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79 lines
2.3 KiB
Plaintext
79 lines
2.3 KiB
Plaintext
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WARNING WARNING WARNING!!!
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This stuff is experimental, may change radically or be deleted altogether
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before OpenSSL 0.9.7 release. You have been warned!
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Configuration modules. These are a set of modules which can perform
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various configuration functions.
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Currently the routines should be called at most once when an application
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starts up: that is before it starts any threads.
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The routines read a configuration file set up like this:
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-----
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#default section
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openssl_init=init_section
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[init_section]
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module1=value1
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#Second instance of module1
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module1.1=valueX
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module2=value2
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module3=dso_literal
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module4=dso_section
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[dso_section]
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path=/some/path/to/some/dso.so
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other_stuff=other_value
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----
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When this file is loaded a configuration module with the specified
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string (module* in the above example) is looked up and its init
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function called as:
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int conf_init_func(CONF_IMODULE *md, CONF *cnf);
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The function can then take whatever action is appropriate, for example
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further lookups based on the value. Multiple instances of the same
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config module can be loaded.
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When the application closes down the modules are cleaned up by calling
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an optional finish function:
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void conf_finish_func(CONF_IMODULE *md);
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The finish functions are called in reverse order: that is the last module
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loaded is the first one cleaned up.
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If no module exists with a given name then an attempt is made to load
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a DSO with the supplied name. This might mean that "module3" attempts
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to load a DSO called libmodule3.so or module3.dll for example. An explicit
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DSO name can be given by including a separate section as in the module4 example
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above.
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The DSO is expected to at least contain an initialization function:
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int OPENSSL_init(CONF_IMODULE *md, CONF *cnf);
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and may also include a finish function:
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void OPENSSL_finish(CONF_IMODULE *md);
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Static modules can also be added using,
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int CONF_module_add(char *name, dso_mod_init_func *ifunc, dso_mod_finish_func *ffunc);
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where "name" is the name in the configuration file this function corresponds to.
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A set of builtin modules (currently only an ASN1 non functional test module) can be
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added by calling OPENSSL_load_builtin_modules().
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The function OPENSSL_config() is intended as a simple configuration function that
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any application can call to perform various default configuration tasks. It uses the
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file openssl.cnf in the usual locations.
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