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410 lines
18 KiB
C
410 lines
18 KiB
C
/* dso.h -*- mode:C; c-file-style: "eay" -*- */
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/* Written by Geoff Thorpe (geoff@geoffthorpe.net) for the OpenSSL
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* project 2000.
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*/
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/* ====================================================================
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* Copyright (c) 2000 The OpenSSL Project. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. All advertising materials mentioning features or use of this
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* software must display the following acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
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*
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* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
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* endorse or promote products derived from this software without
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* prior written permission. For written permission, please contact
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* licensing@OpenSSL.org.
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*
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* 5. Products derived from this software may not be called "OpenSSL"
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* nor may "OpenSSL" appear in their names without prior written
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* permission of the OpenSSL Project.
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*
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* 6. Redistributions of any form whatsoever must retain the following
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* acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
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*
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* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
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* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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* ====================================================================
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*
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* This product includes cryptographic software written by Eric Young
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* (eay@cryptsoft.com). This product includes software written by Tim
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* Hudson (tjh@cryptsoft.com).
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*
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*/
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#ifndef HEADER_DSO_H
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#define HEADER_DSO_H
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#include <openssl/crypto.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* These values are used as commands to DSO_ctrl() */
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#define DSO_CTRL_GET_FLAGS 1
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#define DSO_CTRL_SET_FLAGS 2
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#define DSO_CTRL_OR_FLAGS 3
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/* By default, DSO_load() will translate the provided filename into a form
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* typical for the platform (more specifically the DSO_METHOD) using the
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* dso_name_converter function of the method. Eg. win32 will transform "blah"
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* into "blah.dll", and dlfcn will transform it into "libblah.so". The
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* behaviour can be overriden by setting the name_converter callback in the DSO
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* object (using DSO_set_name_converter()). This callback could even utilise
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* the DSO_METHOD's converter too if it only wants to override behaviour for
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* one or two possible DSO methods. However, the following flag can be set in a
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* DSO to prevent *any* native name-translation at all - eg. if the caller has
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* prompted the user for a path to a driver library so the filename should be
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* interpreted as-is. */
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#define DSO_FLAG_NO_NAME_TRANSLATION 0x01
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/* An extra flag to give if only the extension should be added as
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* translation. This is obviously only of importance on Unix and
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* other operating systems where the translation also may prefix
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* the name with something, like 'lib', and ignored everywhere else.
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* This flag is also ignored if DSO_FLAG_NO_NAME_TRANSLATION is used
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* at the same time. */
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#define DSO_FLAG_NAME_TRANSLATION_EXT_ONLY 0x02
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/* The following flag controls the translation of symbol names to upper
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* case. This is currently only being implemented for OpenVMS.
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*/
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#define DSO_FLAG_UPCASE_SYMBOL 0x10
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/* This flag loads the library with public symbols.
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* Meaning: The exported symbols of this library are public
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* to all libraries loaded after this library.
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* At the moment only implemented in unix.
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*/
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#define DSO_FLAG_GLOBAL_SYMBOLS 0x20
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typedef void (*DSO_FUNC_TYPE)(void);
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typedef struct dso_st DSO;
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/* The function prototype used for method functions (or caller-provided
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* callbacks) that transform filenames. They are passed a DSO structure pointer
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* (or NULL if they are to be used independantly of a DSO object) and a
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* filename to transform. They should either return NULL (if there is an error
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* condition) or a newly allocated string containing the transformed form that
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* the caller will need to free with OPENSSL_free() when done. */
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typedef char* (*DSO_NAME_CONVERTER_FUNC)(DSO *, const char *);
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/* The function prototype used for method functions (or caller-provided
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* callbacks) that merge two file specifications. They are passed a
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* DSO structure pointer (or NULL if they are to be used independantly of
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* a DSO object) and two file specifications to merge. They should
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* either return NULL (if there is an error condition) or a newly allocated
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* string containing the result of merging that the caller will need
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* to free with OPENSSL_free() when done.
