/
libfakeroot.c
1508 lines (1229 loc) · 30.9 KB
/
libfakeroot.c
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/*
Copyright: GPL.
Author: joost witteveen (joostje@debian.org)
*/
/* #define _POSIX_C_SOURCE 199309L whatever that may mean...*/
/* #define _BSD_SOURCE I use strdup, S_IFDIR, etc */
/* Roderich Schupp writes (bug #79100):
/usr/include/dlfcn.h from libc6 2.2-5 defines RTLD_NEXT only
when compiled with _GNU_SOURCE defined. Hence libfakeroot.c doesn't pick
it
up and does a dlopen("/lib/libc.so.6",...) in get_libc().
This works most of the time, but explodes if you have an arch-optimized
libc installed: the program now has two versions of libc.so
(/lib/libc.so.6 and, say, /lib/i586/libc.so.6) mapped. Again for
some programs you might get away with this, but running bash under
fakeroot
always bombs. Simple fix:
*/
#define _GNU_SOURCE
#define FAKEROOT_LIBFAKEROOT
#include "config.h"
#include "communicate.h"
#ifdef STAT64_SUPPORT
#define INT_STRUCT_STAT struct stat64
#define INT_NEXT_STAT(a,b,c) NEXT_STAT64(a,b,c)
#define INT_NEXT_LSTAT(a,b,c) NEXT_LSTAT64(a,b,c)
#define INT_NEXT_FSTAT(a,b,c) NEXT_FSTAT64(a,b,c)
#ifndef STUPID_ALPHA_HACK
#define INT_SEND_STAT(a,b) send_stat64(a,b)
#else
#define INT_SEND_STAT(a,b,c) send_stat64(a,b,c)
#endif
#else
#define INT_STRUCT_STAT struct stat
#define INT_NEXT_STAT(a,b,c) NEXT_STAT(a,b,c)
#define INT_NEXT_LSTAT(a,b,c) NEXT_LSTAT(a,b,c)
#define INT_NEXT_FSTAT(a,b,c) NEXT_FSTAT(a,b,c)
#ifndef STUPID_ALPHA_HACK
#define INT_SEND_STAT(a,b) send_stat(a,b)
#else
#define INT_SEND_STAT(a,b,c) send_stat(a,b,c)
#endif
#endif
#include <stdlib.h>
#include <sys/ipc.h>
#include <sys/msg.h>
#include <fcntl.h>
#include <string.h>
#include <stdio.h>
#include <stdarg.h>
#include <dlfcn.h>
#include <unistd.h>
#include <dirent.h>
#include <errno.h>
#include <sys/types.h>
#ifdef HAVE_SYS_ACL_H
#include <sys/acl.h>
#endif /* HAVE_SYS_ACL_H */
#if HAVE_FTS_H
#include <fts.h>
#endif /* HAVE_FTS_H */
#if !HAVE_DECL_SETENV
extern int setenv (const char *name, const char *value, int replace);
#endif
#if !HAVE_DECL_UNSETENV
extern int unsetenv (const char *name);
#endif
/*
Where are those shared libraries?
If I knew of a configure/libtool way to find that out, I'd use it. Or
any other way other than the method I'm using below. Does anybody know
how I can get that location? (BTW, symply linking a programme, and running
`ldd' on it isn't the option, as Digital Unix doesn't have ldd)
*/
/*
Note that LIBCPATH isn't actually used on Linux or Solaris, as RTLD_NEXT
is defined and we use that to get the `next_*' functions
Linux:
*/
/* OSF1 :*/
/*#define LIBCPATH "/usr/shlib/libc.so"*/
#undef __xstat
#undef __fxstat
#undef __lxstat
#undef __xstat64
#undef __fxstat64
#undef __lxstat64
#undef _FILE_OFFSET_BITS
/*
// next_wrap_st:
// this structure is used in next_wrap, which is defined in
// wrapstruct.h, included below
*/
struct next_wrap_st{
void **doit;
char *name;
};
void *get_libc(){
#ifndef RTLD_NEXT
void *lib=0;
if(!lib){
lib= dlopen(LIBCPATH,RTLD_LAZY);
}
if (NULL==lib) {
fprintf(stderr, "Couldn't find libc at: %s\n", LIBCPATH);
abort();
}
return lib;
#else
return RTLD_NEXT;
#endif
}
void load_library_symbols(void);
int fakeroot_disabled = 0;
#include "wrapped.h"
#include "wraptmpf.h"
#include "wrapdef.h"
#include "wrapstruct.h"
void load_library_symbols(void){
/* this function loads all original functions from the C library.
