open.c

samba-3.0.22.tar.gz 编译smb服务器的源码

		inode = fsp->inode;

		lck = get_share_mode_lock(NULL, dev, inode,
					conn->connectpath,
					fname);

		if (lck == NULL) {
			DEBUG(0, ("open_file_ntcreate: Could not get share mode lock for %s\n", fname));
			fd_close(conn, fsp);
			file_free(fsp);
			set_saved_ntstatus(NT_STATUS_SHARING_VIOLATION);
			return NULL;
		}

		status = open_mode_check(conn, fname, lck,
					 access_mask, share_access,
					 create_options, &file_existed);

		if (!NT_STATUS_IS_OK(status)) {
			struct deferred_open_record state;

			fd_close(conn, fsp);
			file_free(fsp);

			state.delayed_for_oplocks = False;
			state.dev = dev;
			state.inode = inode;

			/* Do it all over again immediately. In the second
			 * round we will find that the file existed and handle
			 * the DELETE_PENDING and FCB cases correctly. No need
			 * to duplicate the code here. Essentially this is a
			 * "goto top of this function", but don't tell
			 * anybody... */

			defer_open(lck, request_time, timeval_zero(),
				   &state);
			talloc_free(lck);
			return NULL;
		}

		/*
		 * We exit this block with the share entry *locked*.....
		 */
	}

	SMB_ASSERT(lck != NULL);

	/* note that we ignore failure for the following. It is
           basically a hack for NFS, and NFS will never set one of
           these only read them. Nobody but Samba can ever set a deny
           mode and we have already checked our more authoritative
           locking database for permission to set this deny mode. If
           the kernel refuses the operations then the kernel is wrong */

	kernel_flock(fsp, share_access);

	/*
	 * At this point onwards, we can guarentee that the share entry
	 * is locked, whether we created the file or not, and that the
	 * deny mode is compatible with all current opens.
	 */

	/*
	 * If requested, truncate the file.
	 */

	if (flags2&O_TRUNC) {
		/*
		 * We are modifing the file after open - update the stat
		 * struct..
		 */
		if ((SMB_VFS_FTRUNCATE(fsp,fsp->fh->fd,0) == -1) ||
		    (SMB_VFS_FSTAT(fsp,fsp->fh->fd,psbuf)==-1)) {
			talloc_free(lck);
			fd_close(conn,fsp);
			file_free(fsp);
			return NULL;
		}
	}

	/* Record the options we were opened with. */
	fsp->share_access = share_access;
	fsp->fh->private_options = create_options;
	fsp->access_mask = access_mask;

	if (file_existed) {
		if (!(flags2 & O_TRUNC)) {
			info = FILE_WAS_OPENED;
		} else {
			info = FILE_WAS_OVERWRITTEN;
		}
	} else {
		info = FILE_WAS_CREATED;
		/* Change the owner if required. */
		if (lp_inherit_owner(SNUM(conn))) {
			change_owner_to_parent(conn, fsp, fsp->fsp_name,
					       psbuf);
		}
	}

	if (pinfo) {
		*pinfo = info;
	}

	/* 
	 * Setup the oplock info in both the shared memory and
	 * file structs.
	 */

	if ((fsp->oplock_type != NO_OPLOCK) &&
	    (fsp->oplock_type != FAKE_LEVEL_II_OPLOCK)) {
		if (!set_file_oplock(fsp, fsp->oplock_type)) {
			/* Could not get the kernel oplock */
			fsp->oplock_type = NO_OPLOCK;
		}
	}
	set_share_mode(lck, fsp, 0, fsp->oplock_type);

	if (create_options & FILE_DELETE_ON_CLOSE) {
		uint32 dosattr= existing_dos_attributes;
		NTSTATUS result;

		if (info == FILE_WAS_OVERWRITTEN || info == FILE_WAS_CREATED ||
				info == FILE_WAS_SUPERSEDED) {
			dosattr = new_dos_attributes;
		}

		result = can_set_delete_on_close(fsp, True, dosattr);

		if (!NT_STATUS_IS_OK(result)) {
			/* Remember to delete the mode we just added. */
			del_share_mode(lck, fsp);
			talloc_free(lck);
			fd_close(conn,fsp);
			file_free(fsp);
			set_saved_ntstatus(result);
			return NULL;
		}
		lck->delete_on_close = True;
		lck->modified = True;
	}
	
	if (info == FILE_WAS_OVERWRITTEN || info == FILE_WAS_CREATED ||
				info == FILE_WAS_SUPERSEDED) {
		/* Files should be initially set as archive */
		if (lp_map_archive(SNUM(conn)) ||
		    lp_store_dos_attributes(SNUM(conn))) {
			file_set_dosmode(conn, fname,
					 new_dos_attributes | aARCH, NULL,
					 True);
		}
	}

	/*
	 * Take care of inherited ACLs on created files - if default ACL not
	 * selected.
	 */

	if (!file_existed && !def_acl) {

		int saved_errno = errno; /* We might get ENOSYS in the next
					  * call.. */

		if (SMB_VFS_FCHMOD_ACL(fsp, fsp->fh->fd, unx_mode) == -1
		    && errno == ENOSYS) {
			errno = saved_errno; /* Ignore ENOSYS */
		}

