5 OPENSSL_config, OPENSSL_no_config - simple OpenSSL configuration functions
9 #include <openssl/conf.h>
11 void OPENSSL_config(const char *appname);
12 void OPENSSL_no_config(void);
16 OPENSSL_config() configures OpenSSL using the standard B<openssl.cnf> and
17 reads from the application section B<appname>. If B<appname> is NULL then
18 the default section, B<openssl_conf>, will be used.
19 Errors are silently ignored.
20 Multiple calls have no effect.
22 OPENSSL_no_config() disables configuration. If called before OPENSSL_config()
23 no configuration takes place.
27 The OPENSSL_config() function is designed to be a very simple "call it and
29 It is however B<much> better than nothing. Applications which need finer
30 control over their configuration functionality should use the configuration
31 functions such as CONF_modules_load() directly. This function is deprecated
32 and its use should be avoided.
33 Applications should instead call CONF_modules_load() during
34 initialization (that is before starting any threads).
36 There are several reasons why calling the OpenSSL configuration routines is
37 advisable. For example new ENGINE functionality was added to OpenSSL 0.9.7.
38 In OpenSSL 0.9.7 control functions can be supported by ENGINEs, this can be
39 used (among other things) to load dynamic ENGINEs from shared libraries (DSOs).
40 However very few applications currently support the control interface and so
41 very few can load and use dynamic ENGINEs. Equally in future more sophisticated
42 ENGINEs will require certain control operations to customize them. If an
43 application calls OPENSSL_config() it doesn't need to know or care about
44 ENGINE control operations because they can be performed by editing a
47 Applications should free up configuration at application closedown by calling
52 Neither OPENSSL_config() nor OPENSSL_no_config() return a value.
56 L<conf(5)|conf(5)>, L<CONF_load_modules_file(3)|CONF_load_modules_file(3)>,
57 L<CONF_modules_free(3)|CONF_modules_free(3)>
61 OPENSSL_config() and OPENSSL_no_config() first appeared in OpenSSL 0.9.7