Ubuntu Manpage: curl_version_info - returns runtime libcurl version info

Provided by: libcurl4-doc_8.9.1-2ubuntu2.2_all

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 always returns a proper struct that your program understands, while programs
       in the future might get a different struct. CURLVERSION_NOW is 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(3) 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. */
         /* when 'age' is CURLVERSION_TWELFTH or higher (>= 8.8.0), the members
            below exist */
         const char *const *rtmp_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 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. See the list of features names below.

       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.

FEATURES

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)

ECH features mask bit: non-existent

libcurl was built with ECH support (experimental, added in 8.8.0)

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) This
feature was removed from curl in 8.8.0.

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)

no name
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, deprecated.)

no name
features mask bit: CURL_VERSION_GSSNEGOTIATE

supports HTTP GSS-Negotiate (added in 7.10.6, deprecated in 7.38.0)

no name
features mask bit: CURL_VERSION_KERBEROS4

supports Kerberos V4 (when using FTP). Legacy bit. Deprecated since 7.33.0.

PROTOCOLS

       This functionality affects all supported protocols

EXAMPLE

       int main(void)
       {
         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 curl 7.10.0

RETURN VALUE

       A pointer to a curl_version_info_data struct.