| 1 | /*
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| 2 | * Copyright 2016 The OpenSSL Project Authors. All Rights Reserved.
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| 3 | *
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| 4 | * Licensed under the Apache License 2.0 (the "License"). You may not use
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| 5 | * this file except in compliance with the License. You can obtain a copy
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| 6 | * in the file LICENSE in the source distribution or at
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| 7 | * https://www.openssl.org/source/license.html
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| 8 | */
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| 9 |
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| 10 | #include <stdio.h>
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| 11 | #include "internal/cryptlib.h"
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| 12 | #include "internal/dso.h"
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| 13 | #include "crypto/dso_conf.h"
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| 14 | #include "internal/refcount.h"
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| 15 |
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| 16 | /**********************************************************************/
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| 17 | /* The low-level handle type used to refer to a loaded shared library */
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| 18 |
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| 19 | struct dso_st {
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| 20 | DSO_METHOD *meth;
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| 21 | /*
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| 22 | * Standard dlopen uses a (void *). Win32 uses a HANDLE. VMS doesn't use
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| 23 | * anything but will need to cache the filename for use in the dso_bind
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| 24 | * handler. All in all, let each method control its own destiny.
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| 25 | * "Handles" and such go in a STACK.
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| 26 | */
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| 27 | STACK_OF(void) *meth_data;
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| 28 | CRYPTO_REF_COUNT references;
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| 29 | int flags;
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| 30 | /*
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| 31 | * For use by applications etc ... use this for your bits'n'pieces, don't
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| 32 | * touch meth_data!
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| 33 | */
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| 34 | CRYPTO_EX_DATA ex_data;
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| 35 | /*
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| 36 | * If this callback function pointer is set to non-NULL, then it will be
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| 37 | * used in DSO_load() in place of meth->dso_name_converter. NB: This
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| 38 | * should normally set using DSO_set_name_converter().
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| 39 | */
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| 40 | DSO_NAME_CONVERTER_FUNC name_converter;
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| 41 | /*
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| 42 | * If this callback function pointer is set to non-NULL, then it will be
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| 43 | * used in DSO_load() in place of meth->dso_merger. NB: This should
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| 44 | * normally set using DSO_set_merger().
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| 45 | */
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| 46 | DSO_MERGER_FUNC merger;
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| 47 | /*
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| 48 | * This is populated with (a copy of) the platform-independent filename
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| 49 | * used for this DSO.
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| 50 | */
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| 51 | char *filename;
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| 52 | /*
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| 53 | * This is populated with (a copy of) the translated filename by which
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| 54 | * the DSO was actually loaded. It is NULL iff the DSO is not currently
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| 55 | * loaded. NB: This is here because the filename translation process may
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| 56 | * involve a callback being invoked more than once not only to convert to
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| 57 | * a platform-specific form, but also to try different filenames in the
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| 58 | * process of trying to perform a load. As such, this variable can be
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| 59 | * used to indicate (a) whether this DSO structure corresponds to a
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| 60 | * loaded library or not, and (b) the filename with which it was actually
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| 61 | * loaded.
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| 62 | */
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| 63 | char *loaded_filename;
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| 64 | CRYPTO_RWLOCK *lock;
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| 65 | };
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| 66 |
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| 67 | struct dso_meth_st {
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| 68 | const char *name;
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| 69 | /*
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| 70 | * Loads a shared library, NB: new DSO_METHODs must ensure that a
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| 71 | * successful load populates the loaded_filename field, and likewise a
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| 72 | * successful unload OPENSSL_frees and NULLs it out.
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| 73 | */
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| 74 | int (*dso_load) (DSO *dso);
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| 75 | /* Unloads a shared library */
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| 76 | int (*dso_unload) (DSO *dso);
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| 77 | /*
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| 78 | * Binds a function - assumes a return type of DSO_FUNC_TYPE. This should
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| 79 | * be cast to the real function prototype by the caller. Platforms that
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| 80 | * don't have compatible representations for different prototypes (this
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| 81 | * is possible within ANSI C) are highly unlikely to have shared
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| 82 | * libraries at all, let alone a DSO_METHOD implemented for them.
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| 83 | */
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| 84 | DSO_FUNC_TYPE (*dso_bind_func) (DSO *dso, const char *symname);
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| 85 | /*
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| 86 | * The generic (yuck) "ctrl()" function. NB: Negative return values
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| 87 | * (rather than zero) indicate errors.
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| 88 | */
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| 89 | long (*dso_ctrl) (DSO *dso, int cmd, long larg, void *parg);
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| 90 | /*
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| 91 | * The default DSO_METHOD-specific function for converting filenames to a
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| 92 | * canonical native form.
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| 93 | */
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| 94 | DSO_NAME_CONVERTER_FUNC dso_name_converter;
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| 95 | /*
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| 96 | * The default DSO_METHOD-specific function for converting filenames to a
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| 97 | * canonical native form.
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| 98 | */
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| 99 | DSO_MERGER_FUNC dso_merger;
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| 100 | /* [De]Initialisation handlers. */
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| 101 | int (*init) (DSO *dso);
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| 102 | int (*finish) (DSO *dso);
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| 103 | /* Return pathname of the module containing location */
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| 104 | int (*pathbyaddr) (void *addr, char *path, int sz);
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| 105 | /* Perform global symbol lookup, i.e. among *all* modules */
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| 106 | void *(*globallookup) (const char *symname);
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| 107 | };
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