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Diffstat (limited to 'libressl/include/openssl/dso.h')
| -rw-r--r-- | libressl/include/openssl/dso.h | 386 |
1 files changed, 386 insertions, 0 deletions
diff --git a/libressl/include/openssl/dso.h b/libressl/include/openssl/dso.h new file mode 100644 index 00000000..6c982c9f --- /dev/null +++ b/libressl/include/openssl/dso.h @@ -0,0 +1,386 @@ +/* $OpenBSD: dso.h,v 1.12 2016/03/15 20:50:22 krw Exp $ */ +/* 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 overridden 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 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 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 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); + + /* 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 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 + * 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); + +/* 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 + * accommodate 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); + +/* 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 |