I ran into problems when each function individually
loaded it's original counterpart, as RTLD_NEXT seems to have
a different meaning in files with different names than libtricks.c
(I.E, dlsym(RTLD_NEXT, ...) called in vsearch.c returned funtions
defined in libtricks */
/* The calling of this function itself is somewhat tricky:
the awk script wrapawk generates several .h files. In wraptmpf.h
there are temporary definitions for tmp_*, that do the call
to this function. The other generated .h files do even more tricky
things :) */
static int done=0;
int i;
const char *msg;
if(!done){
for(i=0; next_wrap[i].doit; i++){
*(next_wrap[i].doit)=dlsym(get_libc(), next_wrap[i].name);
if ( (msg = dlerror()) != NULL){
fprintf (stderr, "dlsym(%s): %s\n", next_wrap[i].name, msg);
/* abort ();*/
}
}
}
}
/*
* Fake implementations for the setuid family of functions.
* The fake IDs are inherited by child processes via environment variables.
*
* Issues:
* o Privileges are not checked, which results in incorrect behaviour.
* Example: process changes its (real, effective and saved) uid to 1000
* and then tries to regain root privileges. This should normally result
* in an EPERM, but our implementation doesn't care...
* o If one of the setenv calls fails, the state may get corrupted.
* o Not thread-safe.
*/
/* Generic set/get ID functions */
static int env_get_id(const char *key) {
char *str = getenv(key);
if (str)
return atoi(str);
return 0;
}
static int env_set_id(const char *key, int id) {
if (id == 0) {
unsetenv(key);
return 0;
} else {
char str[12];
snprintf(str, sizeof (str), "%d", id);
return setenv(key, str, 1);
}
}
static void read_id(unsigned int *id, const char *key) {
if (*id == (unsigned int)-1)
*id = env_get_id(key);
}
static int write_id(const char *key, int id) {
if (env_get_id(key) != id)
return env_set_id(key, id);
return 0;
}
/* Fake ID storage */
static uid_t faked_real_uid = -1;
static gid_t faked_real_gid = -1;
static uid_t faked_effective_uid = -1;
static gid_t faked_effective_gid = -1;
static uid_t faked_saved_uid = -1;
static gid_t faked_saved_gid = -1;
static uid_t faked_fs_uid = -1;
static gid_t faked_fs_gid = -1;
/* Read user ID */
static void read_real_uid() {
read_id(&faked_real_uid, FAKEROOTUID_ENV);
}
static void read_effective_uid() {
read_id(&faked_effective_uid, FAKEROOTEUID_ENV);
}
static void read_saved_uid() {
read_id(&faked_saved_uid, FAKEROOTSUID_ENV);
}
static void read_fs_uid() {
read_id(&faked_fs_uid, FAKEROOTFUID_ENV);
}
static void read_uids() {
read_real_uid();
read_effective_uid();
read_saved_uid();
read_fs_uid();
}
/* Read group ID */
static void read_real_gid() {
read_id(&faked_real_gid, FAKEROOTGID_ENV);
}
static void read_effective_gid() {
read_id(&faked_effective_gid, FAKEROOTEGID_ENV);
}
static void read_saved_gid() {
read_id(&faked_saved_gid, FAKEROOTSGID_ENV);
}
static void read_fs_gid() {
read_id(&faked_fs_gid, FAKEROOTFGID_ENV);
}
static void read_gids() {
read_real_gid();
read_effective_gid();
read_saved_gid();
read_fs_gid();
}
/* Write user ID */
static int write_real_uid() {
return write_id(FAKEROOTUID_ENV, faked_real_uid);
}
static int write_effective_uid() {
return write_id(FAKEROOTEUID_ENV, faked_effective_uid);
}
static int write_saved_uid() {
return write_id(FAKEROOTSUID_ENV, faked_saved_uid);
}
static int write_fs_uid() {
