crypto/openssl-0.9.7e/crypto/dso/dso.h

   1 /* dso.h */
   2 /* Written by Geoff Thorpe (geoff@geoffthorpe.net) for the OpenSSL
   3  * project 2000.
   4  */
   5 /* ====================================================================
   6  * Copyright (c) 2000 The OpenSSL Project.  All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  *
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  *
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in
  17  *    the documentation and/or other materials provided with the
  18  *    distribution.
  19  *
  20  * 3. All advertising materials mentioning features or use of this
  21  *    software must display the following acknowledgment:
  22  *    "This product includes software developed by the OpenSSL Project
  23  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  24  *
  25  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  26  *    endorse or promote products derived from this software without
  27  *    prior written permission. For written permission, please contact
  28  *    licensing@OpenSSL.org.
  29  *
  30  * 5. Products derived from this software may not be called "OpenSSL"
  31  *    nor may "OpenSSL" appear in their names without prior written
  32  *    permission of the OpenSSL Project.
  33  *
  34  * 6. Redistributions of any form whatsoever must retain the following
  35  *    acknowledgment:
  36  *    "This product includes software developed by the OpenSSL Project
  37  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  38  *
  39  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  40  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  41  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  42  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  43  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  44  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  45  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  46  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  47  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  48  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  49  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  50  * OF THE POSSIBILITY OF SUCH DAMAGE.
  51  * ====================================================================
  52  *
  53  * This product includes cryptographic software written by Eric Young
  54  * (eay@cryptsoft.com).  This product includes software written by Tim
  55  * Hudson (tjh@cryptsoft.com).
  56  *
  57  */
  58
  59 #ifndef HEADER_DSO_H
  60 #define HEADER_DSO_H
  61
  62 #include <openssl/crypto.h>
  63
  64 #ifdef __cplusplus
  65 extern "C" {
  66 #endif
  67
  68 /* These values are used as commands to DSO_ctrl() */
  69 #define DSO_CTRL_GET_FLAGS      1
  70 #define DSO_CTRL_SET_FLAGS      2
  71 #define DSO_CTRL_OR_FLAGS       3
  72
  73 /* By default, DSO_load() will translate the provided filename into a form
  74  * typical for the platform (more specifically the DSO_METHOD) using the
  75  * dso_name_converter function of the method. Eg. win32 will transform "blah"
  76  * into "blah.dll", and dlfcn will transform it into "libblah.so". The
  77  * behaviour can be overriden by setting the name_converter callback in the DSO
  78  * object (using DSO_set_name_converter()). This callback could even utilise
  79  * the DSO_METHOD's converter too if it only wants to override behaviour for
  80  * one or two possible DSO methods. However, the following flag can be set in a
  81  * DSO to prevent *any* native name-translation at all - eg. if the caller has
  82  * prompted the user for a path to a driver library so the filename should be
  83  * interpreted as-is. */
  84 #define DSO_FLAG_NO_NAME_TRANSLATION            0x01
  85 /* An extra flag to give if only the extension should be added as
  86  * translation.  This is obviously only of importance on Unix and
  87  * other operating systems where the translation also may prefix
  88  * the name with something, like 'lib', and ignored everywhere else.
  89  * This flag is also ignored if DSO_FLAG_NO_NAME_TRANSLATION is used
  90  * at the same time. */
  91 #define DSO_FLAG_NAME_TRANSLATION_EXT_ONLY      0x02
  92
  93 /* The following flag controls the translation of symbol names to upper
  94  * case.  This is currently only being implemented for OpenVMS.
