1curl_version_info(3) libcurl Manual curl_version_info(3)
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6 curl_version_info - returns run-time 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);
23 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 The curl_version_info_data struct looks like this
29 typedef struct {
31 CURLversion age; /* see description below */
32 const char *version; /* human readable string */
34 unsigned int version_num; /* numeric representation */
35 const char *host; /* human readable string */
36 int features; /* bitmask, see below */
37 char *ssl_version; /* human readable string */
38 long ssl_version_num; /* not used, always zero */
39 const char *libz_version; /* human readable string */
40 const char * const *protocols; /* protocols */
41 /* when 'age' is CURLVERSION_SECOND or higher, the members below exist */
43 const char *ares; /* human readable string */
44 int ares_num; /* number */
45 /* when 'age' is CURLVERSION_THIRD or higher, the members below exist */
47 const char *libidn; /* human readable string */
48 /* when 'age' is CURLVERSION_FOURTH or higher (>= 7.16.1), the members
50 below exist */
51 int iconv_ver_num; /* '_libiconv_version' if iconv support enabled */
52 const char *libssh_version; /* human readable string */
54 /* when 'age' is CURLVERSION_FIFTH or higher (>= 7.57.0), the members
56 below exist */
57 unsigned int brotli_ver_num; /* Numeric Brotli version
58 (MAJOR << 24) | (MINOR << 12) | PATCH */
59 const char *brotli_version; /* human readable string. */
60 /* when 'age' is CURLVERSION_SIXTH or higher (>= 7.66.0), the members
62 below exist */
63 unsigned int nghttp2_ver_num; /* Numeric nghttp2 version
64 (MAJOR << 16) | (MINOR << 8) | PATCH */
65 const char *nghttp2_version; /* human readable string. */
66 const char *quic_version; /* human readable quic (+ HTTP/3) library +
68 version or NULL */
69 /* when 'age' is CURLVERSION_SEVENTH or higher (>= 7.70.0), the members
71 below exist */
72 const char *cainfo; /* the built-in default CURLOPT_CAINFO, might
73 be NULL */
74 const char *capath; /* the built-in default CURLOPT_CAPATH, might
75 be NULL */
76 /* when 'age' is CURLVERSION_EIGHTH or higher (>= 7.71.0), the members
77 below exist */
78 unsigned int zstd_ver_num; /* Numeric Zstd version
79 (MAJOR << 24) | (MINOR << 12) | PATCH */
80 const char *zstd_version; /* human readable string. */
81 } curl_version_info_data;
82 age describes what the age of this struct is. The number depends on how
84 new the libcurl you're using is. You are however guaranteed to get a
85 struct that you have a matching struct for in the header, as you tell
86 libcurl your "age" with the input argument.
87 version is just an ascii string for the libcurl version.
89 version_num is a 24 bit number created like this: <8 bits major number>
91 | <8 bits minor number> | <8 bits patch number>. Version 7.9.8 is
92 therefore returned as 0x070908.
93 host is an ascii string showing what host information that this libcurl
95 was built for. As discovered by a configure script or set by the build
96 environment.
97 features can have none, one or more bits set, and the currently defined
99 bits are:
100 CURL_VERSION_ALTSVC
102 HTTP Alt-Svc parsing and the associated options (Added in
103 7.64.1)
104 CURL_VERSION_ASYNCHDNS
106 libcurl was built with support for asynchronous name
107 lookups, which allows more exact timeouts (even on Win‐
108 dows) and less blocking when using the multi interface.
109 (added in 7.10.7)
110 CURL_VERSION_BROTLI
112 supports HTTP Brotli content encoding using libbrotlidec
113 (Added in 7.57.0)
114 CURL_VERSION_ZSTD
116 supports HTTP zstd content encoding using zstd library
117 (Added in 7.72.0)
118 CURL_VERSION_CONV
120 libcurl was built with support for character conversions,
121 as provided by the CURLOPT_CONV_* callbacks. (Added in
122 7.15.4)
123 CURL_VERSION_CURLDEBUG
125 libcurl was built with memory tracking debug capabili‐
126 ties. This is mainly of interest for libcurl hackers.
