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curl_version_info(3) libcurl curl_version_info(3)
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 pro-
gram. This way, libcurl always returns a proper struct that your pro-
gram 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 possi-
ble 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. */
} 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 termi-
nated 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 Win-
dows) 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 Suf-
fix 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-pro-
vided 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 capabili-
ties. 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. Depre-
cated 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 ter-
minated 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)
libcurl 8.4.0 September 27, 2023 curl_version_info(3)
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