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diff --git a/src/lib/libcrypto/doc/OPENSSL_config.pod b/src/lib/libcrypto/doc/OPENSSL_config.pod new file mode 100644 index 0000000000..e7bba2aaca --- /dev/null +++ b/src/lib/libcrypto/doc/OPENSSL_config.pod | |||
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| 1 | =pod | ||
| 2 | |||
| 3 | =head1 NAME | ||
| 4 | |||
| 5 | OPENSSL_config, OPENSSL_no_config - simple OpenSSL configuration functions | ||
| 6 | |||
| 7 | =head1 SYNOPSIS | ||
| 8 | |||
| 9 | #include <openssl/conf.h> | ||
| 10 | |||
| 11 | void OPENSSL_config(const char *config_name); | ||
| 12 | void OPENSSL_no_config(void); | ||
| 13 | |||
| 14 | =head1 DESCRIPTION | ||
| 15 | |||
| 16 | OPENSSL_config() configures OpenSSL using the standard B<openssl.cnf> | ||
| 17 | configuration file name using B<config_name>. If B<config_name> is NULL then | ||
| 18 | the default name B<openssl_conf> will be used. Any errors are ignored. Further | ||
| 19 | calls to OPENSSL_config() will have no effect. The configuration file format | ||
| 20 | is documented in the L<conf(5)|conf(5)> manual page. | ||
| 21 | |||
| 22 | OPENSSL_no_config() disables configuration. If called before OPENSSL_config() | ||
| 23 | no configuration takes place. | ||
| 24 | |||
| 25 | =head1 NOTES | ||
| 26 | |||
| 27 | It is B<strongly> recommended that B<all> new applications call OPENSSL_config() | ||
| 28 | or the more sophisticated functions such as CONF_modules_load() during | ||
| 29 | initialization (that is before starting any threads). By doing this | ||
| 30 | an application does not need to keep track of all configuration options | ||
| 31 | and some new functionality can be supported automatically. | ||
| 32 | |||
| 33 | It is also possible to automatically call OPENSSL_config() when an application | ||
| 34 | calls OPENSSL_add_all_algorithms() by compiling an application with the | ||
| 35 | preprocessor symbol B<OPENSSL_LOAD_CONF> #define'd. In this way configuration | ||
| 36 | can be added without source changes. | ||
| 37 | |||
| 38 | The environment variable B<OPENSSL_CONF> can be set to specify the location | ||
| 39 | of the configuration file. | ||
| 40 | |||
| 41 | Currently ASN1 OBJECTs and ENGINE configuration can be performed future | ||
| 42 | versions of OpenSSL will add new configuration options. | ||
| 43 | |||
| 44 | There are several reasons why calling the OpenSSL configuration routines is | ||
| 45 | advisable. For example new ENGINE functionality was added to OpenSSL 0.9.7. | ||
| 46 | In OpenSSL 0.9.7 control functions can be supported by ENGINEs, this can be | ||
| 47 | used (among other things) to load dynamic ENGINEs from shared libraries (DSOs). | ||
| 48 | However very few applications currently support the control interface and so | ||
| 49 | very few can load and use dynamic ENGINEs. Equally in future more sophisticated | ||
| 50 | ENGINEs will require certain control operations to customize them. If an | ||
| 51 | application calls OPENSSL_config() it doesn't need to know or care about | ||
| 52 | ENGINE control operations because they can be performed by editing a | ||
| 53 | configuration file. | ||
| 54 | |||
| 55 | Applications should free up configuration at application closedown by calling | ||
| 56 | CONF_modules_free(). | ||
| 57 | |||
| 58 | =head1 RESTRICTIONS | ||
| 59 | |||
| 60 | The OPENSSL_config() function is designed to be a very simple "call it and | ||
| 61 | forget it" function. As a result its behaviour is somewhat limited. It ignores | ||
| 62 | all errors silently and it can only load from the standard configuration file | ||
| 63 | location for example. | ||
| 64 | |||
| 65 | It is however B<much> better than nothing. Applications which need finer | ||
| 66 | control over their configuration functionality should use the configuration | ||
| 67 | functions such as CONF_load_modules() directly. | ||
| 68 | |||
| 69 | =head1 RETURN VALUES | ||
| 70 | |||
| 71 | Neither OPENSSL_config() nor OPENSSL_no_config() return a value. | ||
| 72 | |||
| 73 | =head1 SEE ALSO | ||
| 74 | |||
| 75 | L<conf(5)|conf(5)>, L<CONF_load_modules_file(3)|CONF_load_modules_file(3)>, | ||
| 76 | L<CONF_modules_free(3),CONF_modules_free(3)> | ||
| 77 | |||
| 78 | =head1 HISTORY | ||
| 79 | |||
| 80 | OPENSSL_config() and OPENSSL_no_config() first appeared in OpenSSL 0.9.7 | ||
| 81 | |||
| 82 | =cut | ||