  95  */
  96 #define DSO_FLAG_UPCASE_SYMBOL                  0x10
  97
  98
  99 typedef void (*DSO_FUNC_TYPE)(void);
 100
 101 typedef struct dso_st DSO;
 102
 103 /* The function prototype used for method functions (or caller-provided
 104  * callbacks) that transform filenames. They are passed a DSO structure pointer
 105  * (or NULL if they are to be used independantly of a DSO object) and a
 106  * filename to transform. They should either return NULL (if there is an error
 107  * condition) or a newly allocated string containing the transformed form that
 108  * the caller will need to free with OPENSSL_free() when done. */
 109 typedef char* (*DSO_NAME_CONVERTER_FUNC)(DSO *, const char *);
 110
 111 typedef struct dso_meth_st
 112         {
 113         const char *name;
 114         /* Loads a shared library, NB: new DSO_METHODs must ensure that a
 115          * successful load populates the loaded_filename field, and likewise a
 116          * successful unload OPENSSL_frees and NULLs it out. */
 117         int (*dso_load)(DSO *dso);
 118         /* Unloads a shared library */
 119         int (*dso_unload)(DSO *dso);
 120         /* Binds a variable */
 121         void *(*dso_bind_var)(DSO *dso, const char *symname);
 122         /* Binds a function - assumes a return type of DSO_FUNC_TYPE.
 123          * This should be cast to the real function prototype by the
 124          * caller. Platforms that don't have compatible representations
 125          * for different prototypes (this is possible within ANSI C)
 126          * are highly unlikely to have shared libraries at all, let
 127          * alone a DSO_METHOD implemented for them. */
 128         DSO_FUNC_TYPE (*dso_bind_func)(DSO *dso, const char *symname);
 129
 130 /* I don't think this would actually be used in any circumstances. */
 131 #if 0
 132         /* Unbinds a variable */
 133         int (*dso_unbind_var)(DSO *dso, char *symname, void *symptr);
 134         /* Unbinds a function */
 135         int (*dso_unbind_func)(DSO *dso, char *symname, DSO_FUNC_TYPE symptr);
 136 #endif
 137         /* The generic (yuck) "ctrl()" function. NB: Negative return
 138          * values (rather than zero) indicate errors. */
 139         long (*dso_ctrl)(DSO *dso, int cmd, long larg, void *parg);
 140         /* The default DSO_METHOD-specific function for converting filenames to
 141          * a canonical native form. */
 142         DSO_NAME_CONVERTER_FUNC dso_name_converter;
 143
 144         /* [De]Initialisation handlers. */
 145         int (*init)(DSO *dso);
 146         int (*finish)(DSO *dso);
 147         } DSO_METHOD;
 148
 149 /**********************************************************************/
 150 /* The low-level handle type used to refer to a loaded shared library */
 151
 152 struct dso_st
 153         {
 154         DSO_METHOD *meth;
 155         /* Standard dlopen uses a (void *). Win32 uses a HANDLE. VMS
 156          * doesn't use anything but will need to cache the filename
 157          * for use in the dso_bind handler. All in all, let each
 158          * method control its own destiny. "Handles" and such go in
 159          * a STACK. */
 160         STACK *meth_data;
 161         int references;
 162         int flags;
 163         /* For use by applications etc ... use this for your bits'n'pieces,
 164          * don't touch meth_data! */
 165         CRYPTO_EX_DATA ex_data;
 166         /* If this callback function pointer is set to non-NULL, then it will
 167          * be used on DSO_load() in place of meth->dso_name_converter. NB: This
 168          * should normally set using DSO_set_name_converter(). */
 169         DSO_NAME_CONVERTER_FUNC name_converter;
 170         /* This is populated with (a copy of) the platform-independant
 171          * filename used for this DSO. */
 172         char *filename;
 173         /* This is populated with (a copy of) the translated filename by which
 174          * the DSO was actually loaded. It is NULL iff the DSO is not currently
 175          * loaded. NB: This is here because the filename translation process
 176          * may involve a callback being invoked more than once not only to
 177          * convert to a platform-specific form, but also to try different
 178          * filenames in the process of trying to perform a load. As such, this
 179          * variable can be used to indicate (a) whether this DSO structure
 180          * corresponds to a loaded library or not, and (b) the filename with
 181          * which it was actually loaded. */
