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165 lines
7 KiB
C
165 lines
7 KiB
C
/*
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* Copyright 2000-2018 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the OpenSSL license (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#ifndef HEADER_DSO_H
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# define HEADER_DSO_H
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# include <openssl/crypto.h>
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# include "internal/dsoerr.h"
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/* These values are used as commands to DSO_ctrl() */
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# define DSO_CTRL_GET_FLAGS 1
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# define DSO_CTRL_SET_FLAGS 2
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# define DSO_CTRL_OR_FLAGS 3
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/*
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* By default, DSO_load() will translate the provided filename into a form
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* typical for the platform using the dso_name_converter function of the
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* method. Eg. win32 will transform "blah" into "blah.dll", and dlfcn will
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* transform it into "libblah.so". This callback could even utilise the
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* DSO_METHOD's converter too if it only wants to override behaviour for
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* one or two possible DSO methods. However, the following flag can be
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* set in a DSO to prevent *any* native name-translation at all - eg. if
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* the caller has prompted the user for a path to a driver library so the
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* filename should be interpreted as-is.
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*/
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# define DSO_FLAG_NO_NAME_TRANSLATION 0x01
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/*
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* An extra flag to give if only the extension should be added as
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* translation. This is obviously only of importance on Unix and other
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* operating systems where the translation also may prefix the name with
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* something, like 'lib', and ignored everywhere else. This flag is also
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* ignored if DSO_FLAG_NO_NAME_TRANSLATION is used at the same time.
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*/
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# define DSO_FLAG_NAME_TRANSLATION_EXT_ONLY 0x02
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/*
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* Don't unload the DSO when we call DSO_free()
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*/
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# define DSO_FLAG_NO_UNLOAD_ON_FREE 0x04
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/*
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* This flag loads the library with public symbols. Meaning: The exported
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* symbols of this library are public to all libraries loaded after this
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* library. At the moment only implemented in unix.
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*/
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# define DSO_FLAG_GLOBAL_SYMBOLS 0x20
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typedef void (*DSO_FUNC_TYPE) (void);
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typedef struct dso_st DSO;
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typedef struct dso_meth_st DSO_METHOD;
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/*
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* The function prototype used for method functions (or caller-provided
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* callbacks) that transform filenames. They are passed a DSO structure
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* pointer (or NULL if they are to be used independently of a DSO object) and
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* a filename to transform. They should either return NULL (if there is an
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* error condition) or a newly allocated string containing the transformed
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* form that the caller will need to free with OPENSSL_free() when done.
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*/
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typedef char *(*DSO_NAME_CONVERTER_FUNC)(DSO *, const char *);
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/*
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* The function prototype used for method functions (or caller-provided
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* callbacks) that merge two file specifications. They are passed a DSO
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* structure pointer (or NULL if they are to be used independently of a DSO
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* object) and two file specifications to merge. They should either return
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* NULL (if there is an error condition) or a newly allocated string
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* containing the result of merging that the caller will need to free with
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* OPENSSL_free() when done. Here, merging means that bits and pieces are
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* taken from each of the file specifications and added together in whatever
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* fashion that is sensible for the DSO method in question. The only rule
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* that really applies is that if the two specification contain pieces of the
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* same type, the copy from the first string takes priority. One could see
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* it as the first specification is the one given by the user and the second
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* being a bunch of defaults to add on if they're missing in the first.
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*/
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typedef char *(*DSO_MERGER_FUNC)(DSO *, const char *, const char *);
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DSO *DSO_new(void);
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int DSO_free(DSO *dso);
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int DSO_flags(DSO *dso);
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int DSO_up_ref(DSO *dso);
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long DSO_ctrl(DSO *dso, int cmd, long larg, void *parg);
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/*
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* These functions can be used to get/set the platform-independent filename
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* used for a DSO. NB: set will fail if the DSO is already loaded.
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*/
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const char *DSO_get_filename(DSO *dso);
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int DSO_set_filename(DSO *dso, const char *filename);
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/*
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* This function will invoke the DSO's name_converter callback to translate a
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* filename, or if the callback isn't set it will instead use the DSO_METHOD's
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* converter. If "filename" is NULL, the "filename" in the DSO itself will be
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* used. If the DSO_FLAG_NO_NAME_TRANSLATION flag is set, then the filename is
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* simply duplicated. NB: This function is usually called from within a
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* DSO_METHOD during the processing of a DSO_load() call, and is exposed so
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* that caller-created DSO_METHODs can do the same thing. A non-NULL return
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* value will need to be OPENSSL_free()'d.
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*/
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char *DSO_convert_filename(DSO *dso, const char *filename);
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/*
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* This function will invoke the DSO's merger callback to merge two file
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* specifications, or if the callback isn't set it will instead use the
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* DSO_METHOD's merger. A non-NULL return value will need to be
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* OPENSSL_free()'d.
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*/
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char *DSO_merge(DSO *dso, const char *filespec1, const char *filespec2);
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/*
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* The all-singing all-dancing load function, you normally pass NULL for the
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* first and third parameters. Use DSO_up_ref and DSO_free for subsequent
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* reference count handling. Any flags passed in will be set in the
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* constructed DSO after its init() function but before the load operation.
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* If 'dso' is non-NULL, 'flags' is ignored.
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*/
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DSO *DSO_load(DSO *dso, const char *filename, DSO_METHOD *meth, int flags);
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/* This function binds to a function inside a shared library. */
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DSO_FUNC_TYPE DSO_bind_func(DSO *dso, const char *symname);
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/*
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* This method is the default, but will beg, borrow, or steal whatever method
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* should be the default on any particular platform (including
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* DSO_METH_null() if necessary).
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*/
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DSO_METHOD *DSO_METHOD_openssl(void);
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/*
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* This function writes null-terminated pathname of DSO module containing
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* 'addr' into 'sz' large caller-provided 'path' and returns the number of
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* characters [including trailing zero] written to it. If 'sz' is 0 or
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* negative, 'path' is ignored and required amount of characters [including
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* trailing zero] to accommodate pathname is returned. If 'addr' is NULL, then
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* pathname of cryptolib itself is returned. Negative or zero return value
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* denotes error.
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*/
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int DSO_pathbyaddr(void *addr, char *path, int sz);
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/*
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* Like DSO_pathbyaddr() but instead returns a handle to the DSO for the symbol
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* or NULL on error.
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*/
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DSO *DSO_dsobyaddr(void *addr, int flags);
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/*
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* This function should be used with caution! It looks up symbols in *all*
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* loaded modules and if module gets unloaded by somebody else attempt to
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* dereference the pointer is doomed to have fatal consequences. Primary
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* usage for this function is to probe *core* system functionality, e.g.
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* check if getnameinfo(3) is available at run-time without bothering about
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* OS-specific details such as libc.so.versioning or where does it actually
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* reside: in libc itself or libsocket.
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*/
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void *DSO_global_lookup(const char *name);
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int ERR_load_DSO_strings(void);
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#endif
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