1 | /* Copyright © 2013, Intel Corporation |
2 | * |
3 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
4 | * of this software and associated documentation files (the "Software"), to deal |
5 | * in the Software without restriction, including without limitation the rights |
6 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
7 | * copies of the Software, and to permit persons to whom the Software is |
8 | * furnished to do so, subject to the following conditions: |
9 | * |
10 | * The above copyright notice and this permission notice shall be included in |
11 | * all copies or substantial portions of the Software. |
12 | * |
13 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
14 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
15 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
16 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
17 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
18 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
19 | * THE SOFTWARE. |
20 | */ |
21 | |
22 | #ifndef DLWRAP_H |
23 | #define DLWRAP_H |
24 | |
25 | #define _GNU_SOURCE |
26 | #include <dlfcn.h> |
27 | |
28 | /* Call the *real* dlopen. We have our own wrapper for dlopen that, of |
29 | * necessity must use claim the symbol 'dlopen'. So whenever anything |
30 | * internal needs to call the real, underlying dlopen function, the |
31 | * thing to call is dlwrap_real_dlopen. |
32 | */ |
33 | void * |
34 | dlwrap_real_dlopen(const char *filename, int flag); |
35 | |
36 | /* Perform a dlopen on the libfips library itself. |
37 | * |
38 | * Many places in fips need to lookup symbols within the libfips |
39 | * library itself, (and not in any other library). This function |
40 | * provides a reliable way to get a handle for performing such |
41 | * lookups. |
42 | * |
43 | * The returned handle can be passed to dlwrap_real_dlsym for the |
44 | * lookups. */ |
45 | void * |
46 | dlwrap_dlopen_libfips(void); |
47 | |
48 | /* Call the *real* dlsym. We have our own wrapper for dlsym that, of |
49 | * necessity must use claim the symbol 'dlsym'. So whenever anything |
50 | * internal needs to call the real, underlying dlysm function, the |
51 | * thing to call is dlwrap_real_dlsym. |
52 | */ |
53 | void * |
54 | dlwrap_real_dlsym(void *handle, const char *symbol); |
55 | |
56 | #define DEFER_TO_GL(library, func, name, args) \ |
57 | ({ \ |
58 | void *lib = dlwrap_real_dlopen(library, RTLD_LAZY | RTLD_LOCAL); \ |
59 | typeof(&func) real_func = dlwrap_real_dlsym(lib, name); \ |
60 | /* gcc extension -- func's return value is the return value of \ |
61 | * the statement. \ |
62 | */ \ |
63 | real_func args; \ |
64 | }) |
65 | |
66 | #endif |
67 | |
68 | |