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73decf59 RS |
1 | /* |
2 | * Copyright 2016 The OpenSSL Project Authors. All Rights Reserved. | |
e0a65194 | 3 | * |
b6a34e9a | 4 | * Licensed under the Apache License 2.0 (the "License"). You may not use |
d2e9e320 RS |
5 | * this file except in compliance with the License. You can obtain a copy |
6 | * in the file LICENSE in the source distribution or at | |
7 | * https://www.openssl.org/source/license.html | |
73decf59 | 8 | */ |
d2e9e320 | 9 | |
73decf59 RS |
10 | #include <stdio.h> |
11 | #include "internal/cryptlib.h" | |
921de151 | 12 | #include "internal/dso.h" |
25f2138b | 13 | #include "crypto/dso_conf.h" |
2f545ae4 | 14 | #include "internal/refcount.h" |
73decf59 RS |
15 | |
16 | /**********************************************************************/ | |
17 | /* The low-level handle type used to refer to a loaded shared library */ | |
18 | ||
19 | struct dso_st { | |
20 | DSO_METHOD *meth; | |
21 | /* | |
22 | * Standard dlopen uses a (void *). Win32 uses a HANDLE. VMS doesn't use | |
23 | * anything but will need to cache the filename for use in the dso_bind | |
24 | * handler. All in all, let each method control its own destiny. | |
25 | * "Handles" and such go in a STACK. | |
26 | */ | |
27 | STACK_OF(void) *meth_data; | |
2f545ae4 | 28 | CRYPTO_REF_COUNT references; |
73decf59 RS |
29 | int flags; |
30 | /* | |
31 | * For use by applications etc ... use this for your bits'n'pieces, don't | |
32 | * touch meth_data! | |
33 | */ | |
34 | CRYPTO_EX_DATA ex_data; | |
35 | /* | |
36 | * If this callback function pointer is set to non-NULL, then it will be | |
37 | * used in DSO_load() in place of meth->dso_name_converter. NB: This | |
38 | * should normally set using DSO_set_name_converter(). | |
39 | */ | |
40 | DSO_NAME_CONVERTER_FUNC name_converter; | |
41 | /* | |
42 | * If this callback function pointer is set to non-NULL, then it will be | |
43 | * used in DSO_load() in place of meth->dso_merger. NB: This should | |
44 | * normally set using DSO_set_merger(). | |
45 | */ | |
46 | DSO_MERGER_FUNC merger; | |
47 | /* | |
48 | * This is populated with (a copy of) the platform-independent filename | |
49 | * used for this DSO. | |
50 | */ | |
51 | char *filename; | |
52 | /* | |
53 | * This is populated with (a copy of) the translated filename by which | |
54 | * the DSO was actually loaded. It is NULL iff the DSO is not currently | |
55 | * loaded. NB: This is here because the filename translation process may | |
56 | * involve a callback being invoked more than once not only to convert to | |
57 | * a platform-specific form, but also to try different filenames in the | |
58 | * process of trying to perform a load. As such, this variable can be | |
59 | * used to indicate (a) whether this DSO structure corresponds to a | |
60 | * loaded library or not, and (b) the filename with which it was actually | |
61 | * loaded. | |
62 | */ | |
63 | char *loaded_filename; | |
64 | CRYPTO_RWLOCK *lock; | |
65 | }; | |
66 | ||
67 | struct dso_meth_st { | |
68 | const char *name; | |
69 | /* | |
70 | * Loads a shared library, NB: new DSO_METHODs must ensure that a | |
71 | * successful load populates the loaded_filename field, and likewise a | |
72 | * successful unload OPENSSL_frees and NULLs it out. | |
73 | */ | |
74 | int (*dso_load) (DSO *dso); | |
75 | /* Unloads a shared library */ | |
76 | int (*dso_unload) (DSO *dso); | |
73decf59 RS |
77 | /* |
78 | * Binds a function - assumes a return type of DSO_FUNC_TYPE. This should | |
79 | * be cast to the real function prototype by the caller. Platforms that | |
80 | * don't have compatible representations for different prototypes (this | |
81 | * is possible within ANSI C) are highly unlikely to have shared | |
82 | * libraries at all, let alone a DSO_METHOD implemented for them. | |
83 | */ | |
84 | DSO_FUNC_TYPE (*dso_bind_func) (DSO *dso, const char *symname); | |
85 | /* | |
86 | * The generic (yuck) "ctrl()" function. NB: Negative return values | |
87 | * (rather than zero) indicate errors. | |
88 | */ | |
89 | long (*dso_ctrl) (DSO *dso, int cmd, long larg, void *parg); | |
90 | /* | |
91 | * The default DSO_METHOD-specific function for converting filenames to a | |
92 | * canonical native form. | |
93 | */ | |
94 | DSO_NAME_CONVERTER_FUNC dso_name_converter; | |
95 | /* | |
96 | * The default DSO_METHOD-specific function for converting filenames to a | |
97 | * canonical native form. | |
98 | */ | |
99 | DSO_MERGER_FUNC dso_merger; | |
100 | /* [De]Initialisation handlers. */ | |
101 | int (*init) (DSO *dso); | |
102 | int (*finish) (DSO *dso); | |
cb6ea61c MC |
103 | /* Return pathname of the module containing location */ |
104 | int (*pathbyaddr) (void *addr, char *path, int sz); | |
73decf59 RS |
105 | /* Perform global symbol lookup, i.e. among *all* modules */ |
106 | void *(*globallookup) (const char *symname); | |
107 | }; |