451 lines
20 KiB
C
451 lines
20 KiB
C
/* dso.h */
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/*
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* Written by Geoff Thorpe (geoff@geoffthorpe.net) for the OpenSSL project
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* 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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/*
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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
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* DSO object (using DSO_set_name_converter()). This callback could even
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* utilise the DSO_METHOD's converter too if it only wants to override
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* behaviour for one or two possible DSO methods. However, the following flag
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* can be set in a DSO to prevent *any* native name-translation at all - eg.
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* if the caller has prompted the user for a path to a driver library so the
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* filename should be interpreted as-is.
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*/
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# define DSO_FLAG_NO_NAME_TRANSLATION 0x01
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/*
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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 other
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* operating systems where the translation also may prefix the name with
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* something, like 'lib', and ignored everywhere else. This flag is also
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* ignored if DSO_FLAG_NO_NAME_TRANSLATION is used at the same time.
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*/
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# define DSO_FLAG_NAME_TRANSLATION_EXT_ONLY 0x02
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/*
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* The following flag controls the translation of symbol names to upper case.
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* 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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/*
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* This flag loads the library with public symbols. Meaning: The exported
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* symbols of this library are public to all libraries loaded after this
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* library. 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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/*
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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
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* pointer (or NULL if they are to be used independantly of a DSO object) and
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* a filename to transform. They should either return NULL (if there is an
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* error condition) or a newly allocated string containing the transformed
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* form that the caller will need to free with OPENSSL_free() when done.
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*/
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typedef char *(*DSO_NAME_CONVERTER_FUNC)(DSO *, const char *);
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/*
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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 DSO
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* structure pointer (or NULL if they are to be used independantly of a DSO
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* object) and two file specifications to merge. They should either return
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* NULL (if there is an error condition) or a newly allocated string
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* containing the result of merging that the caller will need to free with
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* OPENSSL_free() when done. Here, merging means that bits and pieces are
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* taken from each of the file specifications and added together in whatever
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* fashion that is sensible for the DSO method in question. The only rule
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* that really applies is that if the two specification contain pieces of the
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* same 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 second
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* being a bunch of defaults to add on if they're missing in the first.
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*/
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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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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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/* Binds a variable */
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void *(*dso_bind_var) (DSO *dso, const char *symname);
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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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/* 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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/*
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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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} 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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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-independant 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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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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/*
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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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*/
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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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/*
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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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*/
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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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/*
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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
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* that caller-created DSO_METHODs can do the same thing. A non-NULL return
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* value will need to be OPENSSL_free()'d.
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*/
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char *DSO_convert_filename(DSO *dso, const char *filename);
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/*
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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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*/
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char *DSO_merge(DSO *dso, const char *filespec1, const char *filespec2);
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/*
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* If the DSO is currently loaded, this returns the filename that it was
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* loaded under, otherwise it returns NULL. So it is also useful as a test as
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* to whether the DSO is currently loaded. NB: This will not necessarily
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* return the same value as DSO_convert_filename(dso, dso->filename), because
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* the 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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*/
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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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/*
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* The all-singing all-dancing load function, you normally pass NULL for the
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* first and third parameters. Use DSO_up and DSO_free for subsequent
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* reference count handling. Any flags passed in will be set in the
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* constructed DSO after its init() function but before the load operation.
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* If 'dso' is non-NULL, 'flags' is ignored.
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*/
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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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/*
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* This method is the default, but will beg, borrow, or steal whatever method
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* should be the default on any particular platform (including
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* DSO_METH_null() if necessary).
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*/
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DSO_METHOD *DSO_METHOD_openssl(void);
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/*
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* This method is defined for all platforms - if a platform has no DSO
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* support then this will be the only method!
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*/
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DSO_METHOD *DSO_METHOD_null(void);
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/*
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* If DSO_DLFCN is defined, the standard dlfcn.h-style functions (dlopen,
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* dlclose, dlsym, etc) will be used and incorporated into this method. If
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* not, this method will return NULL.
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*/
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DSO_METHOD *DSO_METHOD_dlfcn(void);
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/*
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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 this
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* method. If not, this method will return NULL.
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*/
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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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/*
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* This function writes null-terminated pathname of DSO module containing
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* 'addr' into 'sz' large caller-provided 'path' and returns the number of
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* characters [including trailing zero] written to it. If 'sz' is 0 or
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* negative, 'path' is ignored and required amount of charachers [including
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* trailing zero] to accomodate pathname is returned. If 'addr' is NULL, then
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* pathname of cryptolib itself is returned. Negative or zero return value
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* denotes error.
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*/
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int DSO_pathbyaddr(void *addr, char *path, int sz);
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/*
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* This function should be used with caution! It looks up symbols in *all*
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* loaded modules and if module gets unloaded by somebody else attempt to
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* dereference the pointer is doomed to have fatal consequences. Primary
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* usage for this function is to probe *core* system functionality, e.g.
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* check if getnameinfo(3) is available at run-time without bothering about
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* OS-specific details such as libc.so.versioning or where does it actually
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* reside: in libc itself or libsocket.
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*/
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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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/*
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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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