417 lines
12 KiB
Markdown
417 lines
12 KiB
Markdown
---
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c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
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SPDX-License-Identifier: curl
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Title: curl_version_info
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Section: 3
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Source: libcurl
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See-also:
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- curl_version (3)
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Protocol:
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- All
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Added-in: 7.10
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---
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# NAME
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curl_version_info - returns runtime libcurl version info
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# SYNOPSIS
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~~~c
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#include <curl/curl.h>
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curl_version_info_data *curl_version_info(CURLversion age);
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~~~
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# DESCRIPTION
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Returns a pointer to a filled in static struct with information about various
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features in the running version of libcurl. *age* should be set to the
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version of this functionality by the time you write your program. This way,
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libcurl always returns a proper struct that your program understands, while
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programs in the future might get a different struct. **CURLVERSION_NOW** is
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the most recent one for the library you have installed:
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~~~c
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data = curl_version_info(CURLVERSION_NOW);
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~~~
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Applications should use this information to judge if things are possible to do
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or not, instead of using compile-time checks, as dynamic/DLL libraries can be
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changed independent of applications.
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This function can alter the returned static data as long as
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curl_global_init(3) has not been called. It is therefore not thread-safe
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before libcurl initialization occurs.
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The curl_version_info_data struct looks like this
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~~~c
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typedef struct {
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CURLversion age; /* see description below */
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const char *version; /* human readable string */
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unsigned int version_num; /* numeric representation */
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const char *host; /* human readable string */
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int features; /* bitmask, see below */
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char *ssl_version; /* human readable string */
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long ssl_version_num; /* not used, always zero */
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const char *libz_version; /* human readable string */
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const char *const *protocols; /* protocols */
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/* when 'age' is CURLVERSION_SECOND or higher, the members below exist */
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const char *ares; /* human readable string */
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int ares_num; /* number */
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/* when 'age' is CURLVERSION_THIRD or higher, the members below exist */
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const char *libidn; /* human readable string */
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/* when 'age' is CURLVERSION_FOURTH or higher (>= 7.16.1), the members
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below exist */
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int iconv_ver_num; /* '_libiconv_version' if iconv support enabled */
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const char *libssh_version; /* human readable string */
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/* when 'age' is CURLVERSION_FIFTH or higher (>= 7.57.0), the members
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below exist */
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unsigned int brotli_ver_num; /* Numeric Brotli version
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(MAJOR << 24) | (MINOR << 12) | PATCH */
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const char *brotli_version; /* human readable string. */
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/* when 'age' is CURLVERSION_SIXTH or higher (>= 7.66.0), the members
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below exist */
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unsigned int nghttp2_ver_num; /* Numeric nghttp2 version
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(MAJOR << 16) | (MINOR << 8) | PATCH */
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const char *nghttp2_version; /* human readable string. */
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const char *quic_version; /* human readable quic (+ HTTP/3) library +
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version or NULL */
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/* when 'age' is CURLVERSION_SEVENTH or higher (>= 7.70.0), the members
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below exist */
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const char *cainfo; /* the built-in default CURLOPT_CAINFO, might
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be NULL */
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const char *capath; /* the built-in default CURLOPT_CAPATH, might
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be NULL */
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/* when 'age' is CURLVERSION_EIGHTH or higher (>= 7.71.0), the members
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below exist */
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unsigned int zstd_ver_num; /* Numeric Zstd version
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(MAJOR << 24) | (MINOR << 12) | PATCH */
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const char *zstd_version; /* human readable string. */
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/* when 'age' is CURLVERSION_NINTH or higher (>= 7.75.0), the members
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below exist */
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const char *hyper_version; /* human readable string. */
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/* when 'age' is CURLVERSION_TENTH or higher (>= 7.77.0), the members
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below exist */
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const char *gsasl_version; /* human readable string. */
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/* when 'age' is CURLVERSION_ELEVENTH or higher (>= 7.87.0), the members
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below exist */
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const char *const *feature_names; /* Feature names. */
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/* when 'age' is CURLVERSION_TWELFTH or higher (>= 8.8.0), the members
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below exist */
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const char *const *rtmp_version; /* human readable string */
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} curl_version_info_data;
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~~~
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*age* describes what the age of this struct is. The number depends on how
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new the libcurl you are using is. You are however guaranteed to get a struct
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that you have a matching struct for in the header, as you tell libcurl your
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"age" with the input argument.
