示例#1
0
文件: logging.c 项目: ensc/dietlibc
static void openlog_intern(int option, int facility)
{
  LogStat = option;
  if (facility && ((facility & ~LOG_FACMASK) == 0))
    LogFacility = facility;

  /* yep, there is a continue inside ;) */
  while(1) {
    if (LogFile == -1) {
      SyslogAddr.sa_family = AF_UNIX;
      strncpy(SyslogAddr.sa_data, _PATH_LOG, sizeof(SyslogAddr.sa_data));
      if (LogStat & LOG_NDELAY)
      {
	if ((LogFile = socket(AF_UNIX, LogType, 0)) == -1) return;
	__libc_fcntl(LogFile, F_SETFD, 1);
      }
    }
    if ((LogFile != -1) && !connected) {
      int old_errno=errno;
      if(connect(LogFile, &SyslogAddr, sizeof(SyslogAddr)) == -1) {
	int saved_errno=errno;
	__libc_close(LogFile);
	LogFile = -1;
	if((LogType == SOCK_DGRAM) && (saved_errno == EPROTOTYPE)) {
	  /* retry with SOCK_STREAM instead of SOCK_DGRAM */
	  LogType = SOCK_STREAM;
	  errno=old_errno;
	  continue;
	}
      }
      else connected = 1;
    }
    break;
  }
}
示例#2
0
/* Duplicate FD to FD2, closing the old FD2 and making FD2 be
   open the same file as FD is.  Return FD2 or -1.  */
int
__dup2 (int fd, int fd2)
{
  /* For the degenerate case, check if the fd is valid (by trying to
     get the file status flags) and return it, or else return EBADF.  */
  if (fd == fd2)
    return __libc_fcntl (fd, F_GETFL, 0) < 0 ? -1 : fd;

  return INLINE_SYSCALL (dup3, 3, fd, fd2, 0);
}
示例#3
0
/* Should other OSes (e.g., Hurd) have different versions which can
   be written in a better way?  */
static void
check_one_fd (int fd, int mode)
{
  /* Note that fcntl() with this parameter is not a cancellation point.  */
  if (__builtin_expect (__libc_fcntl (fd, F_GETFD), 0) == -1
      && errno == EBADF)
    {
      const char *name;
      dev_t dev;

      /* For writable descriptors we use /dev/full.  */
      if ((mode & O_ACCMODE) == O_WRONLY)
	{
	  name = _PATH_DEV "full";
	  dev = makedev (DEV_FULL_MAJOR, DEV_FULL_MINOR);
	}
      else
	{
	  name = _PATH_DEVNULL;
	  dev = makedev (DEV_NULL_MAJOR, DEV_NULL_MINOR);
	}

      /* Something is wrong with this descriptor, it's probably not
	 opened.  Open /dev/null so that the SUID program we are
	 about to start does not accidently use this descriptor.  */
      int nullfd = open_not_cancel (name, mode, 0);

      /* We are very paranoid here.  With all means we try to ensure
	 that we are actually opening the /dev/null device and nothing
	 else.

	 Note that the following code assumes that STDIN_FILENO,
	 STDOUT_FILENO, STDERR_FILENO are the three lowest file
	 decsriptor numbers, in this order.  */
      struct stat64 st;
      if (__builtin_expect (nullfd != fd, 0)
	  || __builtin_expect (__fxstat64 (_STAT_VER, fd, &st), 0) != 0
	  || __builtin_expect (S_ISCHR (st.st_mode), 1) == 0
	  || st.st_rdev != dev)
	/* We cannot even give an error message here since it would
	   run into the same problems.  */
	while (1)
	  /* Try for ever and ever.  */
	  ABORT_INSTRUCTION;
    }
}
示例#4
0
/* Change the ownership and access permission of the slave pseudo
   terminal associated with the master pseudo terminal specified
   by FD.  */
int
grantpt (int fd)
{
  struct statfs fsbuf;
#ifdef PATH_MAX
  char _buf[PATH_MAX];
#else
  char _buf[512];
#endif
  char *buf = _buf;

  if (__builtin_expect (pts_name (fd, &buf, sizeof (_buf)), 0))
    {
      int save_errno = errno;

      /* Check, if the file descriptor is valid. pts_name returns the
	 wrong errno number, so we cannot use that.  */
      if (__libc_fcntl (fd, F_GETFD) == -1 && errno == EBADF)
	return -1;

       /* If the filedescriptor is no TTY, grantpt has to set errno
          to EINVAL.  */
       if (save_errno == ENOTTY)
         __set_errno (EINVAL);
       else
	 __set_errno (save_errno);

       return -1;
    }

  if (__statfs (buf, &fsbuf) < 0)
    return -1;