return write_id(FAKEROOTFUID_ENV, faked_fs_uid);
}
static int write_uids() {
if (write_real_uid() < 0)
return -1;
if (write_effective_uid() < 0)
return -1;
if (write_saved_uid() < 0)
return -1;
if (write_fs_uid() < 0)
return -1;
return 0;
}
/* Write group ID */
static int write_real_gid() {
return write_id(FAKEROOTGID_ENV, faked_real_gid);
}
static int write_effective_gid() {
return write_id(FAKEROOTEGID_ENV, faked_effective_gid);
}
static int write_saved_gid() {
return write_id(FAKEROOTSGID_ENV, faked_saved_gid);
}
static int write_fs_gid() {
return write_id(FAKEROOTFGID_ENV, faked_fs_gid);
}
static int write_gids() {
if (write_real_gid() < 0)
return -1;
if (write_effective_gid() < 0)
return -1;
if (write_saved_gid() < 0)
return -1;
if (write_fs_gid() < 0)
return -1;
return 0;
}
/* Faked get functions */
static uid_t get_faked_uid() {
read_real_uid();
return faked_real_uid;
}
static gid_t get_faked_gid() {
read_real_gid();
return faked_real_gid;
}
static uid_t get_faked_euid() {
read_effective_uid();
return faked_effective_uid;
}
static gid_t get_faked_egid() {
read_effective_gid();
return faked_effective_gid;
}
static uid_t get_faked_suid() {
read_saved_uid();
return faked_saved_uid;
}
static gid_t get_faked_sgid() {
read_saved_gid();
return faked_saved_gid;
}
static uid_t get_faked_fsuid() {
read_fs_uid();
return faked_fs_uid;
}
static gid_t get_faked_fsgid() {
read_fs_gid();
return faked_fs_gid;
}
/* Faked set functions */
static int set_faked_uid(uid_t uid) {
read_uids();
if (faked_effective_uid == 0) {
faked_real_uid = uid;
faked_effective_uid = uid;
faked_saved_uid = uid;
} else {
faked_effective_uid = uid;
}
faked_fs_uid = uid;
return write_uids();
}
static int set_faked_gid(gid_t gid) {
read_gids();
if (faked_effective_gid == 0) {
faked_real_gid = gid;
faked_effective_gid = gid;
faked_saved_gid = gid;
} else {
faked_effective_gid = gid;
}
faked_fs_gid = gid;
return write_gids();
}
static int set_faked_euid(uid_t euid) {
read_effective_uid();
faked_effective_uid = euid;
read_fs_uid();
faked_fs_uid = euid;
if (write_effective_uid() < 0)
return -1;
if (write_fs_uid() < 0)
return -1;
return 0;
}
static int set_faked_egid(gid_t egid) {
read_effective_gid();
faked_effective_gid = egid;
read_fs_gid();
faked_fs_gid = egid;
if (write_effective_gid() < 0)
return -1;
if (write_fs_gid() < 0)
return -1;
return 0;
}
static int set_faked_reuid(uid_t ruid, uid_t euid) {
read_uids();
if (ruid != (uid_t)-1 || euid != (uid_t)-1)
faked_saved_uid = faked_effective_uid;
if (ruid != (uid_t)-1)
faked_real_uid = ruid;
if (euid != (uid_t)-1)
faked_effective_uid = euid;
faked_fs_uid = faked_effective_uid;
return write_uids();
}
static int set_faked_regid(gid_t rgid, gid_t egid) {
read_gids();
if (rgid != (gid_t)-1 || egid != (gid_t)-1)
faked_saved_gid = faked_effective_gid;
if (rgid != (gid_t)-1)
faked_real_gid = rgid;
if (egid != (gid_t)-1)
faked_effective_gid = egid;
faked_fs_gid = faked_effective_gid;
return write_gids();
}
#ifdef HAVE_SETRESUID
static int set_faked_resuid(uid_t ruid, uid_t euid, uid_t suid) {
read_uids();
if (ruid != (uid_t)-1)
faked_real_uid = ruid;
if (euid != (uid_t)-1)
faked_effective_uid = euid;
if (suid != (uid_t)-1)
faked_saved_uid = suid;
faked_fs_uid = faked_effective_uid;
return write_uids();
}
#endif
#ifdef HAVE_SETRESGID