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*version* is just an ASCII string for the libcurl version.
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*version_num* is a 24 bit number created like this: \<8 bits major number\> |
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\<8 bits minor number\> | \<8 bits patch number\>. Version 7.9.8 is therefore
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returned as 0x070908.
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*host* is an ASCII string showing what host information that this libcurl
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was built for. As discovered by a configure script or set by the build
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environment.
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*features* is a bit mask representing available features. It can have none,
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one or more bits set. The use of this field is deprecated: use
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*feature_names* instead. The feature names description below lists the
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associated bits.
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*feature_names* is a pointer to an array of string pointers, containing the
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names of the features that libcurl supports. The array is terminated by a NULL
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entry. See the list of features names below.
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*ssl_version* is an ASCII string for the TLS library name + version used. If
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libcurl has no SSL support, this is NULL. For example "Schannel", "Secure
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Transport" or "OpenSSL/1.1.0g". For MultiSSL builds the string contains all
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SSL backend names and the inactive backend names are in parentheses. For
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example "(OpenSSL/3.0.8) Schannel" or "OpenSSL/3.0.8 (Schannel)".
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*ssl_version_num* is always 0.
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*libz_version* is an ASCII string (there is no numerical version). If
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libcurl has no libz support, this is NULL.
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*protocols* is a pointer to an array of char * pointers, containing the
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names protocols that libcurl supports (using lowercase letters). The protocol
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names are the same as would be used in URLs. The array is terminated by a NULL
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entry.
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# FEATURES
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## `alt-svc`
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*features* mask bit: CURL_VERSION_ALTSVC
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HTTP Alt-Svc parsing and the associated options (Added in 7.64.1)
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## `AppleSecTrust`
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*features* mask bit: non-existent
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libcurl was built with support for Apple's SecTrust service to verify
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server certificates (Added in 8.17.0).
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## `AsynchDNS`
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*features* mask bit: CURL_VERSION_ASYNCHDNS
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libcurl was built with support for asynchronous name lookups, which allows
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more exact timeouts (even on Windows) and less blocking when using the multi
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interface.
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## `brotli`
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*features* mask bit: CURL_VERSION_BROTLI
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supports HTTP Brotli content encoding using libbrotlidec
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## `asyn-rr`
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*features* mask bit: non-existent
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libcurl was built to use c-ares for EXPERIMENTAL HTTPS resource record
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resolves, but uses the threaded resolver for "normal" resolves (Added in
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8.12.0)
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## `Debug`
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*features* mask bit: CURL_VERSION_DEBUG
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libcurl was built with debug capabilities
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## `ECH`
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*features* mask bit: non-existent
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libcurl was built with ECH support (experimental, added in 8.8.0)
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## `gsasl`
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*features* mask bit: CURL_VERSION_GSASL
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libcurl was built with libgsasl and thus with some extra SCRAM-SHA
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authentication methods. (added in 7.76.0)
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## `GSS-API`
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*features* mask bit: CURL_VERSION_GSSAPI
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libcurl was built with support for GSS-API. This makes libcurl use provided
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functions for Kerberos and SPNEGO authentication. It also allows libcurl
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to use the current user credentials without the app having to pass them on.
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## `HSTS`
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*features* mask bit: CURL_VERSION_HSTS
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libcurl was built with support for HSTS (HTTP Strict Transport Security)
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(Added in 7.74.0)
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## `HTTP2`
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*features* mask bit: CURL_VERSION_HTTP2
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libcurl was built with support for HTTP2.
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## `HTTP3`
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*features* mask bit: CURL_VERSION_HTTP3
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HTTP/3 and QUIC support are built-in (Added in 7.66.0)
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## `HTTPS-proxy`
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*features* mask bit: CURL_VERSION_HTTPS_PROXY
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libcurl was built with support for HTTPS-proxy.
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## `HTTPSRR`
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*features* mask bit: non-existent
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libcurl was built with EXPERIMENTAL support for HTTPS resource records (Added
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in 8.12.0)
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## `IDN`
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*features* mask bit: CURL_VERSION_IDN
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libcurl was built with support for IDNA, domain names with international
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letters.