127 (added in 7.19.6)
128 CURL_VERSION_DEBUG
130 libcurl was built with debug capabilities (added in
131 7.10.6)
132 CURL_VERSION_GSASL
134 libcurl was built with libgsasl and thus with some extra
135 SCRAM-SHA authentication methods. (added in 7.76.0)
136 CURL_VERSION_GSSAPI
138 libcurl was built with support for GSS-API. This makes
139 libcurl use provided functions for Kerberos and SPNEGO
140 authentication. It also allows libcurl to use the current
141 user credentials without the app having to pass them on.
142 (Added in 7.38.0)
143 CURL_VERSION_GSSNEGOTIATE
145 supports HTTP GSS-Negotiate (added in 7.10.6)
146 CURL_VERSION_HSTS
148 libcurl was built with support for HSTS (HTTP Strict
149 Transport Security) (Added in 7.74.0)
150 CURL_VERSION_HTTPS_PROXY
152 libcurl was built with support for HTTPS-proxy. (Added
153 in 7.52.0)
154 CURL_VERSION_HTTP2
156 libcurl was built with support for HTTP2. (Added in
157 7.33.0)
158 CURL_VERSION_HTTP3
160 HTTP/3 and QUIC support are built-in (Added in 7.66.0)
161 CURL_VERSION_IDN
163 libcurl was built with support for IDNA, domain names
164 with international letters. (Added in 7.12.0)
165 CURL_VERSION_IPV6
167 supports IPv6
168 CURL_VERSION_KERBEROS4
170 supports Kerberos V4 (when using FTP). Legacy bit. Depre‐
171 cated since 7.33.0.
172 CURL_VERSION_KERBEROS5
174 supports Kerberos V5 authentication for FTP, IMAP, POP3,
175 SMTP and SOCKSv5 proxy (Added in 7.40.0)
176 CURL_VERSION_LARGEFILE
178 libcurl was built with support for large files. (Added in
179 7.11.1)
180 CURL_VERSION_UNICODE
182 libcurl was built with Unicode support on Windows. This
183 makes non-ASCII characters work in filenames and options
184 passed to libcurl. (Added in 7.72.0)
185 CURL_VERSION_LIBZ
187 supports HTTP deflate using libz (Added in 7.10)
188 CURL_VERSION_MULTI_SSL
190 libcurl was built with multiple SSL backends. For de‐
191 tails, see curl_global_sslset(3). (Added in 7.56.0)
192 CURL_VERSION_NTLM
194 supports HTTP NTLM (added in 7.10.6)
195 CURL_VERSION_NTLM_WB
197 libcurl was built with support for NTLM delegation to a
198 winbind helper. (Added in 7.22.0)
199 CURL_VERSION_PSL
201 libcurl was built with support for Mozilla's Public Suf‐
202 fix List. This makes libcurl ignore cookies with a domain
203 that's on the list. (Added in 7.47.0)
204 CURL_VERSION_SPNEGO
206 libcurl was built with support for SPNEGO authentication
207 (Simple and Protected GSS-API Negotiation Mechanism, de‐
208 fined in RFC 2478.) (added in 7.10.8)
209 CURL_VERSION_SSL
211 supports SSL (HTTPS/FTPS) (Added in 7.10)
212 CURL_VERSION_SSPI
214 libcurl was built with support for SSPI. This is only
215 available on Windows and makes libcurl use Windows-pro‐
216 vided functions for Kerberos, NTLM, SPNEGO and Digest au‐
217 thentication. It also allows libcurl to use the current
218 user credentials without the app having to pass them on.
219 (Added in 7.13.2)
220 CURL_VERSION_TLSAUTH_SRP
222 libcurl was built with support for TLS-SRP (in one or
223 more of the built-in TLS backends). (Added in 7.21.4)
224 CURL_VERSION_UNIX_SOCKETS
226 libcurl was built with support for Unix domain sockets.
227 (Added in 7.40.0)
228 ssl_version is an ASCII string for the TLS library name + version used.
229 If libcurl has no SSL support, this is NULL. For example "Schannel",
230 "SecureTransport" or "OpenSSL/1.1.0g".
231 ssl_version_num is always 0.
233 libz_version is an ASCII string (there is no numerical version). If
235 libcurl has no libz support, this is NULL.
236 protocols is a pointer to an array of char * pointers, containing the
238 names protocols that libcurl supports (using lowercase letters). The
239 protocol names are the same as would be used in URLs. The array is ter‐
240 minated by a NULL entry.
241
243 A pointer to a curl_version_info_data struct.
244
246 curl_version(3)
247libcurl 7.76.1 February 11, 2021 curl_version_info(3)