samba-mirror/source3/smbd/close.c

/* 
   Unix SMB/CIFS implementation.
   file closing
   Copyright (C) Andrew Tridgell 1992-1998
   Copyright (C) Jeremy Allison 1992-2004.
   Copyright (C) Volker Lendecke 2005
   
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.
   
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
   
   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

#include "includes.h"

/****************************************************************************
 Run a file if it is a magic script.
****************************************************************************/

static void check_magic(files_struct *fsp,connection_struct *conn)
{
	if (!*lp_magicscript(SNUM(conn)))
		return;

	DEBUG(5,("checking magic for %s\n",fsp->fsp_name));

	{
		char *p;
		if (!(p = strrchr_m(fsp->fsp_name,'/')))
			p = fsp->fsp_name;
		else
			p++;

		if (!strequal(lp_magicscript(SNUM(conn)),p))
			return;
	}

	{
		int ret;
		pstring magic_output;
		pstring fname;
		SMB_STRUCT_STAT st;
		int tmp_fd, outfd;

		pstrcpy(fname,fsp->fsp_name);
		if (*lp_magicoutput(SNUM(conn)))
			pstrcpy(magic_output,lp_magicoutput(SNUM(conn)));
		else
			slprintf(magic_output,sizeof(fname)-1, "%s.out",fname);

		chmod(fname,0755);
		ret = smbrun(fname,&tmp_fd);
		DEBUG(3,("Invoking magic command %s gave %d\n",fname,ret));
		unlink(fname);
		if (ret != 0 || tmp_fd == -1) {
			if (tmp_fd != -1)
				close(tmp_fd);
			return;
		}
		outfd = open(magic_output, O_CREAT|O_EXCL|O_RDWR, 0600);
		if (outfd == -1) {
			close(tmp_fd);
			return;
		}

		if (sys_fstat(tmp_fd,&st) == -1) {
			close(tmp_fd);
			close(outfd);
			return;
		}

		transfer_file(tmp_fd,outfd,(SMB_OFF_T)st.st_size);
		close(tmp_fd);
		close(outfd);
	}
}

/****************************************************************************
  Common code to close a file or a directory.
****************************************************************************/

static int close_filestruct(files_struct *fsp)
{   
	connection_struct *conn = fsp->conn;
	int ret = 0;
    
	if (fsp->fh->fd != -1) {
		if(flush_write_cache(fsp, CLOSE_FLUSH) == -1)
			ret = -1;

		delete_write_cache(fsp);
	}

	conn->num_files_open--;
	SAFE_FREE(fsp->wbmpx_ptr);

	return ret;
}    

/****************************************************************************
 If any deferred opens are waiting on this close, notify them.
****************************************************************************/

static void notify_deferred_opens(struct share_mode_lock *lck)
{
 	int i;
 
 	for (i=0; i<lck->num_share_modes; i++) {
 		struct share_mode_entry *e = &lck->share_modes[i];
 
 		if (!is_deferred_open_entry(e)) {
 			continue;
 		}
 
 		if (procid_is_me(&e->pid)) {
 			/*
 			 * We need to notify ourself to retry the open.  Do
 			 * this by finding the queued SMB record, moving it to
 			 * the head of the queue and changing the wait time to
 			 * zero.
 			 */
 			schedule_deferred_open_smb_message(e->op_mid);
 		} else {
			char msg[MSG_SMB_SHARE_MODE_ENTRY_SIZE];

			share_mode_entry_to_message(msg, e);

			become_root();
 			message_send_pid(e->pid, MSG_SMB_OPEN_RETRY,
 					 msg, MSG_SMB_SHARE_MODE_ENTRY_SIZE, True);
			unbecome_root();
 		}
 	}
}

/****************************************************************************
 Close a file.

 close_type can be NORMAL_CLOSE=0,SHUTDOWN_CLOSE,ERROR_CLOSE.
 printing and magic scripts are only run on normal close.
 delete on close is done on normal and shutdown close.
****************************************************************************/

static int close_normal_file(files_struct *fsp, enum file_close_type close_type)
{
	BOOL delete_file = False;
	connection_struct *conn = fsp->conn;
	int saved_errno = 0;
	int err = 0;
	int err1 = 0;
	struct share_mode_lock *lck;

	remove_pending_lock_requests_by_fid(fsp);

	if (fsp->aio_write_behind) {
		/*
	 	 * If we're finishing write behind on a close we can get a write
		 * error here, we must remember this.
		 */
		int ret = wait_for_aio_completion(fsp);
		if (ret) {
			saved_errno = ret;
			err1 = -1;
		}
	} else {
		cancel_aio_by_fsp(fsp);
	}
 
