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 /* when 'age' is CURLVERSION_NINTH or higher (>= 7.75.0), the members
82 below exist */
83 const char *hyper_version; /* human readable string. */
84 /* when 'age' is CURLVERSION_TENTH or higher (>= 7.77.0), the members
85 below exist */
86 const char *gsasl_version; /* human readable string. */
87 } curl_version_info_data;
88 age describes what the age of this struct is. The number depends on how
90 new the libcurl you're using is. You are however guaranteed to get a
91 struct that you have a matching struct for in the header, as you tell
92 libcurl your "age" with the input argument.
93 version is just an ascii string for the libcurl version.
95 version_num is a 24 bit number created like this: <8 bits major number>
97 | <8 bits minor number> | <8 bits patch number>. Version 7.9.8 is
98 therefore returned as 0x070908.
99 host is an ascii string showing what host information that this libcurl
101 was built for. As discovered by a configure script or set by the build
102 environment.
103 features can have none, one or more bits set, and the currently defined
105 bits are:
106 CURL_VERSION_ALTSVC
108 HTTP Alt-Svc parsing and the associated options (Added in
109 7.64.1)
110 CURL_VERSION_ASYNCHDNS
112 libcurl was built with support for asynchronous name
113 lookups, which allows more exact timeouts (even on Win‐
114 dows) and less blocking when using the multi interface.
115 (added in 7.10.7)
116 CURL_VERSION_BROTLI
118 supports HTTP Brotli content encoding using libbrotlidec
119 (Added in 7.57.0)
120 CURL_VERSION_ZSTD
122 supports HTTP zstd content encoding using zstd library
123 (Added in 7.72.0)
124 CURL_VERSION_CONV
126 libcurl was built with support for character conversions,
127 as provided by the CURLOPT_CONV_* callbacks. (Added in
128 7.15.4)
129 CURL_VERSION_CURLDEBUG
131 libcurl was built with memory tracking debug capabili‐
132 ties. This is mainly of interest for libcurl hackers.
133 (added in 7.19.6)
134 CURL_VERSION_DEBUG
136 libcurl was built with debug capabilities (added in
137 7.10.6)
138 CURL_VERSION_GSASL
140 libcurl was built with libgsasl and thus with some extra
141 SCRAM-SHA authentication methods. (added in 7.76.0)
142 CURL_VERSION_GSSAPI
144 libcurl was built with support for GSS-API. This makes
145 libcurl use provided functions for Kerberos and SPNEGO
146 authentication. It also allows libcurl to use the current
147 user credentials without the app having to pass them on.
148 (Added in 7.38.0)
149 CURL_VERSION_GSSNEGOTIATE
151 supports HTTP GSS-Negotiate (added in 7.10.6)
152 CURL_VERSION_HSTS
154 libcurl was built with support for HSTS (HTTP Strict
155 Transport Security) (Added in 7.74.0)
156 CURL_VERSION_HTTPS_PROXY
158 libcurl was built with support for HTTPS-proxy. (Added
159 in 7.52.0)
160 CURL_VERSION_HTTP2
162 libcurl was built with support for HTTP2. (Added in
163 7.33.0)
164 CURL_VERSION_HTTP3
166 HTTP/3 and QUIC support are built-in (Added in 7.66.0)
167 CURL_VERSION_IDN
169 libcurl was built with support for IDNA, domain names
170 with international letters. (Added in 7.12.0)
171 CURL_VERSION_IPV6
173 supports IPv6
174 CURL_VERSION_KERBEROS4
176 supports Kerberos V4 (when using FTP). Legacy bit. Depre‐
177 cated since 7.33.0.
178 CURL_VERSION_KERBEROS5
180 supports Kerberos V5 authentication for FTP, IMAP, POP3,
181 SMTP and SOCKSv5 proxy (Added in 7.40.0)
182 CURL_VERSION_LARGEFILE
184 libcurl was built with support for large files. (Added in
185 7.11.1)
186 CURL_VERSION_UNICODE
188 libcurl was built with Unicode support on Windows. This
189 makes non-ASCII characters work in filenames and options
190 passed to libcurl. (Added in 7.72.0)
191 CURL_VERSION_LIBZ
193 supports HTTP deflate using libz (Added in 7.10)
194 CURL_VERSION_MULTI_SSL
196 libcurl was built with multiple SSL backends. For de‐
197 tails, see curl_global_sslset(3). (Added in 7.56.0)
198 CURL_VERSION_NTLM
200 supports HTTP NTLM (added in 7.10.6)
201 CURL_VERSION_NTLM_WB
203 libcurl was built with support for NTLM delegation to a
204 winbind helper. (Added in 7.22.0)
205 CURL_VERSION_PSL
207 libcurl was built with support for Mozilla's Public Suf‐
208 fix List. This makes libcurl ignore cookies with a domain
209 that's on the list. (Added in 7.47.0)
210 CURL_VERSION_SPNEGO
212 libcurl was built with support for SPNEGO authentication
213 (Simple and Protected GSS-API Negotiation Mechanism, de‐
214 fined in RFC 2478.) (added in 7.10.8)
215 CURL_VERSION_SSL
217 supports SSL (HTTPS/FTPS) (Added in 7.10)
218 CURL_VERSION_SSPI
220 libcurl was built with support for SSPI. This is only
221 available on Windows and makes libcurl use Windows-pro‐
222 vided functions for Kerberos, NTLM, SPNEGO and Digest au‐
223 thentication. It also allows libcurl to use the current
224 user credentials without the app having to pass them on.
225 (Added in 7.13.2)
226 CURL_VERSION_TLSAUTH_SRP
228 libcurl was built with support for TLS-SRP (in one or
229 more of the built-in TLS backends). (Added in 7.21.4)
230 CURL_VERSION_UNIX_SOCKETS
232 libcurl was built with support for Unix domain sockets.
233 (Added in 7.40.0)
234 ssl_version is an ASCII string for the TLS library name + version used.
235 If libcurl has no SSL support, this is NULL. For example "Schannel",
236 "SecureTransport" or "OpenSSL/1.1.0g".
237 ssl_version_num is always 0.
239 libz_version is an ASCII string (there is no numerical version). If
241 libcurl has no libz support, this is NULL.
242 protocols is a pointer to an array of char * pointers, containing the
244 names protocols that libcurl supports (using lowercase letters). The
245 protocol names are the same as would be used in URLs. The array is ter‐
246 minated by a NULL entry.
247
249 A pointer to a curl_version_info_data struct.
250
252 curl_version(3)
253libcurl 7.79.1 April 03, 2021 curl_version_info(3)