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e701e381 LDM |
1 | /* |
2 | * Copyright (C) 2012 ProFUSION embedded systems | |
3 | * | |
4 | * This program is free software: you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License as published by | |
6 | * the Free Software Foundation, either version 2 of the License, or | |
7 | * (at your option) any later version. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License | |
15 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
16 | */ | |
17 | ||
6afc9cd6 LDM |
18 | #include <assert.h> |
19 | #include <errno.h> | |
4e36cb18 | 20 | #include <dirent.h> |
7fa8c2d2 | 21 | #include <fcntl.h> |
6afc9cd6 LDM |
22 | #include <dlfcn.h> |
23 | #include <limits.h> | |
24 | #include <stdlib.h> | |
7fa8c2d2 | 25 | #include <stdarg.h> |
6afc9cd6 LDM |
26 | #include <string.h> |
27 | #include <stdio.h> | |
7fa8c2d2 LDM |
28 | #include <sys/types.h> |
29 | #include <sys/stat.h> | |
1426a613 | 30 | #include <unistd.h> |
6afc9cd6 LDM |
31 | |
32 | #include "testsuite.h" | |
33 | ||
34 | static void *nextlib; | |
35 | static const char *rootpath; | |
36 | static size_t rootpathlen; | |
37 | ||
38 | static inline bool need_trap(const char *path) | |
39 | { | |
40 | return path != NULL && path[0] == '/'; | |
41 | } | |
42 | ||
43 | static const char *trap_path(const char *path, char buf[PATH_MAX * 2]) | |
44 | { | |
45 | size_t len; | |
46 | ||
47 | if (!need_trap(path)) | |
48 | return path; | |
49 | ||
50 | len = strlen(path); | |
51 | ||
52 | if (len + rootpathlen > PATH_MAX * 2) { | |
53 | errno = ENAMETOOLONG; | |
54 | return NULL; | |
55 | } | |
56 | ||
57 | memcpy(buf, rootpath, rootpathlen); | |
58 | strcpy(buf + rootpathlen, path); | |
59 | return buf; | |
60 | } | |
61 | ||
62 | static bool get_rootpath(const char *f) | |
63 | { | |
64 | if (rootpath != NULL) | |
65 | return true; | |
66 | ||
67 | rootpath = getenv(S_TC_ROOTFS); | |
68 | if (rootpath == NULL) { | |
69 | ERR("TRAP %s(): missing export %s?\n", f, S_TC_ROOTFS); | |
70 | errno = ENOENT; | |
71 | return false; | |
72 | } | |
73 | ||
74 | rootpathlen = strlen(rootpath); | |
75 | ||
76 | return true; | |
77 | } | |
78 | ||
79 | static void *get_libc_func(const char *f) | |
80 | { | |
81 | void *fp; | |
82 | ||
83 | if (nextlib == NULL) { | |
84 | #ifdef RTLD_NEXT | |
85 | nextlib = RTLD_NEXT; | |
86 | #else | |
87 | nextlib = dlopen("libc.so.6", RTLD_LAZY); | |
88 | #endif | |
89 | } | |
90 | ||
91 | fp = dlsym(nextlib, f); | |
92 | assert(fp); | |
93 | ||
94 | return fp; | |
95 | } | |
96 | ||
97 | TS_EXPORT FILE *fopen(const char *path, const char *mode) | |
98 | { | |
99 | const char *p; | |
100 | char buf[PATH_MAX * 2]; | |
f6301b65 | 101 | static FILE* (*_fopen)(const char *path, const char *mode); |
6afc9cd6 LDM |
102 | |
103 | if (!get_rootpath(__func__)) | |
104 | return NULL; | |
105 | ||
106 | _fopen = get_libc_func("fopen"); | |
107 | ||
108 | p = trap_path(path, buf); | |
109 | if (p == NULL) | |
110 | return NULL; | |
111 | ||
f6301b65 | 112 | return (*_fopen)(p, mode); |
6afc9cd6 | 113 | } |
7fa8c2d2 LDM |
114 | |
115 | TS_EXPORT int open(const char *path, int flags, ...) | |
116 | { | |
117 | const char *p; | |
118 | char buf[PATH_MAX * 2]; | |
119 | static int (*_open)(const char *path, int flags, ...); | |
120 | ||
121 | if (!get_rootpath(__func__)) | |
122 | return -1; | |
123 | ||
124 | _open = get_libc_func("open"); | |
125 | p = trap_path(path, buf); | |
126 | if (p == NULL) | |
127 | return -1; | |
128 | ||
129 | if (flags & O_CREAT) { | |
130 | mode_t mode; | |
131 | va_list ap; | |
132 | ||
133 | va_start(ap, flags); | |
134 | mode = va_arg(ap, mode_t); | |
135 | va_end(ap); | |
136 | _open(p, flags, mode); | |
137 | } | |
138 | ||
139 | return _open(p, flags); | |
140 | } | |
1426a613 LDM |
141 | |
142 | TS_EXPORT int stat(const char *path, struct stat *st) | |
143 | { | |
144 | const char *p; | |
145 | char buf[PATH_MAX * 2]; | |
146 | static int (*_stat)(const char *path, struct stat *buf); | |
147 | ||
148 | if (!get_rootpath(__func__)) | |
149 | return -1; | |
150 | ||
151 | _stat = get_libc_func("stat"); | |
152 | ||
153 | p = trap_path(path, buf); | |
154 | if (p == NULL) | |
155 | return -1; | |
156 | ||
157 | return _stat(p, st); | |
158 | } | |
159 | ||
d005aeb7 | 160 | #ifdef HAVE___XSTAT |
1426a613 LDM |
161 | TS_EXPORT int __xstat(int ver, const char *path, struct stat *st) |
162 | { | |
163 | const char *p; | |
164 | char buf[PATH_MAX * 2]; | |
165 | static int (*_xstat)(int __ver, const char *__filename, | |
166 | struct stat *__stat_buf); | |
167 | ||
168 | if (!get_rootpath(__func__)) | |
169 | return -1; | |
170 | ||
171 | _xstat = get_libc_func("__xstat"); | |
172 | ||
173 | p = trap_path(path, buf); | |
174 | if (p == NULL) | |
175 | return -1; | |
176 | ||
177 | return _xstat(ver, p, st); | |
178 | } | |
d005aeb7 | 179 | #endif |
1426a613 LDM |
180 | |
181 | TS_EXPORT int access(const char *path, int mode) | |
182 | { | |
183 | const char *p; | |
184 | char buf[PATH_MAX * 2]; | |
185 | static int (*_access)(const char *path, int mode); | |
186 | ||
187 | if (!get_rootpath(__func__)) | |
188 | return -1; | |
189 | ||
190 | _access = get_libc_func("access"); | |
191 | ||
192 | p = trap_path(path, buf); | |
193 | if (p == NULL) | |
194 | return -1; | |
195 | ||
196 | return _access(p, mode); | |
197 | } | |
4e36cb18 LDM |
198 | |
199 | TS_EXPORT DIR *opendir(const char *path) | |
200 | { | |
201 | const char *p; | |
202 | char buf[PATH_MAX * 2]; | |
f6301b65 | 203 | static DIR* (*_opendir)(const char *path); |
4e36cb18 LDM |
204 | |
205 | if (!get_rootpath(__func__)) | |
206 | return NULL; | |
207 | ||
208 | _opendir = get_libc_func("opendir"); | |
209 | ||
210 | p = trap_path(path, buf); | |
211 | if (p == NULL) | |
212 | return NULL; | |
213 | ||
f6301b65 | 214 | return (*_opendir)(p); |
4e36cb18 | 215 | } |