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* Here, merging means that bits and pieces are taken from each of the
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* file specifications and added together in whatever fashion that is
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* sensible for the DSO method in question. The only rule that really
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* applies is that if the two specification contain pieces of the same
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* type, the copy from the first string takes priority. One could see
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* it as the first specification is the one given by the user and the
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* second being a bunch of defaults to add on if they're missing in the
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* first. */
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typedef char* (*DSO_MERGER_FUNC)(DSO *, const char *, const char *);
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typedef struct dso_meth_st
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{
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const char *name;
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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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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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/* Binds a variable */
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void *(*dso_bind_var)(DSO *dso, const char *symname);
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/* Binds a function - assumes a return type of DSO_FUNC_TYPE.
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* This should be cast to the real function prototype by the
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* caller. Platforms that don't have compatible representations
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* for different prototypes (this is possible within ANSI C)
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* are highly unlikely to have shared libraries at all, let
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* alone a DSO_METHOD implemented for them. */
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DSO_FUNC_TYPE (*dso_bind_func)(DSO *dso, const char *symname);
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/* I don't think this would actually be used in any circumstances. */
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#if 0
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/* Unbinds a variable */
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int (*dso_unbind_var)(DSO *dso, char *symname, void *symptr);
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/* Unbinds a function */
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int (*dso_unbind_func)(DSO *dso, char *symname, DSO_FUNC_TYPE symptr);
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#endif
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/* The generic (yuck) "ctrl()" function. NB: Negative return
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* values (rather than zero) indicate errors. */
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long (*dso_ctrl)(DSO *dso, int cmd, long larg, void *parg);
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/* The default DSO_METHOD-specific function for converting filenames to
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* a canonical native form. */
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DSO_NAME_CONVERTER_FUNC dso_name_converter;
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/* The default DSO_METHOD-specific function for converting filenames to
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* a canonical native form. */
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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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} DSO_METHOD;
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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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{
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DSO_METHOD *meth;
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/* Standard dlopen uses a (void *). Win32 uses a HANDLE. VMS
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* doesn't use anything but will need to cache the filename
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* for use in the dso_bind handler. All in all, let each
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* method control its own destiny. "Handles" and such go in
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* a STACK. */
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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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/* For use by applications etc ... use this for your bits'n'pieces,
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* don't touch meth_data! */
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CRYPTO_EX_DATA ex_data;
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/* If this callback function pointer is set to non-NULL, then it will
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* be 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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DSO_NAME_CONVERTER_FUNC name_converter;
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/* If this callback function pointer is set to non-NULL, then it will
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* be used in DSO_load() in place of meth->dso_merger. NB: This
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* should normally set using DSO_set_merger(). */
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DSO_MERGER_FUNC merger;
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/* This is populated with (a copy of) the platform-independant
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* filename used for this DSO. */
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char *filename;
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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
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* may involve a callback being invoked more than once not only to
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* convert to a platform-specific form, but also to try different
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* filenames in the process of trying to perform a load. As such, this
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* variable can be used to indicate (a) whether this DSO structure
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* corresponds to a loaded library or not, and (b) the filename with
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* which it was actually loaded. */
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char *loaded_filename;
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};
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DSO * DSO_new(void);
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DSO * DSO_new_method(DSO_METHOD *method);
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int DSO_free(DSO *dso);
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int DSO_flags(DSO *dso);
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int DSO_up_ref(DSO *dso);
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long DSO_ctrl(DSO *dso, int cmd, long larg, void *parg);
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/* This function sets the DSO's name_converter callback. If it is non-NULL,
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* then it will be used instead of the associated DSO_METHOD's function. If
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* oldcb is non-NULL then it is set to the function pointer value being
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* replaced. Return value is non-zero for success. */
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int DSO_set_name_converter(DSO *dso, DSO_NAME_CONVERTER_FUNC cb,
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DSO_NAME_CONVERTER_FUNC *oldcb);
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/* These functions can be used to get/set the platform-independant filename
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* used for a DSO. NB: set will fail if the DSO is already loaded. */
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const char *DSO_get_filename(DSO *dso);
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int DSO_set_filename(DSO *dso, const char *filename);