 182         char *loaded_filename;
 183         };
 184
 185
 186 DSO *   DSO_new(void);
 187 DSO *   DSO_new_method(DSO_METHOD *method);
 188 int     DSO_free(DSO *dso);
 189 int     DSO_flags(DSO *dso);
 190 int     DSO_up_ref(DSO *dso);
 191 long    DSO_ctrl(DSO *dso, int cmd, long larg, void *parg);
 192
 193 /* This function sets the DSO's name_converter callback. If it is non-NULL,
 194  * then it will be used instead of the associated DSO_METHOD's function. If
 195  * oldcb is non-NULL then it is set to the function pointer value being
 196  * replaced. Return value is non-zero for success. */
 197 int     DSO_set_name_converter(DSO *dso, DSO_NAME_CONVERTER_FUNC cb,
 198                                 DSO_NAME_CONVERTER_FUNC *oldcb);
 199 /* These functions can be used to get/set the platform-independant filename
 200  * used for a DSO. NB: set will fail if the DSO is already loaded. */
 201 const char *DSO_get_filename(DSO *dso);
 202 int     DSO_set_filename(DSO *dso, const char *filename);
 203 /* This function will invoke the DSO's name_converter callback to translate a
 204  * filename, or if the callback isn't set it will instead use the DSO_METHOD's
 205  * converter. If "filename" is NULL, the "filename" in the DSO itself will be
 206  * used. If the DSO_FLAG_NO_NAME_TRANSLATION flag is set, then the filename is
 207  * simply duplicated. NB: This function is usually called from within a
 208  * DSO_METHOD during the processing of a DSO_load() call, and is exposed so that
 209  * caller-created DSO_METHODs can do the same thing. A non-NULL return value
 210  * will need to be OPENSSL_free()'d. */
 211 char    *DSO_convert_filename(DSO *dso, const char *filename);
 212 /* If the DSO is currently loaded, this returns the filename that it was loaded
 213  * under, otherwise it returns NULL. So it is also useful as a test as to
 214  * whether the DSO is currently loaded. NB: This will not necessarily return
 215  * the same value as DSO_convert_filename(dso, dso->filename), because the
 216  * DSO_METHOD's load function may have tried a variety of filenames (with
 217  * and/or without the aid of the converters) before settling on the one it
 218  * actually loaded. */
 219 const char *DSO_get_loaded_filename(DSO *dso);
 220
 221 void    DSO_set_default_method(DSO_METHOD *meth);
 222 DSO_METHOD *DSO_get_default_method(void);
 223 DSO_METHOD *DSO_get_method(DSO *dso);
 224 DSO_METHOD *DSO_set_method(DSO *dso, DSO_METHOD *meth);
 225
 226 /* The all-singing all-dancing load function, you normally pass NULL
 227  * for the first and third parameters. Use DSO_up and DSO_free for
 228  * subsequent reference count handling. Any flags passed in will be set
 229  * in the constructed DSO after its init() function but before the
 230  * load operation. If 'dso' is non-NULL, 'flags' is ignored. */
 231 DSO *DSO_load(DSO *dso, const char *filename, DSO_METHOD *meth, int flags);
 232
 233 /* This function binds to a variable inside a shared library. */
 234 void *DSO_bind_var(DSO *dso, const char *symname);
 235
 236 /* This function binds to a function inside a shared library. */
 237 DSO_FUNC_TYPE DSO_bind_func(DSO *dso, const char *symname);
 238
 239 /* This method is the default, but will beg, borrow, or steal whatever
 240  * method should be the default on any particular platform (including
 241  * DSO_METH_null() if necessary). */
 242 DSO_METHOD *DSO_METHOD_openssl(void);
 243
 244 /* This method is defined for all platforms - if a platform has no
 245  * DSO support then this will be the only method! */
 246 DSO_METHOD *DSO_METHOD_null(void);
 247
 248 /* If DSO_DLFCN is defined, the standard dlfcn.h-style functions
 249  * (dlopen, dlclose, dlsym, etc) will be used and incorporated into
 250  * this method. If not, this method will return NULL. */
 251 DSO_METHOD *DSO_METHOD_dlfcn(void);
 252
 253 /* If DSO_DL is defined, the standard dl.h-style functions (shl_load,
 254  * shl_unload, shl_findsym, etc) will be used and incorporated into
 255  * this method. If not, this method will return NULL. */
 256 DSO_METHOD *DSO_METHOD_dl(void);
 257
 258 /* If WIN32 is defined, use DLLs. If not, return NULL. */
 259 DSO_METHOD *DSO_METHOD_win32(void);
 260
 261 /* If VMS is defined, use shared images. If not, return NULL. */
 262 DSO_METHOD *DSO_METHOD_vms(void);
 263
 264 /* BEGIN ERROR CODES */
 265 /* The following lines are auto generated by the script mkerr.pl. Any changes
 266  * made after this point may be overwritten when the script is next run.
