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 The curl_version_info_data struct looks like this
27 typedef struct {
29 CURLversion age; /* see description below */
30 const char *version; /* human readable string */
32 unsigned int version_num; /* numeric representation */
33 const char *host; /* human readable string */
34 int features; /* bitmask, see below */
35 char *ssl_version; /* human readable string */
36 long ssl_version_num; /* not used, always zero */
37 const char *libz_version; /* human readable string */
38 const char *const *protocols; /* protocols */
39 /* when 'age' is CURLVERSION_SECOND or higher, the members below exist */
41 const char *ares; /* human readable string */
42 int ares_num; /* number */
43 /* when 'age' is CURLVERSION_THIRD or higher, the members below exist */
45 const char *libidn; /* human readable string */
46 /* when 'age' is CURLVERSION_FOURTH or higher (>= 7.16.1), the members
48 below exist */
49 int iconv_ver_num; /* '_libiconv_version' if iconv support enabled */
50 const char *libssh_version; /* human readable string */
52 /* when 'age' is CURLVERSION_FIFTH or higher (>= 7.57.0), the members
54 below exist */
55 unsigned int brotli_ver_num; /* Numeric Brotli version
56 (MAJOR << 24) | (MINOR << 12) | PATCH */
57 const char *brotli_version; /* human readable string. */
58 /* when 'age' is CURLVERSION_SIXTH or higher (>= 7.66.0), the members
60 below exist */
61 unsigned int nghttp2_ver_num; /* Numeric nghttp2 version
62 (MAJOR << 16) | (MINOR << 8) | PATCH */
63 const char *nghttp2_version; /* human readable string. */
64 const char *quic_version; /* human readable quic (+ HTTP/3) library +
66 version or NULL */
67 /* when 'age' is CURLVERSION_SEVENTH or higher (>= 7.70.0), the members
69 below exist */
70 const char *cainfo; /* the built-in default CURLOPT_CAINFO, might
71 be NULL */
72 const char *capath; /* the built-in default CURLOPT_CAPATH, might
73 be NULL */
74 /* when 'age' is CURLVERSION_EIGHTH or higher (>= 7.71.0), the members
75 below exist */
76 unsigned int zstd_ver_num; /* Numeric Zstd version
77 (MAJOR << 24) | (MINOR << 12) | PATCH */
78 const char *zstd_version; /* human readable string. */
79 /* when 'age' is CURLVERSION_NINTH or higher (>= 7.75.0), the members
80 below exist */
81 const char *hyper_version; /* human readable string. */
82 /* when 'age' is CURLVERSION_TENTH or higher (>= 7.77.0), the members
83 below exist */
84 const char *gsasl_version; /* human readable string. */
85 } curl_version_info_data;
86 age describes what the age of this struct is. The number depends on how
88 new the libcurl you are using is. You are however guaranteed to get a
89 struct that you have a matching struct for in the header, as you tell
90 libcurl your "age" with the input argument.
91 version is just an ascii string for the libcurl version.
93 version_num is a 24 bit number created like this: <8 bits major number>
95 | <8 bits minor number> | <8 bits patch number>. Version 7.9.8 is
96 therefore returned as 0x070908.
97 host is an ascii string showing what host information that this libcurl
99 was built for. As discovered by a configure script or set by the build
100 environment.
101 features can have none, one or more bits set, and the currently defined
103 bits are:
104 CURL_VERSION_ALTSVC
106 HTTP Alt-Svc parsing and the associated options (Added in
107 7.64.1)
108 CURL_VERSION_ASYNCHDNS
110 libcurl was built with support for asynchronous name
111 lookups, which allows more exact timeouts (even on Win‐
112 dows) and less blocking when using the multi interface.
113 (added in 7.10.7)
114 CURL_VERSION_BROTLI
116 supports HTTP Brotli content encoding using libbrotlidec
117 (Added in 7.57.0)
118 CURL_VERSION_ZSTD
120 supports HTTP zstd content encoding using zstd library
121 (Added in 7.72.0)
122 CURL_VERSION_CONV
124 libcurl was built with support for character conversions,
125 as provided by the CURLOPT_CONV_* callbacks. (Added in
126 7.15.4)
127 CURL_VERSION_CURLDEBUG
129 libcurl was built with memory tracking debug capabili‐
130 ties. This is mainly of interest for libcurl hackers.
131 (added in 7.19.6)
132 CURL_VERSION_DEBUG
134 libcurl was built with debug capabilities (added in
135 7.10.6)
136 CURL_VERSION_GSASL
138 libcurl was built with libgsasl and thus with some extra
139 SCRAM-SHA authentication methods. (added in 7.76.0)
140 CURL_VERSION_GSSAPI
142 libcurl was built with support for GSS-API. This makes
143 libcurl use provided functions for Kerberos and SPNEGO
144 authentication. It also allows libcurl to use the current
145 user credentials without the app having to pass them on.
