| 1 |
/*
|
| 2 |
* wrappers.c
|
| 3 |
*
|
| 4 |
* Function wrapping functions.
|
| 5 |
*
|
| 6 |
* Copyright 1999-2008 Gentoo Foundation
|
| 7 |
* Licensed under the GPL-2
|
| 8 |
*
|
| 9 |
* Partly Copyright (C) 1998-9 Pancrazio `Ezio' de Mauro <p@demauro.net>,
|
| 10 |
* as some of the InstallWatch code was used.
|
| 11 |
*/
|
| 12 |
|
| 13 |
#include "headers.h"
|
| 14 |
#include "sbutil.h"
|
| 15 |
#include "libsandbox.h"
|
| 16 |
#include "wrappers.h"
|
| 17 |
|
| 18 |
#if !defined(BROKEN_RTLD_NEXT) && defined(HAVE_RTLD_NEXT)
|
| 19 |
# define USE_RTLD_NEXT
|
| 20 |
#endif
|
| 21 |
|
| 22 |
/* Macro to check if a wrapper is defined, if not
|
| 23 |
* then try to resolve it again. */
|
| 24 |
#define check_dlsym(_name, _symname, _symver) \
|
| 25 |
{ \
|
| 26 |
int old_errno = errno; \
|
| 27 |
if (NULL == _name) \
|
| 28 |
_name = get_dlsym(_symname, _symver); \
|
| 29 |
errno = old_errno; \
|
| 30 |
}
|
| 31 |
|
| 32 |
static void *libc_handle = NULL;
|
| 33 |
|
| 34 |
extern char sandbox_lib[SB_PATH_MAX];
|
| 35 |
extern int sandbox_on;
|
| 36 |
|
| 37 |
/* Need to include the function wrappers here, as they are needed below */
|
| 38 |
#include "symbols.h"
|
| 39 |
|
| 40 |
|
| 41 |
void *get_dlsym(const char *symname, const char *symver)
|
| 42 |
{
|
| 43 |
void *symaddr = NULL;
|
| 44 |
|
| 45 |
if (NULL == libc_handle) {
|
| 46 |
#if !defined(USE_RTLD_NEXT)
|
| 47 |
libc_handle = dlopen(LIBC_VERSION, RTLD_LAZY);
|
| 48 |
if (!libc_handle) {
|
| 49 |
fprintf(stderr, "libsandbox: Can't dlopen libc: %s\n",
|
| 50 |
dlerror());
|
| 51 |
exit(EXIT_FAILURE);
|
| 52 |
}
|
| 53 |
#else
|
| 54 |
libc_handle = RTLD_NEXT;
|
| 55 |
#endif
|
| 56 |
}
|
| 57 |
|
| 58 |
if (NULL == symver)
|
| 59 |
symaddr = dlsym(libc_handle, symname);
|
| 60 |
else
|
| 61 |
symaddr = dlvsym(libc_handle, symname, symver);
|
| 62 |
if (!symaddr) {
|
| 63 |
fprintf(stderr, "libsandbox: Can't resolve %s: %s\n",
|
| 64 |
symname, dlerror());
|
| 65 |
exit(EXIT_FAILURE);
|
| 66 |
}
|
| 67 |
|
| 68 |
return symaddr;
|
| 69 |
}
|
| 70 |
|
| 71 |
int libsb_open(const char *pathname, int flags, ...)
|
| 72 |
{
|
| 73 |
va_list ap;
|
| 74 |
int mode = 0;
|
| 75 |
int result = -1;
|
| 76 |
|
| 77 |
if (flags & O_CREAT) {
|
| 78 |
va_start(ap, flags);
|
| 79 |
mode = va_arg(ap, int);
|
| 80 |
va_end(ap);
|
| 81 |
}
|
| 82 |
|
| 83 |
check_dlsym(true_open_DEFAULT, symname_open_DEFAULT,
|
| 84 |
symver_open_DEFAULT);
|
| 85 |
if (flags & O_CREAT)
|
| 86 |
result = true_open_DEFAULT(pathname, flags, mode);
|
| 87 |
else
|
| 88 |
result = true_open_DEFAULT(pathname, flags);
|
| 89 |
|
| 90 |
return result;
|
| 91 |
}
|
| 92 |
|
| 93 |
char *libsb_getcwd(char *buf, size_t size)
|
| 94 |
{
|
| 95 |
check_dlsym(true_getcwd_DEFAULT, symname_getcwd_DEFAULT,
|
| 96 |
symver_getcwd_DEFAULT);
|
| 97 |
|
| 98 |
return true_getcwd_DEFAULT(buf, size);
|
| 99 |
}
|
Parent Directory
| 
Revision Log