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/*
* Copyright 2016 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the OpenSSL license (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#include <stdio.h>
#include "internal/cryptlib.h"
#include "internal/dso.h"
#include "crypto/dso_conf.h"
#include "internal/refcount.h"
/**********************************************************************/
/* The low-level handle type used to refer to a loaded shared library */
struct dso_st {
DSO_METHOD *meth;
/*
* Standard dlopen uses a (void *). Win32 uses a HANDLE. VMS doesn't use
* anything but will need to cache the filename for use in the dso_bind
* handler. All in all, let each method control its own destiny.
* "Handles" and such go in a STACK.
*/
STACK_OF(void) *meth_data;
CRYPTO_REF_COUNT references;
int flags;
/*
* For use by applications etc ... use this for your bits'n'pieces, don't
* touch meth_data!
*/
CRYPTO_EX_DATA ex_data;
/*
* If this callback function pointer is set to non-NULL, then it will be
* used in DSO_load() in place of meth->dso_name_converter. NB: This
* should normally set using DSO_set_name_converter().
*/
DSO_NAME_CONVERTER_FUNC name_converter;
/*
* If this callback function pointer is set to non-NULL, then it will be
* used in DSO_load() in place of meth->dso_merger. NB: This should
* normally set using DSO_set_merger().
*/
DSO_MERGER_FUNC merger;
/*
* This is populated with (a copy of) the platform-independent filename
* used for this DSO.
*/
char *filename;
/*
* This is populated with (a copy of) the translated filename by which
* the DSO was actually loaded. It is NULL iff the DSO is not currently
* loaded. NB: This is here because the filename translation process may
* involve a callback being invoked more than once not only to convert to
* a platform-specific form, but also to try different filenames in the
* process of trying to perform a load. As such, this variable can be
* used to indicate (a) whether this DSO structure corresponds to a
* loaded library or not, and (b) the filename with which it was actually
* loaded.
*/
char *loaded_filename;
CRYPTO_RWLOCK *lock;
};
struct dso_meth_st {
const char *name;
/*
* Loads a shared library, NB: new DSO_METHODs must ensure that a
* successful load populates the loaded_filename field, and likewise a
* successful unload OPENSSL_frees and NULLs it out.
*/
int (*dso_load) (DSO *dso);
/* Unloads a shared library */
int (*dso_unload) (DSO *dso);
/*
* Binds a function - assumes a return type of DSO_FUNC_TYPE. This should
* be cast to the real function prototype by the caller. Platforms that
* don't have compatible representations for different prototypes (this
* is possible within ANSI C) are highly unlikely to have shared
* libraries at all, let alone a DSO_METHOD implemented for them.
*/
DSO_FUNC_TYPE (*dso_bind_func) (DSO *dso, const char *symname);
/*
* The generic (yuck) "ctrl()" function. NB: Negative return values
* (rather than zero) indicate errors.
*/
long (*dso_ctrl) (DSO *dso, int cmd, long larg, void *parg);
/*
* The default DSO_METHOD-specific function for converting filenames to a
* canonical native form.
*/
DSO_NAME_CONVERTER_FUNC dso_name_converter;
/*
* The default DSO_METHOD-specific function for converting filenames to a
* canonical native form.
*/
DSO_MERGER_FUNC dso_merger;
/* [De]Initialisation handlers. */
int (*init) (DSO *dso);
int (*finish) (DSO *dso);
/* Return pathname of the module containing location */
int (*pathbyaddr) (void *addr, char *path, int sz);
/* Perform global symbol lookup, i.e. among *all* modules */
void *(*globallookup) (const char *symname);
};
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