source: vendor/3.6.9/source3/modules/vfs_readonly.c

/*
   Unix SMB/Netbios implementation.
   Version 1.9.
   VFS module to perform read-only limitation based on a time period
   Copyright (C) Alexander Bokovoy 2003

   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 3 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, see <http://www.gnu.org/licenses/>.

   This work was sponsored by Optifacio Software Services, Inc.
*/

#include "includes.h"
#include "smbd/smbd.h"
#include "getdate.h"

/*
  This module performs a read-only limitation for specified share 
  (or all of them if it is loaded in a [global] section) based on period
  definition in smb.conf. You can stack this module multiple times under 
  different names to get multiple limit intervals.

  The module uses get_date() function from coreutils' date utility to parse
  specified dates according to date(1) rules. Look into info page for date(1)
  to understand the syntax.

  The module accepts one parameter: 

  readonly: period = "begin date","end date"

  where "begin date" and "end date" are mandatory and should comply with date(1) 
  syntax for date strings.

  Example:

  readonly: period = "today 14:00","today 15:00"

  Default:

  readonly: period = "today 0:0:0","tomorrow 0:0:0"

  The default covers whole day thus making the share readonly

 */

#define MODULE_NAME "readonly"
static int readonly_connect(vfs_handle_struct *handle, 
                            const char *service, 
                            const char *user)    
{
  const char *period_def[] = {"today 0:0:0", "tomorrow 0:0:0"};

  const char **period = lp_parm_string_list(SNUM(handle->conn),
                                             (handle->param ? handle->param : MODULE_NAME),
                                             "period", period_def); 
  int ret = SMB_VFS_NEXT_CONNECT(handle, service, user);

  if (ret < 0) {
    return ret;
  }

  if (period && period[0] && period[1]) {
    int i;
    time_t current_time = time(NULL);
    time_t begin_period = get_date(period[0], &current_time);
    time_t end_period   = get_date(period[1], &current_time);

    if ((current_time >= begin_period) && (current_time <= end_period)) {
      connection_struct *conn = handle->conn;

      handle->conn->read_only = True;

      /* Wipe out the VUID cache. */
      for (i=0; i< VUID_CACHE_SIZE; i++) {
        struct vuid_cache_entry *ent = ent = &conn->vuid_cache.array[i];
        ent->vuid = UID_FIELD_INVALID;
        TALLOC_FREE(ent->session_info);
        ent->read_only = false;
      }
      conn->vuid_cache.next_entry = 0;
    }

    return 0;

  } else {
    
    return 0;
    
  }
}


static struct vfs_fn_pointers vfs_readonly_fns = {
        .connect_fn = readonly_connect
};

NTSTATUS vfs_readonly_init(void);
NTSTATUS vfs_readonly_init(void)
{
  return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, MODULE_NAME,
                          &vfs_readonly_fns);
}