static int set_faked_resgid(gid_t rgid, gid_t egid, gid_t sgid) {
read_gids();
if (rgid != (gid_t)-1)
faked_real_gid = rgid;
if (egid != (gid_t)-1)
faked_effective_gid = egid;
if (sgid != (gid_t)-1)
faked_saved_gid = sgid;
faked_fs_gid = faked_effective_gid;
return write_gids();
}
#endif
#ifdef HAVE_SETFSUID
static uid_t set_faked_fsuid(uid_t fsuid) {
uid_t prev_fsuid = get_faked_fsuid();
faked_fs_uid = fsuid;
return prev_fsuid;
}
#endif
#ifdef HAVE_SETFSGID
static gid_t set_faked_fsgid(gid_t fsgid) {
gid_t prev_fsgid = get_faked_fsgid();
faked_fs_gid = fsgid;
return prev_fsgid;
}
#endif
static int dont_try_chown(){
static int inited=0;
static int donttry;
if(!inited){
donttry=(env_var_set(FAKEROOTDONTTRYCHOWN_ENV)!=NULL);
inited=1;
}
return donttry;
}
/* The wrapped functions */
int WRAP_LSTAT LSTAT_ARG(int ver,
const char *file_name,
struct stat *statbuf){
int r;
r=NEXT_LSTAT(ver, file_name, statbuf);
if(r)
return -1;
#ifndef STUPID_ALPHA_HACK
send_get_stat(statbuf);
#else
send_get_stat(statbuf, ver);
#endif
return 0;
}
int WRAP_STAT STAT_ARG(int ver,
const char *file_name,
struct stat *st){
int r;
r=NEXT_STAT(ver, file_name, st);
if(r)
return -1;
#ifndef STUPID_ALPHA_HACK
send_get_stat(st);
#else
send_get_stat(st,ver);
#endif
return 0;
}
int WRAP_FSTAT FSTAT_ARG(int ver,
int fd,
struct stat *st){
int r;
r=NEXT_FSTAT(ver, fd, st);
if(r)
return -1;
#ifndef STUPID_ALPHA_HACK
send_get_stat(st);
#else
send_get_stat(st,ver);
#endif
return 0;
}
#ifdef HAVE_FSTATAT
int WRAP_FSTATAT FSTATAT_ARG(int ver,
int dir_fd,
const char *path,
struct stat *st,
int flags){
int r;
r=NEXT_FSTATAT(ver, dir_fd, path, st, flags);
if(r)
return -1;
#ifndef STUPID_ALPHA_HACK
send_get_stat(st);
#else
send_get_stat(st,ver);
#endif
return 0;
}
#endif /* HAVE_FSTATAT */
#ifdef STAT64_SUPPORT
int WRAP_LSTAT64 LSTAT64_ARG (int ver,
const char *file_name,
struct stat64 *st){
int r;
r=NEXT_LSTAT64(ver, file_name, st);
if(r)
return -1;
#ifndef STUPID_ALPHA_HACK
send_get_stat64(st);
#else
send_get_stat64(st,ver);
#endif
return 0;
}
int WRAP_STAT64 STAT64_ARG(int ver,
const char *file_name,
struct stat64 *st){
int r;
r=NEXT_STAT64(ver,file_name,st);
if(r)
return -1;
#ifndef STUPID_ALPHA_HACK
send_get_stat64(st);
#else
send_get_stat64(st,ver);
#endif
return 0;
}
int WRAP_FSTAT64 FSTAT64_ARG(int ver,
int fd,
struct stat64 *st){
int r;
r=NEXT_FSTAT64(ver, fd, st);
if(r)
return -1;
#ifndef STUPID_ALPHA_HACK
send_get_stat64(st);
#else
send_get_stat64(st,ver);
#endif
return 0;
}
#ifdef HAVE_FSTATAT
int WRAP_FSTATAT64 FSTATAT64_ARG(int ver,
int dir_fd,
const char *path,
struct stat64 *st,
int flags){
int r;
r=NEXT_FSTATAT64(ver, dir_fd, path, st, flags);
if(r)
return -1;
#ifndef STUPID_ALPHA_HACK
send_get_stat64(st);
#else
send_get_stat64(st,ver);
#endif
return 0;
}
#endif /* HAVE_FSTATAT */
#endif /* STAT64_SUPPORT */
/*************************************************************/
/*
Wrapped functions general info:
In general, the structure is as follows:
- Then, if the function does things that (possibly) fail by
other users than root, allow for `fake' root privileges.
Do this by obtaining the inode the function works on, and then
informing faked (the deamon that remembers all `fake' file
permissions e.d.) about the intentions of the user.
Faked maintains a list of inodes and their respective
`fake' ownerships/filemodes.
