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107 lines
4.0 KiB
C
107 lines
4.0 KiB
C
/*
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* Copyright 2016-2023 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the Apache License 2.0 (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#include <stdio.h>
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#include "internal/cryptlib.h"
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#include "internal/dso.h"
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#include "crypto/dso_conf.h"
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#include "internal/refcount.h"
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/**********************************************************************/
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/* The low-level handle type used to refer to a loaded shared library */
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struct dso_st {
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DSO_METHOD *meth;
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/*
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* Standard dlopen uses a (void *). Win32 uses a HANDLE. VMS doesn't use
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* anything but will need to cache the filename for use in the dso_bind
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* handler. All in all, let each method control its own destiny.
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* "Handles" and such go in a STACK.
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*/
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STACK_OF(void) *meth_data;
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CRYPTO_REF_COUNT references;
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int flags;
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/*
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* For use by applications etc ... use this for your bits'n'pieces, don't
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* touch meth_data!
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*/
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CRYPTO_EX_DATA ex_data;
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/*
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* If this callback function pointer is set to non-NULL, then it will be
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* used in DSO_load() in place of meth->dso_name_converter. NB: This
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* should normally set using DSO_set_name_converter().
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*/
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DSO_NAME_CONVERTER_FUNC name_converter;
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/*
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* If this callback function pointer is set to non-NULL, then it will be
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* used in DSO_load() in place of meth->dso_merger. NB: This should
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* normally set using DSO_set_merger().
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*/
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DSO_MERGER_FUNC merger;
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/*
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* This is populated with (a copy of) the platform-independent filename
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* used for this DSO.
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*/
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char *filename;
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/*
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* This is populated with (a copy of) the translated filename by which
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* the DSO was actually loaded. It is NULL iff the DSO is not currently
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* loaded. NB: This is here because the filename translation process may
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* involve a callback being invoked more than once not only to convert to
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* a platform-specific form, but also to try different filenames in the
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* process of trying to perform a load. As such, this variable can be
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* used to indicate (a) whether this DSO structure corresponds to a
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* loaded library or not, and (b) the filename with which it was actually
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* loaded.
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*/
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char *loaded_filename;
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};
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struct dso_meth_st {
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const char *name;
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/*
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* Loads a shared library, NB: new DSO_METHODs must ensure that a
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* successful load populates the loaded_filename field, and likewise a
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* successful unload OPENSSL_frees and NULLs it out.
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*/
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int (*dso_load) (DSO *dso);
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/* Unloads a shared library */
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int (*dso_unload) (DSO *dso);
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/*
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* Binds a function - assumes a return type of DSO_FUNC_TYPE. This should
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* be cast to the real function prototype by the caller. Platforms that
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* don't have compatible representations for different prototypes (this
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* is possible within ANSI C) are highly unlikely to have shared
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* libraries at all, let alone a DSO_METHOD implemented for them.
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*/
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DSO_FUNC_TYPE (*dso_bind_func) (DSO *dso, const char *symname);
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/*
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* The generic (yuck) "ctrl()" function. NB: Negative return values
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* (rather than zero) indicate errors.
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*/
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long (*dso_ctrl) (DSO *dso, int cmd, long larg, void *parg);
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/*
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* The default DSO_METHOD-specific function for converting filenames to a
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* canonical native form.
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*/
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DSO_NAME_CONVERTER_FUNC dso_name_converter;
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/*
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* The default DSO_METHOD-specific function for converting filenames to a
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* canonical native form.
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*/
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DSO_MERGER_FUNC dso_merger;
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/* [De]Initialisation handlers. */
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int (*init) (DSO *dso);
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int (*finish) (DSO *dso);
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/* Return pathname of the module containing location */
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int (*pathbyaddr) (void *addr, char *path, int sz);
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/* Perform global symbol lookup, i.e. among *all* modules */
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void *(*globallookup) (const char *symname);
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};
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