1curl_version_info(3) libcurl Manual curl_version_info(3)
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6 curl_version_info - returns runtime libcurl version info
7
9 #include <curl/curl.h>
10 curl_version_info_data *curl_version_info( CURLversion age);
12
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 data = curl_version_info(CURLVERSION_NOW);
22 Applications should use this information to judge if things are possi‐
23 ble to do or not, instead of using compile-time checks, as dynamic/DLL
24 libraries can be changed independent of applications.
25 This function can alter the returned static data as long as
27 curl_global_init has not been called. It is therefore not thread-safe
28 before libcurl initialization occurs.
29 The curl_version_info_data struct looks like this
31 typedef struct {
33 CURLversion age; /* see description below */
34 const char *version; /* human readable string */
36 unsigned int version_num; /* numeric representation */
37 const char *host; /* human readable string */
38 int features; /* bitmask, see below */
39 char *ssl_version; /* human readable string */
40 long ssl_version_num; /* not used, always zero */
41 const char *libz_version; /* human readable string */
42 const char *const *protocols; /* protocols */
43 /* when 'age' is CURLVERSION_SECOND or higher, the members below exist */
45 const char *ares; /* human readable string */
46 int ares_num; /* number */
47 /* when 'age' is CURLVERSION_THIRD or higher, the members below exist */
49 const char *libidn; /* human readable string */
50 /* when 'age' is CURLVERSION_FOURTH or higher (>= 7.16.1), the members
52 below exist */
53 int iconv_ver_num; /* '_libiconv_version' if iconv support enabled */
54 const char *libssh_version; /* human readable string */
56 /* when 'age' is CURLVERSION_FIFTH or higher (>= 7.57.0), the members
58 below exist */
59 unsigned int brotli_ver_num; /* Numeric Brotli version
60 (MAJOR << 24) | (MINOR << 12) | PATCH */
61 const char *brotli_version; /* human readable string. */
62 /* when 'age' is CURLVERSION_SIXTH or higher (>= 7.66.0), the members
64 below exist */
65 unsigned int nghttp2_ver_num; /* Numeric nghttp2 version
66 (MAJOR << 16) | (MINOR << 8) | PATCH */
67 const char *nghttp2_version; /* human readable string. */
68 const char *quic_version; /* human readable quic (+ HTTP/3) library +
70 version or NULL */
71 /* when 'age' is CURLVERSION_SEVENTH or higher (>= 7.70.0), the members
73 below exist */
74 const char *cainfo; /* the built-in default CURLOPT_CAINFO, might
75 be NULL */
76 const char *capath; /* the built-in default CURLOPT_CAPATH, might
77 be NULL */
78 /* when 'age' is CURLVERSION_EIGHTH or higher (>= 7.71.0), the members
79 below exist */
80 unsigned int zstd_ver_num; /* Numeric Zstd version
81 (MAJOR << 24) | (MINOR << 12) | PATCH */
82 const char *zstd_version; /* human readable string. */
83 /* when 'age' is CURLVERSION_NINTH or higher (>= 7.75.0), the members
84 below exist */
85 const char *hyper_version; /* human readable string. */
86 /* when 'age' is CURLVERSION_TENTH or higher (>= 7.77.0), the members
87 below exist */
88 const char *gsasl_version; /* human readable string. */
89 /* when 'age' is CURLVERSION_ELEVENTH or higher (>= 7.87.0), the members
90 below exist */
91 const char *const *feature_names; /* Feature names. */
92 } curl_version_info_data;
93 age describes what the age of this struct is. The number depends on how
95 new the libcurl you are using is. You are however guaranteed to get a
96 struct that you have a matching struct for in the header, as you tell
97 libcurl your "age" with the input argument.
98 version is just an ascii string for the libcurl version.
100 version_num is a 24 bit number created like this: <8 bits major number>
102 | <8 bits minor number> | <8 bits patch number>. Version 7.9.8 is
103 therefore returned as 0x070908.