146 (Added in 7.38.0)
147 CURL_VERSION_GSSNEGOTIATE
149 supports HTTP GSS-Negotiate (added in 7.10.6)
150 CURL_VERSION_HSTS
152 libcurl was built with support for HSTS (HTTP Strict
153 Transport Security) (Added in 7.74.0)
154 CURL_VERSION_HTTPS_PROXY
156 libcurl was built with support for HTTPS-proxy. (Added
157 in 7.52.0)
158 CURL_VERSION_HTTP2
160 libcurl was built with support for HTTP2. (Added in
161 7.33.0)
162 CURL_VERSION_HTTP3
164 HTTP/3 and QUIC support are built-in (Added in 7.66.0)
165 CURL_VERSION_IDN
167 libcurl was built with support for IDNA, domain names
168 with international letters. (Added in 7.12.0)
169 CURL_VERSION_IPV6
171 supports IPv6
172 CURL_VERSION_KERBEROS4
174 supports Kerberos V4 (when using FTP). Legacy bit. Depre‐
175 cated since 7.33.0.
176 CURL_VERSION_KERBEROS5
178 supports Kerberos V5 authentication for FTP, IMAP, LDAP,
179 POP3, SMTP and SOCKSv5 proxy. (Added in 7.40.0)
180 CURL_VERSION_LARGEFILE
182 libcurl was built with support for large files. (Added in
183 7.11.1)
184 CURL_VERSION_UNICODE
186 libcurl was built with Unicode support on Windows. This
187 makes non-ASCII characters work in filenames and options
188 passed to libcurl. (Added in 7.72.0)
189 CURL_VERSION_LIBZ
191 supports HTTP deflate using libz (Added in 7.10)
192 CURL_VERSION_MULTI_SSL
194 libcurl was built with multiple SSL backends. For de‐
195 tails, see curl_global_sslset(3). (Added in 7.56.0)
196 CURL_VERSION_NTLM
198 supports HTTP NTLM (added in 7.10.6)
199 CURL_VERSION_NTLM_WB
201 libcurl was built with support for NTLM delegation to a
202 winbind helper. (Added in 7.22.0)
203 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 CURL_VERSION_SPNEGO
210 libcurl was built with support for SPNEGO authentication
211 (Simple and Protected GSS-API Negotiation Mechanism, de‐
212 fined in RFC 2478.) (added in 7.10.8)
213 CURL_VERSION_SSL
215 supports SSL (HTTPS/FTPS) (Added in 7.10)
216 CURL_VERSION_SSPI
218 libcurl was built with support for SSPI. This is only
219 available on Windows and makes libcurl use Windows-pro‐
220 vided functions for Kerberos, NTLM, SPNEGO and Digest au‐
221 thentication. It also allows libcurl to use the current
222 user credentials without the app having to pass them on.
223 (Added in 7.13.2)
224 CURL_VERSION_THREADSAFE
226 libcurl was built with thread-safety support (Atomic or
227 SRWLOCK) to protect curl initialisation. (Added in
228 7.84.0) See libcurl-thread(3)
229 CURL_VERSION_TLSAUTH_SRP
231 libcurl was built with support for TLS-SRP (in one or
232 more of the built-in TLS backends). (Added in 7.21.4)
233 CURL_VERSION_UNIX_SOCKETS
235 libcurl was built with support for Unix domain sockets.
236 (Added in 7.40.0)
237 ssl_version is an ASCII string for the TLS library name + version used.
238 If libcurl has no SSL support, this is NULL. For example "Schannel",
239 "SecureTransport" or "OpenSSL/1.1.0g".
240 ssl_version_num is always 0.
242 libz_version is an ASCII string (there is no numerical version). If
244 libcurl has no libz support, this is NULL.
245 protocols is a pointer to an array of char * pointers, containing the
247 names protocols that libcurl supports (using lowercase letters). The
248 protocol names are the same as would be used in URLs. The array is ter‐
249 minated by a NULL entry.
250
252 curl_version_info_data *ver = curl_version_info(CURLVERSION_NOW);
253 printf("libcurl version %u.%u.%u\n",
254 (ver->version_num >> 16) & 0xff,
255 (ver->version_num >> 8) & 0xff,
256 ver->version_num & 0xff,
257
259 Added in 7.10
260
262 A pointer to a curl_version_info_data struct.
263
265 curl_version(3)
266libcurl 7.85.0 June 13, 2022 curl_version_info(3)