/*
   Copyright (c) 2007-2012 Red Hat, Inc. <http://www.redhat.com>
   This file is part of GlusterFS.

   This file is licensed to you under your choice of the GNU Lesser
   General Public License, version 3 or any later version (LGPLv3 or
   later), or the GNU General Public License, version 2 (GPLv2), in all
   cases as published by the Free Software Foundation.
*/

/* LD PRELOAD'able library
 * A very simple library that intercepts booster supported system calls
 * and prints a log message to stdout.
 *
 * Combined with the ld-preload-test, we cam determine whether all system calls
 * are getting redirected into this library when LD_PRELOAD'ed. This helps us
 * conduct a basic test to ensure that the required syscalls actually will
 * be intercepted by the booster library.
 */

#include <dlfcn.h>
#include <sys/types.h>
#include <sys/uio.h>
#include <stdio.h>
#include <stdarg.h>
#include <stdlib.h>
#include <inttypes.h>
#include <string.h>
#include <assert.h>
#include <errno.h>
#include <utime.h>
#include <sys/statfs.h>
#include <sys/statvfs.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <dirent.h>
#include <sys/xattr.h>
#include <sys/sendfile.h>

/* Err number that is assigned to errno so that test application can
 * verify that the function was intercepted correctly.
 */
#define PRELOAD_ERRNO_VERF 6449
#define set_errno() (errno = PRELOAD_ERRNO_VERF)

void
intercept(char *call, int tabs)
{
    while (tabs > 0) {
        fprintf(stdout, "\t");
        --tabs;
    }

    fprintf(stdout, "Intercepted by %s", call);
}

int
creat64(const char *pathname, mode_t mode)
{
    intercept("creat64", 2);
    set_errno();
    return -1;
}

int
creat(const char *pathname, mode_t mode)
{
    intercept("creat", 2);
    set_errno();
    return -1;
}

int
close(int fd)
{
    intercept("close", 2);
    set_errno();
    return -1;
}

int
open64(const char *pathname, int flags, ...)
{
    intercept("open64", 2);
    set_errno();
    return -1;
}

int
open(const char *pathname, int flags, ...)
{
    intercept("open", 2);
    set_errno();
    return -1;
}

ssize_t
read(int fd, void *buf, size_t count)
{
    intercept("read", 2);
    set_errno();
    return -1;
}

ssize_t
readv(int fd, const struct iovec *vector, int count)
{
    intercept("readv", 2);
    set_errno();
    return -1;
}

ssize_t
pread(int fd, void *buf, size_t count, unsigned long offset)
{
    intercept("pread", 2);
    set_errno();
    return -1;
}

ssize_t
pread64(int fd, void *buf, size_t count, uint64_t offset)
{
    intercept("pread64", 2);
    set_errno();
    return -1;
}

ssize_t
write(int fd, const void *buf, size_t count)
{
    intercept("write", 2);
    set_errno();
    return -1;
}

ssize_t
writev(int fd, const struct iovec *vector, int count)
{
    intercept("writev", 2);
    set_errno();
    return -1;
}

ssize_t
pwrite(int fd, const void *buf, size_t count, unsigned long offset)
{
    intercept("pwrite", 2);
    set_errno();
    return -1;
}

ssize_t
pwrite64(int fd, const void *buf, size_t count, uint64_t offset)
{
    intercept("pwrite64", 2);
    set_errno();
    return -1;
}

off_t
lseek(int fildes, unsigned long offset, int whence)
{
    intercept("lseek", 2);
    set_errno();
    return -1;
}

off_t
lseek64(int fildes, uint64_t offset, int whence)
{
    intercept("lseek64", 2);
    set_errno();
    return -1;
}

int
dup(int fd)
{
    intercept("dup", 2);
    set_errno();
    return -1;
}

int
dup2(int oldfd, int newfd)
{
    intercept("dup2", 2);
    set_errno();
    return -1;
}

int
mkdir(const char *pathname, mode_t mode)
{
    intercept("mkdir", 2);
    set_errno();
    return -1;
}

int
rmdir(const char *pathname)
{
    intercept("rmdir", 2);
    set_errno();
    return -1;
}

int
chmod(const char *pathname, mode_t mode)
{
    intercept("chmod", 2);
    set_errno();
    return -1;
}

int
chown(const char *pathname, uid_t owner, gid_t group)
{
    intercept("chown", 2);
    set_errno();
    return -1;
}

int
fchmod(int fd, mode_t mode)
{
    intercept("fchmod", 2);
    set_errno();
    return -1;
}

int
fchown(int fd, uid_t uid, gid_t gid)
{
    intercept("fchown", 2);
    set_errno();
    return -1;
}

int
fsync(int fd)
{
    intercept("fsync", 2);
    set_errno();
    return -1;
}

int
ftruncate(int fd, off_t length)
{
    intercept("ftruncate", 1);
    set_errno();
    return -1;
}

int
ftruncate64(int fd, off_t length)
{
    intercept("ftruncate64", 1);
    set_errno();
    return -1;
}

int
link(const char *oldpath, const char *newname)
{
    intercept("link", 2);
    set_errno();
    return -1;
}

int
rename(const char *oldpath, const char *newpath)
{
    intercept("rename", 2);
    set_errno();
    return -1;
}

int
utimes(const char *path, const struct timeval times[2])
{
    intercept("utimes", 2);
    set_errno();
    return -1;
}

int
futimes(int fd, const struct timeval times[2])
{
    intercept("futimes", 2);
    set_errno();
    return -1;
}