104 host is an ascii string showing what host information that this libcurl
106 was built for. As discovered by a configure script or set by the build
107 environment.
108 features is a bit mask representing available features. It can have
110 none, one or more bits set. The use of this field is deprecated: use
111 feature_names instead. The feature names description below lists the
112 associated bits.
113 feature_names is a pointer to an array of string pointers, containing
115 the names of the features that libcurl supports. The array is termi‐
116 nated by a NULL entry. Currently defined names are:
117 "alt-svc"
119 features mask bit: CURL_VERSION_ALTSVC
120 HTTP Alt-Svc parsing and the associated options (Added in
121 7.64.1)
122 "AsynchDNS"
124 features mask bit: CURL_VERSION_ASYNCHDNS
125 libcurl was built with support for asynchronous name
126 lookups, which allows more exact timeouts (even on Win‐
127 dows) and less blocking when using the multi interface.
128 (added in 7.10.7)
129 "brotli"
131 features mask bit: CURL_VERSION_BROTLI
132 supports HTTP Brotli content encoding using libbrotlidec
133 (Added in 7.57.0)
134 "Debug"
136 features mask bit: CURL_VERSION_DEBUG
137 libcurl was built with debug capabilities (added in
138 7.10.6)
139 "gsasl"
141 features mask bit: CURL_VERSION_GSASL
142 libcurl was built with libgsasl and thus with some extra
143 SCRAM-SHA authentication methods. (added in 7.76.0)
144 "GSS-API"
146 features mask bit: CURL_VERSION_GSSAPI
147 libcurl was built with support for GSS-API. This makes
148 libcurl use provided functions for Kerberos and SPNEGO
149 authentication. It also allows libcurl to use the current
150 user credentials without the app having to pass them on.
151 (Added in 7.38.0)
152 "HSTS" features mask bit: CURL_VERSION_HSTS
154 libcurl was built with support for HSTS (HTTP Strict
155 Transport Security) (Added in 7.74.0)
156 "HTTP2"
158 features mask bit: CURL_VERSION_HTTP2
159 libcurl was built with support for HTTP2. (Added in
160 7.33.0)
161 "HTTP3"
163 features mask bit: CURL_VERSION_HTTP3
164 HTTP/3 and QUIC support are built-in (Added in 7.66.0)
165 "HTTPS-proxy"
167 features mask bit: CURL_VERSION_HTTPS_PROXY
168 libcurl was built with support for HTTPS-proxy. (Added
169 in 7.52.0)
170 "IDN" features mask bit: CURL_VERSION_IDN
172 libcurl was built with support for IDNA, domain names
173 with international letters. (Added in 7.12.0)
174 "IPv6" features mask bit: CURL_VERSION_IPV6
176 supports IPv6
177 "Kerberos"
179 features mask bit: CURL_VERSION_KERBEROS5
180 supports Kerberos V5 authentication for FTP, IMAP, LDAP,
181 POP3, SMTP and SOCKSv5 proxy. (Added in 7.40.0)
182 "Largefile"
184 features mask bit: CURL_VERSION_LARGEFILE
185 libcurl was built with support for large files. (Added in
186 7.11.1)
187 "libz" features mask bit: CURL_VERSION_LIBZ
189 supports HTTP deflate using libz (Added in 7.10)
190 "MultiSSL"
192 features mask bit: CURL_VERSION_MULTI_SSL
193 libcurl was built with multiple SSL backends. For de‐
194 tails, see curl_global_sslset(3). (Added in 7.56.0)
195 "NTLM" features mask bit: CURL_VERSION_NTLM
197 supports HTTP NTLM (added in 7.10.6)
198 "NTLM_WB"
200 features mask bit: CURL_VERSION_NTLM_WB
201 libcurl was built with support for NTLM delegation to a
202 winbind helper. (Added in 7.22.0)
203 "PSL" features mask bit: CURL_VERSION_PSL
205 libcurl was built with support for Mozilla's Public Suf‐
206 fix List. This makes libcurl ignore cookies with a domain
207 that is on the list. (Added in 7.47.0)
208 "SPNEGO"
210 features mask bit: CURL_VERSION_SPNEGO
211 libcurl was built with support for SPNEGO authentication
212 (Simple and Protected GSS-API Negotiation Mechanism, de‐
213 fined in RFC 2478.) (added in 7.10.8)
214 "SSL" features mask bit: CURL_VERSION_SSL
216 supports SSL (HTTPS/FTPS) (Added in 7.10)
217 "SSPI" features mask bit: CURL_VERSION_SSPI
219 libcurl was built with support for SSPI. This is only
220 available on Windows and makes libcurl use Windows-pro‐
221 vided functions for Kerberos, NTLM, SPNEGO and Digest au‐
222 thentication. It also allows libcurl to use the current
223 user credentials without the app having to pass them on.
