1curl_version_info(3)            libcurl Manual            curl_version_info(3)
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NAME

6       curl_version_info - returns run-time libcurl version info
7

SYNOPSIS

9       #include <curl/curl.h>
10
11       curl_version_info_data *curl_version_info( CURLversion age);
12

DESCRIPTION

14       Returns  a  pointer to a filled in static struct with information about
15       various features in the running version of libcurl. age should  be  set
16       to  the  version  of this functionality by the time you write your pro‐
17       gram. This way, libcurl will always return a proper  struct  that  your
18       program understands, while programs in the future might get a different
19       struct. CURLVERSION_NOW will be the most recent one for the library you
20       have installed:
21
22               data = curl_version_info(CURLVERSION_NOW);
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24       Applications  should use this information to judge if things are possi‐
25       ble to do or not, instead of using compile-time checks, as  dynamic/DLL
26       libraries can be changed independent of applications.
27
28       The curl_version_info_data struct looks like this
29
30       typedef struct {
31         CURLversion age;          /* see description below */
32
33         /* when 'age' is 0 or higher, the members below also exist: */
34         const char *version;      /* human readable string */
35         unsigned int version_num; /* numeric representation */
36         const char *host;         /* human readable string */
37         int features;             /* bitmask, see below */
38         char *ssl_version;        /* human readable string */
39         long ssl_version_num;     /* not used, always zero */
40         const char *libz_version; /* human readable string */
41         const char * const *protocols; /* protocols */
42
43         /* when 'age' is 1 or higher, the members below also exist: */
44         const char *ares;         /* human readable string */
45         int ares_num;             /* number */
46
47         /* when 'age' is 2 or higher, the member below also exists: */
48         const char *libidn;       /* human readable string */
49
50         /* when 'age' is 3 or higher (7.16.1 or later), the members below also
51            exist  */
52         int iconv_ver_num;       /* '_libiconv_version' if iconv support enabled */
53
54         const char *libssh_version; /* human readable string */
55
56         /* when 'age' is 4 or higher (7.57.0 or later), the members below also
57            exist  */
58         unsigned int brotli_ver_num; /* Numeric Brotli version
59                                         (MAJOR << 24) | (MINOR << 12) | PATCH */
60         const char *brotli_version; /* human readable string. */
61
62       } curl_version_info_data;
63
64       age describes what the age of this struct is. The number depends on how
65       new the libcurl you're using is. You are however guaranteed  to  get  a
66       struct  that  you have a matching struct for in the header, as you tell
67       libcurl your "age" with the input argument.
68
69       version is just an ascii string for the libcurl version.
70
71       version_num is a 24 bit number created like this: <8 bits major number>
72       |  <8  bits  minor  number>  |  <8 bits patch number>. Version 7.9.8 is
73       therefore returned as 0x070908.
74
75       host is an ascii string showing what host information that this libcurl
76       was  built for. As discovered by a configure script or set by the build
77       environment.
78
79       features can have none, one or more bits set, and the currently defined
80       bits are:
81
82              CURL_VERSION_IPV6
83                     supports IPv6
84
85              CURL_VERSION_KERBEROS4
86                     supports Kerberos V4 (when using FTP)
87
88              CURL_VERSION_KERBEROS5
89                     supports  Kerberos V5 authentication for FTP, IMAP, POP3,
90                     SMTP and SOCKSv5 proxy (Added in 7.40.0)
91
92              CURL_VERSION_SSL
93                     supports SSL (HTTPS/FTPS) (Added in 7.10)
94
95              CURL_VERSION_LIBZ
96                     supports HTTP deflate using libz (Added in 7.10)
97
98              CURL_VERSION_NTLM
99                     supports HTTP NTLM (added in 7.10.6)
100
101              CURL_VERSION_GSSNEGOTIATE
102                     supports HTTP GSS-Negotiate (added in 7.10.6)
103
104              CURL_VERSION_DEBUG
105                     libcurl was  built  with  debug  capabilities  (added  in
106                     7.10.6)
107
108              CURL_VERSION_CURLDEBUG