	} else if (new_unx_mode) {

		int ret = -1;

		/* Attributes need changing. File already existed. */

		{
			int saved_errno = errno; /* We might get ENOSYS in the
						  * next call.. */
			ret = SMB_VFS_FCHMOD_ACL(fsp, fsp->fh->fd,
						 new_unx_mode);

			if (ret == -1 && errno == ENOSYS) {
				errno = saved_errno; /* Ignore ENOSYS */
			} else {
				DEBUG(5, ("open_file_shared: reset "
					  "attributes of file %s to 0%o\n",
					fname, (unsigned int)new_unx_mode));
				ret = 0; /* Don't do the fchmod below. */
			}
		}

		if ((ret == -1) &&
		    (SMB_VFS_FCHMOD(fsp, fsp->fh->fd, new_unx_mode) == -1))
			DEBUG(5, ("open_file_shared: failed to reset "
				  "attributes of file %s to 0%o\n",
				fname, (unsigned int)new_unx_mode));
	}

	/* If this is a successful open, we must remove any deferred open
	 * records. */
	del_deferred_open_entry(lck, mid);
	talloc_free(lck);

	conn->num_files_open++;

	return fsp;
}

/****************************************************************************
 Open a file for for write to ensure that we can fchmod it.
****************************************************************************/

files_struct *open_file_fchmod(connection_struct *conn, const char *fname,
			       SMB_STRUCT_STAT *psbuf)
{
	files_struct *fsp = NULL;
	BOOL fsp_open;

	if (!VALID_STAT(*psbuf)) {
		return NULL;
	}

	fsp = file_new(conn);
	if(!fsp) {
		return NULL;
	}

	/* note! we must use a non-zero desired access or we don't get
           a real file descriptor. Oh what a twisted web we weave. */
	fsp_open = open_file(fsp,conn,fname,psbuf,O_WRONLY,0,FILE_WRITE_DATA);

	/* 
	 * This is not a user visible file open.
	 * Don't set a share mode and don't increment
	 * the conn->num_files_open.
	 */

	if (!fsp_open) {
		file_free(fsp);
		return NULL;
	}

	return fsp;
}

/****************************************************************************
 Close the fchmod file fd - ensure no locks are lost.
****************************************************************************/

int close_file_fchmod(files_struct *fsp)
{
	int ret = fd_close(fsp->conn, fsp);
	file_free(fsp);
	return ret;
}

/****************************************************************************
 Open a directory from an NT SMB call.
****************************************************************************/

files_struct *open_directory(connection_struct *conn,
				const char *fname,
				SMB_STRUCT_STAT *psbuf,
				uint32 access_mask,
				uint32 share_access,
				uint32 create_disposition,
				uint32 create_options,
				int *pinfo)
{
	files_struct *fsp = NULL;
	BOOL dir_existed = VALID_STAT(*psbuf) ? True : False;
	BOOL create_dir = False;
	struct share_mode_lock *lck = NULL;
	NTSTATUS status;
	int info = 0;

	DEBUG(5,("open_directory: opening directory %s, access_mask = 0x%x, "
		 "share_access = 0x%x create_options = 0x%x, "
		 "create_disposition = 0x%x\n",
		 fname,
		 (unsigned int)access_mask,
		 (unsigned int)share_access,
		 (unsigned int)create_options,
		 (unsigned int)create_disposition));

	if (is_ntfs_stream_name(fname)) {
		DEBUG(0,("open_directory: %s is a stream name!\n", fname ));
		set_saved_ntstatus(NT_STATUS_NOT_A_DIRECTORY);
		return NULL;
	}

	switch( create_disposition ) {
		case FILE_OPEN:
			/* If directory exists open. If directory doesn't
			 * exist error. */
			if (!dir_existed) {
				DEBUG(5,("open_directory: FILE_OPEN requested "
					 "for directory %s and it doesn't "
					 "exist.\n", fname ));
				set_saved_ntstatus(NT_STATUS_OBJECT_NAME_NOT_FOUND);
				return NULL;
			}
			info = FILE_WAS_OPENED;
			break;

		case FILE_CREATE:
			/* If directory exists error. If directory doesn't
			 * exist create. */
			if (dir_existed) {
				DEBUG(5,("open_directory: FILE_CREATE "
					 "requested for directory %s and it "
					 "already exists.\n", fname ));
				set_saved_error_triple(ERRDOS, ERRfilexists,
						       NT_STATUS_OBJECT_NAME_COLLISION);
				return NULL;
			}
			create_dir = True;
			info = FILE_WAS_CREATED;
			break;

		case FILE_OPEN_IF:
			/* If directory exists open. If directory doesn't
			 * exist create. */
			if (!dir_existed) {
				create_dir = True;
				info = FILE_WAS_CREATED;
			} else {
				info = FILE_WAS_OPENED;
			}
			break;

