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/*
* wrappers.c
*
* Function wrapping functions.
*
* Copyright 1999-2006 Gentoo Foundation
*
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation version 2 of the License.
*
* 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
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 675 Mass Ave, Cambridge, MA 02139, USA.
*
* Partly Copyright (C) 1998-9 Pancrazio `Ezio' de Mauro <p@demauro.net>,
* as some of the InstallWatch code was used.
*
* $Header$
*/
#include "config.h"
/* Better way would be to only define _GNU_SOURCE when __GLIBC__ is defined,
* but including features.h and then defining _GNU_SOURCE do not work */
#if defined(HAVE_RTLD_NEXT)
# define _GNU_SOURCE
#endif
#include <errno.h>
#include <dlfcn.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <limits.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <dirent.h>
#include <unistd.h>
#include <fcntl.h>
#include "localdecls.h"
#include "sbutil.h"
#include "libsandbox.h"
#include "wrappers.h"
#if !defined(BROKEN_RTLD_NEXT) && defined(HAVE_RTLD_NEXT)
# define USE_RTLD_NEXT
#endif
/* Macro to check if a wrapper is defined, if not
* then try to resolve it again. */
#define check_dlsym(_name, _symname, _symver) \
{ \
int old_errno = errno; \
if (NULL == _name) \
_name = get_dlsym(_symname, _symver); \
errno = old_errno; \
}
static void *libc_handle = NULL;
extern char sandbox_lib[SB_PATH_MAX];
extern int sandbox_on;
/* Need to include the function wrappers here, as they are needed below */
#include "symbols.h"
void *get_dlsym(const char *symname, const char *symver)
{
void *symaddr = NULL;
if (NULL == libc_handle) {
#if !defined(USE_RTLD_NEXT)
libc_handle = dlopen(LIBC_VERSION, RTLD_LAZY);
if (!libc_handle) {
fprintf(stderr, "libsandbox: Can't dlopen libc: %s\n",
dlerror());
exit(EXIT_FAILURE);
}
#else
libc_handle = RTLD_NEXT;
#endif
}
if (NULL == symver)
symaddr = dlsym(libc_handle, symname);
else
symaddr = dlvsym(libc_handle, symname, symver);
if (!symaddr) {
fprintf(stderr, "libsandbox: Can't resolve %s: %s\n",
symname, dlerror());
exit(EXIT_FAILURE);
}
return symaddr;
}
int libsb_open(const char *pathname, int flags, ...)
{
va_list ap;
int mode = 0;
int result = -1;
if (flags & O_CREAT) {
va_start(ap, flags);
mode = va_arg(ap, int);
va_end(ap);
}
check_dlsym(true_open_DEFAULT, symname_open_DEFAULT,
symver_open_DEFAULT);
if (flags & O_CREAT)
result = true_open_DEFAULT(pathname, flags, mode);
else
result = true_open_DEFAULT(pathname, flags);
return result;
}
char *libsb_getcwd(char *buf, size_t size)
{
check_dlsym(true_getcwd_DEFAULT, symname_getcwd_DEFAULT,
symver_getcwd_DEFAULT);
return true_getcwd_DEFAULT(buf, size);
}
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