451 lines
20 KiB
C++
451 lines
20 KiB
C++
/* dso.h */
|
|
/*
|
|
* 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
|