LCOM1920-T02G10

/* dso.h -*- mode:C; c-file-style: "eay" -*- */

/*

 * Written by Geoff Thorpe (geoff@geoffthorpe.net) for the OpenSSL project

 * 2000.

 */

/* ====================================================================

 * Copyright (c) 2000 The OpenSSL Project.  All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 *

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 *

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in

 *    the documentation and/or other materials provided with the

 *    distribution.

 *

 * 3. All advertising materials mentioning features or use of this

 *    software must display the following acknowledgment:

 *    "This product includes software developed by the OpenSSL Project

 *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"

 *

 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to

 *    endorse or promote products derived from this software without

 *    prior written permission. For written permission, please contact

 *    licensing@OpenSSL.org.

 *

 * 5. Products derived from this software may not be called "OpenSSL"

 *    nor may "OpenSSL" appear in their names without prior written

 *    permission of the OpenSSL Project.

 *

 * 6. Redistributions of any form whatsoever must retain the following

 *    acknowledgment:

 *    "This product includes software developed by the OpenSSL Project

 *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"

 *

 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY

 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR

 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT

 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;

 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,

 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED

 * OF THE POSSIBILITY OF SUCH DAMAGE.

 * ====================================================================

 *

 * This product includes cryptographic software written by Eric Young

 * (eay@cryptsoft.com).  This product includes software written by Tim

 * Hudson (tjh@cryptsoft.com).

 *

 */

#ifndef HEADER_DSO_H

# define HEADER_DSO_H

# include <openssl/crypto.h>

#ifdef __cplusplus

extern "C" {

#endif

/* These values are used as commands to DSO_ctrl() */

# define DSO_CTRL_GET_FLAGS      1

# define DSO_CTRL_SET_FLAGS      2

# define DSO_CTRL_OR_FLAGS       3

/*

 * By default, DSO_load() will translate the provided filename into a form

 * typical for the platform (more specifically the DSO_METHOD) using the

 * dso_name_converter function of the method. Eg. win32 will transform "blah"

 * into "blah.dll", and dlfcn will transform it into "libblah.so". The

 * behaviour can be overriden by setting the name_converter callback in the

 * DSO object (using DSO_set_name_converter()). This callback could even

 * utilise the DSO_METHOD's converter too if it only wants to override

 * behaviour for one or two possible DSO methods. However, the following flag

 * can be set in a DSO to prevent *any* native name-translation at all - eg.

 * if the caller has prompted the user for a path to a driver library so the

 * filename should be interpreted as-is.

 */

# define DSO_FLAG_NO_NAME_TRANSLATION            0x01

/*

 * An extra flag to give if only the extension should be added as

 * translation.  This is obviously only of importance on Unix and other

 * operating systems where the translation also may prefix the name with

 * something, like 'lib', and ignored everywhere else. This flag is also

 * ignored if DSO_FLAG_NO_NAME_TRANSLATION is used at the same time.

 */

# define DSO_FLAG_NAME_TRANSLATION_EXT_ONLY      0x02

/*

 * The following flag controls the translation of symbol names to upper case.

 * This is currently only being implemented for OpenVMS.

 */

# define DSO_FLAG_UPCASE_SYMBOL                  0x10

/*

 * This flag loads the library with public symbols. Meaning: The exported

 * symbols of this library are public to all libraries loaded after this

 * library. At the moment only implemented in unix.

 */

# define DSO_FLAG_GLOBAL_SYMBOLS                 0x20

typedef void (*DSO_FUNC_TYPE) (void);

typedef struct dso_st DSO;

/*

 * The function prototype used for method functions (or caller-provided

 * callbacks) that transform filenames. They are passed a DSO structure

 * pointer (or NULL if they are to be used independantly of a DSO object) and

 * a filename to transform. They should either return NULL (if there is an

 * error condition) or a newly allocated string containing the transformed

 * form that the caller will need to free with OPENSSL_free() when done.

 */

typedef char *(*DSO_NAME_CONVERTER_FUNC)(DSO *, const char *);

/*

 * The function prototype used for method functions (or caller-provided

 * callbacks) that merge two file specifications. They are passed a DSO

 * structure pointer (or NULL if they are to be used independantly of a DSO

 * object) and two file specifications to merge. They should either return

 * NULL (if there is an error condition) or a newly allocated string

 * containing the result of merging that the caller will need to free with

 * OPENSSL_free() when done. Here, merging means that bits and pieces are

 * taken from each of the file specifications and added together in whatever

 * fashion that is sensible for the DSO method in question.  The only rule

 * that really applies is that if the two specification contain pieces of the

 * same type, the copy from the first string takes priority.  One could see

 * it as the first specification is the one given by the user and the second

 * being a bunch of defaults to add on if they're missing in the first.