109                     libcurl  was  built  with memory tracking debug capabili‐
110                     ties. This is mainly of  interest  for  libcurl  hackers.
111                     (added in 7.19.6)
112
113              CURL_VERSION_ASYNCHDNS
114                     libcurl  was  built  with  support  for asynchronous name
115                     lookups, which allows more exact timeouts (even  on  Win‐
116                     dows)  and  less blocking when using the multi interface.
117                     (added in 7.10.7)
118
119              CURL_VERSION_SPNEGO
120                     libcurl was built with support for SPNEGO  authentication
121                     (Simple  and  Protected  GSS-API  Negotiation  Mechanism,
122                     defined in RFC 2478.) (added in 7.10.8)
123
124              CURL_VERSION_LARGEFILE
125                     libcurl was built with support for large files. (Added in
126                     7.11.1)
127
128              CURL_VERSION_IDN
129                     libcurl  was  built  with  support for IDNA, domain names
130                     with international letters. (Added in 7.12.0)
131
132              CURL_VERSION_SSPI
133                     libcurl was built with support for  SSPI.  This  is  only
134                     available  on  Windows and makes libcurl use Windows-pro‐
135                     vided functions for Kerberos,  NTLM,  SPNEGO  and  Digest
136                     authentication. It also allows libcurl to use the current
137                     user credentials without the app having to pass them  on.
138                     (Added in 7.13.2)
139
140              CURL_VERSION_GSSAPI
141                     libcurl  was  built  with support for GSS-API. This makes
142                     libcurl use provided functions for  Kerberos  and  SPNEGO
143                     authentication. It also allows libcurl to use the current
144                     user credentials without the app having to pass them  on.
145                     (Added in 7.38.0)
146
147              CURL_VERSION_CONV
148                     libcurl was built with support for character conversions,
149                     as provided by the CURLOPT_CONV_*  callbacks.  (Added  in
150                     7.15.4)
151
152              CURL_VERSION_TLSAUTH_SRP
153                     libcurl  was  built  with  support for TLS-SRP. (Added in
154                     7.21.4)
155
156              CURL_VERSION_NTLM_WB
157                     libcurl was built with support for NTLM delegation  to  a
158                     winbind helper.  (Added in 7.22.0)
159
160              CURL_VERSION_HTTP2
161                     libcurl  was  built  with  support  for HTTP2.  (Added in
162                     7.33.0)
163
164              CURL_VERSION_UNIX_SOCKETS
165                     libcurl was built with support for Unix  domain  sockets.
166                     (Added in 7.40.0)
167
168              CURL_VERSION_PSL
169                     libcurl  was built with support for Mozilla's Public Suf‐
170                     fix List. This makes libcurl ignore cookies with a domain
171                     that's on the list.  (Added in 7.47.0)
172
173              CURL_VERSION_HTTPS_PROXY
174                     libcurl  was  built with support for HTTPS-proxy.  (Added
175                     in 7.52.0)
176
177              CURL_VERSION_MULTI_SSL
178                     libcurl  was  built  with  multiple  SSL  backends.   For
179                     details, see curl_global_sslset(3).  (Added in 7.56.0)
180
181              CURL_VERSION_BROTLI
182                     supports  HTTP Brotli content encoding using libbrotlidec
183                     (Added in 7.57.0)
184       ssl_version is an ASCII string for the TLS library name + version used.
185       If  libcurl  has  no  SSL  support, this is NULL. For example "WinSSL",
186       "SecureTransport" or "OpenSSL/1.1.0g".
187
188       ssl_version_num is always 0.
189
190       libz_version is an ASCII string (there is  no  numerical  version).  If
191       libcurl has no libz support, this is NULL.
192
193       protocols  is  a pointer to an array of char * pointers, containing the
194       names protocols that libcurl supports (using  lowercase  letters).  The
195       protocol names are the same as would be used in URLs. The array is ter‐
196       minated by a NULL entry.
197

RETURN VALUE

199       A pointer to a curl_version_info_data struct.
200

SEE ALSO

202       curl_version(3)
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206
207libcurl 7.61.1                  March 17, 2018            curl_version_info(3)
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