Function open_tmpfile

receiver.c:256–303

Opens a temporary file for writing. * Success: Writes name into fnametmp, returns fd. * Failure: Clobbers fnametmp, returns -1. * Calling cleanup_set() is the caller's job. */

 * Failure: Clobbers fnametmp, returns -1.
 * Calling cleanup_set() is the caller's job. */
int open_tmpfile(char *fnametmp, const char *fname, struct file_struct *file)
{
	int fd;
	mode_t added_perms;

	if (!get_tmpname(fnametmp, fname, False))
		return -1;

	if (am_root < 0) {
		/* For --fake-super, the file must be useable by the copying
		 * user, just like it would be for root. */
		added_perms = S_IRUSR|S_IWUSR;
	} else {
		/* For a normal copy, we need to be able to tweak things like xattrs. */
		added_perms = S_IWUSR;
	}

	/* We initially set the perms without the setuid/setgid bits or group
	 * access to ensure that there is no race condition.  They will be
	 * correctly updated after the right owner and group info is set.
	 * (Thanks to snabb@epipe.fi for pointing this out.) */
	/* When use_secure_symlinks is on (non-chroot daemon with munge_symlinks),
	 * use secure_mkstemp to prevent symlink race attacks on parent directories. */
	if (use_secure_symlinks)
		fd = secure_mkstemp(fnametmp, (file->mode|added_perms) & INITACCESSPERMS);
	else
		fd = do_mkstemp(fnametmp, (file->mode|added_perms) & INITACCESSPERMS);

#if 0
	/* In most cases parent directories will already exist because their
	 * information should have been previously transferred, but that may
	 * not be the case with -R */
	if (fd == -1 && relative_paths && errno == ENOENT
	 && make_path(fnametmp, MKP_SKIP_SLASH | MKP_DROP_NAME) == 0) {
		/* Get back to name with XXXXXX in it. */
		get_tmpname(fnametmp, fname, False);
		fd = do_mkstemp(fnametmp, (file->mode|added_perms) & INITACCESSPERMS);
	}
#endif

	if (fd == -1) {
		rsyserr(FERROR_XFER, errno, "mkstemp %s failed",
			full_fname(fnametmp));
		return -1;
	}

	return fd;
}

static int receive_data(int f_in, char *fname_r, int fd_r, OFF_T size_r,
			const char *fname, int fd, struct file_struct *file, int inplace_sizing)