 */

typedef char *(*DSO_MERGER_FUNC)(DSO *, const char *, const char *);

typedef struct dso_meth_st {

    const char *name;

    /*

     * Loads a shared library, NB: new DSO_METHODs must ensure that a

     * successful load populates the loaded_filename field, and likewise a

     * successful unload OPENSSL_frees and NULLs it out.

     */

    int (*dso_load) (DSO *dso);

    /* Unloads a shared library */

    int (*dso_unload) (DSO *dso);

    /* Binds a variable */

    void *(*dso_bind_var) (DSO *dso, const char *symname);

    /*

     * Binds a function - assumes a return type of DSO_FUNC_TYPE. This should

     * be cast to the real function prototype by the caller. Platforms that

     * don't have compatible representations for different prototypes (this

     * is possible within ANSI C) are highly unlikely to have shared

     * libraries at all, let alone a DSO_METHOD implemented for them.

     */

    DSO_FUNC_TYPE (*dso_bind_func) (DSO *dso, const char *symname);

/* I don't think this would actually be used in any circumstances. */

# if 0

    /* Unbinds a variable */

    int (*dso_unbind_var) (DSO *dso, char *symname, void *symptr);

    /* Unbinds a function */

    int (*dso_unbind_func) (DSO *dso, char *symname, DSO_FUNC_TYPE symptr);

# endif

    /*

     * The generic (yuck) "ctrl()" function. NB: Negative return values

     * (rather than zero) indicate errors.

     */

    long (*dso_ctrl) (DSO *dso, int cmd, long larg, void *parg);

    /*

     * The default DSO_METHOD-specific function for converting filenames to a

     * canonical native form.

     */

    DSO_NAME_CONVERTER_FUNC dso_name_converter;

    /*

     * The default DSO_METHOD-specific function for converting filenames to a

     * canonical native form.

     */

    DSO_MERGER_FUNC dso_merger;

    /* [De]Initialisation handlers. */

    int (*init) (DSO *dso);

    int (*finish) (DSO *dso);

    /* Return pathname of the module containing location */

    int (*pathbyaddr) (void *addr, char *path, int sz);

    /* Perform global symbol lookup, i.e. among *all* modules */

    void *(*globallookup) (const char *symname);

} DSO_METHOD;

/**********************************************************************/

/* The low-level handle type used to refer to a loaded shared library */

struct dso_st {

    DSO_METHOD *meth;

    /*

     * Standard dlopen uses a (void *). Win32 uses a HANDLE. VMS doesn't use

     * anything but will need to cache the filename for use in the dso_bind

     * handler. All in all, let each method control its own destiny.

     * "Handles" and such go in a STACK.

     */

    STACK_OF(void) *meth_data;

    int references;

    int flags;

    /*

     * For use by applications etc ... use this for your bits'n'pieces, don't

     * touch meth_data!

     */

    CRYPTO_EX_DATA ex_data;

    /*

     * If this callback function pointer is set to non-NULL, then it will be

     * used in DSO_load() in place of meth->dso_name_converter. NB: This

     * should normally set using DSO_set_name_converter().

     */

    DSO_NAME_CONVERTER_FUNC name_converter;

    /*

     * If this callback function pointer is set to non-NULL, then it will be

     * used in DSO_load() in place of meth->dso_merger. NB: This should

     * normally set using DSO_set_merger().

     */

    DSO_MERGER_FUNC merger;

    /*

     * This is populated with (a copy of) the platform-independant filename

     * used for this DSO.

     */

    char *filename;

    /*

     * This is populated with (a copy of) the translated filename by which

     * the DSO was actually loaded. It is NULL iff the DSO is not currently

     * loaded. NB: This is here because the filename translation process may

     * involve a callback being invoked more than once not only to convert to

     * a platform-specific form, but also to try different filenames in the

     * process of trying to perform a load. As such, this variable can be

     * used to indicate (a) whether this DSO structure corresponds to a

     * loaded library or not, and (b) the filename with which it was actually

     * loaded.

     */

    char *loaded_filename;

};

DSO *DSO_new(void);

DSO *DSO_new_method(DSO_METHOD *method);

int DSO_free(DSO *dso);

int DSO_flags(DSO *dso);

int DSO_up_ref(DSO *dso);

long DSO_ctrl(DSO *dso, int cmd, long larg, void *parg);

/*

 * This function sets the DSO's name_converter callback. If it is non-NULL,

 * then it will be used instead of the associated DSO_METHOD's function. If

 * oldcb is non-NULL then it is set to the function pointer value being

 * replaced. Return value is non-zero for success.