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/* This function will invoke the DSO's name_converter callback to translate a
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* filename, or if the callback isn't set it will instead use the DSO_METHOD's
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* converter. If "filename" is NULL, the "filename" in the DSO itself will be
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* used. If the DSO_FLAG_NO_NAME_TRANSLATION flag is set, then the filename is
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* simply duplicated. NB: This function is usually called from within a
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* DSO_METHOD during the processing of a DSO_load() call, and is exposed so that
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* caller-created DSO_METHODs can do the same thing. A non-NULL return value
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* will need to be OPENSSL_free()'d. */
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char *DSO_convert_filename(DSO *dso, const char *filename);
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/* This function will invoke the DSO's merger callback to merge two file
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* specifications, or if the callback isn't set it will instead use the
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* DSO_METHOD's merger. A non-NULL return value will need to be
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* OPENSSL_free()'d. */
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char *DSO_merge(DSO *dso, const char *filespec1, const char *filespec2);
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/* If the DSO is currently loaded, this returns the filename that it was loaded
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* under, otherwise it returns NULL. So it is also useful as a test as to
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* whether the DSO is currently loaded. NB: This will not necessarily return
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* the same value as DSO_convert_filename(dso, dso->filename), because the
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* DSO_METHOD's load function may have tried a variety of filenames (with
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* and/or without the aid of the converters) before settling on the one it
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* actually loaded. */
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const char *DSO_get_loaded_filename(DSO *dso);
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void DSO_set_default_method(DSO_METHOD *meth);
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DSO_METHOD *DSO_get_default_method(void);
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DSO_METHOD *DSO_get_method(DSO *dso);
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DSO_METHOD *DSO_set_method(DSO *dso, DSO_METHOD *meth);
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/* The all-singing all-dancing load function, you normally pass NULL
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* for the first and third parameters. Use DSO_up and DSO_free for
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* subsequent reference count handling. Any flags passed in will be set
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* in the constructed DSO after its init() function but before the
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* load operation. If 'dso' is non-NULL, 'flags' is ignored. */
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DSO *DSO_load(DSO *dso, const char *filename, DSO_METHOD *meth, int flags);
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/* This function binds to a variable inside a shared library. */
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void *DSO_bind_var(DSO *dso, const char *symname);
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/* This function binds to a function inside a shared library. */
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DSO_FUNC_TYPE DSO_bind_func(DSO *dso, const char *symname);
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/* This method is the default, but will beg, borrow, or steal whatever
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* method should be the default on any particular platform (including
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* DSO_METH_null() if necessary). */
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DSO_METHOD *DSO_METHOD_openssl(void);
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/* This method is defined for all platforms - if a platform has no
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* DSO support then this will be the only method! */
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DSO_METHOD *DSO_METHOD_null(void);
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/* If DSO_DLFCN is defined, the standard dlfcn.h-style functions
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* (dlopen, dlclose, dlsym, etc) will be used and incorporated into
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* this method. If not, this method will return NULL. */
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DSO_METHOD *DSO_METHOD_dlfcn(void);
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/* If DSO_DL is defined, the standard dl.h-style functions (shl_load,
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* shl_unload, shl_findsym, etc) will be used and incorporated into
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* this method. If not, this method will return NULL. */
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DSO_METHOD *DSO_METHOD_dl(void);
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/* If WIN32 is defined, use DLLs. If not, return NULL. */
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DSO_METHOD *DSO_METHOD_win32(void);
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/* If VMS is defined, use shared images. If not, return NULL. */
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DSO_METHOD *DSO_METHOD_vms(void);
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/* This function writes null-terminated pathname of DSO module
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* containing 'addr' into 'sz' large caller-provided 'path' and
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* returns the number of characters [including trailing zero]
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* written to it. If 'sz' is 0 or negative, 'path' is ignored and
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* required amount of charachers [including trailing zero] to
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* accomodate pathname is returned. If 'addr' is NULL, then
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* pathname of cryptolib itself is returned. Negative or zero
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* return value denotes error.
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*/
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int DSO_pathbyaddr(void *addr,char *path,int sz);
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/* This function should be used with caution! It looks up symbols in
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* *all* loaded modules and if module gets unloaded by somebody else
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* attempt to dereference the pointer is doomed to have fatal
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* consequences. Primary usage for this function is to probe *core*
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* system functionality, e.g. check if getnameinfo(3) is available
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* at run-time without bothering about OS-specific details such as
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* libc.so.versioning or where does it actually reside: in libc
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* itself or libsocket. */
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void *DSO_global_lookup(const char *name);
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/* If BeOS is defined, use shared images. If not, return NULL. */
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DSO_METHOD *DSO_METHOD_beos(void);
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/* BEGIN ERROR CODES */
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/* The following lines are auto generated by the script mkerr.pl. Any changes
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* made after this point may be overwritten when the script is next run.
