Config docs.

=pod

=head1 NAME

 CONF_modules_free, CONF_modules_load, CONF_modules_unload -

 OpenSSL configuration cleanup functions

=head1 SYNOPSIS

 #include <openssl/conf.h>

 void CONF_modules_free(void);

 void CONF_modules_unload(int all);

 void CONF_modules_finish(void);

=head1 DESCRIPTION

CONF_modules_free() closes down and frees up all memory allocated by all

configuration modules.

CONF_modules_finish() calls each configuration modules B<finish> handler

to free up any configuration that module may have performed.

CONF_modules_unload() finishes and unloads configuration modules. If

B<all> is set to B<0> only modules loaded from DSOs will be unloads. If

B<all> is B<1> all modules, including builtin modules will be unloaded.

=head1 NOTES

Normally applications will only call CONF_modules_free() at application to

tidy up any configuration performed.

=head1 RETURN VALUE

None of the functions return a value.

=head1 SEE ALSO

L<conf(5)|conf(5)>, L<OPENSSL_config(3)|OPENSSL_config(3)>,

L<CONF_modules_load_file(3), CONF_modules_load_file(3)>

=head1 HISTORY

CONF_modules_free(), CONF_modules_unload(), and CONF_modules_finish()

first appeared in OpenSSL 0.9.7.

=cut

=pod

=head1 NAME

 CONF_modules_load_file, CONF_modules_load - OpenSSL configuration functions

=head1 SYNOPSIS

 #include <openssl/conf.h>

 int CONF_modules_load_file(const char *filename, const char *appname,

			   unsigned long flags);

 int CONF_modules_load(const CONF *cnf, const char *appname,

		      unsigned long flags);

=head1 DESCRIPTION

The function CONF_modules_load_file() configures OpenSSL using file

B<filename> and application name B<appname>. If B<filename> is NULL

the standard OpenSSL configuration file is used. If B<appname> is

NULL the standard OpenSSL application name B<openssl_conf> is used.

The behaviour can be cutomized using B<flags>.

CONF_modules_load() is idential to CONF_modules_load_file() except it

read configuration information from B<cnf>. 

=head1 NOTES

The following B<flags> are currently recognized:

B<CONF_MFLAGS_IGNORE_ERRORS> if set errors returned by individual

configuration modules are ignored. If not set the first module error is

considered fatal and no further modules are loads.

Normally any modules errors will add error information to the error queue. If

B<CONF_MFLAGS_SILENT> is set no error information is added.

If B<CONF_MFLAGS_NO_DSO> is set configuration module loading from DSOs is

disabled.

B<CONF_MFLAGS_IGNORE_MISSING_FILE> if set will make CONF_load_modules_file()

ignore missing configuration files. Normally a missing configuration file

return an error.

=head1 RETURN VALUE

These functions return 1 for success and a zero or negative value for

failure. If module errors are not ignored the return code will reflect the

return value of the failing module (this will always be zero or negative).

=head1 SEE ALSO

L<conf(5)|conf(5)>, L<OPENSSL_config(3)|OPENSSL_config(3)>,

L<CONF_free(3), CONF_free(3)>, L<err(3),err(3)>

=head1 HISTORY

CONF_modules_load_file and CONF_modules_load first appeared in OpenSSL 0.9.7.

=cut

=head1 NAME

OPENSSL_config, OPENSSL_no_config - minimal OpenSSL configuration

OPENSSL_config, OPENSSL_no_config - simple OpenSSL configuration functions

=head1 SYNOPSIS

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.

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.

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

location for example.

It is however B<much> better than nothing. Applications which need finer

control over the configuration functionality should use the configuration

control over their configuration functionality should use the configuration

functions such as CONF_load_modules() directly.

=head1 RETURN VALUES

=head1 SEE ALSO

L<conf(5)|conf(5)>

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

=pod

=head1 NAME

OPENSSL_load_builtin_modules - add standard configuration modules

=head1 SYNOPSIS

 #include <openssl/conf.h>

 void OPENSSL_load_builtin_modules(void);

 void ASN1_add_oid_module(void);

 ENGINE_add_conf_module();

=head1 DESCRIPTION

The function OPENSSL_load_builtin_modules() adds all the standard OpenSSL

configuration modules to the internal list. They can then be used by the

OpenSSL configuration code.

ASN1_add_oid_module() adds just the ASN1 OBJECT module.

ENGINE_add_conf_module() adds just the ENGINE configuration module.

=head1 NOTES

If the simple configuration function OPENSSL_config() is called then 

OPENSSL_load_builtin_modules() is called automatically.

Applications which use the configuration functions directly will need to

call OPENSSL_load_builtin_modules() themselves I<before> any other 

configuration code.

Applications should call OPENSSL_load_builtin_modules() to load all

configuration modules instead of adding modules selectively: otherwise 

functionality may be missing from the application if an when new

modules are added.

=head1 RETURN VALUE

None of the functions return a value.

=head1 SEE ALSO

L<conf(3)|conf(3)>, L<OPENSSL_config(3)|OPENSSL_config(3)>

=head1 HISTORY

These functions first appeared in OpenSSL 0.9.7.

=cut