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/*
* Copyright (c) 2016 Red Hat, Inc.
*
* All rights reserved.
*
* Author: Jan Pokorny <jpokorny@redhat.com>
*
* This file is part of libqb.
*
* libqb 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.
*
* libqb 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 libqb. If not, see <http://www.gnu.org/licenses/>.
*/
#include "_failure_injection.h"
#include "config.h"
#ifndef _GNU_SOURCE
#define _GNU_SOURCE
#endif
#include <dlfcn.h> /* dlsym */
#include <errno.h>
#include <fcntl.h> /* O_CREAT, ... */
#include <stdarg.h>
#include <stdio.h> /* perror */
#include <sys/types.h> /* mode_t, off_t */
/*** unlink (failure injection) ***/
int _fi_unlink_inject_failure = 0;
typedef int (func_unlink)(const char *);
func_unlink unlink;
static int
fake_unlink(const char *pathname)
{
errno = EACCES;
return -1;
}
int
unlink(const char *pathname)
{
static func_unlink *real_unlink;
if (_fi_unlink_inject_failure) {
return fake_unlink(pathname);
} else if (!real_unlink) {
real_unlink = (func_unlink *)
dlsym(RTLD_NEXT, "unlink");
if (!real_unlink) {
perror("dlsym(RTLD_NEXT, \"unlink\"");
real_unlink = fake_unlink;
}
}
return real_unlink(pathname);
}
/*** unlinkat (failure injection) ***/
#if defined(HAVE_UNLINKAT)
typedef int (func_unlinkat)(int, const char *, int);
func_unlinkat unlinkat;
static int
fake_unlinkat(int dirfd, const char *pathname, int flags)
{
errno = EACCES;
return -1;
}
int
unlinkat(int dirfd, const char *pathname, int flags)
{
static func_unlinkat *real_unlinkat;
if (_fi_unlink_inject_failure) {
return fake_unlinkat(dirfd, pathname, flags);
} else if (!real_unlinkat) {
real_unlinkat = (func_unlinkat *)
dlsym(RTLD_NEXT, "unlinkat");
if (!real_unlinkat) {
perror("dlsym(RTLD_NEXT, \"unlinkat\"");
real_unlinkat = fake_unlinkat;
}
}
return real_unlinkat(dirfd, pathname, flags);
}
#endif
/*** truncate (trigger detection) ***/
int _fi_truncate_called = 0;
typedef int (func_truncate)(const char *, off_t);
func_truncate truncate;
static int
fake_truncate(const char *path, off_t length)
{
errno = EIO;
return -1;
}
int
truncate(const char *path, off_t length)
{
static func_truncate *real_truncate;
if (!real_truncate) {
real_truncate = (func_truncate *)
dlsym(RTLD_NEXT, "truncate");
if (!real_truncate) {
perror("dlsym(RTLD_NEXT, \"truncate\"");
real_truncate = fake_truncate;
}
}
_fi_truncate_called++;
return real_truncate(path, length);
}
/*** openat (trigger detection) ***/
int _fi_openat_called = 0;
#if defined(HAVE_UNLINKAT)
typedef int (func_openat)(int, const char *, int, ...);
func_openat openat;
static int
fake_openat(int fd, const char *path, int oflag, ...)
{
errno = EBADF;
return -1;
}
#ifndef O_TMPFILE
# define O_TMPFILE 0
#endif
int
openat(int fd, const char *path, int oflag, ...)
{
static func_openat *real_openat;
int use_mode = 0;
mode_t mode;
va_list ap;
if (!real_openat) {
real_openat = (func_openat *)
dlsym(RTLD_NEXT, "openat");
if (!real_openat) {
perror("dlsym(RTLD_NEXT, \"openat\"");
real_openat = fake_openat;
}
}
_fi_openat_called++;
va_start(ap, oflag);
if (oflag & (O_CREAT | O_TMPFILE)) {
mode = va_arg(ap, mode_t);
use_mode = 1;
}
va_end(ap);
if (use_mode) {
return real_openat(fd, path, oflag, mode);
} else {
return real_openat(fd, path, oflag);
}
}
#endif
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