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// SPDX-License-Identifier: LGPL-2.1-or-later
/*
* Copyright (C) 2012-2013 ProFUSION embedded systems
*/
/* 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
#undef _TIME_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)
{
/*
* Always consider the ABS_TOP_BUILDDIR as the base root of anything we do.
*
* Changing this to rootpath is tempting but incorrect, since it won't consider
* any third-party files managed through this LD_PRELOAD library, eg coverage.
*
* In other words: if using rootpath, the coverage gcna files will end up created
* in the wrong location eg. $rootpath/$ABS_TOP_BUILDDIR.
*/
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); \
}
#define WRAP_VERSTAT(prefix, suffix) \
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(int, -1, mkdir, mode_t);
WRAP_2ARGS(int, -1, stat, struct stat *);
WRAP_OPEN();
#ifdef HAVE_FOPEN64
WRAP_2ARGS(FILE *, NULL, fopen64, const char *);
#endif
#ifdef HAVE_STAT64
WRAP_2ARGS(int, -1, stat64, struct stat64 *);
#endif
#ifdef HAVE___STAT64_TIME64
extern int __stat64_time64(const char *file, void *buf);
WRAP_2ARGS(int, -1, __stat64_time64, void *);
#endif
#ifdef HAVE_OPEN64
WRAP_OPEN(64);
#endif
#if HAVE_DECL___XSTAT
WRAP_VERSTAT(__x, );
WRAP_VERSTAT(__x, 64);
#endif
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