION_CURLDEBUG
                     libcurl was built with memory tracking debug capabilities. This is mainly of
                     interest for libcurl hackers. (added in 7.19.6)

              "Unicode"
                     features mask bit: CURL_VERSION_UNICODE
                     libcurl was built with Unicode support  on  Windows.  This  makes  non-ASCII
                     characters  work  in  filenames  and  options  passed  to libcurl. (Added in
                     7.72.0)

              "UnixSockets"
                     features mask bit: CURL_VERSION_UNIX_SOCKETS
                     libcurl was built with support for Unix domain sockets.  (Added in 7.40.0)

              "zstd" features mask bit: CURL_VERSION_ZSTD
                     supports HTTP zstd content encoding using zstd library (Added in 7.72.0)

              none   features mask bit: CURL_VERSION_CONV
                     libcurl was built with support for character conversions, as provided by the
                     CURLOPT_CONV_* callbacks. Always 0 since 7.82.0. (Added in 7.15.4)

              none   features mask bit: CURL_VERSION_GSSNEGOTIATE
                     supports HTTP GSS-Negotiate (added in 7.10.6, deprecated in 7.38.0)

              none   features mask bit: CURL_VERSION_KERBEROS4
                     supports Kerberos V4 (when using FTP). Legacy bit. Deprecated since 7.33.0.

       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", "Secure Transport" 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.

EXAMPLE

       curl_version_info_data *ver = curl_version_info(CURLVERSION_NOW);
       printf("libcurl version %u.%u.%u\n",
              (ver->version_num >> 16) & 0xff,
              (ver->version_num >> 8) & 0xff,
              ver->version_num & 0xff);

AVAILABILITY

       Added in 7.10

RETURN VALUE

       A pointer to a curl_version_info_data struct.

SEE ALSO

       curl_version(3)