int
utime(const char *path, const struct utimbuf *buf)
{
    intercept("utime", 2);
    set_errno();
    return -1;
}

int
mknod(const char *path, mode_t mode, dev_t dev)
{
    intercept("mknod", 2);
    set_errno();
    return -1;
}

int
__xmknod(int ver, const char *path, mode_t mode, dev_t *dev)
{
    intercept("__xmknod", 2);
    set_errno();
    return -1;
}

int
mkfifo(const char *path, mode_t mode)
{
    intercept("mkfifo", 2);
    set_errno();
    return -1;
}

int
unlink(const char *path)
{
    intercept("unlink", 2);
    set_errno();
    return -1;
}

int
symlink(const char *oldpath, const char *newpath)
{
    intercept("symlink", 2);
    set_errno();
    return -1;
}

int
readlink(const char *path, char *buf, size_t bufsize)
{
    intercept("readlink", 1);
    set_errno();
    return -1;
}

char *
realpath(const char *path, char *resolved)
{
    intercept("realpath", 1);
    set_errno();
    return NULL;
}

DIR *
opendir(const char *path)
{
    intercept("opendir", 2);
    set_errno();
    return NULL;
}

struct dirent *
readdir(DIR *dir)
{
    intercept("readdir\t", 2);
    set_errno();
    return NULL;
}

struct dirent *
readdir64(DIR *dir)
{
    intercept("readdir64", 2);
    set_errno();
    return NULL;
}

int
readdir_r(DIR *dir, struct dirent *entry, struct dirent **result)
{
    intercept("readdir_r", 1);
    set_errno();
    return -1;
}

int
readdir64_r(DIR *dir, struct dirent *entry, struct dirent **result)
{
    intercept("readdir64_r", 1);
    set_errno();
    return -1;
}

int
closedir(DIR *dh)
{
    intercept("closedir", 1);
    set_errno();
    return -1;
}

int
__xstat(int ver, const char *path, struct stat *buf)
{
    intercept("__xstat\t", 2);
    set_errno();
    return -1;
}

int
__xstat64(int ver, const char *path, struct stat *buf)
{
    intercept("__xstat64", 2);
    set_errno();
    return -1;
}

int
stat(const char *path, struct stat *buf)
{
    intercept("stat", 2);
    set_errno();
    return -1;
}

int
stat64(const char *path, struct stat *buf)
{
    intercept("stat64", 2);
    set_errno();
    return -1;
}

int
__fxstat(int ver, int fd, struct stat *buf)
{
    intercept("__fxstat\t", 2);
    set_errno();
    return -1;
}

int
__fxstat64(int ver, int fd, struct stat *buf)
{
    intercept("__fxstat64", 2);
    set_errno();
    return -1;
}

int
fstat(int fd, struct stat *buf)
{
    intercept("fstat", 2);
    set_errno();
    return -1;
}

int
fstat64(int fd, struct stat *buf)
{
    intercept("fstat64", 2);
    set_errno();
    return -1;
}

int
__lxstat(int ver, const char *path, struct stat *buf)
{
    intercept("__lxstat\t", 2);
    set_errno();
    return -1;
}

int
__lxstat64(int ver, const char *path, struct stat *buf)
{
    intercept("__lxstat64", 2);
    set_errno();
    return -1;
}

int
lstat(const char *path, struct stat *buf)
{
    intercept("lstat", 2);
    set_errno();
    return -1;
}

int
lstat64(const char *path, struct stat *buf)
{
    intercept("lstat64", 2);
    set_errno();
    return -1;
}

int
statfs(const char *path, struct statfs *buf)
{
    intercept("statfs", 2);
    set_errno();
    return -1;
}

int
statfs64(const char *path, struct statfs *buf)
{
    intercept("statfs64", 2);
    set_errno();
    return -1;
}

int
statvfs(const char *path, struct statvfs *buf)
{
    intercept("statvfs\t", 2);
    set_errno();
    return -1;
}

int
statvfs64(const char *path, struct statvfs *buf)
{
    intercept("statvfs64", 2);
    set_errno();
    return -1;
}

ssize_t
getxattr(const char *path, const char *name, void *value, size_t size)
{
    intercept("getxattr", 1);
    set_errno();
    return -1;
}

ssize_t
lgetxattr(const char *path, const char *name, void *value, size_t size)
{
    intercept("lgetxattr", 1);
    set_errno();
    return -1;
}

int
remove(const char *path)
{
    intercept("remove", 2);
    set_errno();
    return -1;
}

int
lchown(const char *path, uid_t owner, gid_t group)
{
    intercept("lchown", 2);
    set_errno();
    return -1;
}

void
rewinddir(DIR *dirp)
{
    intercept("rewinddir", 1);
    set_errno();
    return;
}

void
seekdir(DIR *dirp, off_t offset)
{
    intercept("seekdir", 2);
    set_errno();
    return;
}

off_t
telldir(DIR *dirp)
{
    intercept("telldir", 2);
    set_errno();
    return -1;
}

ssize_t
sendfile(int out_fd, int in_fd, off_t *offset, size_t count)
{
    intercept("sendfile\t", 1);
    set_errno();
    return -1;
}

ssize_t
sendfile64(int out_fd, int in_fd, off_t *offset, size_t count)
{
    intercept("sendfile64", 1);
    set_errno();
    return -1;
}

int
fcntl(int fd, int cmd, ...)
{
    intercept("fcntl", 2);
    set_errno();
    return -1;
}