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## `IPv6`
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*features* mask bit: CURL_VERSION_IPV6
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supports IPv6
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## `Kerberos`
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*features* mask bit: CURL_VERSION_KERBEROS5
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supports Kerberos V5 authentication for FTP, IMAP, LDAP, POP3, SMTP and
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SOCKSv5 proxy.
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## `Largefile`
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*features* mask bit: CURL_VERSION_LARGEFILE
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libcurl was built with support for large files.
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## `libz`
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*features* mask bit: CURL_VERSION_LIBZ
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supports HTTP deflate using libz
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## `MultiSSL`
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*features* mask bit: CURL_VERSION_MULTI_SSL
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libcurl was built with multiple SSL backends. For details, see
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curl_global_sslset(3).
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## `NTLM`
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*features* mask bit: CURL_VERSION_NTLM
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supports HTTP NTLM
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## `NTLM_WB`
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*features* mask bit: CURL_VERSION_NTLM_WB
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libcurl was built with support for NTLM delegation to a winbind helper. This
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feature was removed from curl in 8.8.0.
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## `PSL`
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*features* mask bit: CURL_VERSION_PSL
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libcurl was built with support for Mozilla's Public Suffix List. This makes
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libcurl ignore cookies with a domain that is on the list.
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## `SPNEGO`
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*features* mask bit: CURL_VERSION_SPNEGO
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libcurl was built with support for SPNEGO authentication (Simple and Protected
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GSS-API Negotiation Mechanism, defined in RFC 2478.)
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## `SSL`
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*features* mask bit: CURL_VERSION_SSL
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supports SSL (HTTPS/FTPS)
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## `SSLS-EXPORT`
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*features* mask bit: non-existent
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libcurl was built with SSL session import/export support
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(experimental, added in 8.12.0)
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## `SSPI`
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*features* mask bit: CURL_VERSION_SSPI
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libcurl was built with support for SSPI. This is only available on Windows and
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makes libcurl use Windows-provided functions for Kerberos, NTLM, SPNEGO and
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Digest authentication. It also allows libcurl to use the current user
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credentials without the app having to pass them on.
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## `threadsafe`
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*features* mask bit: CURL_VERSION_THREADSAFE
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libcurl was built with thread-safety support (Atomic or SRWLOCK) to protect
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curl initialization. (Added in 7.84.0) See libcurl-thread(3)
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## `TLS-SRP`
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*features* mask bit: CURL_VERSION_TLSAUTH_SRP
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libcurl was built with support for TLS-SRP (in one or more of the built-in TLS
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backends).
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## `TrackMemory`
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*features* mask bit: CURL_VERSION_CURLDEBUG
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libcurl was built with memory tracking debug capabilities. This is mainly of
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interest for libcurl hackers.
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## `Unicode`
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*features* mask bit: CURL_VERSION_UNICODE
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libcurl was built with Unicode support on Windows. This makes non-ASCII
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characters work in filenames and options passed to libcurl. (Added in 7.72.0)
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## `UnixSockets`
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*features* mask bit: CURL_VERSION_UNIX_SOCKETS
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libcurl was built with support for Unix domain sockets.
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## `zstd`
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*features* mask bit: CURL_VERSION_ZSTD
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supports HTTP zstd content encoding using zstd library (Added in 7.72.0)
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## no name
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*features* mask bit: CURL_VERSION_CONV
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libcurl was built with support for character conversions provided by
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callbacks. Always 0 since 7.82.0. Deprecated.
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## no name
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*features* mask bit: CURL_VERSION_GSSNEGOTIATE
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supports HTTP GSS-Negotiate. Deprecated.
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## no name
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*features* mask bit: CURL_VERSION_KERBEROS4
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supports Kerberos V4 (when using FTP). Legacy bit. Deprecated since 7.33.0.
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# %PROTOCOLS%
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# EXAMPLE
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~~~c
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int main(void)
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{
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curl_version_info_data *ver = curl_version_info(CURLVERSION_NOW);
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printf("libcurl version %u.%u.%u\n",
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(ver->version_num >> 16) & 0xff,
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(ver->version_num >> 8) & 0xff,
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ver->version_num & 0xff);
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}
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~~~
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# %AVAILABILITY%
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# RETURN VALUE
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A pointer to a curl_version_info_data struct.
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