## NAME

curl_version_info - returns run-time libcurl version info

## SYNOPSIS

#include <curl/curl.h>

curl_version_info_data *curl_version_info( CURLversion type );

## DESCRIPTION

Returns a pointer to a filled in struct with information about various run-time features in libcurl. type 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 an 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.

The curl_version_info_data struct looks like this

    typedef struct {
       CURLversion age;          /* see description below */
       /* when 'age' is 0 or higher, the members below also exist: */
       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 **protocols;   /* list of protocols */
       /* when 'age' is 1 or higher, the members below also exist: */
       const char *ares;         /* human readable string */
       int ares_num;             /* number */
       /* when 'age' is 2 or higher, the member below also exists: */
       const char *libidn;       /* human readable string */
     } curl_version_info_data;
     age describes what age of this struct this is. The number depends on how
     new libcurl you're using. 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 can have none, one or more bits set, and the currently defined
     bits are:
     CURL_VERSION_IPV6 supports IPv6
     CURL_VERSION_KERBEROS4 supports kerberos4 (when using FTP)
     CURL_VERSION_SSL supports SSL (HTTPS/FTPS) (Added in 7.10)
     CURL_VERSION_LIBZ supports HTTP deflate using libz (Added in 7.10)
     CURL_VERSION_NTLM supports HTTP NTLM (added in 7.10.6)
     CURL_VERSION_GSSNEGOTIATE supports HTTP GSS-Negotiate (added in 7.10.6)
     CURL_VERSION_DEBUG libcurl was built with extra debug capabilities built-in. This is mainly of
     interest for libcurl hackers. (added in 7.10.6)
     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)
     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)
     CURL_VERSION_LARGEFILE libcurl was built with support for large files. (Added in 7.11.1)
     CURL_VERSION_IDN libcurl was built with support for IDNA, domain names with international
     letters. (Added in 7.12.0)
     CURL_VERSION_SSPI libcurl was built with support for SSPI. This is only available on Windows and
     makes libcurl use Windows-provided functions for NTLM authentication. It also
     allows libcurl to use the current user and the current user's password without
     the app having to pass them on. (Added in 7.13.2)
     ssl_version is an ascii string for the OpenSSL version used. If libcurl
     has no SSL support, this is NULL.
     ssl_version_num is the numerical OpenSSL version value as defined by the
     OpenSSL project. If libcurl has no SSL support, this is 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.

## RETURN VALUE

A pointer to a curl_version_info_data struct.

## SEE ALSO

curl_version(3)

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