 */

int DSO_set_name_converter(DSO *dso, DSO_NAME_CONVERTER_FUNC cb,

                           DSO_NAME_CONVERTER_FUNC *oldcb);

/*

 * These functions can be used to get/set the platform-independant filename

 * used for a DSO. NB: set will fail if the DSO is already loaded.

 */

const char *DSO_get_filename(DSO *dso);

int DSO_set_filename(DSO *dso, const char *filename);

/*

 * This function will invoke the DSO's name_converter callback to translate a

 * filename, or if the callback isn't set it will instead use the DSO_METHOD's

 * converter. If "filename" is NULL, the "filename" in the DSO itself will be

 * used. If the DSO_FLAG_NO_NAME_TRANSLATION flag is set, then the filename is

 * simply duplicated. NB: This function is usually called from within a

 * DSO_METHOD during the processing of a DSO_load() call, and is exposed so

 * that caller-created DSO_METHODs can do the same thing. A non-NULL return

 * value will need to be OPENSSL_free()'d.

 */

char *DSO_convert_filename(DSO *dso, const char *filename);

/*

 * This function will invoke the DSO's merger callback to merge two file

 * specifications, or if the callback isn't set it will instead use the

 * DSO_METHOD's merger.  A non-NULL return value will need to be

 * OPENSSL_free()'d.

 */

char *DSO_merge(DSO *dso, const char *filespec1, const char *filespec2);

/*

 * If the DSO is currently loaded, this returns the filename that it was

 * loaded under, otherwise it returns NULL. So it is also useful as a test as

 * to whether the DSO is currently loaded. NB: This will not necessarily

 * return the same value as DSO_convert_filename(dso, dso->filename), because

 * the DSO_METHOD's load function may have tried a variety of filenames (with

 * and/or without the aid of the converters) before settling on the one it

 * actually loaded.

 */

const char *DSO_get_loaded_filename(DSO *dso);

void DSO_set_default_method(DSO_METHOD *meth);

DSO_METHOD *DSO_get_default_method(void);

DSO_METHOD *DSO_get_method(DSO *dso);

DSO_METHOD *DSO_set_method(DSO *dso, DSO_METHOD *meth);

/*

 * The all-singing all-dancing load function, you normally pass NULL for the

 * first and third parameters. Use DSO_up and DSO_free for subsequent

 * reference count handling. Any flags passed in will be set in the

 * constructed DSO after its init() function but before the load operation.

 * If 'dso' is non-NULL, 'flags' is ignored.

 */

DSO *DSO_load(DSO *dso, const char *filename, DSO_METHOD *meth, int flags);

/* This function binds to a variable inside a shared library. */

void *DSO_bind_var(DSO *dso, const char *symname);

/* This function binds to a function inside a shared library. */

DSO_FUNC_TYPE DSO_bind_func(DSO *dso, const char *symname);

/*

 * This method is the default, but will beg, borrow, or steal whatever method

 * should be the default on any particular platform (including

 * DSO_METH_null() if necessary).

 */

DSO_METHOD *DSO_METHOD_openssl(void);

/*

 * This method is defined for all platforms - if a platform has no DSO

 * support then this will be the only method!

 */

DSO_METHOD *DSO_METHOD_null(void);

/*

 * If DSO_DLFCN is defined, the standard dlfcn.h-style functions (dlopen,

 * dlclose, dlsym, etc) will be used and incorporated into this method. If

 * not, this method will return NULL.

 */

DSO_METHOD *DSO_METHOD_dlfcn(void);

/*

 * If DSO_DL is defined, the standard dl.h-style functions (shl_load,

 * shl_unload, shl_findsym, etc) will be used and incorporated into this

 * method. If not, this method will return NULL.

 */

DSO_METHOD *DSO_METHOD_dl(void);

/* If WIN32 is defined, use DLLs. If not, return NULL. */

DSO_METHOD *DSO_METHOD_win32(void);

/* If VMS is defined, use shared images. If not, return NULL. */

DSO_METHOD *DSO_METHOD_vms(void);

/*

 * This function writes null-terminated pathname of DSO module containing

 * 'addr' into 'sz' large caller-provided 'path' and returns the number of

 * characters [including trailing zero] written to it. If 'sz' is 0 or

 * negative, 'path' is ignored and required amount of charachers [including

 * trailing zero] to accomodate pathname is returned. If 'addr' is NULL, then

 * pathname of cryptolib itself is returned. Negative or zero return value

 * denotes error.

 */

int DSO_pathbyaddr(void *addr, char *path, int sz);

/*

 * This function should be used with caution! It looks up symbols in *all*

 * loaded modules and if module gets unloaded by somebody else attempt to

 * dereference the pointer is doomed to have fatal consequences. Primary

 * usage for this function is to probe *core* system functionality, e.g.