 267  */
 268 void ERR_load_DSO_strings(void);
 269
 270 /* Error codes for the DSO functions. */
 271
 272 /* Function codes. */
 273 #define DSO_F_DLFCN_BIND_FUNC                            100
 274 #define DSO_F_DLFCN_BIND_VAR                             101
 275 #define DSO_F_DLFCN_LOAD                                 102
 276 #define DSO_F_DLFCN_NAME_CONVERTER                       123
 277 #define DSO_F_DLFCN_UNLOAD                               103
 278 #define DSO_F_DL_BIND_FUNC                               104
 279 #define DSO_F_DL_BIND_VAR                                105
 280 #define DSO_F_DL_LOAD                                    106
 281 #define DSO_F_DL_NAME_CONVERTER                          124
 282 #define DSO_F_DL_UNLOAD                                  107
 283 #define DSO_F_DSO_BIND_FUNC                              108
 284 #define DSO_F_DSO_BIND_VAR                               109
 285 #define DSO_F_DSO_CONVERT_FILENAME                       126
 286 #define DSO_F_DSO_CTRL                                   110
 287 #define DSO_F_DSO_FREE                                   111
 288 #define DSO_F_DSO_GET_FILENAME                           127
 289 #define DSO_F_DSO_GET_LOADED_FILENAME                    128
 290 #define DSO_F_DSO_LOAD                                   112
 291 #define DSO_F_DSO_NEW_METHOD                             113
 292 #define DSO_F_DSO_SET_FILENAME                           129
 293 #define DSO_F_DSO_SET_NAME_CONVERTER                     122
 294 #define DSO_F_DSO_UP_REF                                 114
 295 #define DSO_F_VMS_BIND_VAR                               115
 296 #define DSO_F_VMS_LOAD                                   116
 297 #define DSO_F_VMS_UNLOAD                                 117
 298 #define DSO_F_WIN32_BIND_FUNC                            118
 299 #define DSO_F_WIN32_BIND_VAR                             119
 300 #define DSO_F_WIN32_LOAD                                 120
 301 #define DSO_F_WIN32_NAME_CONVERTER                       125
 302 #define DSO_F_WIN32_UNLOAD                               121
 303
 304 /* Reason codes. */
 305 #define DSO_R_CTRL_FAILED                                100
 306 #define DSO_R_DSO_ALREADY_LOADED                         110
 307 #define DSO_R_FILENAME_TOO_BIG                           101
 308 #define DSO_R_FINISH_FAILED                              102
 309 #define DSO_R_LOAD_FAILED                                103
 310 #define DSO_R_NAME_TRANSLATION_FAILED                    109
 311 #define DSO_R_NO_FILENAME                                111
 312 #define DSO_R_NULL_HANDLE                                104
 313 #define DSO_R_SET_FILENAME_FAILED                        112
 314 #define DSO_R_STACK_ERROR                                105
 315 #define DSO_R_SYM_FAILURE                                106
 316 #define DSO_R_UNLOAD_FAILED                              107
 317 #define DSO_R_UNSUPPORTED                                108
 318
 319 #ifdef  __cplusplus
 320 }
 321 #endif
 322 #endif