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74 lines
2.2 KiB
74 lines
2.2 KiB
14 years ago
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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_conf=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 string
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(module* in the above example) is looked up and its init 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 further
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lookups based on the value. Multiple instances of the same config module can be
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loaded.
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When the application closes down the modules are cleaned up by calling an
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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 a DSO
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with the supplied name. This might mean that "module3" attempts to load a DSO
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called libmodule3.so or module3.dll for example. An explicit DSO name can be
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given by including a separate section as in the module4 example 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
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*ffunc);
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where "name" is the name in the configuration file this function corresponds
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to.
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A set of builtin modules (currently only an ASN1 non functional test module)
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can be added by calling OPENSSL_load_builtin_modules().
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The function OPENSSL_config() is intended as a simple configuration function
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that any application can call to perform various default configuration tasks.
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It uses the file openssl.cnf in the usual locations.
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