Edit File: dso.h
/* 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
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