1 /* Test error reporting for dlsym, dlvsym failures.
2 Copyright (C) 2016-2022 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
18
19 #include <dlfcn.h>
20 #include <gnu/lib-names.h>
21 #include <stdio.h>
22 #include <stdlib.h>
23 #include <string.h>
24
25 /* Used to disambiguate symbol names. */
26 static int counter;
27
28 static void
test_one(void * handle,const char * name,void * (func)(void *,const char *),const char * suffix)29 test_one (void *handle, const char *name, void *(func) (void *, const char *),
30 const char *suffix)
31 {
32 ++counter;
33 char symbol[32];
34 snprintf (symbol, sizeof (symbol), "no_such_symbol_%d", counter);
35 char *expected_message;
36 if (asprintf (&expected_message, ": undefined symbol: %s%s",
37 symbol, suffix) < 0)
38 {
39 printf ("error: asprintf: %m\n");
40 abort ();
41 }
42
43 void *addr = func (handle, symbol);
44 if (addr != NULL)
45 {
46 printf ("error: %s: found symbol \"no_such_symbol\"\n", name);
47 abort ();
48 }
49 const char *message = dlerror ();
50 if (message == NULL)
51 {
52 printf ("error: %s: missing error message\n", name);
53 abort ();
54 }
55 const char *message_without_path = strchrnul (message, ':');
56 if (strcmp (message_without_path, expected_message) != 0)
57 {
58 printf ("error: %s: unexpected error message: %s\n", name, message);
59 abort ();
60 }
61 free (expected_message);
62
63 message = dlerror ();
64 if (message != NULL)
65 {
66 printf ("error: %s: unexpected error message: %s\n", name, message);
67 abort ();
68 }
69 }
70
71 static void
test_handles(const char * name,void * (func)(void *,const char *),const char * suffix)72 test_handles (const char *name, void *(func) (void *, const char *),
73 const char *suffix)
74 {
75 test_one (RTLD_DEFAULT, name, func, suffix);
76 test_one (RTLD_NEXT, name, func, suffix);
77
78 void *handle = dlopen (LIBC_SO, RTLD_LAZY);
79 if (handle == NULL)
80 {
81 printf ("error: cannot dlopen %s: %s\n", LIBC_SO, dlerror ());
82 abort ();
83 }
84 test_one (handle, name, func, suffix);
85 dlclose (handle);
86 }
87
88 static void *
dlvsym_no_such_version(void * handle,const char * name)89 dlvsym_no_such_version (void *handle, const char *name)
90 {
91 return dlvsym (handle, name, "NO_SUCH_VERSION");
92 }
93
94 static void *
dlvsym_glibc_private(void * handle,const char * name)95 dlvsym_glibc_private (void *handle, const char *name)
96 {
97 return dlvsym (handle, name, "GLIBC_PRIVATE");
98 }
99
100 static int
do_test(void)101 do_test (void)
102 {
103 test_handles ("dlsym", dlsym, "");
104 test_handles ("dlvsym", dlvsym_no_such_version,
105 ", version NO_SUCH_VERSION");
106 test_handles ("dlvsym", dlvsym_glibc_private,
107 ", version GLIBC_PRIVATE");
108
109 return 0;
110 }
111
112
113 #include <support/test-driver.c>
114