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*/
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void ERR_load_DSO_strings(void);
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/* Error codes for the DSO functions. */
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/* Function codes. */
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#define DSO_F_BEOS_BIND_FUNC 144
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#define DSO_F_BEOS_BIND_VAR 145
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#define DSO_F_BEOS_LOAD 146
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#define DSO_F_BEOS_NAME_CONVERTER 147
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#define DSO_F_BEOS_UNLOAD 148
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#define DSO_F_DLFCN_BIND_FUNC 100
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#define DSO_F_DLFCN_BIND_VAR 101
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#define DSO_F_DLFCN_LOAD 102
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#define DSO_F_DLFCN_MERGER 130
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#define DSO_F_DLFCN_NAME_CONVERTER 123
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#define DSO_F_DLFCN_UNLOAD 103
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#define DSO_F_DL_BIND_FUNC 104
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#define DSO_F_DL_BIND_VAR 105
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#define DSO_F_DL_LOAD 106
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#define DSO_F_DL_MERGER 131
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#define DSO_F_DL_NAME_CONVERTER 124
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#define DSO_F_DL_UNLOAD 107
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#define DSO_F_DSO_BIND_FUNC 108
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#define DSO_F_DSO_BIND_VAR 109
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#define DSO_F_DSO_CONVERT_FILENAME 126
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#define DSO_F_DSO_CTRL 110
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#define DSO_F_DSO_FREE 111
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#define DSO_F_DSO_GET_FILENAME 127
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#define DSO_F_DSO_GET_LOADED_FILENAME 128
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#define DSO_F_DSO_GLOBAL_LOOKUP 139
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#define DSO_F_DSO_LOAD 112
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#define DSO_F_DSO_MERGE 132
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#define DSO_F_DSO_NEW_METHOD 113
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#define DSO_F_DSO_PATHBYADDR 140
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#define DSO_F_DSO_SET_FILENAME 129
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#define DSO_F_DSO_SET_NAME_CONVERTER 122
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#define DSO_F_DSO_UP_REF 114
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#define DSO_F_GLOBAL_LOOKUP_FUNC 138
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#define DSO_F_PATHBYADDR 137
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#define DSO_F_VMS_BIND_SYM 115
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#define DSO_F_VMS_LOAD 116
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#define DSO_F_VMS_MERGER 133
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#define DSO_F_VMS_UNLOAD 117
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#define DSO_F_WIN32_BIND_FUNC 118
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#define DSO_F_WIN32_BIND_VAR 119
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#define DSO_F_WIN32_GLOBALLOOKUP 142
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#define DSO_F_WIN32_GLOBALLOOKUP_FUNC 143
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#define DSO_F_WIN32_JOINER 135
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#define DSO_F_WIN32_LOAD 120
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#define DSO_F_WIN32_MERGER 134
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#define DSO_F_WIN32_NAME_CONVERTER 125
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#define DSO_F_WIN32_PATHBYADDR 141
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#define DSO_F_WIN32_SPLITTER 136
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#define DSO_F_WIN32_UNLOAD 121
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/* Reason codes. */
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#define DSO_R_CTRL_FAILED 100
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#define DSO_R_DSO_ALREADY_LOADED 110
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#define DSO_R_EMPTY_FILE_STRUCTURE 113
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#define DSO_R_FAILURE 114
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#define DSO_R_FILENAME_TOO_BIG 101
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#define DSO_R_FINISH_FAILED 102
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#define DSO_R_INCORRECT_FILE_SYNTAX 115
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#define DSO_R_LOAD_FAILED 103
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#define DSO_R_NAME_TRANSLATION_FAILED 109
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#define DSO_R_NO_FILENAME 111
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#define DSO_R_NO_FILE_SPECIFICATION 116
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#define DSO_R_NULL_HANDLE 104
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#define DSO_R_SET_FILENAME_FAILED 112
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#define DSO_R_STACK_ERROR 105
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#define DSO_R_SYM_FAILURE 106
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#define DSO_R_UNLOAD_FAILED 107
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#define DSO_R_UNSUPPORTED 108
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#ifdef __cplusplus
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}
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#endif
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#endif
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