224 (Added in 7.13.2)
225 "threadsafe"
227 features mask bit: CURL_VERSION_THREADSAFE
228 libcurl was built with thread-safety support (Atomic or
229 SRWLOCK) to protect curl initialization. (Added in
230 7.84.0) See libcurl-thread(3)
231 "TLS-SRP"
233 features mask bit: CURL_VERSION_TLSAUTH_SRP
234 libcurl was built with support for TLS-SRP (in one or
235 more of the built-in TLS backends). (Added in 7.21.4)
236 "TrackMemory"
238 features mask bit: CURL_VERSION_CURLDEBUG
239 libcurl was built with memory tracking debug capabili‐
240 ties. This is mainly of interest for libcurl hackers.
241 (added in 7.19.6)
242 "Unicode"
244 features mask bit: CURL_VERSION_UNICODE
245 libcurl was built with Unicode support on Windows. This
246 makes non-ASCII characters work in filenames and options
247 passed to libcurl. (Added in 7.72.0)
248 "UnixSockets"
250 features mask bit: CURL_VERSION_UNIX_SOCKETS
251 libcurl was built with support for Unix domain sockets.
252 (Added in 7.40.0)
253 "zstd" features mask bit: CURL_VERSION_ZSTD
255 supports HTTP zstd content encoding using zstd library
256 (Added in 7.72.0)
257 none features mask bit: CURL_VERSION_CONV
259 libcurl was built with support for character conversions,
260 as provided by the CURLOPT_CONV_* callbacks. Always 0
261 since 7.82.0. (Added in 7.15.4)
262 none features mask bit: CURL_VERSION_GSSNEGOTIATE
264 supports HTTP GSS-Negotiate (added in 7.10.6, deprecated
265 in 7.38.0)
266 none features mask bit: CURL_VERSION_KERBEROS4
268 supports Kerberos V4 (when using FTP). Legacy bit. Depre‐
269 cated since 7.33.0.
270 ssl_version is an ASCII string for the TLS library name + version used.
272 If libcurl has no SSL support, this is NULL. For example "Schannel",
273 "Secure Transport" or "OpenSSL/1.1.0g".
274 ssl_version_num is always 0.
276 libz_version is an ASCII string (there is no numerical version). If
278 libcurl has no libz support, this is NULL.
279 protocols is a pointer to an array of char * pointers, containing the
281 names protocols that libcurl supports (using lowercase letters). The
282 protocol names are the same as would be used in URLs. The array is ter‐
283 minated by a NULL entry.
284
286 curl_version_info_data *ver = curl_version_info(CURLVERSION_NOW);
287 printf("libcurl version %u.%u.%u\n",
288 (ver->version_num >> 16) & 0xff,
289 (ver->version_num >> 8) & 0xff,
290 ver->version_num & 0xff);
291
293 Added in 7.10
294
296 A pointer to a curl_version_info_data struct.
297
299 curl_version(3)
300libcurl 8.0.1 January 16, 2023 curl_version_info(3)