- Or, if the function requests information that we should
fake, again get the inode of the file, and ask faked about the
ownership/filemode data it maintains for that inode.
*/
/*************************************************************/
/* chown, lchown, fchown, chmod, fchmod, mknod functions
quite general. See the `Wrapped functions general info:' above
for more info.
*/
int chown(const char *path, uid_t owner, gid_t group){
INT_STRUCT_STAT st;
int r=0;
#ifdef LCHOWN_SUPPORT
/*chown(sym-link) works on the target of the symlink if lchown is
present and enabled.*/
r=INT_NEXT_STAT(_STAT_VER, path, &st);
#else
/*chown(sym-link) works on the symlink itself, use lstat: */
r=INT_NEXT_LSTAT(_STAT_VER, path, &st);
#endif
if(r)
return r;
st.st_uid=owner;
st.st_gid=group;
#ifndef STUPID_ALPHA_HACK
INT_SEND_STAT(&st,chown_func);
#else
INT_SEND_STAT(&st,chown_func, _STAT_VER);
#endif
if(!dont_try_chown())
r=next_lchown(path,owner,group);
else
r=0;
if(r&&(errno==EPERM))
r=0;
return r;
}
#ifdef LCHOWN_SUPPORT
int lchown(const char *path, uid_t owner, gid_t group){
struct stat st;
int r=0;
r=NEXT_LSTAT(_STAT_VER, path, &st);
if(r)
return r;
st.st_uid=owner;
st.st_gid=group;
#ifndef STUPID_ALPHA_HACK
send_stat(&st,chown_func);
#else
send_stat(&st,chown_func, _STAT_VER);
#endif
if(!dont_try_chown())
r=next_lchown(path,owner,group);
else
r=0;
if(r&&(errno==EPERM))
r=0;
return r;
}
#endif
int fchown(int fd, uid_t owner, gid_t group){
struct stat st;
int r;
r=NEXT_FSTAT(_STAT_VER, fd, &st);
if(r)
return r;
st.st_uid=owner;
st.st_gid=group;
#ifndef STUPID_ALPHA_HACK
send_stat(&st, chown_func);
#else
send_stat(&st, chown_func, _STAT_VER);
#endif
if(!dont_try_chown())
r=next_fchown(fd,owner,group);
else
r=0;
if(r&&(errno==EPERM))
r=0;
return r;
}
#ifdef HAVE_FSTATAT
#ifdef HAVE_FCHOWNAT
int fchownat(int dir_fd, const char *path, uid_t owner, gid_t group, int flags) {
int r;
/* If AT_SYMLINK_NOFOLLOW is set in the fchownat call it should
be when we stat it. */
#ifdef STAT64_SUPPORT
struct stat64 st;
r=NEXT_FSTATAT64(_STAT_VER, dir_fd, path, &st, (flags & AT_SYMLINK_NOFOLLOW));
#else
struct stat st;
r=NEXT_FSTATAT(_STAT_VER, dir_fd, path, &st, (flags & AT_SYMLINK_NOFOLLOW));
#endif
if(r)
return(r);
st.st_uid=owner;
st.st_gid=group;
#ifdef STAT64_SUPPORT
#ifndef STUPID_ALPHA_HACK
send_stat64(&st,chown_func);
#else
send_stat64(&st,chown_func, _STAT_VER);
#endif
#else
#ifndef STUPID_ALPHA_HACK
send_stat(&st,chown_func);
#else
send_stat(&st,chown_func, _STAT_VER);
#endif
#endif /* STAT64_SUPPORT */
if(!dont_try_chown())
r=next_fchownat(dir_fd,path,owner,group,flags);
else
r=0;
if(r&&(errno==EPERM))
r=0;
return r;
}
#endif /* HAVE_FCHOWNAT */
#endif /* HAVE_FSTATAT */
int chmod(const char *path, mode_t mode){
INT_STRUCT_STAT st;
int r;
r=INT_NEXT_STAT(_STAT_VER, path, &st);
if(r)
return r;
st.st_mode=(mode&ALLPERMS)|(st.st_mode&~ALLPERMS);
#ifndef STUPID_ALPHA_HACK
INT_SEND_STAT(&st, chmod_func);
#else
INT_SEND_STAT(&st, chmod_func, _STAT_VER);
#endif
/* if a file is unwritable, then root can still write to it
(no matter who owns the file). If we are fakeroot, the only
way to fake this is to always make the file writable, readable
etc for the real user (who started fakeroot). Also holds for
the exec bit of directories.
