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curl_version_info(3) Library Functions Manual 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 vari- ous features in the running version of libcurl. The input argument age has no use and we recommend you set it to CURLVERSION_NOW. This function may 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. That number is different de- pending on how recent your libcurl is. The documentation above describes which struct fields that were added at which age. Trying to access a struct field that is newer than the age of your struct may cause undefined behav- ior and possibly crashes. version is 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 environ- ment. 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 fea- ture_names instead. The feature names description below lists the associ- ated 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". For MultiSSL builds the string contains all SSL backend names and the inactive backend names are in parentheses. For example "(OpenSSL/3.0.8) Schannel" or "OpenSSL/3.0.8 (Schannel)". 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-svcfeatures mask bit: CURL_VERSION_ALTSVC HTTP Alt-Svc parsing and the associated options (Added in 7.64.1) AppleSecTrust features mask bit: non-existent libcurl was built with support for Apple's SecTrust service to ver- ify server certificates (Added in 8.17.0). 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. brotli features mask bit: CURL_VERSION_BROTLI supports HTTP Brotli content encoding using libbrotlidec asyn-rrfeatures mask bit: non-existent libcurl was built to use c-ares for EXPERIMENTAL HTTPS resource record resolves, but uses the threaded resolver for "normal" re- solves (Added in 8.12.0) Debug features mask bit: CURL_VERSION_DEBUG libcurl was built with debug capabilities 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-APIfeatures 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. HSTS features mask bit: CURL_VERSION_HSTS libcurl was built with support for HSTS (HTTP Strict Transport Secu- rity) (Added in 7.74.0) HTTP2 features mask bit: CURL_VERSION_HTTP2 libcurl was built with support for HTTP2. 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. HTTPSRRfeatures mask bit: non-existent libcurl was built with EXPERIMENTAL support for HTTPS resource records (Added in 8.12.0) IDN features mask bit: CURL_VERSION_IDN libcurl was built with support for IDNA, domain names with interna- tional letters. 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. Largefile features mask bit: CURL_VERSION_LARGEFILE libcurl was built with support for large files. libz features mask bit: CURL_VERSION_LIBZ supports HTTP deflate using libz MultiSSL features mask bit: CURL_VERSION_MULTI_SSL libcurl was built with multiple SSL backends. For details, see curl_global_sslset(3). NativeCA features mask bit: non-existent libcurl was built to enable native CA store, to verify server cer- tificates (Added in 8.19.0). NTLM features mask bit: CURL_VERSION_NTLM supports HTTP NTLM NTLM_WBfeatures mask bit: CURL_VERSION_NTLM_WB libcurl was built with support for NTLM delegation to a winbind helper. 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. 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.) SSL features mask bit: CURL_VERSION_SSL supports SSL (HTTPS/FTPS) SSLS-EXPORT features mask bit: non-existent libcurl was built with SSL session import/export support (experimen- tal, added in 8.12.0) 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 Ker- beros, NTLM, SPNEGO and Digest authentication. It also allows libcurl to use the current user credentials without the app having to pass them on. 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-SRPfeatures mask bit: CURL_VERSION_TLSAUTH_SRP libcurl was built with support for TLS-SRP (in one or more of the built-in TLS backends). Unicodefeatures 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. zstd features mask bit: CURL_VERSION_ZSTD supports HTTP zstd content encoding using zstd library (Added in 7.72.0) no namefeatures mask bit: CURL_VERSION_CONV libcurl was built with support for character conversions provided by callbacks. Always 0 since 7.82.0. Deprecated. no namefeatures mask bit: CURL_VERSION_CURLDEBUG libcurl was built with memory tracking debug capabilities. This is mainly of interest for libcurl hackers. Always the same as CURL_VER- SION_DEBUG since 8.19.0. Deprecated. no namefeatures mask bit: CURL_VERSION_GSSNEGOTIATE supports HTTP GSS-Negotiate. Deprecated. no namefeatures 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 RETURN VALUE A pointer to a curl_version_info_data struct. SEE ALSO curl_version(3) libcurl 2026-06-11 curl_version_info(3)
NAME | SYNOPSIS | DESCRIPTION | FEATURES | PROTOCOLS | EXAMPLE | AVAILABILITY | RETURN VALUE | SEE ALSO
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