		case FILE_SUPERSEDE:
		case FILE_OVERWRITE:
		case FILE_OVERWRITE_IF:
		default:
			DEBUG(5,("open_directory: invalid create_disposition "
				 "0x%x for directory %s\n",
				 (unsigned int)create_disposition, fname));
			file_free(fsp);
			set_saved_ntstatus(NT_STATUS_INVALID_PARAMETER);
			return NULL;
	}

	if (create_dir) {
		/*
		 * Try and create the directory.
		 */

		/* We know bad_path is false as it's caught earlier. */

		status = mkdir_internal(conn, fname, False);

		if (!NT_STATUS_IS_OK(status)) {
			DEBUG(2,("open_directory: unable to create %s. "
				 "Error was %s\n", fname, strerror(errno) ));
			/* Ensure we return the correct NT status to the
			 * client. */
			set_saved_error_triple(0, 0, status);
			return NULL;
		}

		/* Ensure we're checking for a symlink here.... */
		/* We don't want to get caught by a symlink racer. */

		if(SMB_VFS_LSTAT(conn,fname, psbuf) != 0) {
			return NULL;
		}

		if(!S_ISDIR(psbuf->st_mode)) {
			DEBUG(0,("open_directory: %s is not a directory !\n",
				 fname ));
			return NULL;
		}
	}

	fsp = file_new(conn);
	if(!fsp) {
		return NULL;
	}

	/*
	 * Setup the files_struct for it.
	 */
	
	fsp->mode = psbuf->st_mode;
	fsp->inode = psbuf->st_ino;
	fsp->dev = psbuf->st_dev;
	fsp->vuid = current_user.vuid;
	fsp->file_pid = global_smbpid;
	fsp->can_lock = True;
	fsp->can_read = False;
	fsp->can_write = False;

	fsp->share_access = share_access;
	fsp->fh->private_options = create_options;
	fsp->access_mask = access_mask;

	fsp->print_file = False;
	fsp->modified = False;
	fsp->oplock_type = NO_OPLOCK;
	fsp->sent_oplock_break = NO_BREAK_SENT;
	fsp->is_directory = True;
	fsp->is_stat = False;
	string_set(&fsp->fsp_name,fname);

	lck = get_share_mode_lock(NULL, fsp->dev, fsp->inode,
				conn->connectpath,
				fname);

	if (lck == NULL) {
		DEBUG(0, ("open_directory: Could not get share mode lock for %s\n", fname));
		file_free(fsp);
		set_saved_ntstatus(NT_STATUS_SHARING_VIOLATION);
		return NULL;
	}

	status = open_mode_check(conn, fname, lck,
				access_mask, share_access,
				create_options, &dir_existed);

	if (!NT_STATUS_IS_OK(status)) {
		set_saved_ntstatus(status);
		talloc_free(lck);
		file_free(fsp);
		return NULL;
	}

	set_share_mode(lck, fsp, 0, NO_OPLOCK);

	if (create_options & FILE_DELETE_ON_CLOSE) {
		status = can_set_delete_on_close(fsp, True, 0);
		if (!NT_STATUS_IS_OK(status)) {
			set_saved_ntstatus(status);
			talloc_free(lck);
			file_free(fsp);
			return NULL;
		}

		lck->delete_on_close = True;
		lck->modified = True;
	}

	talloc_free(lck);

	/* Change the owner if required. */
	if ((info == FILE_WAS_CREATED) && lp_inherit_owner(SNUM(conn))) {
		change_owner_to_parent(conn, fsp, fsp->fsp_name, psbuf);
	}

	if (pinfo) {
		*pinfo = info;
	}

	conn->num_files_open++;

	return fsp;
}

/****************************************************************************
 Open a pseudo-file (no locking checks - a 'stat' open).
****************************************************************************/

files_struct *open_file_stat(connection_struct *conn, char *fname,
			     SMB_STRUCT_STAT *psbuf)
{
	files_struct *fsp = NULL;

	if (!VALID_STAT(*psbuf))
		return NULL;

	/* Can't 'stat' open directories. */
	if(S_ISDIR(psbuf->st_mode))
		return NULL;

	fsp = file_new(conn);
	if(!fsp)
		return NULL;

	DEBUG(5,("open_file_stat: 'opening' file %s\n", fname));

	/*
	 * Setup the files_struct for it.
	 */
	
	fsp->mode = psbuf->st_mode;
	fsp->inode = psbuf->st_ino;
	fsp->dev = psbuf->st_dev;
	fsp->vuid = current_user.vuid;
	fsp->file_pid = global_smbpid;
	fsp->can_lock = False;
	fsp->can_read = False;
	fsp->can_write = False;
	fsp->print_file = False;
	fsp->modified = False;
	fsp->oplock_type = NO_OPLOCK;
	fsp->sent_oplock_break = NO_BREAK_SENT;
	fsp->is_directory = False;
	fsp->is_stat = True;
	string_set(&fsp->fsp_name,fname);

	conn->num_files_open++;

	return fsp;
}