Yes, packages requering that are broken. But we have lintian
to get rid of broken packages, not fakeroot.
*/
mode |= 0600;
if(S_ISDIR(st.st_mode))
mode |= 0100;
r=next_chmod(path, mode);
if(r&&(errno==EPERM))
r=0;
#ifdef EFTYPE /* available under FreeBSD kernel */
if(r&&(errno==EFTYPE))
r=0;
#endif
return r;
}
int fchmod(int fd, mode_t mode){
int r;
INT_STRUCT_STAT st;
r=INT_NEXT_FSTAT(_STAT_VER, fd, &st);
if(r)
return(r);
st.st_mode=(mode&ALLPERMS)|(st.st_mode&~ALLPERMS);
#ifndef STUPID_ALPHA_HACK
INT_SEND_STAT(&st,chmod_func);
#else
INT_SEND_STAT(&st,chmod_func, _STAT_VER);
#endif
/* see chmod() for comment */
mode |= 0600;
if(S_ISDIR(st.st_mode))
mode |= 0100;
r=next_fchmod(fd, mode);
if(r&&(errno==EPERM))
r=0;
#ifdef EFTYPE /* available under FreeBSD kernel */
if(r&&(errno==EFTYPE))
r=0;
#endif
return r;
}
#ifdef HAVE_FSTATAT
#ifdef HAVE_FCHMODAT
int fchmodat(int dir_fd, const char *path, mode_t mode, int flags) {
/* (int fd, mode_t mode){*/
int r;
struct stat st;
/* If AT_SYMLINK_NOFOLLOW is set in the fchownat call it should
be when we stat it. */
r=NEXT_FSTATAT(_STAT_VER, dir_fd, path, &st, flags & AT_SYMLINK_NOFOLLOW);
if(r)
return(r);
st.st_mode=(mode&ALLPERMS)|(st.st_mode&~ALLPERMS);
#ifndef STUPID_ALPHA_HACK
send_stat(&st,chmod_func);
#else
send_stat(&st,chmod_func, _STAT_VER);
#endif
/* see chmod() for comment */
mode |= 0600;
if(S_ISDIR(st.st_mode))
mode |= 0100;
r=next_fchmodat(dir_fd, path, mode, flags);
if(r&&(errno==EPERM))
r=0;
#ifdef EFTYPE /* available under FreeBSD kernel */
if(r&&(errno==EFTYPE))
r=0;
#endif
return r;
}
#endif /* HAVE_FCHMODAT */
#endif /* HAVE_FSTATAT */
int WRAP_MKNOD MKNOD_ARG(int ver UNUSED,
const char *pathname,
mode_t mode, dev_t XMKNOD_FRTH_ARG dev)
{
struct stat st;
mode_t old_mask=umask(022);
int fd,r;
umask(old_mask);
/*Don't bother to mknod the file, that probably doesn't work.
just create it as normal file, and leave the premissions
to the fakemode.*/
fd=open(pathname, O_WRONLY|O_CREAT|O_TRUNC, 00644);
if(fd==-1)
return -1;
close(fd);
/* get the inode, to communicate with faked */
r=NEXT_LSTAT(_STAT_VER, pathname, &st);
if(r)
return -1;
st.st_mode= mode & ~old_mask;
st.st_rdev= XMKNOD_FRTH_ARG dev;
#ifndef STUPID_ALPHA_HACK
send_stat(&st,mknod_func);
#else
send_stat(&st,mknod_func, _STAT_VER);
#endif
return 0;
}
#ifdef HAVE_FSTATAT
#ifdef HAVE_MKNODAT
int WRAP_MKNODAT MKNODAT_ARG(int ver UNUSED,
int dir_fd,
const char *pathname,
mode_t mode, dev_t XMKNODAT_FIFTH_ARG dev)
{
struct stat st;
mode_t old_mask=umask(022);
int fd,r;
umask(old_mask);
/*Don't bother to mknod the file, that probably doesn't work.
just create it as normal file, and leave the permissions
to the fakemode.*/
fd=openat(dir_fd, pathname, O_WRONLY|O_CREAT|O_TRUNC, 00644);
if(fd==-1)
return -1;
close(fd);
/* get the inode, to communicate with faked */
/* The only known flag is AT_SYMLINK_NOFOLLOW and