82 lines
3.1 KiB
Text
82 lines
3.1 KiB
Text
=pod
|
|
|
|
=head1 NAME
|
|
|
|
OPENSSL_config, OPENSSL_no_config - simple OpenSSL configuration functions
|
|
|
|
=head1 SYNOPSIS
|
|
|
|
#include <openssl/conf.h>
|
|
|
|
void OPENSSL_config(const char *config_name);
|
|
void OPENSSL_no_config(void);
|
|
|
|
=head1 DESCRIPTION
|
|
|
|
OPENSSL_config() configures OpenSSL using the standard B<openssl.cnf>
|
|
configuration file name using B<config_name>. If B<config_name> is NULL then
|
|
the default name B<openssl_conf> will be used. Any errors are ignored. Further
|
|
calls to OPENSSL_config() will have no effect. The configuration file format
|
|
is documented in the L<conf(5)|conf(5)> manual page.
|
|
|
|
OPENSSL_no_config() disables configuration. If called before OPENSSL_config()
|
|
no configuration takes place.
|
|
|
|
=head1 NOTES
|
|
|
|
It is B<strongly> recommended that B<all> new applications call OPENSSL_config()
|
|
or the more sophisticated functions such as CONF_modules_load() during
|
|
initialization (that is before starting any threads). By doing this
|
|
an application does not need to keep track of all configuration options
|
|
and some new functionality can be supported automatically.
|
|
|
|
It is also possible to automatically call OPENSSL_config() when an application
|
|
calls OPENSSL_add_all_algorithms() by compiling an application with the
|
|
preprocessor symbol B<OPENSSL_LOAD_CONF> #define'd. In this way configuration
|
|
can be added without source changes.
|
|
|
|
The environment variable B<OPENSSL_CONFIG> can be set to specify the location
|
|
of the configuration file.
|
|
|
|
Currently ASN1 OBJECTs and ENGINE configuration can be performed future
|
|
versions of OpenSSL will add new configuration options.
|
|
|
|
There are several reasons why calling the OpenSSL configuration routines is
|
|
advisable. For example new ENGINE functionality was added to OpenSSL 0.9.7.
|
|
In OpenSSL 0.9.7 control functions can be supported by ENGINEs, this can be
|
|
used (among other things) to load dynamic ENGINEs from shared libraries (DSOs).
|
|
However very few applications currently support the control interface and so
|
|
very few can load and use dynamic ENGINEs. Equally in future more sophisticated
|
|
ENGINEs will require certain control operations to customize them. If an
|
|
application calls OPENSSL_config() it doesn't need to know or care about
|
|
ENGINE control operations because they can be performed by editing a
|
|
configuration file.
|
|
|
|
Applications should free up configuration at application closedown by calling
|
|
CONF_modules_free().
|
|
|
|
=head1 RESTRICTIONS
|
|
|
|
The OPENSSL_config() function is designed to be a very simple "call it and
|
|
forget it" function. As a result its behaviour is somewhat limited. It ignores
|
|
all errors silently and it can only load from the standard configuration file
|
|
location for example.
|
|
|
|
It is however B<much> better than nothing. Applications which need finer
|
|
control over their configuration functionality should use the configuration
|
|
functions such as CONF_load_modules() directly.
|
|
|
|
=head1 RETURN VALUES
|
|
|
|
Neither OPENSSL_config() nor OPENSSL_no_config() return a value.
|
|
|
|
=head1 SEE ALSO
|
|
|
|
L<conf(5)|conf(5)>, L<CONF_load_modules_file(3)|CONF_load_modules_file(3)>,
|
|
L<CONF_modules_free(3),CONF_modules_free(3)>
|
|
|
|
=head1 HISTORY
|
|
|
|
OPENSSL_config() and OPENSSL_no_config() first appeared in OpenSSL 0.9.7
|
|
|
|
=cut
|