  /* If the slave pseudo terminal lives on a `devpts' filesystem, the
     ownership and access permission are already set.  */
  if (fsbuf.f_type == DEVPTS_SUPER_MAGIC || fsbuf.f_type == DEVFS_SUPER_MAGIC)
    return 0;

  return __unix_grantpt (fd);
}
示例#5
0
/* Change the ownership and access permission of the slave pseudo
   terminal associated with the master pseudo terminal specified
   by FD.  */
int
grantpt (int fd)
{
  int retval = -1;
#ifdef PATH_MAX
  char _buf[PATH_MAX];
#else
  char _buf[512];
#endif
  char *buf = _buf;
  struct stat64 st;

  if (__glibc_unlikely (pts_name (fd, &buf, sizeof (_buf), &st)))
    {
      int save_errno = errno;

      /* Check, if the file descriptor is valid.  pts_name returns the
	 wrong errno number, so we cannot use that.  */
      if (__libc_fcntl (fd, F_GETFD) == -1 && errno == EBADF)
	return -1;

       /* If the filedescriptor is no TTY, grantpt has to set errno
	  to EINVAL.  */
       if (save_errno == ENOTTY)
	 __set_errno (EINVAL);
       else
	 __set_errno (save_errno);

       return -1;
    }

  /* Make sure that we own the device.  */
  uid_t uid = __getuid ();
  if (st.st_uid != uid)
    {
      if (__chown (buf, uid, st.st_gid) < 0)
	goto helper;
    }

  static int tty_gid = -1;
  if (__glibc_unlikely (tty_gid == -1))
    {
      char *grtmpbuf;
      struct group grbuf;
      size_t grbuflen = __sysconf (_SC_GETGR_R_SIZE_MAX);
      struct group *p;

      /* Get the group ID of the special `tty' group.  */
      if (grbuflen == (size_t) -1L)
	/* `sysconf' does not support _SC_GETGR_R_SIZE_MAX.
	   Try a moderate value.  */
	grbuflen = 1024;
      grtmpbuf = (char *) __alloca (grbuflen);
      __getgrnam_r (TTY_GROUP, &grbuf, grtmpbuf, grbuflen, &p);
      if (p != NULL)
	tty_gid = p->gr_gid;
    }
  gid_t gid = tty_gid == -1 ? __getgid () : tty_gid;

  /* Make sure the group of the device is that special group.  */
  if (st.st_gid != gid)
    {
      if (__chown (buf, uid, gid) < 0)
	goto helper;
    }

  /* Make sure the permission mode is set to readable and writable by
     the owner, and writable by the group.  */
  if ((st.st_mode & ACCESSPERMS) != (S_IRUSR|S_IWUSR|S_IWGRP))
    {
      if (__chmod (buf, S_IRUSR|S_IWUSR|S_IWGRP) < 0)
	goto helper;
    }

  retval = 0;
  goto cleanup;

  /* We have to use the helper program if it is available.  */
 helper:;

#ifdef HAVE_PT_CHOWN
  pid_t pid = __fork ();
  if (pid == -1)
    goto cleanup;
  else if (pid == 0)
    {
      /* Disable core dumps.  */
      struct rlimit rl = { 0, 0 };
      __setrlimit (RLIMIT_CORE, &rl);

      /* We pass the master pseudo terminal as file descriptor PTY_FILENO.  */
      if (fd != PTY_FILENO)
	if (__dup2 (fd, PTY_FILENO) < 0)
	  _exit (FAIL_EBADF);

# ifdef CLOSE_ALL_FDS
      CLOSE_ALL_FDS ();
# endif

      execle (_PATH_PT_CHOWN, basename (_PATH_PT_CHOWN), NULL, NULL);
      _exit (FAIL_EXEC);
    }
  else
    {
      int w;

      if (__waitpid (pid, &w, 0) == -1)
	goto cleanup;
      if (!WIFEXITED (w))
	__set_errno (ENOEXEC);
      else
	switch (WEXITSTATUS (w))
	  {
	  case 0:
	    retval = 0;
	    break;
	  case FAIL_EBADF:
	    __set_errno (EBADF);
	    break;
	  case FAIL_EINVAL:
	    __set_errno (EINVAL);
	    break;
	  case FAIL_EACCES:
	    __set_errno (EACCES);
	    break;
	  case FAIL_EXEC:
	    __set_errno (ENOEXEC);
	    break;
	  case FAIL_ENOMEM:
	    __set_errno (ENOMEM);
	    break;

	  default:
	    assert(! "getpt: internal error: invalid exit code from pt_chown");
	  }
    }
#endif

 cleanup:
  if (buf != _buf)
    free (buf);

  return retval;
}