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e0a651945c
Add copyright to most .pl files This does NOT cover any .pl file that has other copyright in it. Most of those are Andy's but some are public domain. Fix typo's in some existing files. Reviewed-by: Richard Levitte <levitte@openssl.org>
105 lines
3.9 KiB
C
105 lines
3.9 KiB
C
/*
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* Copyright 2016 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the OpenSSL licenses (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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* https://www.openssl.org/source/license.html
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* or in the file LICENSE in the source distribution.
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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 "internal/dso_conf.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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int 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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CRYPTO_RWLOCK *lock;
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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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/* 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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