	/*
	 * If we're flushing on a close we can get a write
	 * error here, we must remember this.
	 */

	if (close_filestruct(fsp) == -1) {
		saved_errno = errno;
		err1 = -1;
	}

	if (fsp->print_file) {
		print_fsp_end(fsp, close_type);
		file_free(fsp);
		return 0;
	}

	/*
	 * Lock the share entries, and determine if we should delete
	 * on close. If so delete whilst the lock is still in effect.
	 * This prevents race conditions with the file being created. JRA.
	 */

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

	if (lck == NULL) {
		DEBUG(0, ("close_file: Could not get share mode lock for file %s\n", fsp->fsp_name));
		return EINVAL;
	}

	if (!del_share_mode(lck, fsp)) {
		DEBUG(0, ("close_file: Could not delete share entry for file %s\n", fsp->fsp_name));
	}

	delete_file = (lck->delete_on_close | lck->initial_delete_on_close);

	if (delete_file) {
		int i;
		/* See if others still have the file open. If this is the
		 * case, then don't delete */
		for (i=0; i<lck->num_share_modes; i++) {
			if (is_valid_share_mode_entry(&lck->share_modes[i])) {
				delete_file = False;
				break;
			}
		}
	}

	/* Notify any deferred opens waiting on this close. */
	notify_deferred_opens(lck);
	reply_to_oplock_break_requests(fsp);

	/*
	 * NT can set delete_on_close of the last open
	 * reference to a file.
	 */

	if ((close_type == NORMAL_CLOSE || close_type == SHUTDOWN_CLOSE) &&
				delete_file &&
				lck->delete_token) {
		SMB_STRUCT_STAT sbuf;

		DEBUG(5,("close_file: file %s. Delete on close was set - deleting file.\n",
			fsp->fsp_name));

		/* Become the user who requested the delete. */

		if (!push_sec_ctx()) {
			smb_panic("close_file: file %s. failed to push sec_ctx.\n");
		}

		set_sec_ctx(lck->delete_token->uid,
				lck->delete_token->gid,
				lck->delete_token->ngroups,
				lck->delete_token->groups,
				NULL);

		/* We can only delete the file if the name we have
		   is still valid and hasn't been renamed. */

		if(SMB_VFS_STAT(conn,fsp->fsp_name,&sbuf) != 0) {
			DEBUG(5,("close_file: file %s. Delete on close was set "
				"and stat failed with error %s\n",
				fsp->fsp_name, strerror(errno) ));
		} else {
			if(sbuf.st_dev != fsp->dev || sbuf.st_ino != fsp->inode) {
				DEBUG(5,("close_file: file %s. Delete on close was set and "
					"dev and/or inode does not match\n",
					fsp->fsp_name ));
				DEBUG(5,("close_file: file %s. stored dev = %x, inode = %.0f "
					"stat dev = %x, inode = %.0f\n",
					fsp->fsp_name,
					(unsigned int)fsp->dev, (double)fsp->inode,
					(unsigned int)sbuf.st_dev, (double)sbuf.st_ino ));

			} else if(SMB_VFS_UNLINK(conn,fsp->fsp_name) != 0) {
				/*
				 * This call can potentially fail as another smbd may have
				 * had the file open with delete on close set and deleted
				 * it when its last reference to this file went away. Hence
				 * we log this but not at debug level zero.
				 */

				DEBUG(5,("close_file: file %s. Delete on close was set "
					"and unlink failed with error %s\n",
					fsp->fsp_name, strerror(errno) ));
			}
		}
		/* unbecome user. */
		pop_sec_ctx();

		process_pending_change_notify_queue((time_t)0);
	}

	TALLOC_FREE(lck);

	if(fsp->oplock_type)
		release_file_oplock(fsp);

	locking_close_file(fsp);

	err = fd_close(conn, fsp);

