1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
|
/*
* Copyright (C) 2012-2013 ProFUSION embedded systems
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
/* We unset _FILE_OFFSET_BITS here so we can override both stat and stat64 on
* 32-bit architectures and forward each to the right libc function */
#undef _FILE_OFFSET_BITS
#include <assert.h>
#include <dirent.h>
#include <dlfcn.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <shared/util.h>
#include "testsuite.h"
static void *nextlib;
static const char *rootpath;
static size_t rootpathlen;
static inline bool need_trap(const char *path)
{
return path != NULL && path[0] == '/'
&& !strstartswith(path, ABS_TOP_BUILDDIR);
}
static const char *trap_path(const char *path, char buf[PATH_MAX * 2])
{
size_t len;
if (!need_trap(path))
return path;
len = strlen(path);
if (len + rootpathlen > PATH_MAX * 2) {
errno = ENAMETOOLONG;
return NULL;
}
memcpy(buf, rootpath, rootpathlen);
strcpy(buf + rootpathlen, path);
return buf;
}
static bool get_rootpath(const char *f)
{
if (rootpath != NULL)
return true;
rootpath = getenv(S_TC_ROOTFS);
if (rootpath == NULL) {
ERR("TRAP %s(): missing export %s?\n", f, S_TC_ROOTFS);
errno = ENOENT;
return false;
}
rootpathlen = strlen(rootpath);
return true;
}
static void *get_libc_func(const char *f)
{
void *fp;
if (nextlib == NULL) {
#ifdef RTLD_NEXT
nextlib = RTLD_NEXT;
#else
nextlib = dlopen("libc.so.6", RTLD_LAZY);
#endif
}
fp = dlsym(nextlib, f);
assert(fp);
return fp;
}
/* wrapper template for a function with one "const char* path" argument */
#define WRAP_1ARG(rettype, failret, name) \
TS_EXPORT rettype name(const char *path) \
{ \
const char *p; \
char buf[PATH_MAX * 2]; \
static rettype (*_fn)(const char*); \
\
if (!get_rootpath(__func__)) \
return failret; \
_fn = get_libc_func(#name); \
p = trap_path(path, buf); \
if (p == NULL) \
return failret; \
return (*_fn)(p); \
}
/* wrapper template for a function with "const char* path" and another argument */
#define WRAP_2ARGS(rettype, failret, name, arg2t) \
TS_EXPORT rettype name(const char *path, arg2t arg2) \
{ \
const char *p; \
char buf[PATH_MAX * 2]; \
static rettype (*_fn)(const char*, arg2t arg2); \
\
if (!get_rootpath(__func__)) \
return failret; \
_fn = get_libc_func(#name); \
p = trap_path(path, buf); \
if (p == NULL) \
return failret; \
return (*_fn)(p, arg2); \
}
/* wrapper template for open family */
#define WRAP_OPEN(suffix) \
TS_EXPORT int open ## suffix (const char *path, int flags, ...) \
{ \
const char *p; \
char buf[PATH_MAX * 2]; \
static int (*_fn)(const char *path, int flags, ...); \
\
if (!get_rootpath(__func__)) \
return -1; \
_fn = get_libc_func("open" #suffix); \
p = trap_path(path, buf); \
if (p == NULL) \
return -1; \
\
if (flags & O_CREAT) { \
mode_t mode; \
va_list ap; \
\
va_start(ap, flags); \
mode = va_arg(ap, mode_t); \
va_end(ap); \
return _fn(p, flags, mode); \
} \
\
return _fn(p, flags); \
}
/*
* wrapper template for __xstat family
* This family got deprecated/dropped in glibc 2.32.9000, but we still need
* to keep it for a while for programs that were built against previous versions
*/
#define WRAP_VERSTAT(prefix, suffix) \
TS_EXPORT int prefix ## stat ## suffix (int ver, \
const char *path, \
struct stat ## suffix *st); \
TS_EXPORT int prefix ## stat ## suffix (int ver, \
const char *path, \
struct stat ## suffix *st) \
{ \
const char *p; \
char buf[PATH_MAX * 2]; \
static int (*_fn)(int ver, const char *path, \
struct stat ## suffix *); \
_fn = get_libc_func(#prefix "stat" #suffix); \
\
if (!get_rootpath(__func__)) \
return -1; \
p = trap_path(path, buf); \
if (p == NULL) \
return -1; \
\
return _fn(ver, p, st); \
}
WRAP_1ARG(DIR*, NULL, opendir);
WRAP_1ARG(int, -1, chdir);
WRAP_2ARGS(FILE*, NULL, fopen, const char*);
WRAP_2ARGS(FILE*, NULL, fopen64, const char*);
WRAP_2ARGS(int, -1, mkdir, mode_t);
WRAP_2ARGS(int, -1, access, int);
WRAP_2ARGS(int, -1, stat, struct stat*);
WRAP_2ARGS(int, -1, lstat, struct stat*);
WRAP_2ARGS(int, -1, stat64, struct stat64*);
WRAP_2ARGS(int, -1, lstat64, struct stat64*);
WRAP_OPEN(64);
WRAP_OPEN();
#ifdef HAVE___XSTAT
WRAP_VERSTAT(__x,);
WRAP_VERSTAT(__lx,);
WRAP_VERSTAT(__x,64);
WRAP_VERSTAT(__lx,64);
#endif
|