 * check if getnameinfo(3) is available at run-time without bothering about

 * OS-specific details such as libc.so.versioning or where does it actually

 * reside: in libc itself or libsocket.

 */

void *DSO_global_lookup(const char *name);

/* If BeOS is defined, use shared images. If not, return NULL. */

DSO_METHOD *DSO_METHOD_beos(void);

/* BEGIN ERROR CODES */

/*

 * The following lines are auto generated by the script mkerr.pl. Any changes

 * made after this point may be overwritten when the script is next run.

 */

void ERR_load_DSO_strings(void);

/* Error codes for the DSO functions. */

/* Function codes. */

# define DSO_F_BEOS_BIND_FUNC                             144

# define DSO_F_BEOS_BIND_VAR                              145

# define DSO_F_BEOS_LOAD                                  146

# define DSO_F_BEOS_NAME_CONVERTER                        147

# define DSO_F_BEOS_UNLOAD                                148

# define DSO_F_DLFCN_BIND_FUNC                            100

# define DSO_F_DLFCN_BIND_VAR                             101

# define DSO_F_DLFCN_LOAD                                 102

# define DSO_F_DLFCN_MERGER                               130

# define DSO_F_DLFCN_NAME_CONVERTER                       123

# define DSO_F_DLFCN_UNLOAD                               103

# define DSO_F_DL_BIND_FUNC                               104

# define DSO_F_DL_BIND_VAR                                105

# define DSO_F_DL_LOAD                                    106

# define DSO_F_DL_MERGER                                  131

# define DSO_F_DL_NAME_CONVERTER                          124

# define DSO_F_DL_UNLOAD                                  107

# define DSO_F_DSO_BIND_FUNC                              108

# define DSO_F_DSO_BIND_VAR                               109

# define DSO_F_DSO_CONVERT_FILENAME                       126

# define DSO_F_DSO_CTRL                                   110

# define DSO_F_DSO_FREE                                   111

# define DSO_F_DSO_GET_FILENAME                           127

# define DSO_F_DSO_GET_LOADED_FILENAME                    128

# define DSO_F_DSO_GLOBAL_LOOKUP                          139

# define DSO_F_DSO_LOAD                                   112

# define DSO_F_DSO_MERGE                                  132

# define DSO_F_DSO_NEW_METHOD                             113

# define DSO_F_DSO_PATHBYADDR                             140

# define DSO_F_DSO_SET_FILENAME                           129

# define DSO_F_DSO_SET_NAME_CONVERTER                     122

# define DSO_F_DSO_UP_REF                                 114

# define DSO_F_GLOBAL_LOOKUP_FUNC                         138

# define DSO_F_PATHBYADDR                                 137

# define DSO_F_VMS_BIND_SYM                               115

# define DSO_F_VMS_LOAD                                   116

# define DSO_F_VMS_MERGER                                 133

# define DSO_F_VMS_UNLOAD                                 117

# define DSO_F_WIN32_BIND_FUNC                            118

# define DSO_F_WIN32_BIND_VAR                             119

# define DSO_F_WIN32_GLOBALLOOKUP                         142

# define DSO_F_WIN32_GLOBALLOOKUP_FUNC                    143

# define DSO_F_WIN32_JOINER                               135

# define DSO_F_WIN32_LOAD                                 120

# define DSO_F_WIN32_MERGER                               134

# define DSO_F_WIN32_NAME_CONVERTER                       125

# define DSO_F_WIN32_PATHBYADDR                           141

# define DSO_F_WIN32_SPLITTER                             136

# define DSO_F_WIN32_UNLOAD                               121

/* Reason codes. */

# define DSO_R_CTRL_FAILED                                100

# define DSO_R_DSO_ALREADY_LOADED                         110

# define DSO_R_EMPTY_FILE_STRUCTURE                       113

# define DSO_R_FAILURE                                    114

# define DSO_R_FILENAME_TOO_BIG                           101

# define DSO_R_FINISH_FAILED                              102

# define DSO_R_INCORRECT_FILE_SYNTAX                      115

# define DSO_R_LOAD_FAILED                                103

# define DSO_R_NAME_TRANSLATION_FAILED                    109

# define DSO_R_NO_FILENAME                                111

# define DSO_R_NO_FILE_SPECIFICATION                      116

# define DSO_R_NULL_HANDLE                                104

# define DSO_R_SET_FILENAME_FAILED                        112

# define DSO_R_STACK_ERROR                                105

# define DSO_R_SYM_FAILURE                                106

# define DSO_R_UNLOAD_FAILED                              107

# define DSO_R_UNSUPPORTED                                108

#ifdef  __cplusplus

}

#endif

#endif