	/* Only save errno if fd_close failed and we don't already
	   have an errno saved from a flush call. */
	if ((err1 != -1) && (err == -1)) {
		saved_errno = errno;
	}

	/* check for magic scripts */
	if (close_type == NORMAL_CLOSE) {
		check_magic(fsp,conn);
	}

	/*
	 * Ensure pending modtime is set after close.
	 */

	if(fsp->pending_modtime && fsp->pending_modtime_owner) {
		set_filetime(conn, fsp->fsp_name, fsp->pending_modtime);
	} else if (fsp->last_write_time) {
		set_filetime(conn, fsp->fsp_name, fsp->last_write_time);
	}

	DEBUG(2,("%s closed file %s (numopen=%d) %s\n",
		conn->user,fsp->fsp_name,
		conn->num_files_open,
		(err == -1 || err1 == -1) ? strerror(saved_errno) : ""));

	if (fsp->fsp_name)
		string_free(&fsp->fsp_name);

	file_free(fsp);

	if (err == -1 || err1 == -1) {
		errno = saved_errno;
		return saved_errno;
	} else {
		return 0;
	}
}

/****************************************************************************
 Close a directory opened by an NT SMB call. 
****************************************************************************/
  
static int close_directory(files_struct *fsp, enum file_close_type close_type)
{
	struct share_mode_lock *lck = 0;
	BOOL delete_dir = False;

	/*
	 * NT can set delete_on_close of the last open
	 * reference to a directory also.
	 */

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

	if (lck == NULL) {
		DEBUG(0, ("close_directory: Could not get share mode lock for %s\n", fsp->fsp_name));
		return EINVAL;
	}

	if (!del_share_mode(lck, fsp)) {
		DEBUG(0, ("close_directory: Could not delete share entry for %s\n", fsp->fsp_name));
	}

	delete_dir = (lck->delete_on_close | lck->initial_delete_on_close);

	if ((close_type == NORMAL_CLOSE || close_type == SHUTDOWN_CLOSE) &&
				delete_dir &&
				lck->delete_token) {
		BOOL ok;
	
		/* Become the user who requested the delete. */

		if (!push_sec_ctx()) {
			smb_panic("close_directory: failed to push sec_ctx.\n");
		}

		set_sec_ctx(lck->delete_token->uid,
				lck->delete_token->gid,
				lck->delete_token->ngroups,
				lck->delete_token->groups,
				NULL);

		TALLOC_FREE(lck);

		ok = rmdir_internals(fsp->conn, fsp->fsp_name);

		DEBUG(5,("close_directory: %s. Delete on close was set - deleting directory %s.\n",
			fsp->fsp_name, ok ? "succeeded" : "failed" ));

		/* unbecome user. */
		pop_sec_ctx();

		/*
		 * Ensure we remove any change notify requests that would
		 * now fail as the directory has been deleted.
		 */

		if(ok) {
			remove_pending_change_notify_requests_by_fid(fsp, NT_STATUS_DELETE_PENDING);
			remove_pending_change_notify_requests_by_filename(fsp, NT_STATUS_DELETE_PENDING);

		}
		process_pending_change_notify_queue((time_t)0);
	} else {
		TALLOC_FREE(lck);
		remove_pending_change_notify_requests_by_fid(fsp, NT_STATUS_CANCELLED);
	}

	/*
	 * Do the code common to files and directories.
	 */
	close_filestruct(fsp);
	
	if (fsp->fsp_name) {
		string_free(&fsp->fsp_name);
	}
	
	file_free(fsp);
	return 0;
}

/****************************************************************************
 Close a 'stat file' opened internally.
****************************************************************************/
  
static int close_stat(files_struct *fsp)
{
	/*
	 * Do the code common to files and directories.
	 */
	close_filestruct(fsp);
	
	if (fsp->fsp_name)
		string_free(&fsp->fsp_name);
	
	file_free(fsp);
	return 0;
}

/****************************************************************************
 Close a files_struct.
****************************************************************************/
  
int close_file(files_struct *fsp, enum file_close_type close_type)
{
	if(fsp->is_directory)
		return close_directory(fsp, close_type);
	else if (fsp->is_stat)
		return close_stat(fsp);
	else
		return close_normal_file(fsp, close_type);
}