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EDIT :: dso.h
/* 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
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